1 //! The logic to monitor for on-chain transactions and create the relevant claim responses lives
4 //! ChannelMonitor objects are generated by ChannelManager in response to relevant
5 //! messages/actions, and MUST be persisted to disk (and, preferably, remotely) before progress can
6 //! be made in responding to certain messages, see ManyChannelMonitor for more.
8 //! Note that ChannelMonitors are an important part of the lightning trust model and a copy of the
9 //! latest ChannelMonitor must always be actively monitoring for chain updates (and no out-of-date
10 //! ChannelMonitors should do so). Thus, if you're building rust-lightning into an HSM or other
11 //! security-domain-separated system design, you should consider having multiple paths for
12 //! ChannelMonitors to get out of the HSM and onto monitoring devices.
14 use bitcoin::blockdata::block::BlockHeader;
15 use bitcoin::blockdata::transaction::{TxIn,TxOut,SigHashType,Transaction};
16 use bitcoin::blockdata::transaction::OutPoint as BitcoinOutPoint;
17 use bitcoin::blockdata::script::{Script, Builder};
18 use bitcoin::blockdata::opcodes;
19 use bitcoin::consensus::encode::{self, Decodable, Encodable};
20 use bitcoin::util::hash::{Hash160, BitcoinHash,Sha256dHash};
21 use bitcoin::util::bip143;
23 use crypto::digest::Digest;
25 use secp256k1::{Secp256k1,Message,Signature};
26 use secp256k1::key::{SecretKey,PublicKey};
29 use ln::msgs::DecodeError;
31 use ln::chan_utils::HTLCOutputInCommitment;
32 use chain::chaininterface::{ChainListener, ChainWatchInterface, BroadcasterInterface};
33 use chain::transaction::OutPoint;
34 use chain::keysinterface::SpendableOutputDescriptor;
35 use util::logger::Logger;
36 use util::ser::{ReadableArgs, Readable, Writer, Writeable, WriterWriteAdaptor, U48};
37 use util::sha2::Sha256;
38 use util::{byte_utils, events};
40 use std::collections::HashMap;
41 use std::sync::{Arc,Mutex};
42 use std::{hash,cmp, mem};
44 /// An error enum representing a failure to persist a channel monitor update.
46 pub enum ChannelMonitorUpdateErr {
47 /// Used to indicate a temporary failure (eg connection to a watchtower failed, but is expected
48 /// to succeed at some point in the future).
50 /// Such a failure will "freeze" a channel, preventing us from revoking old states or
51 /// submitting new commitment transactions to the remote party.
52 /// ChannelManager::test_restore_channel_monitor can be used to retry the update(s) and restore
53 /// the channel to an operational state.
55 /// Note that continuing to operate when no copy of the updated ChannelMonitor could be
56 /// persisted is unsafe - if you failed to store the update on your own local disk you should
57 /// instead return PermanentFailure to force closure of the channel ASAP.
59 /// Even when a channel has been "frozen" updates to the ChannelMonitor can continue to occur
60 /// (eg if an inbound HTLC which we forwarded was claimed upstream resulting in us attempting
61 /// to claim it on this channel) and those updates must be applied wherever they can be. At
62 /// least one such updated ChannelMonitor must be persisted otherwise PermanentFailure should
63 /// be returned to get things on-chain ASAP using only the in-memory copy. Obviously updates to
64 /// the channel which would invalidate previous ChannelMonitors are not made when a channel has
67 /// Note that even if updates made after TemporaryFailure succeed you must still call
68 /// test_restore_channel_monitor to ensure you have the latest monitor and re-enable normal
69 /// channel operation.
71 /// Used to indicate no further channel monitor updates will be allowed (eg we've moved on to a
72 /// different watchtower and cannot update with all watchtowers that were previously informed
73 /// of this channel). This will force-close the channel in question.
77 /// General Err type for ChannelMonitor actions. Generally, this implies that the data provided is
78 /// inconsistent with the ChannelMonitor being called. eg for ChannelMonitor::insert_combine this
79 /// means you tried to merge two monitors for different channels or for a channel which was
80 /// restored from a backup and then generated new commitment updates.
81 /// Contains a human-readable error message.
83 pub struct MonitorUpdateError(pub &'static str);
85 /// Simple trait indicating ability to track a set of ChannelMonitors and multiplex events between
86 /// them. Generally should be implemented by keeping a local SimpleManyChannelMonitor and passing
87 /// events to it, while also taking any add_update_monitor events and passing them to some remote
90 /// Note that any updates to a channel's monitor *must* be applied to each instance of the
91 /// channel's monitor everywhere (including remote watchtowers) *before* this function returns. If
92 /// an update occurs and a remote watchtower is left with old state, it may broadcast transactions
93 /// which we have revoked, allowing our counterparty to claim all funds in the channel!
94 pub trait ManyChannelMonitor: Send + Sync {
95 /// Adds or updates a monitor for the given `funding_txo`.
97 /// Implementor must also ensure that the funding_txo outpoint is registered with any relevant
98 /// ChainWatchInterfaces such that the provided monitor receives block_connected callbacks with
100 fn add_update_monitor(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr>;
103 /// A simple implementation of a ManyChannelMonitor and ChainListener. Can be used to create a
104 /// watchtower or watch our own channels.
106 /// Note that you must provide your own key by which to refer to channels.
108 /// If you're accepting remote monitors (ie are implementing a watchtower), you must verify that
109 /// users cannot overwrite a given channel by providing a duplicate key. ie you should probably
110 /// index by a PublicKey which is required to sign any updates.
112 /// If you're using this for local monitoring of your own channels, you probably want to use
113 /// `OutPoint` as the key, which will give you a ManyChannelMonitor implementation.
114 pub struct SimpleManyChannelMonitor<Key> {
115 #[cfg(test)] // Used in ChannelManager tests to manipulate channels directly
116 pub monitors: Mutex<HashMap<Key, ChannelMonitor>>,
118 monitors: Mutex<HashMap<Key, ChannelMonitor>>,
119 chain_monitor: Arc<ChainWatchInterface>,
120 broadcaster: Arc<BroadcasterInterface>,
121 pending_events: Mutex<Vec<events::Event>>,
125 impl<Key : Send + cmp::Eq + hash::Hash> ChainListener for SimpleManyChannelMonitor<Key> {
126 fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], _indexes_of_txn_matched: &[u32]) {
127 let block_hash = header.bitcoin_hash();
128 let mut new_events: Vec<events::Event> = Vec::with_capacity(0);
130 let mut monitors = self.monitors.lock().unwrap();
131 for monitor in monitors.values_mut() {
132 let (txn_outputs, spendable_outputs) = monitor.block_connected(txn_matched, height, &block_hash, &*self.broadcaster);
133 if spendable_outputs.len() > 0 {
134 new_events.push(events::Event::SpendableOutputs {
135 outputs: spendable_outputs,
138 for (ref txid, ref outputs) in txn_outputs {
139 for (idx, output) in outputs.iter().enumerate() {
140 self.chain_monitor.install_watch_outpoint((txid.clone(), idx as u32), &output.script_pubkey);
145 let mut pending_events = self.pending_events.lock().unwrap();
146 pending_events.append(&mut new_events);
149 fn block_disconnected(&self, _: &BlockHeader) { }
152 impl<Key : Send + cmp::Eq + hash::Hash + 'static> SimpleManyChannelMonitor<Key> {
153 /// Creates a new object which can be used to monitor several channels given the chain
154 /// interface with which to register to receive notifications.
155 pub fn new(chain_monitor: Arc<ChainWatchInterface>, broadcaster: Arc<BroadcasterInterface>, logger: Arc<Logger>) -> Arc<SimpleManyChannelMonitor<Key>> {
156 let res = Arc::new(SimpleManyChannelMonitor {
157 monitors: Mutex::new(HashMap::new()),
160 pending_events: Mutex::new(Vec::new()),
163 let weak_res = Arc::downgrade(&res);
164 res.chain_monitor.register_listener(weak_res);
168 /// Adds or udpates the monitor which monitors the channel referred to by the given key.
169 pub fn add_update_monitor_by_key(&self, key: Key, monitor: ChannelMonitor) -> Result<(), MonitorUpdateError> {
170 let mut monitors = self.monitors.lock().unwrap();
171 match monitors.get_mut(&key) {
172 Some(orig_monitor) => {
173 log_trace!(self, "Updating Channel Monitor for channel {}", log_funding_option!(monitor.funding_txo));
174 return orig_monitor.insert_combine(monitor);
178 match &monitor.funding_txo {
180 log_trace!(self, "Got new Channel Monitor for no-funding-set channel (monitoring all txn!)");
181 self.chain_monitor.watch_all_txn()
183 &Some((ref outpoint, ref script)) => {
184 log_trace!(self, "Got new Channel Monitor for channel {}", log_bytes!(outpoint.to_channel_id()[..]));
185 self.chain_monitor.install_watch_tx(&outpoint.txid, script);
186 self.chain_monitor.install_watch_outpoint((outpoint.txid, outpoint.index as u32), script);
189 monitors.insert(key, monitor);
194 impl ManyChannelMonitor for SimpleManyChannelMonitor<OutPoint> {
195 fn add_update_monitor(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr> {
196 match self.add_update_monitor_by_key(funding_txo, monitor) {
198 Err(_) => Err(ChannelMonitorUpdateErr::PermanentFailure),
203 impl<Key : Send + cmp::Eq + hash::Hash> events::EventsProvider for SimpleManyChannelMonitor<Key> {
204 fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
205 let mut pending_events = self.pending_events.lock().unwrap();
206 let mut ret = Vec::new();
207 mem::swap(&mut ret, &mut *pending_events);
212 /// If an HTLC expires within this many blocks, don't try to claim it in a shared transaction,
213 /// instead claiming it in its own individual transaction.
214 const CLTV_SHARED_CLAIM_BUFFER: u32 = 12;
215 /// If an HTLC expires within this many blocks, force-close the channel to broadcast the
216 /// HTLC-Success transaction.
217 /// In other words, this is an upper bound on how many blocks we think it can take us to get a
218 /// transaction confirmed (and we use it in a few more, equivalent, places).
219 pub(crate) const CLTV_CLAIM_BUFFER: u32 = 6;
220 /// Number of blocks by which point we expect our counterparty to have seen new blocks on the
221 /// network and done a full update_fail_htlc/commitment_signed dance (+ we've updated all our
222 /// copies of ChannelMonitors, including watchtowers).
223 pub(crate) const HTLC_FAIL_TIMEOUT_BLOCKS: u32 = 3;
225 #[derive(Clone, PartialEq)]
228 revocation_base_key: SecretKey,
229 htlc_base_key: SecretKey,
230 delayed_payment_base_key: SecretKey,
231 payment_base_key: SecretKey,
232 shutdown_pubkey: PublicKey,
233 prev_latest_per_commitment_point: Option<PublicKey>,
234 latest_per_commitment_point: Option<PublicKey>,
237 revocation_base_key: PublicKey,
238 htlc_base_key: PublicKey,
239 sigs: HashMap<Sha256dHash, Signature>,
243 #[derive(Clone, PartialEq)]
244 struct LocalSignedTx {
245 /// txid of the transaction in tx, just used to make comparison faster
248 revocation_key: PublicKey,
249 a_htlc_key: PublicKey,
250 b_htlc_key: PublicKey,
251 delayed_payment_key: PublicKey,
253 htlc_outputs: Vec<(HTLCOutputInCommitment, Signature, Signature)>,
256 const SERIALIZATION_VERSION: u8 = 1;
257 const MIN_SERIALIZATION_VERSION: u8 = 1;
259 /// A ChannelMonitor handles chain events (blocks connected and disconnected) and generates
260 /// on-chain transactions to ensure no loss of funds occurs.
262 /// You MUST ensure that no ChannelMonitors for a given channel anywhere contain out-of-date
263 /// information and are actively monitoring the chain.
265 pub struct ChannelMonitor {
266 funding_txo: Option<(OutPoint, Script)>,
267 commitment_transaction_number_obscure_factor: u64,
269 key_storage: KeyStorage,
270 their_htlc_base_key: Option<PublicKey>,
271 their_delayed_payment_base_key: Option<PublicKey>,
272 // first is the idx of the first of the two revocation points
273 their_cur_revocation_points: Option<(u64, PublicKey, Option<PublicKey>)>,
275 our_to_self_delay: u16,
276 their_to_self_delay: Option<u16>,
278 old_secrets: [([u8; 32], u64); 49],
279 remote_claimable_outpoints: HashMap<Sha256dHash, Vec<HTLCOutputInCommitment>>,
280 /// We cannot identify HTLC-Success or HTLC-Timeout transactions by themselves on the chain.
281 /// Nor can we figure out their commitment numbers without the commitment transaction they are
282 /// spending. Thus, in order to claim them via revocation key, we track all the remote
283 /// commitment transactions which we find on-chain, mapping them to the commitment number which
284 /// can be used to derive the revocation key and claim the transactions.
285 remote_commitment_txn_on_chain: HashMap<Sha256dHash, (u64, Vec<Script>)>,
286 /// Cache used to make pruning of payment_preimages faster.
287 /// Maps payment_hash values to commitment numbers for remote transactions for non-revoked
288 /// remote transactions (ie should remain pretty small).
289 /// Serialized to disk but should generally not be sent to Watchtowers.
290 remote_hash_commitment_number: HashMap<[u8; 32], u64>,
292 // We store two local commitment transactions to avoid any race conditions where we may update
293 // some monitors (potentially on watchtowers) but then fail to update others, resulting in the
294 // various monitors for one channel being out of sync, and us broadcasting a local
295 // transaction for which we have deleted claim information on some watchtowers.
296 prev_local_signed_commitment_tx: Option<LocalSignedTx>,
297 current_local_signed_commitment_tx: Option<LocalSignedTx>,
299 // Used just for ChannelManager to make sure it has the latest channel data during
301 current_remote_commitment_number: u64,
303 payment_preimages: HashMap<[u8; 32], [u8; 32]>,
305 destination_script: Script,
307 // We simply modify last_block_hash in Channel's block_connected so that serialization is
308 // consistent but hopefully the users' copy handles block_connected in a consistent way.
309 // (we do *not*, however, update them in insert_combine to ensure any local user copies keep
310 // their last_block_hash from its state and not based on updated copies that didn't run through
311 // the full block_connected).
312 pub(crate) last_block_hash: Sha256dHash,
313 secp_ctx: Secp256k1<secp256k1::All>, //TODO: dedup this a bit...
317 #[cfg(any(test, feature = "fuzztarget"))]
318 /// Used only in testing and fuzztarget to check serialization roundtrips don't change the
319 /// underlying object
320 impl PartialEq for ChannelMonitor {
321 fn eq(&self, other: &Self) -> bool {
322 if self.funding_txo != other.funding_txo ||
323 self.commitment_transaction_number_obscure_factor != other.commitment_transaction_number_obscure_factor ||
324 self.key_storage != other.key_storage ||
325 self.their_htlc_base_key != other.their_htlc_base_key ||
326 self.their_delayed_payment_base_key != other.their_delayed_payment_base_key ||
327 self.their_cur_revocation_points != other.their_cur_revocation_points ||
328 self.our_to_self_delay != other.our_to_self_delay ||
329 self.their_to_self_delay != other.their_to_self_delay ||
330 self.remote_claimable_outpoints != other.remote_claimable_outpoints ||
331 self.remote_commitment_txn_on_chain != other.remote_commitment_txn_on_chain ||
332 self.remote_hash_commitment_number != other.remote_hash_commitment_number ||
333 self.prev_local_signed_commitment_tx != other.prev_local_signed_commitment_tx ||
334 self.current_remote_commitment_number != other.current_remote_commitment_number ||
335 self.current_local_signed_commitment_tx != other.current_local_signed_commitment_tx ||
336 self.payment_preimages != other.payment_preimages ||
337 self.destination_script != other.destination_script
341 for (&(ref secret, ref idx), &(ref o_secret, ref o_idx)) in self.old_secrets.iter().zip(other.old_secrets.iter()) {
342 if secret != o_secret || idx != o_idx {
351 impl ChannelMonitor {
352 pub(super) fn new(revocation_base_key: &SecretKey, delayed_payment_base_key: &SecretKey, htlc_base_key: &SecretKey, payment_base_key: &SecretKey, shutdown_pubkey: &PublicKey, our_to_self_delay: u16, destination_script: Script, logger: Arc<Logger>) -> ChannelMonitor {
355 commitment_transaction_number_obscure_factor: 0,
357 key_storage: KeyStorage::PrivMode {
358 revocation_base_key: revocation_base_key.clone(),
359 htlc_base_key: htlc_base_key.clone(),
360 delayed_payment_base_key: delayed_payment_base_key.clone(),
361 payment_base_key: payment_base_key.clone(),
362 shutdown_pubkey: shutdown_pubkey.clone(),
363 prev_latest_per_commitment_point: None,
364 latest_per_commitment_point: None,
366 their_htlc_base_key: None,
367 their_delayed_payment_base_key: None,
368 their_cur_revocation_points: None,
370 our_to_self_delay: our_to_self_delay,
371 their_to_self_delay: None,
373 old_secrets: [([0; 32], 1 << 48); 49],
374 remote_claimable_outpoints: HashMap::new(),
375 remote_commitment_txn_on_chain: HashMap::new(),
376 remote_hash_commitment_number: HashMap::new(),
378 prev_local_signed_commitment_tx: None,
379 current_local_signed_commitment_tx: None,
380 current_remote_commitment_number: 1 << 48,
382 payment_preimages: HashMap::new(),
383 destination_script: destination_script,
385 last_block_hash: Default::default(),
386 secp_ctx: Secp256k1::new(),
392 fn place_secret(idx: u64) -> u8 {
394 if idx & (1 << i) == (1 << i) {
402 fn derive_secret(secret: [u8; 32], bits: u8, idx: u64) -> [u8; 32] {
403 let mut res: [u8; 32] = secret;
405 let bitpos = bits - 1 - i;
406 if idx & (1 << bitpos) == (1 << bitpos) {
407 res[(bitpos / 8) as usize] ^= 1 << (bitpos & 7);
408 let mut sha = Sha256::new();
410 sha.result(&mut res);
416 /// Inserts a revocation secret into this channel monitor. Prunes old preimages if neither
417 /// needed by local commitment transactions HTCLs nor by remote ones. Unless we haven't already seen remote
418 /// commitment transaction's secret, they are de facto pruned (we can use revocation key).
419 pub(super) fn provide_secret(&mut self, idx: u64, secret: [u8; 32]) -> Result<(), MonitorUpdateError> {
420 let pos = ChannelMonitor::place_secret(idx);
422 let (old_secret, old_idx) = self.old_secrets[i as usize];
423 if ChannelMonitor::derive_secret(secret, pos, old_idx) != old_secret {
424 return Err(MonitorUpdateError("Previous secret did not match new one"));
427 self.old_secrets[pos as usize] = (secret, idx);
429 if !self.payment_preimages.is_empty() {
430 let local_signed_commitment_tx = self.current_local_signed_commitment_tx.as_ref().expect("Channel needs at least an initial commitment tx !");
431 let prev_local_signed_commitment_tx = self.prev_local_signed_commitment_tx.as_ref();
432 let min_idx = self.get_min_seen_secret();
433 let remote_hash_commitment_number = &mut self.remote_hash_commitment_number;
435 self.payment_preimages.retain(|&k, _| {
436 for &(ref htlc, _, _) in &local_signed_commitment_tx.htlc_outputs {
437 if k == htlc.payment_hash {
441 if let Some(prev_local_commitment_tx) = prev_local_signed_commitment_tx {
442 for &(ref htlc, _, _) in prev_local_commitment_tx.htlc_outputs.iter() {
443 if k == htlc.payment_hash {
448 let contains = if let Some(cn) = remote_hash_commitment_number.get(&k) {
455 remote_hash_commitment_number.remove(&k);
464 /// Informs this monitor of the latest remote (ie non-broadcastable) commitment transaction.
465 /// The monitor watches for it to be broadcasted and then uses the HTLC information (and
466 /// possibly future revocation/preimage information) to claim outputs where possible.
467 /// We cache also the mapping hash:commitment number to lighten pruning of old preimages by watchtowers.
468 pub(super) fn provide_latest_remote_commitment_tx_info(&mut self, unsigned_commitment_tx: &Transaction, htlc_outputs: Vec<HTLCOutputInCommitment>, commitment_number: u64, their_revocation_point: PublicKey) {
469 // TODO: Encrypt the htlc_outputs data with the single-hash of the commitment transaction
470 // so that a remote monitor doesn't learn anything unless there is a malicious close.
471 // (only maybe, sadly we cant do the same for local info, as we need to be aware of
473 for htlc in &htlc_outputs {
474 self.remote_hash_commitment_number.insert(htlc.payment_hash, commitment_number);
476 self.remote_claimable_outpoints.insert(unsigned_commitment_tx.txid(), htlc_outputs);
477 self.current_remote_commitment_number = commitment_number;
478 //TODO: Merge this into the other per-remote-transaction output storage stuff
479 match self.their_cur_revocation_points {
480 Some(old_points) => {
481 if old_points.0 == commitment_number + 1 {
482 self.their_cur_revocation_points = Some((old_points.0, old_points.1, Some(their_revocation_point)));
483 } else if old_points.0 == commitment_number + 2 {
484 if let Some(old_second_point) = old_points.2 {
485 self.their_cur_revocation_points = Some((old_points.0 - 1, old_second_point, Some(their_revocation_point)));
487 self.their_cur_revocation_points = Some((commitment_number, their_revocation_point, None));
490 self.their_cur_revocation_points = Some((commitment_number, their_revocation_point, None));
494 self.their_cur_revocation_points = Some((commitment_number, their_revocation_point, None));
499 /// Informs this monitor of the latest local (ie broadcastable) commitment transaction. The
500 /// monitor watches for timeouts and may broadcast it if we approach such a timeout. Thus, it
501 /// is important that any clones of this channel monitor (including remote clones) by kept
502 /// up-to-date as our local commitment transaction is updated.
503 /// Panics if set_their_to_self_delay has never been called.
504 /// Also update KeyStorage with latest local per_commitment_point to derive local_delayedkey in
505 /// case of onchain HTLC tx
506 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)>) {
507 assert!(self.their_to_self_delay.is_some());
508 self.prev_local_signed_commitment_tx = self.current_local_signed_commitment_tx.take();
509 self.current_local_signed_commitment_tx = Some(LocalSignedTx {
510 txid: signed_commitment_tx.txid(),
511 tx: signed_commitment_tx,
512 revocation_key: local_keys.revocation_key,
513 a_htlc_key: local_keys.a_htlc_key,
514 b_htlc_key: local_keys.b_htlc_key,
515 delayed_payment_key: local_keys.a_delayed_payment_key,
519 self.key_storage = if let KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key, ref delayed_payment_base_key, ref payment_base_key, ref shutdown_pubkey, ref latest_per_commitment_point, .. } = self.key_storage {
520 KeyStorage::PrivMode {
521 revocation_base_key: *revocation_base_key,
522 htlc_base_key: *htlc_base_key,
523 delayed_payment_base_key: *delayed_payment_base_key,
524 payment_base_key: *payment_base_key,
525 shutdown_pubkey: *shutdown_pubkey,
526 prev_latest_per_commitment_point: *latest_per_commitment_point,
527 latest_per_commitment_point: Some(local_keys.per_commitment_point),
529 } else { unimplemented!(); };
532 /// Provides a payment_hash->payment_preimage mapping. Will be automatically pruned when all
533 /// commitment_tx_infos which contain the payment hash have been revoked.
534 pub(super) fn provide_payment_preimage(&mut self, payment_hash: &[u8; 32], payment_preimage: &[u8; 32]) {
535 self.payment_preimages.insert(payment_hash.clone(), payment_preimage.clone());
538 /// Combines this ChannelMonitor with the information contained in the other ChannelMonitor.
539 /// After a successful call this ChannelMonitor is up-to-date and is safe to use to monitor the
540 /// chain for new blocks/transactions.
541 pub fn insert_combine(&mut self, mut other: ChannelMonitor) -> Result<(), MonitorUpdateError> {
542 if self.funding_txo.is_some() {
543 // We should be able to compare the entire funding_txo, but in fuzztarget its trivially
544 // easy to collide the funding_txo hash and have a different scriptPubKey.
545 if other.funding_txo.is_some() && other.funding_txo.as_ref().unwrap().0 != self.funding_txo.as_ref().unwrap().0 {
546 return Err(MonitorUpdateError("Funding transaction outputs are not identical!"));
549 self.funding_txo = other.funding_txo.take();
551 let other_min_secret = other.get_min_seen_secret();
552 let our_min_secret = self.get_min_seen_secret();
553 if our_min_secret > other_min_secret {
554 self.provide_secret(other_min_secret, other.get_secret(other_min_secret).unwrap())?;
556 if let Some(ref local_tx) = self.current_local_signed_commitment_tx {
557 if let Some(ref other_local_tx) = other.current_local_signed_commitment_tx {
558 let our_commitment_number = 0xffffffffffff - ((((local_tx.tx.input[0].sequence as u64 & 0xffffff) << 3*8) | (local_tx.tx.lock_time as u64 & 0xffffff)) ^ self.commitment_transaction_number_obscure_factor);
559 let other_commitment_number = 0xffffffffffff - ((((other_local_tx.tx.input[0].sequence as u64 & 0xffffff) << 3*8) | (other_local_tx.tx.lock_time as u64 & 0xffffff)) ^ other.commitment_transaction_number_obscure_factor);
560 if our_commitment_number >= other_commitment_number {
561 self.key_storage = other.key_storage;
565 // TODO: We should use current_remote_commitment_number and the commitment number out of
566 // local transactions to decide how to merge
567 if our_min_secret >= other_min_secret {
568 self.their_cur_revocation_points = other.their_cur_revocation_points;
569 for (txid, htlcs) in other.remote_claimable_outpoints.drain() {
570 self.remote_claimable_outpoints.insert(txid, htlcs);
572 if let Some(local_tx) = other.prev_local_signed_commitment_tx {
573 self.prev_local_signed_commitment_tx = Some(local_tx);
575 if let Some(local_tx) = other.current_local_signed_commitment_tx {
576 self.current_local_signed_commitment_tx = Some(local_tx);
578 self.payment_preimages = other.payment_preimages;
581 self.current_remote_commitment_number = cmp::min(self.current_remote_commitment_number, other.current_remote_commitment_number);
585 /// Panics if commitment_transaction_number_obscure_factor doesn't fit in 48 bits
586 pub(super) fn set_commitment_obscure_factor(&mut self, commitment_transaction_number_obscure_factor: u64) {
587 assert!(commitment_transaction_number_obscure_factor < (1 << 48));
588 self.commitment_transaction_number_obscure_factor = commitment_transaction_number_obscure_factor;
591 /// Allows this monitor to scan only for transactions which are applicable. Note that this is
592 /// optional, without it this monitor cannot be used in an SPV client, but you may wish to
593 /// avoid this (or call unset_funding_info) on a monitor you wish to send to a watchtower as it
594 /// provides slightly better privacy.
595 /// It's the responsibility of the caller to register outpoint and script with passing the former
596 /// value as key to add_update_monitor.
597 pub(super) fn set_funding_info(&mut self, funding_info: (OutPoint, Script)) {
598 self.funding_txo = Some(funding_info);
601 /// We log these base keys at channel opening to being able to rebuild redeemscript in case of leaked revoked commit tx
602 pub(super) fn set_their_base_keys(&mut self, their_htlc_base_key: &PublicKey, their_delayed_payment_base_key: &PublicKey) {
603 self.their_htlc_base_key = Some(their_htlc_base_key.clone());
604 self.their_delayed_payment_base_key = Some(their_delayed_payment_base_key.clone());
607 pub(super) fn set_their_to_self_delay(&mut self, their_to_self_delay: u16) {
608 self.their_to_self_delay = Some(their_to_self_delay);
611 pub(super) fn unset_funding_info(&mut self) {
612 self.funding_txo = None;
615 /// Gets the funding transaction outpoint of the channel this ChannelMonitor is monitoring for.
616 pub fn get_funding_txo(&self) -> Option<OutPoint> {
617 match self.funding_txo {
618 Some((outpoint, _)) => Some(outpoint),
623 /// Gets the sets of all outpoints which this ChannelMonitor expects to hear about spends of.
624 /// Generally useful when deserializing as during normal operation the return values of
625 /// block_connected are sufficient to ensure all relevant outpoints are being monitored (note
626 /// that the get_funding_txo outpoint and transaction must also be monitored for!).
627 pub fn get_monitored_outpoints(&self) -> Vec<(Sha256dHash, u32, &Script)> {
628 let mut res = Vec::with_capacity(self.remote_commitment_txn_on_chain.len() * 2);
629 for (ref txid, &(_, ref outputs)) in self.remote_commitment_txn_on_chain.iter() {
630 for (idx, output) in outputs.iter().enumerate() {
631 res.push(((*txid).clone(), idx as u32, output));
637 /// Serializes into a vec, with various modes for the exposed pub fns
638 fn write<W: Writer>(&self, writer: &mut W, for_local_storage: bool) -> Result<(), ::std::io::Error> {
639 //TODO: We still write out all the serialization here manually instead of using the fancy
640 //serialization framework we have, we should migrate things over to it.
641 writer.write_all(&[SERIALIZATION_VERSION; 1])?;
642 writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
644 match &self.funding_txo {
645 &Some((ref outpoint, ref script)) => {
646 writer.write_all(&outpoint.txid[..])?;
647 writer.write_all(&byte_utils::be16_to_array(outpoint.index))?;
648 script.write(writer)?;
651 // We haven't even been initialized...not sure why anyone is serializing us, but
652 // not much to give them.
657 // Set in initial Channel-object creation, so should always be set by now:
658 U48(self.commitment_transaction_number_obscure_factor).write(writer)?;
660 match self.key_storage {
661 KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key, ref delayed_payment_base_key, ref payment_base_key, ref shutdown_pubkey, ref prev_latest_per_commitment_point, ref latest_per_commitment_point } => {
662 writer.write_all(&[0; 1])?;
663 writer.write_all(&revocation_base_key[..])?;
664 writer.write_all(&htlc_base_key[..])?;
665 writer.write_all(&delayed_payment_base_key[..])?;
666 writer.write_all(&payment_base_key[..])?;
667 writer.write_all(&shutdown_pubkey.serialize())?;
668 if let Some(ref prev_latest_per_commitment_point) = *prev_latest_per_commitment_point {
669 writer.write_all(&[1; 1])?;
670 writer.write_all(&prev_latest_per_commitment_point.serialize())?;
672 writer.write_all(&[0; 1])?;
674 if let Some(ref latest_per_commitment_point) = *latest_per_commitment_point {
675 writer.write_all(&[1; 1])?;
676 writer.write_all(&latest_per_commitment_point.serialize())?;
678 writer.write_all(&[0; 1])?;
682 KeyStorage::SigsMode { .. } => unimplemented!(),
685 writer.write_all(&self.their_htlc_base_key.as_ref().unwrap().serialize())?;
686 writer.write_all(&self.their_delayed_payment_base_key.as_ref().unwrap().serialize())?;
688 match self.their_cur_revocation_points {
689 Some((idx, pubkey, second_option)) => {
690 writer.write_all(&byte_utils::be48_to_array(idx))?;
691 writer.write_all(&pubkey.serialize())?;
692 match second_option {
693 Some(second_pubkey) => {
694 writer.write_all(&second_pubkey.serialize())?;
697 writer.write_all(&[0; 33])?;
702 writer.write_all(&byte_utils::be48_to_array(0))?;
706 writer.write_all(&byte_utils::be16_to_array(self.our_to_self_delay))?;
707 writer.write_all(&byte_utils::be16_to_array(self.their_to_self_delay.unwrap()))?;
709 for &(ref secret, ref idx) in self.old_secrets.iter() {
710 writer.write_all(secret)?;
711 writer.write_all(&byte_utils::be64_to_array(*idx))?;
714 macro_rules! serialize_htlc_in_commitment {
715 ($htlc_output: expr) => {
716 writer.write_all(&[$htlc_output.offered as u8; 1])?;
717 writer.write_all(&byte_utils::be64_to_array($htlc_output.amount_msat))?;
718 writer.write_all(&byte_utils::be32_to_array($htlc_output.cltv_expiry))?;
719 writer.write_all(&$htlc_output.payment_hash)?;
720 writer.write_all(&byte_utils::be32_to_array($htlc_output.transaction_output_index))?;
724 writer.write_all(&byte_utils::be64_to_array(self.remote_claimable_outpoints.len() as u64))?;
725 for (ref txid, ref htlc_outputs) in self.remote_claimable_outpoints.iter() {
726 writer.write_all(&txid[..])?;
727 writer.write_all(&byte_utils::be64_to_array(htlc_outputs.len() as u64))?;
728 for htlc_output in htlc_outputs.iter() {
729 serialize_htlc_in_commitment!(htlc_output);
733 writer.write_all(&byte_utils::be64_to_array(self.remote_commitment_txn_on_chain.len() as u64))?;
734 for (ref txid, &(commitment_number, ref txouts)) in self.remote_commitment_txn_on_chain.iter() {
735 writer.write_all(&txid[..])?;
736 writer.write_all(&byte_utils::be48_to_array(commitment_number))?;
737 (txouts.len() as u64).write(writer)?;
738 for script in txouts.iter() {
739 script.write(writer)?;
743 if for_local_storage {
744 writer.write_all(&byte_utils::be64_to_array(self.remote_hash_commitment_number.len() as u64))?;
745 for (ref payment_hash, commitment_number) in self.remote_hash_commitment_number.iter() {
746 writer.write_all(*payment_hash)?;
747 writer.write_all(&byte_utils::be48_to_array(*commitment_number))?;
750 writer.write_all(&byte_utils::be64_to_array(0))?;
753 macro_rules! serialize_local_tx {
754 ($local_tx: expr) => {
755 if let Err(e) = $local_tx.tx.consensus_encode(&mut WriterWriteAdaptor(writer)) {
757 encode::Error::Io(e) => return Err(e),
758 _ => panic!("local tx must have been well-formed!"),
762 writer.write_all(&$local_tx.revocation_key.serialize())?;
763 writer.write_all(&$local_tx.a_htlc_key.serialize())?;
764 writer.write_all(&$local_tx.b_htlc_key.serialize())?;
765 writer.write_all(&$local_tx.delayed_payment_key.serialize())?;
767 writer.write_all(&byte_utils::be64_to_array($local_tx.feerate_per_kw))?;
768 writer.write_all(&byte_utils::be64_to_array($local_tx.htlc_outputs.len() as u64))?;
769 for &(ref htlc_output, ref their_sig, ref our_sig) in $local_tx.htlc_outputs.iter() {
770 serialize_htlc_in_commitment!(htlc_output);
771 writer.write_all(&their_sig.serialize_compact(&self.secp_ctx))?;
772 writer.write_all(&our_sig.serialize_compact(&self.secp_ctx))?;
777 if let Some(ref prev_local_tx) = self.prev_local_signed_commitment_tx {
778 writer.write_all(&[1; 1])?;
779 serialize_local_tx!(prev_local_tx);
781 writer.write_all(&[0; 1])?;
784 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
785 writer.write_all(&[1; 1])?;
786 serialize_local_tx!(cur_local_tx);
788 writer.write_all(&[0; 1])?;
791 if for_local_storage {
792 writer.write_all(&byte_utils::be48_to_array(self.current_remote_commitment_number))?;
794 writer.write_all(&byte_utils::be48_to_array(0))?;
797 writer.write_all(&byte_utils::be64_to_array(self.payment_preimages.len() as u64))?;
798 for payment_preimage in self.payment_preimages.values() {
799 writer.write_all(payment_preimage)?;
802 self.last_block_hash.write(writer)?;
803 self.destination_script.write(writer)?;
808 /// Writes this monitor into the given writer, suitable for writing to disk.
810 /// Note that the deserializer is only implemented for (Sha256dHash, ChannelMonitor), which
811 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
812 /// the "reorg path" (ie not just starting at the same height but starting at the highest
813 /// common block that appears on your best chain as well as on the chain which contains the
814 /// last block hash returned) upon deserializing the object!
815 pub fn write_for_disk<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
816 self.write(writer, true)
819 /// Encodes this monitor into the given writer, suitable for sending to a remote watchtower
821 /// Note that the deserializer is only implemented for (Sha256dHash, ChannelMonitor), which
822 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
823 /// the "reorg path" (ie not just starting at the same height but starting at the highest
824 /// common block that appears on your best chain as well as on the chain which contains the
825 /// last block hash returned) upon deserializing the object!
826 pub fn write_for_watchtower<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
827 self.write(writer, false)
830 //TODO: Functions to serialize/deserialize (with different forms depending on which information
831 //we want to leave out (eg funding_txo, etc).
833 /// Can only fail if idx is < get_min_seen_secret
834 pub(super) fn get_secret(&self, idx: u64) -> Option<[u8; 32]> {
835 for i in 0..self.old_secrets.len() {
836 if (idx & (!((1 << i) - 1))) == self.old_secrets[i].1 {
837 return Some(ChannelMonitor::derive_secret(self.old_secrets[i].0, i as u8, idx))
840 assert!(idx < self.get_min_seen_secret());
844 pub(super) fn get_min_seen_secret(&self) -> u64 {
845 //TODO This can be optimized?
846 let mut min = 1 << 48;
847 for &(_, idx) in self.old_secrets.iter() {
855 pub(super) fn get_cur_remote_commitment_number(&self) -> u64 {
856 self.current_remote_commitment_number
859 pub(super) fn get_cur_local_commitment_number(&self) -> u64 {
860 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
861 0xffff_ffff_ffff - ((((local_tx.tx.input[0].sequence as u64 & 0xffffff) << 3*8) | (local_tx.tx.lock_time as u64 & 0xffffff)) ^ self.commitment_transaction_number_obscure_factor)
862 } else { 0xffff_ffff_ffff }
865 /// Attempts to claim a remote commitment transaction's outputs using the revocation key and
866 /// data in remote_claimable_outpoints. Will directly claim any HTLC outputs which expire at a
867 /// height > height + CLTV_SHARED_CLAIM_BUFFER. In any case, will install monitoring for
868 /// HTLC-Success/HTLC-Timeout transactions.
869 fn check_spend_remote_transaction(&mut self, tx: &Transaction, height: u32) -> (Vec<Transaction>, (Sha256dHash, Vec<TxOut>), Vec<SpendableOutputDescriptor>) {
870 // Most secp and related errors trying to create keys means we have no hope of constructing
871 // a spend transaction...so we return no transactions to broadcast
872 let mut txn_to_broadcast = Vec::new();
873 let mut watch_outputs = Vec::new();
874 let mut spendable_outputs = Vec::new();
876 let commitment_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers!
877 let per_commitment_option = self.remote_claimable_outpoints.get(&commitment_txid);
879 macro_rules! ignore_error {
880 ( $thing : expr ) => {
883 Err(_) => return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs)
888 let commitment_number = 0xffffffffffff - ((((tx.input[0].sequence as u64 & 0xffffff) << 3*8) | (tx.lock_time as u64 & 0xffffff)) ^ self.commitment_transaction_number_obscure_factor);
889 if commitment_number >= self.get_min_seen_secret() {
890 let secret = self.get_secret(commitment_number).unwrap();
891 let per_commitment_key = ignore_error!(SecretKey::from_slice(&self.secp_ctx, &secret));
892 let (revocation_pubkey, b_htlc_key, local_payment_key) = match self.key_storage {
893 KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key, ref payment_base_key, .. } => {
894 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key);
895 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key))),
896 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &PublicKey::from_secret_key(&self.secp_ctx, &htlc_base_key))),
897 Some(ignore_error!(chan_utils::derive_private_key(&self.secp_ctx, &per_commitment_point, &payment_base_key))))
899 KeyStorage::SigsMode { ref revocation_base_key, ref htlc_base_key, .. } => {
900 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key);
901 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &revocation_base_key)),
902 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &htlc_base_key)),
906 let delayed_key = ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key), &self.their_delayed_payment_base_key.unwrap()));
907 let a_htlc_key = match self.their_htlc_base_key {
908 None => return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs),
909 Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key), &their_htlc_base_key)),
912 let revokeable_redeemscript = chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.our_to_self_delay, &delayed_key);
913 let revokeable_p2wsh = revokeable_redeemscript.to_v0_p2wsh();
915 let local_payment_p2wpkh = if let Some(payment_key) = local_payment_key {
916 // Note that the Network here is ignored as we immediately drop the address for the
917 // script_pubkey version.
918 let payment_hash160 = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &payment_key).serialize());
919 Some(Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&payment_hash160[..]).into_script())
922 let mut total_value = 0;
923 let mut values = Vec::new();
924 let mut inputs = Vec::new();
925 let mut htlc_idxs = Vec::new();
927 for (idx, outp) in tx.output.iter().enumerate() {
928 if outp.script_pubkey == revokeable_p2wsh {
930 previous_output: BitcoinOutPoint {
931 txid: commitment_txid,
934 script_sig: Script::new(),
935 sequence: 0xfffffffd,
938 htlc_idxs.push(None);
939 values.push(outp.value);
940 total_value += outp.value;
941 } else if Some(&outp.script_pubkey) == local_payment_p2wpkh.as_ref() {
942 spendable_outputs.push(SpendableOutputDescriptor::DynamicOutputP2WPKH {
943 outpoint: BitcoinOutPoint { txid: commitment_txid, vout: idx as u32 },
944 key: local_payment_key.unwrap(),
945 output: outp.clone(),
950 macro_rules! sign_input {
951 ($sighash_parts: expr, $input: expr, $htlc_idx: expr, $amount: expr) => {
953 let (sig, redeemscript) = match self.key_storage {
954 KeyStorage::PrivMode { ref revocation_base_key, .. } => {
955 let redeemscript = if $htlc_idx.is_none() { revokeable_redeemscript.clone() } else {
956 let htlc = &per_commitment_option.unwrap()[$htlc_idx.unwrap()];
957 chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey)
959 let sighash = ignore_error!(Message::from_slice(&$sighash_parts.sighash_all(&$input, &redeemscript, $amount)[..]));
960 let revocation_key = ignore_error!(chan_utils::derive_private_revocation_key(&self.secp_ctx, &per_commitment_key, &revocation_base_key));
961 (self.secp_ctx.sign(&sighash, &revocation_key), redeemscript)
963 KeyStorage::SigsMode { .. } => {
967 $input.witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
968 $input.witness[0].push(SigHashType::All as u8);
969 if $htlc_idx.is_none() {
970 $input.witness.push(vec!(1));
972 $input.witness.push(revocation_pubkey.serialize().to_vec());
974 $input.witness.push(redeemscript.into_bytes());
979 if let Some(per_commitment_data) = per_commitment_option {
980 inputs.reserve_exact(per_commitment_data.len());
982 for (idx, htlc) in per_commitment_data.iter().enumerate() {
983 let expected_script = chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey);
984 if htlc.transaction_output_index as usize >= tx.output.len() ||
985 tx.output[htlc.transaction_output_index as usize].value != htlc.amount_msat / 1000 ||
986 tx.output[htlc.transaction_output_index as usize].script_pubkey != expected_script.to_v0_p2wsh() {
987 return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs); // Corrupted per_commitment_data, fuck this user
990 previous_output: BitcoinOutPoint {
991 txid: commitment_txid,
992 vout: 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);
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 watch_outputs.append(&mut tx.output.clone());
1023 self.remote_commitment_txn_on_chain.insert(commitment_txid, (commitment_number, tx.output.iter().map(|output| { output.script_pubkey.clone() }).collect()));
1025 if inputs.is_empty() { return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs); } // 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 spendable_outputs.push(SpendableOutputDescriptor::StaticOutput {
1047 outpoint: BitcoinOutPoint { txid: spend_tx.txid(), vout: 0 },
1048 output: spend_tx.output[0].clone(),
1050 txn_to_broadcast.push(spend_tx);
1051 } else if let Some(per_commitment_data) = per_commitment_option {
1052 // While this isn't useful yet, there is a potential race where if a counterparty
1053 // revokes a state at the same time as the commitment transaction for that state is
1054 // confirmed, and the watchtower receives the block before the user, the user could
1055 // upload a new ChannelMonitor with the revocation secret but the watchtower has
1056 // already processed the block, resulting in the remote_commitment_txn_on_chain entry
1057 // not being generated by the above conditional. Thus, to be safe, we go ahead and
1059 watch_outputs.append(&mut tx.output.clone());
1060 self.remote_commitment_txn_on_chain.insert(commitment_txid, (commitment_number, tx.output.iter().map(|output| { output.script_pubkey.clone() }).collect()));
1062 if let Some(revocation_points) = self.their_cur_revocation_points {
1063 let revocation_point_option =
1064 if revocation_points.0 == commitment_number { Some(&revocation_points.1) }
1065 else if let Some(point) = revocation_points.2.as_ref() {
1066 if revocation_points.0 == commitment_number + 1 { Some(point) } else { None }
1068 if let Some(revocation_point) = revocation_point_option {
1069 let (revocation_pubkey, b_htlc_key) = match self.key_storage {
1070 KeyStorage::PrivMode { ref revocation_base_key, ref htlc_base_key, .. } => {
1071 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, revocation_point, &PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key))),
1072 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &PublicKey::from_secret_key(&self.secp_ctx, &htlc_base_key))))
1074 KeyStorage::SigsMode { ref revocation_base_key, ref htlc_base_key, .. } => {
1075 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, revocation_point, &revocation_base_key)),
1076 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &htlc_base_key)))
1079 let a_htlc_key = match self.their_htlc_base_key {
1080 None => return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs),
1081 Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &their_htlc_base_key)),
1084 for (idx, outp) in tx.output.iter().enumerate() {
1085 if outp.script_pubkey.is_v0_p2wpkh() {
1086 match self.key_storage {
1087 KeyStorage::PrivMode { ref payment_base_key, .. } => {
1088 if let Ok(local_key) = chan_utils::derive_private_key(&self.secp_ctx, &revocation_point, &payment_base_key) {
1089 spendable_outputs.push(SpendableOutputDescriptor::DynamicOutputP2WPKH {
1090 outpoint: BitcoinOutPoint { txid: commitment_txid, vout: idx as u32 },
1092 output: outp.clone(),
1096 KeyStorage::SigsMode { .. } => {}
1098 break; // Only to_remote ouput is claimable
1102 let mut total_value = 0;
1103 let mut values = Vec::new();
1104 let mut inputs = Vec::new();
1106 macro_rules! sign_input {
1107 ($sighash_parts: expr, $input: expr, $amount: expr, $preimage: expr) => {
1109 let (sig, redeemscript) = match self.key_storage {
1110 KeyStorage::PrivMode { ref htlc_base_key, .. } => {
1111 let htlc = &per_commitment_option.unwrap()[$input.sequence as usize];
1112 let redeemscript = chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey);
1113 let sighash = ignore_error!(Message::from_slice(&$sighash_parts.sighash_all(&$input, &redeemscript, $amount)[..]));
1114 let htlc_key = ignore_error!(chan_utils::derive_private_key(&self.secp_ctx, revocation_point, &htlc_base_key));
1115 (self.secp_ctx.sign(&sighash, &htlc_key), redeemscript)
1117 KeyStorage::SigsMode { .. } => {
1121 $input.witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
1122 $input.witness[0].push(SigHashType::All as u8);
1123 $input.witness.push($preimage);
1124 $input.witness.push(redeemscript.into_bytes());
1129 for (idx, htlc) in per_commitment_data.iter().enumerate() {
1130 if let Some(payment_preimage) = self.payment_preimages.get(&htlc.payment_hash) {
1132 previous_output: BitcoinOutPoint {
1133 txid: commitment_txid,
1134 vout: htlc.transaction_output_index,
1136 script_sig: Script::new(),
1137 sequence: idx as u32, // reset to 0xfffffffd in sign_input
1138 witness: Vec::new(),
1140 if htlc.cltv_expiry > height + CLTV_SHARED_CLAIM_BUFFER {
1142 values.push((tx.output[htlc.transaction_output_index as usize].value, payment_preimage));
1143 total_value += htlc.amount_msat / 1000;
1145 let mut single_htlc_tx = Transaction {
1149 output: vec!(TxOut {
1150 script_pubkey: self.destination_script.clone(),
1151 value: htlc.amount_msat / 1000, //TODO: - fee
1154 let sighash_parts = bip143::SighashComponents::new(&single_htlc_tx);
1155 sign_input!(sighash_parts, single_htlc_tx.input[0], htlc.amount_msat / 1000, payment_preimage.to_vec());
1156 spendable_outputs.push(SpendableOutputDescriptor::StaticOutput {
1157 outpoint: BitcoinOutPoint { txid: single_htlc_tx.txid(), vout: 0 },
1158 output: single_htlc_tx.output[0].clone(),
1160 txn_to_broadcast.push(single_htlc_tx);
1165 if inputs.is_empty() { return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs); } // Nothing to be done...probably a false positive/local tx
1167 let outputs = vec!(TxOut {
1168 script_pubkey: self.destination_script.clone(),
1169 value: total_value, //TODO: - fee
1171 let mut spend_tx = Transaction {
1178 let mut values_drain = values.drain(..);
1179 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1181 for input in spend_tx.input.iter_mut() {
1182 let value = values_drain.next().unwrap();
1183 sign_input!(sighash_parts, input, value.0, value.1.to_vec());
1186 spendable_outputs.push(SpendableOutputDescriptor::StaticOutput {
1187 outpoint: BitcoinOutPoint { txid: spend_tx.txid(), vout: 0 },
1188 output: spend_tx.output[0].clone(),
1190 txn_to_broadcast.push(spend_tx);
1195 (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs)
1198 /// Attempst to claim a remote HTLC-Success/HTLC-Timeout s outputs using the revocation key
1199 fn check_spend_remote_htlc(&self, tx: &Transaction, commitment_number: u64) -> (Option<Transaction>, Option<SpendableOutputDescriptor>) {
1200 if tx.input.len() != 1 || tx.output.len() != 1 {
1204 macro_rules! ignore_error {
1205 ( $thing : expr ) => {
1208 Err(_) => return (None, None)
1213 let secret = if let Some(secret) = self.get_secret(commitment_number) { secret } else { return (None, None); };
1214 let per_commitment_key = ignore_error!(SecretKey::from_slice(&self.secp_ctx, &secret));
1215 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key);
1216 let revocation_pubkey = match self.key_storage {
1217 KeyStorage::PrivMode { ref revocation_base_key, .. } => {
1218 ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key)))
1220 KeyStorage::SigsMode { ref revocation_base_key, .. } => {
1221 ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &revocation_base_key))
1224 let delayed_key = match self.their_delayed_payment_base_key {
1225 None => return (None, None),
1226 Some(their_delayed_payment_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &their_delayed_payment_base_key)),
1228 let redeemscript = chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.their_to_self_delay.unwrap(), &delayed_key);
1229 let revokeable_p2wsh = redeemscript.to_v0_p2wsh();
1230 let htlc_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers!
1232 let mut inputs = Vec::new();
1235 if tx.output[0].script_pubkey == revokeable_p2wsh { //HTLC transactions have one txin, one txout
1237 previous_output: BitcoinOutPoint {
1241 script_sig: Script::new(),
1242 sequence: 0xfffffffd,
1243 witness: Vec::new(),
1245 amount = tx.output[0].value;
1248 if !inputs.is_empty() {
1249 let outputs = vec!(TxOut {
1250 script_pubkey: self.destination_script.clone(),
1251 value: amount, //TODO: - fee
1254 let mut spend_tx = Transaction {
1261 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1263 let sig = match self.key_storage {
1264 KeyStorage::PrivMode { ref revocation_base_key, .. } => {
1265 let sighash = ignore_error!(Message::from_slice(&sighash_parts.sighash_all(&spend_tx.input[0], &redeemscript, amount)[..]));
1266 let revocation_key = ignore_error!(chan_utils::derive_private_revocation_key(&self.secp_ctx, &per_commitment_key, &revocation_base_key));
1267 self.secp_ctx.sign(&sighash, &revocation_key)
1269 KeyStorage::SigsMode { .. } => {
1273 spend_tx.input[0].witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
1274 spend_tx.input[0].witness[0].push(SigHashType::All as u8);
1275 spend_tx.input[0].witness.push(vec!(1));
1276 spend_tx.input[0].witness.push(redeemscript.into_bytes());
1278 let outpoint = BitcoinOutPoint { txid: spend_tx.txid(), vout: 0 };
1279 let output = spend_tx.output[0].clone();
1280 (Some(spend_tx), Some(SpendableOutputDescriptor::StaticOutput { outpoint, output }))
1281 } else { (None, None) }
1284 fn broadcast_by_local_state(&self, local_tx: &LocalSignedTx, per_commitment_point: &Option<PublicKey>, delayed_payment_base_key: &Option<SecretKey>) -> (Vec<Transaction>, Vec<SpendableOutputDescriptor>) {
1285 let mut res = Vec::with_capacity(local_tx.htlc_outputs.len());
1286 let mut spendable_outputs = Vec::with_capacity(local_tx.htlc_outputs.len());
1288 macro_rules! add_dynamic_output {
1289 ($father_tx: expr, $vout: expr) => {
1290 if let Some(ref per_commitment_point) = *per_commitment_point {
1291 if let Some(ref delayed_payment_base_key) = *delayed_payment_base_key {
1292 if let Ok(local_delayedkey) = chan_utils::derive_private_key(&self.secp_ctx, per_commitment_point, delayed_payment_base_key) {
1293 spendable_outputs.push(SpendableOutputDescriptor::DynamicOutputP2WSH {
1294 outpoint: BitcoinOutPoint { txid: $father_tx.txid(), vout: $vout },
1295 key: local_delayedkey,
1296 witness_script: chan_utils::get_revokeable_redeemscript(&local_tx.revocation_key, self.our_to_self_delay, &local_tx.delayed_payment_key),
1297 to_self_delay: self.our_to_self_delay,
1298 output: $father_tx.output[$vout as usize].clone(),
1307 let redeemscript = chan_utils::get_revokeable_redeemscript(&local_tx.revocation_key, self.their_to_self_delay.unwrap(), &local_tx.delayed_payment_key);
1308 let revokeable_p2wsh = redeemscript.to_v0_p2wsh();
1309 for (idx, output) in local_tx.tx.output.iter().enumerate() {
1310 if output.script_pubkey == revokeable_p2wsh {
1311 add_dynamic_output!(local_tx.tx, idx as u32);
1316 for &(ref htlc, ref their_sig, ref our_sig) in local_tx.htlc_outputs.iter() {
1318 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);
1320 htlc_timeout_tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1322 htlc_timeout_tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1323 htlc_timeout_tx.input[0].witness[1].push(SigHashType::All as u8);
1324 htlc_timeout_tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1325 htlc_timeout_tx.input[0].witness[2].push(SigHashType::All as u8);
1327 htlc_timeout_tx.input[0].witness.push(Vec::new());
1328 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_bytes());
1330 add_dynamic_output!(htlc_timeout_tx, 0);
1331 res.push(htlc_timeout_tx);
1333 if let Some(payment_preimage) = self.payment_preimages.get(&htlc.payment_hash) {
1334 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);
1336 htlc_success_tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1338 htlc_success_tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1339 htlc_success_tx.input[0].witness[1].push(SigHashType::All as u8);
1340 htlc_success_tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1341 htlc_success_tx.input[0].witness[2].push(SigHashType::All as u8);
1343 htlc_success_tx.input[0].witness.push(payment_preimage.to_vec());
1344 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_bytes());
1346 add_dynamic_output!(htlc_success_tx, 0);
1347 res.push(htlc_success_tx);
1352 (res, spendable_outputs)
1355 /// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
1356 /// revoked using data in local_claimable_outpoints.
1357 /// Should not be used if check_spend_revoked_transaction succeeds.
1358 fn check_spend_local_transaction(&self, tx: &Transaction, _height: u32) -> (Vec<Transaction>, Vec<SpendableOutputDescriptor>) {
1359 let commitment_txid = tx.txid();
1360 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
1361 if local_tx.txid == commitment_txid {
1362 match self.key_storage {
1363 KeyStorage::PrivMode { ref delayed_payment_base_key, ref latest_per_commitment_point, .. } => {
1364 return self.broadcast_by_local_state(local_tx, latest_per_commitment_point, &Some(*delayed_payment_base_key));
1366 KeyStorage::SigsMode { .. } => {
1367 return self.broadcast_by_local_state(local_tx, &None, &None);
1372 if let &Some(ref local_tx) = &self.prev_local_signed_commitment_tx {
1373 if local_tx.txid == commitment_txid {
1374 match self.key_storage {
1375 KeyStorage::PrivMode { ref delayed_payment_base_key, ref prev_latest_per_commitment_point, .. } => {
1376 return self.broadcast_by_local_state(local_tx, prev_latest_per_commitment_point, &Some(*delayed_payment_base_key));
1378 KeyStorage::SigsMode { .. } => {
1379 return self.broadcast_by_local_state(local_tx, &None, &None);
1384 (Vec::new(), Vec::new())
1387 /// Generate a spendable output event when closing_transaction get registered onchain.
1388 fn check_spend_closing_transaction(&self, tx: &Transaction) -> Option<SpendableOutputDescriptor> {
1389 if tx.input[0].sequence == 0xFFFFFFFF && tx.input[0].witness.last().unwrap().len() == 71 {
1390 match self.key_storage {
1391 KeyStorage::PrivMode { ref shutdown_pubkey, .. } => {
1392 let our_channel_close_key_hash = Hash160::from_data(&shutdown_pubkey.serialize());
1393 let shutdown_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script();
1394 for (idx, output) in tx.output.iter().enumerate() {
1395 if shutdown_script == output.script_pubkey {
1396 return Some(SpendableOutputDescriptor::StaticOutput {
1397 outpoint: BitcoinOutPoint { txid: tx.txid(), vout: idx as u32 },
1398 output: output.clone(),
1403 KeyStorage::SigsMode { .. } => {
1404 //TODO: we need to ensure an offline client will generate the event when it
1405 // cames back online after only the watchtower saw the transaction
1412 /// Used by ChannelManager deserialization to broadcast the latest local state if it's copy of
1413 /// the Channel was out-of-date.
1414 pub(super) fn get_latest_local_commitment_txn(&self) -> Vec<Transaction> {
1415 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
1416 let mut res = vec![local_tx.tx.clone()];
1417 match self.key_storage {
1418 KeyStorage::PrivMode { ref delayed_payment_base_key, ref prev_latest_per_commitment_point, .. } => {
1419 res.append(&mut self.broadcast_by_local_state(local_tx, prev_latest_per_commitment_point, &Some(*delayed_payment_base_key)).0);
1421 _ => panic!("Can only broadcast by local channelmonitor"),
1429 fn block_connected(&mut self, txn_matched: &[&Transaction], height: u32, block_hash: &Sha256dHash, broadcaster: &BroadcasterInterface)-> (Vec<(Sha256dHash, Vec<TxOut>)>, Vec<SpendableOutputDescriptor>) {
1430 let mut watch_outputs = Vec::new();
1431 let mut spendable_outputs = Vec::new();
1432 for tx in txn_matched {
1433 if tx.input.len() == 1 {
1434 // Assuming our keys were not leaked (in which case we're screwed no matter what),
1435 // commitment transactions and HTLC transactions will all only ever have one input,
1436 // which is an easy way to filter out any potential non-matching txn for lazy
1438 let prevout = &tx.input[0].previous_output;
1439 let mut txn: Vec<Transaction> = Vec::new();
1440 if self.funding_txo.is_none() || (prevout.txid == self.funding_txo.as_ref().unwrap().0.txid && prevout.vout == self.funding_txo.as_ref().unwrap().0.index as u32) {
1441 let (remote_txn, new_outputs, mut spendable_output) = self.check_spend_remote_transaction(tx, height);
1443 spendable_outputs.append(&mut spendable_output);
1444 if !new_outputs.1.is_empty() {
1445 watch_outputs.push(new_outputs);
1448 let (remote_txn, mut outputs) = self.check_spend_local_transaction(tx, height);
1449 spendable_outputs.append(&mut outputs);
1452 if !self.funding_txo.is_none() && txn.is_empty() {
1453 if let Some(spendable_output) = self.check_spend_closing_transaction(tx) {
1454 spendable_outputs.push(spendable_output);
1458 if let Some(&(commitment_number, _)) = self.remote_commitment_txn_on_chain.get(&prevout.txid) {
1459 let (tx, spendable_output) = self.check_spend_remote_htlc(tx, commitment_number);
1460 if let Some(tx) = tx {
1463 if let Some(spendable_output) = spendable_output {
1464 spendable_outputs.push(spendable_output);
1468 for tx in txn.iter() {
1469 broadcaster.broadcast_transaction(tx);
1473 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
1474 if self.would_broadcast_at_height(height) {
1475 broadcaster.broadcast_transaction(&cur_local_tx.tx);
1476 match self.key_storage {
1477 KeyStorage::PrivMode { ref delayed_payment_base_key, ref latest_per_commitment_point, .. } => {
1478 let (txs, mut outputs) = self.broadcast_by_local_state(&cur_local_tx, latest_per_commitment_point, &Some(*delayed_payment_base_key));
1479 spendable_outputs.append(&mut outputs);
1481 broadcaster.broadcast_transaction(&tx);
1484 KeyStorage::SigsMode { .. } => {
1485 let (txs, mut outputs) = self.broadcast_by_local_state(&cur_local_tx, &None, &None);
1486 spendable_outputs.append(&mut outputs);
1488 broadcaster.broadcast_transaction(&tx);
1494 self.last_block_hash = block_hash.clone();
1495 (watch_outputs, spendable_outputs)
1498 pub(super) fn would_broadcast_at_height(&self, height: u32) -> bool {
1499 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
1500 for &(ref htlc, _, _) in cur_local_tx.htlc_outputs.iter() {
1501 // For inbound HTLCs which we know the preimage for, we have to ensure we hit the
1502 // chain with enough room to claim the HTLC without our counterparty being able to
1503 // time out the HTLC first.
1504 // For outbound HTLCs which our counterparty hasn't failed/claimed, our primary
1505 // concern is being able to claim the corresponding inbound HTLC (on another
1506 // channel) before it expires. In fact, we don't even really care if our
1507 // counterparty here claims such an outbound HTLC after it expired as long as we
1508 // can still claim the corresponding HTLC. Thus, to avoid needlessly hitting the
1509 // chain when our counterparty is waiting for expiration to off-chain fail an HTLC
1510 // we give ourselves a few blocks of headroom after expiration before going
1511 // on-chain for an expired HTLC.
1512 // Note that, to avoid a potential attack whereby a node delays claiming an HTLC
1513 // from us until we've reached the point where we go on-chain with the
1514 // corresponding inbound HTLC, we must ensure that outbound HTLCs go on chain at
1515 // least CLTV_CLAIM_BUFFER blocks prior to the inbound HTLC.
1516 // aka outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS == height - CLTV_CLAIM_BUFFER
1517 // inbound_cltv == height + CLTV_CLAIM_BUFFER
1518 // outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS + CLTV_CLAIM_BUFER <= inbound_cltv - CLTV_CLAIM_BUFFER
1519 // HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFER <= inbound_cltv - outbound_cltv
1520 // HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFER <= CLTV_EXPIRY_DELTA
1521 if ( htlc.offered && htlc.cltv_expiry + HTLC_FAIL_TIMEOUT_BLOCKS <= height) ||
1522 (!htlc.offered && htlc.cltv_expiry <= height + CLTV_CLAIM_BUFFER && self.payment_preimages.contains_key(&htlc.payment_hash)) {
1531 const MAX_ALLOC_SIZE: usize = 64*1024;
1533 impl<R: ::std::io::Read> ReadableArgs<R, Arc<Logger>> for (Sha256dHash, ChannelMonitor) {
1534 fn read(reader: &mut R, logger: Arc<Logger>) -> Result<Self, DecodeError> {
1535 let secp_ctx = Secp256k1::new();
1536 macro_rules! unwrap_obj {
1540 Err(_) => return Err(DecodeError::InvalidValue),
1545 let _ver: u8 = Readable::read(reader)?;
1546 let min_ver: u8 = Readable::read(reader)?;
1547 if min_ver > SERIALIZATION_VERSION {
1548 return Err(DecodeError::UnknownVersion);
1551 // Technically this can fail and serialize fail a round-trip, but only for serialization of
1552 // barely-init'd ChannelMonitors that we can't do anything with.
1553 let outpoint = OutPoint {
1554 txid: Readable::read(reader)?,
1555 index: Readable::read(reader)?,
1557 let funding_txo = Some((outpoint, Readable::read(reader)?));
1558 let commitment_transaction_number_obscure_factor = <U48 as Readable<R>>::read(reader)?.0;
1560 let key_storage = match <u8 as Readable<R>>::read(reader)? {
1562 let revocation_base_key = Readable::read(reader)?;
1563 let htlc_base_key = Readable::read(reader)?;
1564 let delayed_payment_base_key = Readable::read(reader)?;
1565 let payment_base_key = Readable::read(reader)?;
1566 let shutdown_pubkey = Readable::read(reader)?;
1567 let prev_latest_per_commitment_point = match <u8 as Readable<R>>::read(reader)? {
1569 1 => Some(Readable::read(reader)?),
1570 _ => return Err(DecodeError::InvalidValue),
1572 let latest_per_commitment_point = match <u8 as Readable<R>>::read(reader)? {
1574 1 => Some(Readable::read(reader)?),
1575 _ => return Err(DecodeError::InvalidValue),
1577 KeyStorage::PrivMode {
1578 revocation_base_key,
1580 delayed_payment_base_key,
1583 prev_latest_per_commitment_point,
1584 latest_per_commitment_point,
1587 _ => return Err(DecodeError::InvalidValue),
1590 let their_htlc_base_key = Some(Readable::read(reader)?);
1591 let their_delayed_payment_base_key = Some(Readable::read(reader)?);
1593 let their_cur_revocation_points = {
1594 let first_idx = <U48 as Readable<R>>::read(reader)?.0;
1598 let first_point = Readable::read(reader)?;
1599 let second_point_slice: [u8; 33] = Readable::read(reader)?;
1600 if second_point_slice[0..32] == [0; 32] && second_point_slice[32] == 0 {
1601 Some((first_idx, first_point, None))
1603 Some((first_idx, first_point, Some(unwrap_obj!(PublicKey::from_slice(&secp_ctx, &second_point_slice)))))
1608 let our_to_self_delay: u16 = Readable::read(reader)?;
1609 let their_to_self_delay: Option<u16> = Some(Readable::read(reader)?);
1611 let mut old_secrets = [([0; 32], 1 << 48); 49];
1612 for &mut (ref mut secret, ref mut idx) in old_secrets.iter_mut() {
1613 *secret = Readable::read(reader)?;
1614 *idx = Readable::read(reader)?;
1617 macro_rules! read_htlc_in_commitment {
1620 let offered: bool = Readable::read(reader)?;
1621 let amount_msat: u64 = Readable::read(reader)?;
1622 let cltv_expiry: u32 = Readable::read(reader)?;
1623 let payment_hash: [u8; 32] = Readable::read(reader)?;
1624 let transaction_output_index: u32 = Readable::read(reader)?;
1626 HTLCOutputInCommitment {
1627 offered, amount_msat, cltv_expiry, payment_hash, transaction_output_index
1633 let remote_claimable_outpoints_len: u64 = Readable::read(reader)?;
1634 let mut remote_claimable_outpoints = HashMap::with_capacity(cmp::min(remote_claimable_outpoints_len as usize, MAX_ALLOC_SIZE / 64));
1635 for _ in 0..remote_claimable_outpoints_len {
1636 let txid: Sha256dHash = Readable::read(reader)?;
1637 let outputs_count: u64 = Readable::read(reader)?;
1638 let mut outputs = Vec::with_capacity(cmp::min(outputs_count as usize, MAX_ALLOC_SIZE / 32));
1639 for _ in 0..outputs_count {
1640 outputs.push(read_htlc_in_commitment!());
1642 if let Some(_) = remote_claimable_outpoints.insert(txid, outputs) {
1643 return Err(DecodeError::InvalidValue);
1647 let remote_commitment_txn_on_chain_len: u64 = Readable::read(reader)?;
1648 let mut remote_commitment_txn_on_chain = HashMap::with_capacity(cmp::min(remote_commitment_txn_on_chain_len as usize, MAX_ALLOC_SIZE / 32));
1649 for _ in 0..remote_commitment_txn_on_chain_len {
1650 let txid: Sha256dHash = Readable::read(reader)?;
1651 let commitment_number = <U48 as Readable<R>>::read(reader)?.0;
1652 let outputs_count = <u64 as Readable<R>>::read(reader)?;
1653 let mut outputs = Vec::with_capacity(cmp::min(outputs_count as usize, MAX_ALLOC_SIZE / 8));
1654 for _ in 0..outputs_count {
1655 outputs.push(Readable::read(reader)?);
1657 if let Some(_) = remote_commitment_txn_on_chain.insert(txid, (commitment_number, outputs)) {
1658 return Err(DecodeError::InvalidValue);
1662 let remote_hash_commitment_number_len: u64 = Readable::read(reader)?;
1663 let mut remote_hash_commitment_number = HashMap::with_capacity(cmp::min(remote_hash_commitment_number_len as usize, MAX_ALLOC_SIZE / 32));
1664 for _ in 0..remote_hash_commitment_number_len {
1665 let txid: [u8; 32] = Readable::read(reader)?;
1666 let commitment_number = <U48 as Readable<R>>::read(reader)?.0;
1667 if let Some(_) = remote_hash_commitment_number.insert(txid, commitment_number) {
1668 return Err(DecodeError::InvalidValue);
1672 macro_rules! read_local_tx {
1675 let tx = match Transaction::consensus_decode(reader.by_ref()) {
1678 encode::Error::Io(ioe) => return Err(DecodeError::Io(ioe)),
1679 _ => return Err(DecodeError::InvalidValue),
1683 if tx.input.is_empty() {
1684 // Ensure tx didn't hit the 0-input ambiguity case.
1685 return Err(DecodeError::InvalidValue);
1688 let revocation_key = Readable::read(reader)?;
1689 let a_htlc_key = Readable::read(reader)?;
1690 let b_htlc_key = Readable::read(reader)?;
1691 let delayed_payment_key = Readable::read(reader)?;
1692 let feerate_per_kw: u64 = Readable::read(reader)?;
1694 let htlc_outputs_len: u64 = Readable::read(reader)?;
1695 let mut htlc_outputs = Vec::with_capacity(cmp::min(htlc_outputs_len as usize, MAX_ALLOC_SIZE / 128));
1696 for _ in 0..htlc_outputs_len {
1697 htlc_outputs.push((read_htlc_in_commitment!(), Readable::read(reader)?, Readable::read(reader)?));
1702 tx, revocation_key, a_htlc_key, b_htlc_key, delayed_payment_key, feerate_per_kw, htlc_outputs
1708 let prev_local_signed_commitment_tx = match <u8 as Readable<R>>::read(reader)? {
1711 Some(read_local_tx!())
1713 _ => return Err(DecodeError::InvalidValue),
1716 let current_local_signed_commitment_tx = match <u8 as Readable<R>>::read(reader)? {
1719 Some(read_local_tx!())
1721 _ => return Err(DecodeError::InvalidValue),
1724 let current_remote_commitment_number = <U48 as Readable<R>>::read(reader)?.0;
1726 let payment_preimages_len: u64 = Readable::read(reader)?;
1727 let mut payment_preimages = HashMap::with_capacity(cmp::min(payment_preimages_len as usize, MAX_ALLOC_SIZE / 32));
1728 let mut sha = Sha256::new();
1729 for _ in 0..payment_preimages_len {
1730 let preimage: [u8; 32] = Readable::read(reader)?;
1732 sha.input(&preimage);
1733 let mut hash = [0; 32];
1734 sha.result(&mut hash);
1735 if let Some(_) = payment_preimages.insert(hash, preimage) {
1736 return Err(DecodeError::InvalidValue);
1740 let last_block_hash: Sha256dHash = Readable::read(reader)?;
1741 let destination_script = Readable::read(reader)?;
1743 Ok((last_block_hash.clone(), ChannelMonitor {
1745 commitment_transaction_number_obscure_factor,
1748 their_htlc_base_key,
1749 their_delayed_payment_base_key,
1750 their_cur_revocation_points,
1753 their_to_self_delay,
1756 remote_claimable_outpoints,
1757 remote_commitment_txn_on_chain,
1758 remote_hash_commitment_number,
1760 prev_local_signed_commitment_tx,
1761 current_local_signed_commitment_tx,
1762 current_remote_commitment_number,
1777 use bitcoin::blockdata::script::Script;
1778 use bitcoin::blockdata::transaction::Transaction;
1779 use crypto::digest::Digest;
1781 use ln::channelmonitor::ChannelMonitor;
1782 use ln::chan_utils::{HTLCOutputInCommitment, TxCreationKeys};
1783 use util::sha2::Sha256;
1784 use util::test_utils::TestLogger;
1785 use secp256k1::key::{SecretKey,PublicKey};
1786 use secp256k1::{Secp256k1, Signature};
1787 use rand::{thread_rng,Rng};
1791 fn test_per_commitment_storage() {
1792 // Test vectors from BOLT 3:
1793 let mut secrets: Vec<[u8; 32]> = Vec::new();
1794 let mut monitor: ChannelMonitor;
1795 let secp_ctx = Secp256k1::new();
1796 let logger = Arc::new(TestLogger::new());
1798 macro_rules! test_secrets {
1800 let mut idx = 281474976710655;
1801 for secret in secrets.iter() {
1802 assert_eq!(monitor.get_secret(idx).unwrap(), *secret);
1805 assert_eq!(monitor.get_min_seen_secret(), idx + 1);
1806 assert!(monitor.get_secret(idx).is_none());
1811 // insert_secret correct sequence
1812 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
1815 secrets.push([0; 32]);
1816 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1817 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1820 secrets.push([0; 32]);
1821 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1822 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1825 secrets.push([0; 32]);
1826 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1827 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1830 secrets.push([0; 32]);
1831 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1832 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
1835 secrets.push([0; 32]);
1836 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1837 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
1840 secrets.push([0; 32]);
1841 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1842 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
1845 secrets.push([0; 32]);
1846 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1847 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
1850 secrets.push([0; 32]);
1851 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1852 monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap();
1857 // insert_secret #1 incorrect
1858 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
1861 secrets.push([0; 32]);
1862 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1863 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1866 secrets.push([0; 32]);
1867 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1868 assert_eq!(monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap_err().0,
1869 "Previous secret did not match new one");
1873 // insert_secret #2 incorrect (#1 derived from incorrect)
1874 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
1877 secrets.push([0; 32]);
1878 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1879 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1882 secrets.push([0; 32]);
1883 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
1884 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1887 secrets.push([0; 32]);
1888 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1889 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1892 secrets.push([0; 32]);
1893 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1894 assert_eq!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap_err().0,
1895 "Previous secret did not match new one");
1899 // insert_secret #3 incorrect
1900 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
1903 secrets.push([0; 32]);
1904 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1905 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1908 secrets.push([0; 32]);
1909 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1910 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1913 secrets.push([0; 32]);
1914 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
1915 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1918 secrets.push([0; 32]);
1919 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1920 assert_eq!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap_err().0,
1921 "Previous secret did not match new one");
1925 // insert_secret #4 incorrect (1,2,3 derived from incorrect)
1926 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
1929 secrets.push([0; 32]);
1930 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1931 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1934 secrets.push([0; 32]);
1935 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
1936 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1939 secrets.push([0; 32]);
1940 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
1941 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1944 secrets.push([0; 32]);
1945 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("ba65d7b0ef55a3ba300d4e87af29868f394f8f138d78a7011669c79b37b936f4").unwrap());
1946 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
1949 secrets.push([0; 32]);
1950 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1951 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
1954 secrets.push([0; 32]);
1955 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1956 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
1959 secrets.push([0; 32]);
1960 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1961 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
1964 secrets.push([0; 32]);
1965 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1966 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
1967 "Previous secret did not match new one");
1971 // insert_secret #5 incorrect
1972 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
1975 secrets.push([0; 32]);
1976 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1977 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1980 secrets.push([0; 32]);
1981 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1982 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1985 secrets.push([0; 32]);
1986 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1987 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1990 secrets.push([0; 32]);
1991 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1992 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
1995 secrets.push([0; 32]);
1996 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
1997 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2000 secrets.push([0; 32]);
2001 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
2002 assert_eq!(monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap_err().0,
2003 "Previous secret did not match new one");
2007 // insert_secret #6 incorrect (5 derived from incorrect)
2008 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
2011 secrets.push([0; 32]);
2012 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2013 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2016 secrets.push([0; 32]);
2017 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2018 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2021 secrets.push([0; 32]);
2022 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2023 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2026 secrets.push([0; 32]);
2027 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2028 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2031 secrets.push([0; 32]);
2032 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
2033 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2036 secrets.push([0; 32]);
2037 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("b7e76a83668bde38b373970155c868a653304308f9896692f904a23731224bb1").unwrap());
2038 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
2041 secrets.push([0; 32]);
2042 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
2043 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2046 secrets.push([0; 32]);
2047 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
2048 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2049 "Previous secret did not match new one");
2053 // insert_secret #7 incorrect
2054 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
2057 secrets.push([0; 32]);
2058 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2059 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2062 secrets.push([0; 32]);
2063 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2064 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2067 secrets.push([0; 32]);
2068 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2069 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2072 secrets.push([0; 32]);
2073 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2074 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2077 secrets.push([0; 32]);
2078 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
2079 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2082 secrets.push([0; 32]);
2083 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
2084 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
2087 secrets.push([0; 32]);
2088 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("e7971de736e01da8ed58b94c2fc216cb1dca9e326f3a96e7194fe8ea8af6c0a3").unwrap());
2089 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2092 secrets.push([0; 32]);
2093 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
2094 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2095 "Previous secret did not match new one");
2099 // insert_secret #8 incorrect
2100 monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
2103 secrets.push([0; 32]);
2104 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2105 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2108 secrets.push([0; 32]);
2109 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2110 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2113 secrets.push([0; 32]);
2114 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2115 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2118 secrets.push([0; 32]);
2119 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2120 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2123 secrets.push([0; 32]);
2124 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
2125 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2128 secrets.push([0; 32]);
2129 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
2130 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
2133 secrets.push([0; 32]);
2134 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
2135 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2138 secrets.push([0; 32]);
2139 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a7efbc61aac46d34f77778bac22c8a20c6a46ca460addc49009bda875ec88fa4").unwrap());
2140 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2141 "Previous secret did not match new one");
2146 fn test_prune_preimages() {
2147 let secp_ctx = Secp256k1::new();
2148 let logger = Arc::new(TestLogger::new());
2149 let dummy_sig = Signature::from_der(&secp_ctx, &hex::decode("3045022100fa86fa9a36a8cd6a7bb8f06a541787d51371d067951a9461d5404de6b928782e02201c8b7c334c10aed8976a3a465be9a28abff4cb23acbf00022295b378ce1fa3cd").unwrap()[..]).unwrap();
2151 let dummy_key = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap());
2152 macro_rules! dummy_keys {
2156 per_commitment_point: dummy_key.clone(),
2157 revocation_key: dummy_key.clone(),
2158 a_htlc_key: dummy_key.clone(),
2159 b_htlc_key: dummy_key.clone(),
2160 a_delayed_payment_key: dummy_key.clone(),
2161 b_payment_key: dummy_key.clone(),
2166 let dummy_tx = Transaction { version: 0, lock_time: 0, input: Vec::new(), output: Vec::new() };
2168 let mut preimages = Vec::new();
2170 let mut rng = thread_rng();
2172 let mut preimage = [0; 32];
2173 rng.fill_bytes(&mut preimage);
2174 let mut sha = Sha256::new();
2175 sha.input(&preimage);
2176 let mut hash = [0; 32];
2177 sha.result(&mut hash);
2178 preimages.push((preimage, hash));
2182 macro_rules! preimages_slice_to_htlc_outputs {
2183 ($preimages_slice: expr) => {
2185 let mut res = Vec::new();
2186 for (idx, preimage) in $preimages_slice.iter().enumerate() {
2187 res.push(HTLCOutputInCommitment {
2191 payment_hash: preimage.1.clone(),
2192 transaction_output_index: idx as u32,
2199 macro_rules! preimages_to_local_htlcs {
2200 ($preimages_slice: expr) => {
2202 let mut inp = preimages_slice_to_htlc_outputs!($preimages_slice);
2203 let res: Vec<_> = inp.drain(..).map(|e| { (e, dummy_sig.clone(), dummy_sig.clone()) }).collect();
2209 macro_rules! test_preimages_exist {
2210 ($preimages_slice: expr, $monitor: expr) => {
2211 for preimage in $preimages_slice {
2212 assert!($monitor.payment_preimages.contains_key(&preimage.1));
2217 // Prune with one old state and a local commitment tx holding a few overlaps with the
2219 let mut monitor = ChannelMonitor::new(&SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[43; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &SecretKey::from_slice(&secp_ctx, &[44; 32]).unwrap(), &PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[45; 32]).unwrap()), 0, Script::new(), logger.clone());
2220 monitor.set_their_to_self_delay(10);
2222 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..10]));
2223 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[5..15]), 281474976710655, dummy_key);
2224 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[15..20]), 281474976710654, dummy_key);
2225 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[17..20]), 281474976710653, dummy_key);
2226 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[18..20]), 281474976710652, dummy_key);
2227 for &(ref preimage, ref hash) in preimages.iter() {
2228 monitor.provide_payment_preimage(hash, preimage);
2231 // Now provide a secret, pruning preimages 10-15
2232 let mut secret = [0; 32];
2233 secret[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2234 monitor.provide_secret(281474976710655, secret.clone()).unwrap();
2235 assert_eq!(monitor.payment_preimages.len(), 15);
2236 test_preimages_exist!(&preimages[0..10], monitor);
2237 test_preimages_exist!(&preimages[15..20], monitor);
2239 // Now provide a further secret, pruning preimages 15-17
2240 secret[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2241 monitor.provide_secret(281474976710654, secret.clone()).unwrap();
2242 assert_eq!(monitor.payment_preimages.len(), 13);
2243 test_preimages_exist!(&preimages[0..10], monitor);
2244 test_preimages_exist!(&preimages[17..20], monitor);
2246 // Now update local commitment tx info, pruning only element 18 as we still care about the
2247 // previous commitment tx's preimages too
2248 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..5]));
2249 secret[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2250 monitor.provide_secret(281474976710653, secret.clone()).unwrap();
2251 assert_eq!(monitor.payment_preimages.len(), 12);
2252 test_preimages_exist!(&preimages[0..10], monitor);
2253 test_preimages_exist!(&preimages[18..20], monitor);
2255 // But if we do it again, we'll prune 5-10
2256 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..3]));
2257 secret[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2258 monitor.provide_secret(281474976710652, secret.clone()).unwrap();
2259 assert_eq!(monitor.payment_preimages.len(), 5);
2260 test_preimages_exist!(&preimages[0..5], monitor);
2263 // Further testing is done in the ChannelManager integration tests.