Remove fuzz channel_target.
[rust-lightning] / src / ln / channel.rs
1 use bitcoin::blockdata::block::BlockHeader;
2 use bitcoin::blockdata::script::{Script,Builder};
3 use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
4 use bitcoin::blockdata::opcodes;
5 use bitcoin::util::hash::{Sha256dHash, Hash160};
6 use bitcoin::util::bip143;
7 use bitcoin::network::serialize::BitcoinHash;
8
9 use secp256k1::key::{PublicKey,SecretKey};
10 use secp256k1::{Secp256k1,Message,Signature};
11 use secp256k1;
12
13 use crypto::digest::Digest;
14 use crypto::hkdf::{hkdf_extract,hkdf_expand};
15
16 use ln::msgs;
17 use ln::msgs::{ErrorAction, HandleError};
18 use ln::channelmonitor::ChannelMonitor;
19 use ln::channelmanager::{PendingHTLCStatus, HTLCSource, PendingForwardHTLCInfo, HTLCFailReason, HTLCFailureMsg};
20 use ln::chan_utils::{TxCreationKeys,HTLCOutputInCommitment,HTLC_SUCCESS_TX_WEIGHT,HTLC_TIMEOUT_TX_WEIGHT};
21 use ln::chan_utils;
22 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
23 use chain::transaction::OutPoint;
24 use util::{transaction_utils,rng};
25 use util::ser::Writeable;
26 use util::sha2::Sha256;
27 use util::logger::Logger;
28 use util::errors::APIError;
29
30 use std;
31 use std::default::Default;
32 use std::{cmp,mem};
33 use std::time::Instant;
34 use std::sync::{Arc};
35
36 pub struct ChannelKeys {
37         pub funding_key: SecretKey,
38         pub revocation_base_key: SecretKey,
39         pub payment_base_key: SecretKey,
40         pub delayed_payment_base_key: SecretKey,
41         pub htlc_base_key: SecretKey,
42         pub channel_close_key: SecretKey,
43         pub channel_monitor_claim_key: SecretKey,
44         pub commitment_seed: [u8; 32],
45 }
46
47 impl ChannelKeys {
48         pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
49                 let mut prk = [0; 32];
50                 hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
51                 let secp_ctx = Secp256k1::without_caps();
52
53                 let mut okm = [0; 32];
54                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
55                 let funding_key = SecretKey::from_slice(&secp_ctx, &okm)?;
56
57                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning revocation base key info", &mut okm);
58                 let revocation_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
59
60                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning payment base key info", &mut okm);
61                 let payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
62
63                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning delayed payment base key info", &mut okm);
64                 let delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
65
66                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
67                 let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
68
69                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
70                 let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm)?;
71
72                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
73                 let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm)?;
74
75                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
76
77                 Ok(ChannelKeys {
78                         funding_key: funding_key,
79                         revocation_base_key: revocation_base_key,
80                         payment_base_key: payment_base_key,
81                         delayed_payment_base_key: delayed_payment_base_key,
82                         htlc_base_key: htlc_base_key,
83                         channel_close_key: channel_close_key,
84                         channel_monitor_claim_key: channel_monitor_claim_key,
85                         commitment_seed: okm
86                 })
87         }
88 }
89
90 #[derive(PartialEq)]
91 enum InboundHTLCState {
92         /// Added by remote, to be included in next local commitment tx.
93         RemoteAnnounced,
94         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
95         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
96         /// accept this HTLC. Implies AwaitingRemoteRevoke.
97         /// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
98         /// a remote revoke_and_ack on a previous state before we can do so.
99         AwaitingRemoteRevokeToAnnounce,
100         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
101         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
102         /// accept this HTLC. Implies AwaitingRemoteRevoke.
103         /// We have included this HTLC in our latest commitment_signed and are now just waiting on a
104         /// revoke_and_ack.
105         AwaitingAnnouncedRemoteRevoke,
106         Committed,
107         /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
108         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
109         /// we'll drop it.
110         /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
111         /// commitment transaction without it as otherwise we'll have to force-close the channel to
112         /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
113         /// anyway). That said, ChannelMonitor does this for us (see
114         /// ChannelMonitor::would_broadcast_at_height) so we actually remove the HTLC from our own
115         /// local state before then, once we're sure that the next commitment_signed and
116         /// ChannelMonitor::provide_latest_local_commitment_tx_info will not include this HTLC.
117         LocalRemoved,
118 }
119
120 struct InboundHTLCOutput {
121         htlc_id: u64,
122         amount_msat: u64,
123         cltv_expiry: u32,
124         payment_hash: [u8; 32],
125         state: InboundHTLCState,
126         /// If we're in LocalRemoved, set to true if we fulfilled the HTLC, and can claim money
127         local_removed_fulfilled: bool,
128         /// state pre-Committed implies pending_forward_state, otherwise it must be None
129         pending_forward_state: Option<PendingHTLCStatus>,
130 }
131
132 #[derive(PartialEq)]
133 enum OutboundHTLCState {
134         /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
135         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
136         /// we will promote to Committed (note that they may not accept it until the next time we
137         /// revoke, but we dont really care about that:
138         ///  * they've revoked, so worst case we can announce an old state and get our (option on)
139         ///    money back (though we wont), and,
140         ///  * we'll send them a revoke when they send a commitment_signed, and since only they're
141         ///    allowed to remove it, the "can only be removed once committed on both sides" requirement
142         ///    doesn't matter to us and its up to them to enforce it, worst-case they jump ahead but
143         ///    we'll never get out of sync).
144         LocalAnnounced,
145         Committed,
146         /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
147         /// the change (though they'll need to revoke before we fail the payment).
148         RemoteRemoved,
149         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
150         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
151         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
152         /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
153         /// remote revoke_and_ack on a previous state before we can do so.
154         AwaitingRemoteRevokeToRemove,
155         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
156         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
157         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
158         /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
159         /// revoke_and_ack to drop completely.
160         AwaitingRemovedRemoteRevoke,
161 }
162
163 struct OutboundHTLCOutput {
164         htlc_id: u64,
165         amount_msat: u64,
166         cltv_expiry: u32,
167         payment_hash: [u8; 32],
168         state: OutboundHTLCState,
169         source: HTLCSource,
170         /// If we're in a removed state, set if they failed, otherwise None
171         fail_reason: Option<HTLCFailReason>,
172 }
173
174 macro_rules! get_htlc_in_commitment {
175         ($htlc: expr, $offered: expr) => {
176                 HTLCOutputInCommitment {
177                         offered: $offered,
178                         amount_msat: $htlc.amount_msat,
179                         cltv_expiry: $htlc.cltv_expiry,
180                         payment_hash: $htlc.payment_hash,
181                         transaction_output_index: 0
182                 }
183         }
184 }
185
186 /// See AwaitingRemoteRevoke ChannelState for more info
187 enum HTLCUpdateAwaitingACK {
188         AddHTLC {
189                 // always outbound
190                 amount_msat: u64,
191                 cltv_expiry: u32,
192                 payment_hash: [u8; 32],
193                 source: HTLCSource,
194                 onion_routing_packet: msgs::OnionPacket,
195                 time_created: Instant, //TODO: Some kind of timeout thing-a-majig
196         },
197         ClaimHTLC {
198                 payment_preimage: [u8; 32],
199                 htlc_id: u64,
200         },
201         FailHTLC {
202                 htlc_id: u64,
203                 err_packet: msgs::OnionErrorPacket,
204         },
205 }
206
207 /// There are a few "states" and then a number of flags which can be applied:
208 /// We first move through init with OurInitSent -> TheirInitSent -> FundingCreated -> FundingSent.
209 /// TheirFundingLocked and OurFundingLocked then get set on FundingSent, and when both are set we
210 /// move on to ChannelFunded.
211 /// Note that PeerDisconnected can be set on both ChannelFunded and FundingSent.
212 /// ChannelFunded can then get all remaining flags set on it, until we finish shutdown, then we
213 /// move on to ShutdownComplete, at which point most calls into this channel are disallowed.
214 enum ChannelState {
215         /// Implies we have (or are prepared to) send our open_channel/accept_channel message
216         OurInitSent = (1 << 0),
217         /// Implies we have received their open_channel/accept_channel message
218         TheirInitSent = (1 << 1),
219         /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
220         /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
221         /// upon receipt of funding_created, so simply skip this state.
222         FundingCreated = 4,
223         /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
224         /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
225         /// and our counterparty consider the funding transaction confirmed.
226         FundingSent = 8,
227         /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
228         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
229         TheirFundingLocked = (1 << 4),
230         /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
231         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
232         OurFundingLocked = (1 << 5),
233         ChannelFunded = 64,
234         /// Flag which is set on ChannelFunded and FundingSent indicating remote side is considered
235         /// "disconnected" and no updates are allowed until after we've done a channel_reestablish
236         /// dance.
237         PeerDisconnected = (1 << 7),
238         /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
239         /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
240         /// messages as then we will be unable to determine which HTLCs they included in their
241         /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
242         /// later.
243         /// Flag is set on ChannelFunded.
244         AwaitingRemoteRevoke = (1 << 8),
245         /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
246         /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
247         /// to respond with our own shutdown message when possible.
248         RemoteShutdownSent = (1 << 9),
249         /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
250         /// point, we may not add any new HTLCs to the channel.
251         /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
252         /// us their shutdown.
253         LocalShutdownSent = (1 << 10),
254         /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
255         /// to drop us, but we store this anyway.
256         ShutdownComplete = 2048,
257 }
258 const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
259
260 const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
261
262 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
263 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
264 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
265 // inbound channel.
266 pub(super) struct Channel {
267         user_id: u64,
268
269         channel_id: [u8; 32],
270         channel_state: u32,
271         channel_outbound: bool,
272         secp_ctx: Secp256k1<secp256k1::All>,
273         announce_publicly: bool,
274         channel_value_satoshis: u64,
275
276         local_keys: ChannelKeys,
277
278         // Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
279         // generation start at 0 and count up...this simplifies some parts of implementation at the
280         // cost of others, but should really just be changed.
281
282         cur_local_commitment_transaction_number: u64,
283         cur_remote_commitment_transaction_number: u64,
284         value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
285         pending_inbound_htlcs: Vec<InboundHTLCOutput>,
286         pending_outbound_htlcs: Vec<OutboundHTLCOutput>,
287         holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
288         next_local_htlc_id: u64,
289         next_remote_htlc_id: u64,
290         channel_update_count: u32,
291         feerate_per_kw: u64,
292
293         #[cfg(test)]
294         // Used in ChannelManager's tests to send a revoked transaction
295         pub last_local_commitment_txn: Vec<Transaction>,
296         #[cfg(not(test))]
297         last_local_commitment_txn: Vec<Transaction>,
298
299         last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
300
301         /// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
302         /// to detect unconfirmation after a serialize-unserialize roudtrip where we may not see a full
303         /// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
304         /// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
305         funding_tx_confirmed_in: Option<Sha256dHash>,
306         short_channel_id: Option<u64>,
307         /// Used to deduplicate block_connected callbacks
308         last_block_connected: Sha256dHash,
309         funding_tx_confirmations: u64,
310
311         their_dust_limit_satoshis: u64,
312         our_dust_limit_satoshis: u64,
313         their_max_htlc_value_in_flight_msat: u64,
314         //get_our_max_htlc_value_in_flight_msat(): u64,
315         their_channel_reserve_satoshis: u64,
316         //get_our_channel_reserve_satoshis(): u64,
317         their_htlc_minimum_msat: u64,
318         our_htlc_minimum_msat: u64,
319         their_to_self_delay: u16,
320         //implied by BREAKDOWN_TIMEOUT: our_to_self_delay: u16,
321         their_max_accepted_htlcs: u16,
322         //implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
323
324         their_funding_pubkey: Option<PublicKey>,
325         their_revocation_basepoint: Option<PublicKey>,
326         their_payment_basepoint: Option<PublicKey>,
327         their_delayed_payment_basepoint: Option<PublicKey>,
328         their_htlc_basepoint: Option<PublicKey>,
329         their_cur_commitment_point: Option<PublicKey>,
330
331         their_prev_commitment_point: Option<PublicKey>,
332         their_node_id: PublicKey,
333
334         their_shutdown_scriptpubkey: Option<Script>,
335
336         channel_monitor: ChannelMonitor,
337
338         logger: Arc<Logger>,
339 }
340
341 const OUR_MAX_HTLCS: u16 = 5; //TODO
342 /// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
343 /// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
344 /// really allow for this, so instead we're stuck closing it out at that point.
345 const UNCONF_THRESHOLD: u32 = 6;
346 /// The amount of time we require our counterparty wait to claim their money (ie time between when
347 /// we, or our watchtower, must check for them having broadcast a theft transaction).
348 const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
349 /// The amount of time we're willing to wait to claim money back to us
350 const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
351 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
352 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
353 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
354 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?)
355 /// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
356 /// it's 2^24.
357 pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
358
359 macro_rules! secp_call {
360         ( $res: expr, $err: expr, $chan_id: expr ) => {
361                 match $res {
362                         Ok(key) => key,
363                         Err(_) => return Err(HandleError {err: $err, action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: $chan_id, data: $err.to_string()}})})
364                 }
365         };
366 }
367
368 macro_rules! secp_derived_key {
369         ( $res: expr, $chan_id: expr ) => {
370                 secp_call!($res, "Derived invalid key, peer is maliciously selecting parameters", $chan_id)
371         }
372 }
373 impl Channel {
374         // Convert constants + channel value to limits:
375         fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
376                 channel_value_satoshis * 1000 / 10 //TODO
377         }
378
379         /// Guaranteed to return a value no larger than channel_value_satoshis
380         fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
381                 let (q, _) = channel_value_satoshis.overflowing_div(100);
382                 cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
383         }
384
385         fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
386                 at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT / 1000 //TODO
387         }
388
389         fn derive_our_htlc_minimum_msat(_at_open_channel_feerate_per_kw: u64) -> u64 {
390                 1000 // TODO
391         }
392
393         fn derive_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
394                 // Note that in order to comply with BOLT 7 announcement_signatures requirements this must
395                 // be at least 6.
396                 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
397                 CONF_TARGET
398         }
399
400         fn derive_maximum_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
401                 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
402                 CONF_TARGET * 2
403         }
404
405         // Constructors:
406         pub fn new_outbound(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, announce_publicly: bool, user_id: u64, logger: Arc<Logger>) -> Result<Channel, APIError> {
407                 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
408                         return Err(APIError::APIMisuseError{err: "funding value > 2^24"});
409                 }
410
411                 if push_msat > channel_value_satoshis * 1000 {
412                         return Err(APIError::APIMisuseError{err: "push value > channel value"});
413                 }
414
415
416                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
417                 if Channel::get_our_channel_reserve_satoshis(channel_value_satoshis) < Channel::derive_our_dust_limit_satoshis(background_feerate) {
418                         return Err(APIError::FeeRateTooHigh{err: format!("Not enough reserve above dust limit can be found at current fee rate({})", background_feerate), feerate: background_feerate});
419                 }
420
421                 let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
422
423                 let secp_ctx = Secp256k1::new();
424                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).serialize());
425                 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();
426                 let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
427                                                           &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key),
428                                                           &chan_keys.htlc_base_key,
429                                                           BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
430
431                 Ok(Channel {
432                         user_id: user_id,
433
434                         channel_id: rng::rand_u832(),
435                         channel_state: ChannelState::OurInitSent as u32,
436                         channel_outbound: true,
437                         secp_ctx: secp_ctx,
438                         announce_publicly: announce_publicly,
439                         channel_value_satoshis: channel_value_satoshis,
440
441                         local_keys: chan_keys,
442                         cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
443                         cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
444                         value_to_self_msat: channel_value_satoshis * 1000 - push_msat,
445                         pending_inbound_htlcs: Vec::new(),
446                         pending_outbound_htlcs: Vec::new(),
447                         holding_cell_htlc_updates: Vec::new(),
448                         next_local_htlc_id: 0,
449                         next_remote_htlc_id: 0,
450                         channel_update_count: 1,
451
452                         last_local_commitment_txn: Vec::new(),
453
454                         last_sent_closing_fee: None,
455
456                         funding_tx_confirmed_in: None,
457                         short_channel_id: None,
458                         last_block_connected: Default::default(),
459                         funding_tx_confirmations: 0,
460
461                         feerate_per_kw: feerate,
462                         their_dust_limit_satoshis: 0,
463                         our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
464                         their_max_htlc_value_in_flight_msat: 0,
465                         their_channel_reserve_satoshis: 0,
466                         their_htlc_minimum_msat: 0,
467                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(feerate),
468                         their_to_self_delay: 0,
469                         their_max_accepted_htlcs: 0,
470
471                         their_funding_pubkey: None,
472                         their_revocation_basepoint: None,
473                         their_payment_basepoint: None,
474                         their_delayed_payment_basepoint: None,
475                         their_htlc_basepoint: None,
476                         their_cur_commitment_point: None,
477
478                         their_prev_commitment_point: None,
479                         their_node_id: their_node_id,
480
481                         their_shutdown_scriptpubkey: None,
482
483                         channel_monitor: channel_monitor,
484
485                         logger,
486                 })
487         }
488
489         fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), HandleError> {
490                 if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) {
491                         return Err(HandleError{err: "Peer's feerate much too low", action: Some(msgs::ErrorAction::DisconnectPeer{ msg: None })});
492                 }
493                 if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) * 2 {
494                         return Err(HandleError{err: "Peer's feerate much too high", action: Some(msgs::ErrorAction::DisconnectPeer{ msg: None })});
495                 }
496                 Ok(())
497         }
498
499         /// Creates a new channel from a remote sides' request for one.
500         /// Assumes chain_hash has already been checked and corresponds with what we expect!
501         /// Generally prefers to take the DisconnectPeer action on failure, as a notice to the sender
502         /// that we're rejecting the new channel.
503         pub fn new_from_req(fee_estimator: &FeeEstimator, chan_keys: ChannelKeys, their_node_id: PublicKey, msg: &msgs::OpenChannel, user_id: u64, require_announce: bool, allow_announce: bool, logger: Arc<Logger>) -> Result<Channel, HandleError> {
504                 macro_rules! return_error_message {
505                         ( $msg: expr ) => {
506                                 return Err(HandleError{err: $msg, action: Some(msgs::ErrorAction::SendErrorMessage{ msg: msgs::ErrorMessage { channel_id: msg.temporary_channel_id, data: $msg.to_string() }})});
507                         }
508                 }
509
510                 // Check sanity of message fields:
511                 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
512                         return_error_message!("funding value > 2^24");
513                 }
514                 if msg.channel_reserve_satoshis > msg.funding_satoshis {
515                         return_error_message!("Bogus channel_reserve_satoshis");
516                 }
517                 if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
518                         return_error_message!("push_msat larger than funding value");
519                 }
520                 if msg.dust_limit_satoshis > msg.funding_satoshis {
521                         return_error_message!("Peer never wants payout outputs?");
522                 }
523                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
524                         return_error_message!("Bogus; channel reserve is less than dust limit");
525                 }
526                 if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
527                         return_error_message!("Miminum htlc value is full channel value");
528                 }
529                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw).map_err(|e|
530                         HandleError{err: e.err, action: Some(msgs::ErrorAction::SendErrorMessage{ msg: msgs::ErrorMessage { channel_id: msg.temporary_channel_id, data: e.err.to_string() }})}
531                 )?;
532
533                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
534                         return_error_message!("They wanted our payments to be delayed by a needlessly long period");
535                 }
536                 if msg.max_accepted_htlcs < 1 {
537                         return_error_message!("0 max_accpted_htlcs makes for a useless channel");
538                 }
539                 if msg.max_accepted_htlcs > 483 {
540                         return_error_message!("max_accpted_htlcs > 483");
541                 }
542
543                 // Convert things into internal flags and prep our state:
544
545                 let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
546                 if require_announce && !their_announce {
547                         return_error_message!("Peer tried to open unannounced channel, but we require public ones");
548                 }
549                 if !allow_announce && their_announce {
550                         return_error_message!("Peer tried to open announced channel, but we require private ones");
551                 }
552
553                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
554
555                 let our_dust_limit_satoshis = Channel::derive_our_dust_limit_satoshis(background_feerate);
556                 let our_channel_reserve_satoshis = Channel::get_our_channel_reserve_satoshis(msg.funding_satoshis);
557                 if our_channel_reserve_satoshis < our_dust_limit_satoshis {
558                         return_error_message!("Suitalbe channel reserve not found. aborting");
559                 }
560                 if msg.channel_reserve_satoshis < our_dust_limit_satoshis {
561                         return_error_message!("channel_reserve_satoshis too small");
562                 }
563                 if our_channel_reserve_satoshis < msg.dust_limit_satoshis {
564                         return_error_message!("Dust limit too high for our channel reserve");
565                 }
566
567                 // check if the funder's amount for the initial commitment tx is sufficient
568                 // for full fee payment
569                 let funders_amount_msat = msg.funding_satoshis * 1000 - msg.push_msat;
570                 if funders_amount_msat < background_feerate * COMMITMENT_TX_BASE_WEIGHT {
571                         return_error_message!("Insufficient funding amount for initial commitment");
572                 }
573
574                 let to_local_msat = msg.push_msat;
575                 let to_remote_msat = funders_amount_msat - background_feerate * COMMITMENT_TX_BASE_WEIGHT;
576                 if to_local_msat <= msg.channel_reserve_satoshis * 1000 && to_remote_msat <= our_channel_reserve_satoshis * 1000 {
577                         return_error_message!("Insufficient funding amount for initial commitment");
578                 }
579
580                 let secp_ctx = Secp256k1::new();
581                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).serialize());
582                 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();
583                 let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
584                                                               &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key),
585                                                               &chan_keys.htlc_base_key,
586                                                               BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
587                 channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
588                 channel_monitor.set_their_to_self_delay(msg.to_self_delay);
589
590                 let mut chan = Channel {
591                         user_id: user_id,
592
593                         channel_id: msg.temporary_channel_id,
594                         channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
595                         channel_outbound: false,
596                         secp_ctx: secp_ctx,
597                         announce_publicly: their_announce,
598
599                         local_keys: chan_keys,
600                         cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
601                         cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
602                         value_to_self_msat: msg.push_msat,
603                         pending_inbound_htlcs: Vec::new(),
604                         pending_outbound_htlcs: Vec::new(),
605                         holding_cell_htlc_updates: Vec::new(),
606                         next_local_htlc_id: 0,
607                         next_remote_htlc_id: 0,
608                         channel_update_count: 1,
609
610                         last_local_commitment_txn: Vec::new(),
611
612                         last_sent_closing_fee: None,
613
614                         funding_tx_confirmed_in: None,
615                         short_channel_id: None,
616                         last_block_connected: Default::default(),
617                         funding_tx_confirmations: 0,
618
619                         feerate_per_kw: msg.feerate_per_kw as u64,
620                         channel_value_satoshis: msg.funding_satoshis,
621                         their_dust_limit_satoshis: msg.dust_limit_satoshis,
622                         our_dust_limit_satoshis: our_dust_limit_satoshis,
623                         their_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
624                         their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
625                         their_htlc_minimum_msat: msg.htlc_minimum_msat,
626                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
627                         their_to_self_delay: msg.to_self_delay,
628                         their_max_accepted_htlcs: msg.max_accepted_htlcs,
629
630                         their_funding_pubkey: Some(msg.funding_pubkey),
631                         their_revocation_basepoint: Some(msg.revocation_basepoint),
632                         their_payment_basepoint: Some(msg.payment_basepoint),
633                         their_delayed_payment_basepoint: Some(msg.delayed_payment_basepoint),
634                         their_htlc_basepoint: Some(msg.htlc_basepoint),
635                         their_cur_commitment_point: Some(msg.first_per_commitment_point),
636
637                         their_prev_commitment_point: None,
638                         their_node_id: their_node_id,
639
640                         their_shutdown_scriptpubkey: None,
641
642                         channel_monitor: channel_monitor,
643
644                         logger,
645                 };
646
647                 let obscure_factor = chan.get_commitment_transaction_number_obscure_factor();
648                 chan.channel_monitor.set_commitment_obscure_factor(obscure_factor);
649
650                 Ok(chan)
651         }
652
653         // Utilities to derive keys:
654
655         fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
656                 let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, idx);
657                 SecretKey::from_slice(&self.secp_ctx, &res).unwrap()
658         }
659
660         // Utilities to build transactions:
661
662         fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
663                 let mut sha = Sha256::new();
664                 let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
665
666                 if self.channel_outbound {
667                         sha.input(&our_payment_basepoint.serialize());
668                         sha.input(&self.their_payment_basepoint.unwrap().serialize());
669                 } else {
670                         sha.input(&self.their_payment_basepoint.unwrap().serialize());
671                         sha.input(&our_payment_basepoint.serialize());
672                 }
673                 let mut res = [0; 32];
674                 sha.result(&mut res);
675
676                 ((res[26] as u64) << 5*8) |
677                 ((res[27] as u64) << 4*8) |
678                 ((res[28] as u64) << 3*8) |
679                 ((res[29] as u64) << 2*8) |
680                 ((res[30] as u64) << 1*8) |
681                 ((res[31] as u64) << 0*8)
682         }
683
684         /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
685         /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
686         /// the transaction. Thus, b will generally be sending a signature over such a transaction to
687         /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
688         /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
689         /// an HTLC to a).
690         /// @local is used only to convert relevant internal structures which refer to remote vs local
691         /// to decide value of outputs and direction of HTLCs.
692         /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
693         /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
694         /// have not yet committed it. Such HTLCs will only be included in transactions which are being
695         /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
696         /// which peer generated this transaction and "to whom" this transaction flows.
697         #[inline]
698         fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool) -> (Transaction, Vec<HTLCOutputInCommitment>) {
699                 let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ (INITIAL_COMMITMENT_NUMBER - commitment_number);
700
701                 let txins = {
702                         let mut ins: Vec<TxIn> = Vec::new();
703                         ins.push(TxIn {
704                                 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
705                                 script_sig: Script::new(),
706                                 sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
707                                 witness: Vec::new(),
708                         });
709                         ins
710                 };
711
712                 let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::with_capacity(self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len() + 2);
713
714                 let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
715                 let mut remote_htlc_total_msat = 0;
716                 let mut local_htlc_total_msat = 0;
717                 let mut value_to_self_msat_offset = 0;
718
719                 macro_rules! add_htlc_output {
720                         ($htlc: expr, $outbound: expr) => {
721                                 if $outbound == local { // "offered HTLC output"
722                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
723                                                 let htlc_in_tx = get_htlc_in_commitment!($htlc, true);
724                                                 txouts.push((TxOut {
725                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
726                                                         value: $htlc.amount_msat / 1000
727                                                 }, Some(htlc_in_tx)));
728                                         }
729                                 } else {
730                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
731                                                 let htlc_in_tx = get_htlc_in_commitment!($htlc, false);
732                                                 txouts.push((TxOut { // "received HTLC output"
733                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
734                                                         value: $htlc.amount_msat / 1000
735                                                 }, Some(htlc_in_tx)));
736                                         }
737                                 }
738                         }
739                 }
740
741                 for ref htlc in self.pending_inbound_htlcs.iter() {
742                         let include = match htlc.state {
743                                 InboundHTLCState::RemoteAnnounced => !generated_by_local,
744                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce => !generated_by_local,
745                                 InboundHTLCState::AwaitingAnnouncedRemoteRevoke => true,
746                                 InboundHTLCState::Committed => true,
747                                 InboundHTLCState::LocalRemoved => !generated_by_local,
748                         };
749
750                         if include {
751                                 add_htlc_output!(htlc, false);
752                                 remote_htlc_total_msat += htlc.amount_msat;
753                         } else {
754                                 match htlc.state {
755                                         InboundHTLCState::LocalRemoved => {
756                                                 if generated_by_local && htlc.local_removed_fulfilled {
757                                                         value_to_self_msat_offset += htlc.amount_msat as i64;
758                                                 }
759                                         },
760                                         _ => {},
761                                 }
762                         }
763                 }
764
765                 for ref htlc in self.pending_outbound_htlcs.iter() {
766                         let include = match htlc.state {
767                                 OutboundHTLCState::LocalAnnounced => generated_by_local,
768                                 OutboundHTLCState::Committed => true,
769                                 OutboundHTLCState::RemoteRemoved => generated_by_local,
770                                 OutboundHTLCState::AwaitingRemoteRevokeToRemove => generated_by_local,
771                                 OutboundHTLCState::AwaitingRemovedRemoteRevoke => false,
772                         };
773
774                         if include {
775                                 add_htlc_output!(htlc, true);
776                                 local_htlc_total_msat += htlc.amount_msat;
777                         } else {
778                                 match htlc.state {
779                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove|OutboundHTLCState::AwaitingRemovedRemoteRevoke => {
780                                                 if htlc.fail_reason.is_none() {
781                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
782                                                 }
783                                         },
784                                         OutboundHTLCState::RemoteRemoved => {
785                                                 if !generated_by_local && htlc.fail_reason.is_none() {
786                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
787                                                 }
788                                         },
789                                         _ => {},
790                                 }
791                         }
792                 }
793
794                 let total_fee: u64 = self.feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
795                 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 };
796                 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 };
797
798                 let value_to_a = if local { value_to_self } else { value_to_remote };
799                 let value_to_b = if local { value_to_remote } else { value_to_self };
800
801                 if value_to_a >= (dust_limit_satoshis as i64) {
802                         txouts.push((TxOut {
803                                 script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
804                                                                                        if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
805                                                                                        &keys.a_delayed_payment_key).to_v0_p2wsh(),
806                                 value: value_to_a as u64
807                         }, None));
808                 }
809
810                 if value_to_b >= (dust_limit_satoshis as i64) {
811                         txouts.push((TxOut {
812                                 script_pubkey: Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
813                                                              .push_slice(&Hash160::from_data(&keys.b_payment_key.serialize())[..])
814                                                              .into_script(),
815                                 value: value_to_b as u64
816                         }, None));
817                 }
818
819                 transaction_utils::sort_outputs(&mut txouts);
820
821                 let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
822                 let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::with_capacity(txouts.len());
823                 for (idx, out) in txouts.drain(..).enumerate() {
824                         outputs.push(out.0);
825                         if let Some(out_htlc) = out.1 {
826                                 htlcs_used.push(out_htlc);
827                                 htlcs_used.last_mut().unwrap().transaction_output_index = idx as u32;
828                         }
829                 }
830
831                 (Transaction {
832                         version: 2,
833                         lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
834                         input: txins,
835                         output: outputs,
836                 }, htlcs_used)
837         }
838
839         #[inline]
840         fn get_closing_scriptpubkey(&self) -> Script {
841                 let our_channel_close_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.channel_close_key).serialize());
842                 Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
843         }
844
845         #[inline]
846         fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
847                 (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)
848         }
849
850         #[inline]
851         fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
852                 let txins = {
853                         let mut ins: Vec<TxIn> = Vec::new();
854                         ins.push(TxIn {
855                                 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
856                                 script_sig: Script::new(),
857                                 sequence: 0xffffffff,
858                                 witness: Vec::new(),
859                         });
860                         ins
861                 };
862
863                 assert!(self.pending_inbound_htlcs.is_empty());
864                 assert!(self.pending_outbound_htlcs.is_empty());
865                 let mut txouts: Vec<(TxOut, ())> = Vec::new();
866
867                 let mut total_fee_satoshis = proposed_total_fee_satoshis;
868                 let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
869                 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 };
870
871                 if value_to_self < 0 {
872                         assert!(self.channel_outbound);
873                         total_fee_satoshis += (-value_to_self) as u64;
874                 } else if value_to_remote < 0 {
875                         assert!(!self.channel_outbound);
876                         total_fee_satoshis += (-value_to_remote) as u64;
877                 }
878
879                 if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
880                         txouts.push((TxOut {
881                                 script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
882                                 value: value_to_remote as u64
883                         }, ()));
884                 }
885
886                 if value_to_self as u64 > self.our_dust_limit_satoshis {
887                         txouts.push((TxOut {
888                                 script_pubkey: self.get_closing_scriptpubkey(),
889                                 value: value_to_self as u64
890                         }, ()));
891                 }
892
893                 transaction_utils::sort_outputs(&mut txouts);
894
895                 let mut outputs: Vec<TxOut> = Vec::new();
896                 for out in txouts.drain(..) {
897                         outputs.push(out.0);
898                 }
899
900                 (Transaction {
901                         version: 2,
902                         lock_time: 0,
903                         input: txins,
904                         output: outputs,
905                 }, total_fee_satoshis)
906         }
907
908         #[inline]
909         /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
910         /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
911         /// our counterparty!)
912         /// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
913         /// TODO Some magic rust shit to compile-time check this?
914         fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, HandleError> {
915                 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number));
916                 let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key);
917                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
918
919                 Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &self.their_revocation_basepoint.unwrap(), &self.their_payment_basepoint.unwrap(), &self.their_htlc_basepoint.unwrap()), self.channel_id()))
920         }
921
922         #[inline]
923         /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
924         /// will sign and send to our counterparty.
925         fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, HandleError> {
926                 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
927                 //may see payments to it!
928                 let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
929                 let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key);
930                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
931
932                 Ok(secp_derived_key!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point.unwrap(), &self.their_delayed_payment_basepoint.unwrap(), &self.their_htlc_basepoint.unwrap(), &revocation_basepoint, &payment_basepoint, &htlc_basepoint), self.channel_id()))
933         }
934
935         /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
936         /// pays to get_funding_redeemscript().to_v0_p2wsh()).
937         /// Panics if called before accept_channel/new_from_req
938         pub fn get_funding_redeemscript(&self) -> Script {
939                 let builder = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2);
940                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
941                 let their_funding_key = self.their_funding_pubkey.expect("get_funding_redeemscript only allowed after accept_channel").serialize();
942                 if our_funding_key[..] < their_funding_key[..] {
943                         builder.push_slice(&our_funding_key)
944                                 .push_slice(&their_funding_key)
945                 } else {
946                         builder.push_slice(&their_funding_key)
947                                 .push_slice(&our_funding_key)
948                 }.push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script()
949         }
950
951         fn sign_commitment_transaction(&self, tx: &mut Transaction, their_sig: &Signature) -> Signature {
952                 if tx.input.len() != 1 {
953                         panic!("Tried to sign commitment transaction that had input count != 1!");
954                 }
955                 if tx.input[0].witness.len() != 0 {
956                         panic!("Tried to re-sign commitment transaction");
957                 }
958
959                 let funding_redeemscript = self.get_funding_redeemscript();
960
961                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
962                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
963
964                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
965
966                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
967                 let their_funding_key = self.their_funding_pubkey.unwrap().serialize();
968                 if our_funding_key[..] < their_funding_key[..] {
969                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
970                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
971                 } else {
972                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
973                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
974                 }
975                 tx.input[0].witness[1].push(SigHashType::All as u8);
976                 tx.input[0].witness[2].push(SigHashType::All as u8);
977
978                 tx.input[0].witness.push(funding_redeemscript.into_bytes());
979
980                 our_sig
981         }
982
983         /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
984         /// @local is used only to convert relevant internal structures which refer to remote vs local
985         /// to decide value of outputs and direction of HTLCs.
986         fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys) -> Transaction {
987                 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)
988         }
989
990         fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), HandleError> {
991                 if tx.input.len() != 1 {
992                         panic!("Tried to sign HTLC transaction that had input count != 1!");
993                 }
994
995                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
996
997                 let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &keys.per_commitment_point, &self.local_keys.htlc_base_key), self.channel_id());
998                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
999                 let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key) == keys.a_htlc_key;
1000                 Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key), is_local_tx))
1001         }
1002
1003         /// Signs a transaction created by build_htlc_transaction. If the transaction is an
1004         /// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
1005         fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, HandleError> {
1006                 if tx.input.len() != 1 {
1007                         panic!("Tried to sign HTLC transaction that had input count != 1!");
1008                 }
1009                 if tx.input[0].witness.len() != 0 {
1010                         panic!("Tried to re-sign HTLC transaction");
1011                 }
1012
1013                 let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
1014
1015                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1016
1017                 if local_tx { // b, then a
1018                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1019                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1020                 } else {
1021                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1022                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1023                 }
1024                 tx.input[0].witness[1].push(SigHashType::All as u8);
1025                 tx.input[0].witness[2].push(SigHashType::All as u8);
1026
1027                 if htlc.offered {
1028                         tx.input[0].witness.push(Vec::new());
1029                 } else {
1030                         tx.input[0].witness.push(preimage.unwrap().to_vec());
1031                 }
1032
1033                 tx.input[0].witness.push(htlc_redeemscript.into_bytes());
1034
1035                 Ok(our_sig)
1036         }
1037
1038         /// May return an IgnoreError, but should not, and will always return Ok(_) when
1039         /// debug_assertions are turned on
1040         fn get_update_fulfill_htlc(&mut self, htlc_id_arg: u64, payment_preimage_arg: [u8; 32]) -> Result<(Option<msgs::UpdateFulfillHTLC>, Option<ChannelMonitor>), HandleError> {
1041                 // Either ChannelFunded got set (which means it wont bet unset) or there is no way any
1042                 // caller thought we could have something claimed (cause we wouldn't have accepted in an
1043                 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
1044                 // either.
1045                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1046                         panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
1047                 }
1048                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1049
1050                 let mut sha = Sha256::new();
1051                 sha.input(&payment_preimage_arg);
1052                 let mut payment_hash_calc = [0; 32];
1053                 sha.result(&mut payment_hash_calc);
1054
1055                 let mut pending_idx = std::usize::MAX;
1056                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1057                         if htlc.htlc_id == htlc_id_arg {
1058                                 assert_eq!(htlc.payment_hash, payment_hash_calc);
1059                                 if htlc.state != InboundHTLCState::Committed {
1060                                         debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1061                                         // Don't return in release mode here so that we can update channel_monitor
1062                                 }
1063                                 pending_idx = idx;
1064                                 break;
1065                         }
1066                 }
1067                 if pending_idx == std::usize::MAX {
1068                         debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1069                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1070                 }
1071
1072                 // Now update local state:
1073                 //
1074                 // We have to put the payment_preimage in the channel_monitor right away here to ensure we
1075                 // can claim it even if the channel hits the chain before we see their next commitment.
1076                 self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
1077
1078                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32)) != 0 {
1079                         for pending_update in self.holding_cell_htlc_updates.iter() {
1080                                 match pending_update {
1081                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1082                                                 if htlc_id_arg == htlc_id {
1083                                                         debug_assert!(false, "Tried to fulfill an HTLC we already had a pending fulfill for");
1084                                                         return Ok((None, None));
1085                                                 }
1086                                         },
1087                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1088                                                 if htlc_id_arg == htlc_id {
1089                                                         debug_assert!(false, "Tried to fulfill an HTLC we already had a holding-cell failure on");
1090                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1091                                                 }
1092                                         },
1093                                         _ => {}
1094                                 }
1095                         }
1096                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
1097                                 payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
1098                         });
1099                         return Ok((None, Some(self.channel_monitor.clone())));
1100                 }
1101
1102                 {
1103                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1104                         if htlc.state != InboundHTLCState::Committed {
1105                                 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1106                                 return Ok((None, Some(self.channel_monitor.clone())));
1107                         }
1108                         htlc.state = InboundHTLCState::LocalRemoved;
1109                         htlc.local_removed_fulfilled = true;
1110                 }
1111
1112                 Ok((Some(msgs::UpdateFulfillHTLC {
1113                         channel_id: self.channel_id(),
1114                         htlc_id: htlc_id_arg,
1115                         payment_preimage: payment_preimage_arg,
1116                 }), Some(self.channel_monitor.clone())))
1117         }
1118
1119         pub fn get_update_fulfill_htlc_and_commit(&mut self, htlc_id: u64, payment_preimage: [u8; 32]) -> Result<(Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>, Option<ChannelMonitor>), HandleError> {
1120                 match self.get_update_fulfill_htlc(htlc_id, payment_preimage)? {
1121                         (Some(update_fulfill_htlc), _) => {
1122                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1123                                 Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
1124                         },
1125                         (None, Some(channel_monitor)) => Ok((None, Some(channel_monitor))),
1126                         (None, None) => Ok((None, None))
1127                 }
1128         }
1129
1130         /// May return an IgnoreError, but should not, and will always return Ok(_) when
1131         /// debug_assertions are turned on
1132         pub fn get_update_fail_htlc(&mut self, htlc_id_arg: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, HandleError> {
1133                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1134                         panic!("Was asked to fail an HTLC when channel was not in an operational state");
1135                 }
1136                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1137
1138                 let mut pending_idx = std::usize::MAX;
1139                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1140                         if htlc.htlc_id == htlc_id_arg {
1141                                 if htlc.state != InboundHTLCState::Committed {
1142                                         debug_assert!(false, "Have an inbound HTLC we tried to fail before it was fully committed to");
1143                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1144                                 }
1145                                 pending_idx = idx;
1146                         }
1147                 }
1148                 if pending_idx == std::usize::MAX {
1149                         debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1150                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1151                 }
1152
1153                 // Now update local state:
1154                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32)) != 0 {
1155                         for pending_update in self.holding_cell_htlc_updates.iter() {
1156                                 match pending_update {
1157                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1158                                                 if htlc_id_arg == htlc_id {
1159                                                         debug_assert!(false, "Unable to find a pending HTLC which matched the given HTLC ID");
1160                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: Some(msgs::ErrorAction::IgnoreError)});
1161                                                 }
1162                                         },
1163                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1164                                                 if htlc_id_arg == htlc_id {
1165                                                         debug_assert!(false, "Tried to fail an HTLC that we already had a pending failure for");
1166                                                         return Ok(None);
1167                                                 }
1168                                         },
1169                                         _ => {}
1170                                 }
1171                         }
1172                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1173                                 htlc_id: htlc_id_arg,
1174                                 err_packet,
1175                         });
1176                         return Ok(None);
1177                 }
1178
1179                 {
1180                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1181                         htlc.state = InboundHTLCState::LocalRemoved;
1182                         htlc.local_removed_fulfilled = false;
1183                 }
1184
1185                 Ok(Some(msgs::UpdateFailHTLC {
1186                         channel_id: self.channel_id(),
1187                         htlc_id: htlc_id_arg,
1188                         reason: err_packet
1189                 }))
1190         }
1191
1192         pub fn get_update_fail_htlc_and_commit(&mut self, htlc_id: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
1193                 match self.get_update_fail_htlc(htlc_id, err_packet)? {
1194                         Some(update_fail_htlc) => {
1195                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1196                                 Ok(Some((update_fail_htlc, commitment, monitor_update)))
1197                         },
1198                         None => Ok(None)
1199                 }
1200         }
1201
1202         // Message handlers:
1203
1204         pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1205                 macro_rules! return_error_message {
1206                         ( $msg: expr ) => {
1207                                 return Err(HandleError{err: $msg, action: Some(msgs::ErrorAction::SendErrorMessage{ msg: msgs::ErrorMessage { channel_id: msg.temporary_channel_id, data: $msg.to_string() }})});
1208                         }
1209                 }
1210                 // Check sanity of message fields:
1211                 if !self.channel_outbound {
1212                         return_error_message!("Got an accept_channel message from an inbound peer");
1213                 }
1214                 if self.channel_state != ChannelState::OurInitSent as u32 {
1215                         return_error_message!("Got an accept_channel message at a strange time");
1216                 }
1217                 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1218                         return_error_message!("Peer never wants payout outputs?");
1219                 }
1220                 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1221                         return_error_message!("Bogus channel_reserve_satoshis");
1222                 }
1223                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
1224                         return_error_message!("Bogus channel_reserve and dust_limit");
1225                 }
1226                 if msg.channel_reserve_satoshis < self.our_dust_limit_satoshis {
1227                         return_error_message!("Peer never wants payout outputs?");
1228                 }
1229                 if msg.dust_limit_satoshis > Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis) {
1230                         return_error_message!("Dust limit is bigger than our channel reverse");
1231                 }
1232                 if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
1233                         return_error_message!("Minimum htlc value is full channel value");
1234                 }
1235                 if msg.minimum_depth > Channel::derive_maximum_minimum_depth(self.channel_value_satoshis*1000,  self.value_to_self_msat) {
1236                         return_error_message!("minimum_depth too large");
1237                 }
1238                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
1239                         return_error_message!("They wanted our payments to be delayed by a needlessly long period");
1240                 }
1241                 if msg.max_accepted_htlcs < 1 {
1242                         return_error_message!("0 max_accpted_htlcs makes for a useless channel");
1243                 }
1244                 if msg.max_accepted_htlcs > 483 {
1245                         return_error_message!("max_accpted_htlcs > 483");
1246                 }
1247
1248                 // TODO: Optional additional constraints mentioned in the spec
1249                 // MAY fail the channel if
1250                 // funding_satoshi is too small
1251                 // htlc_minimum_msat too large
1252                 // max_htlc_value_in_flight_msat too small
1253                 // channel_reserve_satoshis too large
1254                 // max_accepted_htlcs too small
1255                 // dust_limit_satoshis too small
1256
1257                 self.channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
1258
1259                 self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
1260                 self.their_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
1261                 self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
1262                 self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
1263                 self.their_to_self_delay = msg.to_self_delay;
1264                 self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
1265                 self.their_funding_pubkey = Some(msg.funding_pubkey);
1266                 self.their_revocation_basepoint = Some(msg.revocation_basepoint);
1267                 self.their_payment_basepoint = Some(msg.payment_basepoint);
1268                 self.their_delayed_payment_basepoint = Some(msg.delayed_payment_basepoint);
1269                 self.their_htlc_basepoint = Some(msg.htlc_basepoint);
1270                 self.their_cur_commitment_point = Some(msg.first_per_commitment_point);
1271
1272                 let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
1273                 self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
1274                 self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
1275
1276                 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1277
1278                 Ok(())
1279         }
1280
1281         fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, Signature), HandleError> {
1282                 let funding_script = self.get_funding_redeemscript();
1283
1284                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1285                 let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
1286                 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();
1287
1288                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1289                 secp_call!(self.secp_ctx.verify(&local_sighash, &sig, &self.their_funding_pubkey.unwrap()), "Invalid funding_created signature from peer", self.channel_id());
1290
1291                 let remote_keys = self.build_remote_transaction_keys()?;
1292                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
1293                 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();
1294
1295                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
1296                 Ok((remote_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key)))
1297         }
1298
1299         pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), HandleError> {
1300                 if self.channel_outbound {
1301                         return Err(HandleError{err: "Received funding_created for an outbound channel?", action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: self.channel_id, data: "Received funding_created for an outbound channel?".to_string()}})});
1302                 }
1303                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1304                         // BOLT 2 says that if we disconnect before we send funding_signed we SHOULD NOT
1305                         // remember the channel, so its safe to just send an error_message here and drop the
1306                         // channel.
1307                         return Err(HandleError{err: "Received funding_created after we got the channel!", action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: self.channel_id, data: "Received funding_created after we got the channel!".to_string()}})});
1308                 }
1309                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
1310                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
1311                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1312                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1313                 }
1314
1315                 let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
1316                 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
1317                 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
1318
1319                 let (remote_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
1320                         Ok(res) => res,
1321                         Err(e) => {
1322                                 self.channel_monitor.unset_funding_info();
1323                                 return Err(e);
1324                         }
1325                 };
1326
1327                 // Now that we're past error-generating stuff, update our local state:
1328
1329                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
1330                 self.channel_state = ChannelState::FundingSent as u32;
1331                 self.channel_id = funding_txo.to_channel_id();
1332                 self.cur_remote_commitment_transaction_number -= 1;
1333                 self.cur_local_commitment_transaction_number -= 1;
1334
1335                 Ok((msgs::FundingSigned {
1336                         channel_id: self.channel_id,
1337                         signature: our_signature
1338                 }, self.channel_monitor.clone()))
1339         }
1340
1341         /// Handles a funding_signed message from the remote end.
1342         /// If this call is successful, broadcast the funding transaction (and not before!)
1343         pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, HandleError> {
1344                 if !self.channel_outbound {
1345                         return Err(HandleError{err: "Received funding_signed for an inbound channel?", action: None});
1346                 }
1347                 if self.channel_state != ChannelState::FundingCreated as u32 {
1348                         return Err(HandleError{err: "Received funding_signed in strange state!", action: None});
1349                 }
1350                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
1351                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER - 1 ||
1352                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1353                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1354                 }
1355
1356                 let funding_script = self.get_funding_redeemscript();
1357
1358                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1359                 let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
1360                 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();
1361
1362                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1363                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid funding_signed signature from peer", self.channel_id());
1364
1365                 self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
1366                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
1367                 self.last_local_commitment_txn = vec![local_initial_commitment_tx];
1368                 self.channel_state = ChannelState::FundingSent as u32;
1369                 self.cur_local_commitment_transaction_number -= 1;
1370
1371                 Ok(self.channel_monitor.clone())
1372         }
1373
1374         pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), HandleError> {
1375                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1376                         return Err(HandleError{err: "Peer sent funding_locked when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent funding_locked when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1377                 }
1378                 let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
1379                 if non_shutdown_state == ChannelState::FundingSent as u32 {
1380                         self.channel_state |= ChannelState::TheirFundingLocked as u32;
1381                 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1382                         self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
1383                         self.channel_update_count += 1;
1384                 } else if self.channel_state & (ChannelState::ChannelFunded as u32) != 0 &&
1385                                 // Note that funding_signed/funding_created will have decremented both by 1!
1386                                 self.cur_local_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 &&
1387                                 self.cur_remote_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 {
1388                         if self.their_cur_commitment_point != Some(msg.next_per_commitment_point) {
1389                                 return Err(HandleError{err: "Peer sent a reconnect funding_locked with a different point", action: None});
1390                         }
1391                         // They probably disconnected/reconnected and re-sent the funding_locked, which is required
1392                         return Ok(());
1393                 } else {
1394                         return Err(HandleError{err: "Peer sent a funding_locked at a strange time", action: None});
1395                 }
1396
1397                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1398                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1399                 Ok(())
1400         }
1401
1402         /// Returns (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
1403         /// If its for a remote update check, we need to be more lax about checking against messages we
1404         /// sent but they may not have received/processed before they sent this message. Further, for
1405         /// our own sends, we're more conservative and even consider things they've removed against
1406         /// totals, though there is little reason to outside of further avoiding any race condition
1407         /// issues.
1408         fn get_pending_htlc_stats(&self, for_remote_update_check: bool) -> (u32, u32, u64, u64) {
1409                 //TODO: Can probably split this into inbound/outbound
1410                 let mut inbound_htlc_count: u32 = 0;
1411                 let mut outbound_htlc_count: u32 = 0;
1412                 let mut htlc_outbound_value_msat = 0;
1413                 let mut htlc_inbound_value_msat = 0;
1414                 for ref htlc in self.pending_inbound_htlcs.iter() {
1415                         match htlc.state {
1416                                 InboundHTLCState::RemoteAnnounced => {},
1417                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce => {},
1418                                 InboundHTLCState::AwaitingAnnouncedRemoteRevoke => {},
1419                                 InboundHTLCState::Committed => {},
1420                                 InboundHTLCState::LocalRemoved => {},
1421                         }
1422                         inbound_htlc_count += 1;
1423                         htlc_inbound_value_msat += htlc.amount_msat;
1424                 }
1425                 for ref htlc in self.pending_outbound_htlcs.iter() {
1426                         match htlc.state {
1427                                 OutboundHTLCState::LocalAnnounced => { if for_remote_update_check { continue; } },
1428                                 OutboundHTLCState::Committed => {},
1429                                 OutboundHTLCState::RemoteRemoved => { if for_remote_update_check { continue; } },
1430                                 OutboundHTLCState::AwaitingRemoteRevokeToRemove => { if for_remote_update_check { continue; } },
1431                                 OutboundHTLCState::AwaitingRemovedRemoteRevoke => { if for_remote_update_check { continue; } },
1432                         }
1433                         outbound_htlc_count += 1;
1434                         htlc_outbound_value_msat += htlc.amount_msat;
1435                 }
1436
1437                 (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
1438         }
1439
1440         pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingHTLCStatus) -> Result<(), HandleError> {
1441                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
1442                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1443                 }
1444                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1445                         return Err(HandleError{err: "Peer sent update_add_htlc when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent update_add_htlc when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1446                 }
1447                 if msg.amount_msat > self.channel_value_satoshis * 1000 {
1448                         return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", action: None});
1449                 }
1450                 if msg.amount_msat < self.our_htlc_minimum_msat {
1451                         return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", action: None});
1452                 }
1453
1454                 let (inbound_htlc_count, _, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(true);
1455                 if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
1456                         return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", action: None});
1457                 }
1458                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
1459                 // Check our_max_htlc_value_in_flight_msat
1460                 if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
1461                         return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", action: None});
1462                 }
1463                 // Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
1464                 // the reserve_satoshis we told them to always have as direct payment so that they lose
1465                 // something if we punish them for broadcasting an old state).
1466                 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 {
1467                         return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", action: None});
1468                 }
1469                 if self.next_remote_htlc_id != msg.htlc_id {
1470                         return Err(HandleError{err: "Remote skipped HTLC ID", action: None});
1471                 }
1472                 if msg.cltv_expiry >= 500000000 {
1473                         return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", action: None});
1474                 }
1475
1476                 //TODO: Check msg.cltv_expiry further? Do this in channel manager?
1477
1478                 // Now update local state:
1479                 self.next_remote_htlc_id += 1;
1480                 self.pending_inbound_htlcs.push(InboundHTLCOutput {
1481                         htlc_id: msg.htlc_id,
1482                         amount_msat: msg.amount_msat,
1483                         payment_hash: msg.payment_hash,
1484                         cltv_expiry: msg.cltv_expiry,
1485                         state: InboundHTLCState::RemoteAnnounced,
1486                         local_removed_fulfilled: false,
1487                         pending_forward_state: Some(pending_forward_state),
1488                 });
1489
1490                 Ok(())
1491         }
1492
1493         /// Removes an outbound HTLC which has been commitment_signed by the remote end
1494         #[inline]
1495         fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<&HTLCSource, HandleError> {
1496                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1497                         if htlc.htlc_id == htlc_id {
1498                                 match check_preimage {
1499                                         None => {},
1500                                         Some(payment_hash) =>
1501                                                 if payment_hash != htlc.payment_hash {
1502                                                         return Err(HandleError{err: "Remote tried to fulfill HTLC with an incorrect preimage", action: None});
1503                                                 }
1504                                 };
1505                                 match htlc.state {
1506                                         OutboundHTLCState::LocalAnnounced =>
1507                                                 return Err(HandleError{err: "Remote tried to fulfill HTLC before it had been committed", action: None}),
1508                                         OutboundHTLCState::Committed => {
1509                                                 htlc.state = OutboundHTLCState::RemoteRemoved;
1510                                                 htlc.fail_reason = fail_reason;
1511                                         },
1512                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove | OutboundHTLCState::AwaitingRemovedRemoteRevoke | OutboundHTLCState::RemoteRemoved =>
1513                                                 return Err(HandleError{err: "Remote tried to fulfill HTLC that they'd already fulfilled", action: None}),
1514                                 }
1515                                 return Ok(&htlc.source);
1516                         }
1517                 }
1518                 Err(HandleError{err: "Remote tried to fulfill/fail an HTLC we couldn't find", action: None})
1519         }
1520
1521         pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<&HTLCSource, HandleError> {
1522                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1523                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1524                 }
1525                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1526                         return Err(HandleError{err: "Peer sent update_fulfill_htlc when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent update_fulfill_htlc when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1527                 }
1528
1529                 let mut sha = Sha256::new();
1530                 sha.input(&msg.payment_preimage);
1531                 let mut payment_hash = [0; 32];
1532                 sha.result(&mut payment_hash);
1533
1534                 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)
1535         }
1536
1537         pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<&HTLCSource, HandleError> {
1538                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1539                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1540                 }
1541                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1542                         return Err(HandleError{err: "Peer sent update_fail_htlc when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent update_fail_htlc when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1543                 }
1544
1545                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1546         }
1547
1548         pub fn update_fail_malformed_htlc<'a>(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<&HTLCSource, HandleError> {
1549                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1550                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1551                 }
1552                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1553                         return Err(HandleError{err: "Peer sent update_fail_malformed_htlc when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent update_fail_malformed_htlc when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1554                 }
1555
1556                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1557         }
1558
1559         pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitor), HandleError> {
1560                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1561                         return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", action: None});
1562                 }
1563                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1564                         return Err(HandleError{err: "Peer sent commitment_signed when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent commitment_signed when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1565                 }
1566
1567                 let funding_script = self.get_funding_redeemscript();
1568
1569                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1570                 let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false);
1571                 let local_commitment_txid = local_commitment_tx.0.txid();
1572                 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();
1573                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid commitment tx signature from peer", self.channel_id());
1574
1575                 if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
1576                         return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", action: None});
1577                 }
1578
1579                 let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
1580                 self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
1581                 new_local_commitment_txn.push(local_commitment_tx.0.clone());
1582
1583                 let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
1584                 for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
1585                         let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys);
1586                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
1587                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1588                         secp_call!(self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key), "Invalid HTLC tx siganture from peer", self.channel_id());
1589                         let htlc_sig = if htlc.offered {
1590                                 let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
1591                                 new_local_commitment_txn.push(htlc_tx);
1592                                 htlc_sig
1593                         } else {
1594                                 self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
1595                         };
1596                         htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
1597                 }
1598
1599                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1));
1600                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
1601
1602                 // Update state now that we've passed all the can-fail calls...
1603                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
1604
1605                 let mut need_our_commitment = false;
1606                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1607                         if htlc.state == InboundHTLCState::RemoteAnnounced {
1608                                 htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce;
1609                                 need_our_commitment = true;
1610                         }
1611                 }
1612                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1613                         if htlc.state == OutboundHTLCState::RemoteRemoved {
1614                                 htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove;
1615                                 need_our_commitment = true;
1616                         }
1617                 }
1618
1619                 self.cur_local_commitment_transaction_number -= 1;
1620                 self.last_local_commitment_txn = new_local_commitment_txn;
1621
1622                 let (our_commitment_signed, monitor_update) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1623                         // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
1624                         // we'll send one right away when we get the revoke_and_ack when we
1625                         // free_holding_cell_htlcs().
1626                         let (msg, monitor) = self.send_commitment_no_status_check()?;
1627                         (Some(msg), monitor)
1628                 } else { (None, self.channel_monitor.clone()) };
1629
1630                 Ok((msgs::RevokeAndACK {
1631                         channel_id: self.channel_id,
1632                         per_commitment_secret: per_commitment_secret,
1633                         next_per_commitment_point: next_per_commitment_point,
1634                 }, our_commitment_signed, monitor_update))
1635         }
1636
1637         /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
1638         /// fulfilling or failing the last pending HTLC)
1639         fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, HandleError> {
1640                 if self.holding_cell_htlc_updates.len() != 0 {
1641                         let mut htlc_updates = Vec::new();
1642                         mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
1643                         let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
1644                         let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
1645                         let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
1646                         let mut err = None;
1647                         for htlc_update in htlc_updates.drain(..) {
1648                                 // Note that this *can* fail, though it should be due to rather-rare conditions on
1649                                 // fee races with adding too many outputs which push our total payments just over
1650                                 // the limit. In case its less rare than I anticipate, we may want to revisit
1651                                 // handling this case better and maybe fufilling some of the HTLCs while attempting
1652                                 // to rebalance channels.
1653                                 if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
1654                                         self.holding_cell_htlc_updates.push(htlc_update);
1655                                 } else {
1656                                         match &htlc_update {
1657                                                 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, payment_hash, ref source, ref onion_routing_packet, ..} => {
1658                                                         match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone()) {
1659                                                                 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
1660                                                                 Err(e) => {
1661                                                                         err = Some(e);
1662                                                                 }
1663                                                         }
1664                                                 },
1665                                                 &HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, htlc_id, .. } => {
1666                                                         match self.get_update_fulfill_htlc(htlc_id, payment_preimage) {
1667                                                                 Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.0.unwrap()),
1668                                                                 Err(e) => {
1669                                                                         if let Some(msgs::ErrorAction::IgnoreError) = e.action {}
1670                                                                         else {
1671                                                                                 panic!("Got a non-IgnoreError action trying to fulfill holding cell HTLC");
1672                                                                         }
1673                                                                 }
1674                                                         }
1675                                                 },
1676                                                 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
1677                                                         match self.get_update_fail_htlc(htlc_id, err_packet.clone()) {
1678                                                                 Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
1679                                                                 Err(e) => {
1680                                                                         if let Some(msgs::ErrorAction::IgnoreError) = e.action {}
1681                                                                         else {
1682                                                                                 panic!("Got a non-IgnoreError action trying to fail holding cell HTLC");
1683                                                                         }
1684                                                                 }
1685                                                         }
1686                                                 },
1687                                         }
1688                                         if err.is_some() {
1689                                                 self.holding_cell_htlc_updates.push(htlc_update);
1690                                         }
1691                                 }
1692                         }
1693                         //TODO: Need to examine the type of err - if its a fee issue or similar we may want to
1694                         //fail it back the route, if its a temporary issue we can ignore it...
1695                         match err {
1696                                 None => {
1697                                         if update_add_htlcs.is_empty() && update_fulfill_htlcs.is_empty() && update_fail_htlcs.is_empty() {
1698                                                 // This should never actually happen and indicates we got some Errs back
1699                                                 // from update_fulfill_htlc/update_fail_htlc, but we handle it anyway in
1700                                                 // case there is some strange way to hit duplicate HTLC removes.
1701                                                 return Ok(None);
1702                                         }
1703                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1704                                         Ok(Some((msgs::CommitmentUpdate {
1705                                                 update_add_htlcs,
1706                                                 update_fulfill_htlcs,
1707                                                 update_fail_htlcs,
1708                                                 update_fail_malformed_htlcs: Vec::new(),
1709                                                 commitment_signed,
1710                                         }, monitor_update)))
1711                                 },
1712                                 Some(e) => Err(e)
1713                         }
1714                 } else {
1715                         Ok(None)
1716                 }
1717         }
1718
1719         /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
1720         /// commitment_signed message here in case we had pending outbound HTLCs to add which were
1721         /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
1722         /// generating an appropriate error *after* the channel state has been updated based on the
1723         /// revoke_and_ack message.
1724         pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingForwardHTLCInfo, u64)>, Vec<(HTLCSource, [u8; 32], HTLCFailReason)>, ChannelMonitor), HandleError> {
1725                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1726                         return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", action: None});
1727                 }
1728                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1729                         return Err(HandleError{err: "Peer sent revoke_and_ack when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent revoke_and_ack when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1730                 }
1731                 if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
1732                         if PublicKey::from_secret_key(&self.secp_ctx, &secp_call!(SecretKey::from_slice(&self.secp_ctx, &msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret", self.channel_id())) != their_prev_commitment_point {
1733                                 return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", action: None});
1734                         }
1735                 }
1736                 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)))?;
1737
1738                 // Update state now that we've passed all the can-fail calls...
1739                 // (note that we may still fail to generate the new commitment_signed message, but that's
1740                 // OK, we step the channel here and *then* if the new generation fails we can fail the
1741                 // channel based on that, but stepping stuff here should be safe either way.
1742                 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
1743                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1744                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1745                 self.cur_remote_commitment_transaction_number -= 1;
1746
1747                 let mut to_forward_infos = Vec::new();
1748                 let mut revoked_htlcs = Vec::new();
1749                 let mut update_fail_htlcs = Vec::new();
1750                 let mut update_fail_malformed_htlcs = Vec::new();
1751                 let mut require_commitment = false;
1752                 let mut value_to_self_msat_diff: i64 = 0;
1753                 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
1754                 self.pending_inbound_htlcs.retain(|htlc| {
1755                         if htlc.state == InboundHTLCState::LocalRemoved {
1756                                 if htlc.local_removed_fulfilled {
1757                                         value_to_self_msat_diff += htlc.amount_msat as i64;
1758                                 }
1759                                 false
1760                         } else { true }
1761                 });
1762                 self.pending_outbound_htlcs.retain(|htlc| {
1763                         if htlc.state == OutboundHTLCState::AwaitingRemovedRemoteRevoke {
1764                                 if let Some(reason) = htlc.fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
1765                                         revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
1766                                 } else {
1767                                         // They fulfilled, so we sent them money
1768                                         value_to_self_msat_diff -= htlc.amount_msat as i64;
1769                                 }
1770                                 false
1771                         } else { true }
1772                 });
1773                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1774                         if htlc.state == InboundHTLCState::AwaitingRemoteRevokeToAnnounce {
1775                                 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke;
1776                                 require_commitment = true;
1777                         } else if htlc.state == InboundHTLCState::AwaitingAnnouncedRemoteRevoke {
1778                                 match htlc.pending_forward_state.take().unwrap() {
1779                                         PendingHTLCStatus::Fail(fail_msg) => {
1780                                                 htlc.state = InboundHTLCState::LocalRemoved;
1781                                                 require_commitment = true;
1782                                                 match fail_msg {
1783                                                         HTLCFailureMsg::Relay(msg) => update_fail_htlcs.push(msg),
1784                                                         HTLCFailureMsg::Malformed(msg) => update_fail_malformed_htlcs.push(msg),
1785                                                 }
1786                                         },
1787                                         PendingHTLCStatus::Forward(forward_info) => {
1788                                                 to_forward_infos.push((forward_info, htlc.htlc_id));
1789                                                 htlc.state = InboundHTLCState::Committed;
1790                                         }
1791                                 }
1792                         }
1793                 }
1794                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1795                         if htlc.state == OutboundHTLCState::LocalAnnounced {
1796                                 htlc.state = OutboundHTLCState::Committed;
1797                         } else if htlc.state == OutboundHTLCState::AwaitingRemoteRevokeToRemove {
1798                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
1799                                 require_commitment = true;
1800                         }
1801                 }
1802                 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
1803
1804                 match self.free_holding_cell_htlcs()? {
1805                         Some(mut commitment_update) => {
1806                                 commitment_update.0.update_fail_htlcs.reserve(update_fail_htlcs.len());
1807                                 for fail_msg in update_fail_htlcs.drain(..) {
1808                                         commitment_update.0.update_fail_htlcs.push(fail_msg);
1809                                 }
1810                                 commitment_update.0.update_fail_malformed_htlcs.reserve(update_fail_malformed_htlcs.len());
1811                                 for fail_msg in update_fail_malformed_htlcs.drain(..) {
1812                                         commitment_update.0.update_fail_malformed_htlcs.push(fail_msg);
1813                                 }
1814                                 Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, commitment_update.1))
1815                         },
1816                         None => {
1817                                 if require_commitment {
1818                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1819                                         Ok((Some(msgs::CommitmentUpdate {
1820                                                 update_add_htlcs: Vec::new(),
1821                                                 update_fulfill_htlcs: Vec::new(),
1822                                                 update_fail_htlcs,
1823                                                 update_fail_malformed_htlcs,
1824                                                 commitment_signed
1825                                         }), to_forward_infos, revoked_htlcs, monitor_update))
1826                                 } else {
1827                                         Ok((None, to_forward_infos, revoked_htlcs, self.channel_monitor.clone()))
1828                                 }
1829                         }
1830                 }
1831         }
1832
1833         /// Removes any uncommitted HTLCs, to be used on peer disconnection, including any pending
1834         /// HTLCs that we intended to add but haven't as we were waiting on a remote revoke.
1835         /// Returns the set of PendingHTLCStatuses from remote uncommitted HTLCs (which we're
1836         /// implicitly dropping) and the payment_hashes of HTLCs we tried to add but are dropping.
1837         /// No further message handling calls may be made until a channel_reestablish dance has
1838         /// completed.
1839         pub fn remove_uncommitted_htlcs_and_mark_paused(&mut self) -> Vec<(HTLCSource, [u8; 32])> {
1840                 let mut outbound_drops = Vec::new();
1841
1842                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1843                 if self.channel_state < ChannelState::FundingSent as u32 {
1844                         self.channel_state = ChannelState::ShutdownComplete as u32;
1845                         return outbound_drops;
1846                 }
1847
1848                 let mut inbound_drop_count = 0;
1849                 self.pending_inbound_htlcs.retain(|htlc| {
1850                         match htlc.state {
1851                                 InboundHTLCState::RemoteAnnounced => {
1852                                         // They sent us an update_add_htlc but we never got the commitment_signed.
1853                                         // We'll tell them what commitment_signed we're expecting next and they'll drop
1854                                         // this HTLC accordingly
1855                                         inbound_drop_count += 1;
1856                                         false
1857                                 },
1858                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce|InboundHTLCState::AwaitingAnnouncedRemoteRevoke => {
1859                                         // Same goes for AwaitingRemoteRevokeToRemove and AwaitingRemovedRemoteRevoke
1860                                         // We received a commitment_signed updating this HTLC and (at least hopefully)
1861                                         // sent a revoke_and_ack (which we can re-transmit) and have heard nothing
1862                                         // in response to it yet, so don't touch it.
1863                                         true
1864                                 },
1865                                 InboundHTLCState::Committed => true,
1866                                 InboundHTLCState::LocalRemoved => { // Same goes for LocalAnnounced
1867                                         // We (hopefully) sent a commitment_signed updating this HTLC (which we can
1868                                         // re-transmit if needed) and they may have even sent a revoke_and_ack back
1869                                         // (that we missed). Keep this around for now and if they tell us they missed
1870                                         // the commitment_signed we can re-transmit the update then.
1871                                         true
1872                                 },
1873                         }
1874                 });
1875
1876                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1877                         if htlc.state == OutboundHTLCState::RemoteRemoved {
1878                                 // They sent us an update to remove this but haven't yet sent the corresponding
1879                                 // commitment_signed, we need to move it back to Committed and they can re-send
1880                                 // the update upon reconnection.
1881                                 htlc.state = OutboundHTLCState::Committed;
1882                         }
1883                 }
1884
1885                 self.holding_cell_htlc_updates.retain(|htlc_update| {
1886                         match htlc_update {
1887                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
1888                                         outbound_drops.push((source.clone(), payment_hash.clone()));
1889                                         false
1890                                 },
1891                                 &HTLCUpdateAwaitingACK::ClaimHTLC {..} | &HTLCUpdateAwaitingACK::FailHTLC {..} => true,
1892                         }
1893                 });
1894                 self.channel_state |= ChannelState::PeerDisconnected as u32;
1895                 log_debug!(self, "Peer disconnection resulted in {} remote-announced HTLC drops and {} waiting-to-locally-announced HTLC drops on channel {}", outbound_drops.len(), inbound_drop_count, log_bytes!(self.channel_id()));
1896                 outbound_drops
1897         }
1898
1899         pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1900                 if self.channel_outbound {
1901                         return Err(HandleError{err: "Non-funding remote tried to update channel fee", action: None});
1902                 }
1903                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1904                         return Err(HandleError{err: "Peer sent update_fee when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent update_fee when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1905                 }
1906                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
1907                 self.channel_update_count += 1;
1908                 self.feerate_per_kw = msg.feerate_per_kw as u64;
1909                 Ok(())
1910         }
1911
1912         /// May panic if some calls other than message-handling calls (which will all Err immediately)
1913         /// have been called between remove_uncommitted_htlcs_and_mark_paused and this call.
1914         pub fn channel_reestablish(&mut self, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, Option<ChannelMonitor>), HandleError> {
1915                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == 0 {
1916                         return Err(HandleError{err: "Peer sent a loose channel_reestablish not after reconnect", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent a loose channel_reestablish not after reconnect".to_string(), channel_id: msg.channel_id}})});
1917                 }
1918
1919                 if msg.next_local_commitment_number == 0 || msg.next_local_commitment_number >= INITIAL_COMMITMENT_NUMBER ||
1920                                 msg.next_remote_commitment_number == 0 || msg.next_remote_commitment_number >= INITIAL_COMMITMENT_NUMBER {
1921                         return Err(HandleError{err: "Peer send garbage channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer send garbage channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1922                 }
1923
1924                 // Go ahead and unmark PeerDisconnected as various calls we may make check for it (and all
1925                 // remaining cases either succeed or ErrorMessage-fail).
1926                 self.channel_state &= !(ChannelState::PeerDisconnected as u32);
1927
1928                 let mut required_revoke = None;
1929                 if msg.next_remote_commitment_number == INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number {
1930                         // Remote isn't waiting on any RevokeAndACK from us!
1931                         // Note that if we need to repeat our FundingLocked we'll do that in the next if block.
1932                 } else if msg.next_remote_commitment_number == (INITIAL_COMMITMENT_NUMBER - 1) - self.cur_local_commitment_transaction_number {
1933                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number));
1934                         let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 2);
1935                         required_revoke = Some(msgs::RevokeAndACK {
1936                                 channel_id: self.channel_id,
1937                                 per_commitment_secret,
1938                                 next_per_commitment_point,
1939                         });
1940                 } else {
1941                         return Err(HandleError{err: "Peer attempted to reestablish channel with a very old local commitment transaction", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer attempted to reestablish channel with a very old remote commitment transaction".to_string(), channel_id: msg.channel_id}})});
1942                 }
1943
1944                 if msg.next_local_commitment_number == INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number {
1945                         if msg.next_remote_commitment_number == INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number {
1946                                 log_debug!(self, "Reconnected channel {} with no lost commitment txn", log_bytes!(self.channel_id()));
1947                                 if msg.next_local_commitment_number == 1 && msg.next_remote_commitment_number == 1 {
1948                                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
1949                                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
1950                                         return Ok((Some(msgs::FundingLocked {
1951                                                 channel_id: self.channel_id(),
1952                                                 next_per_commitment_point: next_per_commitment_point,
1953                                         }), None, None, None));
1954                                 }
1955                         }
1956
1957                         if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1958                                 // We're up-to-date and not waiting on a remote revoke (if we are our
1959                                 // channel_reestablish should result in them sending a revoke_and_ack), but we may
1960                                 // have received some updates while we were disconnected. Free the holding cell
1961                                 // now!
1962                                 match self.free_holding_cell_htlcs() {
1963                                         Err(e) => {
1964                                                 if let &Some(msgs::ErrorAction::DisconnectPeer{msg: Some(_)}) = &e.action {
1965                                                 } else if let &Some(msgs::ErrorAction::SendErrorMessage{msg: _}) = &e.action {
1966                                                 } else {
1967                                                         panic!("Got non-channel-failing result from free_holding_cell_htlcs");
1968                                                 }
1969                                                 return Err(e);
1970                                         },
1971                                         Ok(Some((commitment_update, channel_monitor))) => return Ok((None, required_revoke, Some(commitment_update), Some(channel_monitor))),
1972                                         Ok(None) => return Ok((None, required_revoke, None, None)),
1973                                 }
1974                         } else {
1975                                 return Ok((None, required_revoke, None, None));
1976                         }
1977                 } else if msg.next_local_commitment_number == (INITIAL_COMMITMENT_NUMBER - 1) - self.cur_remote_commitment_transaction_number {
1978                         return Ok((None, required_revoke,
1979                                         Some(msgs::CommitmentUpdate {
1980                                                 update_add_htlcs: Vec::new(),
1981                                                 update_fulfill_htlcs: Vec::new(),
1982                                                 update_fail_htlcs: Vec::new(),
1983                                                 update_fail_malformed_htlcs: Vec::new(),
1984                                                 commitment_signed: self.send_commitment_no_state_update().expect("It looks like we failed to re-generate a commitment_signed we had previously sent?").0,
1985                                         }), None));
1986                 } else {
1987                         return Err(HandleError{err: "Peer attempted to reestablish channel with a very old remote commitment transaction", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer attempted to reestablish channel with a very old remote commitment transaction".to_string(), channel_id: msg.channel_id}})});
1988                 }
1989         }
1990
1991         pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, [u8; 32])>), HandleError> {
1992                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1993                         return Err(HandleError{err: "Peer sent shutdown when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent shutdown when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
1994                 }
1995                 if self.channel_state < ChannelState::FundingSent as u32 {
1996                         self.channel_state = ChannelState::ShutdownComplete as u32;
1997                         self.channel_update_count += 1;
1998                         return Ok((None, None, Vec::new()));
1999                 }
2000                 for htlc in self.pending_inbound_htlcs.iter() {
2001                         if htlc.state == InboundHTLCState::RemoteAnnounced {
2002                                 return Err(HandleError{err: "Got shutdown with remote pending HTLCs", action: None});
2003                         }
2004                 }
2005                 if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
2006                         return Err(HandleError{err: "Remote peer sent duplicate shutdown message", action: None});
2007                 }
2008                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2009
2010                 // BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
2011                 // 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
2012                 if self.channel_outbound && msg.scriptpubkey.len() > 34 {
2013                         return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", action: None});
2014                 }
2015                 //TODO: Check shutdown_scriptpubkey form as BOLT says we must? WHYYY
2016
2017                 if self.their_shutdown_scriptpubkey.is_some() {
2018                         if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
2019                                 return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", action: None});
2020                         }
2021                 } else {
2022                         self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
2023                 }
2024
2025                 let our_closing_script = self.get_closing_scriptpubkey();
2026
2027                 let (proposed_feerate, proposed_fee, our_sig) = if self.channel_outbound && self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() {
2028                         let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2029                         if self.feerate_per_kw > proposed_feerate {
2030                                 proposed_feerate = self.feerate_per_kw;
2031                         }
2032                         let tx_weight = Self::get_closing_transaction_weight(&our_closing_script, &msg.scriptpubkey);
2033                         let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 1000;
2034
2035                         let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
2036                         let funding_redeemscript = self.get_funding_redeemscript();
2037                         let sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2038
2039                         (Some(proposed_feerate), Some(total_fee_satoshis), Some(self.secp_ctx.sign(&sighash, &self.local_keys.funding_key)))
2040                 } else { (None, None, None) };
2041
2042                 // From here on out, we may not fail!
2043
2044                 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
2045                 self.channel_update_count += 1;
2046
2047                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2048                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2049                 // cell HTLCs and return them to fail the payment.
2050                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2051                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2052                         match htlc_update {
2053                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2054                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
2055                                         false
2056                                 },
2057                                 _ => true
2058                         }
2059                 });
2060                 for htlc in self.pending_outbound_htlcs.iter() {
2061                         if htlc.state == OutboundHTLCState::LocalAnnounced {
2062                                 return Ok((None, None, dropped_outbound_htlcs));
2063                         }
2064                 }
2065
2066                 let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
2067                         None
2068                 } else {
2069                         Some(msgs::Shutdown {
2070                                 channel_id: self.channel_id,
2071                                 scriptpubkey: our_closing_script,
2072                         })
2073                 };
2074
2075                 self.channel_state |= ChannelState::LocalShutdownSent as u32;
2076                 self.channel_update_count += 1;
2077                 if self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() && self.channel_outbound {
2078                         // There are no more HTLCs and we're the funder, this means we start the closing_signed
2079                         // dance with an initial fee proposal!
2080                         self.last_sent_closing_fee = Some((proposed_feerate.unwrap(), proposed_fee.unwrap()));
2081                         Ok((our_shutdown, Some(msgs::ClosingSigned {
2082                                 channel_id: self.channel_id,
2083                                 fee_satoshis: proposed_fee.unwrap(),
2084                                 signature: our_sig.unwrap(),
2085                         }), dropped_outbound_htlcs))
2086                 } else {
2087                         Ok((our_shutdown, None, dropped_outbound_htlcs))
2088                 }
2089         }
2090
2091         pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), HandleError> {
2092                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
2093                         return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", action: None});
2094                 }
2095                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2096                         return Err(HandleError{err: "Peer sent closing_signed when we needed a channel_reestablish", action: Some(msgs::ErrorAction::SendErrorMessage{msg: msgs::ErrorMessage{data: "Peer sent closing_signed when we needed a channel_reestablish".to_string(), channel_id: msg.channel_id}})});
2097                 }
2098                 if !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() {
2099                         return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", action: None});
2100                 }
2101                 if msg.fee_satoshis > 21000000 * 10000000 {
2102                         return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", action: None});
2103                 }
2104
2105                 let funding_redeemscript = self.get_funding_redeemscript();
2106                 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
2107                 if used_total_fee != msg.fee_satoshis {
2108                         return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", action: None});
2109                 }
2110                 let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2111
2112                 match self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()) {
2113                         Ok(_) => {},
2114                         Err(_e) => {
2115                                 // The remote end may have decided to revoke their output due to inconsistent dust
2116                                 // limits, so check for that case by re-checking the signature here.
2117                                 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
2118                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2119                                 secp_call!(self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid closing tx signature from peer", self.channel_id());
2120                         },
2121                 };
2122
2123                 if let Some((_, last_fee)) = self.last_sent_closing_fee {
2124                         if last_fee == msg.fee_satoshis {
2125                                 self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
2126                                 self.channel_state = ChannelState::ShutdownComplete as u32;
2127                                 self.channel_update_count += 1;
2128                                 return Ok((None, Some(closing_tx)));
2129                         }
2130                 }
2131
2132                 macro_rules! propose_new_feerate {
2133                         ($new_feerate: expr) => {
2134                                 let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
2135                                 let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 1000, false);
2136                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
2137                                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
2138                                 self.last_sent_closing_fee = Some(($new_feerate, used_total_fee));
2139                                 return Ok((Some(msgs::ClosingSigned {
2140                                         channel_id: self.channel_id,
2141                                         fee_satoshis: used_total_fee,
2142                                         signature: our_sig,
2143                                 }), None))
2144                         }
2145                 }
2146
2147                 let proposed_sat_per_kw = msg.fee_satoshis * 1000 / closing_tx.get_weight();
2148                 if self.channel_outbound {
2149                         let our_max_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
2150                         if proposed_sat_per_kw > our_max_feerate {
2151                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
2152                                         if our_max_feerate <= last_feerate {
2153                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", action: None});
2154                                         }
2155                                 }
2156                                 propose_new_feerate!(our_max_feerate);
2157                         }
2158                 } else {
2159                         let our_min_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2160                         if proposed_sat_per_kw < our_min_feerate {
2161                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
2162                                         if our_min_feerate >= last_feerate {
2163                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", action: None});
2164                                         }
2165                                 }
2166                                 propose_new_feerate!(our_min_feerate);
2167                         }
2168                 }
2169
2170                 let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
2171                 self.channel_state = ChannelState::ShutdownComplete as u32;
2172                 self.channel_update_count += 1;
2173
2174                 Ok((Some(msgs::ClosingSigned {
2175                         channel_id: self.channel_id,
2176                         fee_satoshis: msg.fee_satoshis,
2177                         signature: our_sig,
2178                 }), Some(closing_tx)))
2179         }
2180
2181         // Public utilities:
2182
2183         pub fn channel_id(&self) -> [u8; 32] {
2184                 self.channel_id
2185         }
2186
2187         /// Gets the "user_id" value passed into the construction of this channel. It has no special
2188         /// meaning and exists only to allow users to have a persistent identifier of a channel.
2189         pub fn get_user_id(&self) -> u64 {
2190                 self.user_id
2191         }
2192
2193         /// May only be called after funding has been initiated (ie is_funding_initiated() is true)
2194         pub fn channel_monitor(&self) -> ChannelMonitor {
2195                 if self.channel_state < ChannelState::FundingCreated as u32 {
2196                         panic!("Can't get a channel monitor until funding has been created");
2197                 }
2198                 self.channel_monitor.clone()
2199         }
2200
2201         /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
2202         /// is_usable() returns true).
2203         /// Allowed in any state (including after shutdown)
2204         pub fn get_short_channel_id(&self) -> Option<u64> {
2205                 self.short_channel_id
2206         }
2207
2208         /// Returns the funding_txo we either got from our peer, or were given by
2209         /// get_outbound_funding_created.
2210         pub fn get_funding_txo(&self) -> Option<OutPoint> {
2211                 self.channel_monitor.get_funding_txo()
2212         }
2213
2214         /// Allowed in any state (including after shutdown)
2215         pub fn get_their_node_id(&self) -> PublicKey {
2216                 self.their_node_id
2217         }
2218
2219         /// Allowed in any state (including after shutdown)
2220         pub fn get_our_htlc_minimum_msat(&self) -> u64 {
2221                 self.our_htlc_minimum_msat
2222         }
2223
2224         pub fn get_value_satoshis(&self) -> u64 {
2225                 self.channel_value_satoshis
2226         }
2227
2228         //TODO: Testing purpose only, should be changed in another way after #81
2229         #[cfg(test)]
2230         pub fn get_local_keys(&self) -> &ChannelKeys {
2231                 &self.local_keys
2232         }
2233
2234         /// Allowed in any state (including after shutdown)
2235         pub fn get_channel_update_count(&self) -> u32 {
2236                 self.channel_update_count
2237         }
2238
2239         pub fn should_announce(&self) -> bool {
2240                 self.announce_publicly
2241         }
2242
2243         /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
2244         /// Allowed in any state (including after shutdown)
2245         pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
2246                 // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
2247                 // output value back into a transaction with the regular channel output:
2248
2249                 // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
2250                 let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT) / 1000;
2251
2252                 if self.channel_outbound {
2253                         // + the marginal fee increase cost to us in the commitment transaction:
2254                         res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC / 1000;
2255                 }
2256
2257                 // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
2258                 res += fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT / 1000;
2259
2260                 res as u32
2261         }
2262
2263         /// Returns true if we've ever received a message from the remote end for this Channel
2264         pub fn have_received_message(&self) -> bool {
2265                 self.channel_state > (ChannelState::OurInitSent as u32)
2266         }
2267
2268         /// Returns true if this channel is fully established and not known to be closing.
2269         /// Allowed in any state (including after shutdown)
2270         pub fn is_usable(&self) -> bool {
2271                 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
2272                 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
2273         }
2274
2275         /// Returns true if this channel is currently available for use. This is a superset of
2276         /// is_usable() and considers things like the channel being temporarily disabled.
2277         /// Allowed in any state (including after shutdown)
2278         pub fn is_live(&self) -> bool {
2279                 self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32) == 0)
2280         }
2281
2282         /// Returns true if funding_created was sent/received.
2283         pub fn is_funding_initiated(&self) -> bool {
2284                 self.channel_state >= ChannelState::FundingCreated as u32
2285         }
2286
2287         /// Returns true if this channel is fully shut down. True here implies that no further actions
2288         /// may/will be taken on this channel, and thus this object should be freed. Any future changes
2289         /// will be handled appropriately by the chain monitor.
2290         pub fn is_shutdown(&self) -> bool {
2291                 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32  {
2292                         assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
2293                         true
2294                 } else { false }
2295         }
2296
2297         /// Called by channelmanager based on chain blocks being connected.
2298         /// Note that we only need to use this to detect funding_signed, anything else is handled by
2299         /// the channel_monitor.
2300         /// In case of Err, the channel may have been closed, at which point the standard requirements
2301         /// apply - no calls may be made except those explicitly stated to be allowed post-shutdown.
2302         /// Only returns an ErrorAction of DisconnectPeer, if Err.
2303         pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Result<Option<msgs::FundingLocked>, HandleError> {
2304                 let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
2305                 if self.funding_tx_confirmations > 0 {
2306                         if header.bitcoin_hash() != self.last_block_connected {
2307                                 self.last_block_connected = header.bitcoin_hash();
2308                                 self.funding_tx_confirmations += 1;
2309                                 if self.funding_tx_confirmations == Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat) as u64 {
2310                                         let need_commitment_update = if non_shutdown_state == ChannelState::FundingSent as u32 {
2311                                                 self.channel_state |= ChannelState::OurFundingLocked as u32;
2312                                                 true
2313                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
2314                                                 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
2315                                                 self.channel_update_count += 1;
2316                                                 true
2317                                         } else if self.channel_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
2318                                                 // We got a reorg but not enough to trigger a force close, just update
2319                                                 // funding_tx_confirmed_in and return.
2320                                                 false
2321                                         } else if self.channel_state < ChannelState::ChannelFunded as u32 {
2322                                                 panic!("Started confirming a channel in a state pre-FundingSent?: {}", self.channel_state);
2323                                         } else {
2324                                                 // We got a reorg but not enough to trigger a force close, just update
2325                                                 // funding_tx_confirmed_in and return.
2326                                                 false
2327                                         };
2328                                         self.funding_tx_confirmed_in = Some(header.bitcoin_hash());
2329
2330                                         //TODO: Note that this must be a duplicate of the previous commitment point they sent us,
2331                                         //as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
2332                                         //they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
2333                                         //a protocol oversight, but I assume I'm just missing something.
2334                                         if need_commitment_update {
2335                                                 let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2336                                                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2337                                                 return Ok(Some(msgs::FundingLocked {
2338                                                         channel_id: self.channel_id,
2339                                                         next_per_commitment_point: next_per_commitment_point,
2340                                                 }));
2341                                         }
2342                                 }
2343                         }
2344                 }
2345                 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
2346                         for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
2347                                 if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().txid {
2348                                         let txo_idx = self.channel_monitor.get_funding_txo().unwrap().index as usize;
2349                                         if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
2350                                                         tx.output[txo_idx].value != self.channel_value_satoshis {
2351                                                 if self.channel_outbound {
2352                                                         // If we generated the funding transaction and it doesn't match what it
2353                                                         // should, the client is really broken and we should just panic and
2354                                                         // tell them off. That said, because hash collisions happen with high
2355                                                         // probability in fuzztarget mode, if we're fuzzing we just close the
2356                                                         // channel and move on.
2357                                                         #[cfg(not(feature = "fuzztarget"))]
2358                                                         panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
2359                                                 }
2360                                                 self.channel_state = ChannelState::ShutdownComplete as u32;
2361                                                 self.channel_update_count += 1;
2362                                                 return Err(HandleError{err: "funding tx had wrong script/value", action: Some(ErrorAction::DisconnectPeer{msg: None})});
2363                                         } else {
2364                                                 self.funding_tx_confirmations = 1;
2365                                                 self.short_channel_id = Some(((height as u64)          << (5*8)) |
2366                                                                              ((*index_in_block as u64) << (2*8)) |
2367                                                                              ((txo_idx as u64)         << (0*8)));
2368                                         }
2369                                 }
2370                         }
2371                 }
2372                 Ok(None)
2373         }
2374
2375         /// Called by channelmanager based on chain blocks being disconnected.
2376         /// Returns true if we need to close the channel now due to funding transaction
2377         /// unconfirmation/reorg.
2378         pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
2379                 if self.funding_tx_confirmations > 0 {
2380                         self.funding_tx_confirmations -= 1;
2381                         if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
2382                                 return true;
2383                         }
2384                 }
2385                 if Some(header.bitcoin_hash()) == self.funding_tx_confirmed_in {
2386                         self.funding_tx_confirmations = Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat) as u64 - 1;
2387                 }
2388                 false
2389         }
2390
2391         // Methods to get unprompted messages to send to the remote end (or where we already returned
2392         // something in the handler for the message that prompted this message):
2393
2394         pub fn get_open_channel(&self, chain_hash: Sha256dHash, fee_estimator: &FeeEstimator) -> msgs::OpenChannel {
2395                 if !self.channel_outbound {
2396                         panic!("Tried to open a channel for an inbound channel?");
2397                 }
2398                 if self.channel_state != ChannelState::OurInitSent as u32 {
2399                         panic!("Cannot generate an open_channel after we've moved forward");
2400                 }
2401
2402                 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2403                         panic!("Tried to send an open_channel for a channel that has already advanced");
2404                 }
2405
2406                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2407
2408                 msgs::OpenChannel {
2409                         chain_hash: chain_hash,
2410                         temporary_channel_id: self.channel_id,
2411                         funding_satoshis: self.channel_value_satoshis,
2412                         push_msat: self.channel_value_satoshis * 1000 - self.value_to_self_msat,
2413                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2414                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2415                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2416                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2417                         feerate_per_kw: fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) as u32,
2418                         to_self_delay: BREAKDOWN_TIMEOUT,
2419                         max_accepted_htlcs: OUR_MAX_HTLCS,
2420                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2421                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2422                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2423                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2424                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2425                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2426                         channel_flags: if self.announce_publicly {1} else {0},
2427                         shutdown_scriptpubkey: None,
2428                 }
2429         }
2430
2431         pub fn get_accept_channel(&self) -> msgs::AcceptChannel {
2432                 if self.channel_outbound {
2433                         panic!("Tried to send accept_channel for an outbound channel?");
2434                 }
2435                 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
2436                         panic!("Tried to send accept_channel after channel had moved forward");
2437                 }
2438                 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2439                         panic!("Tried to send an accept_channel for a channel that has already advanced");
2440                 }
2441
2442                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2443
2444                 msgs::AcceptChannel {
2445                         temporary_channel_id: self.channel_id,
2446                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2447                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2448                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2449                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2450                         minimum_depth: Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat),
2451                         to_self_delay: BREAKDOWN_TIMEOUT,
2452                         max_accepted_htlcs: OUR_MAX_HTLCS,
2453                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2454                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2455                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2456                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2457                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2458                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2459                         shutdown_scriptpubkey: None,
2460                 }
2461         }
2462
2463         fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), HandleError> {
2464                 let funding_script = self.get_funding_redeemscript();
2465
2466                 let remote_keys = self.build_remote_transaction_keys()?;
2467                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
2468                 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();
2469
2470                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
2471                 Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key), remote_initial_commitment_tx))
2472         }
2473
2474         /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
2475         /// a funding_created message for the remote peer.
2476         /// Panics if called at some time other than immediately after initial handshake, if called twice,
2477         /// or if called on an inbound channel.
2478         /// Note that channel_id changes during this call!
2479         /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
2480         pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor), HandleError> {
2481                 if !self.channel_outbound {
2482                         panic!("Tried to create outbound funding_created message on an inbound channel!");
2483                 }
2484                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
2485                         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)");
2486                 }
2487                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) ||
2488                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
2489                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
2490                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
2491                 }
2492
2493                 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
2494                 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
2495
2496                 let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
2497                         Ok(res) => res,
2498                         Err(e) => {
2499                                 log_error!(self, "Got bad signatures: {}!", e.err);
2500                                 self.channel_monitor.unset_funding_info();
2501                                 return Err(e);
2502                         }
2503                 };
2504
2505                 let temporary_channel_id = self.channel_id;
2506
2507                 // Now that we're past error-generating stuff, update our local state:
2508                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
2509                 self.channel_state = ChannelState::FundingCreated as u32;
2510                 self.channel_id = funding_txo.to_channel_id();
2511                 self.cur_remote_commitment_transaction_number -= 1;
2512
2513                 Ok((msgs::FundingCreated {
2514                         temporary_channel_id: temporary_channel_id,
2515                         funding_txid: funding_txo.txid,
2516                         funding_output_index: funding_txo.index,
2517                         signature: our_signature
2518                 }, self.channel_monitor.clone()))
2519         }
2520
2521         /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
2522         /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
2523         /// available for use (have exchanged FundingLocked messages in both directions). Should be used
2524         /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
2525         /// Will only fail if we're not in a state where channel_announcement may be sent (including
2526         /// closing).
2527         /// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
2528         /// https://github.com/lightningnetwork/lightning-rfc/issues/468
2529         pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), HandleError> {
2530                 if !self.announce_publicly {
2531                         return Err(HandleError{err: "Channel is not available for public announcements", action: Some(msgs::ErrorAction::IgnoreError)});
2532                 }
2533                 if self.channel_state & (ChannelState::ChannelFunded as u32) == 0 {
2534                         return Err(HandleError{err: "Cannot get a ChannelAnnouncement until the channel funding has been locked", action: Some(msgs::ErrorAction::IgnoreError)});
2535                 }
2536                 if (self.channel_state & (ChannelState::LocalShutdownSent as u32 | ChannelState::ShutdownComplete as u32)) != 0 {
2537                         return Err(HandleError{err: "Cannot get a ChannelAnnouncement once the channel is closing", action: Some(msgs::ErrorAction::IgnoreError)});
2538                 }
2539
2540                 let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
2541                 let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key);
2542
2543                 let msg = msgs::UnsignedChannelAnnouncement {
2544                         features: msgs::GlobalFeatures::new(),
2545                         chain_hash: chain_hash,
2546                         short_channel_id: self.get_short_channel_id().unwrap(),
2547                         node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
2548                         node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
2549                         bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey.unwrap() },
2550                         bitcoin_key_2: if were_node_one { self.their_funding_pubkey.unwrap() } else { our_bitcoin_key },
2551                         excess_data: Vec::new(),
2552                 };
2553
2554                 let msghash = Message::from_slice(&Sha256dHash::from_data(&msg.encode()[..])[..]).unwrap();
2555                 let sig = self.secp_ctx.sign(&msghash, &self.local_keys.funding_key);
2556
2557                 Ok((msg, sig))
2558         }
2559
2560         /// May panic if called on a channel that wasn't immediately-previously
2561         /// self.remove_uncommitted_htlcs_and_mark_paused()'d
2562         pub fn get_channel_reestablish(&self) -> msgs::ChannelReestablish {
2563                 assert_eq!(self.channel_state & ChannelState::PeerDisconnected as u32, ChannelState::PeerDisconnected as u32);
2564                 msgs::ChannelReestablish {
2565                         channel_id: self.channel_id(),
2566                         next_local_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number,
2567                         next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number,
2568                         data_loss_protect: None,
2569                 }
2570         }
2571
2572
2573         // Send stuff to our remote peers:
2574
2575         /// Adds a pending outbound HTLC to this channel, note that you probably want
2576         /// send_htlc_and_commit instead cause you'll want both messages at once.
2577         /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
2578         /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
2579         /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
2580         /// You MUST call send_commitment prior to any other calls on this Channel
2581         pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, HandleError> {
2582                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
2583                         return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", action: None});
2584                 }
2585
2586                 if amount_msat > self.channel_value_satoshis * 1000 {
2587                         return Err(HandleError{err: "Cannot send more than the total value of the channel", action: None});
2588                 }
2589                 if amount_msat < self.their_htlc_minimum_msat {
2590                         return Err(HandleError{err: "Cannot send less than their minimum HTLC value", action: None});
2591                 }
2592
2593                 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) == (ChannelState::PeerDisconnected as u32) {
2594                         // Note that this should never really happen, if we're !is_live() on receipt of an
2595                         // incoming HTLC for relay will result in us rejecting the HTLC and we won't allow
2596                         // the user to send directly into a !is_live() channel. However, if we
2597                         // disconnected during the time the previous hop was doing the commitment dance we may
2598                         // end up getting here after the forwarding delay. In any case, returning an
2599                         // IgnoreError will get ChannelManager to do the right thing and fail backwards now.
2600                         return Err(HandleError{err: "Cannot send an HTLC while disconnected", action: Some(ErrorAction::IgnoreError)});
2601                 }
2602
2603                 let (_, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(false);
2604                 if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
2605                         return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", action: None});
2606                 }
2607                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
2608                 // Check their_max_htlc_value_in_flight_msat
2609                 if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
2610                         return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", action: None});
2611                 }
2612                 // Check their_channel_reserve_satoshis:
2613                 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 {
2614                         return Err(HandleError{err: "Cannot send value that would put us over our reserve value", action: None});
2615                 }
2616
2617                 //TODO: Check cltv_expiry? Do this in channel manager?
2618
2619                 // Now update local state:
2620                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2621                         //TODO: Check the limits *including* other pending holding cell HTLCs!
2622                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
2623                                 amount_msat: amount_msat,
2624                                 payment_hash: payment_hash,
2625                                 cltv_expiry: cltv_expiry,
2626                                 source,
2627                                 onion_routing_packet: onion_routing_packet,
2628                                 time_created: Instant::now(),
2629                         });
2630                         return Ok(None);
2631                 }
2632
2633                 self.pending_outbound_htlcs.push(OutboundHTLCOutput {
2634                         htlc_id: self.next_local_htlc_id,
2635                         amount_msat: amount_msat,
2636                         payment_hash: payment_hash.clone(),
2637                         cltv_expiry: cltv_expiry,
2638                         state: OutboundHTLCState::LocalAnnounced,
2639                         source,
2640                         fail_reason: None,
2641                 });
2642
2643                 let res = msgs::UpdateAddHTLC {
2644                         channel_id: self.channel_id,
2645                         htlc_id: self.next_local_htlc_id,
2646                         amount_msat: amount_msat,
2647                         payment_hash: payment_hash,
2648                         cltv_expiry: cltv_expiry,
2649                         onion_routing_packet: onion_routing_packet,
2650                 };
2651                 self.next_local_htlc_id += 1;
2652
2653                 Ok(Some(res))
2654         }
2655
2656         /// Creates a signed commitment transaction to send to the remote peer.
2657         /// Always returns a Channel-failing HandleError::action if an immediately-preceding (read: the
2658         /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
2659         /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
2660         pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
2661                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2662                         panic!("Cannot create commitment tx until channel is fully established");
2663                 }
2664                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2665                         panic!("Cannot create commitment tx until remote revokes their previous commitment");
2666                 }
2667                 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) == (ChannelState::PeerDisconnected as u32) {
2668                         panic!("Cannot create commitment tx while disconnected, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
2669                 }
2670                 let mut have_updates = false; // TODO initialize with "have we sent a fee update?"
2671                 for htlc in self.pending_outbound_htlcs.iter() {
2672                         if htlc.state == OutboundHTLCState::LocalAnnounced {
2673                                 have_updates = true;
2674                         }
2675                         if have_updates { break; }
2676                 }
2677                 if !have_updates {
2678                         panic!("Cannot create commitment tx until we have some updates to send");
2679                 }
2680                 self.send_commitment_no_status_check()
2681         }
2682         /// Only fails in case of bad keys
2683         fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
2684                 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
2685                 // fail to generate this, we still are at least at a position where upgrading their status
2686                 // is acceptable.
2687                 for htlc in self.pending_inbound_htlcs.iter_mut() {
2688                         if htlc.state == InboundHTLCState::AwaitingRemoteRevokeToAnnounce {
2689                                 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke;
2690                         }
2691                 }
2692                 for htlc in self.pending_outbound_htlcs.iter_mut() {
2693                         if htlc.state == OutboundHTLCState::AwaitingRemoteRevokeToRemove {
2694                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
2695                         }
2696                 }
2697
2698                 match self.send_commitment_no_state_update() {
2699                         Ok((res, remote_commitment_tx)) => {
2700                                 // Update state now that we've passed all the can-fail calls...
2701                                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1, self.cur_remote_commitment_transaction_number);
2702                                 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
2703                                 Ok((res, self.channel_monitor.clone()))
2704                         },
2705                         Err(e) => Err(e),
2706                 }
2707         }
2708
2709         /// Only fails in case of bad keys. Used for channel_reestablish commitment_signed generation
2710         /// when we shouldn't change HTLC/channel state.
2711         fn send_commitment_no_state_update(&self) -> Result<(msgs::CommitmentSigned, (Transaction, Vec<HTLCOutputInCommitment>)), HandleError> {
2712                 let funding_script = self.get_funding_redeemscript();
2713
2714                 let remote_keys = self.build_remote_transaction_keys()?;
2715                 let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true);
2716                 let remote_commitment_txid = remote_commitment_tx.0.txid();
2717                 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();
2718                 let our_sig = self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key);
2719
2720                 let mut htlc_sigs = Vec::new();
2721
2722                 for ref htlc in remote_commitment_tx.1.iter() {
2723                         let htlc_tx = self.build_htlc_transaction(&remote_commitment_txid, htlc, false, &remote_keys);
2724                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &remote_keys);
2725                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
2726                         let our_htlc_key = secp_derived_key!(chan_utils::derive_private_key(&self.secp_ctx, &remote_keys.per_commitment_point, &self.local_keys.htlc_base_key), self.channel_id());
2727                         htlc_sigs.push(self.secp_ctx.sign(&htlc_sighash, &our_htlc_key));
2728                 }
2729
2730                 Ok((msgs::CommitmentSigned {
2731                         channel_id: self.channel_id,
2732                         signature: our_sig,
2733                         htlc_signatures: htlc_sigs,
2734                 }, remote_commitment_tx))
2735         }
2736
2737         /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
2738         /// to send to the remote peer in one go.
2739         /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
2740         /// more info.
2741         pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: [u8; 32], cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitor)>, HandleError> {
2742                 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet)? {
2743                         Some(update_add_htlc) => {
2744                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2745                                 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
2746                         },
2747                         None => Ok(None)
2748                 }
2749         }
2750
2751         /// Begins the shutdown process, getting a message for the remote peer and returning all
2752         /// holding cell HTLCs for payment failure.
2753         pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<(HTLCSource, [u8; 32])>), HandleError> {
2754                 for htlc in self.pending_outbound_htlcs.iter() {
2755                         if htlc.state == OutboundHTLCState::LocalAnnounced {
2756                                 return Err(HandleError{err: "Cannot begin shutdown with pending HTLCs, call send_commitment first", action: None});
2757                         }
2758                 }
2759                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
2760                         return Err(HandleError{err: "Shutdown already in progress", action: None});
2761                 }
2762                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2763                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2764                         return Err(HandleError{err: "Cannot begin shutdown while peer is disconnected, maybe force-close instead?", action: None});
2765                 }
2766
2767                 let our_closing_script = self.get_closing_scriptpubkey();
2768
2769                 // From here on out, we may not fail!
2770                 if self.channel_state < ChannelState::FundingSent as u32 {
2771                         self.channel_state = ChannelState::ShutdownComplete as u32;
2772                 } else {
2773                         self.channel_state |= ChannelState::LocalShutdownSent as u32;
2774                 }
2775                 self.channel_update_count += 1;
2776
2777                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2778                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2779                 // cell HTLCs and return them to fail the payment.
2780                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2781                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2782                         match htlc_update {
2783                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2784                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
2785                                         false
2786                                 },
2787                                 _ => true
2788                         }
2789                 });
2790
2791                 Ok((msgs::Shutdown {
2792                         channel_id: self.channel_id,
2793                         scriptpubkey: our_closing_script,
2794                 }, dropped_outbound_htlcs))
2795         }
2796
2797         /// Gets the latest commitment transaction and any dependant transactions for relay (forcing
2798         /// shutdown of this channel - no more calls into this Channel may be made afterwards except
2799         /// those explicitly stated to be allowed after shutdown completes, eg some simple getters).
2800         /// Also returns the list of payment_hashes for channels which we can safely fail backwards
2801         /// immediately (others we will have to allow to time out).
2802         pub fn force_shutdown(&mut self) -> (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>) {
2803                 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
2804
2805                 // We go ahead and "free" any holding cell HTLCs or HTLCs we haven't yet committed to and
2806                 // return them to fail the payment.
2807                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2808                 for htlc_update in self.holding_cell_htlc_updates.drain(..) {
2809                         match htlc_update {
2810                                 HTLCUpdateAwaitingACK::AddHTLC { source, payment_hash, .. } => {
2811                                         dropped_outbound_htlcs.push((source, payment_hash));
2812                                 },
2813                                 _ => {}
2814                         }
2815                 }
2816
2817                 for _htlc in self.pending_outbound_htlcs.drain(..) {
2818                         //TODO: Do something with the remaining HTLCs
2819                         //(we need to have the ChannelManager monitor them so we can claim the inbound HTLCs
2820                         //which correspond)
2821                 }
2822
2823                 self.channel_state = ChannelState::ShutdownComplete as u32;
2824                 self.channel_update_count += 1;
2825                 let mut res = Vec::new();
2826                 mem::swap(&mut res, &mut self.last_local_commitment_txn);
2827                 (res, dropped_outbound_htlcs)
2828         }
2829 }
2830
2831 #[cfg(test)]
2832 mod tests {
2833         use bitcoin::util::hash::Sha256dHash;
2834         use bitcoin::util::bip143;
2835         use bitcoin::network::serialize::serialize;
2836         use bitcoin::blockdata::script::Script;
2837         use bitcoin::blockdata::transaction::Transaction;
2838         use hex;
2839         use ln::channelmanager::HTLCSource;
2840         use ln::channel::{Channel,ChannelKeys,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,TxCreationKeys};
2841         use ln::channel::MAX_FUNDING_SATOSHIS;
2842         use ln::chan_utils;
2843         use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
2844         use chain::transaction::OutPoint;
2845         use util::test_utils;
2846         use util::logger::Logger;
2847         use secp256k1::{Secp256k1,Message,Signature};
2848         use secp256k1::key::{SecretKey,PublicKey};
2849         use crypto::sha2::Sha256;
2850         use crypto::digest::Digest;
2851         use std::sync::Arc;
2852
2853         struct TestFeeEstimator {
2854                 fee_est: u64
2855         }
2856         impl FeeEstimator for TestFeeEstimator {
2857                 fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
2858                         self.fee_est
2859                 }
2860         }
2861
2862         #[test]
2863         fn test_max_funding_satoshis() {
2864                 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
2865                         "MAX_FUNDING_SATOSHIS is greater than all satoshis on existence");
2866         }
2867
2868         #[test]
2869         fn outbound_commitment_test() {
2870                 // Test vectors from BOLT 3 Appendix C:
2871                 let feeest = TestFeeEstimator{fee_est: 15000};
2872                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
2873                 let secp_ctx = Secp256k1::new();
2874
2875                 let chan_keys = ChannelKeys {
2876                         funding_key: SecretKey::from_slice(&secp_ctx, &hex::decode("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
2877                         payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
2878                         delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
2879                         htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
2880
2881                         // These aren't set in the test vectors:
2882                         revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2883                         channel_close_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2884                         channel_monitor_claim_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2885                         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],
2886                 };
2887                 assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).serialize()[..],
2888                                 hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
2889
2890                 let their_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap());
2891                 let mut chan = Channel::new_outbound(&feeest, chan_keys, their_node_id, 10000000, 100000, false, 42, Arc::clone(&logger)).unwrap(); // Nothing uses their network key in this test
2892                 chan.their_to_self_delay = 144;
2893                 chan.our_dust_limit_satoshis = 546;
2894
2895                 let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
2896                 chan.channel_monitor.set_funding_info((funding_info, Script::new()));
2897
2898                 chan.their_payment_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
2899                 assert_eq!(chan.their_payment_basepoint.unwrap().serialize()[..],
2900                                 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
2901
2902                 chan.their_funding_pubkey = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13").unwrap()[..]).unwrap()));
2903                 assert_eq!(chan.their_funding_pubkey.unwrap().serialize()[..],
2904                                 hex::decode("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
2905
2906                 chan.their_htlc_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
2907                 assert_eq!(chan.their_htlc_basepoint.unwrap().serialize()[..],
2908                                 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
2909
2910                 chan.their_revocation_basepoint = Some(PublicKey::from_slice(&secp_ctx, &hex::decode("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap());
2911
2912                 // We can't just use build_local_transaction_keys here as the per_commitment_secret is not
2913                 // derived from a commitment_seed, so instead we copy it here and call
2914                 // build_commitment_transaction.
2915                 let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.delayed_payment_base_key);
2916                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
2917                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
2918                 let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.htlc_base_key);
2919                 let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &chan.their_revocation_basepoint.unwrap(), &chan.their_payment_basepoint.unwrap(), &chan.their_htlc_basepoint.unwrap()).unwrap();
2920
2921                 let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
2922
2923                 macro_rules! test_commitment {
2924                         ( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
2925                                 unsigned_tx = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false);
2926                                 let their_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
2927                                 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();
2928                                 secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey.unwrap()).unwrap();
2929
2930                                 chan.sign_commitment_transaction(&mut unsigned_tx.0, &their_signature);
2931
2932                                 assert_eq!(serialize(&unsigned_tx.0).unwrap()[..],
2933                                                 hex::decode($tx_hex).unwrap()[..]);
2934                         };
2935                 }
2936
2937                 macro_rules! test_htlc_output {
2938                         ( $htlc_idx: expr, $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr ) => {
2939                                 let remote_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
2940
2941                                 let ref htlc = unsigned_tx.1[$htlc_idx];
2942                                 let mut htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys);
2943                                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
2944                                 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
2945                                 secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
2946
2947                                 let mut preimage: Option<[u8; 32]> = None;
2948                                 if !htlc.offered {
2949                                         for i in 0..5 {
2950                                                 let mut sha = Sha256::new();
2951                                                 sha.input(&[i; 32]);
2952
2953                                                 let mut out = [0; 32];
2954                                                 sha.result(&mut out);
2955
2956                                                 if out == htlc.payment_hash {
2957                                                         preimage = Some([i; 32]);
2958                                                 }
2959                                         }
2960
2961                                         assert!(preimage.is_some());
2962                                 }
2963
2964                                 chan.sign_htlc_transaction(&mut htlc_tx, &remote_signature, &preimage, &htlc, &keys).unwrap();
2965                                 assert_eq!(serialize(&htlc_tx).unwrap()[..],
2966                                                 hex::decode($tx_hex).unwrap()[..]);
2967                         };
2968                 }
2969
2970                 {
2971                         // simple commitment tx with no HTLCs
2972                         chan.value_to_self_msat = 7000000000;
2973
2974                         test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
2975                                          "3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
2976                                          "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");
2977                 }
2978
2979                 chan.pending_inbound_htlcs.push({
2980                         let mut out = InboundHTLCOutput{
2981                                 htlc_id: 0,
2982                                 amount_msat: 1000000,
2983                                 cltv_expiry: 500,
2984                                 payment_hash: [0; 32],
2985                                 state: InboundHTLCState::Committed,
2986                                 local_removed_fulfilled: false,
2987                                 pending_forward_state: None,
2988                         };
2989                         let mut sha = Sha256::new();
2990                         sha.input(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
2991                         sha.result(&mut out.payment_hash);
2992                         out
2993                 });
2994                 chan.pending_inbound_htlcs.push({
2995                         let mut out = InboundHTLCOutput{
2996                                 htlc_id: 1,
2997                                 amount_msat: 2000000,
2998                                 cltv_expiry: 501,
2999                                 payment_hash: [0; 32],
3000                                 state: InboundHTLCState::Committed,
3001                                 local_removed_fulfilled: false,
3002                                 pending_forward_state: None,
3003                         };
3004                         let mut sha = Sha256::new();
3005                         sha.input(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
3006                         sha.result(&mut out.payment_hash);
3007                         out
3008                 });
3009                 chan.pending_outbound_htlcs.push({
3010                         let mut out = OutboundHTLCOutput{
3011                                 htlc_id: 2,
3012                                 amount_msat: 2000000,
3013                                 cltv_expiry: 502,
3014                                 payment_hash: [0; 32],
3015                                 state: OutboundHTLCState::Committed,
3016                                 source: HTLCSource::dummy(),
3017                                 fail_reason: None,
3018                         };
3019                         let mut sha = Sha256::new();
3020                         sha.input(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap());
3021                         sha.result(&mut out.payment_hash);
3022                         out
3023                 });
3024                 chan.pending_outbound_htlcs.push({
3025                         let mut out = OutboundHTLCOutput{
3026                                 htlc_id: 3,
3027                                 amount_msat: 3000000,
3028                                 cltv_expiry: 503,
3029                                 payment_hash: [0; 32],
3030                                 state: OutboundHTLCState::Committed,
3031                                 source: HTLCSource::dummy(),
3032                                 fail_reason: None,
3033                         };
3034                         let mut sha = Sha256::new();
3035                         sha.input(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap());
3036                         sha.result(&mut out.payment_hash);
3037                         out
3038                 });
3039                 chan.pending_inbound_htlcs.push({
3040                         let mut out = InboundHTLCOutput{
3041                                 htlc_id: 4,
3042                                 amount_msat: 4000000,
3043                                 cltv_expiry: 504,
3044                                 payment_hash: [0; 32],
3045                                 state: InboundHTLCState::Committed,
3046                                 local_removed_fulfilled: false,
3047                                 pending_forward_state: None,
3048                         };
3049                         let mut sha = Sha256::new();
3050                         sha.input(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap());
3051                         sha.result(&mut out.payment_hash);
3052                         out
3053                 });
3054
3055                 {
3056                         // commitment tx with all five HTLCs untrimmed (minimum feerate)
3057                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3058                         chan.feerate_per_kw = 0;
3059
3060                         test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
3061                                          "30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
3062                                          "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");
3063
3064                         assert_eq!(unsigned_tx.1.len(), 5);
3065
3066                         test_htlc_output!(0,
3067                                           "304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
3068                                           "304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
3069                                           "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");
3070
3071                         test_htlc_output!(1,
3072                                           "3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
3073                                           "3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
3074                                           "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");
3075
3076                         test_htlc_output!(2,
3077                                           "304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
3078                                           "3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
3079                                           "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");
3080
3081                         test_htlc_output!(3,
3082                                           "3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
3083                                           "30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
3084                                           "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");
3085
3086                         test_htlc_output!(4,
3087                                           "304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
3088                                           "30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
3089                                           "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");
3090                 }
3091
3092                 {
3093                         // commitment tx with seven outputs untrimmed (maximum feerate)
3094                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3095                         chan.feerate_per_kw = 647;
3096
3097                         test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
3098                                          "304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
3099                                          "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");
3100
3101                         assert_eq!(unsigned_tx.1.len(), 5);
3102
3103                         test_htlc_output!(0,
3104                                           "30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
3105                                           "304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
3106                                           "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");
3107
3108                         test_htlc_output!(1,
3109                                           "304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
3110                                           "304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
3111                                           "020000000001018323148ce2419f21ca3d6780053747715832e18ac780931a514b187768882bb60100000000000000000124060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e050047304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b00147304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac01008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a914b43e1b38138a41b37f7cd9a1d274bc63e3a9b5d188ac6868f6010000");
3112
3113                         test_htlc_output!(2,
3114                                           "304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
3115                                           "3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
3116                                           "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");
3117
3118                         test_htlc_output!(3,
3119                                           "30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
3120                                           "3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
3121                                           "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");
3122
3123                         test_htlc_output!(4,
3124                                           "3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
3125                                           "304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
3126                                           "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");
3127                 }
3128
3129                 {
3130                         // commitment tx with six outputs untrimmed (minimum feerate)
3131                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3132                         chan.feerate_per_kw = 648;
3133
3134                         test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
3135                                          "3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
3136                                          "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");
3137
3138                         assert_eq!(unsigned_tx.1.len(), 4);
3139
3140                         test_htlc_output!(0,
3141                                           "3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
3142                                           "3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
3143                                           "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");
3144
3145                         test_htlc_output!(1,
3146                                           "3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
3147                                           "304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
3148                                           "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");
3149
3150                         test_htlc_output!(2,
3151                                           "3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
3152                                           "304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
3153                                           "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");
3154
3155                         test_htlc_output!(3,
3156                                           "3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
3157                                           "304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
3158                                           "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");
3159                 }
3160
3161                 {
3162                         // commitment tx with six outputs untrimmed (maximum feerate)
3163                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3164                         chan.feerate_per_kw = 2069;
3165
3166                         test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
3167                                          "304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
3168                                          "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");
3169
3170                         assert_eq!(unsigned_tx.1.len(), 4);
3171
3172                         test_htlc_output!(0,
3173                                           "3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
3174                                           "3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
3175                                           "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");
3176
3177                         test_htlc_output!(1,
3178                                           "3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
3179                                           "3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
3180                                           "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");
3181
3182                         test_htlc_output!(2,
3183                                           "3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
3184                                           "304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
3185                                           "02000000000101ca94a9ad516ebc0c4bdd7b6254871babfa978d5accafb554214137d398bfcf6a020000000000000000015d060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef180147304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f901008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000");
3186
3187                         test_htlc_output!(3,
3188                                           "30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
3189                                           "304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
3190                                           "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");
3191                 }
3192
3193                 {
3194                         // commitment tx with five outputs untrimmed (minimum feerate)
3195                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3196                         chan.feerate_per_kw = 2070;
3197
3198                         test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
3199                                          "30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
3200                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8005d007000000000000220020403d394747cae42e98ff01734ad5c08f82ba123d3d9a620abda88989651e2ab5b80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de843110da966a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e04004730440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd001483045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f3752601475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
3201
3202                         assert_eq!(unsigned_tx.1.len(), 3);
3203
3204                         test_htlc_output!(0,
3205                                           "3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
3206                                           "3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
3207                                           "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");
3208
3209                         test_htlc_output!(1,
3210                                           "3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
3211                                           "3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
3212                                           "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");
3213
3214                         test_htlc_output!(2,
3215                                           "3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
3216                                           "304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
3217                                           "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");
3218                 }
3219
3220                 {
3221                         // commitment tx with five outputs untrimmed (maximum feerate)
3222                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3223                         chan.feerate_per_kw = 2194;
3224
3225                         test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
3226                                          "304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
3227                                          "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");
3228
3229                         assert_eq!(unsigned_tx.1.len(), 3);
3230
3231                         test_htlc_output!(0,
3232                                           "30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
3233                                           "3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
3234                                           "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");
3235
3236                         test_htlc_output!(1,
3237                                           "30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
3238                                           "304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
3239                                           "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");
3240
3241                         test_htlc_output!(2,
3242                                           "3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
3243                                           "3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
3244                                           "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");
3245                 }
3246
3247                 {
3248                         // commitment tx with four outputs untrimmed (minimum feerate)
3249                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3250                         chan.feerate_per_kw = 2195;
3251
3252                         test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
3253                                          "304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
3254                                          "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");
3255
3256                         assert_eq!(unsigned_tx.1.len(), 2);
3257
3258                         test_htlc_output!(0,
3259                                           "3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
3260                                           "3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
3261                                           "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");
3262
3263                         test_htlc_output!(1,
3264                                           "3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
3265                                           "30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
3266                                           "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");
3267                 }
3268
3269                 {
3270                         // commitment tx with four outputs untrimmed (maximum feerate)
3271                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3272                         chan.feerate_per_kw = 3702;
3273
3274                         test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
3275                                          "304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
3276                                          "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");
3277
3278                         assert_eq!(unsigned_tx.1.len(), 2);
3279
3280                         test_htlc_output!(0,
3281                                           "3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
3282                                           "304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
3283                                           "02000000000101b8de11eb51c22498fe39722c7227b6e55ff1a94146cf638458cb9bc6a060d3a30000000000000000000122020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb0147304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a01008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000");
3284
3285                         test_htlc_output!(1,
3286                                           "3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
3287                                           "30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
3288                                           "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");
3289                 }
3290
3291                 {
3292                         // commitment tx with three outputs untrimmed (minimum feerate)
3293                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3294                         chan.feerate_per_kw = 3703;
3295
3296                         test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
3297                                          "3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
3298                                          "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");
3299
3300                         assert_eq!(unsigned_tx.1.len(), 1);
3301
3302                         test_htlc_output!(0,
3303                                           "3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
3304                                           "3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
3305                                           "020000000001011c076aa7fb3d7460d10df69432c904227ea84bbf3134d4ceee5fb0f135ef206d0000000000000000000175050000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500473044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd01483045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
3306                 }
3307
3308                 {
3309                         // commitment tx with three outputs untrimmed (maximum feerate)
3310                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3311                         chan.feerate_per_kw = 4914;
3312
3313                         test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
3314                                          "304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
3315                                          "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");
3316
3317                         assert_eq!(unsigned_tx.1.len(), 1);
3318
3319                         test_htlc_output!(0,
3320                                           "3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
3321                                           "304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
3322                                           "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");
3323                 }
3324
3325                 {
3326                         // commitment tx with two outputs untrimmed (minimum feerate)
3327                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3328                         chan.feerate_per_kw = 4915;
3329
3330                         test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
3331                                          "3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
3332                                          "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");
3333
3334                         assert_eq!(unsigned_tx.1.len(), 0);
3335                 }
3336
3337                 {
3338                         // commitment tx with two outputs untrimmed (maximum feerate)
3339                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3340                         chan.feerate_per_kw = 9651180;
3341
3342                         test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
3343                                          "30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
3344                                          "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");
3345
3346                         assert_eq!(unsigned_tx.1.len(), 0);
3347                 }
3348
3349                 {
3350                         // commitment tx with one output untrimmed (minimum feerate)
3351                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3352                         chan.feerate_per_kw = 9651181;
3353
3354                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
3355                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
3356                                          "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");
3357
3358                         assert_eq!(unsigned_tx.1.len(), 0);
3359                 }
3360
3361                 {
3362                         // commitment tx with fee greater than funder amount
3363                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3364                         chan.feerate_per_kw = 9651936;
3365
3366                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
3367                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
3368                                          "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");
3369
3370                         assert_eq!(unsigned_tx.1.len(), 0);
3371                 }
3372         }
3373
3374         #[test]
3375         fn test_per_commitment_secret_gen() {
3376                 // Test vectors from BOLT 3 Appendix D:
3377
3378                 let mut seed = [0; 32];
3379                 seed[0..32].clone_from_slice(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
3380                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
3381                            hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
3382
3383                 seed[0..32].clone_from_slice(&hex::decode("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
3384                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
3385                            hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
3386
3387                 assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
3388                            hex::decode("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
3389
3390                 assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
3391                            hex::decode("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
3392
3393                 seed[0..32].clone_from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
3394                 assert_eq!(chan_utils::build_commitment_secret(seed, 1),
3395                            hex::decode("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
3396         }
3397
3398         #[test]
3399         fn test_key_derivation() {
3400                 // Test vectors from BOLT 3 Appendix E:
3401                 let secp_ctx = Secp256k1::new();
3402
3403                 let base_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
3404                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
3405
3406                 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret);
3407                 assert_eq!(base_point.serialize()[..], hex::decode("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
3408
3409                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
3410                 assert_eq!(per_commitment_point.serialize()[..], hex::decode("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
3411
3412                 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
3413                                 hex::decode("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
3414
3415                 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
3416                                 SecretKey::from_slice(&secp_ctx, &hex::decode("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
3417
3418                 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
3419                                 hex::decode("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
3420
3421                 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
3422                                 SecretKey::from_slice(&secp_ctx, &hex::decode("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());
3423         }
3424 }