1 use bitcoin::blockdata::block::BlockHeader;
2 use bitcoin::blockdata::transaction::{TxIn,TxOut,SigHashType,Transaction};
3 use bitcoin::blockdata::script::Script;
4 use bitcoin::network::serialize;
5 use bitcoin::util::hash::Sha256dHash;
6 use bitcoin::util::bip143;
8 use crypto::digest::Digest;
10 use secp256k1::{Secp256k1,Message,Signature};
11 use secp256k1::key::{SecretKey,PublicKey};
13 use ln::msgs::HandleError;
15 use ln::chan_utils::HTLCOutputInCommitment;
16 use chain::chaininterface::{ChainListener, ChainWatchInterface, BroadcasterInterface};
17 use chain::transaction::OutPoint;
18 use util::sha2::Sha256;
21 use std::collections::HashMap;
22 use std::sync::{Arc,Mutex};
25 pub enum ChannelMonitorUpdateErr {
26 /// Used to indicate a temporary failure (eg connection to a watchtower failed, but is expected
27 /// to succeed at some point in the future).
28 /// Such a failure will "freeze" a channel, preventing us from revoking old states or
29 /// submitting new commitment transactions to the remote party.
30 /// ChannelManager::test_restore_channel_monitor can be used to retry the update(s) and restore
31 /// the channel to an operational state.
33 /// Used to indicate no further channel monitor updates will be allowed (eg we've moved on to a
34 /// different watchtower and cannot update with all watchtowers that were previously informed
35 /// of this channel). This will force-close the channel in question.
39 /// Simple trait indicating ability to track a set of ChannelMonitors and multiplex events between
40 /// them. Generally should be implemented by keeping a local SimpleManyChannelMonitor and passing
41 /// events to it, while also taking any add_update_monitor events and passing them to some remote
43 /// Note that any updates to a channel's monitor *must* be applied to each instance of the
44 /// channel's monitor everywhere (including remote watchtowers) *before* this function returns. If
45 /// an update occurs and a remote watchtower is left with old state, it may broadcast transactions
46 /// which we have revoked, allowing our counterparty to claim all funds in the channel!
47 pub trait ManyChannelMonitor: Send + Sync {
48 /// Adds or updates a monitor for the given `funding_txo`.
49 fn add_update_monitor(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr>;
52 /// A simple implementation of a ManyChannelMonitor and ChainListener. Can be used to create a
53 /// watchtower or watch our own channels.
54 /// Note that you must provide your own key by which to refer to channels.
55 /// If you're accepting remote monitors (ie are implementing a watchtower), you must verify that
56 /// users cannot overwrite a given channel by providing a duplicate key. ie you should probably
57 /// index by a PublicKey which is required to sign any updates.
58 /// If you're using this for local monitoring of your own channels, you probably want to use
59 /// `OutPoint` as the key, which will give you a ManyChannelMonitor implementation.
60 pub struct SimpleManyChannelMonitor<Key> {
61 monitors: Mutex<HashMap<Key, ChannelMonitor>>,
62 chain_monitor: Arc<ChainWatchInterface>,
63 broadcaster: Arc<BroadcasterInterface>
66 impl<Key : Send + cmp::Eq + hash::Hash> ChainListener for SimpleManyChannelMonitor<Key> {
67 fn block_connected(&self, _header: &BlockHeader, height: u32, txn_matched: &[&Transaction], _indexes_of_txn_matched: &[u32]) {
68 let monitors = self.monitors.lock().unwrap();
69 for monitor in monitors.values() {
70 monitor.block_connected(txn_matched, height, &*self.broadcaster);
74 fn block_disconnected(&self, _: &BlockHeader) { }
77 impl<Key : Send + cmp::Eq + hash::Hash + 'static> SimpleManyChannelMonitor<Key> {
78 pub fn new(chain_monitor: Arc<ChainWatchInterface>, broadcaster: Arc<BroadcasterInterface>) -> Arc<SimpleManyChannelMonitor<Key>> {
79 let res = Arc::new(SimpleManyChannelMonitor {
80 monitors: Mutex::new(HashMap::new()),
84 let weak_res = Arc::downgrade(&res);
85 res.chain_monitor.register_listener(weak_res);
89 pub fn add_update_monitor_by_key(&self, key: Key, monitor: ChannelMonitor) -> Result<(), HandleError> {
90 let mut monitors = self.monitors.lock().unwrap();
91 match monitors.get_mut(&key) {
92 Some(orig_monitor) => return orig_monitor.insert_combine(monitor),
95 match monitor.funding_txo {
96 None => self.chain_monitor.watch_all_txn(),
97 Some(outpoint) => self.chain_monitor.install_watch_outpoint((outpoint.txid, outpoint.index as u32)),
99 monitors.insert(key, monitor);
104 impl ManyChannelMonitor for SimpleManyChannelMonitor<OutPoint> {
105 fn add_update_monitor(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr> {
106 match self.add_update_monitor_by_key(funding_txo, monitor) {
108 Err(_) => Err(ChannelMonitorUpdateErr::PermanentFailure),
113 /// If an HTLC expires within this many blocks, don't try to claim it in a shared transaction,
114 /// instead claiming it in its own individual transaction.
115 const CLTV_SHARED_CLAIM_BUFFER: u32 = 12;
116 /// If an HTLC expires within this many blocks, force-close the channel to broadcast the
117 /// HTLC-Success transaction.
118 const CLTV_CLAIM_BUFFER: u32 = 6;
120 #[derive(Clone, PartialEq)]
123 revocation_base_key: SecretKey,
124 htlc_base_key: SecretKey,
127 revocation_base_key: PublicKey,
128 htlc_base_key: PublicKey,
129 sigs: HashMap<Sha256dHash, Signature>,
133 #[derive(Clone, PartialEq)]
134 struct LocalSignedTx {
135 /// txid of the transaction in tx, just used to make comparison faster
138 revocation_key: PublicKey,
139 a_htlc_key: PublicKey,
140 b_htlc_key: PublicKey,
141 delayed_payment_key: PublicKey,
143 htlc_outputs: Vec<(HTLCOutputInCommitment, Signature, Signature)>,
146 const SERIALIZATION_VERSION: u8 = 1;
147 const MIN_SERIALIZATION_VERSION: u8 = 1;
149 pub struct ChannelMonitor {
150 funding_txo: Option<OutPoint>,
151 commitment_transaction_number_obscure_factor: u64,
153 key_storage: KeyStorage,
154 delayed_payment_base_key: PublicKey,
155 their_htlc_base_key: Option<PublicKey>,
156 // first is the idx of the first of the two revocation points
157 their_cur_revocation_points: Option<(u64, PublicKey, Option<PublicKey>)>,
159 our_to_self_delay: u16,
160 their_to_self_delay: Option<u16>,
162 old_secrets: [([u8; 32], u64); 49],
163 remote_claimable_outpoints: HashMap<Sha256dHash, Vec<HTLCOutputInCommitment>>,
164 /// We cannot identify HTLC-Success or HTLC-Timeout transactions by themselves on the chain.
165 /// Nor can we figure out their commitment numbers without the commitment transaction they are
166 /// spending. Thus, in order to claim them via revocation key, we track all the remote
167 /// commitment transactions which we find on-chain, mapping them to the commitment number which
168 /// can be used to derive the revocation key and claim the transactions.
169 remote_commitment_txn_on_chain: Mutex<HashMap<Sha256dHash, u64>>,
170 /// Cache used to make pruning of payment_preimages faster.
171 /// Maps payment_hash values to commitment numbers for remote transactions for non-revoked
172 /// remote transactions (ie should remain pretty small).
173 /// Serialized to disk but should generally not be sent to Watchtowers.
174 remote_hash_commitment_number: HashMap<[u8; 32], u64>,
176 // We store two local commitment transactions to avoid any race conditions where we may update
177 // some monitors (potentially on watchtowers) but then fail to update others, resulting in the
178 // various monitors for one channel being out of sync, and us broadcasting a local
179 // transaction for which we have deleted claim information on some watchtowers.
180 prev_local_signed_commitment_tx: Option<LocalSignedTx>,
181 current_local_signed_commitment_tx: Option<LocalSignedTx>,
183 payment_preimages: HashMap<[u8; 32], [u8; 32]>,
185 destination_script: Script,
186 secp_ctx: Secp256k1, //TODO: dedup this a bit...
188 impl Clone for ChannelMonitor {
189 fn clone(&self) -> Self {
191 funding_txo: self.funding_txo.clone(),
192 commitment_transaction_number_obscure_factor: self.commitment_transaction_number_obscure_factor.clone(),
194 key_storage: self.key_storage.clone(),
195 delayed_payment_base_key: self.delayed_payment_base_key.clone(),
196 their_htlc_base_key: self.their_htlc_base_key.clone(),
197 their_cur_revocation_points: self.their_cur_revocation_points.clone(),
199 our_to_self_delay: self.our_to_self_delay,
200 their_to_self_delay: self.their_to_self_delay,
202 old_secrets: self.old_secrets.clone(),
203 remote_claimable_outpoints: self.remote_claimable_outpoints.clone(),
204 remote_commitment_txn_on_chain: Mutex::new((*self.remote_commitment_txn_on_chain.lock().unwrap()).clone()),
205 remote_hash_commitment_number: self.remote_hash_commitment_number.clone(),
207 prev_local_signed_commitment_tx: self.prev_local_signed_commitment_tx.clone(),
208 current_local_signed_commitment_tx: self.current_local_signed_commitment_tx.clone(),
210 payment_preimages: self.payment_preimages.clone(),
212 destination_script: self.destination_script.clone(),
213 secp_ctx: self.secp_ctx.clone(),
218 #[cfg(any(test, feature = "fuzztarget"))]
219 /// Used only in testing and fuzztarget to check serialization roundtrips don't change the
220 /// underlying object
221 impl PartialEq for ChannelMonitor {
222 fn eq(&self, other: &Self) -> bool {
223 if self.funding_txo != other.funding_txo ||
224 self.commitment_transaction_number_obscure_factor != other.commitment_transaction_number_obscure_factor ||
225 self.key_storage != other.key_storage ||
226 self.delayed_payment_base_key != other.delayed_payment_base_key ||
227 self.their_htlc_base_key != other.their_htlc_base_key ||
228 self.their_cur_revocation_points != other.their_cur_revocation_points ||
229 self.our_to_self_delay != other.our_to_self_delay ||
230 self.their_to_self_delay != other.their_to_self_delay ||
231 self.remote_claimable_outpoints != other.remote_claimable_outpoints ||
232 self.remote_hash_commitment_number != other.remote_hash_commitment_number ||
233 self.prev_local_signed_commitment_tx != other.prev_local_signed_commitment_tx ||
234 self.current_local_signed_commitment_tx != other.current_local_signed_commitment_tx ||
235 self.payment_preimages != other.payment_preimages ||
236 self.destination_script != other.destination_script
240 for (&(ref secret, ref idx), &(ref o_secret, ref o_idx)) in self.old_secrets.iter().zip(other.old_secrets.iter()) {
241 if secret != o_secret || idx != o_idx {
245 let us = self.remote_commitment_txn_on_chain.lock().unwrap();
246 let them = other.remote_commitment_txn_on_chain.lock().unwrap();
252 impl ChannelMonitor {
253 pub fn new(revocation_base_key: &SecretKey, delayed_payment_base_key: &PublicKey, htlc_base_key: &SecretKey, our_to_self_delay: u16, destination_script: Script) -> ChannelMonitor {
256 commitment_transaction_number_obscure_factor: 0,
258 key_storage: KeyStorage::PrivMode {
259 revocation_base_key: revocation_base_key.clone(),
260 htlc_base_key: htlc_base_key.clone(),
262 delayed_payment_base_key: delayed_payment_base_key.clone(),
263 their_htlc_base_key: None,
264 their_cur_revocation_points: None,
266 our_to_self_delay: our_to_self_delay,
267 their_to_self_delay: None,
269 old_secrets: [([0; 32], 1 << 48); 49],
270 remote_claimable_outpoints: HashMap::new(),
271 remote_commitment_txn_on_chain: Mutex::new(HashMap::new()),
272 remote_hash_commitment_number: HashMap::new(),
274 prev_local_signed_commitment_tx: None,
275 current_local_signed_commitment_tx: None,
277 payment_preimages: HashMap::new(),
279 destination_script: destination_script,
280 secp_ctx: Secp256k1::new(),
285 fn place_secret(idx: u64) -> u8 {
287 if idx & (1 << i) == (1 << i) {
295 fn derive_secret(secret: [u8; 32], bits: u8, idx: u64) -> [u8; 32] {
296 let mut res: [u8; 32] = secret;
298 let bitpos = bits - 1 - i;
299 if idx & (1 << bitpos) == (1 << bitpos) {
300 res[(bitpos / 8) as usize] ^= 1 << (bitpos & 7);
301 let mut sha = Sha256::new();
303 sha.result(&mut res);
309 /// Inserts a revocation secret into this channel monitor. Also optionally tracks the next
310 /// revocation point which may be required to claim HTLC outputs which we know the preimage of
311 /// in case the remote end force-closes using their latest state. Prunes old preimages if neither
312 /// needed by local commitment transactions HTCLs nor by remote ones. Unless we haven't already seen remote
313 /// commitment transaction's secret, they are de facto pruned (we can use revocation key).
314 pub(super) fn provide_secret(&mut self, idx: u64, secret: [u8; 32], their_next_revocation_point: Option<(u64, PublicKey)>) -> Result<(), HandleError> {
315 let pos = ChannelMonitor::place_secret(idx);
317 let (old_secret, old_idx) = self.old_secrets[i as usize];
318 if ChannelMonitor::derive_secret(secret, pos, old_idx) != old_secret {
319 return Err(HandleError{err: "Previous secret did not match new one", msg: None})
322 self.old_secrets[pos as usize] = (secret, idx);
324 if let Some(new_revocation_point) = their_next_revocation_point {
325 match self.their_cur_revocation_points {
326 Some(old_points) => {
327 if old_points.0 == new_revocation_point.0 + 1 {
328 self.their_cur_revocation_points = Some((old_points.0, old_points.1, Some(new_revocation_point.1)));
329 } else if old_points.0 == new_revocation_point.0 + 2 {
330 if let Some(old_second_point) = old_points.2 {
331 self.their_cur_revocation_points = Some((old_points.0 - 1, old_second_point, Some(new_revocation_point.1)));
333 self.their_cur_revocation_points = Some((new_revocation_point.0, new_revocation_point.1, None));
336 self.their_cur_revocation_points = Some((new_revocation_point.0, new_revocation_point.1, None));
340 self.their_cur_revocation_points = Some((new_revocation_point.0, new_revocation_point.1, None));
345 if !self.payment_preimages.is_empty() {
346 let local_signed_commitment_tx = self.current_local_signed_commitment_tx.as_ref().expect("Channel needs at least an initial commitment tx !");
347 let prev_local_signed_commitment_tx = self.prev_local_signed_commitment_tx.as_ref();
348 let min_idx = self.get_min_seen_secret();
349 let remote_hash_commitment_number = &mut self.remote_hash_commitment_number;
351 self.payment_preimages.retain(|&k, _| {
352 for &(ref htlc, _, _) in &local_signed_commitment_tx.htlc_outputs {
353 if k == htlc.payment_hash {
357 if let Some(prev_local_commitment_tx) = prev_local_signed_commitment_tx {
358 for &(ref htlc, _, _) in prev_local_commitment_tx.htlc_outputs.iter() {
359 if k == htlc.payment_hash {
364 let contains = if let Some(cn) = remote_hash_commitment_number.get(&k) {
371 remote_hash_commitment_number.remove(&k);
380 /// Informs this monitor of the latest remote (ie non-broadcastable) commitment transaction.
381 /// The monitor watches for it to be broadcasted and then uses the HTLC information (and
382 /// possibly future revocation/preimage information) to claim outputs where possible.
383 /// We cache also the mapping hash:commitment number to lighten pruning of old preimages by watchtowers.
384 pub(super) fn provide_latest_remote_commitment_tx_info(&mut self, unsigned_commitment_tx: &Transaction, htlc_outputs: Vec<HTLCOutputInCommitment>, commitment_number: u64) {
385 // TODO: Encrypt the htlc_outputs data with the single-hash of the commitment transaction
386 // so that a remote monitor doesn't learn anything unless there is a malicious close.
387 // (only maybe, sadly we cant do the same for local info, as we need to be aware of
389 for htlc in &htlc_outputs {
390 self.remote_hash_commitment_number.insert(htlc.payment_hash, commitment_number);
392 self.remote_claimable_outpoints.insert(unsigned_commitment_tx.txid(), htlc_outputs);
395 /// Informs this monitor of the latest local (ie broadcastable) commitment transaction. The
396 /// monitor watches for timeouts and may broadcast it if we approach such a timeout. Thus, it
397 /// is important that any clones of this channel monitor (including remote clones) by kept
398 /// up-to-date as our local commitment transaction is updated.
399 /// Panics if set_their_to_self_delay has never been called.
400 pub(super) fn provide_latest_local_commitment_tx_info(&mut self, signed_commitment_tx: Transaction, local_keys: chan_utils::TxCreationKeys, feerate_per_kw: u64, htlc_outputs: Vec<(HTLCOutputInCommitment, Signature, Signature)>) {
401 assert!(self.their_to_self_delay.is_some());
402 self.prev_local_signed_commitment_tx = self.current_local_signed_commitment_tx.take();
403 self.current_local_signed_commitment_tx = Some(LocalSignedTx {
404 txid: signed_commitment_tx.txid(),
405 tx: signed_commitment_tx,
406 revocation_key: local_keys.revocation_key,
407 a_htlc_key: local_keys.a_htlc_key,
408 b_htlc_key: local_keys.b_htlc_key,
409 delayed_payment_key: local_keys.a_delayed_payment_key,
415 /// Provides a payment_hash->payment_preimage mapping. Will be automatically pruned when all
416 /// commitment_tx_infos which contain the payment hash have been revoked.
417 pub(super) fn provide_payment_preimage(&mut self, payment_hash: &[u8; 32], payment_preimage: &[u8; 32]) {
418 self.payment_preimages.insert(payment_hash.clone(), payment_preimage.clone());
421 pub fn insert_combine(&mut self, mut other: ChannelMonitor) -> Result<(), HandleError> {
422 match self.funding_txo {
423 Some(txo) => if other.funding_txo.is_some() && other.funding_txo.unwrap() != txo {
424 return Err(HandleError{err: "Funding transaction outputs are not identical!", msg: None});
426 None => if other.funding_txo.is_some() {
427 self.funding_txo = other.funding_txo;
430 let other_min_secret = other.get_min_seen_secret();
431 let our_min_secret = self.get_min_seen_secret();
432 if our_min_secret > other_min_secret {
433 self.provide_secret(other_min_secret, other.get_secret(other_min_secret).unwrap(), None)?;
435 if our_min_secret >= other_min_secret {
436 self.their_cur_revocation_points = other.their_cur_revocation_points;
437 for (txid, htlcs) in other.remote_claimable_outpoints.drain() {
438 self.remote_claimable_outpoints.insert(txid, htlcs);
440 if let Some(local_tx) = other.prev_local_signed_commitment_tx {
441 self.prev_local_signed_commitment_tx = Some(local_tx);
443 if let Some(local_tx) = other.current_local_signed_commitment_tx {
444 self.current_local_signed_commitment_tx = Some(local_tx);
446 self.payment_preimages = other.payment_preimages;
451 /// Panics if commitment_transaction_number_obscure_factor doesn't fit in 48 bits
452 pub(super) fn set_commitment_obscure_factor(&mut self, commitment_transaction_number_obscure_factor: u64) {
453 assert!(commitment_transaction_number_obscure_factor < (1 << 48));
454 self.commitment_transaction_number_obscure_factor = commitment_transaction_number_obscure_factor;
457 /// Allows this monitor to scan only for transactions which are applicable. Note that this is
458 /// optional, without it this monitor cannot be used in an SPV client, but you may wish to
459 /// avoid this (or call unset_funding_info) on a monitor you wish to send to a watchtower as it
460 /// provides slightly better privacy.
461 pub(super) fn set_funding_info(&mut self, funding_info: OutPoint) {
462 self.funding_txo = Some(funding_info);
465 pub(super) fn set_their_htlc_base_key(&mut self, their_htlc_base_key: &PublicKey) {
466 self.their_htlc_base_key = Some(their_htlc_base_key.clone());
469 pub(super) fn set_their_to_self_delay(&mut self, their_to_self_delay: u16) {
470 self.their_to_self_delay = Some(their_to_self_delay);
473 pub(super) fn unset_funding_info(&mut self) {
474 self.funding_txo = None;
477 pub fn get_funding_txo(&self) -> Option<OutPoint> {
481 /// Serializes into a vec, with various modes for the exposed pub fns
482 fn serialize(&self, for_local_storage: bool) -> Vec<u8> {
483 let mut res = Vec::new();
484 res.push(SERIALIZATION_VERSION);
485 res.push(MIN_SERIALIZATION_VERSION);
487 match self.funding_txo {
489 res.extend_from_slice(&outpoint.txid[..]);
490 res.extend_from_slice(&byte_utils::be16_to_array(outpoint.index));
493 // We haven't even been initialized...not sure why anyone is serializing us, but
494 // not much to give them.
499 // Set in initial Channel-object creation, so should always be set by now:
500 res.extend_from_slice(&byte_utils::be48_to_array(self.commitment_transaction_number_obscure_factor));
502 match self.key_storage {
503 KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key } => {
505 res.extend_from_slice(&revocation_base_key[..]);
506 res.extend_from_slice(&htlc_base_key[..]);
508 KeyStorage::SigsMode { .. } => unimplemented!(),
511 res.extend_from_slice(&self.delayed_payment_base_key.serialize());
512 res.extend_from_slice(&self.their_htlc_base_key.as_ref().unwrap().serialize());
514 match self.their_cur_revocation_points {
515 Some((idx, pubkey, second_option)) => {
516 res.extend_from_slice(&byte_utils::be48_to_array(idx));
517 res.extend_from_slice(&pubkey.serialize());
518 match second_option {
519 Some(second_pubkey) => {
520 res.extend_from_slice(&second_pubkey.serialize());
523 res.extend_from_slice(&[0; 33]);
528 res.extend_from_slice(&byte_utils::be48_to_array(0));
532 res.extend_from_slice(&byte_utils::be16_to_array(self.our_to_self_delay));
533 res.extend_from_slice(&byte_utils::be16_to_array(self.their_to_self_delay.unwrap()));
535 for &(ref secret, ref idx) in self.old_secrets.iter() {
536 res.extend_from_slice(secret);
537 res.extend_from_slice(&byte_utils::be64_to_array(*idx));
540 macro_rules! serialize_htlc_in_commitment {
541 ($htlc_output: expr) => {
542 res.push($htlc_output.offered as u8);
543 res.extend_from_slice(&byte_utils::be64_to_array($htlc_output.amount_msat));
544 res.extend_from_slice(&byte_utils::be32_to_array($htlc_output.cltv_expiry));
545 res.extend_from_slice(&$htlc_output.payment_hash);
546 res.extend_from_slice(&byte_utils::be32_to_array($htlc_output.transaction_output_index));
550 res.extend_from_slice(&byte_utils::be64_to_array(self.remote_claimable_outpoints.len() as u64));
551 for (txid, htlc_outputs) in self.remote_claimable_outpoints.iter() {
552 res.extend_from_slice(&txid[..]);
553 res.extend_from_slice(&byte_utils::be64_to_array(htlc_outputs.len() as u64));
554 for htlc_output in htlc_outputs.iter() {
555 serialize_htlc_in_commitment!(htlc_output);
560 let remote_commitment_txn_on_chain = self.remote_commitment_txn_on_chain.lock().unwrap();
561 res.extend_from_slice(&byte_utils::be64_to_array(remote_commitment_txn_on_chain.len() as u64));
562 for (txid, commitment_number) in remote_commitment_txn_on_chain.iter() {
563 res.extend_from_slice(&txid[..]);
564 res.extend_from_slice(&byte_utils::be48_to_array(*commitment_number));
568 if for_local_storage {
569 res.extend_from_slice(&byte_utils::be64_to_array(self.remote_hash_commitment_number.len() as u64));
570 for (payment_hash, commitment_number) in self.remote_hash_commitment_number.iter() {
571 res.extend_from_slice(payment_hash);
572 res.extend_from_slice(&byte_utils::be48_to_array(*commitment_number));
575 res.extend_from_slice(&byte_utils::be64_to_array(0));
578 macro_rules! serialize_local_tx {
579 ($local_tx: expr) => {
580 let tx_ser = serialize::serialize(&$local_tx.tx).unwrap();
581 res.extend_from_slice(&byte_utils::be64_to_array(tx_ser.len() as u64));
582 res.extend_from_slice(&tx_ser);
584 res.extend_from_slice(&$local_tx.revocation_key.serialize());
585 res.extend_from_slice(&$local_tx.a_htlc_key.serialize());
586 res.extend_from_slice(&$local_tx.b_htlc_key.serialize());
587 res.extend_from_slice(&$local_tx.delayed_payment_key.serialize());
589 res.extend_from_slice(&byte_utils::be64_to_array($local_tx.feerate_per_kw));
590 res.extend_from_slice(&byte_utils::be64_to_array($local_tx.htlc_outputs.len() as u64));
591 for &(ref htlc_output, ref their_sig, ref our_sig) in $local_tx.htlc_outputs.iter() {
592 serialize_htlc_in_commitment!(htlc_output);
593 res.extend_from_slice(&their_sig.serialize_compact(&self.secp_ctx));
594 res.extend_from_slice(&our_sig.serialize_compact(&self.secp_ctx));
599 if let Some(ref prev_local_tx) = self.prev_local_signed_commitment_tx {
601 serialize_local_tx!(prev_local_tx);
606 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
608 serialize_local_tx!(cur_local_tx);
613 res.extend_from_slice(&byte_utils::be64_to_array(self.payment_preimages.len() as u64));
614 for payment_preimage in self.payment_preimages.values() {
615 res.extend_from_slice(payment_preimage);
618 res.extend_from_slice(&byte_utils::be64_to_array(self.destination_script.len() as u64));
619 res.extend_from_slice(&self.destination_script[..]);
624 /// Encodes this monitor into a byte array, suitable for writing to disk.
625 pub fn serialize_for_disk(&self) -> Vec<u8> {
629 /// Encodes this monitor into a byte array, suitable for sending to a remote watchtower
630 pub fn serialize_for_watchtower(&self) -> Vec<u8> {
631 self.serialize(false)
634 /// Attempts to decode a serialized monitor
635 pub fn deserialize(data: &[u8]) -> Option<Self> {
636 let mut read_pos = 0;
637 macro_rules! read_bytes {
638 ($byte_count: expr) => {
640 if ($byte_count as usize) > data.len() - read_pos {
643 read_pos += $byte_count as usize;
644 &data[read_pos - $byte_count as usize..read_pos]
649 let secp_ctx = Secp256k1::new();
650 macro_rules! unwrap_obj {
654 Err(_) => return None,
659 let _ver = read_bytes!(1)[0];
660 let min_ver = read_bytes!(1)[0];
661 if min_ver > SERIALIZATION_VERSION {
665 // Technically this can fail and serialize fail a round-trip, but only for serialization of
666 // barely-init'd ChannelMonitors that we can't do anything with.
667 let funding_txo = Some(OutPoint {
668 txid: Sha256dHash::from(read_bytes!(32)),
669 index: byte_utils::slice_to_be16(read_bytes!(2)),
671 let commitment_transaction_number_obscure_factor = byte_utils::slice_to_be48(read_bytes!(6));
673 let key_storage = match read_bytes!(1)[0] {
675 KeyStorage::PrivMode {
676 revocation_base_key: unwrap_obj!(SecretKey::from_slice(&secp_ctx, read_bytes!(32))),
677 htlc_base_key: unwrap_obj!(SecretKey::from_slice(&secp_ctx, read_bytes!(32))),
683 let delayed_payment_base_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
684 let their_htlc_base_key = Some(unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33))));
686 let their_cur_revocation_points = {
687 let first_idx = byte_utils::slice_to_be48(read_bytes!(6));
691 let first_point = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
692 let second_point_slice = read_bytes!(33);
693 if second_point_slice[0..32] == [0; 32] && second_point_slice[32] == 0 {
694 Some((first_idx, first_point, None))
696 Some((first_idx, first_point, Some(unwrap_obj!(PublicKey::from_slice(&secp_ctx, second_point_slice)))))
701 let our_to_self_delay = byte_utils::slice_to_be16(read_bytes!(2));
702 let their_to_self_delay = Some(byte_utils::slice_to_be16(read_bytes!(2)));
704 let mut old_secrets = [([0; 32], 1 << 48); 49];
705 for &mut (ref mut secret, ref mut idx) in old_secrets.iter_mut() {
706 secret.copy_from_slice(read_bytes!(32));
707 *idx = byte_utils::slice_to_be64(read_bytes!(8));
710 macro_rules! read_htlc_in_commitment {
713 let offered = match read_bytes!(1)[0] {
714 0 => false, 1 => true,
717 let amount_msat = byte_utils::slice_to_be64(read_bytes!(8));
718 let cltv_expiry = byte_utils::slice_to_be32(read_bytes!(4));
719 let mut payment_hash = [0; 32];
720 payment_hash[..].copy_from_slice(read_bytes!(32));
721 let transaction_output_index = byte_utils::slice_to_be32(read_bytes!(4));
723 HTLCOutputInCommitment {
724 offered, amount_msat, cltv_expiry, payment_hash, transaction_output_index
730 let remote_claimable_outpoints_len = byte_utils::slice_to_be64(read_bytes!(8));
731 if remote_claimable_outpoints_len > data.len() as u64 / 64 { return None; }
732 let mut remote_claimable_outpoints = HashMap::with_capacity(remote_claimable_outpoints_len as usize);
733 for _ in 0..remote_claimable_outpoints_len {
734 let txid = Sha256dHash::from(read_bytes!(32));
735 let outputs_count = byte_utils::slice_to_be64(read_bytes!(8));
736 if outputs_count > data.len() as u64 * 32 { return None; }
737 let mut outputs = Vec::with_capacity(outputs_count as usize);
738 for _ in 0..outputs_count {
739 outputs.push(read_htlc_in_commitment!());
741 if let Some(_) = remote_claimable_outpoints.insert(txid, outputs) {
746 let remote_commitment_txn_on_chain_len = byte_utils::slice_to_be64(read_bytes!(8));
747 if remote_commitment_txn_on_chain_len > data.len() as u64 / 32 { return None; }
748 let mut remote_commitment_txn_on_chain = HashMap::with_capacity(remote_commitment_txn_on_chain_len as usize);
749 for _ in 0..remote_commitment_txn_on_chain_len {
750 let txid = Sha256dHash::from(read_bytes!(32));
751 let commitment_number = byte_utils::slice_to_be48(read_bytes!(6));
752 if let Some(_) = remote_commitment_txn_on_chain.insert(txid, commitment_number) {
757 let remote_hash_commitment_number_len = byte_utils::slice_to_be64(read_bytes!(8));
758 if remote_hash_commitment_number_len > data.len() as u64 / 32 { return None; }
759 let mut remote_hash_commitment_number = HashMap::with_capacity(remote_hash_commitment_number_len as usize);
760 for _ in 0..remote_hash_commitment_number_len {
761 let mut txid = [0; 32];
762 txid[..].copy_from_slice(read_bytes!(32));
763 let commitment_number = byte_utils::slice_to_be48(read_bytes!(6));
764 if let Some(_) = remote_hash_commitment_number.insert(txid, commitment_number) {
769 macro_rules! read_local_tx {
772 let tx_len = byte_utils::slice_to_be64(read_bytes!(8));
773 let tx: Transaction = unwrap_obj!(serialize::deserialize(read_bytes!(tx_len)));
775 let revocation_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
776 let a_htlc_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
777 let b_htlc_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
778 let delayed_payment_key = unwrap_obj!(PublicKey::from_slice(&secp_ctx, read_bytes!(33)));
779 let feerate_per_kw = byte_utils::slice_to_be64(read_bytes!(8));
781 let htlc_outputs_len = byte_utils::slice_to_be64(read_bytes!(8));
782 if htlc_outputs_len > data.len() as u64 / 128 { return None; }
783 let mut htlc_outputs = Vec::with_capacity(htlc_outputs_len as usize);
784 for _ in 0..htlc_outputs_len {
785 htlc_outputs.push((read_htlc_in_commitment!(),
786 unwrap_obj!(Signature::from_compact(&secp_ctx, read_bytes!(64))),
787 unwrap_obj!(Signature::from_compact(&secp_ctx, read_bytes!(64)))));
792 tx, revocation_key, a_htlc_key, b_htlc_key, delayed_payment_key, feerate_per_kw, htlc_outputs
798 let prev_local_signed_commitment_tx = match read_bytes!(1)[0] {
801 Some(read_local_tx!())
806 let current_local_signed_commitment_tx = match read_bytes!(1)[0] {
809 Some(read_local_tx!())
814 let payment_preimages_len = byte_utils::slice_to_be64(read_bytes!(8));
815 if payment_preimages_len > data.len() as u64 / 32 { return None; }
816 let mut payment_preimages = HashMap::with_capacity(payment_preimages_len as usize);
817 let mut sha = Sha256::new();
818 for _ in 0..payment_preimages_len {
819 let mut preimage = [0; 32];
820 preimage[..].copy_from_slice(read_bytes!(32));
822 sha.input(&preimage);
823 let mut hash = [0; 32];
824 sha.result(&mut hash);
825 if let Some(_) = payment_preimages.insert(hash, preimage) {
830 let destination_script_len = byte_utils::slice_to_be64(read_bytes!(8));
831 let destination_script = Script::from(read_bytes!(destination_script_len).to_vec());
833 Some(ChannelMonitor {
835 commitment_transaction_number_obscure_factor,
838 delayed_payment_base_key,
840 their_cur_revocation_points,
846 remote_claimable_outpoints,
847 remote_commitment_txn_on_chain: Mutex::new(remote_commitment_txn_on_chain),
848 remote_hash_commitment_number,
850 prev_local_signed_commitment_tx,
851 current_local_signed_commitment_tx,
860 //TODO: Functions to serialize/deserialize (with different forms depending on which information
861 //we want to leave out (eg funding_txo, etc).
863 /// Can only fail if idx is < get_min_seen_secret
864 pub fn get_secret(&self, idx: u64) -> Result<[u8; 32], HandleError> {
865 for i in 0..self.old_secrets.len() {
866 if (idx & (!((1 << i) - 1))) == self.old_secrets[i].1 {
867 return Ok(ChannelMonitor::derive_secret(self.old_secrets[i].0, i as u8, idx))
870 assert!(idx < self.get_min_seen_secret());
871 Err(HandleError{err: "idx too low", msg: None})
874 pub fn get_min_seen_secret(&self) -> u64 {
875 //TODO This can be optimized?
876 let mut min = 1 << 48;
877 for &(_, idx) in self.old_secrets.iter() {
885 /// Attempts to claim a remote commitment transaction's outputs using the revocation key and
886 /// data in remote_claimable_outpoints. Will directly claim any HTLC outputs which expire at a
887 /// height > height + CLTV_SHARED_CLAIM_BUFFER. In any case, will install monitoring for
888 /// HTLC-Success/HTLC-Timeout transactions, and claim them using the revocation key (if
889 /// applicable) as well.
890 fn check_spend_remote_transaction(&self, tx: &Transaction, height: u32) -> Vec<Transaction> {
891 // Most secp and related errors trying to create keys means we have no hope of constructing
892 // a spend transaction...so we return no transactions to broadcast
893 let mut txn_to_broadcast = Vec::new();
894 macro_rules! ignore_error {
895 ( $thing : expr ) => {
898 Err(_) => return txn_to_broadcast
903 let commitment_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers!
904 let per_commitment_option = self.remote_claimable_outpoints.get(&commitment_txid);
906 let commitment_number = (((tx.input[0].sequence as u64 & 0xffffff) << 3*8) | (tx.lock_time as u64 & 0xffffff)) ^ self.commitment_transaction_number_obscure_factor;
907 if commitment_number >= self.get_min_seen_secret() {
908 let secret = self.get_secret(commitment_number).unwrap();
909 let per_commitment_key = ignore_error!(SecretKey::from_slice(&self.secp_ctx, &secret));
910 let (revocation_pubkey, b_htlc_key) = match self.key_storage {
911 KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key } => {
912 let per_commitment_point = ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key));
913 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key)))),
914 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &htlc_base_key)))))
916 KeyStorage::SigsMode { ref revocation_base_key, ref htlc_base_key, .. } => {
917 let per_commitment_point = ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key));
918 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &revocation_base_key)),
919 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &htlc_base_key)))
922 let delayed_key = ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key)), &self.delayed_payment_base_key));
923 let a_htlc_key = match self.their_htlc_base_key {
924 None => return txn_to_broadcast,
925 Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key)), &their_htlc_base_key)),
928 let revokeable_redeemscript = chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.our_to_self_delay, &delayed_key);
929 let revokeable_p2wsh = revokeable_redeemscript.to_v0_p2wsh();
931 let mut total_value = 0;
932 let mut values = Vec::new();
933 let mut inputs = Vec::new();
934 let mut htlc_idxs = Vec::new();
936 for (idx, outp) in tx.output.iter().enumerate() {
937 if outp.script_pubkey == revokeable_p2wsh {
939 prev_hash: commitment_txid,
940 prev_index: idx as u32,
941 script_sig: Script::new(),
942 sequence: 0xfffffffd,
945 htlc_idxs.push(None);
946 values.push(outp.value);
947 total_value += outp.value;
948 break; // There can only be one of these
952 macro_rules! sign_input {
953 ($sighash_parts: expr, $input: expr, $htlc_idx: expr, $amount: expr) => {
955 let (sig, redeemscript) = match self.key_storage {
956 KeyStorage::PrivMode { ref revocation_base_key, .. } => {
957 let redeemscript = if $htlc_idx.is_none() { revokeable_redeemscript.clone() } else {
958 let htlc = &per_commitment_option.unwrap()[$htlc_idx.unwrap()];
959 chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey)
961 let sighash = ignore_error!(Message::from_slice(&$sighash_parts.sighash_all(&$input, &redeemscript, $amount)[..]));
962 let revocation_key = ignore_error!(chan_utils::derive_private_revocation_key(&self.secp_ctx, &per_commitment_key, &revocation_base_key));
963 (ignore_error!(self.secp_ctx.sign(&sighash, &revocation_key)), redeemscript)
965 KeyStorage::SigsMode { .. } => {
969 $input.witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
970 $input.witness[0].push(SigHashType::All as u8);
971 if $htlc_idx.is_none() {
972 $input.witness.push(vec!(1));
974 $input.witness.push(revocation_pubkey.serialize().to_vec());
976 $input.witness.push(redeemscript.into_vec());
981 if let Some(per_commitment_data) = per_commitment_option {
982 inputs.reserve_exact(per_commitment_data.len());
984 for (idx, htlc) in per_commitment_data.iter().enumerate() {
985 let expected_script = chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey);
986 if htlc.transaction_output_index as usize >= tx.output.len() ||
987 tx.output[htlc.transaction_output_index as usize].value != htlc.amount_msat / 1000 ||
988 tx.output[htlc.transaction_output_index as usize].script_pubkey != expected_script.to_v0_p2wsh() {
989 return txn_to_broadcast; // Corrupted per_commitment_data, fuck this user
992 prev_hash: commitment_txid,
993 prev_index: htlc.transaction_output_index,
994 script_sig: Script::new(),
995 sequence: 0xfffffffd,
998 if htlc.cltv_expiry > height + CLTV_SHARED_CLAIM_BUFFER {
1000 htlc_idxs.push(Some(idx));
1001 values.push(tx.output[htlc.transaction_output_index as usize].value);
1002 total_value += htlc.amount_msat / 1000;
1004 let mut single_htlc_tx = Transaction {
1008 output: vec!(TxOut {
1009 script_pubkey: self.destination_script.clone(),
1010 value: htlc.amount_msat / 1000, //TODO: - fee
1013 let sighash_parts = bip143::SighashComponents::new(&single_htlc_tx);
1014 sign_input!(sighash_parts, single_htlc_tx.input[0], Some(idx), htlc.amount_msat / 1000);
1015 txn_to_broadcast.push(single_htlc_tx); // TODO: This is not yet tested in ChannelManager!
1020 if !inputs.is_empty() || !txn_to_broadcast.is_empty() { // ie we're confident this is actually ours
1021 // We're definitely a remote commitment transaction!
1022 // TODO: Register commitment_txid with the ChainWatchInterface!
1023 self.remote_commitment_txn_on_chain.lock().unwrap().insert(commitment_txid, commitment_number);
1025 if inputs.is_empty() { return txn_to_broadcast; } // Nothing to be done...probably a false positive/local tx
1027 let outputs = vec!(TxOut {
1028 script_pubkey: self.destination_script.clone(),
1029 value: total_value, //TODO: - fee
1031 let mut spend_tx = Transaction {
1038 let mut values_drain = values.drain(..);
1039 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1041 for (input, htlc_idx) in spend_tx.input.iter_mut().zip(htlc_idxs.iter()) {
1042 let value = values_drain.next().unwrap();
1043 sign_input!(sighash_parts, input, htlc_idx, value);
1046 txn_to_broadcast.push(spend_tx);
1047 } else if let Some(per_commitment_data) = per_commitment_option {
1048 // While this isn't useful yet, there is a potential race where if a counterparty
1049 // revokes a state at the same time as the commitment transaction for that state is
1050 // confirmed, and the watchtower receives the block before the user, the user could
1051 // upload a new ChannelMonitor with the revocation secret but the watchtower has
1052 // already processed the block, resulting in the remote_commitment_txn_on_chain entry
1053 // not being generated by the above conditional. Thus, to be safe, we go ahead and
1055 self.remote_commitment_txn_on_chain.lock().unwrap().insert(commitment_txid, commitment_number);
1057 if let Some(revocation_points) = self.their_cur_revocation_points {
1058 let revocation_point_option =
1059 if revocation_points.0 == commitment_number { Some(&revocation_points.1) }
1060 else if let Some(point) = revocation_points.2.as_ref() {
1061 if revocation_points.0 == commitment_number + 1 { Some(point) } else { None }
1063 if let Some(revocation_point) = revocation_point_option {
1064 let (revocation_pubkey, b_htlc_key) = match self.key_storage {
1065 KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key } => {
1066 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, revocation_point, &ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key)))),
1067 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &ignore_error!(PublicKey::from_secret_key(&self.secp_ctx, &htlc_base_key)))))
1069 KeyStorage::SigsMode { ref revocation_base_key, ref htlc_base_key, .. } => {
1070 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, revocation_point, &revocation_base_key)),
1071 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &htlc_base_key)))
1074 let a_htlc_key = match self.their_htlc_base_key {
1075 None => return txn_to_broadcast,
1076 Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &their_htlc_base_key)),
1079 let mut total_value = 0;
1080 let mut values = Vec::new();
1081 let mut inputs = Vec::new();
1083 macro_rules! sign_input {
1084 ($sighash_parts: expr, $input: expr, $amount: expr, $preimage: expr) => {
1086 let (sig, redeemscript) = match self.key_storage {
1087 KeyStorage::PrivMode { ref htlc_base_key, .. } => {
1088 let htlc = &per_commitment_option.unwrap()[$input.sequence as usize];
1089 let redeemscript = chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey);
1090 let sighash = ignore_error!(Message::from_slice(&$sighash_parts.sighash_all(&$input, &redeemscript, $amount)[..]));
1091 let htlc_key = ignore_error!(chan_utils::derive_private_key(&self.secp_ctx, revocation_point, &htlc_base_key));
1092 (ignore_error!(self.secp_ctx.sign(&sighash, &htlc_key)), redeemscript)
1094 KeyStorage::SigsMode { .. } => {
1098 $input.witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
1099 $input.witness[0].push(SigHashType::All as u8);
1100 $input.witness.push($preimage);
1101 $input.witness.push(redeemscript.into_vec());
1106 for (idx, htlc) in per_commitment_data.iter().enumerate() {
1107 if let Some(payment_preimage) = self.payment_preimages.get(&htlc.payment_hash) {
1109 prev_hash: commitment_txid,
1110 prev_index: htlc.transaction_output_index,
1111 script_sig: Script::new(),
1112 sequence: idx as u32, // reset to 0xfffffffd in sign_input
1113 witness: Vec::new(),
1115 if htlc.cltv_expiry > height + CLTV_SHARED_CLAIM_BUFFER {
1117 values.push((tx.output[htlc.transaction_output_index as usize].value, payment_preimage));
1118 total_value += htlc.amount_msat / 1000;
1120 let mut single_htlc_tx = Transaction {
1124 output: vec!(TxOut {
1125 script_pubkey: self.destination_script.clone(),
1126 value: htlc.amount_msat / 1000, //TODO: - fee
1129 let sighash_parts = bip143::SighashComponents::new(&single_htlc_tx);
1130 sign_input!(sighash_parts, single_htlc_tx.input[0], htlc.amount_msat / 1000, payment_preimage.to_vec());
1131 txn_to_broadcast.push(single_htlc_tx);
1136 if inputs.is_empty() { return txn_to_broadcast; } // Nothing to be done...probably a false positive/local tx
1138 let outputs = vec!(TxOut {
1139 script_pubkey: self.destination_script.clone(),
1140 value: total_value, //TODO: - fee
1142 let mut spend_tx = Transaction {
1149 let mut values_drain = values.drain(..);
1150 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1152 for input in spend_tx.input.iter_mut() {
1153 let value = values_drain.next().unwrap();
1154 sign_input!(sighash_parts, input, value.0, value.1.to_vec());
1157 txn_to_broadcast.push(spend_tx);
1161 //TODO: For each input check if its in our remote_commitment_txn_on_chain map!
1167 fn broadcast_by_local_state(&self, local_tx: &LocalSignedTx) -> Vec<Transaction> {
1168 let mut res = Vec::with_capacity(local_tx.htlc_outputs.len());
1170 for &(ref htlc, ref their_sig, ref our_sig) in local_tx.htlc_outputs.iter() {
1172 let mut htlc_timeout_tx = chan_utils::build_htlc_transaction(&local_tx.txid, local_tx.feerate_per_kw, self.their_to_self_delay.unwrap(), htlc, &local_tx.delayed_payment_key, &local_tx.revocation_key);
1174 htlc_timeout_tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1176 htlc_timeout_tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1177 htlc_timeout_tx.input[0].witness[1].push(SigHashType::All as u8);
1178 htlc_timeout_tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1179 htlc_timeout_tx.input[0].witness[2].push(SigHashType::All as u8);
1181 htlc_timeout_tx.input[0].witness.push(Vec::new());
1182 htlc_timeout_tx.input[0].witness.push(chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &local_tx.a_htlc_key, &local_tx.b_htlc_key, &local_tx.revocation_key).into_vec());
1184 res.push(htlc_timeout_tx);
1186 if let Some(payment_preimage) = self.payment_preimages.get(&htlc.payment_hash) {
1187 let mut htlc_success_tx = chan_utils::build_htlc_transaction(&local_tx.txid, local_tx.feerate_per_kw, self.their_to_self_delay.unwrap(), htlc, &local_tx.delayed_payment_key, &local_tx.revocation_key);
1189 htlc_success_tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1191 htlc_success_tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1192 htlc_success_tx.input[0].witness[1].push(SigHashType::All as u8);
1193 htlc_success_tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1194 htlc_success_tx.input[0].witness[2].push(SigHashType::All as u8);
1196 htlc_success_tx.input[0].witness.push(payment_preimage.to_vec());
1197 htlc_success_tx.input[0].witness.push(chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &local_tx.a_htlc_key, &local_tx.b_htlc_key, &local_tx.revocation_key).into_vec());
1199 res.push(htlc_success_tx);
1207 /// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
1208 /// revoked using data in local_claimable_outpoints.
1209 /// Should not be used if check_spend_revoked_transaction succeeds.
1210 fn check_spend_local_transaction(&self, tx: &Transaction, _height: u32) -> Vec<Transaction> {
1211 let commitment_txid = tx.txid();
1212 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
1213 if local_tx.txid == commitment_txid {
1214 return self.broadcast_by_local_state(local_tx);
1217 if let &Some(ref local_tx) = &self.prev_local_signed_commitment_tx {
1218 if local_tx.txid == commitment_txid {
1219 return self.broadcast_by_local_state(local_tx);
1225 fn block_connected(&self, txn_matched: &[&Transaction], height: u32, broadcaster: &BroadcasterInterface) {
1226 for tx in txn_matched {
1227 for txin in tx.input.iter() {
1228 if self.funding_txo.is_none() || (txin.prev_hash == self.funding_txo.unwrap().txid && txin.prev_index == self.funding_txo.unwrap().index as u32) {
1229 let mut txn = self.check_spend_remote_transaction(tx, height);
1231 txn = self.check_spend_local_transaction(tx, height);
1233 for tx in txn.iter() {
1234 broadcaster.broadcast_transaction(tx);
1239 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
1240 let mut needs_broadcast = false;
1241 for &(ref htlc, _, _) in cur_local_tx.htlc_outputs.iter() {
1242 if htlc.cltv_expiry <= height + CLTV_CLAIM_BUFFER {
1243 if htlc.offered || self.payment_preimages.contains_key(&htlc.payment_hash) {
1244 needs_broadcast = true;
1249 if needs_broadcast {
1250 broadcaster.broadcast_transaction(&cur_local_tx.tx);
1251 for tx in self.broadcast_by_local_state(&cur_local_tx) {
1252 broadcaster.broadcast_transaction(&tx);
1258 pub fn would_broadcast_at_height(&self, height: u32) -> bool {
1259 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
1260 for &(ref htlc, _, _) in cur_local_tx.htlc_outputs.iter() {
1261 if htlc.cltv_expiry <= height + CLTV_CLAIM_BUFFER {
1262 if htlc.offered || self.payment_preimages.contains_key(&htlc.payment_hash) {
1274 use bitcoin::util::misc::hex_bytes;
1275 use bitcoin::blockdata::script::Script;
1276 use bitcoin::blockdata::transaction::Transaction;
1277 use crypto::digest::Digest;
1278 use ln::channelmonitor::ChannelMonitor;
1279 use ln::chan_utils::{HTLCOutputInCommitment, TxCreationKeys};
1280 use util::sha2::Sha256;
1281 use secp256k1::key::{SecretKey,PublicKey};
1282 use secp256k1::{Secp256k1, Signature};
1283 use rand::{thread_rng,Rng};
1286 fn test_per_commitment_storage() {
1287 // Test vectors from BOLT 3:
1288 let mut secrets: Vec<[u8; 32]> = Vec::new();
1289 let mut monitor: ChannelMonitor;
1290 let secp_ctx = Secp256k1::new();
1292 macro_rules! test_secrets {
1294 let mut idx = 281474976710655;
1295 for secret in secrets.iter() {
1296 assert_eq!(monitor.get_secret(idx).unwrap(), *secret);
1299 assert_eq!(monitor.get_min_seen_secret(), idx + 1);
1300 assert!(monitor.get_secret(idx).is_err());
1305 // insert_secret correct sequence
1306 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1309 secrets.push([0; 32]);
1310 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1311 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1314 secrets.push([0; 32]);
1315 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1316 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1319 secrets.push([0; 32]);
1320 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1321 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1324 secrets.push([0; 32]);
1325 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1326 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap();
1329 secrets.push([0; 32]);
1330 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1331 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone(), None).unwrap();
1334 secrets.push([0; 32]);
1335 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1336 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone(), None).unwrap();
1339 secrets.push([0; 32]);
1340 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1341 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone(), None).unwrap();
1344 secrets.push([0; 32]);
1345 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1346 monitor.provide_secret(281474976710648, secrets.last().unwrap().clone(), None).unwrap();
1351 // insert_secret #1 incorrect
1352 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1355 secrets.push([0; 32]);
1356 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1357 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1360 secrets.push([0; 32]);
1361 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1362 assert_eq!(monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap_err().err,
1363 "Previous secret did not match new one");
1367 // insert_secret #2 incorrect (#1 derived from incorrect)
1368 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1371 secrets.push([0; 32]);
1372 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1373 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1376 secrets.push([0; 32]);
1377 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
1378 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1381 secrets.push([0; 32]);
1382 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1383 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1386 secrets.push([0; 32]);
1387 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1388 assert_eq!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap_err().err,
1389 "Previous secret did not match new one");
1393 // insert_secret #3 incorrect
1394 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1397 secrets.push([0; 32]);
1398 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1399 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1402 secrets.push([0; 32]);
1403 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1404 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1407 secrets.push([0; 32]);
1408 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
1409 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1412 secrets.push([0; 32]);
1413 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1414 assert_eq!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap_err().err,
1415 "Previous secret did not match new one");
1419 // insert_secret #4 incorrect (1,2,3 derived from incorrect)
1420 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1423 secrets.push([0; 32]);
1424 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1425 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1428 secrets.push([0; 32]);
1429 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
1430 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1433 secrets.push([0; 32]);
1434 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
1435 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1438 secrets.push([0; 32]);
1439 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("ba65d7b0ef55a3ba300d4e87af29868f394f8f138d78a7011669c79b37b936f4").unwrap());
1440 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap();
1443 secrets.push([0; 32]);
1444 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1445 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone(), None).unwrap();
1448 secrets.push([0; 32]);
1449 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1450 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone(), None).unwrap();
1453 secrets.push([0; 32]);
1454 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1455 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone(), None).unwrap();
1458 secrets.push([0; 32]);
1459 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1460 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone(), None).unwrap_err().err,
1461 "Previous secret did not match new one");
1465 // insert_secret #5 incorrect
1466 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1469 secrets.push([0; 32]);
1470 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1471 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1474 secrets.push([0; 32]);
1475 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1476 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1479 secrets.push([0; 32]);
1480 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1481 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1484 secrets.push([0; 32]);
1485 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1486 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap();
1489 secrets.push([0; 32]);
1490 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
1491 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone(), None).unwrap();
1494 secrets.push([0; 32]);
1495 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1496 assert_eq!(monitor.provide_secret(281474976710650, secrets.last().unwrap().clone(), None).unwrap_err().err,
1497 "Previous secret did not match new one");
1501 // insert_secret #6 incorrect (5 derived from incorrect)
1502 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1505 secrets.push([0; 32]);
1506 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1507 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1510 secrets.push([0; 32]);
1511 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1512 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1515 secrets.push([0; 32]);
1516 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1517 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1520 secrets.push([0; 32]);
1521 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1522 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap();
1525 secrets.push([0; 32]);
1526 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
1527 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone(), None).unwrap();
1530 secrets.push([0; 32]);
1531 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("b7e76a83668bde38b373970155c868a653304308f9896692f904a23731224bb1").unwrap());
1532 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone(), None).unwrap();
1535 secrets.push([0; 32]);
1536 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1537 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone(), None).unwrap();
1540 secrets.push([0; 32]);
1541 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1542 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone(), None).unwrap_err().err,
1543 "Previous secret did not match new one");
1547 // insert_secret #7 incorrect
1548 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1551 secrets.push([0; 32]);
1552 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1553 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1556 secrets.push([0; 32]);
1557 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1558 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1561 secrets.push([0; 32]);
1562 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1563 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1566 secrets.push([0; 32]);
1567 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1568 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap();
1571 secrets.push([0; 32]);
1572 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1573 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone(), None).unwrap();
1576 secrets.push([0; 32]);
1577 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1578 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone(), None).unwrap();
1581 secrets.push([0; 32]);
1582 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("e7971de736e01da8ed58b94c2fc216cb1dca9e326f3a96e7194fe8ea8af6c0a3").unwrap());
1583 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone(), None).unwrap();
1586 secrets.push([0; 32]);
1587 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1588 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone(), None).unwrap_err().err,
1589 "Previous secret did not match new one");
1593 // insert_secret #8 incorrect
1594 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1597 secrets.push([0; 32]);
1598 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1599 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone(), None).unwrap();
1602 secrets.push([0; 32]);
1603 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1604 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone(), None).unwrap();
1607 secrets.push([0; 32]);
1608 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1609 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone(), None).unwrap();
1612 secrets.push([0; 32]);
1613 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1614 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone(), None).unwrap();
1617 secrets.push([0; 32]);
1618 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1619 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone(), None).unwrap();
1622 secrets.push([0; 32]);
1623 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1624 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone(), None).unwrap();
1627 secrets.push([0; 32]);
1628 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1629 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone(), None).unwrap();
1632 secrets.push([0; 32]);
1633 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex_bytes("a7efbc61aac46d34f77778bac22c8a20c6a46ca460addc49009bda875ec88fa4").unwrap());
1634 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone(), None).unwrap_err().err,
1635 "Previous secret did not match new one");
1640 fn test_prune_preimages() {
1641 let secp_ctx = Secp256k1::new();
1642 let dummy_sig = Signature::from_der(&secp_ctx, &hex_bytes("3045022100fa86fa9a36a8cd6a7bb8f06a541787d51371d067951a9461d5404de6b928782e02201c8b7c334c10aed8976a3a465be9a28abff4cb23acbf00022295b378ce1fa3cd").unwrap()[..]).unwrap();
1644 macro_rules! dummy_keys {
1647 per_commitment_point: PublicKey::new(),
1648 revocation_key: PublicKey::new(),
1649 a_htlc_key: PublicKey::new(),
1650 b_htlc_key: PublicKey::new(),
1651 a_delayed_payment_key: PublicKey::new(),
1652 b_payment_key: PublicKey::new(),
1656 let dummy_tx = Transaction { version: 0, lock_time: 0, input: Vec::new(), output: Vec::new() };
1658 let mut preimages = Vec::new();
1660 let mut rng = thread_rng();
1662 let mut preimage = [0; 32];
1663 rng.fill_bytes(&mut preimage);
1664 let mut sha = Sha256::new();
1665 sha.input(&preimage);
1666 let mut hash = [0; 32];
1667 sha.result(&mut hash);
1668 preimages.push((preimage, hash));
1672 macro_rules! preimages_slice_to_htlc_outputs {
1673 ($preimages_slice: expr) => {
1675 let mut res = Vec::new();
1676 for (idx, preimage) in $preimages_slice.iter().enumerate() {
1677 res.push(HTLCOutputInCommitment {
1681 payment_hash: preimage.1.clone(),
1682 transaction_output_index: idx as u32,
1689 macro_rules! preimages_to_local_htlcs {
1690 ($preimages_slice: expr) => {
1692 let mut inp = preimages_slice_to_htlc_outputs!($preimages_slice);
1693 let res: Vec<_> = inp.drain(..).map(|e| { (e, dummy_sig.clone(), dummy_sig.clone()) }).collect();
1699 macro_rules! test_preimages_exist {
1700 ($preimages_slice: expr, $monitor: expr) => {
1701 for preimage in $preimages_slice {
1702 assert!($monitor.payment_preimages.contains_key(&preimage.1));
1707 // Prune with one old state and a local commitment tx holding a few overlaps with the
1709 let mut monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &PublicKey::new(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), 0, Script::new());
1710 monitor.set_their_to_self_delay(10);
1712 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..10]));
1713 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[5..15]), 281474976710655);
1714 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[15..20]), 281474976710654);
1715 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[17..20]), 281474976710653);
1716 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[18..20]), 281474976710652);
1717 for &(ref preimage, ref hash) in preimages.iter() {
1718 monitor.provide_payment_preimage(hash, preimage);
1721 // Now provide a secret, pruning preimages 10-15
1722 let mut secret = [0; 32];
1723 secret[0..32].clone_from_slice(&hex_bytes("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1724 monitor.provide_secret(281474976710655, secret.clone(), None).unwrap();
1725 assert_eq!(monitor.payment_preimages.len(), 15);
1726 test_preimages_exist!(&preimages[0..10], monitor);
1727 test_preimages_exist!(&preimages[15..20], monitor);
1729 // Now provide a further secret, pruning preimages 15-17
1730 secret[0..32].clone_from_slice(&hex_bytes("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1731 monitor.provide_secret(281474976710654, secret.clone(), None).unwrap();
1732 assert_eq!(monitor.payment_preimages.len(), 13);
1733 test_preimages_exist!(&preimages[0..10], monitor);
1734 test_preimages_exist!(&preimages[17..20], monitor);
1736 // Now update local commitment tx info, pruning only element 18 as we still care about the
1737 // previous commitment tx's preimages too
1738 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..5]));
1739 secret[0..32].clone_from_slice(&hex_bytes("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1740 monitor.provide_secret(281474976710653, secret.clone(), None).unwrap();
1741 assert_eq!(monitor.payment_preimages.len(), 12);
1742 test_preimages_exist!(&preimages[0..10], monitor);
1743 test_preimages_exist!(&preimages[18..20], monitor);
1745 // But if we do it again, we'll prune 5-10
1746 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..3]));
1747 secret[0..32].clone_from_slice(&hex_bytes("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1748 monitor.provide_secret(281474976710652, secret.clone(), None).unwrap();
1749 assert_eq!(monitor.payment_preimages.len(), 5);
1750 test_preimages_exist!(&preimages[0..5], monitor);
1753 // Further testing is done in the ChannelManager integration tests.