_ Git - rust-lightning/blob - src/ln/channel.rs

   1 use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::script::{Script,Builder};
   3 use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
   4 use bitcoin::blockdata::opcodes;
   5 use bitcoin::util::hash::{Sha256dHash, Hash160};
   6 use bitcoin::util::bip143;
   7 use bitcoin::network::serialize::BitcoinHash;
   8
   9 use secp256k1::key::{PublicKey,SecretKey};
  10 use secp256k1::{Secp256k1,Message,Signature};
  11 use secp256k1;
  12
  13 use crypto::digest::Digest;
  14 use crypto::hkdf::{hkdf_extract,hkdf_expand};
  15
  16 use ln::msgs;
  17 use ln::msgs::{ErrorAction, HandleError, RAACommitmentOrder};
  18 use ln::channelmonitor::ChannelMonitor;
  19 use ln::channelmanager::{PendingHTLCStatus, HTLCSource, PendingForwardHTLCInfo, HTLCFailReason, HTLCFailureMsg};
  20 use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment,HTLC_SUCCESS_TX_WEIGHT,HTLC_TIMEOUT_TX_WEIGHT};
  21 use ln::chan_utils;
  22 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
  23 use chain::transaction::OutPoint;
  24 use util::{transaction_utils,rng};
  25 use util::ser::Writeable;
  26 use util::sha2::Sha256;
  27 use util::logger::Logger;
  28 use util::errors::APIError;
  29
  30 use std;
  31 use std::default::Default;
  32 use std::{cmp,mem};
  33 use std::time::Instant;
  34 use std::sync::{Arc};
  35
  36 pub struct ChannelKeys {
  37         pub funding_key: SecretKey,
  38         pub revocation_base_key: SecretKey,
  39         pub payment_base_key: SecretKey,
  40         pub delayed_payment_base_key: SecretKey,
  41         pub htlc_base_key: SecretKey,
  42         pub channel_close_key: SecretKey,
  43         pub channel_monitor_claim_key: SecretKey,
  44         pub commitment_seed: [u8; 32],
  45 }
  46
  47 #[cfg(test)]
  48 pub struct ChannelValueStat {
  49         pub value_to_self_msat: u64,
  50         pub channel_value_msat: u64,
  51         pub channel_reserve_msat: u64,
  52         pub pending_outbound_htlcs_amount_msat: u64,
  53         pub pending_inbound_htlcs_amount_msat: u64,
  54         pub holding_cell_outbound_amount_msat: u64,
  55         pub their_max_htlc_value_in_flight_msat: u64, // outgoing
  56 }
  57
  58 impl ChannelKeys {
  59         pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
  60                 let mut prk = [0; 32];
  61                 hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
  62                 let secp_ctx = Secp256k1::without_caps();
  63
  64                 let mut okm = [0; 32];
  65                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
  66                 let funding_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  67
  68                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning revocation base key info", &mut okm);
  69                 let revocation_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  70
  71                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning payment base key info", &mut okm);
  72                 let payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  73
  74                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning delayed payment base key info", &mut okm);
  75                 let delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  76
  77                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
  78                 let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  79
  80                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
  81                 let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  82
  83                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
  84                 let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  85
  86                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
  87
  88                 Ok(ChannelKeys {
  89                         funding_key: funding_key,
  90                         revocation_base_key: revocation_base_key,
  91                         payment_base_key: payment_base_key,
  92                         delayed_payment_base_key: delayed_payment_base_key,
  93                         htlc_base_key: htlc_base_key,
  94                         channel_close_key: channel_close_key,
  95                         channel_monitor_claim_key: channel_monitor_claim_key,
  96                         commitment_seed: okm
  97                 })
  98         }
  99 }
 100
 101 enum InboundHTLCRemovalReason {
 102         FailRelay(msgs::OnionErrorPacket),
 103         FailMalformed(([u8; 32], u16)),
 104         Fulfill([u8; 32]),
 105 }
 106
 107 enum InboundHTLCState {
 108         /// Added by remote, to be included in next local commitment tx.
 109         RemoteAnnounced(PendingHTLCStatus),
 110         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
 111         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 112         /// accept this HTLC. Implies AwaitingRemoteRevoke.
 113         /// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
 114         /// a remote revoke_and_ack on a previous state before we can do so.
 115         AwaitingRemoteRevokeToAnnounce(PendingHTLCStatus),
 116         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
 117         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 118         /// accept this HTLC. Implies AwaitingRemoteRevoke.
 119         /// We have included this HTLC in our latest commitment_signed and are now just waiting on a
 120         /// revoke_and_ack.
 121         AwaitingAnnouncedRemoteRevoke(PendingHTLCStatus),
 122         Committed,
 123         /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
 124         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
 125         /// we'll drop it.
 126         /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
 127         /// commitment transaction without it as otherwise we'll have to force-close the channel to
 128         /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
 129         /// anyway). That said, ChannelMonitor does this for us (see
 130         /// ChannelMonitor::would_broadcast_at_height) so we actually remove the HTLC from our own
 131         /// local state before then, once we're sure that the next commitment_signed and
 132         /// ChannelMonitor::provide_latest_local_commitment_tx_info will not include this HTLC.
 133         LocalRemoved(InboundHTLCRemovalReason),
 134 }
 135
 136 struct InboundHTLCOutput {
 137         htlc_id: u64,
 138         amount_msat: u64,
 139         cltv_expiry: u32,
 140         payment_hash: [u8; 32],
 141         state: InboundHTLCState,
 142 }
 143
 144 enum OutboundHTLCState {
 145         /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
 146         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
 147         /// we will promote to Committed (note that they may not accept it until the next time we
 148         /// revoke, but we dont really care about that:
 149         ///  * they've revoked, so worst case we can announce an old state and get our (option on)
 150         ///    money back (though we wont), and,
 151         ///  * we'll send them a revoke when they send a commitment_signed, and since only they're
 152         ///    allowed to remove it, the "can only be removed once committed on both sides" requirement
 153         ///    doesn't matter to us and its up to them to enforce it, worst-case they jump ahead but
 154         ///    we'll never get out of sync).
 155         /// Note that we Box the OnionPacket as its rather large and we don't want to blow up
 156         /// OutboundHTLCOutput's size just for a temporary bit
 157         LocalAnnounced(Box<msgs::OnionPacket>),
 158         Committed,
 159         /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
 160         /// the change (though they'll need to revoke before we fail the payment).
 161         RemoteRemoved,
 162         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
 163         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 164         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
 165         /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
 166         /// remote revoke_and_ack on a previous state before we can do so.
 167         AwaitingRemoteRevokeToRemove,
 168         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
 169         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 170         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
 171         /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
 172         /// revoke_and_ack to drop completely.
 173         AwaitingRemovedRemoteRevoke,
 174 }
 175
 176 struct OutboundHTLCOutput {
 177         htlc_id: u64,
 178         amount_msat: u64,
 179         cltv_expiry: u32,
 180         payment_hash: [u8; 32],
 181         state: OutboundHTLCState,
 182         source: HTLCSource,
 183         /// If we're in a removed state, set if they failed, otherwise None
 184         fail_reason: Option<HTLCFailReason>,
 185 }
 186
 187 macro_rules! get_htlc_in_commitment {
 188         ($htlc: expr, $offered: expr) => {
 189                 HTLCOutputInCommitment {
 190                         offered: $offered,
 191                         amount_msat: $htlc.amount_msat,
 192                         cltv_expiry: $htlc.cltv_expiry,
 193                         payment_hash: $htlc.payment_hash,
 194                         transaction_output_index: 0
 195                 }
 196         }
 197 }
 198
 199 /// See AwaitingRemoteRevoke ChannelState for more info
 200 enum HTLCUpdateAwaitingACK {
 201         AddHTLC {
 202                 // always outbound
 203                 amount_msat: u64,
 204                 cltv_expiry: u32,
 205                 payment_hash: [u8; 32],
 206                 source: HTLCSource,
 207                 onion_routing_packet: msgs::OnionPacket,
 208                 time_created: Instant, //TODO: Some kind of timeout thing-a-majig
 209         },
 210         ClaimHTLC {
 211                 payment_preimage: [u8; 32],
 212                 htlc_id: u64,
 213         },
 214         FailHTLC {
 215                 htlc_id: u64,
 216                 err_packet: msgs::OnionErrorPacket,
 217         },
 218 }
 219
 220 /// There are a few "states" and then a number of flags which can be applied:
 221 /// We first move through init with OurInitSent -> TheirInitSent -> FundingCreated -> FundingSent.
 222 /// TheirFundingLocked and OurFundingLocked then get set on FundingSent, and when both are set we
 223 /// move on to ChannelFunded.
 224 /// Note that PeerDisconnected can be set on both ChannelFunded and FundingSent.
 225 /// ChannelFunded can then get all remaining flags set on it, until we finish shutdown, then we
 226 /// move on to ShutdownComplete, at which point most calls into this channel are disallowed.
 227 enum ChannelState {
 228         /// Implies we have (or are prepared to) send our open_channel/accept_channel message
 229         OurInitSent = (1 << 0),
 230         /// Implies we have received their open_channel/accept_channel message
 231         TheirInitSent = (1 << 1),
 232         /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
 233         /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
 234         /// upon receipt of funding_created, so simply skip this state.
 235         FundingCreated = 4,
 236         /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
 237         /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
 238         /// and our counterparty consider the funding transaction confirmed.
 239         FundingSent = 8,
 240         /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
 241         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
 242         TheirFundingLocked = (1 << 4),
 243         /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
 244         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
 245         OurFundingLocked = (1 << 5),
 246         ChannelFunded = 64,
 247         /// Flag which is set on ChannelFunded and FundingSent indicating remote side is considered
 248         /// "disconnected" and no updates are allowed until after we've done a channel_reestablish
 249         /// dance.
 250         PeerDisconnected = (1 << 7),
 251         /// Flag which is set on ChannelFunded and FundingSent indicating the user has told us they
 252         /// failed to update our ChannelMonitor somewhere and we should pause sending any outbound
 253         /// messages until they've managed to do so.
 254         MonitorUpdateFailed = (1 << 8),
 255         /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
 256         /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
 257         /// messages as then we will be unable to determine which HTLCs they included in their
 258         /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
 259         /// later.
 260         /// Flag is set on ChannelFunded.
 261         AwaitingRemoteRevoke = (1 << 9),
 262         /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
 263         /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
 264         /// to respond with our own shutdown message when possible.
 265         RemoteShutdownSent = (1 << 10),
 266         /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
 267         /// point, we may not add any new HTLCs to the channel.
 268         /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
 269         /// us their shutdown.
 270         LocalShutdownSent = (1 << 11),
 271         /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
 272         /// to drop us, but we store this anyway.
 273         ShutdownComplete = 4096,
 274 }
 275 const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
 276 const MULTI_STATE_FLAGS: u32 = (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32);
 277
 278 const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
 279
 280 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
 281 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
 282 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
 283 // inbound channel.
 284 pub(super) struct Channel {
 285         user_id: u64,
 286
 287         channel_id: [u8; 32],
 288         channel_state: u32,
 289         channel_outbound: bool,
 290         secp_ctx: Secp256k1<secp256k1::All>,
 291         announce_publicly: bool,
 292         channel_value_satoshis: u64,
 293
 294         local_keys: ChannelKeys,
 295
 296         // Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
 297         // generation start at 0 and count up...this simplifies some parts of implementation at the
 298         // cost of others, but should really just be changed.
 299
 300         cur_local_commitment_transaction_number: u64,
 301         cur_remote_commitment_transaction_number: u64,
 302         value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
 303         /// Upon receipt of a channel_reestablish we have to figure out whether to send a
 304         /// revoke_and_ack first or a commitment update first. Generally, we prefer to send
 305         /// revoke_and_ack first, but if we had a pending commitment update of our own waiting on a
 306         /// remote revoke when we received the latest commitment update from the remote we have to make
 307         /// sure that commitment update gets resent first.
 308         received_commitment_while_awaiting_raa: bool,
 309         pending_inbound_htlcs: Vec<InboundHTLCOutput>,
 310         pending_outbound_htlcs: Vec<OutboundHTLCOutput>,
 311         holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
 312
 313         monitor_pending_revoke_and_ack: bool,
 314         monitor_pending_commitment_signed: bool,
 315         monitor_pending_order: Option<RAACommitmentOrder>,
 316         monitor_pending_forwards: Vec<(PendingForwardHTLCInfo, u64)>,
 317         monitor_pending_failures: Vec<(HTLCSource, [u8; 32], HTLCFailReason)>,
 318
 319         // pending_update_fee is filled when sending and receiving update_fee
 320         // For outbound channel, feerate_per_kw is updated with the value from
 321         // pending_update_fee when revoke_and_ack is received
 322         //
 323         // For inbound channel, feerate_per_kw is updated when it receives
 324         // commitment_signed and revoke_and_ack is generated
 325         // The pending value is kept when another pair of update_fee and commitment_signed
 326         // is received during AwaitingRemoteRevoke and relieved when the expected
 327         // revoke_and_ack is received and new commitment_signed is generated to be
 328         // sent to the funder. Otherwise, the pending value is removed when receiving
 329         // commitment_signed.
 330         pending_update_fee: Option<u64>,
 331         // update_fee() during ChannelState::AwaitingRemoteRevoke is hold in
 332         // holdina_cell_update_fee then moved to pending_udpate_fee when revoke_and_ack
 333         // is received. holding_cell_update_fee is updated when there are additional
 334         // update_fee() during ChannelState::AwaitingRemoteRevoke.
 335         holding_cell_update_fee: Option<u64>,
 336         next_local_htlc_id: u64,
 337         next_remote_htlc_id: u64,
 338         channel_update_count: u32,
 339         feerate_per_kw: u64,
 340
 341         #[cfg(debug_assertions)]
 342         /// Max to_local and to_remote outputs in a locally-generated commitment transaction
 343         max_commitment_tx_output_local: ::std::sync::Mutex<(u64, u64)>,
 344         #[cfg(debug_assertions)]
 345         /// Max to_local and to_remote outputs in a remote-generated commitment transaction
 346         max_commitment_tx_output_remote: ::std::sync::Mutex<(u64, u64)>,
 347
 348         #[cfg(test)]
 349         // Used in ChannelManager's tests to send a revoked transaction
 350         pub last_local_commitment_txn: Vec<Transaction>,
 351         #[cfg(not(test))]
 352         last_local_commitment_txn: Vec<Transaction>,
 353
 354         last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
 355
 356         /// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
 357         /// to detect unconfirmation after a serialize-unserialize roudtrip where we may not see a full
 358         /// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
 359         /// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
 360         funding_tx_confirmed_in: Option<Sha256dHash>,
 361         short_channel_id: Option<u64>,
 362         /// Used to deduplicate block_connected callbacks
 363         last_block_connected: Sha256dHash,
 364         funding_tx_confirmations: u64,
 365
 366         their_dust_limit_satoshis: u64,
 367         our_dust_limit_satoshis: u64,
 368         their_max_htlc_value_in_flight_msat: u64,
 369         //get_our_max_htlc_value_in_flight_msat(): u64,
 370         /// minimum channel reserve for **self** to maintain - set by them.
 371         their_channel_reserve_satoshis: u64,
 372         //get_our_channel_reserve_satoshis(): u64,
 373         their_htlc_minimum_msat: u64,
 374         our_htlc_minimum_msat: u64,
 375         their_to_self_delay: u16,
 376         //implied by BREAKDOWN_TIMEOUT: our_to_self_delay: u16,
 377         their_max_accepted_htlcs: u16,
 378         //implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
 379
 380         their_funding_pubkey: Option<PublicKey>,
 381         their_revocation_basepoint: Option<PublicKey>,
 382         their_payment_basepoint: Option<PublicKey>,
 383         their_delayed_payment_basepoint: Option<PublicKey>,
 384         their_htlc_basepoint: Option<PublicKey>,
 385         their_cur_commitment_point: Option<PublicKey>,
 386
 387         their_prev_commitment_point: Option<PublicKey>,
 388         their_node_id: PublicKey,
 389
 390         their_shutdown_scriptpubkey: Option<Script>,
 391
 392         channel_monitor: ChannelMonitor,
 393
 394         logger: Arc<Logger>,
 395 }
 396
 397 const OUR_MAX_HTLCS: u16 = 5; //TODO
 398 /// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
 399 /// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
 400 /// really allow for this, so instead we're stuck closing it out at that point.
 401 const UNCONF_THRESHOLD: u32 = 6;
 402 /// The amount of time we require our counterparty wait to claim their money (ie time between when
 403 /// we, or our watchtower, must check for them having broadcast a theft transaction).
 404 const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
 405 /// The amount of time we're willing to wait to claim money back to us
 406 const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
 407 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
 408 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
 409 const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
 410 const B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT: u64 = 104; // prevout: 40, nSequence: 4, script len: 1, witness lengths: 3/4, sig: 73/4, pubkey: 33/4, output: 31 (TODO: Wrong? Useless?)
 411 /// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
 412 /// it's 2^24.
 413 pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
 414
 415 /// Used to return a simple Error back to ChannelManager. Will get converted to a
 416 /// msgs::ErrorAction::SendErrorMessage or msgs::ErrorAction::IgnoreError as appropriate with our
 417 /// channel_id in ChannelManager.
 418 pub(super) enum ChannelError {
 419         Ignore(&'static str),
 420         Close(&'static str),
 421 }
 422
 423 macro_rules! secp_call {
 424         ( $res: expr, $err: expr, $chan_id: expr ) => {
 425                 match $res {
 426                         Ok(key) => key,
 427                         Err(_) => return Err(HandleError {err: $err, action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: $chan_id, data: $err.to_string()}})})
 428                 }
 429         };
 430 }
 431
 432 macro_rules! secp_derived_key {
 433         ( $res: expr, $chan_id: expr ) => {
 434                 secp_call!($res, "Derived invalid key, peer is maliciously selecting parameters", $chan_id)
 435         }
 436 }
 437 impl Channel {
 438         // Convert constants + channel value to limits:
 439         fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
 440                 channel_value_satoshis * 1000 / 10 //TODO
 441         }
 442
 443         /// Returns a minimum channel reserve value **they** need to maintain
 444         ///
 445         /// Guaranteed to return a value no larger than channel_value_satoshis
 446         fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
 447                 let (q, _) = channel_value_satoshis.overflowing_div(100);
 448                 cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
 449         }
 450
 451         fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
 452                 at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT / 1000 //TODO
 453         }
 454
 455         fn derive_our_htlc_minimum_msat(_at_open_channel_feerate_per_kw: u64) -> u64 {
 456                 1000 // TODO
 457         }
 458
 459         fn derive_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
 460                 // Note that in order to comply with BOLT 7 announcement_signatures requirements this must
 461                 // be at least 6.
 462                 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
 463                 CONF_TARGET
 464         }
 465
 466         fn derive_maximum_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
 467                 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
 468                 CONF_TARGET * 2
 469         }
 470
 471         // Constructors:
 472         pub fn new_outbound(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, announce_publicly: bool, user_id: u64, logger: Arc<Logger>) -> Result<Channel, APIError> {
 473                 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
 474                         return Err(APIError::APIMisuseError{err: "funding value > 2^24"});
 475                 }
 476
 477                 if push_msat > channel_value_satoshis * 1000 {
 478                         return Err(APIError::APIMisuseError{err: "push value > channel value"});
 479                 }
 480
 481
 482                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
 483                 if Channel::get_our_channel_reserve_satoshis(channel_value_satoshis) < Channel::derive_our_dust_limit_satoshis(background_feerate) {
 484                         return Err(APIError::FeeRateTooHigh{err: format!("Not enough reserve above dust limit can be found at current fee rate({})", background_feerate), feerate: background_feerate});
 485                 }
 486
 487                 let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 488
 489                 let secp_ctx = Secp256k1::new();
 490                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).serialize());
 491                 let our_channel_monitor_claim_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script();
 492                 let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
 493                                                           &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key),
 494                                                           &chan_keys.htlc_base_key,
 495                                                           BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
 496
 497                 Ok(Channel {
 498                         user_id: user_id,
 499
 500                         channel_id: rng::rand_u832(),
 501                         channel_state: ChannelState::OurInitSent as u32,
 502                         channel_outbound: true,
 503                         secp_ctx: secp_ctx,
 504                         announce_publicly: announce_publicly,
 505                         channel_value_satoshis: channel_value_satoshis,
 506
 507                         local_keys: chan_keys,
 508                         cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 509                         cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 510                         value_to_self_msat: channel_value_satoshis * 1000 - push_msat,
 511                         received_commitment_while_awaiting_raa: false,
 512
 513                         pending_inbound_htlcs: Vec::new(),
 514                         pending_outbound_htlcs: Vec::new(),
 515                         holding_cell_htlc_updates: Vec::new(),
 516                         pending_update_fee: None,
 517                         holding_cell_update_fee: None,
 518                         next_local_htlc_id: 0,
 519                         next_remote_htlc_id: 0,
 520                         channel_update_count: 1,
 521
 522                         monitor_pending_revoke_and_ack: false,
 523                         monitor_pending_commitment_signed: false,
 524                         monitor_pending_order: None,
 525                         monitor_pending_forwards: Vec::new(),
 526                         monitor_pending_failures: Vec::new(),
 527
 528                         #[cfg(debug_assertions)]
 529                         max_commitment_tx_output_local: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
 530                         #[cfg(debug_assertions)]
 531                         max_commitment_tx_output_remote: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
 532
 533                         last_local_commitment_txn: Vec::new(),
 534
 535                         last_sent_closing_fee: None,
 536
 537                         funding_tx_confirmed_in: None,
 538                         short_channel_id: None,
 539                         last_block_connected: Default::default(),
 540                         funding_tx_confirmations: 0,
 541
 542                         feerate_per_kw: feerate,
 543                         their_dust_limit_satoshis: 0,
 544                         our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
 545                         their_max_htlc_value_in_flight_msat: 0,
 546                         their_channel_reserve_satoshis: 0,
 547                         their_htlc_minimum_msat: 0,
 548                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(feerate),
 549                         their_to_self_delay: 0,
 550                         their_max_accepted_htlcs: 0,
 551
 552                         their_funding_pubkey: None,
 553                         their_revocation_basepoint: None,
 554                         their_payment_basepoint: None,
 555                         their_delayed_payment_basepoint: None,
 556                         their_htlc_basepoint: None,
 557                         their_cur_commitment_point: None,
 558
 559                         their_prev_commitment_point: None,
 560                         their_node_id: their_node_id,
 561
 562                         their_shutdown_scriptpubkey: None,
 563
 564                         channel_monitor: channel_monitor,
 565
 566                         logger,
 567                 })
 568         }
 569
 570         fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), ChannelError> {
 571                 if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) {
 572                         return Err(ChannelError::Close("Peer's feerate much too low"));
 573                 }
 574                 if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) * 2 {
 575                         return Err(ChannelError::Close("Peer's feerate much too high"));
 576                 }
 577                 Ok(())
 578         }
 579
 580         /// Creates a new channel from a remote sides' request for one.
 581         /// Assumes chain_hash has already been checked and corresponds with what we expect!
 582         pub fn new_from_req(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, require_announce: bool, allow_announce: bool, logger: Arc<Logger>) -> Result<Channel, ChannelError> {
 583                 // Check sanity of message fields:
 584                 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
 585                         return Err(ChannelError::Close("funding value > 2^24"));
 586                 }
 587                 if msg.channel_reserve_satoshis > msg.funding_satoshis {
 588                         return Err(ChannelError::Close("Bogus channel_reserve_satoshis"));
 589                 }
 590                 if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 591                         return Err(ChannelError::Close("push_msat larger than funding value"));
 592                 }
 593                 if msg.dust_limit_satoshis > msg.funding_satoshis {
 594                         return Err(ChannelError::Close("Peer never wants payout outputs?"));
 595                 }
 596                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
 597                         return Err(ChannelError::Close("Bogus; channel reserve is less than dust limit"));
 598                 }
 599                 if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 600                         return Err(ChannelError::Close("Miminum htlc value is full channel value"));
 601                 }
 602                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
 603
 604                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
 605                         return Err(ChannelError::Close("They wanted our payments to be delayed by a needlessly long period"));
 606                 }
 607                 if msg.max_accepted_htlcs < 1 {
 608                         return Err(ChannelError::Close("0 max_accpted_htlcs makes for a useless channel"));
 609                 }
 610                 if msg.max_accepted_htlcs > 483 {
 611                         return Err(ChannelError::Close("max_accpted_htlcs > 483"));
 612                 }
 613
 614                 // Convert things into internal flags and prep our state:
 615
 616                 let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
 617                 if require_announce && !their_announce {
 618                         return Err(ChannelError::Close("Peer tried to open unannounced channel, but we require public ones"));
 619                 }
 620                 if !allow_announce && their_announce {
 621                         return Err(ChannelError::Close("Peer tried to open announced channel, but we require private ones"));
 622                 }
 623
 624                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
 625
 626                 let our_dust_limit_satoshis = Channel::derive_our_dust_limit_satoshis(background_feerate);
 627                 let our_channel_reserve_satoshis = Channel::get_our_channel_reserve_satoshis(msg.funding_satoshis);
 628                 if our_channel_reserve_satoshis < our_dust_limit_satoshis {
 629                         return Err(ChannelError::Close("Suitalbe channel reserve not found. aborting"));
 630                 }
 631                 if msg.channel_reserve_satoshis < our_dust_limit_satoshis {
 632                         return Err(ChannelError::Close("channel_reserve_satoshis too small"));
 633                 }
 634                 if our_channel_reserve_satoshis < msg.dust_limit_satoshis {
 635                         return Err(ChannelError::Close("Dust limit too high for our channel reserve"));
 636                 }
 637
 638                 // check if the funder's amount for the initial commitment tx is sufficient
 639                 // for full fee payment
 640                 let funders_amount_msat = msg.funding_satoshis * 1000 - msg.push_msat;
 641                 if funders_amount_msat < background_feerate * COMMITMENT_TX_BASE_WEIGHT {
 642                         return Err(ChannelError::Close("Insufficient funding amount for initial commitment"));
 643                 }
 644
 645                 let to_local_msat = msg.push_msat;
 646                 let to_remote_msat = funders_amount_msat - background_feerate * COMMITMENT_TX_BASE_WEIGHT;
 647                 if to_local_msat <= msg.channel_reserve_satoshis * 1000 && to_remote_msat <= our_channel_reserve_satoshis * 1000 {
 648                         return Err(ChannelError::Close("Insufficient funding amount for initial commitment"));
 649                 }
 650
 651                 let secp_ctx = Secp256k1::new();
 652                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).serialize());
 653                 let our_channel_monitor_claim_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script();
 654                 let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
 655                                                               &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key),
 656                                                               &chan_keys.htlc_base_key,
 657                                                               BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
 658                 channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
 659                 channel_monitor.set_their_to_self_delay(msg.to_self_delay);
 660
 661                 let mut chan = Channel {
 662                         user_id: user_id,
 663
 664                         channel_id: msg.temporary_channel_id,
 665                         channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
 666                         channel_outbound: false,
 667                         secp_ctx: secp_ctx,
 668                         announce_publicly: their_announce,
 669
 670                         local_keys: chan_keys,
 671                         cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 672                         cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 673                         value_to_self_msat: msg.push_msat,
 674                         received_commitment_while_awaiting_raa: false,
 675
 676                         pending_inbound_htlcs: Vec::new(),
 677                         pending_outbound_htlcs: Vec::new(),
 678                         holding_cell_htlc_updates: Vec::new(),
 679                         pending_update_fee: None,
 680                         holding_cell_update_fee: None,
 681                         next_local_htlc_id: 0,
 682                         next_remote_htlc_id: 0,
 683                         channel_update_count: 1,
 684
 685                         monitor_pending_revoke_and_ack: false,
 686                         monitor_pending_commitment_signed: false,
 687                         monitor_pending_order: None,
 688                         monitor_pending_forwards: Vec::new(),
 689                         monitor_pending_failures: Vec::new(),
 690
 691                         #[cfg(debug_assertions)]
 692                         max_commitment_tx_output_local: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
 693                         #[cfg(debug_assertions)]
 694                         max_commitment_tx_output_remote: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
 695
 696                         last_local_commitment_txn: Vec::new(),
 697
 698                         last_sent_closing_fee: None,
 699
 700                         funding_tx_confirmed_in: None,
 701                         short_channel_id: None,
 702                         last_block_connected: Default::default(),
 703                         funding_tx_confirmations: 0,
 704
 705                         feerate_per_kw: msg.feerate_per_kw as u64,
 706                         channel_value_satoshis: msg.funding_satoshis,
 707                         their_dust_limit_satoshis: msg.dust_limit_satoshis,
 708                         our_dust_limit_satoshis: our_dust_limit_satoshis,
 709                         their_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
 710                         their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
 711                         their_htlc_minimum_msat: msg.htlc_minimum_msat,
 712                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
 713                         their_to_self_delay: msg.to_self_delay,
 714                         their_max_accepted_htlcs: msg.max_accepted_htlcs,
 715
 716                         their_funding_pubkey: Some(msg.funding_pubkey),
 717                         their_revocation_basepoint: Some(msg.revocation_basepoint),
 718                         their_payment_basepoint: Some(msg.payment_basepoint),
 719                         their_delayed_payment_basepoint: Some(msg.delayed_payment_basepoint),
 720                         their_htlc_basepoint: Some(msg.htlc_basepoint),
 721                         their_cur_commitment_point: Some(msg.first_per_commitment_point),
 722
 723                         their_prev_commitment_point: None,
 724                         their_node_id: their_node_id,
 725
 726                         their_shutdown_scriptpubkey: None,
 727
 728                         channel_monitor: channel_monitor,
 729
 730                         logger,
 731                 };
 732
 733                 let obscure_factor = chan.get_commitment_transaction_number_obscure_factor();
 734                 chan.channel_monitor.set_commitment_obscure_factor(obscure_factor);
 735
 736                 Ok(chan)
 737         }
 738
 739         // Utilities to derive keys:
 740
 741         fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
 742                 let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, idx);
 743                 SecretKey::from_slice(&self.secp_ctx, &res).unwrap()
 744         }
 745
 746         // Utilities to build transactions:
 747
 748         fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
 749                 let mut sha = Sha256::new();
 750                 let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
 751
 752                 if self.channel_outbound {
 753                         sha.input(&our_payment_basepoint.serialize());
 754                         sha.input(&self.their_payment_basepoint.unwrap().serialize());
 755                 } else {
 756                         sha.input(&self.their_payment_basepoint.unwrap().serialize());
 757                         sha.input(&our_payment_basepoint.serialize());
 758                 }
 759                 let mut res = [0; 32];
 760                 sha.result(&mut res);
 761
 762                 ((res[26] as u64) << 5*8) |
 763                 ((res[27] as u64) << 4*8) |
 764                 ((res[28] as u64) << 3*8) |
 765                 ((res[29] as u64) << 2*8) |
 766                 ((res[30] as u64) << 1*8) |
 767                 ((res[31] as u64) << 0*8)
 768         }
 769
 770         /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
 771         /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
 772         /// the transaction. Thus, b will generally be sending a signature over such a transaction to
 773         /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
 774         /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
 775         /// an HTLC to a).
 776         /// @local is used only to convert relevant internal structures which refer to remote vs local
 777         /// to decide value of outputs and direction of HTLCs.
 778         /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
 779         /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
 780         /// have not yet committed it. Such HTLCs will only be included in transactions which are being
 781         /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
 782         /// which peer generated this transaction and "to whom" this transaction flows.
 783         #[inline]
 784         fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool, feerate_per_kw: u64) -> (Transaction, Vec<HTLCOutputInCommitment>) {
 785                 let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ (INITIAL_COMMITMENT_NUMBER - commitment_number);
 786
 787                 let txins = {
 788                         let mut ins: Vec<TxIn> = Vec::new();
 789                         ins.push(TxIn {
 790                                 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
 791                                 script_sig: Script::new(),
 792                                 sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
 793                                 witness: Vec::new(),
 794                         });
 795                         ins
 796                 };
 797
 798                 let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::with_capacity(self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len() + 2);
 799
 800                 let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
 801                 let mut remote_htlc_total_msat = 0;
 802                 let mut local_htlc_total_msat = 0;
 803                 let mut value_to_self_msat_offset = 0;
 804
 805                 macro_rules! add_htlc_output {
 806                         ($htlc: expr, $outbound: expr) => {
 807                                 if $outbound == local { // "offered HTLC output"
 808                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
 809                                                 let htlc_in_tx = get_htlc_in_commitment!($htlc, true);
 810                                                 txouts.push((TxOut {
 811                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
 812                                                         value: $htlc.amount_msat / 1000
 813                                                 }, Some(htlc_in_tx)));
 814                                         }
 815                                 } else {
 816                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
 817                                                 let htlc_in_tx = get_htlc_in_commitment!($htlc, false);
 818                                                 txouts.push((TxOut { // "received HTLC output"
 819                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
 820                                                         value: $htlc.amount_msat / 1000
 821                                                 }, Some(htlc_in_tx)));
 822                                         }
 823                                 }
 824                         }
 825                 }
 826
 827                 for ref htlc in self.pending_inbound_htlcs.iter() {
 828                         let include = match htlc.state {
 829                                 InboundHTLCState::RemoteAnnounced(_) => !generated_by_local,
 830                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) => !generated_by_local,
 831                                 InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => true,
 832                                 InboundHTLCState::Committed => true,
 833                                 InboundHTLCState::LocalRemoved(_) => !generated_by_local,
 834                         };
 835
 836                         if include {
 837                                 add_htlc_output!(htlc, false);
 838                                 remote_htlc_total_msat += htlc.amount_msat;
 839                         } else {
 840                                 match &htlc.state {
 841                                         &InboundHTLCState::LocalRemoved(ref reason) => {
 842                                                 if generated_by_local {
 843                                                         if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
 844                                                                 value_to_self_msat_offset += htlc.amount_msat as i64;
 845                                                         }
 846                                                 }
 847                                         },
 848                                         _ => {},
 849                                 }
 850                         }
 851                 }
 852
 853                 for ref htlc in self.pending_outbound_htlcs.iter() {
 854                         let include = match htlc.state {
 855                                 OutboundHTLCState::LocalAnnounced(_) => generated_by_local,
 856                                 OutboundHTLCState::Committed => true,
 857                                 OutboundHTLCState::RemoteRemoved => generated_by_local,
 858                                 OutboundHTLCState::AwaitingRemoteRevokeToRemove => generated_by_local,
 859                                 OutboundHTLCState::AwaitingRemovedRemoteRevoke => false,
 860                         };
 861
 862                         if include {
 863                                 add_htlc_output!(htlc, true);
 864                                 local_htlc_total_msat += htlc.amount_msat;
 865                         } else {
 866                                 match htlc.state {
 867                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove|OutboundHTLCState::AwaitingRemovedRemoteRevoke => {
 868                                                 if htlc.fail_reason.is_none() {
 869                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
 870                                                 }
 871                                         },
 872                                         OutboundHTLCState::RemoteRemoved => {
 873                                                 if !generated_by_local && htlc.fail_reason.is_none() {
 874                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
 875                                                 }
 876                                         },
 877                                         _ => {},
 878                                 }
 879                         }
 880                 }
 881
 882
 883                 let value_to_self_msat: i64 = (self.value_to_self_msat - local_htlc_total_msat) as i64 + value_to_self_msat_offset;
 884                 let value_to_remote_msat: i64 = (self.channel_value_satoshis * 1000 - self.value_to_self_msat - remote_htlc_total_msat) as i64 - value_to_self_msat_offset;
 885
 886                 #[cfg(debug_assertions)]
 887                 {
 888                         // Make sure that the to_self/to_remote is always either past the appropriate
 889                         // channel_reserve *or* it is making progress towards it.
 890                         // TODO: This should happen after fee calculation, but we don't handle that correctly
 891                         // yet!
 892                         let mut max_commitment_tx_output = if generated_by_local {
 893                                 self.max_commitment_tx_output_local.lock().unwrap()
 894                         } else {
 895                                 self.max_commitment_tx_output_remote.lock().unwrap()
 896                         };
 897                         debug_assert!(max_commitment_tx_output.0 <= value_to_self_msat as u64 || value_to_self_msat / 1000 >= self.their_channel_reserve_satoshis as i64);
 898                         max_commitment_tx_output.0 = cmp::max(max_commitment_tx_output.0, value_to_self_msat as u64);
 899                         debug_assert!(max_commitment_tx_output.1 <= value_to_remote_msat as u64 || value_to_remote_msat / 1000 >= Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis) as i64);
 900                         max_commitment_tx_output.1 = cmp::max(max_commitment_tx_output.1, value_to_remote_msat as u64);
 901                 }
 902
 903                 let total_fee: u64 = feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
 904                 let (value_to_self, value_to_remote) = if self.channel_outbound {
 905                         (value_to_self_msat / 1000 - total_fee as i64, value_to_remote_msat / 1000)
 906                 } else {
 907                         (value_to_self_msat / 1000, value_to_remote_msat / 1000 - total_fee as i64)
 908                 };
 909
 910                 let value_to_a = if local { value_to_self } else { value_to_remote };
 911                 let value_to_b = if local { value_to_remote } else { value_to_self };
 912
 913                 if value_to_a >= (dust_limit_satoshis as i64) {
 914                         txouts.push((TxOut {
 915                                 script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
 916                                                                                        if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
 917                                                                                        &keys.a_delayed_payment_key).to_v0_p2wsh(),
 918                                 value: value_to_a as u64
 919                         }, None));
 920                 }
 921
 922                 if value_to_b >= (dust_limit_satoshis as i64) {
 923                         txouts.push((TxOut {
 924                                 script_pubkey: Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
 925                                                              .push_slice(&Hash160::from_data(&keys.b_payment_key.serialize())[..])
 926                                                              .into_script(),
 927                                 value: value_to_b as u64
 928                         }, None));
 929                 }
 930
 931                 transaction_utils::sort_outputs(&mut txouts);
 932
 933                 let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
 934                 let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::with_capacity(txouts.len());
 935                 for (idx, out) in txouts.drain(..).enumerate() {
 936                         outputs.push(out.0);
 937                         if let Some(out_htlc) = out.1 {
 938                                 htlcs_used.push(out_htlc);
 939                                 htlcs_used.last_mut().unwrap().transaction_output_index = idx as u32;
 940                         }
 941                 }
 942
 943                 (Transaction {
 944                         version: 2,
 945                         lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
 946                         input: txins,
 947                         output: outputs,
 948                 }, htlcs_used)
 949         }
 950
 951         #[inline]
 952         fn get_closing_scriptpubkey(&self) -> Script {
 953                 let our_channel_close_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.channel_close_key).serialize());
 954                 Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
 955         }
 956
 957         #[inline]
 958         fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
 959                 (4 + 1 + 36 + 4 + 1 + 1 + 2*(8+1) + 4 + a_scriptpubkey.len() as u64 + b_scriptpubkey.len() as u64)*4 + 2 + 1 + 1 + 2*(1 + 72)
 960         }
 961
 962         #[inline]
 963         fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
 964                 let txins = {
 965                         let mut ins: Vec<TxIn> = Vec::new();
 966                         ins.push(TxIn {
 967                                 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
 968                                 script_sig: Script::new(),
 969                                 sequence: 0xffffffff,
 970                                 witness: Vec::new(),
 971                         });
 972                         ins
 973                 };
 974
 975                 assert!(self.pending_inbound_htlcs.is_empty());
 976                 assert!(self.pending_outbound_htlcs.is_empty());
 977                 let mut txouts: Vec<(TxOut, ())> = Vec::new();
 978
 979                 let mut total_fee_satoshis = proposed_total_fee_satoshis;
 980                 let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
 981                 let value_to_remote: i64 = ((self.channel_value_satoshis * 1000 - self.value_to_self_msat) as i64 / 1000) - if self.channel_outbound { 0 } else { total_fee_satoshis as i64 };
 982
 983                 if value_to_self < 0 {
 984                         assert!(self.channel_outbound);
 985                         total_fee_satoshis += (-value_to_self) as u64;
 986                 } else if value_to_remote < 0 {
 987                         assert!(!self.channel_outbound);
 988                         total_fee_satoshis += (-value_to_remote) as u64;
 989                 }
 990
 991                 if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
 992                         txouts.push((TxOut {
 993                                 script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
 994                                 value: value_to_remote as u64
 995                         }, ()));
 996                 }
 997
 998                 if value_to_self as u64 > self.our_dust_limit_satoshis {
 999                         txouts.push((TxOut {
1000                                 script_pubkey: self.get_closing_scriptpubkey(),
1001                                 value: value_to_self as u64
1002                         }, ()));
1003                 }
1004
1005                 transaction_utils::sort_outputs(&mut txouts);
1006
1007                 let mut outputs: Vec<TxOut> = Vec::new();
1008                 for out in txouts.drain(..) {
1009                         outputs.push(out.0);
1010                 }
1011
1012                 (Transaction {
1013                         version: 2,
1014                         lock_time: 0,
1015                         input: txins,
1016                         output: outputs,
1017                 }, total_fee_satoshis)
1018         }
1019
1020         #[inline]
1021         /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
1022         /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
1023         /// our counterparty!)
1024         /// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
1025         /// TODO Some magic rust shit to compile-time check this?
1026         fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, HandleError> {
1027                 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number));
1028                 let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key);
1029                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
1030
1031                 Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &self.their_revocation_basepoint.unwrap(), &self.their_payment_basepoint.unwrap(), &self.their_htlc_basepoint.unwrap()), self.channel_id()))
1032         }
1033
1034         #[inline]
1035         /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
1036         /// will sign and send to our counterparty.
1037         fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, HandleError> {
1038                 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
1039                 //may see payments to it!
1040                 let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
1041                 let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key);
1042                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
1043
1044                 Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point.unwrap(), &self.their_delayed_payment_basepoint.unwrap(), &self.their_htlc_basepoint.unwrap(), &revocation_basepoint, &payment_basepoint, &htlc_basepoint), self.channel_id()))
1045         }
1046
1047         /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
1048         /// pays to get_funding_redeemscript().to_v0_p2wsh()).
1049         /// Panics if called before accept_channel/new_from_req
1050         pub fn get_funding_redeemscript(&self) -> Script {
1051                 let builder = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2);
1052                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
1053                 let their_funding_key = self.their_funding_pubkey.expect("get_funding_redeemscript only allowed after accept_channel").serialize();
1054                 if our_funding_key[..] < their_funding_key[..] {
1055                         builder.push_slice(&our_funding_key)
1056                                 .push_slice(&their_funding_key)
1057                 } else {
1058                         builder.push_slice(&their_funding_key)
1059                                 .push_slice(&our_funding_key)
1060                 }.push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script()
1061         }
1062
1063         fn sign_commitment_transaction(&self, tx: &mut Transaction, their_sig: &Signature) -> Signature {
1064                 if tx.input.len() != 1 {
1065                         panic!("Tried to sign commitment transaction that had input count != 1!");
1066                 }
1067                 if tx.input[0].witness.len() != 0 {
1068                         panic!("Tried to re-sign commitment transaction");
1069                 }
1070
1071                 let funding_redeemscript = self.get_funding_redeemscript();
1072
1073                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1074                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
1075
1076                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1077
1078                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
1079                 let their_funding_key = self.their_funding_pubkey.unwrap().serialize();
1080                 if our_funding_key[..] < their_funding_key[..] {
1081                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1082                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1083                 } else {
1084                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1085                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1086                 }
1087                 tx.input[0].witness[1].push(SigHashType::All as u8);
1088                 tx.input[0].witness[2].push(SigHashType::All as u8);
1089
1090                 tx.input[0].witness.push(funding_redeemscript.into_bytes());
1091
1092                 our_sig
1093         }
1094
1095         /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
1096         /// @local is used only to convert relevant internal structures which refer to remote vs local
1097         /// to decide value of outputs and direction of HTLCs.
1098         fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys, feerate_per_kw: u64) -> Transaction {
1099                 chan_utils::build_htlc_transaction(prev_hash, feerate_per_kw, if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
1100         }
1101
1102         fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), HandleError> {
1103                 if tx.input.len() != 1 {
1104                         panic!("Tried to sign HTLC transaction that had input count != 1!");
1105                 }
1106
1107                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
1108
1109                 let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &keys.per_commitment_point, &self.local_keys.htlc_base_key), self.channel_id());
1110                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1111                 let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key) == keys.a_htlc_key;
1112                 Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key), is_local_tx))
1113         }
1114
1115         /// Signs a transaction created by build_htlc_transaction. If the transaction is an
1116         /// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
1117         fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, HandleError> {
1118                 if tx.input.len() != 1 {
1119                         panic!("Tried to sign HTLC transaction that had input count != 1!");
1120                 }
1121                 if tx.input[0].witness.len() != 0 {
1122                         panic!("Tried to re-sign HTLC transaction");
1123                 }
1124
1125                 let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
1126
1127                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1128
1129                 if local_tx { // b, then a
1130                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1131                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1132                 } else {
1133                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1134                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1135                 }
1136                 tx.input[0].witness[1].push(SigHashType::All as u8);
1137                 tx.input[0].witness[2].push(SigHashType::All as u8);
1138
1139                 if htlc.offered {
1140                         tx.input[0].witness.push(Vec::new());
1141                 } else {
1142                         tx.input[0].witness.push(preimage.unwrap().to_vec());
1143                 }
1144
1145                 tx.input[0].witness.push(htlc_redeemscript.into_bytes());
1146
1147                 Ok(our_sig)
1148         }
1149
1150         /// May return an IgnoreError, but should not, and will always return Ok(_) when
1151         /// debug_assertions are turned on
1152         fn get_update_fulfill_htlc(&mut self, htlc_id_arg: u64, payment_preimage_arg: [u8; 32]) -> Result<(Option<msgs::UpdateFulfillHTLC>, Option<ChannelMonitor>), HandleError> {
1153                 // Either ChannelFunded got set (which means it wont bet unset) or there is no way any
1154                 // caller thought we could have something claimed (cause we wouldn't have accepted in an
1155                 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
1156                 // either.
1157                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1158                         panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
1159                 }
1160                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1161
1162                 let mut sha = Sha256::new();
1163                 sha.input(&payment_preimage_arg);
1164                 let mut payment_hash_calc = [0; 32];
1165                 sha.result(&mut payment_hash_calc);
1166
1167                 let mut pending_idx = std::usize::MAX;
1168                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1169                         if htlc.htlc_id == htlc_id_arg {
1170                                 assert_eq!(htlc.payment_hash, payment_hash_calc);
1171                                 if let InboundHTLCState::Committed = htlc.state {
1172                                 } else {
1173                                         debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1174                                         // Don't return in release mode here so that we can update channel_monitor
1175                                 }
1176                                 pending_idx = idx;
1177                                 break;
1178                         }
1179                 }
1180                 if pending_idx == std::usize::MAX {
1181                         debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1182                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1183                 }
1184
1185                 // Now update local state:
1186                 //
1187                 // We have to put the payment_preimage in the channel_monitor right away here to ensure we
1188                 // can claim it even if the channel hits the chain before we see their next commitment.
1189                 self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
1190
1191                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1192                         for pending_update in self.holding_cell_htlc_updates.iter() {
1193                                 match pending_update {
1194                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1195                                                 if htlc_id_arg == htlc_id {
1196                                                         debug_assert!(false, "Tried to fulfill an HTLC we already had a pending fulfill for");
1197                                                         return Ok((None, None));
1198                                                 }
1199                                         },
1200                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1201                                                 if htlc_id_arg == htlc_id {
1202                                                         debug_assert!(false, "Tried to fulfill an HTLC we already had a holding-cell failure on");
1203                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1204                                                 }
1205                                         },
1206                                         _ => {}
1207                                 }
1208                         }
1209                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
1210                                 payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
1211                         });
1212                         return Ok((None, Some(self.channel_monitor.clone())));
1213                 }
1214
1215                 {
1216                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1217                         if let InboundHTLCState::Committed = htlc.state {
1218                         } else {
1219                                 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1220                                 return Ok((None, Some(self.channel_monitor.clone())));
1221                         }
1222                         htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::Fulfill(payment_preimage_arg.clone()));
1223                 }
1224
1225                 Ok((Some(msgs::UpdateFulfillHTLC {
1226                         channel_id: self.channel_id(),
1227                         htlc_id: htlc_id_arg,
1228                         payment_preimage: payment_preimage_arg,
1229                 }), Some(self.channel_monitor.clone())))
1230         }
1231
1232         pub fn get_update_fulfill_htlc_and_commit(&mut self, htlc_id: u64, payment_preimage: [u8; 32]) -> Result<(Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>, Option<ChannelMonitor>), HandleError> {
1233                 match self.get_update_fulfill_htlc(htlc_id, payment_preimage)? {
1234                         (Some(update_fulfill_htlc), _) => {
1235                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1236                                 Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
1237                         },
1238                         (None, Some(channel_monitor)) => Ok((None, Some(channel_monitor))),
1239                         (None, None) => Ok((None, None))
1240                 }
1241         }
1242
1243         /// May return an IgnoreError, but should not, and will always return Ok(_) when
1244         /// debug_assertions are turned on
1245         pub fn get_update_fail_htlc(&mut self, htlc_id_arg: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, HandleError> {
1246                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1247                         panic!("Was asked to fail an HTLC when channel was not in an operational state");
1248                 }
1249                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1250
1251                 let mut pending_idx = std::usize::MAX;
1252                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1253                         if htlc.htlc_id == htlc_id_arg {
1254                                 if let InboundHTLCState::Committed = htlc.state {
1255                                 } else {
1256                                         debug_assert!(false, "Have an inbound HTLC we tried to fail before it was fully committed to");
1257                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1258                                 }
1259                                 pending_idx = idx;
1260                         }
1261                 }
1262                 if pending_idx == std::usize::MAX {
1263                         debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1264                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1265                 }
1266
1267                 // Now update local state:
1268                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1269                         for pending_update in self.holding_cell_htlc_updates.iter() {
1270                                 match pending_update {
1271                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1272                                                 if htlc_id_arg == htlc_id {
1273                                                         debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1274                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1275                                                 }
1276                                         },
1277                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1278                                                 if htlc_id_arg == htlc_id {
1279                                                         debug_assert!(false, "Tried to fail an HTLC that we already had a pending failure for");
1280                                                         return Ok(None);
1281                                                 }
1282                                         },
1283                                         _ => {}
1284                                 }
1285                         }
1286                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1287                                 htlc_id: htlc_id_arg,
1288                                 err_packet,
1289                         });
1290                         return Ok(None);
1291                 }
1292
1293                 {
1294                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1295                         htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(err_packet.clone()));
1296                 }
1297
1298                 Ok(Some(msgs::UpdateFailHTLC {
1299                         channel_id: self.channel_id(),
1300                         htlc_id: htlc_id_arg,
1301                         reason: err_packet
1302                 }))
1303         }
1304
1305         pub fn get_update_fail_htlc_and_commit(&mut self, htlc_id: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
1306                 match self.get_update_fail_htlc(htlc_id, err_packet)? {
1307                         Some(update_fail_htlc) => {
1308                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1309                                 Ok(Some((update_fail_htlc, commitment, monitor_update)))
1310                         },
1311                         None => Ok(None)
1312                 }
1313         }
1314
1315         // Message handlers:
1316
1317         pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel) -> Result<(), ChannelError> {
1318                 // Check sanity of message fields:
1319                 if !self.channel_outbound {
1320                         return Err(ChannelError::Close("Got an accept_channel message from an inbound peer"));
1321                 }
1322                 if self.channel_state != ChannelState::OurInitSent as u32 {
1323                         return Err(ChannelError::Close("Got an accept_channel message at a strange time"));
1324                 }
1325                 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1326                         return Err(ChannelError::Close("Peer never wants payout outputs?"));
1327                 }
1328                 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1329                         return Err(ChannelError::Close("Bogus channel_reserve_satoshis"));
1330                 }
1331                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
1332                         return Err(ChannelError::Close("Bogus channel_reserve and dust_limit"));
1333                 }
1334                 if msg.channel_reserve_satoshis < self.our_dust_limit_satoshis {
1335                         return Err(ChannelError::Close("Peer never wants payout outputs?"));
1336                 }
1337                 if msg.dust_limit_satoshis > Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis) {
1338                         return Err(ChannelError::Close("Dust limit is bigger than our channel reverse"));
1339                 }
1340                 if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
1341                         return Err(ChannelError::Close("Minimum htlc value is full channel value"));
1342                 }
1343                 if msg.minimum_depth > Channel::derive_maximum_minimum_depth(self.channel_value_satoshis*1000,  self.value_to_self_msat) {
1344                         return Err(ChannelError::Close("minimum_depth too large"));
1345                 }
1346                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
1347                         return Err(ChannelError::Close("They wanted our payments to be delayed by a needlessly long period"));
1348                 }
1349                 if msg.max_accepted_htlcs < 1 {
1350                         return Err(ChannelError::Close("0 max_accpted_htlcs makes for a useless channel"));
1351                 }
1352                 if msg.max_accepted_htlcs > 483 {
1353                         return Err(ChannelError::Close("max_accpted_htlcs > 483"));
1354                 }
1355
1356                 // TODO: Optional additional constraints mentioned in the spec
1357                 // MAY fail the channel if
1358                 // funding_satoshi is too small
1359                 // htlc_minimum_msat too large
1360                 // max_htlc_value_in_flight_msat too small
1361                 // channel_reserve_satoshis too large
1362                 // max_accepted_htlcs too small
1363                 // dust_limit_satoshis too small
1364
1365                 self.channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
1366
1367                 self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
1368                 self.their_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
1369                 self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
1370                 self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
1371                 self.their_to_self_delay = msg.to_self_delay;
1372                 self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
1373                 self.their_funding_pubkey = Some(msg.funding_pubkey);
1374                 self.their_revocation_basepoint = Some(msg.revocation_basepoint);
1375                 self.their_payment_basepoint = Some(msg.payment_basepoint);
1376                 self.their_delayed_payment_basepoint = Some(msg.delayed_payment_basepoint);
1377                 self.their_htlc_basepoint = Some(msg.htlc_basepoint);
1378                 self.their_cur_commitment_point = Some(msg.first_per_commitment_point);
1379
1380                 let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
1381                 self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
1382                 self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
1383
1384                 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1385
1386                 Ok(())
1387         }
1388
1389         fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, Signature), HandleError> {
1390                 let funding_script = self.get_funding_redeemscript();
1391
1392                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1393                 let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, self.feerate_per_kw).0;
1394                 let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1395
1396                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1397                 secp_call!(self.secp_ctx.verify(&local_sighash, &sig, &self.their_funding_pubkey.unwrap()), "Invalid funding_created signature from peer", self.channel_id());
1398
1399                 let remote_keys = self.build_remote_transaction_keys()?;
1400                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false, self.feerate_per_kw).0;
1401                 let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1402
1403                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
1404                 Ok((remote_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key)))
1405         }
1406
1407         pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), HandleError> {
1408                 if self.channel_outbound {
1409                         return Err(HandleError{err: "Received funding_created for an outbound channel?", action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: self.channel_id, data: "Received funding_created for an outbound channel?".to_string()}})});
1410                 }
1411                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1412                         // BOLT 2 says that if we disconnect before we send funding_signed we SHOULD NOT
1413                         // remember the channel, so its safe to just send an error_message here and drop the
1414                         // channel.
1415                         return Err(HandleError{err: "Received funding_created after we got the channel!", action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: self.channel_id, data: "Received funding_created after we got the channel!".to_string()}})});
1416                 }
1417                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
1418                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
1419                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1420                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1421                 }
1422
1423                 let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
1424                 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
1425                 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
1426
1427                 let (remote_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
1428                         Ok(res) => res,
1429                         Err(e) => {
1430                                 self.channel_monitor.unset_funding_info();
1431                                 return Err(e);
1432                         }
1433                 };
1434
1435                 // Now that we're past error-generating stuff, update our local state:
1436
1437                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
1438                 self.channel_state = ChannelState::FundingSent as u32;
1439                 self.channel_id = funding_txo.to_channel_id();
1440                 self.cur_remote_commitment_transaction_number -= 1;
1441                 self.cur_local_commitment_transaction_number -= 1;
1442
1443                 Ok((msgs::FundingSigned {
1444                         channel_id: self.channel_id,
1445                         signature: our_signature
1446                 }, self.channel_monitor.clone()))
1447         }
1448
1449         /// Handles a funding_signed message from the remote end.
1450         /// If this call is successful, broadcast the funding transaction (and not before!)
1451         pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, HandleError> {
1452                 if !self.channel_outbound {
1453                         return Err(HandleError{err: "Received funding_signed for an inbound channel?", action: None});
1454                 }
1455                 if self.channel_state != ChannelState::FundingCreated as u32 {
1456                         return Err(HandleError{err: "Received funding_signed in strange state!", action: None});
1457                 }
1458                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
1459                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER - 1 ||
1460                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1461                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1462                 }
1463
1464                 let funding_script = self.get_funding_redeemscript();
1465
1466                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1467                 let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, self.feerate_per_kw).0;
1468                 let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1469
1470                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1471                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid funding_signed signature from peer", self.channel_id());
1472
1473                 self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
1474                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
1475                 self.last_local_commitment_txn = vec![local_initial_commitment_tx];
1476                 self.channel_state = ChannelState::FundingSent as u32;
1477                 self.cur_local_commitment_transaction_number -= 1;
1478
1479                 Ok(self.channel_monitor.clone())
1480         }
1481
1482         pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), ChannelError> {
1483                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1484                         return Err(ChannelError::Close("Peer sent funding_locked when we needed a channel_reestablish"));
1485                 }
1486
1487                 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
1488
1489                 if non_shutdown_state == ChannelState::FundingSent as u32 {
1490                         self.channel_state |= ChannelState::TheirFundingLocked as u32;
1491                 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1492                         self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
1493                         self.channel_update_count += 1;
1494                 } else if self.channel_state & (ChannelState::ChannelFunded as u32) != 0 &&
1495                                 // Note that funding_signed/funding_created will have decremented both by 1!
1496                                 self.cur_local_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 &&
1497                                 self.cur_remote_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 {
1498                         if self.their_cur_commitment_point != Some(msg.next_per_commitment_point) {
1499                                 return Err(ChannelError::Close("Peer sent a reconnect funding_locked with a different point"));
1500                         }
1501                         // They probably disconnected/reconnected and re-sent the funding_locked, which is required
1502                         return Ok(());
1503                 } else {
1504                         return Err(ChannelError::Close("Peer sent a funding_locked at a strange time"));
1505                 }
1506
1507                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1508                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1509                 Ok(())
1510         }
1511
1512         /// Returns (inbound_htlc_count, htlc_inbound_value_msat)
1513         fn get_inbound_pending_htlc_stats(&self) -> (u32, u64) {
1514                 let mut htlc_inbound_value_msat = 0;
1515                 for ref htlc in self.pending_inbound_htlcs.iter() {
1516                         htlc_inbound_value_msat += htlc.amount_msat;
1517                 }
1518                 (self.pending_inbound_htlcs.len() as u32, htlc_inbound_value_msat)
1519         }
1520
1521         /// Returns (outbound_htlc_count, htlc_outbound_value_msat)
1522         fn get_outbound_pending_htlc_stats(&self) -> (u32, u64) {
1523                 let mut htlc_outbound_value_msat = 0;
1524                 for ref htlc in self.pending_outbound_htlcs.iter() {
1525                         htlc_outbound_value_msat += htlc.amount_msat;
1526                 }
1527
1528                 (self.pending_outbound_htlcs.len() as u32, htlc_outbound_value_msat)
1529         }
1530
1531         pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingHTLCStatus) -> Result<(), HandleError> {
1532                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
1533                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1534                 }
1535                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1536                         return Err(HandleError{err: "Peer sent update_add_htlc when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent update_add_htlc when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1537                 }
1538                 if msg.amount_msat > self.channel_value_satoshis * 1000 {
1539                         return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", action: None});
1540                 }
1541                 if msg.amount_msat < self.our_htlc_minimum_msat {
1542                         return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", action: None});
1543                 }
1544
1545                 let (inbound_htlc_count, htlc_inbound_value_msat) = self.get_inbound_pending_htlc_stats();
1546                 if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
1547                         return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", action: None});
1548                 }
1549                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
1550                 // Check our_max_htlc_value_in_flight_msat
1551                 if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
1552                         return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", action: None});
1553                 }
1554                 // Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
1555                 // the reserve_satoshis we told them to always have as direct payment so that they lose
1556                 // something if we punish them for broadcasting an old state).
1557                 if htlc_inbound_value_msat + msg.amount_msat + self.value_to_self_msat > (self.channel_value_satoshis - Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis)) * 1000 {
1558                         return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", action: None});
1559                 }
1560                 if self.next_remote_htlc_id != msg.htlc_id {
1561                         return Err(HandleError{err: "Remote skipped HTLC ID", action: None});
1562                 }
1563                 if msg.cltv_expiry >= 500000000 {
1564                         return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", action: None});
1565                 }
1566
1567                 //TODO: Check msg.cltv_expiry further? Do this in channel manager?
1568
1569                 // Now update local state:
1570                 self.next_remote_htlc_id += 1;
1571                 self.pending_inbound_htlcs.push(InboundHTLCOutput {
1572                         htlc_id: msg.htlc_id,
1573                         amount_msat: msg.amount_msat,
1574                         payment_hash: msg.payment_hash,
1575                         cltv_expiry: msg.cltv_expiry,
1576                         state: InboundHTLCState::RemoteAnnounced(pending_forward_state),
1577                 });
1578
1579                 Ok(())
1580         }
1581
1582         /// Marks an outbound HTLC which we have received update_fail/fulfill/malformed
1583         #[inline]
1584         fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<&HTLCSource, ChannelError> {
1585                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1586                         if htlc.htlc_id == htlc_id {
1587                                 match check_preimage {
1588                                         None => {},
1589                                         Some(payment_hash) =>
1590                                                 if payment_hash != htlc.payment_hash {
1591                                                         return Err(ChannelError::Close("Remote tried to fulfill HTLC with an incorrect preimage"));
1592                                                 }
1593                                 };
1594                                 match htlc.state {
1595                                         OutboundHTLCState::LocalAnnounced(_) =>
1596                                                 return Err(ChannelError::Close("Remote tried to fulfill/fail HTLC before it had been committed")),
1597                                         OutboundHTLCState::Committed => {
1598                                                 htlc.state = OutboundHTLCState::RemoteRemoved;
1599                                                 htlc.fail_reason = fail_reason;
1600                                         },
1601                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove | OutboundHTLCState::AwaitingRemovedRemoteRevoke | OutboundHTLCState::RemoteRemoved =>
1602                                                 return Err(ChannelError::Close("Remote tried to fulfill/fail HTLC that they'd already fulfilled/failed")),
1603                                 }
1604                                 return Ok(&htlc.source);
1605                         }
1606                 }
1607                 Err(ChannelError::Close("Remote tried to fulfill/fail an HTLC we couldn't find"))
1608         }
1609
1610         pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<&HTLCSource, ChannelError> {
1611                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1612                         return Err(ChannelError::Close("Got fulfill HTLC message when channel was not in an operational state"));
1613                 }
1614                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1615                         return Err(ChannelError::Close("Peer sent update_fulfill_htlc when we needed a channel_reestablish"));
1616                 }
1617
1618                 let mut sha = Sha256::new();
1619                 sha.input(&msg.payment_preimage);
1620                 let mut payment_hash = [0; 32];
1621                 sha.result(&mut payment_hash);
1622
1623                 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)
1624         }
1625
1626         pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<&HTLCSource, ChannelError> {
1627                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1628                         return Err(ChannelError::Close("Got fail HTLC message when channel was not in an operational state"));
1629                 }
1630                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1631                         return Err(ChannelError::Close("Peer sent update_fail_htlc when we needed a channel_reestablish"));
1632                 }
1633
1634                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1635         }
1636
1637         pub fn update_fail_malformed_htlc<'a>(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<&HTLCSource, ChannelError> {
1638                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1639                         return Err(ChannelError::Close("Got fail malformed HTLC message when channel was not in an operational state"));
1640                 }
1641                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1642                         return Err(ChannelError::Close("Peer sent update_fail_malformed_htlc when we needed a channel_reestablish"));
1643                 }
1644
1645                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1646         }
1647
1648         pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitor), HandleError> {
1649                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1650                         return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", action: None});
1651                 }
1652                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1653                         return Err(HandleError{err: "Peer sent commitment_signed when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent commitment_signed when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1654                 }
1655
1656                 let funding_script = self.get_funding_redeemscript();
1657
1658                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1659
1660                 let feerate_per_kw = if !self.channel_outbound && self.pending_update_fee.is_some() {
1661                         self.pending_update_fee.unwrap()
1662                 } else {
1663                         self.feerate_per_kw
1664                 };
1665
1666                 let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, feerate_per_kw);
1667                 let local_commitment_txid = local_commitment_tx.0.txid();
1668                 let local_sighash = Message::from_slice(&bip143::SighashComponents::new(&local_commitment_tx.0).sighash_all(&local_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
1669                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid commitment tx signature from peer", self.channel_id());
1670
1671                 if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
1672                         return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", action: None});
1673                 }
1674
1675                 let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
1676                 self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
1677                 new_local_commitment_txn.push(local_commitment_tx.0.clone());
1678
1679                 let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
1680                 for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
1681                         let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys, feerate_per_kw);
1682                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
1683                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1684                         secp_call!(self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key), "Invalid HTLC tx siganture from peer", self.channel_id());
1685                         let htlc_sig = if htlc.offered {
1686                                 let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
1687                                 new_local_commitment_txn.push(htlc_tx);
1688                                 htlc_sig
1689                         } else {
1690                                 self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
1691                         };
1692                         htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
1693                 }
1694
1695                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1));
1696                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
1697
1698                 // Update state now that we've passed all the can-fail calls...
1699                 let mut need_our_commitment = false;
1700                 if !self.channel_outbound {
1701                         if let Some(fee_update) = self.pending_update_fee {
1702                                 self.feerate_per_kw = fee_update;
1703                                 // We later use the presence of pending_update_fee to indicate we should generate a
1704                                 // commitment_signed upon receipt of revoke_and_ack, so we can only set it to None
1705                                 // if we're not awaiting a revoke (ie will send a commitment_signed now).
1706                                 if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) == 0 {
1707                                         need_our_commitment = true;
1708                                         self.pending_update_fee = None;
1709                                 }
1710                         }
1711                 }
1712                 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
1713                         // This is a response to our post-monitor-failed unfreeze messages, so we can clear the
1714                         // monitor_pending_order requirement as we won't re-send the monitor_pending messages.
1715                         self.monitor_pending_order = None;
1716                 }
1717
1718                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
1719
1720                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1721                         let new_forward = if let &InboundHTLCState::RemoteAnnounced(ref forward_info) = &htlc.state {
1722                                 Some(forward_info.clone())
1723                         } else { None };
1724                         if let Some(forward_info) = new_forward {
1725                                 htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info);
1726                                 need_our_commitment = true;
1727                         }
1728                 }
1729                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1730                         if let OutboundHTLCState::RemoteRemoved = htlc.state {
1731                                 htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove;
1732                                 need_our_commitment = true;
1733                         }
1734                 }
1735
1736                 self.cur_local_commitment_transaction_number -= 1;
1737                 self.last_local_commitment_txn = new_local_commitment_txn;
1738                 self.received_commitment_while_awaiting_raa = (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) != 0;
1739
1740                 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0 {
1741                         self.monitor_pending_revoke_and_ack = true;
1742                         self.monitor_pending_commitment_signed |= need_our_commitment;
1743                         return Err(HandleError{err: "Previous monitor update failure prevented generation of RAA", action: Some(ErrorAction::IgnoreError)});
1744                 }
1745
1746                 let (our_commitment_signed, monitor_update) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1747                         // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
1748                         // we'll send one right away when we get the revoke_and_ack when we
1749                         // free_holding_cell_htlcs().
1750                         let (msg, monitor) = self.send_commitment_no_status_check()?;
1751                         (Some(msg), monitor)
1752                 } else { (None, self.channel_monitor.clone()) };
1753
1754                 Ok((msgs::RevokeAndACK {
1755                         channel_id: self.channel_id,
1756                         per_commitment_secret: per_commitment_secret,
1757                         next_per_commitment_point: next_per_commitment_point,
1758                 }, our_commitment_signed, monitor_update))
1759         }
1760
1761         /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
1762         /// fulfilling or failing the last pending HTLC)
1763         fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, HandleError> {
1764                 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
1765                 if self.holding_cell_htlc_updates.len() != 0 || self.holding_cell_update_fee.is_some() {
1766                         let mut htlc_updates = Vec::new();
1767                         mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
1768                         let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
1769                         let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
1770                         let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
1771                         let mut err = None;
1772                         for htlc_update in htlc_updates.drain(..) {
1773                                 // Note that this *can* fail, though it should be due to rather-rare conditions on
1774                                 // fee races with adding too many outputs which push our total payments just over
1775                                 // the limit. In case its less rare than I anticipate, we may want to revisit
1776                                 // handling this case better and maybe fufilling some of the HTLCs while attempting
1777                                 // to rebalance channels.
1778                                 if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
1779                                         self.holding_cell_htlc_updates.push(htlc_update);
1780                                 } else {
1781                                         match &htlc_update {
1782                                                 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, payment_hash, ref source, ref onion_routing_packet, ..} => {
1783                                                         match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone()) {
1784                                                                 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
1785                                                                 Err(e) => {
1786                                                                         err = Some(e);
1787                                                                 }
1788                                                         }
1789                                                 },
1790                                                 &HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, htlc_id, .. } => {
1791                                                         match self.get_update_fulfill_htlc(htlc_id, payment_preimage) {
1792                                                                 Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.0.unwrap()),
1793                                                                 Err(e) => {
1794                                                                         if let Some(msgs::ErrorAction::IgnoreError) = e.action {}
1795                                                                         else {
1796                                                                                 panic!("Got a non-IgnoreError action trying to fulfill holding cell HTLC");
1797                                                                         }
1798                                                                 }
1799                                                         }
1800                                                 },
1801                                                 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
1802                                                         match self.get_update_fail_htlc(htlc_id, err_packet.clone()) {
1803                                                                 Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
1804                                                                 Err(e) => {
1805                                                                         if let Some(msgs::ErrorAction::IgnoreError) = e.action {}
1806                                                                         else {
1807                                                                                 panic!("Got a non-IgnoreError action trying to fail holding cell HTLC");
1808                                                                         }
1809                                                                 }
1810                                                         }
1811                                                 },
1812                                         }
1813                                         if err.is_some() {
1814                                                 self.holding_cell_htlc_updates.push(htlc_update);
1815                                         }
1816                                 }
1817                         }
1818                         //TODO: Need to examine the type of err - if its a fee issue or similar we may want to
1819                         //fail it back the route, if its a temporary issue we can ignore it...
1820                         match err {
1821                                 None => {
1822                                         if update_add_htlcs.is_empty() && update_fulfill_htlcs.is_empty() && update_fail_htlcs.is_empty() && self.holding_cell_update_fee.is_none() {
1823                                                 // This should never actually happen and indicates we got some Errs back
1824                                                 // from update_fulfill_htlc/update_fail_htlc, but we handle it anyway in
1825                                                 // case there is some strange way to hit duplicate HTLC removes.
1826                                                 return Ok(None);
1827                                         }
1828                                         let update_fee = if let Some(feerate) = self.holding_cell_update_fee {
1829                                                         self.pending_update_fee = self.holding_cell_update_fee.take();
1830                                                         Some(msgs::UpdateFee {
1831                                                                 channel_id: self.channel_id,
1832                                                                 feerate_per_kw: feerate as u32,
1833                                                         })
1834                                                 } else {
1835                                                         None
1836                                                 };
1837                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1838                                         Ok(Some((msgs::CommitmentUpdate {
1839                                                 update_add_htlcs,
1840                                                 update_fulfill_htlcs,
1841                                                 update_fail_htlcs,
1842                                                 update_fail_malformed_htlcs: Vec::new(),
1843                                                 update_fee: update_fee,
1844                                                 commitment_signed,
1845                                         }, monitor_update)))
1846                                 },
1847                                 Some(e) => Err(e)
1848                         }
1849                 } else {
1850                         Ok(None)
1851                 }
1852         }
1853
1854         /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
1855         /// commitment_signed message here in case we had pending outbound HTLCs to add which were
1856         /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
1857         /// generating an appropriate error *after* the channel state has been updated based on the
1858         /// revoke_and_ack message.
1859         pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingForwardHTLCInfo, u64)>, Vec<(HTLCSource, [u8; 32], HTLCFailReason)>, ChannelMonitor), HandleError> {
1860                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1861                         return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", action: None});
1862                 }
1863                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1864                         return Err(HandleError{err: "Peer sent revoke_and_ack when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent revoke_and_ack when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1865                 }
1866
1867                 if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
1868                         if PublicKey::from_secret_key(&self.secp_ctx, &secp_call!(SecretKey::from_slice(&self.secp_ctx, &msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret", self.channel_id())) != their_prev_commitment_point {
1869                                 return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", action: None});
1870                         }
1871                 }
1872                 self.channel_monitor.provide_secret(self.cur_remote_commitment_transaction_number + 1, msg.per_commitment_secret, Some((self.cur_remote_commitment_transaction_number - 1, msg.next_per_commitment_point)))?;
1873
1874                 // Update state now that we've passed all the can-fail calls...
1875                 // (note that we may still fail to generate the new commitment_signed message, but that's
1876                 // OK, we step the channel here and *then* if the new generation fails we can fail the
1877                 // channel based on that, but stepping stuff here should be safe either way.
1878                 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
1879                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1880                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1881                 self.cur_remote_commitment_transaction_number -= 1;
1882                 self.received_commitment_while_awaiting_raa = false;
1883                 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
1884                         // This is a response to our post-monitor-failed unfreeze messages, so we can clear the
1885                         // monitor_pending_order requirement as we won't re-send the monitor_pending messages.
1886                         self.monitor_pending_order = None;
1887                 }
1888
1889                 let mut to_forward_infos = Vec::new();
1890                 let mut revoked_htlcs = Vec::new();
1891                 let mut update_fail_htlcs = Vec::new();
1892                 let mut update_fail_malformed_htlcs = Vec::new();
1893                 let mut require_commitment = false;
1894                 let mut value_to_self_msat_diff: i64 = 0;
1895                 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
1896                 self.pending_inbound_htlcs.retain(|htlc| {
1897                         if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
1898                                 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
1899                                         value_to_self_msat_diff += htlc.amount_msat as i64;
1900                                 }
1901                                 false
1902                         } else { true }
1903                 });
1904                 self.pending_outbound_htlcs.retain(|htlc| {
1905                         if let OutboundHTLCState::AwaitingRemovedRemoteRevoke = htlc.state {
1906                                 if let Some(reason) = htlc.fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
1907                                         revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
1908                                 } else {
1909                                         // They fulfilled, so we sent them money
1910                                         value_to_self_msat_diff -= htlc.amount_msat as i64;
1911                                 }
1912                                 false
1913                         } else { true }
1914                 });
1915                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1916                         let swap = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) = &htlc.state {
1917                                 true
1918                         } else if let &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) = &htlc.state {
1919                                 true
1920                         } else { false };
1921                         if swap {
1922                                 let mut state = InboundHTLCState::Committed;
1923                                 mem::swap(&mut state, &mut htlc.state);
1924
1925                                 if let InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info) = state {
1926                                         htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info);
1927                                         require_commitment = true;
1928                                 } else if let InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info) = state {
1929                                         match forward_info {
1930                                                 PendingHTLCStatus::Fail(fail_msg) => {
1931                                                         require_commitment = true;
1932                                                         match fail_msg {
1933                                                                 HTLCFailureMsg::Relay(msg) => {
1934                                                                         htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(msg.reason.clone()));
1935                                                                         update_fail_htlcs.push(msg)
1936                                                                 },
1937                                                                 HTLCFailureMsg::Malformed(msg) => {
1938                                                                         htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailMalformed((msg.sha256_of_onion, msg.failure_code)));
1939                                                                         update_fail_malformed_htlcs.push(msg)
1940                                                                 },
1941                                                         }
1942                                                 },
1943                                                 PendingHTLCStatus::Forward(forward_info) => {
1944                                                         to_forward_infos.push((forward_info, htlc.htlc_id));
1945                                                         htlc.state = InboundHTLCState::Committed;
1946                                                 }
1947                                         }
1948                                 }
1949                         }
1950                 }
1951                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1952                         if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
1953                                 htlc.state = OutboundHTLCState::Committed;
1954                         } else if let OutboundHTLCState::AwaitingRemoteRevokeToRemove = htlc.state {
1955                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
1956                                 require_commitment = true;
1957                         }
1958                 }
1959                 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
1960
1961                 if self.channel_outbound {
1962                         if let Some(feerate) = self.pending_update_fee.take() {
1963                                 self.feerate_per_kw = feerate;
1964                         }
1965                 } else {
1966                         if let Some(feerate) = self.pending_update_fee {
1967                                 // Because a node cannot send two commitment_signed's in a row without getting a
1968                                 // revoke_and_ack from us (as it would otherwise not know the per_commitment_point
1969                                 // it should use to create keys with) and because a node can't send a
1970                                 // commitment_signed without changes, checking if the feerate is equal to the
1971                                 // pending feerate update is sufficient to detect require_commitment.
1972                                 if feerate == self.feerate_per_kw {
1973                                         require_commitment = true;
1974                                         self.pending_update_fee = None;
1975                                 }
1976                         }
1977                 }
1978
1979                 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) == ChannelState::MonitorUpdateFailed as u32 {
1980                         // We can't actually generate a new commitment transaction (incl by freeing holding
1981                         // cells) while we can't update the monitor, so we just return what we have.
1982                         if require_commitment {
1983                                 self.monitor_pending_commitment_signed = true;
1984                         }
1985                         self.monitor_pending_forwards.append(&mut to_forward_infos);
1986                         self.monitor_pending_failures.append(&mut revoked_htlcs);
1987                         return Ok((None, Vec::new(), Vec::new(), self.channel_monitor.clone()));
1988                 }
1989
1990                 match self.free_holding_cell_htlcs()? {
1991                         Some(mut commitment_update) => {
1992                                 commitment_update.0.update_fail_htlcs.reserve(update_fail_htlcs.len());
1993                                 for fail_msg in update_fail_htlcs.drain(..) {
1994                                         commitment_update.0.update_fail_htlcs.push(fail_msg);
1995                                 }
1996                                 commitment_update.0.update_fail_malformed_htlcs.reserve(update_fail_malformed_htlcs.len());
1997                                 for fail_msg in update_fail_malformed_htlcs.drain(..) {
1998                                         commitment_update.0.update_fail_malformed_htlcs.push(fail_msg);
1999                                 }
2000                                 Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, commitment_update.1))
2001                         },
2002                         None => {
2003                                 if require_commitment {
2004                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2005                                         Ok((Some(msgs::CommitmentUpdate {
2006                                                 update_add_htlcs: Vec::new(),
2007                                                 update_fulfill_htlcs: Vec::new(),
2008                                                 update_fail_htlcs,
2009                                                 update_fail_malformed_htlcs,
2010                                                 update_fee: None,
2011                                                 commitment_signed
2012                                         }), to_forward_infos, revoked_htlcs, monitor_update))
2013                                 } else {
2014                                         Ok((None, to_forward_infos, revoked_htlcs, self.channel_monitor.clone()))
2015                                 }
2016                         }
2017                 }
2018
2019         }
2020
2021         /// Adds a pending update to this channel. See the doc for send_htlc for
2022         /// further details on the optionness of the return value.
2023         /// You MUST call send_commitment prior to any other calls on this Channel
2024         fn send_update_fee(&mut self, feerate_per_kw: u64) -> Option<msgs::UpdateFee> {
2025                 if !self.channel_outbound {
2026                         panic!("Cannot send fee from inbound channel");
2027                 }
2028                 if !self.is_usable() {
2029                         panic!("Cannot update fee until channel is fully established and we haven't started shutting down");
2030                 }
2031                 if !self.is_live() {
2032                         panic!("Cannot update fee while peer is disconnected/we're awaiting a monitor update (ChannelManager should have caught this)");
2033                 }
2034
2035                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2036                         self.holding_cell_update_fee = Some(feerate_per_kw);
2037                         return None;
2038                 }
2039
2040                 debug_assert!(self.pending_update_fee.is_none());
2041                 self.pending_update_fee = Some(feerate_per_kw);
2042
2043                 Some(msgs::UpdateFee {
2044                         channel_id: self.channel_id,
2045                         feerate_per_kw: feerate_per_kw as u32,
2046                 })
2047         }
2048
2049         pub fn send_update_fee_and_commit(&mut self, feerate_per_kw: u64) -> Result<Option<(msgs::UpdateFee, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
2050                 match self.send_update_fee(feerate_per_kw) {
2051                         Some(update_fee) => {
2052                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2053                                 Ok(Some((update_fee, commitment_signed, monitor_update)))
2054                         },
2055                         None => Ok(None)
2056                 }
2057         }
2058
2059         /// Removes any uncommitted HTLCs, to be used on peer disconnection, including any pending
2060         /// HTLCs that we intended to add but haven't as we were waiting on a remote revoke.
2061         /// Returns the set of PendingHTLCStatuses from remote uncommitted HTLCs (which we're
2062         /// implicitly dropping) and the payment_hashes of HTLCs we tried to add but are dropping.
2063         /// No further message handling calls may be made until a channel_reestablish dance has
2064         /// completed.
2065         pub fn remove_uncommitted_htlcs_and_mark_paused(&mut self) -> Vec<(HTLCSource, [u8; 32])> {
2066                 let mut outbound_drops = Vec::new();
2067
2068                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2069                 if self.channel_state < ChannelState::FundingSent as u32 {
2070                         self.channel_state = ChannelState::ShutdownComplete as u32;
2071                         return outbound_drops;
2072                 }
2073
2074                 let mut inbound_drop_count = 0;
2075                 self.pending_inbound_htlcs.retain(|htlc| {
2076                         match htlc.state {
2077                                 InboundHTLCState::RemoteAnnounced(_) => {
2078                                         // They sent us an update_add_htlc but we never got the commitment_signed.
2079                                         // We'll tell them what commitment_signed we're expecting next and they'll drop
2080                                         // this HTLC accordingly
2081                                         inbound_drop_count += 1;
2082                                         false
2083                                 },
2084                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_)|InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => {
2085                                         // We received a commitment_signed updating this HTLC and (at least hopefully)
2086                                         // sent a revoke_and_ack (which we can re-transmit) and have heard nothing
2087                                         // in response to it yet, so don't touch it.
2088                                         true
2089                                 },
2090                                 InboundHTLCState::Committed => true,
2091                                 InboundHTLCState::LocalRemoved(_) => {
2092                                         // We (hopefully) sent a commitment_signed updating this HTLC (which we can
2093                                         // re-transmit if needed) and they may have even sent a revoke_and_ack back
2094                                         // (that we missed). Keep this around for now and if they tell us they missed
2095                                         // the commitment_signed we can re-transmit the update then.
2096                                         true
2097                                 },
2098                         }
2099                 });
2100
2101                 for htlc in self.pending_outbound_htlcs.iter_mut() {
2102                         if let OutboundHTLCState::RemoteRemoved = htlc.state {
2103                                 // They sent us an update to remove this but haven't yet sent the corresponding
2104                                 // commitment_signed, we need to move it back to Committed and they can re-send
2105                                 // the update upon reconnection.
2106                                 htlc.state = OutboundHTLCState::Committed;
2107                         }
2108                 }
2109
2110                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2111                         match htlc_update {
2112                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2113                                         outbound_drops.push((source.clone(), payment_hash.clone()));
2114                                         false
2115                                 },
2116                                 &HTLCUpdateAwaitingACK::ClaimHTLC {..} | &HTLCUpdateAwaitingACK::FailHTLC {..} => true,
2117                         }
2118                 });
2119                 self.channel_state |= ChannelState::PeerDisconnected as u32;
2120                 log_debug!(self, "Peer disconnection resulted in {} remote-announced HTLC drops and {} waiting-to-locally-announced HTLC drops on channel {}", outbound_drops.len(), inbound_drop_count, log_bytes!(self.channel_id()));
2121                 outbound_drops
2122         }
2123
2124         /// Indicates that a ChannelMonitor update failed to be stored by the client and further
2125         /// updates are partially paused.
2126         /// This must be called immediately after the call which generated the ChannelMonitor update
2127         /// which failed, with the order argument set to the type of call it represented (ie a
2128         /// commitment update or a revoke_and_ack generation). The messages which were generated from
2129         /// that original call must *not* have been sent to the remote end, and must instead have been
2130         /// dropped. They will be regenerated when monitor_updating_restored is called.
2131         pub fn monitor_update_failed(&mut self, order: RAACommitmentOrder) {
2132                 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
2133                 match order {
2134                         RAACommitmentOrder::CommitmentFirst => {
2135                                 self.monitor_pending_revoke_and_ack = false;
2136                                 self.monitor_pending_commitment_signed = true;
2137                         },
2138                         RAACommitmentOrder::RevokeAndACKFirst => {
2139                                 self.monitor_pending_revoke_and_ack = true;
2140                                 self.monitor_pending_commitment_signed = false;
2141                         },
2142                 }
2143                 self.monitor_pending_order = Some(order);
2144                 self.channel_state |= ChannelState::MonitorUpdateFailed as u32;
2145         }
2146
2147         /// Indicates that the latest ChannelMonitor update has been committed by the client
2148         /// successfully and we should restore normal operation. Returns messages which should be sent
2149         /// to the remote side.
2150         pub fn monitor_updating_restored(&mut self) -> (Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, RAACommitmentOrder, Vec<(PendingForwardHTLCInfo, u64)>, Vec<(HTLCSource, [u8; 32], HTLCFailReason)>) {
2151                 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, ChannelState::MonitorUpdateFailed as u32);
2152                 self.channel_state &= !(ChannelState::MonitorUpdateFailed as u32);
2153
2154                 let mut forwards = Vec::new();
2155                 mem::swap(&mut forwards, &mut self.monitor_pending_forwards);
2156                 let mut failures = Vec::new();
2157                 mem::swap(&mut failures, &mut self.monitor_pending_failures);
2158
2159                 if self.channel_state & (ChannelState::PeerDisconnected as u32) != 0 {
2160                         // Leave monitor_pending_order so we can order our channel_reestablish responses
2161                         self.monitor_pending_revoke_and_ack = false;
2162                         self.monitor_pending_commitment_signed = false;
2163                         return (None, None, RAACommitmentOrder::RevokeAndACKFirst, forwards, failures);
2164                 }
2165
2166                 let raa = if self.monitor_pending_revoke_and_ack {
2167                         Some(self.get_last_revoke_and_ack())
2168                 } else { None };
2169                 let commitment_update = if self.monitor_pending_commitment_signed {
2170                         Some(self.get_last_commitment_update())
2171                 } else { None };
2172
2173                 self.monitor_pending_revoke_and_ack = false;
2174                 self.monitor_pending_commitment_signed = false;
2175                 (raa, commitment_update, self.monitor_pending_order.clone().unwrap(), forwards, failures)
2176         }
2177
2178         pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), ChannelError> {
2179                 if self.channel_outbound {
2180                         return Err(ChannelError::Close("Non-funding remote tried to update channel fee"));
2181                 }
2182                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2183                         return Err(ChannelError::Close("Peer sent update_fee when we needed a channel_reestablish"));
2184                 }
2185                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
2186
2187                 self.pending_update_fee = Some(msg.feerate_per_kw as u64);
2188                 self.channel_update_count += 1;
2189                 Ok(())
2190         }
2191
2192         fn get_last_revoke_and_ack(&self) -> msgs::RevokeAndACK {
2193                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number));
2194                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 2);
2195                 msgs::RevokeAndACK {
2196                         channel_id: self.channel_id,
2197                         per_commitment_secret,
2198                         next_per_commitment_point,
2199                 }
2200         }
2201
2202         fn get_last_commitment_update(&self) -> msgs::CommitmentUpdate {
2203                 let mut update_add_htlcs = Vec::new();
2204                 let mut update_fulfill_htlcs = Vec::new();
2205                 let mut update_fail_htlcs = Vec::new();
2206                 let mut update_fail_malformed_htlcs = Vec::new();
2207
2208                 for htlc in self.pending_outbound_htlcs.iter() {
2209                         if let &OutboundHTLCState::LocalAnnounced(ref onion_packet) = &htlc.state {
2210                                 update_add_htlcs.push(msgs::UpdateAddHTLC {
2211                                         channel_id: self.channel_id(),
2212                                         htlc_id: htlc.htlc_id,
2213                                         amount_msat: htlc.amount_msat,
2214                                         payment_hash: htlc.payment_hash,
2215                                         cltv_expiry: htlc.cltv_expiry,
2216                                         onion_routing_packet: (**onion_packet).clone(),
2217                                 });
2218                         }
2219                 }
2220
2221                 for htlc in self.pending_inbound_htlcs.iter() {
2222                         if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
2223                                 match reason {
2224                                         &InboundHTLCRemovalReason::FailRelay(ref err_packet) => {
2225                                                 update_fail_htlcs.push(msgs::UpdateFailHTLC {
2226                                                         channel_id: self.channel_id(),
2227                                                         htlc_id: htlc.htlc_id,
2228                                                         reason: err_packet.clone()
2229                                                 });
2230                                         },
2231                                         &InboundHTLCRemovalReason::FailMalformed((ref sha256_of_onion, ref failure_code)) => {
2232                                                 update_fail_malformed_htlcs.push(msgs::UpdateFailMalformedHTLC {
2233                                                         channel_id: self.channel_id(),
2234                                                         htlc_id: htlc.htlc_id,
2235                                                         sha256_of_onion: sha256_of_onion.clone(),
2236                                                         failure_code: failure_code.clone(),
2237                                                 });
2238                                         },
2239                                         &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
2240                                                 update_fulfill_htlcs.push(msgs::UpdateFulfillHTLC {
2241                                                         channel_id: self.channel_id(),
2242                                                         htlc_id: htlc.htlc_id,
2243                                                         payment_preimage: payment_preimage.clone(),
2244                                                 });
2245                                         },
2246                                 }
2247                         }
2248                 }
2249
2250                 msgs::CommitmentUpdate {
2251                         update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs,
2252                         update_fee: None, //TODO: We need to support re-generating any update_fees in the last commitment_signed!
2253                         commitment_signed: self.send_commitment_no_state_update().expect("It looks like we failed to re-generate a commitment_signed we had previously sent?").0,
2254                 }
2255         }
2256
2257         /// May panic if some calls other than message-handling calls (which will all Err immediately)
2258         /// have been called between remove_uncommitted_htlcs_and_mark_paused and this call.
2259         pub fn channel_reestablish(&mut self, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, Option<ChannelMonitor>, RAACommitmentOrder), ChannelError> {
2260                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == 0 {
2261                         // While BOLT 2 doesn't indicate explicitly we should error this channel here, it
2262                         // almost certainly indicates we are going to end up out-of-sync in some way, so we
2263                         // just close here instead of trying to recover.
2264                         return Err(ChannelError::Close("Peer sent a loose channel_reestablish not after reconnect"));
2265                 }
2266
2267                 if msg.next_local_commitment_number == 0 || msg.next_local_commitment_number >= INITIAL_COMMITMENT_NUMBER ||
2268                                 msg.next_remote_commitment_number == 0 || msg.next_remote_commitment_number >= INITIAL_COMMITMENT_NUMBER {
2269                         return Err(ChannelError::Close("Peer sent a garbage channel_reestablish"));
2270                 }
2271
2272                 // Go ahead and unmark PeerDisconnected as various calls we may make check for it (and all
2273                 // remaining cases either succeed or ErrorMessage-fail).
2274                 self.channel_state &= !(ChannelState::PeerDisconnected as u32);
2275
2276                 let required_revoke = if msg.next_remote_commitment_number == INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number {
2277                         // Remote isn't waiting on any RevokeAndACK from us!
2278                         // Note that if we need to repeat our FundingLocked we'll do that in the next if block.
2279                         None
2280                 } else if msg.next_remote_commitment_number == (INITIAL_COMMITMENT_NUMBER - 1) - self.cur_local_commitment_transaction_number {
2281                         if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2282                                 self.monitor_pending_revoke_and_ack = true;
2283                                 None
2284                         } else {
2285                                 Some(self.get_last_revoke_and_ack())
2286                         }
2287                 } else {
2288                         return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old local commitment transaction"));
2289                 };
2290
2291                 // We increment cur_remote_commitment_transaction_number only upon receipt of
2292                 // revoke_and_ack, not on sending commitment_signed, so we add one if have
2293                 // AwaitingRemoteRevoke set, which indicates we sent a commitment_signed but haven't gotten
2294                 // the corresponding revoke_and_ack back yet.
2295                 let our_next_remote_commitment_number = INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number + if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 };
2296
2297                 let resend_funding_locked = if msg.next_local_commitment_number == 1 && INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number == 1 {
2298                         // We should never have to worry about MonitorUpdateFailed resending FundingLocked
2299                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2300                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2301                         Some(msgs::FundingLocked {
2302                                 channel_id: self.channel_id(),
2303                                 next_per_commitment_point: next_per_commitment_point,
2304                         })
2305                 } else { None };
2306
2307                 let order = self.monitor_pending_order.clone().unwrap_or(if self.received_commitment_while_awaiting_raa {
2308                                 RAACommitmentOrder::CommitmentFirst
2309                         } else {
2310                                 RAACommitmentOrder::RevokeAndACKFirst
2311                         });
2312
2313                 if msg.next_local_commitment_number == our_next_remote_commitment_number {
2314                         if required_revoke.is_some() {
2315                                 log_debug!(self, "Reconnected channel {} with only lost outbound RAA", log_bytes!(self.channel_id()));
2316                         } else {
2317                                 log_debug!(self, "Reconnected channel {} with no loss", log_bytes!(self.channel_id()));
2318                         }
2319
2320                         if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) == 0 &&
2321                                         self.monitor_pending_order.is_none() { // monitor_pending_order indicates we're waiting on a response to a unfreeze
2322                                 // We're up-to-date and not waiting on a remote revoke (if we are our
2323                                 // channel_reestablish should result in them sending a revoke_and_ack), but we may
2324                                 // have received some updates while we were disconnected. Free the holding cell
2325                                 // now!
2326                                 match self.free_holding_cell_htlcs() {
2327                                         Err(e) => {
2328                                                 if let &Some(msgs::ErrorAction::DisconnectPeer{msg: Some(_)}) = &e.action {
2329                                                         return Err(ChannelError::Close(e.err));
2330                                                 } else if let &Some(msgs::ErrorAction::SendErrorMessage{msg: _}) = &e.action {
2331                                                         return Err(ChannelError::Close(e.err));
2332                                                 } else {
2333                                                         panic!("Got non-channel-failing result from free_holding_cell_htlcs");
2334                                                 }
2335                                         },
2336                                         Ok(Some((commitment_update, channel_monitor))) => return Ok((resend_funding_locked, required_revoke, Some(commitment_update), Some(channel_monitor), order)),
2337                                         Ok(None) => return Ok((resend_funding_locked, required_revoke, None, None, order)),
2338                                 }
2339                         } else {
2340                                 return Ok((resend_funding_locked, required_revoke, None, None, order));
2341                         }
2342                 } else if msg.next_local_commitment_number == our_next_remote_commitment_number - 1 {
2343                         if required_revoke.is_some() {
2344                                 log_debug!(self, "Reconnected channel {} with lost outbound RAA and lost remote commitment tx", log_bytes!(self.channel_id()));
2345                         } else {
2346                                 log_debug!(self, "Reconnected channel {} with only lost remote commitment tx", log_bytes!(self.channel_id()));
2347                         }
2348
2349                         // If monitor_pending_order is set, it must be CommitmentSigned if we have no RAA
2350                         debug_assert!(self.monitor_pending_order != Some(RAACommitmentOrder::RevokeAndACKFirst) || required_revoke.is_some());
2351
2352                         if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2353                                 self.monitor_pending_commitment_signed = true;
2354                                 return Ok((resend_funding_locked, None, None, None, order));
2355                         }
2356
2357                         return Ok((resend_funding_locked, required_revoke, Some(self.get_last_commitment_update()), None, order));
2358                 } else {
2359                         return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old remote commitment transaction"));
2360                 }
2361         }
2362
2363         pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, [u8; 32])>), HandleError> {
2364                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2365                         return Err(HandleError{err: "Peer sent shutdown when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent shutdown when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
2366                 }
2367                 if self.channel_state < ChannelState::FundingSent as u32 {
2368                         self.channel_state = ChannelState::ShutdownComplete as u32;
2369                         self.channel_update_count += 1;
2370                         return Ok((None, None, Vec::new()));
2371                 }
2372                 for htlc in self.pending_inbound_htlcs.iter() {
2373                         if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
2374                                 return Err(HandleError{err: "Got shutdown with remote pending HTLCs", action: None});
2375                         }
2376                 }
2377                 if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
2378                         return Err(HandleError{err: "Remote peer sent duplicate shutdown message", action: None});
2379                 }
2380                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2381
2382                 // BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
2383                 // 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
2384                 if self.channel_outbound && msg.scriptpubkey.len() > 34 {
2385                         return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", action: None});
2386                 }
2387
2388                 //Check shutdown_scriptpubkey form as BOLT says we must
2389                 if !(msg.scriptpubkey.is_p2pkh()) && !(msg.scriptpubkey.is_p2sh())
2390                         && !(msg.scriptpubkey.is_v0_p2wpkh()) && !(msg.scriptpubkey.is_v0_p2wsh()){
2391                         return Err(HandleError{err: "Got an invalid scriptpubkey from remote peer", action: Some(msgs::ErrorAction::DisconnectPeer{ msg: None })});
2392                 }
2393
2394                 if self.their_shutdown_scriptpubkey.is_some() {
2395                         if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
2396                                 return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", action: None});
2397                         }
2398                 } else {
2399                         self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
2400                 }
2401
2402                 let our_closing_script = self.get_closing_scriptpubkey();
2403
2404                 let (proposed_feerate, proposed_fee, our_sig) = if self.channel_outbound && self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() {
2405                         let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2406                         if self.feerate_per_kw > proposed_feerate {
2407                                 proposed_feerate = self.feerate_per_kw;
2408                         }
2409                         let tx_weight = Self::get_closing_transaction_weight(&our_closing_script, &msg.scriptpubkey);
2410                         let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 1000;
2411
2412                         let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
2413                         let funding_redeemscript = self.get_funding_redeemscript();
2414                         let sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2415
2416                         (Some(proposed_feerate), Some(total_fee_satoshis), Some(self.secp_ctx.sign(&sighash, &self.local_keys.funding_key)))
2417                 } else { (None, None, None) };
2418
2419                 // From here on out, we may not fail!
2420
2421                 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
2422                 self.channel_update_count += 1;
2423
2424                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2425                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2426                 // cell HTLCs and return them to fail the payment.
2427                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2428                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2429                         match htlc_update {
2430                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2431                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
2432                                         false
2433                                 },
2434                                 _ => true
2435                         }
2436                 });
2437                 for htlc in self.pending_outbound_htlcs.iter() {
2438                         if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
2439                                 return Ok((None, None, dropped_outbound_htlcs));
2440                         }
2441                 }
2442
2443                 let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
2444                         None
2445                 } else {
2446                         Some(msgs::Shutdown {
2447                                 channel_id: self.channel_id,
2448                                 scriptpubkey: our_closing_script,
2449                         })
2450                 };
2451
2452                 self.channel_state |= ChannelState::LocalShutdownSent as u32;
2453                 self.channel_update_count += 1;
2454                 if self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() && self.channel_outbound {
2455                         // There are no more HTLCs and we're the funder, this means we start the closing_signed
2456                         // dance with an initial fee proposal!
2457                         self.last_sent_closing_fee = Some((proposed_feerate.unwrap(), proposed_fee.unwrap()));
2458                         Ok((our_shutdown, Some(msgs::ClosingSigned {
2459                                 channel_id: self.channel_id,
2460                                 fee_satoshis: proposed_fee.unwrap(),
2461                                 signature: our_sig.unwrap(),
2462                         }), dropped_outbound_htlcs))
2463                 } else {
2464                         Ok((our_shutdown, None, dropped_outbound_htlcs))
2465                 }
2466         }
2467
2468         pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), HandleError> {
2469                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
2470                         return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", action: None});
2471                 }
2472                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2473                         return Err(HandleError{err: "Peer sent closing_signed when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent closing_signed when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
2474                 }
2475                 if !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() {
2476                         return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", action: None});
2477                 }
2478                 if msg.fee_satoshis > 21000000 * 10000000 { //this is required to stop potential overflow in build_closing_transaction
2479                         return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", action: None});
2480                 }
2481
2482                 let funding_redeemscript = self.get_funding_redeemscript();
2483                 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
2484                 if used_total_fee != msg.fee_satoshis {
2485                         return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", action: None});
2486                 }
2487                 let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2488
2489                 match self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()) {
2490                         Ok(_) => {},
2491                         Err(_e) => {
2492                                 // The remote end may have decided to revoke their output due to inconsistent dust
2493                                 // limits, so check for that case by re-checking the signature here.
2494                                 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
2495                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2496                                 secp_call!(self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid closing tx signature from peer", self.channel_id());
2497                         },
2498                 };
2499
2500                 if let Some((_, last_fee)) = self.last_sent_closing_fee {
2501                         if last_fee == msg.fee_satoshis {
2502                                 self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
2503                                 self.channel_state = ChannelState::ShutdownComplete as u32;
2504                                 self.channel_update_count += 1;
2505                                 return Ok((None, Some(closing_tx)));
2506                         }
2507                 }
2508
2509                 macro_rules! propose_new_feerate {
2510                         ($new_feerate: expr) => {
2511                                 let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
2512                                 let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 1000, false);
2513                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2514                                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
2515                                 self.last_sent_closing_fee = Some(($new_feerate, used_total_fee));
2516                                 return Ok((Some(msgs::ClosingSigned {
2517                                         channel_id: self.channel_id,
2518                                         fee_satoshis: used_total_fee,
2519                                         signature: our_sig,
2520                                 }), None))
2521                         }
2522                 }
2523
2524                 let proposed_sat_per_kw = msg.fee_satoshis * 1000 / closing_tx.get_weight();
2525                 if self.channel_outbound {
2526                         let our_max_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
2527                         if proposed_sat_per_kw > our_max_feerate {
2528                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
2529                                         if our_max_feerate <= last_feerate {
2530                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", action: None});
2531                                         }
2532                                 }
2533                                 propose_new_feerate!(our_max_feerate);
2534                         }
2535                 } else {
2536                         let our_min_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2537                         if proposed_sat_per_kw < our_min_feerate {
2538                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
2539                                         if our_min_feerate >= last_feerate {
2540                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", action: None});
2541                                         }
2542                                 }
2543                                 propose_new_feerate!(our_min_feerate);
2544                         }
2545                 }
2546
2547                 let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
2548                 self.channel_state = ChannelState::ShutdownComplete as u32;
2549                 self.channel_update_count += 1;
2550
2551                 Ok((Some(msgs::ClosingSigned {
2552                         channel_id: self.channel_id,
2553                         fee_satoshis: msg.fee_satoshis,
2554                         signature: our_sig,
2555                 }), Some(closing_tx)))
2556         }
2557
2558         // Public utilities:
2559
2560         pub fn channel_id(&self) -> [u8; 32] {
2561                 self.channel_id
2562         }
2563
2564         /// Gets the "user_id" value passed into the construction of this channel. It has no special
2565         /// meaning and exists only to allow users to have a persistent identifier of a channel.
2566         pub fn get_user_id(&self) -> u64 {
2567                 self.user_id
2568         }
2569
2570         /// May only be called after funding has been initiated (ie is_funding_initiated() is true)
2571         pub fn channel_monitor(&self) -> ChannelMonitor {
2572                 if self.channel_state < ChannelState::FundingCreated as u32 {
2573                         panic!("Can't get a channel monitor until funding has been created");
2574                 }
2575                 self.channel_monitor.clone()
2576         }
2577
2578         /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
2579         /// is_usable() returns true).
2580         /// Allowed in any state (including after shutdown)
2581         pub fn get_short_channel_id(&self) -> Option<u64> {
2582                 self.short_channel_id
2583         }
2584
2585         /// Returns the funding_txo we either got from our peer, or were given by
2586         /// get_outbound_funding_created.
2587         pub fn get_funding_txo(&self) -> Option<OutPoint> {
2588                 self.channel_monitor.get_funding_txo()
2589         }
2590
2591         /// Allowed in any state (including after shutdown)
2592         pub fn get_their_node_id(&self) -> PublicKey {
2593                 self.their_node_id
2594         }
2595
2596         /// Allowed in any state (including after shutdown)
2597         pub fn get_our_htlc_minimum_msat(&self) -> u64 {
2598                 self.our_htlc_minimum_msat
2599         }
2600
2601         /// Allowed in any state (including after shutdown)
2602         pub fn get_their_htlc_minimum_msat(&self) -> u64 {
2603                 self.our_htlc_minimum_msat
2604         }
2605
2606         pub fn get_value_satoshis(&self) -> u64 {
2607                 self.channel_value_satoshis
2608         }
2609
2610         #[cfg(test)]
2611         pub fn get_feerate(&self) -> u64 {
2612                 self.feerate_per_kw
2613         }
2614
2615         //TODO: Testing purpose only, should be changed in another way after #81
2616         #[cfg(test)]
2617         pub fn get_local_keys(&self) -> &ChannelKeys {
2618                 &self.local_keys
2619         }
2620
2621         #[cfg(test)]
2622         pub fn get_value_stat(&self) -> ChannelValueStat {
2623                 ChannelValueStat {
2624                         value_to_self_msat: self.value_to_self_msat,
2625                         channel_value_msat: self.channel_value_satoshis * 1000,
2626                         channel_reserve_msat: self.their_channel_reserve_satoshis * 1000,
2627                         pending_outbound_htlcs_amount_msat: self.pending_outbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
2628                         pending_inbound_htlcs_amount_msat: self.pending_inbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
2629                         holding_cell_outbound_amount_msat: {
2630                                 let mut res = 0;
2631                                 for h in self.holding_cell_htlc_updates.iter() {
2632                                         match h {
2633                                                 &HTLCUpdateAwaitingACK::AddHTLC{amount_msat, .. } => {
2634                                                         res += amount_msat;
2635                                                 }
2636                                                 _ => {}
2637                                         }
2638                                 }
2639                                 res
2640                         },
2641                         their_max_htlc_value_in_flight_msat: self.their_max_htlc_value_in_flight_msat,
2642                 }
2643         }
2644
2645         /// Allowed in any state (including after shutdown)
2646         pub fn get_channel_update_count(&self) -> u32 {
2647                 self.channel_update_count
2648         }
2649
2650         pub fn should_announce(&self) -> bool {
2651                 self.announce_publicly
2652         }
2653
2654         pub fn is_outbound(&self) -> bool {
2655                 self.channel_outbound
2656         }
2657
2658         /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
2659         /// Allowed in any state (including after shutdown)
2660         pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
2661                 // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
2662                 // output value back into a transaction with the regular channel output:
2663
2664                 // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
2665                 let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT) / 1000;
2666
2667                 if self.channel_outbound {
2668                         // + the marginal fee increase cost to us in the commitment transaction:
2669                         res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC / 1000;
2670                 }
2671
2672                 // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
2673                 res += fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT / 1000;
2674
2675                 res as u32
2676         }
2677
2678         /// Returns true if we've ever received a message from the remote end for this Channel
2679         pub fn have_received_message(&self) -> bool {
2680                 self.channel_state > (ChannelState::OurInitSent as u32)
2681         }
2682
2683         /// Returns true if this channel is fully established and not known to be closing.
2684         /// Allowed in any state (including after shutdown)
2685         pub fn is_usable(&self) -> bool {
2686                 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
2687                 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
2688         }
2689
2690         /// Returns true if this channel is currently available for use. This is a superset of
2691         /// is_usable() and considers things like the channel being temporarily disabled.
2692         /// Allowed in any state (including after shutdown)
2693         pub fn is_live(&self) -> bool {
2694                 self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) == 0)
2695         }
2696
2697         /// Returns true if this channel has been marked as awaiting a monitor update to move forward.
2698         /// Allowed in any state (including after shutdown)
2699         pub fn is_awaiting_monitor_update(&self) -> bool {
2700                 (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0
2701         }
2702
2703         /// Returns true if funding_created was sent/received.
2704         pub fn is_funding_initiated(&self) -> bool {
2705                 self.channel_state >= ChannelState::FundingCreated as u32
2706         }
2707
2708         /// Returns true if this channel is fully shut down. True here implies that no further actions
2709         /// may/will be taken on this channel, and thus this object should be freed. Any future changes
2710         /// will be handled appropriately by the chain monitor.
2711         pub fn is_shutdown(&self) -> bool {
2712                 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32  {
2713                         assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
2714                         true
2715                 } else { false }
2716         }
2717
2718         /// Called by channelmanager based on chain blocks being connected.
2719         /// Note that we only need to use this to detect funding_signed, anything else is handled by
2720         /// the channel_monitor.
2721         /// In case of Err, the channel may have been closed, at which point the standard requirements
2722         /// apply - no calls may be made except those explicitly stated to be allowed post-shutdown.
2723         /// Only returns an ErrorAction of DisconnectPeer, if Err.
2724         pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Result<Option<msgs::FundingLocked>, HandleError> {
2725                 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
2726                 if self.funding_tx_confirmations > 0 {
2727                         if header.bitcoin_hash() != self.last_block_connected {
2728                                 self.last_block_connected = header.bitcoin_hash();
2729                                 self.funding_tx_confirmations += 1;
2730                                 if self.funding_tx_confirmations == Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat) as u64 {
2731                                         let need_commitment_update = if non_shutdown_state == ChannelState::FundingSent as u32 {
2732                                                 self.channel_state |= ChannelState::OurFundingLocked as u32;
2733                                                 true
2734                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
2735                                                 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
2736                                                 self.channel_update_count += 1;
2737                                                 true
2738                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
2739                                                 // We got a reorg but not enough to trigger a force close, just update
2740                                                 // funding_tx_confirmed_in and return.
2741                                                 false
2742                                         } else if self.channel_state < ChannelState::ChannelFunded as u32 {
2743                                                 panic!("Started confirming a channel in a state pre-FundingSent?: {}", self.channel_state);
2744                                         } else {
2745                                                 // We got a reorg but not enough to trigger a force close, just update
2746                                                 // funding_tx_confirmed_in and return.
2747                                                 false
2748                                         };
2749                                         self.funding_tx_confirmed_in = Some(header.bitcoin_hash());
2750
2751                                         //TODO: Note that this must be a duplicate of the previous commitment point they sent us,
2752                                         //as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
2753                                         //they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
2754                                         //a protocol oversight, but I assume I'm just missing something.
2755                                         if need_commitment_update {
2756                                                 let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2757                                                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2758                                                 return Ok(Some(msgs::FundingLocked {
2759                                                         channel_id: self.channel_id,
2760                                                         next_per_commitment_point: next_per_commitment_point,
2761                                                 }));
2762                                         }
2763                                 }
2764                         }
2765                 }
2766                 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
2767                         for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
2768                                 if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().txid {
2769                                         let txo_idx = self.channel_monitor.get_funding_txo().unwrap().index as usize;
2770                                         if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
2771                                                         tx.output[txo_idx].value != self.channel_value_satoshis {
2772                                                 if self.channel_outbound {
2773                                                         // If we generated the funding transaction and it doesn't match what it
2774                                                         // should, the client is really broken and we should just panic and
2775                                                         // tell them off. That said, because hash collisions happen with high
2776                                                         // probability in fuzztarget mode, if we're fuzzing we just close the
2777                                                         // channel and move on.
2778                                                         #[cfg(not(feature = "fuzztarget"))]
2779                                                         panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
2780                                                 }
2781                                                 self.channel_state = ChannelState::ShutdownComplete as u32;
2782                                                 self.channel_update_count += 1;
2783                                                 return Err(HandleError{err: "funding tx had wrong script/value", action: Some(ErrorAction::DisconnectPeer{msg: None})});
2784                                         } else {
2785                                                 self.funding_tx_confirmations = 1;
2786                                                 self.short_channel_id = Some(((height as u64)          << (5*8)) |
2787                                                                              ((*index_in_block as u64) << (2*8)) |
2788                                                                              ((txo_idx as u64)         << (0*8)));
2789                                         }
2790                                 }
2791                         }
2792                 }
2793                 Ok(None)
2794         }
2795
2796         /// Called by channelmanager based on chain blocks being disconnected.
2797         /// Returns true if we need to close the channel now due to funding transaction
2798         /// unconfirmation/reorg.
2799         pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
2800                 if self.funding_tx_confirmations > 0 {
2801                         self.funding_tx_confirmations -= 1;
2802                         if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
2803                                 return true;
2804                         }
2805                 }
2806                 if Some(header.bitcoin_hash()) == self.funding_tx_confirmed_in {
2807                         self.funding_tx_confirmations = Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat) as u64 - 1;
2808                 }
2809                 false
2810         }
2811
2812         // Methods to get unprompted messages to send to the remote end (or where we already returned
2813         // something in the handler for the message that prompted this message):
2814
2815         pub fn get_open_channel(&self, chain_hash: Sha256dHash, fee_estimator: &FeeEstimator) -> msgs::OpenChannel {
2816                 if !self.channel_outbound {
2817                         panic!("Tried to open a channel for an inbound channel?");
2818                 }
2819                 if self.channel_state != ChannelState::OurInitSent as u32 {
2820                         panic!("Cannot generate an open_channel after we've moved forward");
2821                 }
2822
2823                 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2824                         panic!("Tried to send an open_channel for a channel that has already advanced");
2825                 }
2826
2827                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2828
2829                 msgs::OpenChannel {
2830                         chain_hash: chain_hash,
2831                         temporary_channel_id: self.channel_id,
2832                         funding_satoshis: self.channel_value_satoshis,
2833                         push_msat: self.channel_value_satoshis * 1000 - self.value_to_self_msat,
2834                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2835                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2836                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2837                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2838                         feerate_per_kw: fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) as u32,
2839                         to_self_delay: BREAKDOWN_TIMEOUT,
2840                         max_accepted_htlcs: OUR_MAX_HTLCS,
2841                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2842                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2843                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2844                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2845                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2846                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2847                         channel_flags: if self.announce_publicly {1} else {0},
2848                         shutdown_scriptpubkey: None,
2849                 }
2850         }
2851
2852         pub fn get_accept_channel(&self) -> msgs::AcceptChannel {
2853                 if self.channel_outbound {
2854                         panic!("Tried to send accept_channel for an outbound channel?");
2855                 }
2856                 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
2857                         panic!("Tried to send accept_channel after channel had moved forward");
2858                 }
2859                 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2860                         panic!("Tried to send an accept_channel for a channel that has already advanced");
2861                 }
2862
2863                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2864
2865                 msgs::AcceptChannel {
2866                         temporary_channel_id: self.channel_id,
2867                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2868                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2869                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2870                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2871                         minimum_depth: Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat),
2872                         to_self_delay: BREAKDOWN_TIMEOUT,
2873                         max_accepted_htlcs: OUR_MAX_HTLCS,
2874                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2875                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2876                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2877                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2878                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2879                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2880                         shutdown_scriptpubkey: None,
2881                 }
2882         }
2883
2884         fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), HandleError> {
2885                 let funding_script = self.get_funding_redeemscript();
2886
2887                 let remote_keys = self.build_remote_transaction_keys()?;
2888                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false, self.feerate_per_kw).0;
2889                 let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_initial_commitment_tx).sighash_all(&remote_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
2890
2891                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
2892                 Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key), remote_initial_commitment_tx))
2893         }
2894
2895         /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
2896         /// a funding_created message for the remote peer.
2897         /// Panics if called at some time other than immediately after initial handshake, if called twice,
2898         /// or if called on an inbound channel.
2899         /// Note that channel_id changes during this call!
2900         /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
2901         pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor), HandleError> {
2902                 if !self.channel_outbound {
2903                         panic!("Tried to create outbound funding_created message on an inbound channel!");
2904                 }
2905                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
2906                         panic!("Tried to get a funding_created messsage at a time other than immediately after initial handshake completion (or tried to get funding_created twice)");
2907                 }
2908                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
2909                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
2910                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2911                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
2912                 }
2913
2914                 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
2915                 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
2916
2917                 let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
2918                         Ok(res) => res,
2919                         Err(e) => {
2920                                 log_error!(self, "Got bad signatures: {}!", e.err);
2921                                 self.channel_monitor.unset_funding_info();
2922                                 return Err(e);
2923                         }
2924                 };
2925
2926                 let temporary_channel_id = self.channel_id;
2927
2928                 // Now that we're past error-generating stuff, update our local state:
2929                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
2930                 self.channel_state = ChannelState::FundingCreated as u32;
2931                 self.channel_id = funding_txo.to_channel_id();
2932                 self.cur_remote_commitment_transaction_number -= 1;
2933
2934                 Ok((msgs::FundingCreated {
2935                         temporary_channel_id: temporary_channel_id,
2936                         funding_txid: funding_txo.txid,
2937                         funding_output_index: funding_txo.index,
2938                         signature: our_signature
2939                 }, self.channel_monitor.clone()))
2940         }
2941
2942         /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
2943         /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
2944         /// available for use (have exchanged FundingLocked messages in both directions). Should be used
2945         /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
2946         /// Will only fail if we're not in a state where channel_announcement may be sent (including
2947         /// closing).
2948         /// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
2949         /// https://github.com/lightningnetwork/lightning-rfc/issues/468
2950         pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), ChannelError> {
2951                 if !self.announce_publicly {
2952                         return Err(ChannelError::Ignore("Channel is not available for public announcements"));
2953                 }
2954                 if self.channel_state & (ChannelState::ChannelFunded as u32) == 0 {
2955                         return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement until the channel funding has been locked"));
2956                 }
2957                 if (self.channel_state & (ChannelState::LocalShutdownSent as u32 | ChannelState::ShutdownComplete as u32)) != 0 {
2958                         return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement once the channel is closing"));
2959                 }
2960
2961                 let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
2962                 let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key);
2963
2964                 let msg = msgs::UnsignedChannelAnnouncement {
2965                         features: msgs::GlobalFeatures::new(),
2966                         chain_hash: chain_hash,
2967                         short_channel_id: self.get_short_channel_id().unwrap(),
2968                         node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
2969                         node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
2970                         bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey.unwrap() },
2971                         bitcoin_key_2: if were_node_one { self.their_funding_pubkey.unwrap() } else { our_bitcoin_key },
2972                         excess_data: Vec::new(),
2973                 };
2974
2975                 let msghash = Message::from_slice(&Sha256dHash::from_data(&msg.encode()[..])[..]).unwrap();
2976                 let sig = self.secp_ctx.sign(&msghash, &self.local_keys.funding_key);
2977
2978                 Ok((msg, sig))
2979         }
2980
2981         /// May panic if called on a channel that wasn't immediately-previously
2982         /// self.remove_uncommitted_htlcs_and_mark_paused()'d
2983         pub fn get_channel_reestablish(&self) -> msgs::ChannelReestablish {
2984                 assert_eq!(self.channel_state & ChannelState::PeerDisconnected as u32, ChannelState::PeerDisconnected as u32);
2985                 msgs::ChannelReestablish {
2986                         channel_id: self.channel_id(),
2987                         next_local_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number,
2988                         next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number,
2989                         data_loss_protect: None,
2990                 }
2991         }
2992
2993
2994         // Send stuff to our remote peers:
2995
2996         /// Adds a pending outbound HTLC to this channel, note that you probably want
2997         /// send_htlc_and_commit instead cause you'll want both messages at once.
2998         /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
2999         /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
3000         /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
3001         /// You MUST call send_commitment prior to any other calls on this Channel
3002         pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, HandleError> {
3003                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
3004                         return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", action: None});
3005                 }
3006
3007                 if amount_msat > self.channel_value_satoshis * 1000 {
3008                         return Err(HandleError{err: "Cannot send more than the total value of the channel", action: None});
3009                 }
3010                 if amount_msat < self.their_htlc_minimum_msat {
3011                         return Err(HandleError{err: "Cannot send less than their minimum HTLC value", action: None});
3012                 }
3013
3014                 if (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
3015                         // Note that this should never really happen, if we're !is_live() on receipt of an
3016                         // incoming HTLC for relay will result in us rejecting the HTLC and we won't allow
3017                         // the user to send directly into a !is_live() channel. However, if we
3018                         // disconnected during the time the previous hop was doing the commitment dance we may
3019                         // end up getting here after the forwarding delay. In any case, returning an
3020                         // IgnoreError will get ChannelManager to do the right thing and fail backwards now.
3021                         return Err(HandleError{err: "Cannot send an HTLC while disconnected/frozen for channel monitor update", action: Some(ErrorAction::IgnoreError)});
3022                 }
3023
3024                 let (outbound_htlc_count, htlc_outbound_value_msat) = self.get_outbound_pending_htlc_stats();
3025                 if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
3026                         return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", action: None});
3027                 }
3028                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
3029                 // Check their_max_htlc_value_in_flight_msat
3030                 if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
3031                         return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", action: None});
3032                 }
3033
3034                 let mut holding_cell_outbound_amount_msat = 0;
3035                 for holding_htlc in self.holding_cell_htlc_updates.iter() {
3036                         match holding_htlc {
3037                                 &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, .. } => {
3038                                         holding_cell_outbound_amount_msat += *amount_msat;
3039                                 }
3040                                 _ => {}
3041                         }
3042                 }
3043
3044                 // Check self.their_channel_reserve_satoshis (the amount we must keep as
3045                 // reserve for them to have something to claim if we misbehave)
3046                 if self.value_to_self_msat < self.their_channel_reserve_satoshis * 1000 + amount_msat + holding_cell_outbound_amount_msat + htlc_outbound_value_msat {
3047                         return Err(HandleError{err: "Cannot send value that would put us over our reserve value", action: None});
3048                 }
3049
3050                 //TODO: Check cltv_expiry? Do this in channel manager?
3051
3052                 // Now update local state:
3053                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
3054                         //TODO: Check the limits *including* other pending holding cell HTLCs!
3055                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
3056                                 amount_msat: amount_msat,
3057                                 payment_hash: payment_hash,
3058                                 cltv_expiry: cltv_expiry,
3059                                 source,
3060                                 onion_routing_packet: onion_routing_packet,
3061                                 time_created: Instant::now(),
3062                         });
3063                         return Ok(None);
3064                 }
3065
3066                 self.pending_outbound_htlcs.push(OutboundHTLCOutput {
3067                         htlc_id: self.next_local_htlc_id,
3068                         amount_msat: amount_msat,
3069                         payment_hash: payment_hash.clone(),
3070                         cltv_expiry: cltv_expiry,
3071                         state: OutboundHTLCState::LocalAnnounced(Box::new(onion_routing_packet.clone())),
3072                         source,
3073                         fail_reason: None,
3074                 });
3075
3076                 let res = msgs::UpdateAddHTLC {
3077                         channel_id: self.channel_id,
3078                         htlc_id: self.next_local_htlc_id,
3079                         amount_msat: amount_msat,
3080                         payment_hash: payment_hash,
3081                         cltv_expiry: cltv_expiry,
3082                         onion_routing_packet: onion_routing_packet,
3083                 };
3084                 self.next_local_htlc_id += 1;
3085
3086                 Ok(Some(res))
3087         }
3088
3089         /// Creates a signed commitment transaction to send to the remote peer.
3090         /// Always returns a Channel-failing HandleError::action if an immediately-preceding (read: the
3091         /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
3092         /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
3093         pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
3094                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
3095                         panic!("Cannot create commitment tx until channel is fully established");
3096                 }
3097                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
3098                         panic!("Cannot create commitment tx until remote revokes their previous commitment");
3099                 }
3100                 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) == (ChannelState::PeerDisconnected as u32) {
3101                         panic!("Cannot create commitment tx while disconnected, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
3102                 }
3103                 if (self.channel_state & (ChannelState::MonitorUpdateFailed as u32)) == (ChannelState::PeerDisconnected as u32) {
3104                         panic!("Cannot create commitment tx while awaiting monitor update unfreeze, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
3105                 }
3106                 let mut have_updates = self.pending_update_fee.is_some();
3107                 for htlc in self.pending_outbound_htlcs.iter() {
3108                         if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
3109                                 have_updates = true;
3110                         }
3111                         if have_updates { break; }
3112                 }
3113                 if !have_updates {
3114                         panic!("Cannot create commitment tx until we have some updates to send");
3115                 }
3116                 self.send_commitment_no_status_check()
3117         }
3118         /// Only fails in case of bad keys
3119         fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
3120                 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
3121                 // fail to generate this, we still are at least at a position where upgrading their status
3122                 // is acceptable.
3123                 for htlc in self.pending_inbound_htlcs.iter_mut() {
3124                         let new_state = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref forward_info) = &htlc.state {
3125                                 Some(InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info.clone()))
3126                         } else { None };
3127                         if let Some(state) = new_state {
3128                                 htlc.state = state;
3129                         }
3130                 }
3131                 for htlc in self.pending_outbound_htlcs.iter_mut() {
3132                         if let OutboundHTLCState::AwaitingRemoteRevokeToRemove = htlc.state {
3133                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
3134                         }
3135                 }
3136
3137                 match self.send_commitment_no_state_update() {
3138                         Ok((res, remote_commitment_tx)) => {
3139                                 // Update state now that we've passed all the can-fail calls...
3140                                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1, self.cur_remote_commitment_transaction_number);
3141                                 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
3142                                 Ok((res, self.channel_monitor.clone()))
3143                         },
3144                         Err(e) => Err(e),
3145                 }
3146         }
3147
3148         /// Only fails in case of bad keys. Used for channel_reestablish commitment_signed generation
3149         /// when we shouldn't change HTLC/channel state.
3150         fn send_commitment_no_state_update(&self) -> Result<(msgs::CommitmentSigned, (Transaction, Vec<HTLCOutputInCommitment>)), HandleError> {
3151                 let funding_script = self.get_funding_redeemscript();
3152
3153                 let mut feerate_per_kw = self.feerate_per_kw;
3154                 if let Some(feerate) = self.pending_update_fee {
3155                         if self.channel_outbound {
3156                                 feerate_per_kw = feerate;
3157                         }
3158                 }
3159
3160                 let remote_keys = self.build_remote_transaction_keys()?;
3161                 let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true, feerate_per_kw);
3162                 let remote_commitment_txid = remote_commitment_tx.0.txid();
3163                 let remote_sighash = Message::from_slice(&bip143::SighashComponents::new(&remote_commitment_tx.0).sighash_all(&remote_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]).unwrap();
3164                 let our_sig = self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key);
3165
3166                 let mut htlc_sigs = Vec::new();
3167
3168                 for ref htlc in remote_commitment_tx.1.iter() {
3169                         let htlc_tx = self.build_htlc_transaction(&remote_commitment_txid, htlc, false, &remote_keys, feerate_per_kw);
3170                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &remote_keys);
3171                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
3172                         let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &remote_keys.per_commitment_point, &self.local_keys.htlc_base_key), self.channel_id());
3173                         htlc_sigs.push(self.secp_ctx.sign(&htlc_sighash, &our_htlc_key));
3174                 }
3175
3176                 Ok((msgs::CommitmentSigned {
3177                         channel_id: self.channel_id,
3178                         signature: our_sig,
3179                         htlc_signatures: htlc_sigs,
3180                 }, remote_commitment_tx))
3181         }
3182
3183         /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
3184         /// to send to the remote peer in one go.
3185         /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
3186         /// more info.
3187         pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
3188                 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet)? {
3189                         Some(update_add_htlc) => {
3190                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
3191                                 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
3192                         },
3193                         None => Ok(None)
3194                 }
3195         }
3196
3197         /// Begins the shutdown process, getting a message for the remote peer and returning all
3198         /// holding cell HTLCs for payment failure.
3199         pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<(HTLCSource, [u8; 32])>), APIError> {
3200                 for htlc in self.pending_outbound_htlcs.iter() {
3201                         if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
3202                                 return Err(APIError::APIMisuseError{err: "Cannot begin shutdown with pending HTLCs. Process pending events first"});
3203                         }
3204                 }
3205                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
3206                         if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
3207                                 return Err(APIError::APIMisuseError{err: "Shutdown already in progress"});
3208                         }
3209                         else if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
3210                                 return Err(APIError::ChannelUnavailable{err: "Shutdown already in progress by remote"});
3211                         }
3212                 }
3213                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
3214                 if self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) != 0 {
3215                         return Err(APIError::ChannelUnavailable{err: "Cannot begin shutdown while peer is disconnected or we're waiting on a monitor update, maybe force-close instead?"});
3216                 }
3217
3218                 let our_closing_script = self.get_closing_scriptpubkey();
3219
3220                 // From here on out, we may not fail!
3221                 if self.channel_state < ChannelState::FundingSent as u32 {
3222                         self.channel_state = ChannelState::ShutdownComplete as u32;
3223                 } else {
3224                         self.channel_state |= ChannelState::LocalShutdownSent as u32;
3225                 }
3226                 self.channel_update_count += 1;
3227
3228                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
3229                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
3230                 // cell HTLCs and return them to fail the payment.
3231                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3232                 self.holding_cell_htlc_updates.retain(|htlc_update| {
3233                         match htlc_update {
3234                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
3235                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
3236                                         false
3237                                 },
3238                                 _ => true
3239                         }
3240                 });
3241
3242                 Ok((msgs::Shutdown {
3243                         channel_id: self.channel_id,
3244                         scriptpubkey: our_closing_script,
3245                 }, dropped_outbound_htlcs))
3246         }
3247
3248         /// Gets the latest commitment transaction and any dependant transactions for relay (forcing
3249         /// shutdown of this channel - no more calls into this Channel may be made afterwards except
3250         /// those explicitly stated to be allowed after shutdown completes, eg some simple getters).
3251         /// Also returns the list of payment_hashes for channels which we can safely fail backwards
3252         /// immediately (others we will have to allow to time out).
3253         pub fn force_shutdown(&mut self) -> (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>) {
3254                 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
3255
3256                 // We go ahead and "free" any holding cell HTLCs or HTLCs we haven't yet committed to and
3257                 // return them to fail the payment.
3258                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3259                 for htlc_update in self.holding_cell_htlc_updates.drain(..) {
3260                         match htlc_update {
3261                                 HTLCUpdateAwaitingACK::AddHTLC { source, payment_hash, .. } => {
3262                                         dropped_outbound_htlcs.push((source, payment_hash));
3263                                 },
3264                                 _ => {}
3265                         }
3266                 }
3267
3268                 for _htlc in self.pending_outbound_htlcs.drain(..) {
3269                         //TODO: Do something with the remaining HTLCs
3270                         //(we need to have the ChannelManager monitor them so we can claim the inbound HTLCs
3271                         //which correspond)
3272                 }
3273
3274                 self.channel_state = ChannelState::ShutdownComplete as u32;
3275                 self.channel_update_count += 1;
3276                 let mut res = Vec::new();
3277                 mem::swap(&mut res, &mut self.last_local_commitment_txn);
3278                 (res, dropped_outbound_htlcs)
3279         }
3280 }
3281
3282 #[cfg(test)]
3283 mod tests {
3284         use bitcoin::util::hash::Sha256dHash;
3285         use bitcoin::util::bip143;
3286         use bitcoin::network::serialize::serialize;
3287         use bitcoin::blockdata::script::Script;
3288         use bitcoin::blockdata::transaction::Transaction;
3289         use hex;
3290         use ln::channelmanager::HTLCSource;
3291         use ln::channel::{Channel,ChannelKeys,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,TxCreationKeys};
3292         use ln::channel::MAX_FUNDING_SATOSHIS;
3293         use ln::chan_utils;
3294         use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
3295         use chain::transaction::OutPoint;
3296         use util::test_utils;
3297         use util::logger::Logger;
3298         use secp256k1::{Secp256k1,Message,Signature};
3299         use secp256k1::key::{SecretKey,PublicKey};
3300         use crypto::sha2::Sha256;
3301         use crypto::digest::Digest;
3302         use std::sync::Arc;
3303
3304         struct TestFeeEstimator {
3305                 fee_est: u64
3306         }
3307         impl FeeEstimator for TestFeeEstimator {
3308                 fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
3309                         self.fee_est
3310                 }
3311         }
3312
3313         #[test]
3314         fn test_max_funding_satoshis() {
3315                 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
3316                         "MAX_FUNDING_SATOSHIS is greater than all satoshis on existence");
3317         }
3318
3319         #[test]
3320         fn outbound_commitment_test() {
3321                 // Test vectors from BOLT 3 Appendix C:
3322                 let feeest = TestFeeEstimator{fee_est: 15000};
3323                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
3324                 let secp_ctx = Secp256k1::new();
3325
3326                 let chan_keys = ChannelKeys {
3327                         funding_key: SecretKey::from_slice(&secp_ctx, &hex::decode("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
3328                         payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
3329                         delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
3330                         htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
3331
3332                         // These aren't set in the test vectors:
3333                         revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
3334                         channel_close_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
3335                         channel_monitor_claim_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
3336                         commitment_seed: [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff],
3337                 };
3338                 assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).serialize()[..],
3339                                 hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
3340
3341                 let their_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap());
3342                 let mut chan = Channel::new_outbound(&feeest, chan_keys, their_node_id, 10000000, 100000, false, 42, Arc::clone(&logger)).unwrap(); // Nothing uses their network key in this test
3343                 chan.their_to_self_delay = 144;
3344                 chan.our_dust_limit_satoshis = 546;
3345
3346                 let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
3347                 chan.channel_monitor.set_funding_info((funding_info, Script::new()));
3348
3349                 chan.their_payment_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
3350                 assert_eq!(chan.their_payment_basepoint.unwrap().serialize()[..],
3351                                 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
3352
3353                 chan.their_funding_pubkey = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13").unwrap()[..]).unwrap()));
3354                 assert_eq!(chan.their_funding_pubkey.unwrap().serialize()[..],
3355                                 hex::decode("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
3356
3357                 chan.their_htlc_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
3358                 assert_eq!(chan.their_htlc_basepoint.unwrap().serialize()[..],
3359                                 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
3360
3361                 chan.their_revocation_basepoint = Some(PublicKey::from_slice(&secp_ctx, &hex::decode("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap());
3362
3363                 // We can't just use build_local_transaction_keys here as the per_commitment_secret is not
3364                 // derived from a commitment_seed, so instead we copy it here and call
3365                 // build_commitment_transaction.
3366                 let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.delayed_payment_base_key);
3367                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
3368                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
3369                 let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.htlc_base_key);
3370                 let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &chan.their_revocation_basepoint.unwrap(), &chan.their_payment_basepoint.unwrap(), &chan.their_htlc_basepoint.unwrap()).unwrap();
3371
3372                 let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
3373
3374                 macro_rules! test_commitment {
3375                         ( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
3376                                 unsigned_tx = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false, chan.feerate_per_kw);
3377                                 let their_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
3378                                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&unsigned_tx.0).sighash_all(&unsigned_tx.0.input[0], &chan.get_funding_redeemscript(), chan.channel_value_satoshis)[..]).unwrap();
3379                                 secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey.unwrap()).unwrap();
3380
3381                                 chan.sign_commitment_transaction(&mut unsigned_tx.0, &their_signature);
3382
3383                                 assert_eq!(serialize(&unsigned_tx.0).unwrap()[..],
3384                                                 hex::decode($tx_hex).unwrap()[..]);
3385                         };
3386                 }
3387
3388                 macro_rules! test_htlc_output {
3389                         ( $htlc_idx: expr, $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr ) => {
3390                                 let remote_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
3391
3392                                 let ref htlc = unsigned_tx.1[$htlc_idx];
3393                                 let mut htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys, chan.feerate_per_kw);
3394                                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
3395                                 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
3396                                 secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
3397
3398                                 let mut preimage: Option<[u8; 32]> = None;
3399                                 if !htlc.offered {
3400                                         for i in 0..5 {
3401                                                 let mut sha = Sha256::new();
3402                                                 sha.input(&[i; 32]);
3403
3404                                                 let mut out = [0; 32];
3405                                                 sha.result(&mut out);
3406
3407                                                 if out == htlc.payment_hash {
3408                                                         preimage = Some([i; 32]);
3409                                                 }
3410                                         }
3411
3412                                         assert!(preimage.is_some());
3413                                 }
3414
3415                                 chan.sign_htlc_transaction(&mut htlc_tx, &remote_signature, &preimage, &htlc, &keys).unwrap();
3416                                 assert_eq!(serialize(&htlc_tx).unwrap()[..],
3417                                                 hex::decode($tx_hex).unwrap()[..]);
3418                         };
3419                 }
3420
3421                 {
3422                         // simple commitment tx with no HTLCs
3423                         chan.value_to_self_msat = 7000000000;
3424
3425                         test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
3426                                          "3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
3427                                          "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");
3428                 }
3429
3430                 chan.pending_inbound_htlcs.push({
3431                         let mut out = InboundHTLCOutput{
3432                                 htlc_id: 0,
3433                                 amount_msat: 1000000,
3434                                 cltv_expiry: 500,
3435                                 payment_hash: [0; 32],
3436                                 state: InboundHTLCState::Committed,
3437                         };
3438                         let mut sha = Sha256::new();
3439                         sha.input(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
3440                         sha.result(&mut out.payment_hash);
3441                         out
3442                 });
3443                 chan.pending_inbound_htlcs.push({
3444                         let mut out = InboundHTLCOutput{
3445                                 htlc_id: 1,
3446                                 amount_msat: 2000000,
3447                                 cltv_expiry: 501,
3448                                 payment_hash: [0; 32],
3449                                 state: InboundHTLCState::Committed,
3450                         };
3451                         let mut sha = Sha256::new();
3452                         sha.input(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
3453                         sha.result(&mut out.payment_hash);
3454                         out
3455                 });
3456                 chan.pending_outbound_htlcs.push({
3457                         let mut out = OutboundHTLCOutput{
3458                                 htlc_id: 2,
3459                                 amount_msat: 2000000,
3460                                 cltv_expiry: 502,
3461                                 payment_hash: [0; 32],
3462                                 state: OutboundHTLCState::Committed,
3463                                 source: HTLCSource::dummy(),
3464                                 fail_reason: None,
3465                         };
3466                         let mut sha = Sha256::new();
3467                         sha.input(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap());
3468                         sha.result(&mut out.payment_hash);
3469                         out
3470                 });
3471                 chan.pending_outbound_htlcs.push({
3472                         let mut out = OutboundHTLCOutput{
3473                                 htlc_id: 3,
3474                                 amount_msat: 3000000,
3475                                 cltv_expiry: 503,
3476                                 payment_hash: [0; 32],
3477                                 state: OutboundHTLCState::Committed,
3478                                 source: HTLCSource::dummy(),
3479                                 fail_reason: None,
3480                         };
3481                         let mut sha = Sha256::new();
3482                         sha.input(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap());
3483                         sha.result(&mut out.payment_hash);
3484                         out
3485                 });
3486                 chan.pending_inbound_htlcs.push({
3487                         let mut out = InboundHTLCOutput{
3488                                 htlc_id: 4,
3489                                 amount_msat: 4000000,
3490                                 cltv_expiry: 504,
3491                                 payment_hash: [0; 32],
3492                                 state: InboundHTLCState::Committed,
3493                         };
3494                         let mut sha = Sha256::new();
3495                         sha.input(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap());
3496                         sha.result(&mut out.payment_hash);
3497                         out
3498                 });
3499
3500                 {
3501                         // commitment tx with all five HTLCs untrimmed (minimum feerate)
3502                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3503                         chan.feerate_per_kw = 0;
3504
3505                         test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
3506                                          "30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
3507                                          "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");
3508
3509                         assert_eq!(unsigned_tx.1.len(), 5);
3510
3511                         test_htlc_output!(0,
3512                                           "304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
3513                                           "304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
3514                                           "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");
3515
3516                         test_htlc_output!(1,
3517                                           "3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
3518                                           "3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
3519                                           "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");
3520
3521                         test_htlc_output!(2,
3522                                           "304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
3523                                           "3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
3524                                           "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");
3525
3526                         test_htlc_output!(3,
3527                                           "3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
3528                                           "30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
3529                                           "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");
3530
3531                         test_htlc_output!(4,
3532                                           "304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
3533                                           "30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
3534                                           "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");
3535                 }
3536
3537                 {
3538                         // commitment tx with seven outputs untrimmed (maximum feerate)
3539                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3540                         chan.feerate_per_kw = 647;
3541
3542                         test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
3543                                          "304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
3544                                          "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");
3545
3546                         assert_eq!(unsigned_tx.1.len(), 5);
3547
3548                         test_htlc_output!(0,
3549                                           "30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
3550                                           "304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
3551                                           "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");
3552
3553                         test_htlc_output!(1,
3554                                           "304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
3555                                           "304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
3556                                           "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");
3557
3558                         test_htlc_output!(2,
3559                                           "304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
3560                                           "3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
3561                                           "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");
3562
3563                         test_htlc_output!(3,
3564                                           "30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
3565                                           "3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
3566                                           "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");
3567
3568                         test_htlc_output!(4,
3569                                           "3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
3570                                           "304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
3571                                           "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");
3572                 }
3573
3574                 {
3575                         // commitment tx with six outputs untrimmed (minimum feerate)
3576                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3577                         chan.feerate_per_kw = 648;
3578
3579                         test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
3580                                          "3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
3581                                          "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");
3582
3583                         assert_eq!(unsigned_tx.1.len(), 4);
3584
3585                         test_htlc_output!(0,
3586                                           "3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
3587                                           "3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
3588                                           "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");
3589
3590                         test_htlc_output!(1,
3591                                           "3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
3592                                           "304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
3593                                           "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");
3594
3595                         test_htlc_output!(2,
3596                                           "3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
3597                                           "304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
3598                                           "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");
3599
3600                         test_htlc_output!(3,
3601                                           "3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
3602                                           "304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
3603                                           "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");
3604                 }
3605
3606                 {
3607                         // commitment tx with six outputs untrimmed (maximum feerate)
3608                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3609                         chan.feerate_per_kw = 2069;
3610
3611                         test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
3612                                          "304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
3613                                          "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");
3614
3615                         assert_eq!(unsigned_tx.1.len(), 4);
3616
3617                         test_htlc_output!(0,
3618                                           "3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
3619                                           "3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
3620                                           "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");
3621
3622                         test_htlc_output!(1,
3623                                           "3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
3624                                           "3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
3625                                           "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");
3626
3627                         test_htlc_output!(2,
3628                                           "3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
3629                                           "304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
3630                                           "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");
3631
3632                         test_htlc_output!(3,
3633                                           "30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
3634                                           "304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
3635                                           "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");
3636                 }
3637
3638                 {
3639                         // commitment tx with five outputs untrimmed (minimum feerate)
3640                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3641                         chan.feerate_per_kw = 2070;
3642
3643                         test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
3644                                          "30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
3645                                          "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");
3646
3647                         assert_eq!(unsigned_tx.1.len(), 3);
3648
3649                         test_htlc_output!(0,
3650                                           "3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
3651                                           "3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
3652                                           "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");
3653
3654                         test_htlc_output!(1,
3655                                           "3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
3656                                           "3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
3657                                           "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");
3658
3659                         test_htlc_output!(2,
3660                                           "3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
3661                                           "304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
3662                                           "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");
3663                 }
3664
3665                 {
3666                         // commitment tx with five outputs untrimmed (maximum feerate)
3667                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3668                         chan.feerate_per_kw = 2194;
3669
3670                         test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
3671                                          "304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
3672                                          "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");
3673
3674                         assert_eq!(unsigned_tx.1.len(), 3);
3675
3676                         test_htlc_output!(0,
3677                                           "30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
3678                                           "3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
3679                                           "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");
3680
3681                         test_htlc_output!(1,
3682                                           "30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
3683                                           "304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
3684                                           "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");
3685
3686                         test_htlc_output!(2,
3687                                           "3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
3688                                           "3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
3689                                           "02000000000101fb824d4e4dafc0f567789dee3a6bce8d411fe80f5563d8cdfdcc7d7e4447d43a020000000000000000019a090000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a01483045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
3690                 }
3691
3692                 {
3693                         // commitment tx with four outputs untrimmed (minimum feerate)
3694                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3695                         chan.feerate_per_kw = 2195;
3696
3697                         test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
3698                                          "304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
3699                                          "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");
3700
3701                         assert_eq!(unsigned_tx.1.len(), 2);
3702
3703                         test_htlc_output!(0,
3704                                           "3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
3705                                           "3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
3706                                           "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");
3707
3708                         test_htlc_output!(1,
3709                                           "3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
3710                                           "30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
3711                                           "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");
3712                 }
3713
3714                 {
3715                         // commitment tx with four outputs untrimmed (maximum feerate)
3716                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3717                         chan.feerate_per_kw = 3702;
3718
3719                         test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
3720                                          "304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
3721                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8004b80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de8431106f916a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e040047304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b001483045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c101475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
3722
3723                         assert_eq!(unsigned_tx.1.len(), 2);
3724
3725                         test_htlc_output!(0,
3726                                           "3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
3727                                           "304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
3728                                           "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");
3729
3730                         test_htlc_output!(1,
3731                                           "3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
3732                                           "30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
3733                                           "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");
3734                 }
3735
3736                 {
3737                         // commitment tx with three outputs untrimmed (minimum feerate)
3738                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3739                         chan.feerate_per_kw = 3703;
3740
3741                         test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
3742                                          "3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
3743                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8003a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de843110eb936a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0400473044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506014830450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb001475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
3744
3745                         assert_eq!(unsigned_tx.1.len(), 1);
3746
3747                         test_htlc_output!(0,
3748                                           "3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
3749                                           "3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
3750                                           "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");
3751                 }
3752
3753                 {
3754                         // commitment tx with three outputs untrimmed (maximum feerate)
3755                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3756                         chan.feerate_per_kw = 4914;
3757
3758                         test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
3759                                          "304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
3760                                          "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");
3761
3762                         assert_eq!(unsigned_tx.1.len(), 1);
3763
3764                         test_htlc_output!(0,
3765                                           "3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
3766                                           "304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
3767                                           "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");
3768                 }
3769
3770                 {
3771                         // commitment tx with two outputs untrimmed (minimum feerate)
3772                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3773                         chan.feerate_per_kw = 4915;
3774
3775                         test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
3776                                          "3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
3777                                          "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");
3778
3779                         assert_eq!(unsigned_tx.1.len(), 0);
3780                 }
3781
3782                 {
3783                         // commitment tx with two outputs untrimmed (maximum feerate)
3784                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3785                         chan.feerate_per_kw = 9651180;
3786
3787                         test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
3788                                          "30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
3789                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b800222020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80ec0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de84311004004730440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b901473044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd01475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
3790
3791                         assert_eq!(unsigned_tx.1.len(), 0);
3792                 }
3793
3794                 {
3795                         // commitment tx with one output untrimmed (minimum feerate)
3796                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3797                         chan.feerate_per_kw = 9651181;
3798
3799                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
3800                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
3801                                          "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");
3802
3803                         assert_eq!(unsigned_tx.1.len(), 0);
3804                 }
3805
3806                 {
3807                         // commitment tx with fee greater than funder amount
3808                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3809                         chan.feerate_per_kw = 9651936;
3810
3811                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
3812                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
3813                                          "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");
3814
3815                         assert_eq!(unsigned_tx.1.len(), 0);
3816                 }
3817         }
3818
3819         #[test]
3820         fn test_per_commitment_secret_gen() {
3821                 // Test vectors from BOLT 3 Appendix D:
3822
3823                 let mut seed = [0; 32];
3824                 seed[0..32].clone_from_slice(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
3825                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
3826                            hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
3827
3828                 seed[0..32].clone_from_slice(&hex::decode("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
3829                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
3830                            hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
3831
3832                 assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
3833                            hex::decode("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
3834
3835                 assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
3836                            hex::decode("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
3837
3838                 seed[0..32].clone_from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
3839                 assert_eq!(chan_utils::build_commitment_secret(seed, 1),
3840                            hex::decode("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
3841         }
3842
3843         #[test]
3844         fn test_key_derivation() {
3845                 // Test vectors from BOLT 3 Appendix E:
3846                 let secp_ctx = Secp256k1::new();
3847
3848                 let base_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
3849                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
3850
3851                 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret);
3852                 assert_eq!(base_point.serialize()[..], hex::decode("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
3853
3854                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
3855                 assert_eq!(per_commitment_point.serialize()[..], hex::decode("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
3856
3857                 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
3858                                 hex::decode("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
3859
3860                 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
3861                                 SecretKey::from_slice(&secp_ctx, &hex::decode("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
3862
3863                 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
3864                                 hex::decode("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
3865
3866                 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
3867                                 SecretKey::from_slice(&secp_ctx, &hex::decode("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());
3868         }
3869 }