_ 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::uint::Uint256;
   6 use bitcoin::util::hash::{Sha256dHash, Hash160};
   7 use bitcoin::util::bip143;
   8 use bitcoin::network::serialize::BitcoinHash;
   9
  10 use secp256k1::key::{PublicKey,SecretKey};
  11 use secp256k1::{Secp256k1,Message,Signature};
  12 use secp256k1;
  13
  14 use crypto::digest::Digest;
  15 use crypto::hkdf::{hkdf_extract,hkdf_expand};
  16
  17 use ln::msgs;
  18 use ln::msgs::{HandleError, MsgEncodable};
  19 use ln::channelmonitor::ChannelMonitor;
  20 use ln::channelmanager::{PendingForwardHTLCInfo, HTLCFailReason};
  21 use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment,HTLC_SUCCESS_TX_WEIGHT,HTLC_TIMEOUT_TX_WEIGHT};
  22 use ln::chan_utils;
  23 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
  24 use chain::transaction::OutPoint;
  25 use util::{transaction_utils,rng};
  26 use util::sha2::Sha256;
  27
  28 use std::default::Default;
  29 use std::{cmp,mem};
  30 use std::time::Instant;
  31
  32 pub struct ChannelKeys {
  33         pub funding_key: SecretKey,
  34         pub revocation_base_key: SecretKey,
  35         pub payment_base_key: SecretKey,
  36         pub delayed_payment_base_key: SecretKey,
  37         pub htlc_base_key: SecretKey,
  38         pub channel_close_key: SecretKey,
  39         pub channel_monitor_claim_key: SecretKey,
  40         pub commitment_seed: [u8; 32],
  41 }
  42
  43 impl ChannelKeys {
  44         pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
  45                 let mut prk = [0; 32];
  46                 hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
  47                 let secp_ctx = Secp256k1::without_caps();
  48
  49                 let mut okm = [0; 32];
  50                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
  51                 let funding_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  52
  53                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning revocation base key info", &mut okm);
  54                 let revocation_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  55
  56                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning payment base key info", &mut okm);
  57                 let payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  58
  59                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning delayed payment base key info", &mut okm);
  60                 let delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  61
  62                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
  63                 let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  64
  65                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
  66                 let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  67
  68                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
  69                 let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm)?;
  70
  71                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
  72
  73                 Ok(ChannelKeys {
  74                         funding_key: funding_key,
  75                         revocation_base_key: revocation_base_key,
  76                         payment_base_key: payment_base_key,
  77                         delayed_payment_base_key: delayed_payment_base_key,
  78                         htlc_base_key: htlc_base_key,
  79                         channel_close_key: channel_close_key,
  80                         channel_monitor_claim_key: channel_monitor_claim_key,
  81                         commitment_seed: okm
  82                 })
  83         }
  84 }
  85
  86 #[derive(PartialEq)]
  87 enum HTLCState {
  88         /// Added by remote, to be included in next local commitment tx.
  89         RemoteAnnounced,
  90         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
  91         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
  92         /// accept this HTLC. Implies AwaitingRemoteRevoke.
  93         /// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
  94         /// a remote revoke_and_ack on a previous state before we can do so.
  95         AwaitingRemoteRevokeToAnnounce,
  96         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
  97         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
  98         /// accept this HTLC. Implies AwaitingRemoteRevoke.
  99         /// We have included this HTLC in our latest commitment_signed and are now just waiting on a
 100         /// revoke_and_ack.
 101         AwaitingAnnouncedRemoteRevoke,
 102         /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
 103         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
 104         /// we will promote to Committed (note that they may not accept it until the next time we
 105         /// revoke, but we dont really care about that:
 106         ///  * they've revoked, so worst case we can announce an old state and get our (option on)
 107         ///    money back (though we wont), and,
 108         ///  * we'll send them a revoke when they send a commitment_signed, and since only they're
 109         ///    allowed to remove it, the "can only be removed once committed on both sides" requirement
 110         ///    doesn't matter to us and its up to them to enforce it, worst-case they jump ahead but
 111         ///    we'll never get out of sync).
 112         LocalAnnounced,
 113         Committed,
 114         /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
 115         /// the change (though they'll need to revoke before we fail the payment).
 116         RemoteRemoved,
 117         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
 118         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 119         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
 120         /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
 121         /// remote revoke_and_ack on a previous state before we can do so.
 122         AwaitingRemoteRevokeToRemove,
 123         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
 124         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 125         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
 126         /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
 127         /// revoke_and_ack to drop completely.
 128         AwaitingRemovedRemoteRevoke,
 129         /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
 130         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
 131         /// we'll promote to LocalRemovedAwaitingCommitment if we fulfilled, otherwise we'll drop at
 132         /// that point.
 133         /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
 134         /// commitment transaction without it as otherwise we'll have to force-close the channel to
 135         /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
 136         /// anyway).
 137         LocalRemoved,
 138         /// Removed by us, sent a new commitment_signed and got a revoke_and_ack. Just waiting on an
 139         /// updated local commitment transaction.
 140         LocalRemovedAwaitingCommitment,
 141 }
 142
 143 struct HTLCOutput { //TODO: Refactor into Outbound/InboundHTLCOutput (will save memory and fewer panics)
 144         outbound: bool, // ie to an HTLC-Timeout transaction
 145         htlc_id: u64,
 146         amount_msat: u64,
 147         cltv_expiry: u32,
 148         payment_hash: [u8; 32],
 149         state: HTLCState,
 150         /// If we're in a Remote* removed state, set if they failed, otherwise None
 151         fail_reason: Option<HTLCFailReason>,
 152         /// If we're in LocalRemoved*, set to true if we fulfilled the HTLC, and can claim money
 153         local_removed_fulfilled: bool,
 154         /// state pre-committed Remote* implies pending_forward_state, otherwise it must be None
 155         pending_forward_state: Option<PendingForwardHTLCInfo>,
 156 }
 157
 158 impl HTLCOutput {
 159         fn get_in_commitment(&self, offered: bool) -> HTLCOutputInCommitment {
 160                 HTLCOutputInCommitment {
 161                         offered: offered,
 162                         amount_msat: self.amount_msat,
 163                         cltv_expiry: self.cltv_expiry,
 164                         payment_hash: self.payment_hash,
 165                         transaction_output_index: 0
 166                 }
 167         }
 168 }
 169
 170 /// See AwaitingRemoteRevoke ChannelState for more info
 171 enum HTLCUpdateAwaitingACK {
 172         AddHTLC {
 173                 // always outbound
 174                 amount_msat: u64,
 175                 cltv_expiry: u32,
 176                 payment_hash: [u8; 32],
 177                 onion_routing_packet: msgs::OnionPacket,
 178                 time_created: Instant, //TODO: Some kind of timeout thing-a-majig
 179         },
 180         ClaimHTLC {
 181                 payment_preimage: [u8; 32],
 182                 payment_hash: [u8; 32], // Only here for effecient duplicate detection
 183         },
 184         FailHTLC {
 185                 payment_hash: [u8; 32],
 186                 err_packet: msgs::OnionErrorPacket,
 187         },
 188 }
 189
 190 enum ChannelState {
 191         /// Implies we have (or are prepared to) send our open_channel/accept_channel message
 192         OurInitSent = (1 << 0),
 193         /// Implies we have received their open_channel/accept_channel message
 194         TheirInitSent = (1 << 1),
 195         /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
 196         /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
 197         /// upon receipt of funding_created, so simply skip this state.
 198         FundingCreated = 4,
 199         /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
 200         /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
 201         /// and our counterparty consider the funding transaction confirmed.
 202         FundingSent = 8,
 203         /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
 204         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
 205         TheirFundingLocked = (1 << 4),
 206         /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
 207         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
 208         OurFundingLocked = (1 << 5),
 209         ChannelFunded = 64,
 210         /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
 211         /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
 212         /// messages as then we will be unable to determine which HTLCs they included in their
 213         /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
 214         /// later.
 215         /// Flag is set on ChannelFunded.
 216         AwaitingRemoteRevoke = (1 << 7),
 217         /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
 218         /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
 219         /// to respond with our own shutdown message when possible.
 220         RemoteShutdownSent = (1 << 8),
 221         /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
 222         /// point, we may not add any new HTLCs to the channel.
 223         /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
 224         /// us their shutdown.
 225         LocalShutdownSent = (1 << 9),
 226         /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
 227         /// to drop us, but we store this anyway.
 228         ShutdownComplete = (1 << 10),
 229 }
 230 const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
 231
 232 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
 233 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
 234 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
 235 // inbound channel.
 236 pub struct Channel {
 237         user_id: u64,
 238
 239         channel_id: Uint256,
 240         channel_state: u32,
 241         channel_outbound: bool,
 242         secp_ctx: Secp256k1,
 243         announce_publicly: bool,
 244         channel_value_satoshis: u64,
 245
 246         local_keys: ChannelKeys,
 247
 248         cur_local_commitment_transaction_number: u64,
 249         cur_remote_commitment_transaction_number: u64,
 250         value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
 251         pending_htlcs: Vec<HTLCOutput>,
 252         holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
 253         next_local_htlc_id: u64,
 254         next_remote_htlc_id: u64,
 255         channel_update_count: u32,
 256         feerate_per_kw: u64,
 257
 258         #[cfg(test)]
 259         // Used in ChannelManager's tests to send a revoked transaction
 260         pub last_local_commitment_txn: Vec<Transaction>,
 261         #[cfg(not(test))]
 262         last_local_commitment_txn: Vec<Transaction>,
 263
 264         last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
 265
 266         /// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
 267         /// to detect unconfirmation after a serialize-unserialize roudtrip where we may not see a full
 268         /// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
 269         /// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
 270         funding_tx_confirmed_in: Sha256dHash,
 271         short_channel_id: Option<u64>,
 272         /// Used to deduplicate block_connected callbacks
 273         last_block_connected: Sha256dHash,
 274         funding_tx_confirmations: u64,
 275
 276         their_dust_limit_satoshis: u64,
 277         our_dust_limit_satoshis: u64,
 278         their_max_htlc_value_in_flight_msat: u64,
 279         //get_our_max_htlc_value_in_flight_msat(): u64,
 280         their_channel_reserve_satoshis: u64,
 281         //get_our_channel_reserve_satoshis(): u64,
 282         their_htlc_minimum_msat: u64,
 283         our_htlc_minimum_msat: u64,
 284         their_to_self_delay: u16,
 285         //implied by BREAKDOWN_TIMEOUT: our_to_self_delay: u16,
 286         their_max_accepted_htlcs: u16,
 287         //implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
 288
 289         their_funding_pubkey: PublicKey,
 290         their_revocation_basepoint: PublicKey,
 291         their_payment_basepoint: PublicKey,
 292         their_delayed_payment_basepoint: PublicKey,
 293         their_htlc_basepoint: PublicKey,
 294         their_cur_commitment_point: PublicKey,
 295
 296         their_prev_commitment_point: Option<PublicKey>,
 297         their_node_id: PublicKey,
 298
 299         their_shutdown_scriptpubkey: Option<Script>,
 300
 301         channel_monitor: ChannelMonitor,
 302 }
 303
 304 const OUR_MAX_HTLCS: u16 = 5; //TODO
 305 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
 306 /// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
 307 /// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
 308 /// really allow for this, so instead we're stuck closing it out at that point.
 309 const UNCONF_THRESHOLD: u32 = 6;
 310 /// The amount of time we require our counterparty wait to claim their money (ie time between when
 311 /// we, or our watchtower, must check for them having broadcast a theft transaction).
 312 const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
 313 /// The amount of time we're willing to wait to claim money back to us
 314 const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
 315 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
 316 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
 317 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
 318 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?)
 319 /// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
 320 /// it's 2^24.
 321 pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
 322
 323 macro_rules! secp_call {
 324         ( $res: expr, $err: expr ) => {
 325                 match $res {
 326                         Ok(key) => key,
 327                         //TODO: make the error a parameter
 328                         Err(_) => return Err(HandleError{err: $err, msg: Some(msgs::ErrorAction::DisconnectPeer{})})
 329                 }
 330         };
 331 }
 332
 333 macro_rules! secp_derived_key {
 334         ( $res: expr ) => {
 335                 secp_call!($res, "Derived invalid key, peer is maliciously selecting parameters")
 336         }
 337 }
 338 impl Channel {
 339         // Convert constants + channel value to limits:
 340         fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
 341                 channel_value_satoshis * 1000 / 10 //TODO
 342         }
 343
 344         /// Guaranteed to return a value no larger than channel_value_satoshis
 345         fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
 346                 cmp::min(channel_value_satoshis, 10) //TODO
 347         }
 348
 349         fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
 350                 at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT //TODO
 351         }
 352
 353         fn derive_our_htlc_minimum_msat(_at_open_channel_feerate_per_kw: u64) -> u64 {
 354                 1000 // TODO
 355         }
 356
 357         // Constructors:
 358
 359         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`
 360         pub fn new_outbound(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, channel_value_satoshis: u64, announce_publicly: bool, user_id: u64) -> Channel {
 361                 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
 362                         panic!("funding value > 2^24");
 363                 }
 364
 365                 let feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal);
 366                 let background_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
 367
 368                 let secp_ctx = Secp256k1::new();
 369                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).unwrap().serialize());
 370                 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();
 371                 let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
 372                                                           &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
 373                                                           &chan_keys.htlc_base_key,
 374                                                           BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
 375
 376                 Channel {
 377                         user_id: user_id,
 378
 379                         channel_id: rng::rand_uint256(),
 380                         channel_state: ChannelState::OurInitSent as u32,
 381                         channel_outbound: true,
 382                         secp_ctx: secp_ctx,
 383                         announce_publicly: announce_publicly,
 384                         channel_value_satoshis: channel_value_satoshis,
 385
 386                         local_keys: chan_keys,
 387                         cur_local_commitment_transaction_number: (1 << 48) - 1,
 388                         cur_remote_commitment_transaction_number: (1 << 48) - 1,
 389                         value_to_self_msat: channel_value_satoshis * 1000, //TODO: give them something on open? Parameterize it?
 390                         pending_htlcs: Vec::new(),
 391                         holding_cell_htlc_updates: Vec::new(),
 392                         next_local_htlc_id: 0,
 393                         next_remote_htlc_id: 0,
 394                         channel_update_count: 1,
 395
 396                         last_local_commitment_txn: Vec::new(),
 397
 398                         last_sent_closing_fee: None,
 399
 400                         funding_tx_confirmed_in: Default::default(),
 401                         short_channel_id: None,
 402                         last_block_connected: Default::default(),
 403                         funding_tx_confirmations: 0,
 404
 405                         feerate_per_kw: feerate * 250,
 406                         their_dust_limit_satoshis: 0,
 407                         our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
 408                         their_max_htlc_value_in_flight_msat: 0,
 409                         their_channel_reserve_satoshis: 0,
 410                         their_htlc_minimum_msat: 0,
 411                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(feerate * 250),
 412                         their_to_self_delay: 0,
 413                         their_max_accepted_htlcs: 0,
 414
 415                         their_funding_pubkey: PublicKey::new(),
 416                         their_revocation_basepoint: PublicKey::new(),
 417                         their_payment_basepoint: PublicKey::new(),
 418                         their_delayed_payment_basepoint: PublicKey::new(),
 419                         their_htlc_basepoint: PublicKey::new(),
 420                         their_cur_commitment_point: PublicKey::new(),
 421
 422                         their_prev_commitment_point: None,
 423                         their_node_id: their_node_id,
 424
 425                         their_shutdown_scriptpubkey: None,
 426
 427                         channel_monitor: channel_monitor,
 428                 }
 429         }
 430
 431         fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), HandleError> {
 432                 if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background) * 250 {
 433                         return Err(HandleError{err: "Peer's feerate much too low", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 434                 }
 435                 if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::HighPriority) * 375 { // 375 = 250 * 1.5x
 436                         return Err(HandleError{err: "Peer's feerate much too high", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 437                 }
 438                 Ok(())
 439         }
 440
 441         /// Creates a new channel from a remote sides' request for one.
 442         /// Assumes chain_hash has already been checked and corresponds with what we expect!
 443         /// Generally prefers to take the DisconnectPeer action on failure, as a notice to the sender
 444         /// that we're rejecting the new channel.
 445         pub fn new_from_req(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, announce_publicly: bool) -> Result<Channel, HandleError> {
 446                 // Check sanity of message fields:
 447                 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
 448                         return Err(HandleError{err: "funding value > 2^24", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 449                 }
 450                 if msg.channel_reserve_satoshis > msg.funding_satoshis {
 451                         return Err(HandleError{err: "Bogus channel_reserve_satoshis", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 452                 }
 453                 if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 454                         return Err(HandleError{err: "push_msat more than highest possible value", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 455                 }
 456                 if msg.dust_limit_satoshis > msg.funding_satoshis {
 457                         return Err(HandleError{err: "Peer never wants payout outputs?", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 458                 }
 459                 if msg.max_htlc_value_in_flight_msat > msg.funding_satoshis * 1000 {
 460                         return Err(HandleError{err: "Bogus max_htlc_value_in_flight_satoshis", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 461                 }
 462                 if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 463                         return Err(HandleError{err: "Minimum htlc value is full channel value", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 464                 }
 465                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
 466                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
 467                         return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 468                 }
 469                 if msg.max_accepted_htlcs < 1 {
 470                         return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 471                 }
 472                 if (msg.channel_flags & 254) != 0 {
 473                         return Err(HandleError{err: "unknown channel_flags", msg: Some(msgs::ErrorAction::DisconnectPeer{})});
 474                 }
 475
 476                 // Convert things into internal flags and prep our state:
 477
 478                 let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
 479
 480                 let background_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
 481
 482                 let secp_ctx = Secp256k1::new();
 483                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).unwrap().serialize());
 484                 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();
 485                 let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
 486                                                               &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key).unwrap(),
 487                                                               &chan_keys.htlc_base_key,
 488                                                               BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
 489                 channel_monitor.set_their_htlc_base_key(&msg.htlc_basepoint);
 490                 channel_monitor.set_their_to_self_delay(msg.to_self_delay);
 491
 492                 let mut chan = Channel {
 493                         user_id: user_id,
 494
 495                         channel_id: msg.temporary_channel_id,
 496                         channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
 497                         channel_outbound: false,
 498                         secp_ctx: secp_ctx,
 499                         announce_publicly: their_announce && announce_publicly,
 500
 501                         local_keys: chan_keys,
 502                         cur_local_commitment_transaction_number: (1 << 48) - 1,
 503                         cur_remote_commitment_transaction_number: (1 << 48) - 1,
 504                         value_to_self_msat: msg.push_msat,
 505                         pending_htlcs: Vec::new(),
 506                         holding_cell_htlc_updates: Vec::new(),
 507                         next_local_htlc_id: 0,
 508                         next_remote_htlc_id: 0,
 509                         channel_update_count: 1,
 510
 511                         last_local_commitment_txn: Vec::new(),
 512
 513                         last_sent_closing_fee: None,
 514
 515                         funding_tx_confirmed_in: Default::default(),
 516                         short_channel_id: None,
 517                         last_block_connected: Default::default(),
 518                         funding_tx_confirmations: 0,
 519
 520                         feerate_per_kw: msg.feerate_per_kw as u64,
 521                         channel_value_satoshis: msg.funding_satoshis,
 522                         their_dust_limit_satoshis: msg.dust_limit_satoshis,
 523                         our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
 524                         their_max_htlc_value_in_flight_msat: msg.max_htlc_value_in_flight_msat,
 525                         their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
 526                         their_htlc_minimum_msat: msg.htlc_minimum_msat,
 527                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
 528                         their_to_self_delay: msg.to_self_delay,
 529                         their_max_accepted_htlcs: msg.max_accepted_htlcs,
 530
 531                         their_funding_pubkey: msg.funding_pubkey,
 532                         their_revocation_basepoint: msg.revocation_basepoint,
 533                         their_payment_basepoint: msg.payment_basepoint,
 534                         their_delayed_payment_basepoint: msg.delayed_payment_basepoint,
 535                         their_htlc_basepoint: msg.htlc_basepoint,
 536                         their_cur_commitment_point: msg.first_per_commitment_point,
 537
 538                         their_prev_commitment_point: None,
 539                         their_node_id: their_node_id,
 540
 541                         their_shutdown_scriptpubkey: None,
 542
 543                         channel_monitor: channel_monitor,
 544                 };
 545
 546                 let obscure_factor = chan.get_commitment_transaction_number_obscure_factor();
 547                 chan.channel_monitor.set_commitment_obscure_factor(obscure_factor);
 548
 549                 Ok(chan)
 550         }
 551
 552         // Utilities to derive keys:
 553
 554         fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
 555                 let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, idx);
 556                 SecretKey::from_slice(&self.secp_ctx, &res).unwrap()
 557         }
 558
 559         // Utilities to build transactions:
 560
 561         fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
 562                 let mut sha = Sha256::new();
 563                 let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap();
 564
 565                 if self.channel_outbound {
 566                         sha.input(&our_payment_basepoint.serialize());
 567                         sha.input(&self.their_payment_basepoint.serialize());
 568                 } else {
 569                         sha.input(&self.their_payment_basepoint.serialize());
 570                         sha.input(&our_payment_basepoint.serialize());
 571                 }
 572                 let mut res = [0; 32];
 573                 sha.result(&mut res);
 574
 575                 ((res[26] as u64) << 5*8) |
 576                 ((res[27] as u64) << 4*8) |
 577                 ((res[28] as u64) << 3*8) |
 578                 ((res[29] as u64) << 2*8) |
 579                 ((res[30] as u64) << 1*8) |
 580                 ((res[31] as u64) << 0*8)
 581         }
 582
 583         /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
 584         /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
 585         /// the transaction. Thus, b will generally be sending a signature over such a transaction to
 586         /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
 587         /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
 588         /// an HTLC to a).
 589         /// @local is used only to convert relevant internal structures which refer to remote vs local
 590         /// to decide value of outputs and direction of HTLCs.
 591         /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
 592         /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
 593         /// have not yet committed it. Such HTLCs will only be included in transactions which are being
 594         /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
 595         /// which peer generated this transaction and "to whom" this transaction flows.
 596         #[inline]
 597         fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool) -> (Transaction, Vec<HTLCOutputInCommitment>) {
 598                 let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ commitment_number;
 599
 600                 let txins = {
 601                         let mut ins: Vec<TxIn> = Vec::new();
 602                         ins.push(TxIn {
 603                                 prev_hash: self.channel_monitor.get_funding_txo().unwrap().txid,
 604                                 prev_index: self.channel_monitor.get_funding_txo().unwrap().index as u32,
 605                                 script_sig: Script::new(),
 606                                 sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
 607                                 witness: Vec::new(),
 608                         });
 609                         ins
 610                 };
 611
 612                 let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::with_capacity(self.pending_htlcs.len() + 2);
 613
 614                 let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
 615                 let mut remote_htlc_total_msat = 0;
 616                 let mut local_htlc_total_msat = 0;
 617                 let mut value_to_self_msat_offset = 0;
 618
 619                 for ref htlc in self.pending_htlcs.iter() {
 620                         let include = match htlc.state {
 621                                 HTLCState::RemoteAnnounced => !generated_by_local,
 622                                 HTLCState::AwaitingRemoteRevokeToAnnounce => !generated_by_local,
 623                                 HTLCState::AwaitingAnnouncedRemoteRevoke => true,
 624                                 HTLCState::LocalAnnounced => generated_by_local,
 625                                 HTLCState::Committed => true,
 626                                 HTLCState::RemoteRemoved => generated_by_local,
 627                                 HTLCState::AwaitingRemoteRevokeToRemove => generated_by_local,
 628                                 HTLCState::AwaitingRemovedRemoteRevoke => false,
 629                                 HTLCState::LocalRemoved => !generated_by_local,
 630                                 HTLCState::LocalRemovedAwaitingCommitment => false,
 631                         };
 632
 633                         if include {
 634                                 if htlc.outbound == local { // "offered HTLC output"
 635                                         if htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
 636                                                 let htlc_in_tx = htlc.get_in_commitment(true);
 637                                                 txouts.push((TxOut {
 638                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
 639                                                         value: htlc.amount_msat / 1000
 640                                                 }, Some(htlc_in_tx)));
 641                                         }
 642                                 } else {
 643                                         if htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
 644                                                 let htlc_in_tx = htlc.get_in_commitment(false);
 645                                                 txouts.push((TxOut { // "received HTLC output"
 646                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
 647                                                         value: htlc.amount_msat / 1000
 648                                                 }, Some(htlc_in_tx)));
 649                                         }
 650                                 };
 651                                 if htlc.outbound {
 652                                         local_htlc_total_msat += htlc.amount_msat;
 653                                 } else {
 654                                         remote_htlc_total_msat += htlc.amount_msat;
 655                                 }
 656                         } else {
 657                                 match htlc.state {
 658                                         HTLCState::AwaitingRemoteRevokeToRemove|HTLCState::AwaitingRemovedRemoteRevoke => {
 659                                                 if generated_by_local && htlc.fail_reason.is_none() {
 660                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
 661                                                 }
 662                                         },
 663                                         HTLCState::LocalRemoved => {
 664                                                 if !generated_by_local && htlc.local_removed_fulfilled {
 665                                                         value_to_self_msat_offset += htlc.amount_msat as i64;
 666                                                 }
 667                                         },
 668                                         HTLCState::LocalRemovedAwaitingCommitment => {
 669                                                 value_to_self_msat_offset += htlc.amount_msat as i64;
 670                                         },
 671                                         _ => {},
 672                                 }
 673                         }
 674                 }
 675
 676                 let total_fee: u64 = self.feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
 677                 let value_to_self: i64 = ((self.value_to_self_msat - local_htlc_total_msat) as i64 + value_to_self_msat_offset) / 1000 - if self.channel_outbound { total_fee as i64 } else { 0 };
 678                 let value_to_remote: i64 = (((self.channel_value_satoshis * 1000 - self.value_to_self_msat - remote_htlc_total_msat) as i64 - value_to_self_msat_offset) / 1000) - if self.channel_outbound { 0 } else { total_fee as i64 };
 679
 680                 let value_to_a = if local { value_to_self } else { value_to_remote };
 681                 let value_to_b = if local { value_to_remote } else { value_to_self };
 682
 683                 if value_to_a >= (dust_limit_satoshis as i64) {
 684                         txouts.push((TxOut {
 685                                 script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
 686                                                                                        if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
 687                                                                                        &keys.a_delayed_payment_key).to_v0_p2wsh(),
 688                                 value: value_to_a as u64
 689                         }, None));
 690                 }
 691
 692                 if value_to_b >= (dust_limit_satoshis as i64) {
 693                         txouts.push((TxOut {
 694                                 script_pubkey: Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
 695                                                              .push_slice(&Hash160::from_data(&keys.b_payment_key.serialize())[..])
 696                                                              .into_script(),
 697                                 value: value_to_b as u64
 698                         }, None));
 699                 }
 700
 701                 transaction_utils::sort_outputs(&mut txouts);
 702
 703                 let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
 704                 let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::with_capacity(txouts.len());
 705                 for (idx, out) in txouts.drain(..).enumerate() {
 706                         outputs.push(out.0);
 707                         if let Some(out_htlc) = out.1 {
 708                                 htlcs_used.push(out_htlc);
 709                                 htlcs_used.last_mut().unwrap().transaction_output_index = idx as u32;
 710                         }
 711                 }
 712
 713                 (Transaction {
 714                         version: 2,
 715                         lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
 716                         input: txins,
 717                         output: outputs,
 718                 }, htlcs_used)
 719         }
 720
 721         #[inline]
 722         fn get_closing_scriptpubkey(&self) -> Script {
 723                 let our_channel_close_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.channel_close_key).unwrap().serialize());
 724                 Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
 725         }
 726
 727         #[inline]
 728         fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
 729                 (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)
 730         }
 731
 732         #[inline]
 733         fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
 734                 let txins = {
 735                         let mut ins: Vec<TxIn> = Vec::new();
 736                         ins.push(TxIn {
 737                                 prev_hash: self.channel_monitor.get_funding_txo().unwrap().txid,
 738                                 prev_index: self.channel_monitor.get_funding_txo().unwrap().index as u32,
 739                                 script_sig: Script::new(),
 740                                 sequence: 0xffffffff,
 741                                 witness: Vec::new(),
 742                         });
 743                         ins
 744                 };
 745
 746                 assert!(self.pending_htlcs.is_empty());
 747                 let mut txouts: Vec<(TxOut, ())> = Vec::new();
 748
 749                 let mut total_fee_satoshis = proposed_total_fee_satoshis;
 750                 let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
 751                 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 };
 752
 753                 if value_to_self < 0 {
 754                         assert!(self.channel_outbound);
 755                         total_fee_satoshis += (-value_to_self) as u64;
 756                 } else if value_to_remote < 0 {
 757                         assert!(!self.channel_outbound);
 758                         total_fee_satoshis += (-value_to_remote) as u64;
 759                 }
 760
 761                 if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
 762                         txouts.push((TxOut {
 763                                 script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
 764                                 value: value_to_remote as u64
 765                         }, ()));
 766                 }
 767
 768                 if value_to_self as u64 > self.our_dust_limit_satoshis {
 769                         txouts.push((TxOut {
 770                                 script_pubkey: self.get_closing_scriptpubkey(),
 771                                 value: value_to_self as u64
 772                         }, ()));
 773                 }
 774
 775                 transaction_utils::sort_outputs(&mut txouts);
 776
 777                 let mut outputs: Vec<TxOut> = Vec::new();
 778                 for out in txouts.drain(..) {
 779                         outputs.push(out.0);
 780                 }
 781
 782                 (Transaction {
 783                         version: 2,
 784                         lock_time: 0,
 785                         input: txins,
 786                         output: outputs,
 787                 }, total_fee_satoshis)
 788         }
 789
 790         #[inline]
 791         /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
 792         /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
 793         /// our counterparty!)
 794         /// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
 795         /// TODO Some magic rust shit to compile-time check this?
 796         fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, HandleError> {
 797                 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number)).unwrap();
 798                 let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key).unwrap();
 799                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap();
 800
 801                 Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &self.their_revocation_basepoint, &self.their_payment_basepoint, &self.their_htlc_basepoint)))
 802         }
 803
 804         #[inline]
 805         /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
 806         /// will sign and send to our counterparty.
 807         fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, HandleError> {
 808                 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
 809                 //may see payments to it!
 810                 let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap();
 811                 let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key).unwrap();
 812                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap();
 813
 814                 Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point, &self.their_delayed_payment_basepoint, &self.their_htlc_basepoint, &revocation_basepoint, &payment_basepoint, &htlc_basepoint)))
 815         }
 816
 817         /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
 818         /// pays to get_funding_redeemscript().to_v0_p2wsh()).
 819         pub fn get_funding_redeemscript(&self) -> Script {
 820                 let builder = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2);
 821                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap().serialize();
 822                 let their_funding_key = self.their_funding_pubkey.serialize();
 823                 if our_funding_key[..] < their_funding_key[..] {
 824                         builder.push_slice(&our_funding_key)
 825                                 .push_slice(&their_funding_key)
 826                 } else {
 827                         builder.push_slice(&their_funding_key)
 828                                 .push_slice(&our_funding_key)
 829                 }.push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script()
 830         }
 831
 832         fn sign_commitment_transaction(&self, tx: &mut Transaction, their_sig: &Signature) -> Signature {
 833                 if tx.input.len() != 1 {
 834                         panic!("Tried to sign commitment transaction that had input count != 1!");
 835                 }
 836                 if tx.input[0].witness.len() != 0 {
 837                         panic!("Tried to re-sign commitment transaction");
 838                 }
 839
 840                 let funding_redeemscript = self.get_funding_redeemscript();
 841
 842                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
 843                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key).unwrap();
 844
 845                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
 846
 847                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap().serialize();
 848                 let their_funding_key = self.their_funding_pubkey.serialize();
 849                 if our_funding_key[..] < their_funding_key[..] {
 850                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
 851                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
 852                 } else {
 853                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
 854                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
 855                 }
 856                 tx.input[0].witness[1].push(SigHashType::All as u8);
 857                 tx.input[0].witness[2].push(SigHashType::All as u8);
 858
 859                 tx.input[0].witness.push(funding_redeemscript.into_vec());
 860
 861                 our_sig
 862         }
 863
 864         /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
 865         /// @local is used only to convert relevant internal structures which refer to remote vs local
 866         /// to decide value of outputs and direction of HTLCs.
 867         fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys) -> Transaction {
 868                 chan_utils::build_htlc_transaction(prev_hash, self.feerate_per_kw, if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
 869         }
 870
 871         fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), HandleError> {
 872                 if tx.input.len() != 1 {
 873                         panic!("Tried to sign HTLC transaction that had input count != 1!");
 874                 }
 875
 876                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
 877
 878                 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));
 879                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
 880                 let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key).unwrap() == keys.a_htlc_key;
 881                 Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key).unwrap(), is_local_tx))
 882         }
 883
 884         /// Signs a transaction created by build_htlc_transaction. If the transaction is an
 885         /// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
 886         fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, HandleError> {
 887                 if tx.input.len() != 1 {
 888                         panic!("Tried to sign HTLC transaction that had input count != 1!");
 889                 }
 890                 if tx.input[0].witness.len() != 0 {
 891                         panic!("Tried to re-sign HTLC transaction");
 892                 }
 893
 894                 let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
 895
 896                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
 897
 898                 if local_tx { // b, then a
 899                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
 900                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
 901                 } else {
 902                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
 903                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
 904                 }
 905                 tx.input[0].witness[1].push(SigHashType::All as u8);
 906                 tx.input[0].witness[2].push(SigHashType::All as u8);
 907
 908                 if htlc.offered {
 909                         tx.input[0].witness.push(Vec::new());
 910                 } else {
 911                         tx.input[0].witness.push(preimage.unwrap().to_vec());
 912                 }
 913
 914                 tx.input[0].witness.push(htlc_redeemscript.into_vec());
 915
 916                 Ok(our_sig)
 917         }
 918
 919         pub fn get_update_fulfill_htlc(&mut self, payment_preimage_arg: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, ChannelMonitor)>, HandleError> {
 920                 // Either ChannelFunded got set (which means it wont bet unset) or there is no way any
 921                 // caller thought we could have something claimed (cause we wouldn't have accepted in an
 922                 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
 923                 // either.
 924                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
 925                         panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
 926                 }
 927                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
 928
 929                 let mut sha = Sha256::new();
 930                 sha.input(&payment_preimage_arg);
 931                 let mut payment_hash_calc = [0; 32];
 932                 sha.result(&mut payment_hash_calc);
 933
 934                 // Now update local state:
 935                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
 936                         for pending_update in self.holding_cell_htlc_updates.iter() {
 937                                 match pending_update {
 938                                         &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, .. } => {
 939                                                 if payment_preimage_arg == *payment_preimage {
 940                                                         return Ok(None);
 941                                                 }
 942                                         },
 943                                         &HTLCUpdateAwaitingACK::FailHTLC { ref payment_hash, .. } => {
 944                                                 if payment_hash_calc == *payment_hash {
 945                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
 946                                                 }
 947                                         },
 948                                         _ => {}
 949                                 }
 950                         }
 951                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
 952                                 payment_preimage: payment_preimage_arg, payment_hash: payment_hash_calc,
 953                         });
 954                         return Ok(None);
 955                 }
 956
 957                 let mut htlc_id = 0;
 958                 let mut htlc_amount_msat = 0;
 959                 for htlc in self.pending_htlcs.iter_mut() {
 960                         if !htlc.outbound && htlc.payment_hash == payment_hash_calc {
 961                                 if htlc_id != 0 {
 962                                         panic!("Duplicate HTLC payment_hash, you probably re-used payment preimages, NEVER DO THIS!");
 963                                 }
 964                                 htlc_id = htlc.htlc_id;
 965                                 htlc_amount_msat += htlc.amount_msat;
 966                                 if htlc.state == HTLCState::Committed {
 967                                         htlc.state = HTLCState::LocalRemoved;
 968                                         htlc.local_removed_fulfilled = true;
 969                                 } else if htlc.state == HTLCState::RemoteAnnounced {
 970                                         panic!("Somehow forwarded HTLC prior to remote revocation!");
 971                                 } else if htlc.state == HTLCState::LocalRemoved || htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
 972                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
 973                                 } else {
 974                                         panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
 975                                 }
 976                         }
 977                 }
 978                 if htlc_amount_msat == 0 {
 979                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
 980                 }
 981                 self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
 982
 983                 Ok(Some((msgs::UpdateFulfillHTLC {
 984                         channel_id: self.channel_id(),
 985                         htlc_id: htlc_id,
 986                         payment_preimage: payment_preimage_arg,
 987                 }, self.channel_monitor.clone())))
 988         }
 989
 990         pub fn get_update_fulfill_htlc_and_commit(&mut self, payment_preimage: [u8; 32]) -> Result<Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
 991                 match self.get_update_fulfill_htlc(payment_preimage)? {
 992                         Some(update_fulfill_htlc) => {
 993                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
 994                                 Ok(Some((update_fulfill_htlc.0, commitment, monitor_update)))
 995                         },
 996                         None => Ok(None)
 997                 }
 998         }
 999
1000         pub fn get_update_fail_htlc(&mut self, payment_hash_arg: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, HandleError> {
1001                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1002                         return Err(HandleError{err: "Was asked to fail an HTLC when channel was not in an operational state", msg: None});
1003                 }
1004                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1005
1006                 // Now update local state:
1007                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
1008                         for pending_update in self.holding_cell_htlc_updates.iter() {
1009                                 match pending_update {
1010                                         &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_hash, .. } => {
1011                                                 if *payment_hash_arg == *payment_hash {
1012                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
1013                                                 }
1014                                         },
1015                                         &HTLCUpdateAwaitingACK::FailHTLC { ref payment_hash, .. } => {
1016                                                 if *payment_hash_arg == *payment_hash {
1017                                                         return Ok(None);
1018                                                 }
1019                                         },
1020                                         _ => {}
1021                                 }
1022                         }
1023                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1024                                 payment_hash: payment_hash_arg.clone(),
1025                                 err_packet,
1026                         });
1027                         return Ok(None);
1028                 }
1029
1030                 let mut htlc_id = 0;
1031                 let mut htlc_amount_msat = 0;
1032                 for htlc in self.pending_htlcs.iter_mut() {
1033                         if !htlc.outbound && htlc.payment_hash == *payment_hash_arg {
1034                                 if htlc_id != 0 {
1035                                         panic!("Duplicate HTLC payment_hash, you probably re-used payment preimages, NEVER DO THIS!");
1036                                 }
1037                                 htlc_id = htlc.htlc_id;
1038                                 htlc_amount_msat += htlc.amount_msat;
1039                                 if htlc.state == HTLCState::Committed {
1040                                         htlc.state = HTLCState::LocalRemoved;
1041                                 } else if htlc.state == HTLCState::RemoteAnnounced {
1042                                         panic!("Somehow forwarded HTLC prior to remote revocation!");
1043                                 } else if htlc.state == HTLCState::LocalRemoved || htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
1044                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
1045                                 } else {
1046                                         panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
1047                                 }
1048                         }
1049                 }
1050                 if htlc_amount_msat == 0 {
1051                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given payment preimage", msg: None});
1052                 }
1053
1054                 Ok(Some(msgs::UpdateFailHTLC {
1055                         channel_id: self.channel_id(),
1056                         htlc_id,
1057                         reason: err_packet
1058                 }))
1059         }
1060
1061         pub fn get_update_fail_htlc_and_commit(&mut self, payment_hash: &[u8; 32], err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
1062                 match self.get_update_fail_htlc(payment_hash, err_packet)? {
1063                         Some(update_fail_htlc) => {
1064                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1065                                 Ok(Some((update_fail_htlc, commitment, monitor_update)))
1066                         },
1067                         None => Ok(None)
1068                 }
1069         }
1070
1071         // Message handlers:
1072
1073         pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1074                 // Check sanity of message fields:
1075                 if !self.channel_outbound {
1076                         return Err(HandleError{err: "Got an accept_channel message from an inbound peer", msg: None});
1077                 }
1078                 if self.channel_state != ChannelState::OurInitSent as u32 {
1079                         return Err(HandleError{err: "Got an accept_channel message at a strange time", msg: None});
1080                 }
1081                 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1082                         return Err(HandleError{err: "Peer never wants payout outputs?", msg: None});
1083                 }
1084                 if msg.max_htlc_value_in_flight_msat > self.channel_value_satoshis * 1000 {
1085                         return Err(HandleError{err: "Bogus max_htlc_value_in_flight_satoshis", msg: None});
1086                 }
1087                 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1088                         return Err(HandleError{err: "Bogus channel_reserve_satoshis", msg: None});
1089                 }
1090                 if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
1091                         return Err(HandleError{err: "Minimum htlc value is full channel value", msg: None});
1092                 }
1093                 //TODO do something with minimum_depth
1094                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
1095                         return Err(HandleError{err: "They wanted our payments to be delayed by a needlessly long period", msg: None});
1096                 }
1097                 if msg.max_accepted_htlcs < 1 {
1098                         return Err(HandleError{err: "0 max_accpted_htlcs makes for a useless channel", msg: None});
1099                 }
1100
1101                 self.channel_monitor.set_their_htlc_base_key(&msg.htlc_basepoint);
1102
1103                 self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
1104                 self.their_max_htlc_value_in_flight_msat = msg.max_htlc_value_in_flight_msat;
1105                 self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
1106                 self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
1107                 self.their_to_self_delay = msg.to_self_delay;
1108                 self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
1109                 self.their_funding_pubkey = msg.funding_pubkey;
1110                 self.their_revocation_basepoint = msg.revocation_basepoint;
1111                 self.their_payment_basepoint = msg.payment_basepoint;
1112                 self.their_delayed_payment_basepoint = msg.delayed_payment_basepoint;
1113                 self.their_htlc_basepoint = msg.htlc_basepoint;
1114                 self.their_cur_commitment_point = msg.first_per_commitment_point;
1115
1116                 let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
1117                 self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
1118                 self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
1119
1120                 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1121
1122                 Ok(())
1123         }
1124
1125         fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, Signature), HandleError> {
1126                 let funding_script = self.get_funding_redeemscript();
1127
1128                 let remote_keys = self.build_remote_transaction_keys()?;
1129                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
1130                 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();
1131
1132                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1133                 let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
1134                 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();
1135
1136                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1137                 secp_call!(self.secp_ctx.verify(&local_sighash, &sig, &self.their_funding_pubkey), "Invalid funding_created signature from peer");
1138
1139                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
1140                 Ok((remote_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap()))
1141         }
1142
1143         pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), HandleError> {
1144                 if self.channel_outbound {
1145                         return Err(HandleError{err: "Received funding_created for an outbound channel?", msg: None});
1146                 }
1147                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1148                         return Err(HandleError{err: "Received funding_created after we got the channel!", msg: None});
1149                 }
1150                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
1151                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1152                 }
1153
1154                 let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
1155                 self.channel_monitor.set_funding_info(funding_txo);
1156
1157                 let (remote_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
1158                         Ok(res) => res,
1159                         Err(e) => {
1160                                 self.channel_monitor.unset_funding_info();
1161                                 return Err(e);
1162                         }
1163                 };
1164
1165                 // Now that we're past error-generating stuff, update our local state:
1166
1167                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
1168                 self.channel_state = ChannelState::FundingSent as u32;
1169                 self.channel_id = funding_txo.to_channel_id();
1170                 self.cur_remote_commitment_transaction_number -= 1;
1171                 self.cur_local_commitment_transaction_number -= 1;
1172
1173                 Ok((msgs::FundingSigned {
1174                         channel_id: self.channel_id,
1175                         signature: our_signature
1176                 }, self.channel_monitor.clone()))
1177         }
1178
1179         /// Handles a funding_signed message from the remote end.
1180         /// If this call is successful, broadcast the funding transaction (and not before!)
1181         pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, HandleError> {
1182                 if !self.channel_outbound {
1183                         return Err(HandleError{err: "Received funding_signed for an inbound channel?", msg: None});
1184                 }
1185                 if self.channel_state != ChannelState::FundingCreated as u32 {
1186                         return Err(HandleError{err: "Received funding_signed in strange state!", msg: None});
1187                 }
1188                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 2 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
1189                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1190                 }
1191
1192                 let funding_script = self.get_funding_redeemscript();
1193
1194                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1195                 let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
1196                 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();
1197
1198                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1199                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey), "Invalid funding_signed signature from peer");
1200
1201                 self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
1202                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
1203                 self.last_local_commitment_txn = vec![local_initial_commitment_tx];
1204                 self.channel_state = ChannelState::FundingSent as u32;
1205                 self.cur_local_commitment_transaction_number -= 1;
1206
1207                 Ok(self.channel_monitor.clone())
1208         }
1209
1210         pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), HandleError> {
1211                 let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
1212                 if non_shutdown_state == ChannelState::FundingSent as u32 {
1213                         self.channel_state |= ChannelState::TheirFundingLocked as u32;
1214                 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1215                         self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
1216                         self.channel_update_count += 1;
1217                 } else {
1218                         return Err(HandleError{err: "Peer sent a funding_locked at a strange time", msg: None});
1219                 }
1220
1221                 self.their_prev_commitment_point = Some(self.their_cur_commitment_point);
1222                 self.their_cur_commitment_point = msg.next_per_commitment_point;
1223                 Ok(())
1224         }
1225
1226         /// Returns (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
1227         /// If its for a remote update check, we need to be more lax about checking against messages we
1228         /// sent but they may not have received/processed before they sent this message. Further, for
1229         /// our own sends, we're more conservative and even consider things they've removed against
1230         /// totals, though there is little reason to outside of further avoiding any race condition
1231         /// issues.
1232         fn get_pending_htlc_stats(&self, for_remote_update_check: bool) -> (u32, u32, u64, u64) {
1233                 let mut inbound_htlc_count: u32 = 0;
1234                 let mut outbound_htlc_count: u32 = 0;
1235                 let mut htlc_outbound_value_msat = 0;
1236                 let mut htlc_inbound_value_msat = 0;
1237                 for ref htlc in self.pending_htlcs.iter() {
1238                         match htlc.state {
1239                                 HTLCState::RemoteAnnounced => {},
1240                                 HTLCState::AwaitingRemoteRevokeToAnnounce => {},
1241                                 HTLCState::AwaitingAnnouncedRemoteRevoke => {},
1242                                 HTLCState::LocalAnnounced => { if for_remote_update_check { continue; } },
1243                                 HTLCState::Committed => {},
1244                                 HTLCState::RemoteRemoved => { if for_remote_update_check { continue; } },
1245                                 HTLCState::AwaitingRemoteRevokeToRemove => { if for_remote_update_check { continue; } },
1246                                 HTLCState::AwaitingRemovedRemoteRevoke => { if for_remote_update_check { continue; } },
1247                                 HTLCState::LocalRemoved => {},
1248                                 HTLCState::LocalRemovedAwaitingCommitment => { if for_remote_update_check { continue; } },
1249                         }
1250                         if !htlc.outbound {
1251                                 inbound_htlc_count += 1;
1252                                 htlc_inbound_value_msat += htlc.amount_msat;
1253                         } else {
1254                                 outbound_htlc_count += 1;
1255                                 htlc_outbound_value_msat += htlc.amount_msat;
1256                         }
1257                 }
1258                 (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
1259         }
1260
1261         pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingForwardHTLCInfo) -> Result<(), HandleError> {
1262                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
1263                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
1264                 }
1265                 if msg.amount_msat > self.channel_value_satoshis * 1000 {
1266                         return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", msg: None});
1267                 }
1268                 if msg.amount_msat < self.our_htlc_minimum_msat {
1269                         return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", msg: None});
1270                 }
1271
1272                 let (inbound_htlc_count, _, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(true);
1273                 if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
1274                         return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", msg: None});
1275                 }
1276                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
1277                 // Check our_max_htlc_value_in_flight_msat
1278                 if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
1279                         return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", msg: None});
1280                 }
1281                 // Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
1282                 // the reserve_satoshis we told them to always have as direct payment so that they lose
1283                 // something if we punish them for broadcasting an old state).
1284                 if htlc_inbound_value_msat + htlc_outbound_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 {
1285                         return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", msg: None});
1286                 }
1287                 if self.next_remote_htlc_id != msg.htlc_id {
1288                         return Err(HandleError{err: "Remote skipped HTLC ID", msg: None});
1289                 }
1290                 if msg.cltv_expiry >= 500000000 {
1291                         return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", msg: None});
1292                 }
1293
1294                 //TODO: Check msg.cltv_expiry further? Do this in channel manager?
1295
1296                 // Now update local state:
1297                 self.next_remote_htlc_id += 1;
1298                 self.pending_htlcs.push(HTLCOutput {
1299                         outbound: false,
1300                         htlc_id: msg.htlc_id,
1301                         amount_msat: msg.amount_msat,
1302                         payment_hash: msg.payment_hash,
1303                         cltv_expiry: msg.cltv_expiry,
1304                         state: HTLCState::RemoteAnnounced,
1305                         fail_reason: None,
1306                         local_removed_fulfilled: false,
1307                         pending_forward_state: Some(pending_forward_state),
1308                 });
1309
1310                 Ok(())
1311         }
1312
1313         /// Removes an outbound HTLC which has been commitment_signed by the remote end
1314         #[inline]
1315         fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<[u8; 32], HandleError> {
1316                 for htlc in self.pending_htlcs.iter_mut() {
1317                         if htlc.outbound && htlc.htlc_id == htlc_id {
1318                                 match check_preimage {
1319                                         None => {},
1320                                         Some(payment_hash) =>
1321                                                 if payment_hash != htlc.payment_hash {
1322                                                         return Err(HandleError{err: "Remote tried to fulfill HTLC with an incorrect preimage", msg: None});
1323                                                 }
1324                                 };
1325                                 if htlc.state == HTLCState::LocalAnnounced {
1326                                         return Err(HandleError{err: "Remote tried to fulfill HTLC before it had been committed", msg: None});
1327                                 } else if htlc.state == HTLCState::Committed {
1328                                         htlc.state = HTLCState::RemoteRemoved;
1329                                         htlc.fail_reason = fail_reason;
1330                                 } else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove || htlc.state == HTLCState::AwaitingRemovedRemoteRevoke || htlc.state == HTLCState::RemoteRemoved {
1331                                         return Err(HandleError{err: "Remote tried to fulfill HTLC that they'd already fulfilled", msg: None});
1332                                 } else {
1333                                         panic!("Got a non-outbound state on an outbound HTLC");
1334                                 }
1335                                 return Ok(htlc.payment_hash.clone());
1336                         }
1337                 }
1338                 Err(HandleError{err: "Remote tried to fulfill/fail an HTLC we couldn't find", msg: None})
1339         }
1340
1341         pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<ChannelMonitor, HandleError> {
1342                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1343                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
1344                 }
1345
1346                 let mut sha = Sha256::new();
1347                 sha.input(&msg.payment_preimage);
1348                 let mut payment_hash = [0; 32];
1349                 sha.result(&mut payment_hash);
1350
1351                 self.channel_monitor.provide_payment_preimage(&payment_hash, &msg.payment_preimage);
1352                 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)?;
1353                 Ok(self.channel_monitor.clone())
1354         }
1355
1356         pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<[u8; 32], HandleError> {
1357                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1358                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
1359                 }
1360
1361                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1362         }
1363
1364         pub fn update_fail_malformed_htlc(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<(), HandleError> {
1365                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1366                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", msg: None});
1367                 }
1368
1369                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
1370                 Ok(())
1371         }
1372
1373         pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitor), HandleError> {
1374                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1375                         return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", msg: None});
1376                 }
1377
1378                 let funding_script = self.get_funding_redeemscript();
1379
1380                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1381                 let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false);
1382                 let local_commitment_txid = local_commitment_tx.0.txid();
1383                 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();
1384                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey), "Invalid commitment tx signature from peer");
1385
1386                 if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
1387                         return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", msg: None});
1388                 }
1389
1390                 let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
1391                 self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
1392                 new_local_commitment_txn.push(local_commitment_tx.0.clone());
1393
1394                 let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
1395                 for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
1396                         let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys);
1397                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
1398                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1399                         secp_call!(self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key), "Invalid HTLC tx siganture from peer");
1400                         let htlc_sig = if htlc.offered {
1401                                 let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
1402                                 new_local_commitment_txn.push(htlc_tx);
1403                                 htlc_sig
1404                         } else {
1405                                 self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
1406                         };
1407                         htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
1408                 }
1409
1410                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1)).unwrap();
1411                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
1412
1413                 // Update state now that we've passed all the can-fail calls...
1414                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
1415
1416                 let mut need_our_commitment = false;
1417                 for htlc in self.pending_htlcs.iter_mut() {
1418                         if htlc.state == HTLCState::RemoteAnnounced {
1419                                 htlc.state = HTLCState::AwaitingRemoteRevokeToAnnounce;
1420                                 need_our_commitment = true;
1421                         } else if htlc.state == HTLCState::RemoteRemoved {
1422                                 htlc.state = HTLCState::AwaitingRemoteRevokeToRemove;
1423                                 need_our_commitment = true;
1424                         }
1425                 }
1426                 // Finally delete all the LocalRemovedAwaitingCommitment HTLCs
1427                 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
1428                 let mut claimed_value_msat = 0;
1429                 self.pending_htlcs.retain(|htlc| {
1430                         if htlc.state == HTLCState::LocalRemovedAwaitingCommitment {
1431                                 claimed_value_msat += htlc.amount_msat;
1432                                 false
1433                         } else { true }
1434                 });
1435                 self.value_to_self_msat += claimed_value_msat;
1436
1437                 self.cur_local_commitment_transaction_number -= 1;
1438                 self.last_local_commitment_txn = new_local_commitment_txn;
1439
1440                 let (our_commitment_signed, monitor_update) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1441                         // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
1442                         // we'll send one right away when we get the revoke_and_ack when we
1443                         // free_holding_cell_htlcs().
1444                         let (msg, monitor) = self.send_commitment_no_status_check()?;
1445                         (Some(msg), monitor)
1446                 } else { (None, self.channel_monitor.clone()) };
1447
1448                 Ok((msgs::RevokeAndACK {
1449                         channel_id: self.channel_id,
1450                         per_commitment_secret: per_commitment_secret,
1451                         next_per_commitment_point: next_per_commitment_point,
1452                 }, our_commitment_signed, monitor_update))
1453         }
1454
1455         /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
1456         /// fulfilling or failing the last pending HTLC)
1457         fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, HandleError> {
1458                 if self.holding_cell_htlc_updates.len() != 0 {
1459                         let mut htlc_updates = Vec::new();
1460                         mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
1461                         let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
1462                         let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
1463                         let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
1464                         let mut err = None;
1465                         for htlc_update in htlc_updates.drain(..) {
1466                                 // Note that this *can* fail, though it should be due to rather-rare conditions on
1467                                 // fee races with adding too many outputs which push our total payments just over
1468                                 // the limit. In case its less rare than I anticipate, we may want to revisit
1469                                 // handling this case better and maybe fufilling some of the HTLCs while attempting
1470                                 // to rebalance channels.
1471                                 if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
1472                                         self.holding_cell_htlc_updates.push(htlc_update);
1473                                 } else {
1474                                         match &htlc_update {
1475                                                 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, payment_hash, ref onion_routing_packet, ..} => {
1476                                                         match self.send_htlc(amount_msat, payment_hash, cltv_expiry, onion_routing_packet.clone()) {
1477                                                                 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
1478                                                                 Err(e) => {
1479                                                                         err = Some(e);
1480                                                                 }
1481                                                         }
1482                                                 },
1483                                                 &HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, .. } => {
1484                                                         match self.get_update_fulfill_htlc(payment_preimage) {
1485                                                                 Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap().0),
1486                                                                 Err(e) => {
1487                                                                         err = Some(e);
1488                                                                 }
1489                                                         }
1490                                                 },
1491                                                 &HTLCUpdateAwaitingACK::FailHTLC { payment_hash, ref err_packet } => {
1492                                                         match self.get_update_fail_htlc(&payment_hash, err_packet.clone()) {
1493                                                                 Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
1494                                                                 Err(e) => {
1495                                                                         err = Some(e);
1496                                                                 }
1497                                                         }
1498                                                 },
1499                                         }
1500                                         if err.is_some() {
1501                                                 self.holding_cell_htlc_updates.push(htlc_update);
1502                                         }
1503                                 }
1504                         }
1505                         //TODO: Need to examine the type of err - if its a fee issue or similar we may want to
1506                         //fail it back the route, if its a temporary issue we can ignore it...
1507                         match err {
1508                                 None => {
1509                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1510                                         Ok(Some((msgs::CommitmentUpdate {
1511                                                 update_add_htlcs,
1512                                                 update_fulfill_htlcs,
1513                                                 update_fail_htlcs,
1514                                                 commitment_signed,
1515                                         }, monitor_update)))
1516                                 },
1517                                 Some(e) => Err(e)
1518                         }
1519                 } else {
1520                         Ok(None)
1521                 }
1522         }
1523
1524         /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
1525         /// commitment_signed message here in case we had pending outbound HTLCs to add which were
1526         /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
1527         /// generating an appropriate error *after* the channel state has been updated based on the
1528         /// revoke_and_ack message.
1529         pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<PendingForwardHTLCInfo>, Vec<([u8; 32], HTLCFailReason)>, ChannelMonitor), HandleError> {
1530                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1531                         return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", msg: None});
1532                 }
1533                 if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
1534                         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")).unwrap() != their_prev_commitment_point {
1535                                 return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", msg: None});
1536                         }
1537                 }
1538                 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)))?;
1539
1540                 // Update state now that we've passed all the can-fail calls...
1541                 // (note that we may still fail to generate the new commitment_signed message, but that's
1542                 // OK, we step the channel here and *then* if the new generation fails we can fail the
1543                 // channel based on that, but stepping stuff here should be safe either way.
1544                 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
1545                 self.their_prev_commitment_point = Some(self.their_cur_commitment_point);
1546                 self.their_cur_commitment_point = msg.next_per_commitment_point;
1547                 self.cur_remote_commitment_transaction_number -= 1;
1548
1549                 let mut to_forward_infos = Vec::new();
1550                 let mut revoked_htlcs = Vec::new();
1551                 let mut require_commitment = false;
1552                 let mut value_to_self_msat_diff: i64 = 0;
1553                 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
1554                 self.pending_htlcs.retain(|htlc| {
1555                         if htlc.state == HTLCState::LocalRemoved {
1556                                 if htlc.local_removed_fulfilled { true } else { false }
1557                         } else if htlc.state == HTLCState::AwaitingRemovedRemoteRevoke {
1558                                 if let Some(reason) = htlc.fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
1559                                         revoked_htlcs.push((htlc.payment_hash, reason));
1560                                 } else {
1561                                         // They fulfilled, so we sent them money
1562                                         value_to_self_msat_diff -= htlc.amount_msat as i64;
1563                                 }
1564                                 false
1565                         } else { true }
1566                 });
1567                 for htlc in self.pending_htlcs.iter_mut() {
1568                         if htlc.state == HTLCState::LocalAnnounced {
1569                                 htlc.state = HTLCState::Committed;
1570                         } else if htlc.state == HTLCState::AwaitingRemoteRevokeToAnnounce {
1571                                 htlc.state = HTLCState::AwaitingAnnouncedRemoteRevoke;
1572                                 require_commitment = true;
1573                         } else if htlc.state == HTLCState::AwaitingAnnouncedRemoteRevoke {
1574                                 htlc.state = HTLCState::Committed;
1575                                 to_forward_infos.push(htlc.pending_forward_state.take().unwrap());
1576                         } else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove {
1577                                 htlc.state = HTLCState::AwaitingRemovedRemoteRevoke;
1578                                 require_commitment = true;
1579                         } else if htlc.state == HTLCState::LocalRemoved {
1580                                 assert!(htlc.local_removed_fulfilled);
1581                                 htlc.state = HTLCState::LocalRemovedAwaitingCommitment;
1582                         }
1583                 }
1584                 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
1585
1586                 match self.free_holding_cell_htlcs()? {
1587                         Some(commitment_update) => {
1588                                 Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, commitment_update.1))
1589                         },
1590                         None => {
1591                                 if require_commitment {
1592                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1593                                         Ok((Some(msgs::CommitmentUpdate {
1594                                                 update_add_htlcs: Vec::new(),
1595                                                 update_fulfill_htlcs: Vec::new(),
1596                                                 update_fail_htlcs: Vec::new(),
1597                                                 commitment_signed
1598                                         }), to_forward_infos, revoked_htlcs, monitor_update))
1599                                 } else {
1600                                         Ok((None, to_forward_infos, revoked_htlcs, self.channel_monitor.clone()))
1601                                 }
1602                         }
1603                 }
1604         }
1605
1606         pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1607                 if self.channel_outbound {
1608                         return Err(HandleError{err: "Non-funding remote tried to update channel fee", msg: None});
1609                 }
1610                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
1611                 self.channel_update_count += 1;
1612                 self.feerate_per_kw = msg.feerate_per_kw as u64;
1613                 Ok(())
1614         }
1615
1616         pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<[u8; 32]>), HandleError> {
1617                 if self.channel_state < ChannelState::FundingSent as u32 {
1618                         self.channel_state = ChannelState::ShutdownComplete as u32;
1619                         self.channel_update_count += 1;
1620                         return Ok((None, None, Vec::new()));
1621                 }
1622                 for htlc in self.pending_htlcs.iter() {
1623                         if htlc.state == HTLCState::RemoteAnnounced {
1624                                 return Err(HandleError{err: "Got shutdown with remote pending HTLCs", msg: None});
1625                         }
1626                 }
1627                 if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
1628                         return Err(HandleError{err: "Remote peer sent duplicate shutdown message", msg: None});
1629                 }
1630                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1631
1632                 // BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
1633                 // 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
1634                 if self.channel_outbound && msg.scriptpubkey.len() > 34 {
1635                         return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", msg: None});
1636                 }
1637                 //TODO: Check shutdown_scriptpubkey form as BOLT says we must? WHYYY
1638
1639                 if self.their_shutdown_scriptpubkey.is_some() {
1640                         if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
1641                                 return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", msg: None});
1642                         }
1643                 } else {
1644                         self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
1645                 }
1646
1647                 let our_closing_script = self.get_closing_scriptpubkey();
1648
1649                 let (proposed_feerate, proposed_fee, our_sig) = if self.channel_outbound && self.pending_htlcs.is_empty() {
1650                         let mut proposed_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
1651                         if self.feerate_per_kw > proposed_feerate * 250 {
1652                                 proposed_feerate = self.feerate_per_kw / 250;
1653                         }
1654                         let tx_weight = Self::get_closing_transaction_weight(&our_closing_script, &msg.scriptpubkey);
1655                         let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 4;
1656
1657                         let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
1658                         let funding_redeemscript = self.get_funding_redeemscript();
1659                         let sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1660
1661                         (Some(proposed_feerate), Some(total_fee_satoshis), Some(self.secp_ctx.sign(&sighash, &self.local_keys.funding_key).unwrap()))
1662                 } else { (None, None, None) };
1663
1664                 // From here on out, we may not fail!
1665
1666                 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
1667                 self.channel_update_count += 1;
1668
1669                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
1670                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
1671                 // cell HTLCs and return them to fail the payment.
1672                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
1673                 self.holding_cell_htlc_updates.retain(|htlc_update| {
1674                         match htlc_update {
1675                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, .. } => {
1676                                         dropped_outbound_htlcs.push(payment_hash.clone());
1677                                         false
1678                                 },
1679                                 _ => true
1680                         }
1681                 });
1682                 for htlc in self.pending_htlcs.iter() {
1683                         if htlc.state == HTLCState::LocalAnnounced {
1684                                 return Ok((None, None, dropped_outbound_htlcs));
1685                         }
1686                 }
1687
1688                 let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
1689                         None
1690                 } else {
1691                         Some(msgs::Shutdown {
1692                                 channel_id: self.channel_id,
1693                                 scriptpubkey: our_closing_script,
1694                         })
1695                 };
1696
1697                 self.channel_state |= ChannelState::LocalShutdownSent as u32;
1698                 self.channel_update_count += 1;
1699                 if self.pending_htlcs.is_empty() && self.channel_outbound {
1700                         // There are no more HTLCs and we're the funder, this means we start the closing_signed
1701                         // dance with an initial fee proposal!
1702                         self.last_sent_closing_fee = Some((proposed_feerate.unwrap(), proposed_fee.unwrap()));
1703                         Ok((our_shutdown, Some(msgs::ClosingSigned {
1704                                 channel_id: self.channel_id,
1705                                 fee_satoshis: proposed_fee.unwrap(),
1706                                 signature: our_sig.unwrap(),
1707                         }), dropped_outbound_htlcs))
1708                 } else {
1709                         Ok((our_shutdown, None, dropped_outbound_htlcs))
1710                 }
1711         }
1712
1713         pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), HandleError> {
1714                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
1715                         return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", msg: None});
1716                 }
1717                 if !self.pending_htlcs.is_empty() {
1718                         return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", msg: None});
1719                 }
1720                 if msg.fee_satoshis > 21000000 * 10000000 {
1721                         return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", msg: None});
1722                 }
1723
1724                 let funding_redeemscript = self.get_funding_redeemscript();
1725                 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
1726                 if used_total_fee != msg.fee_satoshis {
1727                         return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", msg: None});
1728                 }
1729                 let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1730
1731                 match self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey) {
1732                         Ok(_) => {},
1733                         Err(_) => {
1734                                 // The remote end may have decided to revoke their output due to inconsistent dust
1735                                 // limits, so check for that case by re-checking the signature here.
1736                                 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
1737                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1738                                 secp_call!(self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey), "Invalid closing tx signature from peer");
1739                         },
1740                 };
1741
1742                 if let Some((_, last_fee)) = self.last_sent_closing_fee {
1743                         if last_fee == msg.fee_satoshis {
1744                                 self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
1745                                 self.channel_state = ChannelState::ShutdownComplete as u32;
1746                                 self.channel_update_count += 1;
1747                                 return Ok((None, Some(closing_tx)));
1748                         }
1749                 }
1750
1751                 macro_rules! propose_new_feerate {
1752                         ($new_feerate: expr) => {
1753                                 let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
1754                                 let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 4, false);
1755                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1756                                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key).unwrap();
1757                                 self.last_sent_closing_fee = Some(($new_feerate, used_total_fee));
1758                                 return Ok((Some(msgs::ClosingSigned {
1759                                         channel_id: self.channel_id,
1760                                         fee_satoshis: used_total_fee,
1761                                         signature: our_sig,
1762                                 }), None))
1763                         }
1764                 }
1765
1766                 let proposed_sat_per_vbyte = msg.fee_satoshis * 4 / closing_tx.get_weight();
1767                 if self.channel_outbound {
1768                         let our_max_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal);
1769                         if proposed_sat_per_vbyte > our_max_feerate {
1770                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
1771                                         if our_max_feerate <= last_feerate {
1772                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", msg: None});
1773                                         }
1774                                 }
1775                                 propose_new_feerate!(our_max_feerate);
1776                         }
1777                 } else {
1778                         let our_min_feerate = fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background);
1779                         if proposed_sat_per_vbyte < our_min_feerate {
1780                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
1781                                         if our_min_feerate >= last_feerate {
1782                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", msg: None});
1783                                         }
1784                                 }
1785                                 propose_new_feerate!(our_min_feerate);
1786                         }
1787                 }
1788
1789                 let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
1790                 self.channel_state = ChannelState::ShutdownComplete as u32;
1791                 self.channel_update_count += 1;
1792
1793                 Ok((Some(msgs::ClosingSigned {
1794                         channel_id: self.channel_id,
1795                         fee_satoshis: msg.fee_satoshis,
1796                         signature: our_sig,
1797                 }), Some(closing_tx)))
1798         }
1799
1800         // Public utilities:
1801
1802         pub fn channel_id(&self) -> Uint256 {
1803                 self.channel_id
1804         }
1805
1806         /// Gets the "user_id" value passed into the construction of this channel. It has no special
1807         /// meaning and exists only to allow users to have a persistent identifier of a channel.
1808         pub fn get_user_id(&self) -> u64 {
1809                 self.user_id
1810         }
1811
1812         pub fn channel_monitor(&self) -> ChannelMonitor {
1813                 if self.channel_state < ChannelState::FundingCreated as u32 {
1814                         panic!("Can't get a channel monitor until funding has been created");
1815                 }
1816                 self.channel_monitor.clone()
1817         }
1818
1819         /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
1820         /// is_usable() returns true).
1821         pub fn get_short_channel_id(&self) -> Option<u64> {
1822                 self.short_channel_id
1823         }
1824
1825         /// Returns the funding_txo we either got from our peer, or were given by
1826         /// get_outbound_funding_created.
1827         pub fn get_funding_txo(&self) -> Option<OutPoint> {
1828                 self.channel_monitor.get_funding_txo()
1829         }
1830
1831         pub fn get_their_node_id(&self) -> PublicKey {
1832                 self.their_node_id
1833         }
1834
1835         pub fn get_our_htlc_minimum_msat(&self) -> u64 {
1836                 self.our_htlc_minimum_msat
1837         }
1838
1839         pub fn get_value_satoshis(&self) -> u64 {
1840                 self.channel_value_satoshis
1841         }
1842
1843         pub fn get_channel_update_count(&self) -> u32 {
1844                 self.channel_update_count
1845         }
1846
1847         /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
1848         pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
1849                 // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
1850                 // output value back into a transaction with the regular channel output:
1851
1852                 // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
1853                 let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT);
1854
1855                 if self.channel_outbound {
1856                         // + the marginal fee increase cost to us in the commitment transaction:
1857                         res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC;
1858                 }
1859
1860                 // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
1861                 res += fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT * 250;
1862
1863                 res as u32
1864         }
1865
1866         /// Returns true if this channel is fully established and not known to be closing.
1867         pub fn is_usable(&self) -> bool {
1868                 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
1869                 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
1870         }
1871
1872         /// Returns true if this channel is currently available for use. This is a superset of
1873         /// is_usable() and considers things like the channel being temporarily disabled.
1874         pub fn is_live(&self) -> bool {
1875                 self.is_usable()
1876         }
1877
1878         /// Returns true if this channel is fully shut down. True here implies that no further actions
1879         /// may/will be taken on this channel, and thus this object should be freed. Any future changes
1880         /// will be handled appropriately by the chain monitor.
1881         pub fn is_shutdown(&self) -> bool {
1882                 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32  {
1883                         assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
1884                         true
1885                 } else { false }
1886         }
1887
1888         /// Called by channelmanager based on chain blocks being connected.
1889         /// Note that we only need to use this to detect funding_signed, anything else is handled by
1890         /// the channel_monitor.
1891         pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Option<msgs::FundingLocked> {
1892                 let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
1893                 if self.funding_tx_confirmations > 0 {
1894                         if header.bitcoin_hash() != self.last_block_connected {
1895                                 self.last_block_connected = header.bitcoin_hash();
1896                                 self.funding_tx_confirmations += 1;
1897                                 if self.funding_tx_confirmations == CONF_TARGET as u64 {
1898                                         if non_shutdown_state == ChannelState::FundingSent as u32 {
1899                                                 self.channel_state |= ChannelState::OurFundingLocked as u32;
1900                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
1901                                                 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
1902                                                 self.channel_update_count += 1;
1903                                                 //TODO: Something about a state where we "lost confirmation"
1904                                         } else if self.channel_state < ChannelState::ChannelFunded as u32 {
1905                                                 panic!("Started confirming a channel in a state pre-FundingSent?");
1906                                         }
1907                                         self.funding_tx_confirmed_in = header.bitcoin_hash();
1908
1909                                         //TODO: Note that this must be a duplicate of the previous commitment point they sent us,
1910                                         //as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
1911                                         //they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
1912                                         //a protocol oversight, but I assume I'm just missing something.
1913                                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
1914                                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret).unwrap();
1915                                         return Some(msgs::FundingLocked {
1916                                                 channel_id: self.channel_id,
1917                                                 next_per_commitment_point: next_per_commitment_point,
1918                                         });
1919                                 }
1920                         }
1921                 }
1922                 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
1923                         for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
1924                                 if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().txid {
1925                                         let txo_idx = self.channel_monitor.get_funding_txo().unwrap().index as usize;
1926                                         if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
1927                                                 tx.output[txo_idx].value != self.channel_value_satoshis {
1928                                                 self.channel_state = ChannelState::ShutdownComplete as u32;
1929                                                 self.channel_update_count += 1;
1930                                         } else {
1931                                                 self.funding_tx_confirmations = 1;
1932                                                 self.short_channel_id = Some(((height as u64)          << (5*8)) |
1933                                                                              ((*index_in_block as u64) << (2*8)) |
1934                                                                              ((txo_idx as u64)         << (0*8)));
1935                                         }
1936                                 }
1937                         }
1938                 }
1939                 None
1940         }
1941
1942         /// Called by channelmanager based on chain blocks being disconnected.
1943         /// Returns true if we need to close the channel now due to funding transaction
1944         /// unconfirmation/reorg.
1945         pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
1946                 if self.funding_tx_confirmations > 0 {
1947                         self.funding_tx_confirmations -= 1;
1948                         if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
1949                                 return true;
1950                         }
1951                 }
1952                 if header.bitcoin_hash() == self.funding_tx_confirmed_in {
1953                         self.funding_tx_confirmations = CONF_TARGET as u64 - 1;
1954                 }
1955                 false
1956         }
1957
1958         // Methods to get unprompted messages to send to the remote end (or where we already returned
1959         // something in the handler for the message that prompted this message):
1960
1961         pub fn get_open_channel(&self, chain_hash: Sha256dHash, fee_estimator: &FeeEstimator) -> Result<msgs::OpenChannel, HandleError> {
1962                 if !self.channel_outbound {
1963                         panic!("Tried to open a channel for an inbound channel?");
1964                 }
1965                 if self.channel_state != ChannelState::OurInitSent as u32 {
1966                         return Err(HandleError{err: "Cannot generate an open_channel after we've moved forward", msg: None});
1967                 }
1968
1969                 if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
1970                         panic!("Tried to send an open_channel for a channel that has already advanced");
1971                 }
1972
1973                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
1974
1975                 Ok(msgs::OpenChannel {
1976                         chain_hash: chain_hash,
1977                         temporary_channel_id: self.channel_id,
1978                         funding_satoshis: self.channel_value_satoshis,
1979                         push_msat: 0, //TODO: Something about feerate?
1980                         dust_limit_satoshis: self.our_dust_limit_satoshis,
1981                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
1982                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
1983                         htlc_minimum_msat: self.our_htlc_minimum_msat,
1984                         feerate_per_kw: fee_estimator.get_est_sat_per_vbyte(ConfirmationTarget::Background) as u32 * 250,
1985                         to_self_delay: BREAKDOWN_TIMEOUT,
1986                         max_accepted_htlcs: OUR_MAX_HTLCS,
1987                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap(),
1988                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key).unwrap(),
1989                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap(),
1990                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key).unwrap(),
1991                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap(),
1992                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret).unwrap(),
1993                         channel_flags: if self.announce_publicly {1} else {0},
1994                         shutdown_scriptpubkey: None,
1995                 })
1996         }
1997
1998         pub fn get_accept_channel(&self) -> Result<msgs::AcceptChannel, HandleError> {
1999                 if self.channel_outbound {
2000                         panic!("Tried to send accept_channel for an outbound channel?");
2001                 }
2002                 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
2003                         panic!("Tried to send accept_channel after channel had moved forward");
2004                 }
2005                 if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
2006                         panic!("Tried to send an accept_channel for a channel that has already advanced");
2007                 }
2008
2009                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2010
2011                 Ok(msgs::AcceptChannel {
2012                         temporary_channel_id: self.channel_id,
2013                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2014                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2015                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2016                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2017                         minimum_depth: CONF_TARGET,
2018                         to_self_delay: BREAKDOWN_TIMEOUT,
2019                         max_accepted_htlcs: OUR_MAX_HTLCS,
2020                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap(),
2021                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key).unwrap(),
2022                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key).unwrap(),
2023                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key).unwrap(),
2024                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key).unwrap(),
2025                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret).unwrap(),
2026                         shutdown_scriptpubkey: None,
2027                 })
2028         }
2029
2030         fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), HandleError> {
2031                 let funding_script = self.get_funding_redeemscript();
2032
2033                 let remote_keys = self.build_remote_transaction_keys()?;
2034                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
2035                 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();
2036
2037                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
2038                 Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap(), remote_initial_commitment_tx))
2039         }
2040
2041         /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
2042         /// a funding_created message for the remote peer.
2043         /// Panics if called at some time other than immediately after initial handshake, if called twice,
2044         /// or if called on an inbound channel.
2045         /// Note that channel_id changes during this call!
2046         /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
2047         pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor), HandleError> {
2048                 if !self.channel_outbound {
2049                         panic!("Tried to create outbound funding_created message on an inbound channel!");
2050                 }
2051                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
2052                         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)");
2053                 }
2054                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
2055                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
2056                 }
2057
2058                 self.channel_monitor.set_funding_info(funding_txo);
2059
2060                 let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
2061                         Ok(res) => res,
2062                         Err(e) => {
2063                                 self.channel_monitor.unset_funding_info();
2064                                 return Err(e);
2065                         }
2066                 };
2067
2068                 let temporary_channel_id = self.channel_id;
2069
2070                 // Now that we're past error-generating stuff, update our local state:
2071                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
2072                 self.channel_state = ChannelState::FundingCreated as u32;
2073                 self.channel_id = funding_txo.to_channel_id();
2074                 self.cur_remote_commitment_transaction_number -= 1;
2075
2076                 Ok((msgs::FundingCreated {
2077                         temporary_channel_id: temporary_channel_id,
2078                         funding_txid: funding_txo.txid,
2079                         funding_output_index: funding_txo.index,
2080                         signature: our_signature
2081                 }, self.channel_monitor.clone()))
2082         }
2083
2084         /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
2085         /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
2086         /// available for use (have exchanged FundingLocked messages in both directions. Should be used
2087         /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
2088         /// Note that you can get an announcement for a channel which is closing, though you should
2089         /// likely not announce such a thing. In case its already been announced, a channel_update
2090         /// message can mark the channel disabled.
2091         pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), HandleError> {
2092                 if !self.announce_publicly {
2093                         return Err(HandleError{err: "Channel is not available for public announcements", msg: None});
2094                 }
2095                 if self.channel_state & (ChannelState::ChannelFunded as u32) != (ChannelState::ChannelFunded as u32) {
2096                         return Err(HandleError{err: "Cannot get a ChannelAnnouncement until the channel funding has been locked", msg: None});
2097                 }
2098
2099                 let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
2100                 let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).unwrap();
2101
2102                 let msg = msgs::UnsignedChannelAnnouncement {
2103                         features: msgs::GlobalFeatures::new(),
2104                         chain_hash: chain_hash,
2105                         short_channel_id: self.get_short_channel_id().unwrap(),
2106                         node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
2107                         node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
2108                         bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey },
2109                         bitcoin_key_2: if were_node_one { self.their_funding_pubkey } else { our_bitcoin_key },
2110                 };
2111
2112                 let msghash = Message::from_slice(&Sha256dHash::from_data(&msg.encode()[..])[..]).unwrap();
2113                 let sig = self.secp_ctx.sign(&msghash, &self.local_keys.funding_key).unwrap();
2114
2115                 Ok((msg, sig))
2116         }
2117
2118
2119         // Send stuff to our remote peers:
2120
2121         /// Adds a pending outbound HTLC to this channel, note that you probably want
2122         /// send_htlc_and_commit instead cause you'll want both messages at once.
2123         /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
2124         /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
2125         /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
2126         pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, HandleError> {
2127                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
2128                         return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", msg: None});
2129                 }
2130
2131                 if amount_msat > self.channel_value_satoshis * 1000 {
2132                         return Err(HandleError{err: "Cannot send more than the total value of the channel", msg: None});
2133                 }
2134                 if amount_msat < self.their_htlc_minimum_msat {
2135                         return Err(HandleError{err: "Cannot send less than their minimum HTLC value", msg: None});
2136                 }
2137
2138                 let (_, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(false);
2139                 if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
2140                         return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", msg: None});
2141                 }
2142                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
2143                 // Check their_max_htlc_value_in_flight_msat
2144                 if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
2145                         return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", msg: None});
2146                 }
2147                 // Check their_channel_reserve_satoshis:
2148                 if htlc_inbound_value_msat + htlc_outbound_value_msat + amount_msat + (self.channel_value_satoshis * 1000 - self.value_to_self_msat) > (self.channel_value_satoshis - self.their_channel_reserve_satoshis) * 1000 {
2149                         return Err(HandleError{err: "Cannot send value that would put us over our reserve value", msg: None});
2150                 }
2151
2152                 //TODO: Check cltv_expiry? Do this in channel manager?
2153
2154                 // Now update local state:
2155                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2156                         //TODO: Check the limits *including* other pending holding cell HTLCs!
2157                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
2158                                 amount_msat: amount_msat,
2159                                 payment_hash: payment_hash,
2160                                 cltv_expiry: cltv_expiry,
2161                                 onion_routing_packet: onion_routing_packet,
2162                                 time_created: Instant::now(),
2163                         });
2164                         return Ok(None);
2165                 }
2166
2167                 self.pending_htlcs.push(HTLCOutput {
2168                         outbound: true,
2169                         htlc_id: self.next_local_htlc_id,
2170                         amount_msat: amount_msat,
2171                         payment_hash: payment_hash.clone(),
2172                         cltv_expiry: cltv_expiry,
2173                         state: HTLCState::LocalAnnounced,
2174                         fail_reason: None,
2175                         local_removed_fulfilled: false,
2176                         pending_forward_state: None
2177                 });
2178
2179                 let res = msgs::UpdateAddHTLC {
2180                         channel_id: self.channel_id,
2181                         htlc_id: self.next_local_htlc_id,
2182                         amount_msat: amount_msat,
2183                         payment_hash: payment_hash,
2184                         cltv_expiry: cltv_expiry,
2185                         onion_routing_packet: onion_routing_packet,
2186                 };
2187                 self.next_local_htlc_id += 1;
2188
2189                 Ok(Some(res))
2190         }
2191
2192         /// Creates a signed commitment transaction to send to the remote peer.
2193         pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
2194                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2195                         return Err(HandleError{err: "Cannot create commitment tx until channel is fully established", msg: None});
2196                 }
2197                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2198                         return Err(HandleError{err: "Cannot create commitment tx until remote revokes their previous commitment", msg: None});
2199                 }
2200                 let mut have_updates = false; // TODO initialize with "have we sent a fee update?"
2201                 for htlc in self.pending_htlcs.iter() {
2202                         if htlc.state == HTLCState::LocalAnnounced {
2203                                 have_updates = true;
2204                         }
2205                         if have_updates { break; }
2206                 }
2207                 if !have_updates {
2208                         return Err(HandleError{err: "Cannot create commitment tx until we have some updates to send", msg: None});
2209                 }
2210                 self.send_commitment_no_status_check()
2211         }
2212         /// Only fails in case of bad keys
2213         fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
2214                 let funding_script = self.get_funding_redeemscript();
2215
2216                 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
2217                 // fail to generate this, we still are at least at a position where upgrading their status
2218                 // is acceptable.
2219                 for htlc in self.pending_htlcs.iter_mut() {
2220                         if htlc.state == HTLCState::AwaitingRemoteRevokeToAnnounce {
2221                                 htlc.state = HTLCState::AwaitingAnnouncedRemoteRevoke;
2222                         } else if htlc.state == HTLCState::AwaitingRemoteRevokeToRemove {
2223                                 htlc.state = HTLCState::AwaitingRemovedRemoteRevoke;
2224                         }
2225                 }
2226
2227                 let remote_keys = self.build_remote_transaction_keys()?;
2228                 let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true);
2229                 let remote_commitment_txid = remote_commitment_tx.0.txid();
2230                 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();
2231                 let our_sig = self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key).unwrap();
2232
2233                 let mut htlc_sigs = Vec::new();
2234
2235                 for ref htlc in remote_commitment_tx.1.iter() {
2236                         let htlc_tx = self.build_htlc_transaction(&remote_commitment_txid, htlc, false, &remote_keys);
2237                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &remote_keys);
2238                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
2239                         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));
2240                         htlc_sigs.push(self.secp_ctx.sign(&htlc_sighash, &our_htlc_key).unwrap());
2241                 }
2242
2243                 // Update state now that we've passed all the can-fail calls...
2244                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1, self.cur_remote_commitment_transaction_number);
2245                 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
2246
2247                 Ok((msgs::CommitmentSigned {
2248                         channel_id: self.channel_id,
2249                         signature: our_sig,
2250                         htlc_signatures: htlc_sigs,
2251                 }, self.channel_monitor.clone()))
2252         }
2253
2254         /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
2255         /// to send to the remote peer in one go.
2256         /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
2257         /// more info.
2258         pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
2259                 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, onion_routing_packet)? {
2260                         Some(update_add_htlc) => {
2261                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2262                                 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
2263                         },
2264                         None => Ok(None)
2265                 }
2266         }
2267
2268         /// Begins the shutdown process, getting a message for the remote peer and returning all
2269         /// holding cell HTLCs for payment failure.
2270         pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<[u8; 32]>), HandleError> {
2271                 for htlc in self.pending_htlcs.iter() {
2272                         if htlc.state == HTLCState::LocalAnnounced {
2273                                 return Err(HandleError{err: "Cannot begin shutdown with pending HTLCs, call send_commitment first", msg: None});
2274                         }
2275                 }
2276                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
2277                         return Err(HandleError{err: "Shutdown already in progress", msg: None});
2278                 }
2279                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2280
2281                 let our_closing_script = self.get_closing_scriptpubkey();
2282
2283                 // From here on out, we may not fail!
2284                 if self.channel_state < ChannelState::FundingSent as u32 {
2285                         self.channel_state = ChannelState::ShutdownComplete as u32;
2286                 } else {
2287                         self.channel_state |= ChannelState::LocalShutdownSent as u32;
2288                 }
2289                 self.channel_update_count += 1;
2290
2291                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2292                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2293                 // cell HTLCs and return them to fail the payment.
2294                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2295                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2296                         match htlc_update {
2297                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, .. } => {
2298                                         dropped_outbound_htlcs.push(payment_hash.clone());
2299                                         false
2300                                 },
2301                                 _ => true
2302                         }
2303                 });
2304
2305                 Ok((msgs::Shutdown {
2306                         channel_id: self.channel_id,
2307                         scriptpubkey: our_closing_script,
2308                 }, dropped_outbound_htlcs))
2309         }
2310
2311         /// Gets the latest commitment transaction and any dependant transactions for relay (forcing
2312         /// shutdown of this channel - no more calls into this Channel may be made afterwards.
2313         pub fn force_shutdown(&mut self) -> Vec<Transaction> {
2314                 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
2315                 self.channel_state = ChannelState::ShutdownComplete as u32;
2316                 self.channel_update_count += 1;
2317                 let mut res = Vec::new();
2318                 mem::swap(&mut res, &mut self.last_local_commitment_txn);
2319                 res
2320         }
2321 }
2322
2323 #[cfg(test)]
2324 mod tests {
2325         use bitcoin::util::misc::hex_bytes;
2326         use bitcoin::util::hash::Sha256dHash;
2327         use bitcoin::util::bip143;
2328         use bitcoin::network::serialize::serialize;
2329         use bitcoin::blockdata::transaction::Transaction;
2330         use ln::channel::{Channel,ChannelKeys,HTLCOutput,HTLCState,HTLCOutputInCommitment,TxCreationKeys};
2331         use ln::channel::MAX_FUNDING_SATOSHIS;
2332         use ln::chan_utils;
2333         use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
2334         use chain::transaction::OutPoint;
2335         use secp256k1::{Secp256k1,Message,Signature};
2336         use secp256k1::key::{SecretKey,PublicKey};
2337         use crypto::sha2::Sha256;
2338         use crypto::digest::Digest;
2339
2340         struct TestFeeEstimator {
2341                 fee_est: u64
2342         }
2343         impl FeeEstimator for TestFeeEstimator {
2344                 fn get_est_sat_per_vbyte(&self, _: ConfirmationTarget) -> u64 {
2345                         self.fee_est
2346                 }
2347         }
2348
2349         #[test]
2350         fn test_max_funding_satoshis() {
2351                 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
2352                         "MAX_FUNDING_SATOSHIS is greater than all satoshis on existence");
2353         }
2354
2355         #[test]
2356         fn outbound_commitment_test() {
2357                 // Test vectors from BOLT 3 Appendix C:
2358                 let feeest = TestFeeEstimator{fee_est: 15000/250};
2359                 let secp_ctx = Secp256k1::new();
2360
2361                 let chan_keys = ChannelKeys {
2362                         funding_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
2363                         payment_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
2364                         delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
2365                         htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
2366
2367                         // These aren't set in the test vectors:
2368                         revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2369                         channel_close_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2370                         channel_monitor_claim_key: SecretKey::from_slice(&secp_ctx, &hex_bytes("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2371                         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],
2372                 };
2373                 assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).unwrap().serialize()[..],
2374                                 hex_bytes("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
2375
2376                 let mut chan = Channel::new_outbound(&feeest, chan_keys, PublicKey::new(), 10000000, false, 42); // Nothing uses their network key in this test
2377                 chan.their_to_self_delay = 144;
2378                 chan.our_dust_limit_satoshis = 546;
2379
2380                 let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
2381                 chan.channel_monitor.set_funding_info(funding_info);
2382
2383                 chan.their_payment_basepoint = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()).unwrap();
2384                 assert_eq!(chan.their_payment_basepoint.serialize()[..],
2385                                 hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
2386
2387                 chan.their_funding_pubkey = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13").unwrap()[..]).unwrap()).unwrap();
2388                 assert_eq!(chan.their_funding_pubkey.serialize()[..],
2389                                 hex_bytes("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
2390
2391                 chan.their_htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex_bytes("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()).unwrap();
2392                 assert_eq!(chan.their_htlc_basepoint.serialize()[..],
2393                                 hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
2394
2395                 chan.their_revocation_basepoint = PublicKey::from_slice(&secp_ctx, &hex_bytes("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap();
2396
2397                 // We can't just use build_local_transaction_keys here as the per_commitment_secret is not
2398                 // derived from a commitment_seed, so instead we copy it here and call
2399                 // build_commitment_transaction.
2400                 let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.delayed_payment_base_key).unwrap();
2401                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex_bytes("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
2402                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret).unwrap();
2403                 let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.htlc_base_key).unwrap();
2404                 let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &chan.their_revocation_basepoint, &chan.their_payment_basepoint, &chan.their_htlc_basepoint).unwrap();
2405
2406                 let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
2407
2408                 macro_rules! test_commitment {
2409                         ( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
2410                                 unsigned_tx = chan.build_commitment_transaction(42, &keys, true, false);
2411                                 let their_signature = Signature::from_der(&secp_ctx, &hex_bytes($their_sig_hex).unwrap()[..]).unwrap();
2412                                 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();
2413                                 secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey).unwrap();
2414
2415                                 chan.sign_commitment_transaction(&mut unsigned_tx.0, &their_signature);
2416
2417                                 assert_eq!(serialize(&unsigned_tx.0).unwrap()[..],
2418                                                 hex_bytes($tx_hex).unwrap()[..]);
2419                         };
2420                 }
2421
2422                 macro_rules! test_htlc_output {
2423                         ( $htlc_idx: expr, $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr ) => {
2424                                 let remote_signature = Signature::from_der(&secp_ctx, &hex_bytes($their_sig_hex).unwrap()[..]).unwrap();
2425
2426                                 let ref htlc = unsigned_tx.1[$htlc_idx];
2427                                 let mut htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys);
2428                                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
2429                                 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
2430                                 secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
2431
2432                                 let mut preimage: Option<[u8; 32]> = None;
2433                                 if !htlc.offered {
2434                                         for i in 0..5 {
2435                                                 let mut sha = Sha256::new();
2436                                                 sha.input(&[i; 32]);
2437
2438                                                 let mut out = [0; 32];
2439                                                 sha.result(&mut out);
2440
2441                                                 if out == htlc.payment_hash {
2442                                                         preimage = Some([i; 32]);
2443                                                 }
2444                                         }
2445
2446                                         assert!(preimage.is_some());
2447                                 }
2448
2449                                 chan.sign_htlc_transaction(&mut htlc_tx, &remote_signature, &preimage, &htlc, &keys).unwrap();
2450                                 assert_eq!(serialize(&htlc_tx).unwrap()[..],
2451                                                 hex_bytes($tx_hex).unwrap()[..]);
2452                         };
2453                 }
2454
2455                 {
2456                         // simple commitment tx with no HTLCs
2457                         chan.value_to_self_msat = 7000000000;
2458
2459                         test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
2460                                          "3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
2461                                          "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");
2462                 }
2463
2464                 chan.pending_htlcs.push({
2465                         let mut out = HTLCOutput{
2466                                 htlc_id: 0,
2467                                 outbound: false,
2468                                 amount_msat: 1000000,
2469                                 cltv_expiry: 500,
2470                                 payment_hash: [0; 32],
2471                                 state: HTLCState::Committed,
2472                                 fail_reason: None,
2473                                 local_removed_fulfilled: false,
2474                                 pending_forward_state: None,
2475                         };
2476                         let mut sha = Sha256::new();
2477                         sha.input(&hex_bytes("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
2478                         sha.result(&mut out.payment_hash);
2479                         out
2480                 });
2481                 chan.pending_htlcs.push({
2482                         let mut out = HTLCOutput{
2483                                 htlc_id: 1,
2484                                 outbound: false,
2485                                 amount_msat: 2000000,
2486                                 cltv_expiry: 501,
2487                                 payment_hash: [0; 32],
2488                                 state: HTLCState::Committed,
2489                                 fail_reason: None,
2490                                 local_removed_fulfilled: false,
2491                                 pending_forward_state: None,
2492                         };
2493                         let mut sha = Sha256::new();
2494                         sha.input(&hex_bytes("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
2495                         sha.result(&mut out.payment_hash);
2496                         out
2497                 });
2498                 chan.pending_htlcs.push({
2499                         let mut out = HTLCOutput{
2500                                 htlc_id: 2,
2501                                 outbound: true,
2502                                 amount_msat: 2000000,
2503                                 cltv_expiry: 502,
2504                                 payment_hash: [0; 32],
2505                                 state: HTLCState::Committed,
2506                                 fail_reason: None,
2507                                 local_removed_fulfilled: false,
2508                                 pending_forward_state: None,
2509                         };
2510                         let mut sha = Sha256::new();
2511                         sha.input(&hex_bytes("0202020202020202020202020202020202020202020202020202020202020202").unwrap());
2512                         sha.result(&mut out.payment_hash);
2513                         out
2514                 });
2515                 chan.pending_htlcs.push({
2516                         let mut out = HTLCOutput{
2517                                 htlc_id: 3,
2518                                 outbound: true,
2519                                 amount_msat: 3000000,
2520                                 cltv_expiry: 503,
2521                                 payment_hash: [0; 32],
2522                                 state: HTLCState::Committed,
2523                                 fail_reason: None,
2524                                 local_removed_fulfilled: false,
2525                                 pending_forward_state: None,
2526                         };
2527                         let mut sha = Sha256::new();
2528                         sha.input(&hex_bytes("0303030303030303030303030303030303030303030303030303030303030303").unwrap());
2529                         sha.result(&mut out.payment_hash);
2530                         out
2531                 });
2532                 chan.pending_htlcs.push({
2533                         let mut out = HTLCOutput{
2534                                 htlc_id: 4,
2535                                 outbound: false,
2536                                 amount_msat: 4000000,
2537                                 cltv_expiry: 504,
2538                                 payment_hash: [0; 32],
2539                                 state: HTLCState::Committed,
2540                                 fail_reason: None,
2541                                 local_removed_fulfilled: false,
2542                                 pending_forward_state: None,
2543                         };
2544                         let mut sha = Sha256::new();
2545                         sha.input(&hex_bytes("0404040404040404040404040404040404040404040404040404040404040404").unwrap());
2546                         sha.result(&mut out.payment_hash);
2547                         out
2548                 });
2549
2550                 {
2551                         // commitment tx with all five HTLCs untrimmed (minimum feerate)
2552                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2553                         chan.feerate_per_kw = 0;
2554
2555                         test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
2556                                          "30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
2557                                          "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");
2558
2559                         assert_eq!(unsigned_tx.1.len(), 5);
2560
2561                         test_htlc_output!(0,
2562                                           "304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
2563                                           "304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
2564                                           "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");
2565
2566                         test_htlc_output!(1,
2567                                           "3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
2568                                           "3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
2569                                           "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");
2570
2571                         test_htlc_output!(2,
2572                                           "304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
2573                                           "3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
2574                                           "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");
2575
2576                         test_htlc_output!(3,
2577                                           "3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
2578                                           "30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
2579                                           "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");
2580
2581                         test_htlc_output!(4,
2582                                           "304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
2583                                           "30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
2584                                           "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");
2585                 }
2586
2587                 {
2588                         // commitment tx with seven outputs untrimmed (maximum feerate)
2589                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2590                         chan.feerate_per_kw = 647;
2591
2592                         test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
2593                                          "304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
2594                                          "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");
2595
2596                         assert_eq!(unsigned_tx.1.len(), 5);
2597
2598                         test_htlc_output!(0,
2599                                           "30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
2600                                           "304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
2601                                           "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");
2602
2603                         test_htlc_output!(1,
2604                                           "304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
2605                                           "304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
2606                                           "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");
2607
2608                         test_htlc_output!(2,
2609                                           "304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
2610                                           "3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
2611                                           "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");
2612
2613                         test_htlc_output!(3,
2614                                           "30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
2615                                           "3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
2616                                           "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");
2617
2618                         test_htlc_output!(4,
2619                                           "3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
2620                                           "304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
2621                                           "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");
2622                 }
2623
2624                 {
2625                         // commitment tx with six outputs untrimmed (minimum feerate)
2626                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2627                         chan.feerate_per_kw = 648;
2628
2629                         test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
2630                                          "3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
2631                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8006d007000000000000220020403d394747cae42e98ff01734ad5c08f82ba123d3d9a620abda88989651e2ab5d007000000000000220020748eba944fedc8827f6b06bc44678f93c0f9e6078b35c6331ed31e75f8ce0c2db80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de8431104e9d6a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0400483045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de01473044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b05701475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
2632
2633                         assert_eq!(unsigned_tx.1.len(), 4);
2634
2635                         test_htlc_output!(0,
2636                                           "3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
2637                                           "3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
2638                                           "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");
2639
2640                         test_htlc_output!(1,
2641                                           "3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
2642                                           "304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
2643                                           "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");
2644
2645                         test_htlc_output!(2,
2646                                           "3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
2647                                           "304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
2648                                           "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");
2649
2650                         test_htlc_output!(3,
2651                                           "3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
2652                                           "304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
2653                                           "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");
2654                 }
2655
2656                 {
2657                         // commitment tx with six outputs untrimmed (maximum feerate)
2658                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2659                         chan.feerate_per_kw = 2069;
2660
2661                         test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
2662                                          "304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
2663                                          "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");
2664
2665                         assert_eq!(unsigned_tx.1.len(), 4);
2666
2667                         test_htlc_output!(0,
2668                                           "3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
2669                                           "3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
2670                                           "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");
2671
2672                         test_htlc_output!(1,
2673                                           "3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
2674                                           "3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
2675                                           "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");
2676
2677                         test_htlc_output!(2,
2678                                           "3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
2679                                           "304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
2680                                           "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");
2681
2682                         test_htlc_output!(3,
2683                                           "30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
2684                                           "304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
2685                                           "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");
2686                 }
2687
2688                 {
2689                         // commitment tx with five outputs untrimmed (minimum feerate)
2690                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2691                         chan.feerate_per_kw = 2070;
2692
2693                         test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
2694                                          "30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
2695                                          "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");
2696
2697                         assert_eq!(unsigned_tx.1.len(), 3);
2698
2699                         test_htlc_output!(0,
2700                                           "3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
2701                                           "3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
2702                                           "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");
2703
2704                         test_htlc_output!(1,
2705                                           "3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
2706                                           "3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
2707                                           "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");
2708
2709                         test_htlc_output!(2,
2710                                           "3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
2711                                           "304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
2712                                           "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");
2713                 }
2714
2715                 {
2716                         // commitment tx with five outputs untrimmed (maximum feerate)
2717                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2718                         chan.feerate_per_kw = 2194;
2719
2720                         test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
2721                                          "304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
2722                                          "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");
2723
2724                         assert_eq!(unsigned_tx.1.len(), 3);
2725
2726                         test_htlc_output!(0,
2727                                           "30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
2728                                           "3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
2729                                           "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");
2730
2731                         test_htlc_output!(1,
2732                                           "30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
2733                                           "304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
2734                                           "02000000000101fb824d4e4dafc0f567789dee3a6bce8d411fe80f5563d8cdfdcc7d7e4447d43a010000000000000000010a060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e05004730440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d0147304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c91501008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000");
2735
2736                         test_htlc_output!(2,
2737                                           "3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
2738                                           "3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
2739                                           "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");
2740                 }
2741
2742                 {
2743                         // commitment tx with four outputs untrimmed (minimum feerate)
2744                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2745                         chan.feerate_per_kw = 2195;
2746
2747                         test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
2748                                          "304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
2749                                          "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");
2750
2751                         assert_eq!(unsigned_tx.1.len(), 2);
2752
2753                         test_htlc_output!(0,
2754                                           "3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
2755                                           "3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
2756                                           "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");
2757
2758                         test_htlc_output!(1,
2759                                           "3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
2760                                           "30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
2761                                           "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");
2762                 }
2763
2764                 {
2765                         // commitment tx with four outputs untrimmed (maximum feerate)
2766                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2767                         chan.feerate_per_kw = 3702;
2768
2769                         test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
2770                                          "304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
2771                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8004b80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de8431106f916a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e040047304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b001483045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c101475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
2772
2773                         assert_eq!(unsigned_tx.1.len(), 2);
2774
2775                         test_htlc_output!(0,
2776                                           "3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
2777                                           "304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
2778                                           "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");
2779
2780                         test_htlc_output!(1,
2781                                           "3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
2782                                           "30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
2783                                           "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");
2784                 }
2785
2786                 {
2787                         // commitment tx with three outputs untrimmed (minimum feerate)
2788                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2789                         chan.feerate_per_kw = 3703;
2790
2791                         test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
2792                                          "3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
2793                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8003a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de843110eb936a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0400473044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506014830450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb001475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
2794
2795                         assert_eq!(unsigned_tx.1.len(), 1);
2796
2797                         test_htlc_output!(0,
2798                                           "3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
2799                                           "3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
2800                                           "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");
2801                 }
2802
2803                 {
2804                         // commitment tx with three outputs untrimmed (maximum feerate)
2805                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2806                         chan.feerate_per_kw = 4914;
2807
2808                         test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
2809                                          "304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
2810                                          "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");
2811
2812                         assert_eq!(unsigned_tx.1.len(), 1);
2813
2814                         test_htlc_output!(0,
2815                                           "3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
2816                                           "304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
2817                                           "0200000000010110a3fdcbcd5db477cd3ad465e7f501ffa8c437e8301f00a6061138590add757f0000000000000000000122020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf0148304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
2818                 }
2819
2820                 {
2821                         // commitment tx with two outputs untrimmed (minimum feerate)
2822                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2823                         chan.feerate_per_kw = 4915;
2824
2825                         test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
2826                                          "3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
2827                                          "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");
2828
2829                         assert_eq!(unsigned_tx.1.len(), 0);
2830                 }
2831
2832                 {
2833                         // commitment tx with two outputs untrimmed (maximum feerate)
2834                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2835                         chan.feerate_per_kw = 9651180;
2836
2837                         test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
2838                                          "30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
2839                                          "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");
2840
2841                         assert_eq!(unsigned_tx.1.len(), 0);
2842                 }
2843
2844                 {
2845                         // commitment tx with one output untrimmed (minimum feerate)
2846                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2847                         chan.feerate_per_kw = 9651181;
2848
2849                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
2850                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
2851                                          "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");
2852
2853                         assert_eq!(unsigned_tx.1.len(), 0);
2854                 }
2855
2856                 {
2857                         // commitment tx with fee greater than funder amount
2858                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2859                         chan.feerate_per_kw = 9651936;
2860
2861                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
2862                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
2863                                          "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");
2864
2865                         assert_eq!(unsigned_tx.1.len(), 0);
2866                 }
2867         }
2868
2869         #[test]
2870         fn test_per_commitment_secret_gen() {
2871                 // Test vectors from BOLT 3 Appendix D:
2872
2873                 let mut seed = [0; 32];
2874                 seed[0..32].clone_from_slice(&hex_bytes("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
2875                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
2876                            hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
2877
2878                 seed[0..32].clone_from_slice(&hex_bytes("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
2879                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
2880                            hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
2881
2882                 assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
2883                            hex_bytes("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
2884
2885                 assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
2886                            hex_bytes("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
2887
2888                 seed[0..32].clone_from_slice(&hex_bytes("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
2889                 assert_eq!(chan_utils::build_commitment_secret(seed, 1),
2890                            hex_bytes("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
2891         }
2892
2893         #[test]
2894         fn test_key_derivation() {
2895                 // Test vectors from BOLT 3 Appendix E:
2896                 let secp_ctx = Secp256k1::new();
2897
2898                 let base_secret = SecretKey::from_slice(&secp_ctx, &hex_bytes("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
2899                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex_bytes("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
2900
2901                 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret).unwrap();
2902                 assert_eq!(base_point.serialize()[..], hex_bytes("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
2903
2904                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret).unwrap();
2905                 assert_eq!(per_commitment_point.serialize()[..], hex_bytes("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
2906
2907                 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
2908                                 hex_bytes("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
2909
2910                 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
2911                                 SecretKey::from_slice(&secp_ctx, &hex_bytes("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
2912
2913                 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
2914                                 hex_bytes("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
2915
2916                 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
2917                                 SecretKey::from_slice(&secp_ctx, &hex_bytes("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());
2918         }
2919 }