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unwrap channel.get_open_channel
[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, MsgEncodable};
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::sha2::Sha256;
26 use util::logger::Logger;
27 use util::errors::APIError;
28
29 use std;
30 use std::default::Default;
31 use std::{cmp,mem};
32 use std::time::Instant;
33 use std::sync::{Arc};
34
35 pub struct ChannelKeys {
36         pub funding_key: SecretKey,
37         pub revocation_base_key: SecretKey,
38         pub payment_base_key: SecretKey,
39         pub delayed_payment_base_key: SecretKey,
40         pub htlc_base_key: SecretKey,
41         pub channel_close_key: SecretKey,
42         pub channel_monitor_claim_key: SecretKey,
43         pub commitment_seed: [u8; 32],
44 }
45
46 impl ChannelKeys {
47         pub fn new_from_seed(seed: &[u8; 32]) -> Result<ChannelKeys, secp256k1::Error> {
48                 let mut prk = [0; 32];
49                 hkdf_extract(Sha256::new(), b"rust-lightning key gen salt", seed, &mut prk);
50                 let secp_ctx = Secp256k1::without_caps();
51
52                 let mut okm = [0; 32];
53                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning funding key info", &mut okm);
54                 let funding_key = SecretKey::from_slice(&secp_ctx, &okm)?;
55
56                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning revocation base key info", &mut okm);
57                 let revocation_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
58
59                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning payment base key info", &mut okm);
60                 let payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
61
62                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning delayed payment base key info", &mut okm);
63                 let delayed_payment_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
64
65                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning htlc base key info", &mut okm);
66                 let htlc_base_key = SecretKey::from_slice(&secp_ctx, &okm)?;
67
68                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel close key info", &mut okm);
69                 let channel_close_key = SecretKey::from_slice(&secp_ctx, &okm)?;
70
71                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning channel monitor claim key info", &mut okm);
72                 let channel_monitor_claim_key = SecretKey::from_slice(&secp_ctx, &okm)?;
73
74                 hkdf_expand(Sha256::new(), &prk, b"rust-lightning local commitment seed info", &mut okm);
75
76                 Ok(ChannelKeys {
77                         funding_key: funding_key,
78                         revocation_base_key: revocation_base_key,
79                         payment_base_key: payment_base_key,
80                         delayed_payment_base_key: delayed_payment_base_key,
81                         htlc_base_key: htlc_base_key,
82                         channel_close_key: channel_close_key,
83                         channel_monitor_claim_key: channel_monitor_claim_key,
84                         commitment_seed: okm
85                 })
86         }
87 }
88
89 #[derive(PartialEq)]
90 enum InboundHTLCState {
91         /// Added by remote, to be included in next local commitment tx.
92         RemoteAnnounced,
93         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
94         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
95         /// accept this HTLC. Implies AwaitingRemoteRevoke.
96         /// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
97         /// a remote revoke_and_ack on a previous state before we can do so.
98         AwaitingRemoteRevokeToAnnounce,
99         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
100         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
101         /// accept this HTLC. Implies AwaitingRemoteRevoke.
102         /// We have included this HTLC in our latest commitment_signed and are now just waiting on a
103         /// revoke_and_ack.
104         AwaitingAnnouncedRemoteRevoke,
105         Committed,
106         /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
107         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
108         /// we'll drop it.
109         /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
110         /// commitment transaction without it as otherwise we'll have to force-close the channel to
111         /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
112         /// anyway). That said, ChannelMonitor does this for us (see
113         /// ChannelMonitor::would_broadcast_at_height) so we actually remove the HTLC from our own
114         /// local state before then, once we're sure that the next commitment_signed and
115         /// ChannelMonitor::provide_latest_local_commitment_tx_info will not include this HTLC.
116         LocalRemoved,
117 }
118
119 struct InboundHTLCOutput {
120         htlc_id: u64,
121         amount_msat: u64,
122         cltv_expiry: u32,
123         payment_hash: [u8; 32],
124         state: InboundHTLCState,
125         /// If we're in LocalRemoved, set to true if we fulfilled the HTLC, and can claim money
126         local_removed_fulfilled: bool,
127         /// state pre-Committed implies pending_forward_state, otherwise it must be None
128         pending_forward_state: Option<PendingHTLCStatus>,
129 }
130
131 #[derive(PartialEq)]
132 enum OutboundHTLCState {
133         /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
134         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
135         /// we will promote to Committed (note that they may not accept it until the next time we
136         /// revoke, but we dont really care about that:
137         ///  * they've revoked, so worst case we can announce an old state and get our (option on)
138         ///    money back (though we wont), and,
139         ///  * we'll send them a revoke when they send a commitment_signed, and since only they're
140         ///    allowed to remove it, the "can only be removed once committed on both sides" requirement
141         ///    doesn't matter to us and its up to them to enforce it, worst-case they jump ahead but
142         ///    we'll never get out of sync).
143         LocalAnnounced,
144         Committed,
145         /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
146         /// the change (though they'll need to revoke before we fail the payment).
147         RemoteRemoved,
148         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
149         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
150         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
151         /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
152         /// remote revoke_and_ack on a previous state before we can do so.
153         AwaitingRemoteRevokeToRemove,
154         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
155         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
156         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
157         /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
158         /// revoke_and_ack to drop completely.
159         AwaitingRemovedRemoteRevoke,
160 }
161
162 struct OutboundHTLCOutput {
163         htlc_id: u64,
164         amount_msat: u64,
165         cltv_expiry: u32,
166         payment_hash: [u8; 32],
167         state: OutboundHTLCState,
168         source: HTLCSource,
169         /// If we're in a removed state, set if they failed, otherwise None
170         fail_reason: Option<HTLCFailReason>,
171 }
172
173 macro_rules! get_htlc_in_commitment {
174         ($htlc: expr, $offered: expr) => {
175                 HTLCOutputInCommitment {
176                         offered: $offered,
177                         amount_msat: $htlc.amount_msat,
178                         cltv_expiry: $htlc.cltv_expiry,
179                         payment_hash: $htlc.payment_hash,
180                         transaction_output_index: 0
181                 }
182         }
183 }
184
185 /// See AwaitingRemoteRevoke ChannelState for more info
186 enum HTLCUpdateAwaitingACK {
187         AddHTLC {
188                 // always outbound
189                 amount_msat: u64,
190                 cltv_expiry: u32,
191                 payment_hash: [u8; 32],
192                 source: HTLCSource,
193                 onion_routing_packet: msgs::OnionPacket,
194                 time_created: Instant, //TODO: Some kind of timeout thing-a-majig
195         },
196         ClaimHTLC {
197                 payment_preimage: [u8; 32],
198                 htlc_id: u64,
199         },
200         FailHTLC {
201                 htlc_id: u64,
202                 err_packet: msgs::OnionErrorPacket,
203         },
204 }
205
206 enum ChannelState {
207         /// Implies we have (or are prepared to) send our open_channel/accept_channel message
208         OurInitSent = (1 << 0),
209         /// Implies we have received their open_channel/accept_channel message
210         TheirInitSent = (1 << 1),
211         /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
212         /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
213         /// upon receipt of funding_created, so simply skip this state.
214         FundingCreated = 4,
215         /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
216         /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
217         /// and our counterparty consider the funding transaction confirmed.
218         FundingSent = 8,
219         /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
220         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
221         TheirFundingLocked = (1 << 4),
222         /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
223         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
224         OurFundingLocked = (1 << 5),
225         ChannelFunded = 64,
226         /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
227         /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
228         /// messages as then we will be unable to determine which HTLCs they included in their
229         /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
230         /// later.
231         /// Flag is set on ChannelFunded.
232         AwaitingRemoteRevoke = (1 << 7),
233         /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
234         /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
235         /// to respond with our own shutdown message when possible.
236         RemoteShutdownSent = (1 << 8),
237         /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
238         /// point, we may not add any new HTLCs to the channel.
239         /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
240         /// us their shutdown.
241         LocalShutdownSent = (1 << 9),
242         /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
243         /// to drop us, but we store this anyway.
244         ShutdownComplete = (1 << 10),
245 }
246 const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
247
248 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
249 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
250 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
251 // inbound channel.
252 pub struct Channel {
253         user_id: u64,
254
255         channel_id: [u8; 32],
256         channel_state: u32,
257         channel_outbound: bool,
258         secp_ctx: Secp256k1<secp256k1::All>,
259         announce_publicly: bool,
260         channel_value_satoshis: u64,
261
262         local_keys: ChannelKeys,
263
264         // Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
265         // generation start at 0 and count up...this simplifies some parts of implementation at the
266         // cost of others, but should really just be changed.
267
268         cur_local_commitment_transaction_number: u64,
269         cur_remote_commitment_transaction_number: u64,
270         value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
271         pending_inbound_htlcs: Vec<InboundHTLCOutput>,
272         pending_outbound_htlcs: Vec<OutboundHTLCOutput>,
273         holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
274         next_local_htlc_id: u64,
275         next_remote_htlc_id: u64,
276         channel_update_count: u32,
277         feerate_per_kw: u64,
278
279         #[cfg(test)]
280         // Used in ChannelManager's tests to send a revoked transaction
281         pub last_local_commitment_txn: Vec<Transaction>,
282         #[cfg(not(test))]
283         last_local_commitment_txn: Vec<Transaction>,
284
285         last_sent_closing_fee: Option<(u64, u64)>, // (feerate, fee)
286
287         /// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
288         /// to detect unconfirmation after a serialize-unserialize roudtrip where we may not see a full
289         /// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
290         /// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
291         funding_tx_confirmed_in: Option<Sha256dHash>,
292         short_channel_id: Option<u64>,
293         /// Used to deduplicate block_connected callbacks
294         last_block_connected: Sha256dHash,
295         funding_tx_confirmations: u64,
296
297         their_dust_limit_satoshis: u64,
298         our_dust_limit_satoshis: u64,
299         their_max_htlc_value_in_flight_msat: u64,
300         //get_our_max_htlc_value_in_flight_msat(): u64,
301         their_channel_reserve_satoshis: u64,
302         //get_our_channel_reserve_satoshis(): u64,
303         their_htlc_minimum_msat: u64,
304         our_htlc_minimum_msat: u64,
305         their_to_self_delay: u16,
306         //implied by BREAKDOWN_TIMEOUT: our_to_self_delay: u16,
307         their_max_accepted_htlcs: u16,
308         //implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
309
310         their_funding_pubkey: Option<PublicKey>,
311         their_revocation_basepoint: Option<PublicKey>,
312         their_payment_basepoint: Option<PublicKey>,
313         their_delayed_payment_basepoint: Option<PublicKey>,
314         their_htlc_basepoint: Option<PublicKey>,
315         their_cur_commitment_point: Option<PublicKey>,
316
317         their_prev_commitment_point: Option<PublicKey>,
318         their_node_id: PublicKey,
319
320         their_shutdown_scriptpubkey: Option<Script>,
321
322         channel_monitor: ChannelMonitor,
323
324         logger: Arc<Logger>,
325 }
326
327 const OUR_MAX_HTLCS: u16 = 5; //TODO
328 /// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
329 /// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
330 /// really allow for this, so instead we're stuck closing it out at that point.
331 const UNCONF_THRESHOLD: u32 = 6;
332 /// The amount of time we require our counterparty wait to claim their money (ie time between when
333 /// we, or our watchtower, must check for them having broadcast a theft transaction).
334 const BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7; //TODO?
335 /// The amount of time we're willing to wait to claim money back to us
336 const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 14;
337 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
338 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
339 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
340 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?)
341 /// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
342 /// it's 2^24.
343 pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
344
345 macro_rules! secp_call {
346         ( $res: expr, $err: expr, $chan_id: expr ) => {
347                 match $res {
348                         Ok(key) => key,
349                         Err(_) => return Err(HandleError {err: $err, action: Some(msgs::ErrorAction::SendErrorMessage {msg: msgs::ErrorMessage {channel_id: $chan_id, data: $err.to_string()}})})
350                 }
351         };
352 }
353
354 macro_rules! secp_derived_key {
355         ( $res: expr, $chan_id: expr ) => {
356                 secp_call!($res, "Derived invalid key, peer is maliciously selecting parameters", $chan_id)
357         }
358 }
359 impl Channel {
360         // Convert constants + channel value to limits:
361         fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
362                 channel_value_satoshis * 1000 / 10 //TODO
363         }
364
365         /// Guaranteed to return a value no larger than channel_value_satoshis
366         fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
367                 let (q, _) = channel_value_satoshis.overflowing_div(100);
368                 cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
369         }
370
371         fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
372                 at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT / 1000 //TODO
373         }
374
375         fn derive_our_htlc_minimum_msat(_at_open_channel_feerate_per_kw: u64) -> u64 {
376                 1000 // TODO
377         }
378
379         fn derive_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
380                 // Note that in order to comply with BOLT 7 announcement_signatures requirements this must
381                 // be at least 6.
382                 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
383                 CONF_TARGET
384         }
385
386         fn derive_maximum_minimum_depth(_channel_value_satoshis_msat: u64, _value_to_self_msat: u64) -> u32 {
387                 const CONF_TARGET: u32 = 12; //TODO: Should be much higher
388                 CONF_TARGET * 2
389         }
390
391         // Constructors:
392         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> {
393                 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
394                         return Err(APIError::APIMisuseError{err: "funding value > 2^24"});
395                 }
396
397                 if push_msat > channel_value_satoshis * 1000 {
398                         return Err(APIError::APIMisuseError{err: "push value > channel value"});
399                 }
400
401
402                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
403                 if Channel::get_our_channel_reserve_satoshis(channel_value_satoshis) < Channel::derive_our_dust_limit_satoshis(background_feerate) {
404                         return Err(APIError::FeeRateTooHigh{err: format!("Not enough reserve above dust limit can be found at current fee rate({})", background_feerate), feerate: background_feerate});
405                 }
406
407                 let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
408
409                 let secp_ctx = Secp256k1::new();
410                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).serialize());
411                 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();
412                 let channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
413                                                           &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key),
414                                                           &chan_keys.htlc_base_key,
415                                                           BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
416
417                 Ok(Channel {
418                         user_id: user_id,
419
420                         channel_id: rng::rand_u832(),
421                         channel_state: ChannelState::OurInitSent as u32,
422                         channel_outbound: true,
423                         secp_ctx: secp_ctx,
424                         announce_publicly: announce_publicly,
425                         channel_value_satoshis: channel_value_satoshis,
426
427                         local_keys: chan_keys,
428                         cur_local_commitment_transaction_number: (1 << 48) - 1,
429                         cur_remote_commitment_transaction_number: (1 << 48) - 1,
430                         value_to_self_msat: channel_value_satoshis * 1000 - push_msat,
431                         pending_inbound_htlcs: Vec::new(),
432                         pending_outbound_htlcs: Vec::new(),
433                         holding_cell_htlc_updates: Vec::new(),
434                         next_local_htlc_id: 0,
435                         next_remote_htlc_id: 0,
436                         channel_update_count: 1,
437
438                         last_local_commitment_txn: Vec::new(),
439
440                         last_sent_closing_fee: None,
441
442                         funding_tx_confirmed_in: None,
443                         short_channel_id: None,
444                         last_block_connected: Default::default(),
445                         funding_tx_confirmations: 0,
446
447                         feerate_per_kw: feerate,
448                         their_dust_limit_satoshis: 0,
449                         our_dust_limit_satoshis: Channel::derive_our_dust_limit_satoshis(background_feerate),
450                         their_max_htlc_value_in_flight_msat: 0,
451                         their_channel_reserve_satoshis: 0,
452                         their_htlc_minimum_msat: 0,
453                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(feerate),
454                         their_to_self_delay: 0,
455                         their_max_accepted_htlcs: 0,
456
457                         their_funding_pubkey: None,
458                         their_revocation_basepoint: None,
459                         their_payment_basepoint: None,
460                         their_delayed_payment_basepoint: None,
461                         their_htlc_basepoint: None,
462                         their_cur_commitment_point: None,
463
464                         their_prev_commitment_point: None,
465                         their_node_id: their_node_id,
466
467                         their_shutdown_scriptpubkey: None,
468
469                         channel_monitor: channel_monitor,
470
471                         logger,
472                 })
473         }
474
475         fn check_remote_fee(fee_estimator: &FeeEstimator, feerate_per_kw: u32) -> Result<(), HandleError> {
476                 if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) {
477                         return Err(HandleError{err: "Peer's feerate much too low", action: Some(msgs::ErrorAction::DisconnectPeer{ msg: None })});
478                 }
479                 if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) * 2 {
480                         return Err(HandleError{err: "Peer's feerate much too high", action: Some(msgs::ErrorAction::DisconnectPeer{ msg: None })});
481                 }
482                 Ok(())
483         }
484
485         /// Creates a new channel from a remote sides' request for one.
486         /// Assumes chain_hash has already been checked and corresponds with what we expect!
487         /// Generally prefers to take the DisconnectPeer action on failure, as a notice to the sender
488         /// that we're rejecting the new channel.
489         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> {
490                 macro_rules! return_error_message {
491                         ( $msg: expr ) => {
492                                 return Err(HandleError{err: $msg, action: Some(msgs::ErrorAction::SendErrorMessage{ msg: msgs::ErrorMessage { channel_id: msg.temporary_channel_id, data: $msg.to_string() }})});
493                         }
494                 }
495
496                 // Check sanity of message fields:
497                 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
498                         return_error_message!("funding value > 2^24");
499                 }
500                 if msg.channel_reserve_satoshis > msg.funding_satoshis {
501                         return_error_message!("Bogus channel_reserve_satoshis");
502                 }
503                 if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
504                         return_error_message!("push_msat larger than funding value");
505                 }
506                 if msg.dust_limit_satoshis > msg.funding_satoshis {
507                         return_error_message!("Peer never wants payout outputs?");
508                 }
509                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
510                         return_error_message!("Bogus; channel reserve is less than dust limit");
511                 }
512                 if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
513                         return_error_message!("Miminum htlc value is full channel value");
514                 }
515                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw).map_err(|e|
516                         HandleError{err: e.err, action: Some(msgs::ErrorAction::SendErrorMessage{ msg: msgs::ErrorMessage { channel_id: msg.temporary_channel_id, data: e.err.to_string() }})}
517                 )?;
518
519                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
520                         return_error_message!("They wanted our payments to be delayed by a needlessly long period");
521                 }
522                 if msg.max_accepted_htlcs < 1 {
523                         return_error_message!("0 max_accpted_htlcs makes for a useless channel");
524                 }
525                 if msg.max_accepted_htlcs > 483 {
526                         return_error_message!("max_accpted_htlcs > 483");
527                 }
528
529                 // Convert things into internal flags and prep our state:
530
531                 let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
532                 if require_announce && !their_announce {
533                         return_error_message!("Peer tried to open unannounced channel, but we require public ones");
534                 }
535                 if !allow_announce && their_announce {
536                         return_error_message!("Peer tried to open announced channel, but we require private ones");
537                 }
538
539                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
540
541                 let our_dust_limit_satoshis = Channel::derive_our_dust_limit_satoshis(background_feerate);
542                 let our_channel_reserve_satoshis = Channel::get_our_channel_reserve_satoshis(msg.funding_satoshis);
543                 if our_channel_reserve_satoshis < our_dust_limit_satoshis {
544                         return_error_message!("Suitalbe channel reserve not found. aborting");
545                 }
546                 if msg.channel_reserve_satoshis < our_dust_limit_satoshis {
547                         return_error_message!("channel_reserve_satoshis too small");
548                 }
549                 if our_channel_reserve_satoshis < msg.dust_limit_satoshis {
550                         return_error_message!("Dust limit too high for our channel reserve");
551                 }
552
553                 // check if the funder's amount for the initial commitment tx is sufficient
554                 // for full fee payment
555                 let funders_amount_msat = msg.funding_satoshis * 1000 - msg.push_msat;
556                 if funders_amount_msat < background_feerate * COMMITMENT_TX_BASE_WEIGHT {
557                         return_error_message!("Insufficient funding amount for initial commitment");
558                 }
559
560                 let to_local_msat = msg.push_msat;
561                 let to_remote_msat = funders_amount_msat - background_feerate * COMMITMENT_TX_BASE_WEIGHT;
562                 if to_local_msat <= msg.channel_reserve_satoshis * 1000 && to_remote_msat <= our_channel_reserve_satoshis * 1000 {
563                         return_error_message!("Insufficient funding amount for initial commitment");
564                 }
565
566                 let secp_ctx = Secp256k1::new();
567                 let our_channel_monitor_claim_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&secp_ctx, &chan_keys.channel_monitor_claim_key).serialize());
568                 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();
569                 let mut channel_monitor = ChannelMonitor::new(&chan_keys.revocation_base_key,
570                                                               &PublicKey::from_secret_key(&secp_ctx, &chan_keys.delayed_payment_base_key),
571                                                               &chan_keys.htlc_base_key,
572                                                               BREAKDOWN_TIMEOUT, our_channel_monitor_claim_script);
573                 channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
574                 channel_monitor.set_their_to_self_delay(msg.to_self_delay);
575
576                 let mut chan = Channel {
577                         user_id: user_id,
578
579                         channel_id: msg.temporary_channel_id,
580                         channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
581                         channel_outbound: false,
582                         secp_ctx: secp_ctx,
583                         announce_publicly: their_announce,
584
585                         local_keys: chan_keys,
586                         cur_local_commitment_transaction_number: (1 << 48) - 1,
587                         cur_remote_commitment_transaction_number: (1 << 48) - 1,
588                         value_to_self_msat: msg.push_msat,
589                         pending_inbound_htlcs: Vec::new(),
590                         pending_outbound_htlcs: Vec::new(),
591                         holding_cell_htlc_updates: Vec::new(),
592                         next_local_htlc_id: 0,
593                         next_remote_htlc_id: 0,
594                         channel_update_count: 1,
595
596                         last_local_commitment_txn: Vec::new(),
597
598                         last_sent_closing_fee: None,
599
600                         funding_tx_confirmed_in: None,
601                         short_channel_id: None,
602                         last_block_connected: Default::default(),
603                         funding_tx_confirmations: 0,
604
605                         feerate_per_kw: msg.feerate_per_kw as u64,
606                         channel_value_satoshis: msg.funding_satoshis,
607                         their_dust_limit_satoshis: msg.dust_limit_satoshis,
608                         our_dust_limit_satoshis: our_dust_limit_satoshis,
609                         their_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
610                         their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
611                         their_htlc_minimum_msat: msg.htlc_minimum_msat,
612                         our_htlc_minimum_msat: Channel::derive_our_htlc_minimum_msat(msg.feerate_per_kw as u64),
613                         their_to_self_delay: msg.to_self_delay,
614                         their_max_accepted_htlcs: msg.max_accepted_htlcs,
615
616                         their_funding_pubkey: Some(msg.funding_pubkey),
617                         their_revocation_basepoint: Some(msg.revocation_basepoint),
618                         their_payment_basepoint: Some(msg.payment_basepoint),
619                         their_delayed_payment_basepoint: Some(msg.delayed_payment_basepoint),
620                         their_htlc_basepoint: Some(msg.htlc_basepoint),
621                         their_cur_commitment_point: Some(msg.first_per_commitment_point),
622
623                         their_prev_commitment_point: None,
624                         their_node_id: their_node_id,
625
626                         their_shutdown_scriptpubkey: None,
627
628                         channel_monitor: channel_monitor,
629
630                         logger,
631                 };
632
633                 let obscure_factor = chan.get_commitment_transaction_number_obscure_factor();
634                 chan.channel_monitor.set_commitment_obscure_factor(obscure_factor);
635
636                 Ok(chan)
637         }
638
639         // Utilities to derive keys:
640
641         fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
642                 let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, idx);
643                 SecretKey::from_slice(&self.secp_ctx, &res).unwrap()
644         }
645
646         // Utilities to build transactions:
647
648         fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
649                 let mut sha = Sha256::new();
650                 let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
651
652                 if self.channel_outbound {
653                         sha.input(&our_payment_basepoint.serialize());
654                         sha.input(&self.their_payment_basepoint.unwrap().serialize());
655                 } else {
656                         sha.input(&self.their_payment_basepoint.unwrap().serialize());
657                         sha.input(&our_payment_basepoint.serialize());
658                 }
659                 let mut res = [0; 32];
660                 sha.result(&mut res);
661
662                 ((res[26] as u64) << 5*8) |
663                 ((res[27] as u64) << 4*8) |
664                 ((res[28] as u64) << 3*8) |
665                 ((res[29] as u64) << 2*8) |
666                 ((res[30] as u64) << 1*8) |
667                 ((res[31] as u64) << 0*8)
668         }
669
670         /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
671         /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
672         /// the transaction. Thus, b will generally be sending a signature over such a transaction to
673         /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
674         /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
675         /// an HTLC to a).
676         /// @local is used only to convert relevant internal structures which refer to remote vs local
677         /// to decide value of outputs and direction of HTLCs.
678         /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
679         /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
680         /// have not yet committed it. Such HTLCs will only be included in transactions which are being
681         /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
682         /// which peer generated this transaction and "to whom" this transaction flows.
683         #[inline]
684         fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool) -> (Transaction, Vec<HTLCOutputInCommitment>) {
685                 let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ (0xffffffffffff - commitment_number);
686
687                 let txins = {
688                         let mut ins: Vec<TxIn> = Vec::new();
689                         ins.push(TxIn {
690                                 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
691                                 script_sig: Script::new(),
692                                 sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
693                                 witness: Vec::new(),
694                         });
695                         ins
696                 };
697
698                 let mut txouts: Vec<(TxOut, Option<HTLCOutputInCommitment>)> = Vec::with_capacity(self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len() + 2);
699
700                 let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
701                 let mut remote_htlc_total_msat = 0;
702                 let mut local_htlc_total_msat = 0;
703                 let mut value_to_self_msat_offset = 0;
704
705                 macro_rules! add_htlc_output {
706                         ($htlc: expr, $outbound: expr) => {
707                                 if $outbound == local { // "offered HTLC output"
708                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
709                                                 let htlc_in_tx = get_htlc_in_commitment!($htlc, true);
710                                                 txouts.push((TxOut {
711                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
712                                                         value: $htlc.amount_msat / 1000
713                                                 }, Some(htlc_in_tx)));
714                                         }
715                                 } else {
716                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (self.feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
717                                                 let htlc_in_tx = get_htlc_in_commitment!($htlc, false);
718                                                 txouts.push((TxOut { // "received HTLC output"
719                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
720                                                         value: $htlc.amount_msat / 1000
721                                                 }, Some(htlc_in_tx)));
722                                         }
723                                 }
724                         }
725                 }
726
727                 for ref htlc in self.pending_inbound_htlcs.iter() {
728                         let include = match htlc.state {
729                                 InboundHTLCState::RemoteAnnounced => !generated_by_local,
730                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce => !generated_by_local,
731                                 InboundHTLCState::AwaitingAnnouncedRemoteRevoke => true,
732                                 InboundHTLCState::Committed => true,
733                                 InboundHTLCState::LocalRemoved => !generated_by_local,
734                         };
735
736                         if include {
737                                 add_htlc_output!(htlc, false);
738                                 remote_htlc_total_msat += htlc.amount_msat;
739                         } else {
740                                 match htlc.state {
741                                         InboundHTLCState::LocalRemoved => {
742                                                 if generated_by_local && htlc.local_removed_fulfilled {
743                                                         value_to_self_msat_offset += htlc.amount_msat as i64;
744                                                 }
745                                         },
746                                         _ => {},
747                                 }
748                         }
749                 }
750
751                 for ref htlc in self.pending_outbound_htlcs.iter() {
752                         let include = match htlc.state {
753                                 OutboundHTLCState::LocalAnnounced => generated_by_local,
754                                 OutboundHTLCState::Committed => true,
755                                 OutboundHTLCState::RemoteRemoved => generated_by_local,
756                                 OutboundHTLCState::AwaitingRemoteRevokeToRemove => generated_by_local,
757                                 OutboundHTLCState::AwaitingRemovedRemoteRevoke => false,
758                         };
759
760                         if include {
761                                 add_htlc_output!(htlc, true);
762                                 local_htlc_total_msat += htlc.amount_msat;
763                         } else {
764                                 match htlc.state {
765                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove|OutboundHTLCState::AwaitingRemovedRemoteRevoke => {
766                                                 if htlc.fail_reason.is_none() {
767                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
768                                                 }
769                                         },
770                                         OutboundHTLCState::RemoteRemoved => {
771                                                 if !generated_by_local && htlc.fail_reason.is_none() {
772                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
773                                                 }
774                                         },
775                                         _ => {},
776                                 }
777                         }
778                 }
779
780                 let total_fee: u64 = self.feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
781                 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 };
782                 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 };
783
784                 let value_to_a = if local { value_to_self } else { value_to_remote };
785                 let value_to_b = if local { value_to_remote } else { value_to_self };
786
787                 if value_to_a >= (dust_limit_satoshis as i64) {
788                         txouts.push((TxOut {
789                                 script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
790                                                                                        if local { self.their_to_self_delay } else { BREAKDOWN_TIMEOUT },
791                                                                                        &keys.a_delayed_payment_key).to_v0_p2wsh(),
792                                 value: value_to_a as u64
793                         }, None));
794                 }
795
796                 if value_to_b >= (dust_limit_satoshis as i64) {
797                         txouts.push((TxOut {
798                                 script_pubkey: Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0)
799                                                              .push_slice(&Hash160::from_data(&keys.b_payment_key.serialize())[..])
800                                                              .into_script(),
801                                 value: value_to_b as u64
802                         }, None));
803                 }
804
805                 transaction_utils::sort_outputs(&mut txouts);
806
807                 let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
808                 let mut htlcs_used: Vec<HTLCOutputInCommitment> = Vec::with_capacity(txouts.len());
809                 for (idx, out) in txouts.drain(..).enumerate() {
810                         outputs.push(out.0);
811                         if let Some(out_htlc) = out.1 {
812                                 htlcs_used.push(out_htlc);
813                                 htlcs_used.last_mut().unwrap().transaction_output_index = idx as u32;
814                         }
815                 }
816
817                 (Transaction {
818                         version: 2,
819                         lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
820                         input: txins,
821                         output: outputs,
822                 }, htlcs_used)
823         }
824
825         #[inline]
826         fn get_closing_scriptpubkey(&self) -> Script {
827                 let our_channel_close_key_hash = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.channel_close_key).serialize());
828                 Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
829         }
830
831         #[inline]
832         fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
833                 (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)
834         }
835
836         #[inline]
837         fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
838                 let txins = {
839                         let mut ins: Vec<TxIn> = Vec::new();
840                         ins.push(TxIn {
841                                 previous_output: self.channel_monitor.get_funding_txo().unwrap().into_bitcoin_outpoint(),
842                                 script_sig: Script::new(),
843                                 sequence: 0xffffffff,
844                                 witness: Vec::new(),
845                         });
846                         ins
847                 };
848
849                 assert!(self.pending_inbound_htlcs.is_empty());
850                 assert!(self.pending_outbound_htlcs.is_empty());
851                 let mut txouts: Vec<(TxOut, ())> = Vec::new();
852
853                 let mut total_fee_satoshis = proposed_total_fee_satoshis;
854                 let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
855                 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 };
856
857                 if value_to_self < 0 {
858                         assert!(self.channel_outbound);
859                         total_fee_satoshis += (-value_to_self) as u64;
860                 } else if value_to_remote < 0 {
861                         assert!(!self.channel_outbound);
862                         total_fee_satoshis += (-value_to_remote) as u64;
863                 }
864
865                 if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
866                         txouts.push((TxOut {
867                                 script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
868                                 value: value_to_remote as u64
869                         }, ()));
870                 }
871
872                 if value_to_self as u64 > self.our_dust_limit_satoshis {
873                         txouts.push((TxOut {
874                                 script_pubkey: self.get_closing_scriptpubkey(),
875                                 value: value_to_self as u64
876                         }, ()));
877                 }
878
879                 transaction_utils::sort_outputs(&mut txouts);
880
881                 let mut outputs: Vec<TxOut> = Vec::new();
882                 for out in txouts.drain(..) {
883                         outputs.push(out.0);
884                 }
885
886                 (Transaction {
887                         version: 2,
888                         lock_time: 0,
889                         input: txins,
890                         output: outputs,
891                 }, total_fee_satoshis)
892         }
893
894         #[inline]
895         /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
896         /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
897         /// our counterparty!)
898         /// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
899         /// TODO Some magic rust shit to compile-time check this?
900         fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, HandleError> {
901                 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number));
902                 let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key);
903                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
904
905                 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()))
906         }
907
908         #[inline]
909         /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
910         /// will sign and send to our counterparty.
911         fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, HandleError> {
912                 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
913                 //may see payments to it!
914                 let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key);
915                 let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key);
916                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key);
917
918                 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()))
919         }
920
921         /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
922         /// pays to get_funding_redeemscript().to_v0_p2wsh()).
923         /// Panics if called before accept_channel/new_from_req
924         pub fn get_funding_redeemscript(&self) -> Script {
925                 let builder = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2);
926                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
927                 let their_funding_key = self.their_funding_pubkey.expect("get_funding_redeemscript only allowed after accept_channel").serialize();
928                 if our_funding_key[..] < their_funding_key[..] {
929                         builder.push_slice(&our_funding_key)
930                                 .push_slice(&their_funding_key)
931                 } else {
932                         builder.push_slice(&their_funding_key)
933                                 .push_slice(&our_funding_key)
934                 }.push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script()
935         }
936
937         fn sign_commitment_transaction(&self, tx: &mut Transaction, their_sig: &Signature) -> Signature {
938                 if tx.input.len() != 1 {
939                         panic!("Tried to sign commitment transaction that had input count != 1!");
940                 }
941                 if tx.input[0].witness.len() != 0 {
942                         panic!("Tried to re-sign commitment transaction");
943                 }
944
945                 let funding_redeemscript = self.get_funding_redeemscript();
946
947                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
948                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
949
950                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
951
952                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key).serialize();
953                 let their_funding_key = self.their_funding_pubkey.unwrap().serialize();
954                 if our_funding_key[..] < their_funding_key[..] {
955                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
956                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
957                 } else {
958                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
959                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
960                 }
961                 tx.input[0].witness[1].push(SigHashType::All as u8);
962                 tx.input[0].witness[2].push(SigHashType::All as u8);
963
964                 tx.input[0].witness.push(funding_redeemscript.into_bytes());
965
966                 our_sig
967         }
968
969         /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
970         /// @local is used only to convert relevant internal structures which refer to remote vs local
971         /// to decide value of outputs and direction of HTLCs.
972         fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys) -> Transaction {
973                 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)
974         }
975
976         fn create_htlc_tx_signature(&self, tx: &Transaction, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<(Script, Signature, bool), HandleError> {
977                 if tx.input.len() != 1 {
978                         panic!("Tried to sign HTLC transaction that had input count != 1!");
979                 }
980
981                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
982
983                 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());
984                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
985                 let is_local_tx = PublicKey::from_secret_key(&self.secp_ctx, &our_htlc_key) == keys.a_htlc_key;
986                 Ok((htlc_redeemscript, self.secp_ctx.sign(&sighash, &our_htlc_key), is_local_tx))
987         }
988
989         /// Signs a transaction created by build_htlc_transaction. If the transaction is an
990         /// HTLC-Success transaction (ie htlc.offered is false), preimate must be set!
991         fn sign_htlc_transaction(&self, tx: &mut Transaction, their_sig: &Signature, preimage: &Option<[u8; 32]>, htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Result<Signature, HandleError> {
992                 if tx.input.len() != 1 {
993                         panic!("Tried to sign HTLC transaction that had input count != 1!");
994                 }
995                 if tx.input[0].witness.len() != 0 {
996                         panic!("Tried to re-sign HTLC transaction");
997                 }
998
999                 let (htlc_redeemscript, our_sig, local_tx) = self.create_htlc_tx_signature(tx, htlc, keys)?;
1000
1001                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1002
1003                 if local_tx { // b, then a
1004                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1005                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1006                 } else {
1007                         tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1008                         tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1009                 }
1010                 tx.input[0].witness[1].push(SigHashType::All as u8);
1011                 tx.input[0].witness[2].push(SigHashType::All as u8);
1012
1013                 if htlc.offered {
1014                         tx.input[0].witness.push(Vec::new());
1015                 } else {
1016                         tx.input[0].witness.push(preimage.unwrap().to_vec());
1017                 }
1018
1019                 tx.input[0].witness.push(htlc_redeemscript.into_bytes());
1020
1021                 Ok(our_sig)
1022         }
1023
1024         fn get_update_fulfill_htlc(&mut self, htlc_id_arg: u64, payment_preimage_arg: [u8; 32]) -> Result<(Option<msgs::UpdateFulfillHTLC>, Option<ChannelMonitor>), HandleError> {
1025                 // Either ChannelFunded got set (which means it wont bet unset) or there is no way any
1026                 // caller thought we could have something claimed (cause we wouldn't have accepted in an
1027                 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
1028                 // either.
1029                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1030                         panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
1031                 }
1032                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1033
1034                 let mut sha = Sha256::new();
1035                 sha.input(&payment_preimage_arg);
1036                 let mut payment_hash_calc = [0; 32];
1037                 sha.result(&mut payment_hash_calc);
1038
1039                 let mut pending_idx = std::usize::MAX;
1040                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1041                         if htlc.htlc_id == htlc_id_arg {
1042                                 assert_eq!(htlc.payment_hash, payment_hash_calc);
1043                                 if htlc.state != InboundHTLCState::LocalRemoved {
1044                                         pending_idx = idx;
1045                                         break;
1046                                 }
1047                         }
1048                 }
1049                 if pending_idx == std::usize::MAX {
1050                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: None});
1051                 }
1052
1053                 // Now update local state:
1054                 //
1055                 // We have to put the payment_preimage in the channel_monitor right away here to ensure we
1056                 // can claim it even if the channel hits the chain before we see their next commitment.
1057                 self.channel_monitor.provide_payment_preimage(&payment_hash_calc, &payment_preimage_arg);
1058
1059                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
1060                         for pending_update in self.holding_cell_htlc_updates.iter() {
1061                                 match pending_update {
1062                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1063                                                 if htlc_id_arg == htlc_id {
1064                                                         return Ok((None, None));
1065                                                 }
1066                                         },
1067                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1068                                                 if htlc_id_arg == htlc_id {
1069                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: None});
1070                                                 }
1071                                         },
1072                                         _ => {}
1073                                 }
1074                         }
1075                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
1076                                 payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
1077                         });
1078                         return Ok((None, Some(self.channel_monitor.clone())));
1079                 }
1080
1081                 {
1082                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1083                         if htlc.state == InboundHTLCState::Committed {
1084                                 htlc.state = InboundHTLCState::LocalRemoved;
1085                                 htlc.local_removed_fulfilled = true;
1086                         } else if htlc.state == InboundHTLCState::RemoteAnnounced || htlc.state == InboundHTLCState::AwaitingRemoteRevokeToAnnounce || htlc.state == InboundHTLCState::AwaitingAnnouncedRemoteRevoke {
1087                                 // Theoretically we can hit this if we get the preimage on an HTLC prior to us
1088                                 // having forwarded it to anyone. This implies that the sender is busted as someone
1089                                 // else knows the preimage, but handling this case and implementing the logic to
1090                                 // take their money would be a lot of (never-tested) code to handle a case that
1091                                 // hopefully never happens. Instead, we make sure we get the preimage into the
1092                                 // channel_monitor and pretend we didn't just see the preimage.
1093                                 return Ok((None, Some(self.channel_monitor.clone())));
1094                         } else {
1095                                 // LocalRemoved handled in the search loop
1096                                 panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
1097                         }
1098                 }
1099
1100                 Ok((Some(msgs::UpdateFulfillHTLC {
1101                         channel_id: self.channel_id(),
1102                         htlc_id: htlc_id_arg,
1103                         payment_preimage: payment_preimage_arg,
1104                 }), Some(self.channel_monitor.clone())))
1105         }
1106
1107         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> {
1108                 match self.get_update_fulfill_htlc(htlc_id, payment_preimage)? {
1109                         (Some(update_fulfill_htlc), _) => {
1110                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1111                                 Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
1112                         },
1113                         (None, Some(channel_monitor)) => Ok((None, Some(channel_monitor))),
1114                         (None, None) => Ok((None, None))
1115                 }
1116         }
1117
1118         pub fn get_update_fail_htlc(&mut self, htlc_id_arg: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, HandleError> {
1119                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1120                         panic!("Was asked to fail an HTLC when channel was not in an operational state");
1121                 }
1122                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1123
1124                 // Now update local state:
1125                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
1126                         for pending_update in self.holding_cell_htlc_updates.iter() {
1127                                 match pending_update {
1128                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1129                                                 if htlc_id_arg == htlc_id {
1130                                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: None});
1131                                                 }
1132                                         },
1133                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1134                                                 if htlc_id_arg == htlc_id {
1135                                                         return Ok(None);
1136                                                 }
1137                                         },
1138                                         _ => {}
1139                                 }
1140                         }
1141                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1142                                 htlc_id: htlc_id_arg,
1143                                 err_packet,
1144                         });
1145                         return Ok(None);
1146                 }
1147
1148                 let mut htlc_amount_msat = 0;
1149                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1150                         if htlc.htlc_id == htlc_id_arg {
1151                                 if htlc.state == InboundHTLCState::Committed {
1152                                         htlc.state = InboundHTLCState::LocalRemoved;
1153                                 } else if htlc.state == InboundHTLCState::RemoteAnnounced {
1154                                         panic!("Somehow forwarded HTLC prior to remote revocation!");
1155                                 } else if htlc.state == InboundHTLCState::LocalRemoved {
1156                                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: None});
1157                                 } else {
1158                                         panic!("Have an inbound HTLC when not awaiting remote revoke that had a garbage state");
1159                                 }
1160                                 htlc_amount_msat += htlc.amount_msat;
1161                         }
1162                 }
1163                 if htlc_amount_msat == 0 {
1164                         return Err(HandleError{err: "Unable to find a pending HTLC which matched the given HTLC ID", action: None});
1165                 }
1166
1167                 Ok(Some(msgs::UpdateFailHTLC {
1168                         channel_id: self.channel_id(),
1169                         htlc_id: htlc_id_arg,
1170                         reason: err_packet
1171                 }))
1172         }
1173
1174         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> {
1175                 match self.get_update_fail_htlc(htlc_id, err_packet)? {
1176                         Some(update_fail_htlc) => {
1177                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1178                                 Ok(Some((update_fail_htlc, commitment, monitor_update)))
1179                         },
1180                         None => Ok(None)
1181                 }
1182         }
1183
1184         // Message handlers:
1185
1186         pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1187                 macro_rules! return_error_message {
1188                         ( $msg: expr ) => {
1189                                 return Err(HandleError{err: $msg, action: Some(msgs::ErrorAction::SendErrorMessage{ msg: msgs::ErrorMessage { channel_id: msg.temporary_channel_id, data: $msg.to_string() }})});
1190                         }
1191                 }
1192                 // Check sanity of message fields:
1193                 if !self.channel_outbound {
1194                         return_error_message!("Got an accept_channel message from an inbound peer");
1195                 }
1196                 if self.channel_state != ChannelState::OurInitSent as u32 {
1197                         return_error_message!("Got an accept_channel message at a strange time");
1198                 }
1199                 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1200                         return_error_message!("Peer never wants payout outputs?");
1201                 }
1202                 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1203                         return_error_message!("Bogus channel_reserve_satoshis");
1204                 }
1205                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
1206                         return_error_message!("Bogus channel_reserve and dust_limit");
1207                 }
1208                 if msg.channel_reserve_satoshis < self.our_dust_limit_satoshis {
1209                         return_error_message!("Peer never wants payout outputs?");
1210                 }
1211                 if msg.dust_limit_satoshis > Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis) {
1212                         return_error_message!("Dust limit is bigger than our channel reverse");
1213                 }
1214                 if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
1215                         return_error_message!("Minimum htlc value is full channel value");
1216                 }
1217                 if msg.minimum_depth > Channel::derive_maximum_minimum_depth(self.channel_value_satoshis*1000,  self.value_to_self_msat) {
1218                         return_error_message!("minimum_depth too large");
1219                 }
1220                 if msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
1221                         return_error_message!("They wanted our payments to be delayed by a needlessly long period");
1222                 }
1223                 if msg.max_accepted_htlcs < 1 {
1224                         return_error_message!("0 max_accpted_htlcs makes for a useless channel");
1225                 }
1226                 if msg.max_accepted_htlcs > 483 {
1227                         return_error_message!("max_accpted_htlcs > 483");
1228                 }
1229
1230                 // TODO: Optional additional constraints mentioned in the spec
1231                 // MAY fail the channel if
1232                 // funding_satoshi is too small
1233                 // htlc_minimum_msat too large
1234                 // max_htlc_value_in_flight_msat too small
1235                 // channel_reserve_satoshis too large
1236                 // max_accepted_htlcs too small
1237                 // dust_limit_satoshis too small
1238
1239                 self.channel_monitor.set_their_base_keys(&msg.htlc_basepoint, &msg.delayed_payment_basepoint);
1240
1241                 self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
1242                 self.their_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
1243                 self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
1244                 self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
1245                 self.their_to_self_delay = msg.to_self_delay;
1246                 self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
1247                 self.their_funding_pubkey = Some(msg.funding_pubkey);
1248                 self.their_revocation_basepoint = Some(msg.revocation_basepoint);
1249                 self.their_payment_basepoint = Some(msg.payment_basepoint);
1250                 self.their_delayed_payment_basepoint = Some(msg.delayed_payment_basepoint);
1251                 self.their_htlc_basepoint = Some(msg.htlc_basepoint);
1252                 self.their_cur_commitment_point = Some(msg.first_per_commitment_point);
1253
1254                 let obscure_factor = self.get_commitment_transaction_number_obscure_factor();
1255                 self.channel_monitor.set_commitment_obscure_factor(obscure_factor);
1256                 self.channel_monitor.set_their_to_self_delay(msg.to_self_delay);
1257
1258                 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1259
1260                 Ok(())
1261         }
1262
1263         fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, Signature), HandleError> {
1264                 let funding_script = self.get_funding_redeemscript();
1265
1266                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1267                 let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
1268                 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();
1269
1270                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1271                 secp_call!(self.secp_ctx.verify(&local_sighash, &sig, &self.their_funding_pubkey.unwrap()), "Invalid funding_created signature from peer", self.channel_id());
1272
1273                 let remote_keys = self.build_remote_transaction_keys()?;
1274                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
1275                 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();
1276
1277                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
1278                 Ok((remote_initial_commitment_tx, self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key)))
1279         }
1280
1281         pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor), HandleError> {
1282                 if self.channel_outbound {
1283                         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()}})});
1284                 }
1285                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1286                         // BOLT 2 says that if we disconnect before we send funding_signed we SHOULD NOT
1287                         // remember the channel, so its safe to just send an error_message here and drop the
1288                         // channel.
1289                         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()}})});
1290                 }
1291                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
1292                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1293                 }
1294
1295                 let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
1296                 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
1297                 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
1298
1299                 let (remote_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
1300                         Ok(res) => res,
1301                         Err(e) => {
1302                                 self.channel_monitor.unset_funding_info();
1303                                 return Err(e);
1304                         }
1305                 };
1306
1307                 // Now that we're past error-generating stuff, update our local state:
1308
1309                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
1310                 self.channel_state = ChannelState::FundingSent as u32;
1311                 self.channel_id = funding_txo.to_channel_id();
1312                 self.cur_remote_commitment_transaction_number -= 1;
1313                 self.cur_local_commitment_transaction_number -= 1;
1314
1315                 Ok((msgs::FundingSigned {
1316                         channel_id: self.channel_id,
1317                         signature: our_signature
1318                 }, self.channel_monitor.clone()))
1319         }
1320
1321         /// Handles a funding_signed message from the remote end.
1322         /// If this call is successful, broadcast the funding transaction (and not before!)
1323         pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitor, HandleError> {
1324                 if !self.channel_outbound {
1325                         return Err(HandleError{err: "Received funding_signed for an inbound channel?", action: None});
1326                 }
1327                 if self.channel_state != ChannelState::FundingCreated as u32 {
1328                         return Err(HandleError{err: "Received funding_signed in strange state!", action: None});
1329                 }
1330                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 2 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
1331                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1332                 }
1333
1334                 let funding_script = self.get_funding_redeemscript();
1335
1336                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1337                 let mut local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false).0;
1338                 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();
1339
1340                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1341                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid funding_signed signature from peer", self.channel_id());
1342
1343                 self.sign_commitment_transaction(&mut local_initial_commitment_tx, &msg.signature);
1344                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), local_keys, self.feerate_per_kw, Vec::new());
1345                 self.last_local_commitment_txn = vec![local_initial_commitment_tx];
1346                 self.channel_state = ChannelState::FundingSent as u32;
1347                 self.cur_local_commitment_transaction_number -= 1;
1348
1349                 Ok(self.channel_monitor.clone())
1350         }
1351
1352         pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), HandleError> {
1353                 let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
1354                 if non_shutdown_state == ChannelState::FundingSent as u32 {
1355                         self.channel_state |= ChannelState::TheirFundingLocked as u32;
1356                 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1357                         self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
1358                         self.channel_update_count += 1;
1359                 } else {
1360                         return Err(HandleError{err: "Peer sent a funding_locked at a strange time", action: None});
1361                 }
1362
1363                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1364                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1365                 Ok(())
1366         }
1367
1368         /// Returns (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
1369         /// If its for a remote update check, we need to be more lax about checking against messages we
1370         /// sent but they may not have received/processed before they sent this message. Further, for
1371         /// our own sends, we're more conservative and even consider things they've removed against
1372         /// totals, though there is little reason to outside of further avoiding any race condition
1373         /// issues.
1374         fn get_pending_htlc_stats(&self, for_remote_update_check: bool) -> (u32, u32, u64, u64) {
1375                 //TODO: Can probably split this into inbound/outbound
1376                 let mut inbound_htlc_count: u32 = 0;
1377                 let mut outbound_htlc_count: u32 = 0;
1378                 let mut htlc_outbound_value_msat = 0;
1379                 let mut htlc_inbound_value_msat = 0;
1380                 for ref htlc in self.pending_inbound_htlcs.iter() {
1381                         match htlc.state {
1382                                 InboundHTLCState::RemoteAnnounced => {},
1383                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce => {},
1384                                 InboundHTLCState::AwaitingAnnouncedRemoteRevoke => {},
1385                                 InboundHTLCState::Committed => {},
1386                                 InboundHTLCState::LocalRemoved => {},
1387                         }
1388                         inbound_htlc_count += 1;
1389                         htlc_inbound_value_msat += htlc.amount_msat;
1390                 }
1391                 for ref htlc in self.pending_outbound_htlcs.iter() {
1392                         match htlc.state {
1393                                 OutboundHTLCState::LocalAnnounced => { if for_remote_update_check { continue; } },
1394                                 OutboundHTLCState::Committed => {},
1395                                 OutboundHTLCState::RemoteRemoved => { if for_remote_update_check { continue; } },
1396                                 OutboundHTLCState::AwaitingRemoteRevokeToRemove => { if for_remote_update_check { continue; } },
1397                                 OutboundHTLCState::AwaitingRemovedRemoteRevoke => { if for_remote_update_check { continue; } },
1398                         }
1399                         outbound_htlc_count += 1;
1400                         htlc_outbound_value_msat += htlc.amount_msat;
1401                 }
1402
1403                 (inbound_htlc_count, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat)
1404         }
1405
1406         pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingHTLCStatus) -> Result<(), HandleError> {
1407                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
1408                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1409                 }
1410                 if msg.amount_msat > self.channel_value_satoshis * 1000 {
1411                         return Err(HandleError{err: "Remote side tried to send more than the total value of the channel", action: None});
1412                 }
1413                 if msg.amount_msat < self.our_htlc_minimum_msat {
1414                         return Err(HandleError{err: "Remote side tried to send less than our minimum HTLC value", action: None});
1415                 }
1416
1417                 let (inbound_htlc_count, _, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(true);
1418                 if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
1419                         return Err(HandleError{err: "Remote tried to push more than our max accepted HTLCs", action: None});
1420                 }
1421                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
1422                 // Check our_max_htlc_value_in_flight_msat
1423                 if htlc_inbound_value_msat + msg.amount_msat > Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
1424                         return Err(HandleError{err: "Remote HTLC add would put them over their max HTLC value in flight", action: None});
1425                 }
1426                 // Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
1427                 // the reserve_satoshis we told them to always have as direct payment so that they lose
1428                 // something if we punish them for broadcasting an old state).
1429                 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 {
1430                         return Err(HandleError{err: "Remote HTLC add would put them over their reserve value", action: None});
1431                 }
1432                 if self.next_remote_htlc_id != msg.htlc_id {
1433                         return Err(HandleError{err: "Remote skipped HTLC ID", action: None});
1434                 }
1435                 if msg.cltv_expiry >= 500000000 {
1436                         return Err(HandleError{err: "Remote provided CLTV expiry in seconds instead of block height", action: None});
1437                 }
1438
1439                 //TODO: Check msg.cltv_expiry further? Do this in channel manager?
1440
1441                 // Now update local state:
1442                 self.next_remote_htlc_id += 1;
1443                 self.pending_inbound_htlcs.push(InboundHTLCOutput {
1444                         htlc_id: msg.htlc_id,
1445                         amount_msat: msg.amount_msat,
1446                         payment_hash: msg.payment_hash,
1447                         cltv_expiry: msg.cltv_expiry,
1448                         state: InboundHTLCState::RemoteAnnounced,
1449                         local_removed_fulfilled: false,
1450                         pending_forward_state: Some(pending_forward_state),
1451                 });
1452
1453                 Ok(())
1454         }
1455
1456         /// Removes an outbound HTLC which has been commitment_signed by the remote end
1457         #[inline]
1458         fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<[u8; 32]>, fail_reason: Option<HTLCFailReason>) -> Result<&HTLCSource, HandleError> {
1459                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1460                         if htlc.htlc_id == htlc_id {
1461                                 match check_preimage {
1462                                         None => {},
1463                                         Some(payment_hash) =>
1464                                                 if payment_hash != htlc.payment_hash {
1465                                                         return Err(HandleError{err: "Remote tried to fulfill HTLC with an incorrect preimage", action: None});
1466                                                 }
1467                                 };
1468                                 match htlc.state {
1469                                         OutboundHTLCState::LocalAnnounced =>
1470                                                 return Err(HandleError{err: "Remote tried to fulfill HTLC before it had been committed", action: None}),
1471                                         OutboundHTLCState::Committed => {
1472                                                 htlc.state = OutboundHTLCState::RemoteRemoved;
1473                                                 htlc.fail_reason = fail_reason;
1474                                         },
1475                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove | OutboundHTLCState::AwaitingRemovedRemoteRevoke | OutboundHTLCState::RemoteRemoved =>
1476                                                 return Err(HandleError{err: "Remote tried to fulfill HTLC that they'd already fulfilled", action: None}),
1477                                 }
1478                                 return Ok(&htlc.source);
1479                         }
1480                 }
1481                 Err(HandleError{err: "Remote tried to fulfill/fail an HTLC we couldn't find", action: None})
1482         }
1483
1484         pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<&HTLCSource, HandleError> {
1485                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1486                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1487                 }
1488
1489                 let mut sha = Sha256::new();
1490                 sha.input(&msg.payment_preimage);
1491                 let mut payment_hash = [0; 32];
1492                 sha.result(&mut payment_hash);
1493
1494                 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None)
1495         }
1496
1497         pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<&HTLCSource, HandleError> {
1498                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1499                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1500                 }
1501
1502                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1503         }
1504
1505         pub fn update_fail_malformed_htlc<'a>(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<&HTLCSource, HandleError> {
1506                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1507                         return Err(HandleError{err: "Got add HTLC message when channel was not in an operational state", action: None});
1508                 }
1509
1510                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))
1511         }
1512
1513         pub fn commitment_signed(&mut self, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, ChannelMonitor), HandleError> {
1514                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1515                         return Err(HandleError{err: "Got commitment signed message when channel was not in an operational state", action: None});
1516                 }
1517
1518                 let funding_script = self.get_funding_redeemscript();
1519
1520                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1521                 let mut local_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false);
1522                 let local_commitment_txid = local_commitment_tx.0.txid();
1523                 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();
1524                 secp_call!(self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid commitment tx signature from peer", self.channel_id());
1525
1526                 if msg.htlc_signatures.len() != local_commitment_tx.1.len() {
1527                         return Err(HandleError{err: "Got wrong number of HTLC signatures from remote", action: None});
1528                 }
1529
1530                 let mut new_local_commitment_txn = Vec::with_capacity(local_commitment_tx.1.len() + 1);
1531                 self.sign_commitment_transaction(&mut local_commitment_tx.0, &msg.signature);
1532                 new_local_commitment_txn.push(local_commitment_tx.0.clone());
1533
1534                 let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.1.len());
1535                 for (idx, ref htlc) in local_commitment_tx.1.iter().enumerate() {
1536                         let mut htlc_tx = self.build_htlc_transaction(&local_commitment_txid, htlc, true, &local_keys);
1537                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
1538                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
1539                         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());
1540                         let htlc_sig = if htlc.offered {
1541                                 let htlc_sig = self.sign_htlc_transaction(&mut htlc_tx, &msg.htlc_signatures[idx], &None, htlc, &local_keys)?;
1542                                 new_local_commitment_txn.push(htlc_tx);
1543                                 htlc_sig
1544                         } else {
1545                                 self.create_htlc_tx_signature(&htlc_tx, htlc, &local_keys)?.1
1546                         };
1547                         htlcs_and_sigs.push(((*htlc).clone(), msg.htlc_signatures[idx], htlc_sig));
1548                 }
1549
1550                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1));
1551                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed, self.cur_local_commitment_transaction_number + 1);
1552
1553                 // Update state now that we've passed all the can-fail calls...
1554                 self.channel_monitor.provide_latest_local_commitment_tx_info(local_commitment_tx.0, local_keys, self.feerate_per_kw, htlcs_and_sigs);
1555
1556                 let mut need_our_commitment = false;
1557                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1558                         if htlc.state == InboundHTLCState::RemoteAnnounced {
1559                                 htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce;
1560                                 need_our_commitment = true;
1561                         }
1562                 }
1563                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1564                         if htlc.state == OutboundHTLCState::RemoteRemoved {
1565                                 htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove;
1566                                 need_our_commitment = true;
1567                         }
1568                 }
1569
1570                 self.cur_local_commitment_transaction_number -= 1;
1571                 self.last_local_commitment_txn = new_local_commitment_txn;
1572
1573                 let (our_commitment_signed, monitor_update) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1574                         // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
1575                         // we'll send one right away when we get the revoke_and_ack when we
1576                         // free_holding_cell_htlcs().
1577                         let (msg, monitor) = self.send_commitment_no_status_check()?;
1578                         (Some(msg), monitor)
1579                 } else { (None, self.channel_monitor.clone()) };
1580
1581                 Ok((msgs::RevokeAndACK {
1582                         channel_id: self.channel_id,
1583                         per_commitment_secret: per_commitment_secret,
1584                         next_per_commitment_point: next_per_commitment_point,
1585                 }, our_commitment_signed, monitor_update))
1586         }
1587
1588         /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
1589         /// fulfilling or failing the last pending HTLC)
1590         fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitor)>, HandleError> {
1591                 if self.holding_cell_htlc_updates.len() != 0 {
1592                         let mut htlc_updates = Vec::new();
1593                         mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
1594                         let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
1595                         let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
1596                         let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
1597                         let mut err = None;
1598                         for htlc_update in htlc_updates.drain(..) {
1599                                 // Note that this *can* fail, though it should be due to rather-rare conditions on
1600                                 // fee races with adding too many outputs which push our total payments just over
1601                                 // the limit. In case its less rare than I anticipate, we may want to revisit
1602                                 // handling this case better and maybe fufilling some of the HTLCs while attempting
1603                                 // to rebalance channels.
1604                                 if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
1605                                         self.holding_cell_htlc_updates.push(htlc_update);
1606                                 } else {
1607                                         match &htlc_update {
1608                                                 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, payment_hash, ref source, ref onion_routing_packet, ..} => {
1609                                                         match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone()) {
1610                                                                 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
1611                                                                 Err(e) => {
1612                                                                         err = Some(e);
1613                                                                 }
1614                                                         }
1615                                                 },
1616                                                 &HTLCUpdateAwaitingACK::ClaimHTLC { payment_preimage, htlc_id, .. } => {
1617                                                         match self.get_update_fulfill_htlc(htlc_id, payment_preimage) {
1618                                                                 Ok(update_fulfill_msg_option) => update_fulfill_htlcs.push(update_fulfill_msg_option.0.unwrap()),
1619                                                                 Err(e) => {
1620                                                                         err = Some(e);
1621                                                                 }
1622                                                         }
1623                                                 },
1624                                                 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
1625                                                         match self.get_update_fail_htlc(htlc_id, err_packet.clone()) {
1626                                                                 Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
1627                                                                 Err(e) => {
1628                                                                         err = Some(e);
1629                                                                 }
1630                                                         }
1631                                                 },
1632                                         }
1633                                         if err.is_some() {
1634                                                 self.holding_cell_htlc_updates.push(htlc_update);
1635                                         }
1636                                 }
1637                         }
1638                         //TODO: Need to examine the type of err - if its a fee issue or similar we may want to
1639                         //fail it back the route, if its a temporary issue we can ignore it...
1640                         match err {
1641                                 None => {
1642                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1643                                         Ok(Some((msgs::CommitmentUpdate {
1644                                                 update_add_htlcs,
1645                                                 update_fulfill_htlcs,
1646                                                 update_fail_htlcs,
1647                                                 update_fail_malformed_htlcs: Vec::new(),
1648                                                 commitment_signed,
1649                                         }, monitor_update)))
1650                                 },
1651                                 Some(e) => Err(e)
1652                         }
1653                 } else {
1654                         Ok(None)
1655                 }
1656         }
1657
1658         /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
1659         /// commitment_signed message here in case we had pending outbound HTLCs to add which were
1660         /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
1661         /// generating an appropriate error *after* the channel state has been updated based on the
1662         /// revoke_and_ack message.
1663         pub fn revoke_and_ack(&mut self, msg: &msgs::RevokeAndACK) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingForwardHTLCInfo, u64)>, Vec<(HTLCSource, [u8; 32], HTLCFailReason)>, ChannelMonitor), HandleError> {
1664                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1665                         return Err(HandleError{err: "Got revoke/ACK message when channel was not in an operational state", action: None});
1666                 }
1667                 if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
1668                         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 {
1669                                 return Err(HandleError{err: "Got a revoke commitment secret which didn't correspond to their current pubkey", action: None});
1670                         }
1671                 }
1672                 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)))?;
1673
1674                 // Update state now that we've passed all the can-fail calls...
1675                 // (note that we may still fail to generate the new commitment_signed message, but that's
1676                 // OK, we step the channel here and *then* if the new generation fails we can fail the
1677                 // channel based on that, but stepping stuff here should be safe either way.
1678                 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
1679                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1680                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1681                 self.cur_remote_commitment_transaction_number -= 1;
1682
1683                 let mut to_forward_infos = Vec::new();
1684                 let mut revoked_htlcs = Vec::new();
1685                 let mut update_fail_htlcs = Vec::new();
1686                 let mut update_fail_malformed_htlcs = Vec::new();
1687                 let mut require_commitment = false;
1688                 let mut value_to_self_msat_diff: i64 = 0;
1689                 // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
1690                 self.pending_inbound_htlcs.retain(|htlc| {
1691                         if htlc.state == InboundHTLCState::LocalRemoved {
1692                                 if htlc.local_removed_fulfilled {
1693                                         value_to_self_msat_diff += htlc.amount_msat as i64;
1694                                 }
1695                                 false
1696                         } else { true }
1697                 });
1698                 self.pending_outbound_htlcs.retain(|htlc| {
1699                         if htlc.state == OutboundHTLCState::AwaitingRemovedRemoteRevoke {
1700                                 if let Some(reason) = htlc.fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
1701                                         revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
1702                                 } else {
1703                                         // They fulfilled, so we sent them money
1704                                         value_to_self_msat_diff -= htlc.amount_msat as i64;
1705                                 }
1706                                 false
1707                         } else { true }
1708                 });
1709                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1710                         if htlc.state == InboundHTLCState::AwaitingRemoteRevokeToAnnounce {
1711                                 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke;
1712                                 require_commitment = true;
1713                         } else if htlc.state == InboundHTLCState::AwaitingAnnouncedRemoteRevoke {
1714                                 match htlc.pending_forward_state.take().unwrap() {
1715                                         PendingHTLCStatus::Fail(fail_msg) => {
1716                                                 htlc.state = InboundHTLCState::LocalRemoved;
1717                                                 require_commitment = true;
1718                                                 match fail_msg {
1719                                                         HTLCFailureMsg::Relay(msg) => update_fail_htlcs.push(msg),
1720                                                         HTLCFailureMsg::Malformed(msg) => update_fail_malformed_htlcs.push(msg),
1721                                                 }
1722                                         },
1723                                         PendingHTLCStatus::Forward(forward_info) => {
1724                                                 to_forward_infos.push((forward_info, htlc.htlc_id));
1725                                                 htlc.state = InboundHTLCState::Committed;
1726                                         }
1727                                 }
1728                         }
1729                 }
1730                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1731                         if htlc.state == OutboundHTLCState::LocalAnnounced {
1732                                 htlc.state = OutboundHTLCState::Committed;
1733                         } else if htlc.state == OutboundHTLCState::AwaitingRemoteRevokeToRemove {
1734                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
1735                                 require_commitment = true;
1736                         }
1737                 }
1738                 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
1739
1740                 match self.free_holding_cell_htlcs()? {
1741                         Some(mut commitment_update) => {
1742                                 commitment_update.0.update_fail_htlcs.reserve(update_fail_htlcs.len());
1743                                 for fail_msg in update_fail_htlcs.drain(..) {
1744                                         commitment_update.0.update_fail_htlcs.push(fail_msg);
1745                                 }
1746                                 commitment_update.0.update_fail_malformed_htlcs.reserve(update_fail_malformed_htlcs.len());
1747                                 for fail_msg in update_fail_malformed_htlcs.drain(..) {
1748                                         commitment_update.0.update_fail_malformed_htlcs.push(fail_msg);
1749                                 }
1750                                 Ok((Some(commitment_update.0), to_forward_infos, revoked_htlcs, commitment_update.1))
1751                         },
1752                         None => {
1753                                 if require_commitment {
1754                                         let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
1755                                         Ok((Some(msgs::CommitmentUpdate {
1756                                                 update_add_htlcs: Vec::new(),
1757                                                 update_fulfill_htlcs: Vec::new(),
1758                                                 update_fail_htlcs,
1759                                                 update_fail_malformed_htlcs,
1760                                                 commitment_signed
1761                                         }), to_forward_infos, revoked_htlcs, monitor_update))
1762                                 } else {
1763                                         Ok((None, to_forward_infos, revoked_htlcs, self.channel_monitor.clone()))
1764                                 }
1765                         }
1766                 }
1767         }
1768
1769         pub fn update_fee(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1770                 if self.channel_outbound {
1771                         return Err(HandleError{err: "Non-funding remote tried to update channel fee", action: None});
1772                 }
1773                 Channel::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
1774                 self.channel_update_count += 1;
1775                 self.feerate_per_kw = msg.feerate_per_kw as u64;
1776                 Ok(())
1777         }
1778
1779         pub fn shutdown(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, [u8; 32])>), HandleError> {
1780                 if self.channel_state < ChannelState::FundingSent as u32 {
1781                         self.channel_state = ChannelState::ShutdownComplete as u32;
1782                         self.channel_update_count += 1;
1783                         return Ok((None, None, Vec::new()));
1784                 }
1785                 for htlc in self.pending_inbound_htlcs.iter() {
1786                         if htlc.state == InboundHTLCState::RemoteAnnounced {
1787                                 return Err(HandleError{err: "Got shutdown with remote pending HTLCs", action: None});
1788                         }
1789                 }
1790                 if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
1791                         return Err(HandleError{err: "Remote peer sent duplicate shutdown message", action: None});
1792                 }
1793                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1794
1795                 // BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
1796                 // 34 bytes in length, so dont let the remote peer feed us some super fee-heavy script.
1797                 if self.channel_outbound && msg.scriptpubkey.len() > 34 {
1798                         return Err(HandleError{err: "Got shutdown_scriptpubkey of absurd length from remote peer", action: None});
1799                 }
1800                 //TODO: Check shutdown_scriptpubkey form as BOLT says we must? WHYYY
1801
1802                 if self.their_shutdown_scriptpubkey.is_some() {
1803                         if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
1804                                 return Err(HandleError{err: "Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey", action: None});
1805                         }
1806                 } else {
1807                         self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
1808                 }
1809
1810                 let our_closing_script = self.get_closing_scriptpubkey();
1811
1812                 let (proposed_feerate, proposed_fee, our_sig) = if self.channel_outbound && self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() {
1813                         let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
1814                         if self.feerate_per_kw > proposed_feerate {
1815                                 proposed_feerate = self.feerate_per_kw;
1816                         }
1817                         let tx_weight = Self::get_closing_transaction_weight(&our_closing_script, &msg.scriptpubkey);
1818                         let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 1000;
1819
1820                         let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
1821                         let funding_redeemscript = self.get_funding_redeemscript();
1822                         let sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1823
1824                         (Some(proposed_feerate), Some(total_fee_satoshis), Some(self.secp_ctx.sign(&sighash, &self.local_keys.funding_key)))
1825                 } else { (None, None, None) };
1826
1827                 // From here on out, we may not fail!
1828
1829                 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
1830                 self.channel_update_count += 1;
1831
1832                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
1833                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
1834                 // cell HTLCs and return them to fail the payment.
1835                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
1836                 self.holding_cell_htlc_updates.retain(|htlc_update| {
1837                         match htlc_update {
1838                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
1839                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
1840                                         false
1841                                 },
1842                                 _ => true
1843                         }
1844                 });
1845                 for htlc in self.pending_outbound_htlcs.iter() {
1846                         if htlc.state == OutboundHTLCState::LocalAnnounced {
1847                                 return Ok((None, None, dropped_outbound_htlcs));
1848                         }
1849                 }
1850
1851                 let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
1852                         None
1853                 } else {
1854                         Some(msgs::Shutdown {
1855                                 channel_id: self.channel_id,
1856                                 scriptpubkey: our_closing_script,
1857                         })
1858                 };
1859
1860                 self.channel_state |= ChannelState::LocalShutdownSent as u32;
1861                 self.channel_update_count += 1;
1862                 if self.pending_inbound_htlcs.is_empty() && self.pending_outbound_htlcs.is_empty() && self.channel_outbound {
1863                         // There are no more HTLCs and we're the funder, this means we start the closing_signed
1864                         // dance with an initial fee proposal!
1865                         self.last_sent_closing_fee = Some((proposed_feerate.unwrap(), proposed_fee.unwrap()));
1866                         Ok((our_shutdown, Some(msgs::ClosingSigned {
1867                                 channel_id: self.channel_id,
1868                                 fee_satoshis: proposed_fee.unwrap(),
1869                                 signature: our_sig.unwrap(),
1870                         }), dropped_outbound_htlcs))
1871                 } else {
1872                         Ok((our_shutdown, None, dropped_outbound_htlcs))
1873                 }
1874         }
1875
1876         pub fn closing_signed(&mut self, fee_estimator: &FeeEstimator, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), HandleError> {
1877                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
1878                         return Err(HandleError{err: "Remote end sent us a closing_signed before both sides provided a shutdown", action: None});
1879                 }
1880                 if !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() {
1881                         return Err(HandleError{err: "Remote end sent us a closing_signed while there were still pending HTLCs", action: None});
1882                 }
1883                 if msg.fee_satoshis > 21000000 * 10000000 {
1884                         return Err(HandleError{err: "Remote tried to send us a closing tx with > 21 million BTC fee", action: None});
1885                 }
1886
1887                 let funding_redeemscript = self.get_funding_redeemscript();
1888                 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
1889                 if used_total_fee != msg.fee_satoshis {
1890                         return Err(HandleError{err: "Remote sent us a closing_signed with a fee greater than the value they can claim", action: None});
1891                 }
1892                 let mut sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1893
1894                 match self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()) {
1895                         Ok(_) => {},
1896                         Err(_e) => {
1897                                 // The remote end may have decided to revoke their output due to inconsistent dust
1898                                 // limits, so check for that case by re-checking the signature here.
1899                                 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
1900                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1901                                 secp_call!(self.secp_ctx.verify(&sighash, &msg.signature, &self.their_funding_pubkey.unwrap()), "Invalid closing tx signature from peer", self.channel_id());
1902                         },
1903                 };
1904
1905                 if let Some((_, last_fee)) = self.last_sent_closing_fee {
1906                         if last_fee == msg.fee_satoshis {
1907                                 self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
1908                                 self.channel_state = ChannelState::ShutdownComplete as u32;
1909                                 self.channel_update_count += 1;
1910                                 return Ok((None, Some(closing_tx)));
1911                         }
1912                 }
1913
1914                 macro_rules! propose_new_feerate {
1915                         ($new_feerate: expr) => {
1916                                 let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
1917                                 let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 1000, false);
1918                                 sighash = Message::from_slice(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]).unwrap();
1919                                 let our_sig = self.secp_ctx.sign(&sighash, &self.local_keys.funding_key);
1920                                 self.last_sent_closing_fee = Some(($new_feerate, used_total_fee));
1921                                 return Ok((Some(msgs::ClosingSigned {
1922                                         channel_id: self.channel_id,
1923                                         fee_satoshis: used_total_fee,
1924                                         signature: our_sig,
1925                                 }), None))
1926                         }
1927                 }
1928
1929                 let proposed_sat_per_kw = msg.fee_satoshis * 1000 / closing_tx.get_weight();
1930                 if self.channel_outbound {
1931                         let our_max_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
1932                         if proposed_sat_per_kw > our_max_feerate {
1933                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
1934                                         if our_max_feerate <= last_feerate {
1935                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate", action: None});
1936                                         }
1937                                 }
1938                                 propose_new_feerate!(our_max_feerate);
1939                         }
1940                 } else {
1941                         let our_min_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
1942                         if proposed_sat_per_kw < our_min_feerate {
1943                                 if let Some((last_feerate, _)) = self.last_sent_closing_fee {
1944                                         if our_min_feerate >= last_feerate {
1945                                                 return Err(HandleError{err: "Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate", action: None});
1946                                         }
1947                                 }
1948                                 propose_new_feerate!(our_min_feerate);
1949                         }
1950                 }
1951
1952                 let our_sig = self.sign_commitment_transaction(&mut closing_tx, &msg.signature);
1953                 self.channel_state = ChannelState::ShutdownComplete as u32;
1954                 self.channel_update_count += 1;
1955
1956                 Ok((Some(msgs::ClosingSigned {
1957                         channel_id: self.channel_id,
1958                         fee_satoshis: msg.fee_satoshis,
1959                         signature: our_sig,
1960                 }), Some(closing_tx)))
1961         }
1962
1963         // Public utilities:
1964
1965         pub fn channel_id(&self) -> [u8; 32] {
1966                 self.channel_id
1967         }
1968
1969         /// Gets the "user_id" value passed into the construction of this channel. It has no special
1970         /// meaning and exists only to allow users to have a persistent identifier of a channel.
1971         pub fn get_user_id(&self) -> u64 {
1972                 self.user_id
1973         }
1974
1975         /// May only be called after funding has been initiated (ie is_funding_initiated() is true)
1976         pub fn channel_monitor(&self) -> ChannelMonitor {
1977                 if self.channel_state < ChannelState::FundingCreated as u32 {
1978                         panic!("Can't get a channel monitor until funding has been created");
1979                 }
1980                 self.channel_monitor.clone()
1981         }
1982
1983         /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
1984         /// is_usable() returns true).
1985         /// Allowed in any state (including after shutdown)
1986         pub fn get_short_channel_id(&self) -> Option<u64> {
1987                 self.short_channel_id
1988         }
1989
1990         /// Returns the funding_txo we either got from our peer, or were given by
1991         /// get_outbound_funding_created.
1992         pub fn get_funding_txo(&self) -> Option<OutPoint> {
1993                 self.channel_monitor.get_funding_txo()
1994         }
1995
1996         /// Allowed in any state (including after shutdown)
1997         pub fn get_their_node_id(&self) -> PublicKey {
1998                 self.their_node_id
1999         }
2000
2001         /// Allowed in any state (including after shutdown)
2002         pub fn get_our_htlc_minimum_msat(&self) -> u64 {
2003                 self.our_htlc_minimum_msat
2004         }
2005
2006         pub fn get_value_satoshis(&self) -> u64 {
2007                 self.channel_value_satoshis
2008         }
2009
2010         //TODO: Testing purpose only, should be changed in another way after #81
2011         #[cfg(test)]
2012         pub fn get_local_keys(&self) -> &ChannelKeys {
2013                 &self.local_keys
2014         }
2015
2016         /// Allowed in any state (including after shutdown)
2017         pub fn get_channel_update_count(&self) -> u32 {
2018                 self.channel_update_count
2019         }
2020
2021         pub fn should_announce(&self) -> bool {
2022                 self.announce_publicly
2023         }
2024
2025         /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
2026         /// Allowed in any state (including after shutdown)
2027         pub fn get_our_fee_base_msat(&self, fee_estimator: &FeeEstimator) -> u32 {
2028                 // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
2029                 // output value back into a transaction with the regular channel output:
2030
2031                 // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
2032                 let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT) / 1000;
2033
2034                 if self.channel_outbound {
2035                         // + the marginal fee increase cost to us in the commitment transaction:
2036                         res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC / 1000;
2037                 }
2038
2039                 // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
2040                 res += fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT / 1000;
2041
2042                 res as u32
2043         }
2044
2045         /// Returns true if this channel is fully established and not known to be closing.
2046         /// Allowed in any state (including after shutdown)
2047         pub fn is_usable(&self) -> bool {
2048                 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
2049                 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
2050         }
2051
2052         /// Returns true if this channel is currently available for use. This is a superset of
2053         /// is_usable() and considers things like the channel being temporarily disabled.
2054         /// Allowed in any state (including after shutdown)
2055         pub fn is_live(&self) -> bool {
2056                 self.is_usable()
2057         }
2058
2059         /// Returns true if funding_created was sent/received.
2060         pub fn is_funding_initiated(&self) -> bool {
2061                 self.channel_state >= ChannelState::FundingCreated as u32
2062         }
2063
2064         /// Returns true if this channel is fully shut down. True here implies that no further actions
2065         /// may/will be taken on this channel, and thus this object should be freed. Any future changes
2066         /// will be handled appropriately by the chain monitor.
2067         pub fn is_shutdown(&self) -> bool {
2068                 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32  {
2069                         assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
2070                         true
2071                 } else { false }
2072         }
2073
2074         /// Called by channelmanager based on chain blocks being connected.
2075         /// Note that we only need to use this to detect funding_signed, anything else is handled by
2076         /// the channel_monitor.
2077         /// In case of Err, the channel may have been closed, at which point the standard requirements
2078         /// apply - no calls may be made except those explicitly stated to be allowed post-shutdown.
2079         /// Only returns an ErrorAction of DisconnectPeer, if Err.
2080         pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Result<Option<msgs::FundingLocked>, HandleError> {
2081                 let non_shutdown_state = self.channel_state & (!BOTH_SIDES_SHUTDOWN_MASK);
2082                 if self.funding_tx_confirmations > 0 {
2083                         if header.bitcoin_hash() != self.last_block_connected {
2084                                 self.last_block_connected = header.bitcoin_hash();
2085                                 self.funding_tx_confirmations += 1;
2086                                 if self.funding_tx_confirmations == Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat) as u64 {
2087                                         let need_commitment_update = if non_shutdown_state == ChannelState::FundingSent as u32 {
2088                                                 self.channel_state |= ChannelState::OurFundingLocked as u32;
2089                                                 true
2090                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
2091                                                 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & BOTH_SIDES_SHUTDOWN_MASK);
2092                                                 self.channel_update_count += 1;
2093                                                 true
2094                                         } else if self.channel_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
2095                                                 // We got a reorg but not enough to trigger a force close, just update
2096                                                 // funding_tx_confirmed_in and return.
2097                                                 false
2098                                         } else if self.channel_state < ChannelState::ChannelFunded as u32 {
2099                                                 panic!("Started confirming a channel in a state pre-FundingSent?: {}", self.channel_state);
2100                                         } else {
2101                                                 // We got a reorg but not enough to trigger a force close, just update
2102                                                 // funding_tx_confirmed_in and return.
2103                                                 false
2104                                         };
2105                                         self.funding_tx_confirmed_in = Some(header.bitcoin_hash());
2106
2107                                         //TODO: Note that this must be a duplicate of the previous commitment point they sent us,
2108                                         //as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
2109                                         //they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
2110                                         //a protocol oversight, but I assume I'm just missing something.
2111                                         if need_commitment_update {
2112                                                 let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2113                                                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2114                                                 return Ok(Some(msgs::FundingLocked {
2115                                                         channel_id: self.channel_id,
2116                                                         next_per_commitment_point: next_per_commitment_point,
2117                                                 }));
2118                                         }
2119                                 }
2120                         }
2121                 }
2122                 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
2123                         for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
2124                                 if tx.txid() == self.channel_monitor.get_funding_txo().unwrap().txid {
2125                                         let txo_idx = self.channel_monitor.get_funding_txo().unwrap().index as usize;
2126                                         if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
2127                                                         tx.output[txo_idx].value != self.channel_value_satoshis {
2128                                                 if self.channel_outbound {
2129                                                         // If we generated the funding transaction and it doesn't match what it
2130                                                         // should, the client is really broken and we should just panic and
2131                                                         // tell them off. That said, because hash collisions happen with high
2132                                                         // probability in fuzztarget mode, if we're fuzzing we just close the
2133                                                         // channel and move on.
2134                                                         #[cfg(not(feature = "fuzztarget"))]
2135                                                         panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
2136                                                 }
2137                                                 self.channel_state = ChannelState::ShutdownComplete as u32;
2138                                                 self.channel_update_count += 1;
2139                                                 return Err(HandleError{err: "funding tx had wrong script/value", action: Some(ErrorAction::DisconnectPeer{msg: None})});
2140                                         } else {
2141                                                 self.funding_tx_confirmations = 1;
2142                                                 self.short_channel_id = Some(((height as u64)          << (5*8)) |
2143                                                                              ((*index_in_block as u64) << (2*8)) |
2144                                                                              ((txo_idx as u64)         << (0*8)));
2145                                         }
2146                                 }
2147                         }
2148                 }
2149                 Ok(None)
2150         }
2151
2152         /// Called by channelmanager based on chain blocks being disconnected.
2153         /// Returns true if we need to close the channel now due to funding transaction
2154         /// unconfirmation/reorg.
2155         pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
2156                 if self.funding_tx_confirmations > 0 {
2157                         self.funding_tx_confirmations -= 1;
2158                         if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
2159                                 return true;
2160                         }
2161                 }
2162                 if Some(header.bitcoin_hash()) == self.funding_tx_confirmed_in {
2163                         self.funding_tx_confirmations = Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat) as u64 - 1;
2164                 }
2165                 false
2166         }
2167
2168         // Methods to get unprompted messages to send to the remote end (or where we already returned
2169         // something in the handler for the message that prompted this message):
2170
2171         pub fn get_open_channel(&self, chain_hash: Sha256dHash, fee_estimator: &FeeEstimator) -> msgs::OpenChannel {
2172                 if !self.channel_outbound {
2173                         panic!("Tried to open a channel for an inbound channel?");
2174                 }
2175                 if self.channel_state != ChannelState::OurInitSent as u32 {
2176                         panic!("Cannot generate an open_channel after we've moved forward");
2177                 }
2178
2179                 if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
2180                         panic!("Tried to send an open_channel for a channel that has already advanced");
2181                 }
2182
2183                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2184
2185                 msgs::OpenChannel {
2186                         chain_hash: chain_hash,
2187                         temporary_channel_id: self.channel_id,
2188                         funding_satoshis: self.channel_value_satoshis,
2189                         push_msat: self.channel_value_satoshis * 1000 - self.value_to_self_msat,
2190                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2191                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2192                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2193                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2194                         feerate_per_kw: fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) as u32,
2195                         to_self_delay: BREAKDOWN_TIMEOUT,
2196                         max_accepted_htlcs: OUR_MAX_HTLCS,
2197                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2198                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2199                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2200                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2201                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2202                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2203                         channel_flags: if self.announce_publicly {1} else {0},
2204                         shutdown_scriptpubkey: None,
2205                 }
2206         }
2207
2208         pub fn get_accept_channel(&self) -> msgs::AcceptChannel {
2209                 if self.channel_outbound {
2210                         panic!("Tried to send accept_channel for an outbound channel?");
2211                 }
2212                 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
2213                         panic!("Tried to send accept_channel after channel had moved forward");
2214                 }
2215                 if self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
2216                         panic!("Tried to send an accept_channel for a channel that has already advanced");
2217                 }
2218
2219                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2220
2221                 msgs::AcceptChannel {
2222                         temporary_channel_id: self.channel_id,
2223                         dust_limit_satoshis: self.our_dust_limit_satoshis,
2224                         max_htlc_value_in_flight_msat: Channel::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
2225                         channel_reserve_satoshis: Channel::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
2226                         htlc_minimum_msat: self.our_htlc_minimum_msat,
2227                         minimum_depth: Channel::derive_minimum_depth(self.channel_value_satoshis*1000, self.value_to_self_msat),
2228                         to_self_delay: BREAKDOWN_TIMEOUT,
2229                         max_accepted_htlcs: OUR_MAX_HTLCS,
2230                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key),
2231                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.revocation_base_key),
2232                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.payment_base_key),
2233                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.delayed_payment_base_key),
2234                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.htlc_base_key),
2235                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
2236                         shutdown_scriptpubkey: None,
2237                 }
2238         }
2239
2240         fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), HandleError> {
2241                 let funding_script = self.get_funding_redeemscript();
2242
2243                 let remote_keys = self.build_remote_transaction_keys()?;
2244                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false).0;
2245                 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();
2246
2247                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
2248                 Ok((self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key), remote_initial_commitment_tx))
2249         }
2250
2251         /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
2252         /// a funding_created message for the remote peer.
2253         /// Panics if called at some time other than immediately after initial handshake, if called twice,
2254         /// or if called on an inbound channel.
2255         /// Note that channel_id changes during this call!
2256         /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
2257         pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor), HandleError> {
2258                 if !self.channel_outbound {
2259                         panic!("Tried to create outbound funding_created message on an inbound channel!");
2260                 }
2261                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
2262                         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)");
2263                 }
2264                 if self.channel_monitor.get_min_seen_secret() != (1 << 48) || self.cur_remote_commitment_transaction_number != (1 << 48) - 1 || self.cur_local_commitment_transaction_number != (1 << 48) - 1 {
2265                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
2266                 }
2267
2268                 let funding_txo_script = self.get_funding_redeemscript().to_v0_p2wsh();
2269                 self.channel_monitor.set_funding_info((funding_txo, funding_txo_script));
2270
2271                 let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
2272                         Ok(res) => res,
2273                         Err(e) => {
2274                                 log_error!(self, "Got bad signatures: {}!", e.err);
2275                                 self.channel_monitor.unset_funding_info();
2276                                 return Err(e);
2277                         }
2278                 };
2279
2280                 let temporary_channel_id = self.channel_id;
2281
2282                 // Now that we're past error-generating stuff, update our local state:
2283                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number);
2284                 self.channel_state = ChannelState::FundingCreated as u32;
2285                 self.channel_id = funding_txo.to_channel_id();
2286                 self.cur_remote_commitment_transaction_number -= 1;
2287
2288                 Ok((msgs::FundingCreated {
2289                         temporary_channel_id: temporary_channel_id,
2290                         funding_txid: funding_txo.txid,
2291                         funding_output_index: funding_txo.index,
2292                         signature: our_signature
2293                 }, self.channel_monitor.clone()))
2294         }
2295
2296         /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
2297         /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
2298         /// available for use (have exchanged FundingLocked messages in both directions). Should be used
2299         /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
2300         /// Will only fail if we're not in a state where channel_announcement may be sent (including
2301         /// closing).
2302         /// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
2303         /// https://github.com/lightningnetwork/lightning-rfc/issues/468
2304         pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), HandleError> {
2305                 if !self.announce_publicly {
2306                         return Err(HandleError{err: "Channel is not available for public announcements", action: Some(msgs::ErrorAction::IgnoreError)});
2307                 }
2308                 if self.channel_state & (ChannelState::ChannelFunded as u32) == 0 {
2309                         return Err(HandleError{err: "Cannot get a ChannelAnnouncement until the channel funding has been locked", action: Some(msgs::ErrorAction::IgnoreError)});
2310                 }
2311                 if (self.channel_state & (ChannelState::LocalShutdownSent as u32 | ChannelState::ShutdownComplete as u32)) != 0 {
2312                         return Err(HandleError{err: "Cannot get a ChannelAnnouncement once the channel is closing", action: Some(msgs::ErrorAction::IgnoreError)});
2313                 }
2314
2315                 let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
2316                 let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, &self.local_keys.funding_key);
2317
2318                 let msg = msgs::UnsignedChannelAnnouncement {
2319                         features: msgs::GlobalFeatures::new(),
2320                         chain_hash: chain_hash,
2321                         short_channel_id: self.get_short_channel_id().unwrap(),
2322                         node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
2323                         node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
2324                         bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey.unwrap() },
2325                         bitcoin_key_2: if were_node_one { self.their_funding_pubkey.unwrap() } else { our_bitcoin_key },
2326                         excess_data: Vec::new(),
2327                 };
2328
2329                 let msghash = Message::from_slice(&Sha256dHash::from_data(&msg.encode()[..])[..]).unwrap();
2330                 let sig = self.secp_ctx.sign(&msghash, &self.local_keys.funding_key);
2331
2332                 Ok((msg, sig))
2333         }
2334
2335
2336         // Send stuff to our remote peers:
2337
2338         /// Adds a pending outbound HTLC to this channel, note that you probably want
2339         /// send_htlc_and_commit instead cause you'll want both messages at once.
2340         /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
2341         /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
2342         /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
2343         /// You MUST call send_commitment prior to any other calls on this Channel
2344         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> {
2345                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
2346                         return Err(HandleError{err: "Cannot send HTLC until channel is fully established and we haven't started shutting down", action: None});
2347                 }
2348
2349                 if amount_msat > self.channel_value_satoshis * 1000 {
2350                         return Err(HandleError{err: "Cannot send more than the total value of the channel", action: None});
2351                 }
2352                 if amount_msat < self.their_htlc_minimum_msat {
2353                         return Err(HandleError{err: "Cannot send less than their minimum HTLC value", action: None});
2354                 }
2355
2356                 let (_, outbound_htlc_count, htlc_outbound_value_msat, htlc_inbound_value_msat) = self.get_pending_htlc_stats(false);
2357                 if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
2358                         return Err(HandleError{err: "Cannot push more than their max accepted HTLCs", action: None});
2359                 }
2360                 //TODO: Spec is unclear if this is per-direction or in total (I assume per direction):
2361                 // Check their_max_htlc_value_in_flight_msat
2362                 if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
2363                         return Err(HandleError{err: "Cannot send value that would put us over our max HTLC value in flight", action: None});
2364                 }
2365                 // Check their_channel_reserve_satoshis:
2366                 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 {
2367                         return Err(HandleError{err: "Cannot send value that would put us over our reserve value", action: None});
2368                 }
2369
2370                 //TODO: Check cltv_expiry? Do this in channel manager?
2371
2372                 // Now update local state:
2373                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2374                         //TODO: Check the limits *including* other pending holding cell HTLCs!
2375                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
2376                                 amount_msat: amount_msat,
2377                                 payment_hash: payment_hash,
2378                                 cltv_expiry: cltv_expiry,
2379                                 source,
2380                                 onion_routing_packet: onion_routing_packet,
2381                                 time_created: Instant::now(),
2382                         });
2383                         return Ok(None);
2384                 }
2385
2386                 self.pending_outbound_htlcs.push(OutboundHTLCOutput {
2387                         htlc_id: self.next_local_htlc_id,
2388                         amount_msat: amount_msat,
2389                         payment_hash: payment_hash.clone(),
2390                         cltv_expiry: cltv_expiry,
2391                         state: OutboundHTLCState::LocalAnnounced,
2392                         source,
2393                         fail_reason: None,
2394                 });
2395
2396                 let res = msgs::UpdateAddHTLC {
2397                         channel_id: self.channel_id,
2398                         htlc_id: self.next_local_htlc_id,
2399                         amount_msat: amount_msat,
2400                         payment_hash: payment_hash,
2401                         cltv_expiry: cltv_expiry,
2402                         onion_routing_packet: onion_routing_packet,
2403                 };
2404                 self.next_local_htlc_id += 1;
2405
2406                 Ok(Some(res))
2407         }
2408
2409         /// Creates a signed commitment transaction to send to the remote peer.
2410         /// Always returns a Channel-failing HandleError::action if an immediately-preceding (read: the
2411         /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
2412         /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
2413         pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
2414                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2415                         panic!("Cannot create commitment tx until channel is fully established");
2416                 }
2417                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2418                         panic!("Cannot create commitment tx until remote revokes their previous commitment");
2419                 }
2420                 let mut have_updates = false; // TODO initialize with "have we sent a fee update?"
2421                 for htlc in self.pending_outbound_htlcs.iter() {
2422                         if htlc.state == OutboundHTLCState::LocalAnnounced {
2423                                 have_updates = true;
2424                         }
2425                         if have_updates { break; }
2426                 }
2427                 if !have_updates {
2428                         panic!("Cannot create commitment tx until we have some updates to send");
2429                 }
2430                 self.send_commitment_no_status_check()
2431         }
2432         /// Only fails in case of bad keys
2433         fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitor), HandleError> {
2434                 let funding_script = self.get_funding_redeemscript();
2435
2436                 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
2437                 // fail to generate this, we still are at least at a position where upgrading their status
2438                 // is acceptable.
2439                 for htlc in self.pending_inbound_htlcs.iter_mut() {
2440                         if htlc.state == InboundHTLCState::AwaitingRemoteRevokeToAnnounce {
2441                                 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke;
2442                         }
2443                 }
2444                 for htlc in self.pending_outbound_htlcs.iter_mut() {
2445                         if htlc.state == OutboundHTLCState::AwaitingRemoteRevokeToRemove {
2446                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke;
2447                         }
2448                 }
2449
2450                 let remote_keys = self.build_remote_transaction_keys()?;
2451                 let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true);
2452                 let remote_commitment_txid = remote_commitment_tx.0.txid();
2453                 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();
2454                 let our_sig = self.secp_ctx.sign(&remote_sighash, &self.local_keys.funding_key);
2455
2456                 let mut htlc_sigs = Vec::new();
2457
2458                 for ref htlc in remote_commitment_tx.1.iter() {
2459                         let htlc_tx = self.build_htlc_transaction(&remote_commitment_txid, htlc, false, &remote_keys);
2460                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &remote_keys);
2461                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
2462                         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());
2463                         htlc_sigs.push(self.secp_ctx.sign(&htlc_sighash, &our_htlc_key));
2464                 }
2465
2466                 // Update state now that we've passed all the can-fail calls...
2467                 self.channel_monitor.provide_latest_remote_commitment_tx_info(&remote_commitment_tx.0, remote_commitment_tx.1, self.cur_remote_commitment_transaction_number);
2468                 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
2469
2470                 Ok((msgs::CommitmentSigned {
2471                         channel_id: self.channel_id,
2472                         signature: our_sig,
2473                         htlc_signatures: htlc_sigs,
2474                 }, self.channel_monitor.clone()))
2475         }
2476
2477         /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
2478         /// to send to the remote peer in one go.
2479         /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
2480         /// more info.
2481         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> {
2482                 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet)? {
2483                         Some(update_add_htlc) => {
2484                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2485                                 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
2486                         },
2487                         None => Ok(None)
2488                 }
2489         }
2490
2491         /// Begins the shutdown process, getting a message for the remote peer and returning all
2492         /// holding cell HTLCs for payment failure.
2493         pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<(HTLCSource, [u8; 32])>), HandleError> {
2494                 for htlc in self.pending_outbound_htlcs.iter() {
2495                         if htlc.state == OutboundHTLCState::LocalAnnounced {
2496                                 return Err(HandleError{err: "Cannot begin shutdown with pending HTLCs, call send_commitment first", action: None});
2497                         }
2498                 }
2499                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
2500                         return Err(HandleError{err: "Shutdown already in progress", action: None});
2501                 }
2502                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2503
2504                 let our_closing_script = self.get_closing_scriptpubkey();
2505
2506                 // From here on out, we may not fail!
2507                 if self.channel_state < ChannelState::FundingSent as u32 {
2508                         self.channel_state = ChannelState::ShutdownComplete as u32;
2509                 } else {
2510                         self.channel_state |= ChannelState::LocalShutdownSent as u32;
2511                 }
2512                 self.channel_update_count += 1;
2513
2514                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2515                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2516                 // cell HTLCs and return them to fail the payment.
2517                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2518                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2519                         match htlc_update {
2520                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2521                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
2522                                         false
2523                                 },
2524                                 _ => true
2525                         }
2526                 });
2527
2528                 Ok((msgs::Shutdown {
2529                         channel_id: self.channel_id,
2530                         scriptpubkey: our_closing_script,
2531                 }, dropped_outbound_htlcs))
2532         }
2533
2534         /// Gets the latest commitment transaction and any dependant transactions for relay (forcing
2535         /// shutdown of this channel - no more calls into this Channel may be made afterwards except
2536         /// those explicitly stated to be allowed after shutdown completes, eg some simple getters).
2537         /// Also returns the list of payment_hashes for channels which we can safely fail backwards
2538         /// immediately (others we will have to allow to time out).
2539         pub fn force_shutdown(&mut self) -> (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>) {
2540                 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
2541
2542                 // We go ahead and "free" any holding cell HTLCs or HTLCs we haven't yet committed to and
2543                 // return them to fail the payment.
2544                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2545                 for htlc_update in self.holding_cell_htlc_updates.drain(..) {
2546                         match htlc_update {
2547                                 HTLCUpdateAwaitingACK::AddHTLC { source, payment_hash, .. } => {
2548                                         dropped_outbound_htlcs.push((source, payment_hash));
2549                                 },
2550                                 _ => {}
2551                         }
2552                 }
2553
2554                 for _htlc in self.pending_outbound_htlcs.drain(..) {
2555                         //TODO: Do something with the remaining HTLCs
2556                         //(we need to have the ChannelManager monitor them so we can claim the inbound HTLCs
2557                         //which correspond)
2558                 }
2559
2560                 self.channel_state = ChannelState::ShutdownComplete as u32;
2561                 self.channel_update_count += 1;
2562                 let mut res = Vec::new();
2563                 mem::swap(&mut res, &mut self.last_local_commitment_txn);
2564                 (res, dropped_outbound_htlcs)
2565         }
2566 }
2567
2568 #[cfg(test)]
2569 mod tests {
2570         use bitcoin::util::hash::Sha256dHash;
2571         use bitcoin::util::bip143;
2572         use bitcoin::network::serialize::serialize;
2573         use bitcoin::blockdata::script::Script;
2574         use bitcoin::blockdata::transaction::Transaction;
2575         use hex;
2576         use ln::channelmanager::HTLCSource;
2577         use ln::channel::{Channel,ChannelKeys,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,TxCreationKeys};
2578         use ln::channel::MAX_FUNDING_SATOSHIS;
2579         use ln::chan_utils;
2580         use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
2581         use chain::transaction::OutPoint;
2582         use util::test_utils;
2583         use util::logger::Logger;
2584         use secp256k1::{Secp256k1,Message,Signature};
2585         use secp256k1::key::{SecretKey,PublicKey};
2586         use crypto::sha2::Sha256;
2587         use crypto::digest::Digest;
2588         use std::sync::Arc;
2589
2590         struct TestFeeEstimator {
2591                 fee_est: u64
2592         }
2593         impl FeeEstimator for TestFeeEstimator {
2594                 fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
2595                         self.fee_est
2596                 }
2597         }
2598
2599         #[test]
2600         fn test_max_funding_satoshis() {
2601                 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
2602                         "MAX_FUNDING_SATOSHIS is greater than all satoshis on existence");
2603         }
2604
2605         #[test]
2606         fn outbound_commitment_test() {
2607                 // Test vectors from BOLT 3 Appendix C:
2608                 let feeest = TestFeeEstimator{fee_est: 15000};
2609                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
2610                 let secp_ctx = Secp256k1::new();
2611
2612                 let chan_keys = ChannelKeys {
2613                         funding_key: SecretKey::from_slice(&secp_ctx, &hex::decode("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
2614                         payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
2615                         delayed_payment_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
2616                         htlc_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
2617
2618                         // These aren't set in the test vectors:
2619                         revocation_base_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2620                         channel_close_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2621                         channel_monitor_claim_key: SecretKey::from_slice(&secp_ctx, &hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
2622                         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],
2623                 };
2624                 assert_eq!(PublicKey::from_secret_key(&secp_ctx, &chan_keys.funding_key).serialize()[..],
2625                                 hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
2626
2627                 let their_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap());
2628                 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
2629                 chan.their_to_self_delay = 144;
2630                 chan.our_dust_limit_satoshis = 546;
2631
2632                 let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
2633                 chan.channel_monitor.set_funding_info((funding_info, Script::new()));
2634
2635                 chan.their_payment_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
2636                 assert_eq!(chan.their_payment_basepoint.unwrap().serialize()[..],
2637                                 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
2638
2639                 chan.their_funding_pubkey = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13").unwrap()[..]).unwrap()));
2640                 assert_eq!(chan.their_funding_pubkey.unwrap().serialize()[..],
2641                                 hex::decode("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
2642
2643                 chan.their_htlc_basepoint = Some(PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("4444444444444444444444444444444444444444444444444444444444444444").unwrap()[..]).unwrap()));
2644                 assert_eq!(chan.their_htlc_basepoint.unwrap().serialize()[..],
2645                                 hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
2646
2647                 chan.their_revocation_basepoint = Some(PublicKey::from_slice(&secp_ctx, &hex::decode("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap());
2648
2649                 // We can't just use build_local_transaction_keys here as the per_commitment_secret is not
2650                 // derived from a commitment_seed, so instead we copy it here and call
2651                 // build_commitment_transaction.
2652                 let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.delayed_payment_base_key);
2653                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
2654                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
2655                 let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, &chan.local_keys.htlc_base_key);
2656                 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();
2657
2658                 let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
2659
2660                 macro_rules! test_commitment {
2661                         ( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr) => {
2662                                 unsigned_tx = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false);
2663                                 let their_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
2664                                 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();
2665                                 secp_ctx.verify(&sighash, &their_signature, &chan.their_funding_pubkey.unwrap()).unwrap();
2666
2667                                 chan.sign_commitment_transaction(&mut unsigned_tx.0, &their_signature);
2668
2669                                 assert_eq!(serialize(&unsigned_tx.0).unwrap()[..],
2670                                                 hex::decode($tx_hex).unwrap()[..]);
2671                         };
2672                 }
2673
2674                 macro_rules! test_htlc_output {
2675                         ( $htlc_idx: expr, $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr ) => {
2676                                 let remote_signature = Signature::from_der(&secp_ctx, &hex::decode($their_sig_hex).unwrap()[..]).unwrap();
2677
2678                                 let ref htlc = unsigned_tx.1[$htlc_idx];
2679                                 let mut htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys);
2680                                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
2681                                 let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
2682                                 secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
2683
2684                                 let mut preimage: Option<[u8; 32]> = None;
2685                                 if !htlc.offered {
2686                                         for i in 0..5 {
2687                                                 let mut sha = Sha256::new();
2688                                                 sha.input(&[i; 32]);
2689
2690                                                 let mut out = [0; 32];
2691                                                 sha.result(&mut out);
2692
2693                                                 if out == htlc.payment_hash {
2694                                                         preimage = Some([i; 32]);
2695                                                 }
2696                                         }
2697
2698                                         assert!(preimage.is_some());
2699                                 }
2700
2701                                 chan.sign_htlc_transaction(&mut htlc_tx, &remote_signature, &preimage, &htlc, &keys).unwrap();
2702                                 assert_eq!(serialize(&htlc_tx).unwrap()[..],
2703                                                 hex::decode($tx_hex).unwrap()[..]);
2704                         };
2705                 }
2706
2707                 {
2708                         // simple commitment tx with no HTLCs
2709                         chan.value_to_self_msat = 7000000000;
2710
2711                         test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
2712                                          "3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
2713                                          "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");
2714                 }
2715
2716                 chan.pending_inbound_htlcs.push({
2717                         let mut out = InboundHTLCOutput{
2718                                 htlc_id: 0,
2719                                 amount_msat: 1000000,
2720                                 cltv_expiry: 500,
2721                                 payment_hash: [0; 32],
2722                                 state: InboundHTLCState::Committed,
2723                                 local_removed_fulfilled: false,
2724                                 pending_forward_state: None,
2725                         };
2726                         let mut sha = Sha256::new();
2727                         sha.input(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
2728                         sha.result(&mut out.payment_hash);
2729                         out
2730                 });
2731                 chan.pending_inbound_htlcs.push({
2732                         let mut out = InboundHTLCOutput{
2733                                 htlc_id: 1,
2734                                 amount_msat: 2000000,
2735                                 cltv_expiry: 501,
2736                                 payment_hash: [0; 32],
2737                                 state: InboundHTLCState::Committed,
2738                                 local_removed_fulfilled: false,
2739                                 pending_forward_state: None,
2740                         };
2741                         let mut sha = Sha256::new();
2742                         sha.input(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
2743                         sha.result(&mut out.payment_hash);
2744                         out
2745                 });
2746                 chan.pending_outbound_htlcs.push({
2747                         let mut out = OutboundHTLCOutput{
2748                                 htlc_id: 2,
2749                                 amount_msat: 2000000,
2750                                 cltv_expiry: 502,
2751                                 payment_hash: [0; 32],
2752                                 state: OutboundHTLCState::Committed,
2753                                 source: HTLCSource::dummy(),
2754                                 fail_reason: None,
2755                         };
2756                         let mut sha = Sha256::new();
2757                         sha.input(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap());
2758                         sha.result(&mut out.payment_hash);
2759                         out
2760                 });
2761                 chan.pending_outbound_htlcs.push({
2762                         let mut out = OutboundHTLCOutput{
2763                                 htlc_id: 3,
2764                                 amount_msat: 3000000,
2765                                 cltv_expiry: 503,
2766                                 payment_hash: [0; 32],
2767                                 state: OutboundHTLCState::Committed,
2768                                 source: HTLCSource::dummy(),
2769                                 fail_reason: None,
2770                         };
2771                         let mut sha = Sha256::new();
2772                         sha.input(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap());
2773                         sha.result(&mut out.payment_hash);
2774                         out
2775                 });
2776                 chan.pending_inbound_htlcs.push({
2777                         let mut out = InboundHTLCOutput{
2778                                 htlc_id: 4,
2779                                 amount_msat: 4000000,
2780                                 cltv_expiry: 504,
2781                                 payment_hash: [0; 32],
2782                                 state: InboundHTLCState::Committed,
2783                                 local_removed_fulfilled: false,
2784                                 pending_forward_state: None,
2785                         };
2786                         let mut sha = Sha256::new();
2787                         sha.input(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap());
2788                         sha.result(&mut out.payment_hash);
2789                         out
2790                 });
2791
2792                 {
2793                         // commitment tx with all five HTLCs untrimmed (minimum feerate)
2794                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2795                         chan.feerate_per_kw = 0;
2796
2797                         test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
2798                                          "30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
2799                                          "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");
2800
2801                         assert_eq!(unsigned_tx.1.len(), 5);
2802
2803                         test_htlc_output!(0,
2804                                           "304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
2805                                           "304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
2806                                           "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");
2807
2808                         test_htlc_output!(1,
2809                                           "3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
2810                                           "3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
2811                                           "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");
2812
2813                         test_htlc_output!(2,
2814                                           "304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
2815                                           "3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
2816                                           "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");
2817
2818                         test_htlc_output!(3,
2819                                           "3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
2820                                           "30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
2821                                           "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");
2822
2823                         test_htlc_output!(4,
2824                                           "304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
2825                                           "30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
2826                                           "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");
2827                 }
2828
2829                 {
2830                         // commitment tx with seven outputs untrimmed (maximum feerate)
2831                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2832                         chan.feerate_per_kw = 647;
2833
2834                         test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
2835                                          "304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
2836                                          "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");
2837
2838                         assert_eq!(unsigned_tx.1.len(), 5);
2839
2840                         test_htlc_output!(0,
2841                                           "30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
2842                                           "304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
2843                                           "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");
2844
2845                         test_htlc_output!(1,
2846                                           "304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
2847                                           "304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
2848                                           "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");
2849
2850                         test_htlc_output!(2,
2851                                           "304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
2852                                           "3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
2853                                           "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");
2854
2855                         test_htlc_output!(3,
2856                                           "30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
2857                                           "3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
2858                                           "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");
2859
2860                         test_htlc_output!(4,
2861                                           "3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
2862                                           "304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
2863                                           "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");
2864                 }
2865
2866                 {
2867                         // commitment tx with six outputs untrimmed (minimum feerate)
2868                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2869                         chan.feerate_per_kw = 648;
2870
2871                         test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
2872                                          "3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
2873                                          "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");
2874
2875                         assert_eq!(unsigned_tx.1.len(), 4);
2876
2877                         test_htlc_output!(0,
2878                                           "3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
2879                                           "3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
2880                                           "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");
2881
2882                         test_htlc_output!(1,
2883                                           "3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
2884                                           "304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
2885                                           "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");
2886
2887                         test_htlc_output!(2,
2888                                           "3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
2889                                           "304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
2890                                           "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");
2891
2892                         test_htlc_output!(3,
2893                                           "3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
2894                                           "304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
2895                                           "02000000000101579c183eca9e8236a5d7f5dcd79cfec32c497fdc0ec61533cde99ecd436cadd103000000000000000001d90d0000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500473044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f0147304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
2896                 }
2897
2898                 {
2899                         // commitment tx with six outputs untrimmed (maximum feerate)
2900                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2901                         chan.feerate_per_kw = 2069;
2902
2903                         test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
2904                                          "304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
2905                                          "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");
2906
2907                         assert_eq!(unsigned_tx.1.len(), 4);
2908
2909                         test_htlc_output!(0,
2910                                           "3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
2911                                           "3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
2912                                           "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");
2913
2914                         test_htlc_output!(1,
2915                                           "3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
2916                                           "3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
2917                                           "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");
2918
2919                         test_htlc_output!(2,
2920                                           "3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
2921                                           "304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
2922                                           "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");
2923
2924                         test_htlc_output!(3,
2925                                           "30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
2926                                           "304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
2927                                           "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");
2928                 }
2929
2930                 {
2931                         // commitment tx with five outputs untrimmed (minimum feerate)
2932                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2933                         chan.feerate_per_kw = 2070;
2934
2935                         test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
2936                                          "30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
2937                                          "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");
2938
2939                         assert_eq!(unsigned_tx.1.len(), 3);
2940
2941                         test_htlc_output!(0,
2942                                           "3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
2943                                           "3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
2944                                           "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");
2945
2946                         test_htlc_output!(1,
2947                                           "3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
2948                                           "3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
2949                                           "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");
2950
2951                         test_htlc_output!(2,
2952                                           "3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
2953                                           "304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
2954                                           "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");
2955                 }
2956
2957                 {
2958                         // commitment tx with five outputs untrimmed (maximum feerate)
2959                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2960                         chan.feerate_per_kw = 2194;
2961
2962                         test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
2963                                          "304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
2964                                          "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");
2965
2966                         assert_eq!(unsigned_tx.1.len(), 3);
2967
2968                         test_htlc_output!(0,
2969                                           "30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
2970                                           "3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
2971                                           "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");
2972
2973                         test_htlc_output!(1,
2974                                           "30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
2975                                           "304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
2976                                           "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");
2977
2978                         test_htlc_output!(2,
2979                                           "3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
2980                                           "3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
2981                                           "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");
2982                 }
2983
2984                 {
2985                         // commitment tx with four outputs untrimmed (minimum feerate)
2986                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
2987                         chan.feerate_per_kw = 2195;
2988
2989                         test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
2990                                          "304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
2991                                          "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");
2992
2993                         assert_eq!(unsigned_tx.1.len(), 2);
2994
2995                         test_htlc_output!(0,
2996                                           "3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
2997                                           "3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
2998                                           "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");
2999
3000                         test_htlc_output!(1,
3001                                           "3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
3002                                           "30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
3003                                           "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");
3004                 }
3005
3006                 {
3007                         // commitment tx with four outputs untrimmed (maximum feerate)
3008                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3009                         chan.feerate_per_kw = 3702;
3010
3011                         test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
3012                                          "304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
3013                                          "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8004b80b000000000000220020c20b5d1f8584fd90443e7b7b720136174fa4b9333c261d04dbbd012635c0f419a00f0000000000002200208c48d15160397c9731df9bc3b236656efb6665fbfe92b4a6878e88a499f741c4c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de8431106f916a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e040047304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b001483045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c101475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220");
3014
3015                         assert_eq!(unsigned_tx.1.len(), 2);
3016
3017                         test_htlc_output!(0,
3018                                           "3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
3019                                           "304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
3020                                           "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");
3021
3022                         test_htlc_output!(1,
3023                                           "3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
3024                                           "30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
3025                                           "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");
3026                 }
3027
3028                 {
3029                         // commitment tx with three outputs untrimmed (minimum feerate)
3030                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3031                         chan.feerate_per_kw = 3703;
3032
3033                         test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
3034                                          "3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
3035                                          "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");
3036
3037                         assert_eq!(unsigned_tx.1.len(), 1);
3038
3039                         test_htlc_output!(0,
3040                                           "3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
3041                                           "3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
3042                                           "020000000001011c076aa7fb3d7460d10df69432c904227ea84bbf3134d4ceee5fb0f135ef206d0000000000000000000175050000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500473044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd01483045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000");
3043                 }
3044
3045                 {
3046                         // commitment tx with three outputs untrimmed (maximum feerate)
3047                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3048                         chan.feerate_per_kw = 4914;
3049
3050                         test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
3051                                          "304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
3052                                          "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");
3053
3054                         assert_eq!(unsigned_tx.1.len(), 1);
3055
3056                         test_htlc_output!(0,
3057                                           "3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
3058                                           "304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
3059                                           "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");
3060                 }
3061
3062                 {
3063                         // commitment tx with two outputs untrimmed (minimum feerate)
3064                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3065                         chan.feerate_per_kw = 4915;
3066
3067                         test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
3068                                          "3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
3069                                          "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");
3070
3071                         assert_eq!(unsigned_tx.1.len(), 0);
3072                 }
3073
3074                 {
3075                         // commitment tx with two outputs untrimmed (maximum feerate)
3076                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3077                         chan.feerate_per_kw = 9651180;
3078
3079                         test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
3080                                          "30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
3081                                          "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");
3082
3083                         assert_eq!(unsigned_tx.1.len(), 0);
3084                 }
3085
3086                 {
3087                         // commitment tx with one output untrimmed (minimum feerate)
3088                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3089                         chan.feerate_per_kw = 9651181;
3090
3091                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
3092                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
3093                                          "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");
3094
3095                         assert_eq!(unsigned_tx.1.len(), 0);
3096                 }
3097
3098                 {
3099                         // commitment tx with fee greater than funder amount
3100                         chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
3101                         chan.feerate_per_kw = 9651936;
3102
3103                         test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
3104                                          "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
3105                                          "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");
3106
3107                         assert_eq!(unsigned_tx.1.len(), 0);
3108                 }
3109         }
3110
3111         #[test]
3112         fn test_per_commitment_secret_gen() {
3113                 // Test vectors from BOLT 3 Appendix D:
3114
3115                 let mut seed = [0; 32];
3116                 seed[0..32].clone_from_slice(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
3117                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
3118                            hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
3119
3120                 seed[0..32].clone_from_slice(&hex::decode("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
3121                 assert_eq!(chan_utils::build_commitment_secret(seed, 281474976710655),
3122                            hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
3123
3124                 assert_eq!(chan_utils::build_commitment_secret(seed, 0xaaaaaaaaaaa),
3125                            hex::decode("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
3126
3127                 assert_eq!(chan_utils::build_commitment_secret(seed, 0x555555555555),
3128                            hex::decode("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
3129
3130                 seed[0..32].clone_from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
3131                 assert_eq!(chan_utils::build_commitment_secret(seed, 1),
3132                            hex::decode("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
3133         }
3134
3135         #[test]
3136         fn test_key_derivation() {
3137                 // Test vectors from BOLT 3 Appendix E:
3138                 let secp_ctx = Secp256k1::new();
3139
3140                 let base_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
3141                 let per_commitment_secret = SecretKey::from_slice(&secp_ctx, &hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
3142
3143                 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret);
3144                 assert_eq!(base_point.serialize()[..], hex::decode("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
3145
3146                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
3147                 assert_eq!(per_commitment_point.serialize()[..], hex::decode("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
3148
3149                 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
3150                                 hex::decode("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
3151
3152                 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
3153                                 SecretKey::from_slice(&secp_ctx, &hex::decode("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
3154
3155                 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
3156                                 hex::decode("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
3157
3158                 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
3159                                 SecretKey::from_slice(&secp_ctx, &hex::decode("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());
3160         }
3161 }