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 latest ChannelMonitor must always be actively monitoring for chain updates (and no out-of-date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_info!(monitor.key_storage));
174 return orig_monitor.insert_combine(monitor);
178 match monitor.key_storage {
179 Storage::Local { ref funding_info, .. } => {
182 return Err(MonitorUpdateError("Try to update a useless monitor without funding_txo !"));
184 &Some((ref outpoint, ref script)) => {
185 log_trace!(self, "Got new Channel Monitor for channel {}", log_bytes!(outpoint.to_channel_id()[..]));
186 self.chain_monitor.install_watch_tx(&outpoint.txid, script);
187 self.chain_monitor.install_watch_outpoint((outpoint.txid, outpoint.index as u32), script);
191 Storage::Watchtower { .. } => {
192 self.chain_monitor.watch_all_txn();
195 monitors.insert(key, monitor);
200 impl ManyChannelMonitor for SimpleManyChannelMonitor<OutPoint> {
201 fn add_update_monitor(&self, funding_txo: OutPoint, monitor: ChannelMonitor) -> Result<(), ChannelMonitorUpdateErr> {
202 match self.add_update_monitor_by_key(funding_txo, monitor) {
204 Err(_) => Err(ChannelMonitorUpdateErr::PermanentFailure),
209 impl<Key : Send + cmp::Eq + hash::Hash> events::EventsProvider for SimpleManyChannelMonitor<Key> {
210 fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
211 let mut pending_events = self.pending_events.lock().unwrap();
212 let mut ret = Vec::new();
213 mem::swap(&mut ret, &mut *pending_events);
218 /// If an HTLC expires within this many blocks, don't try to claim it in a shared transaction,
219 /// instead claiming it in its own individual transaction.
220 const CLTV_SHARED_CLAIM_BUFFER: u32 = 12;
221 /// If an HTLC expires within this many blocks, force-close the channel to broadcast the
222 /// HTLC-Success transaction.
223 /// In other words, this is an upper bound on how many blocks we think it can take us to get a
224 /// transaction confirmed (and we use it in a few more, equivalent, places).
225 pub(crate) const CLTV_CLAIM_BUFFER: u32 = 6;
226 /// Number of blocks by which point we expect our counterparty to have seen new blocks on the
227 /// network and done a full update_fail_htlc/commitment_signed dance (+ we've updated all our
228 /// copies of ChannelMonitors, including watchtowers).
229 pub(crate) const HTLC_FAIL_TIMEOUT_BLOCKS: u32 = 3;
231 #[derive(Clone, PartialEq)]
234 revocation_base_key: SecretKey,
235 htlc_base_key: SecretKey,
236 delayed_payment_base_key: SecretKey,
237 payment_base_key: SecretKey,
238 shutdown_pubkey: PublicKey,
239 prev_latest_per_commitment_point: Option<PublicKey>,
240 latest_per_commitment_point: Option<PublicKey>,
241 funding_info: Option<(OutPoint, Script)>,
244 revocation_base_key: PublicKey,
245 htlc_base_key: PublicKey,
249 #[derive(Clone, PartialEq)]
250 struct LocalSignedTx {
251 /// txid of the transaction in tx, just used to make comparison faster
254 revocation_key: PublicKey,
255 a_htlc_key: PublicKey,
256 b_htlc_key: PublicKey,
257 delayed_payment_key: PublicKey,
259 htlc_outputs: Vec<(HTLCOutputInCommitment, Signature, Signature)>,
262 const SERIALIZATION_VERSION: u8 = 1;
263 const MIN_SERIALIZATION_VERSION: u8 = 1;
265 /// A ChannelMonitor handles chain events (blocks connected and disconnected) and generates
266 /// on-chain transactions to ensure no loss of funds occurs.
268 /// You MUST ensure that no ChannelMonitors for a given channel anywhere contain out-of-date
269 /// information and are actively monitoring the chain.
271 pub struct ChannelMonitor {
272 commitment_transaction_number_obscure_factor: u64,
274 key_storage: Storage,
275 their_htlc_base_key: Option<PublicKey>,
276 their_delayed_payment_base_key: Option<PublicKey>,
277 // first is the idx of the first of the two revocation points
278 their_cur_revocation_points: Option<(u64, PublicKey, Option<PublicKey>)>,
280 our_to_self_delay: u16,
281 their_to_self_delay: Option<u16>,
283 old_secrets: [([u8; 32], u64); 49],
284 remote_claimable_outpoints: HashMap<Sha256dHash, Vec<HTLCOutputInCommitment>>,
285 /// We cannot identify HTLC-Success or HTLC-Timeout transactions by themselves on the chain.
286 /// Nor can we figure out their commitment numbers without the commitment transaction they are
287 /// spending. Thus, in order to claim them via revocation key, we track all the remote
288 /// commitment transactions which we find on-chain, mapping them to the commitment number which
289 /// can be used to derive the revocation key and claim the transactions.
290 remote_commitment_txn_on_chain: HashMap<Sha256dHash, (u64, Vec<Script>)>,
291 /// Cache used to make pruning of payment_preimages faster.
292 /// Maps payment_hash values to commitment numbers for remote transactions for non-revoked
293 /// remote transactions (ie should remain pretty small).
294 /// Serialized to disk but should generally not be sent to Watchtowers.
295 remote_hash_commitment_number: HashMap<[u8; 32], u64>,
297 // We store two local commitment transactions to avoid any race conditions where we may update
298 // some monitors (potentially on watchtowers) but then fail to update others, resulting in the
299 // various monitors for one channel being out of sync, and us broadcasting a local
300 // transaction for which we have deleted claim information on some watchtowers.
301 prev_local_signed_commitment_tx: Option<LocalSignedTx>,
302 current_local_signed_commitment_tx: Option<LocalSignedTx>,
304 // Used just for ChannelManager to make sure it has the latest channel data during
306 current_remote_commitment_number: u64,
308 payment_preimages: HashMap<[u8; 32], [u8; 32]>,
310 destination_script: Script,
312 // We simply modify last_block_hash in Channel's block_connected so that serialization is
313 // consistent but hopefully the users' copy handles block_connected in a consistent way.
314 // (we do *not*, however, update them in insert_combine to ensure any local user copies keep
315 // their last_block_hash from its state and not based on updated copies that didn't run through
316 // the full block_connected).
317 pub(crate) last_block_hash: Sha256dHash,
318 secp_ctx: Secp256k1<secp256k1::All>, //TODO: dedup this a bit...
322 #[cfg(any(test, feature = "fuzztarget"))]
323 /// Used only in testing and fuzztarget to check serialization roundtrips don't change the
324 /// underlying object
325 impl PartialEq for ChannelMonitor {
326 fn eq(&self, other: &Self) -> bool {
327 if self.commitment_transaction_number_obscure_factor != other.commitment_transaction_number_obscure_factor ||
328 self.key_storage != other.key_storage ||
329 self.their_htlc_base_key != other.their_htlc_base_key ||
330 self.their_delayed_payment_base_key != other.their_delayed_payment_base_key ||
331 self.their_cur_revocation_points != other.their_cur_revocation_points ||
332 self.our_to_self_delay != other.our_to_self_delay ||
333 self.their_to_self_delay != other.their_to_self_delay ||
334 self.remote_claimable_outpoints != other.remote_claimable_outpoints ||
335 self.remote_commitment_txn_on_chain != other.remote_commitment_txn_on_chain ||
336 self.remote_hash_commitment_number != other.remote_hash_commitment_number ||
337 self.prev_local_signed_commitment_tx != other.prev_local_signed_commitment_tx ||
338 self.current_remote_commitment_number != other.current_remote_commitment_number ||
339 self.current_local_signed_commitment_tx != other.current_local_signed_commitment_tx ||
340 self.payment_preimages != other.payment_preimages ||
341 self.destination_script != other.destination_script
345 for (&(ref secret, ref idx), &(ref o_secret, ref o_idx)) in self.old_secrets.iter().zip(other.old_secrets.iter()) {
346 if secret != o_secret || idx != o_idx {
355 impl ChannelMonitor {
356 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 {
358 commitment_transaction_number_obscure_factor: 0,
360 key_storage: Storage::Local {
361 revocation_base_key: revocation_base_key.clone(),
362 htlc_base_key: htlc_base_key.clone(),
363 delayed_payment_base_key: delayed_payment_base_key.clone(),
364 payment_base_key: payment_base_key.clone(),
365 shutdown_pubkey: shutdown_pubkey.clone(),
366 prev_latest_per_commitment_point: None,
367 latest_per_commitment_point: None,
370 their_htlc_base_key: None,
371 their_delayed_payment_base_key: None,
372 their_cur_revocation_points: None,
374 our_to_self_delay: our_to_self_delay,
375 their_to_self_delay: None,
377 old_secrets: [([0; 32], 1 << 48); 49],
378 remote_claimable_outpoints: HashMap::new(),
379 remote_commitment_txn_on_chain: HashMap::new(),
380 remote_hash_commitment_number: HashMap::new(),
382 prev_local_signed_commitment_tx: None,
383 current_local_signed_commitment_tx: None,
384 current_remote_commitment_number: 1 << 48,
386 payment_preimages: HashMap::new(),
387 destination_script: destination_script,
389 last_block_hash: Default::default(),
390 secp_ctx: Secp256k1::new(),
396 fn place_secret(idx: u64) -> u8 {
398 if idx & (1 << i) == (1 << i) {
406 fn derive_secret(secret: [u8; 32], bits: u8, idx: u64) -> [u8; 32] {
407 let mut res: [u8; 32] = secret;
409 let bitpos = bits - 1 - i;
410 if idx & (1 << bitpos) == (1 << bitpos) {
411 res[(bitpos / 8) as usize] ^= 1 << (bitpos & 7);
412 let mut sha = Sha256::new();
414 sha.result(&mut res);
420 /// Inserts a revocation secret into this channel monitor. Prunes old preimages if neither
421 /// needed by local commitment transactions HTCLs nor by remote ones. Unless we haven't already seen remote
422 /// commitment transaction's secret, they are de facto pruned (we can use revocation key).
423 pub(super) fn provide_secret(&mut self, idx: u64, secret: [u8; 32]) -> Result<(), MonitorUpdateError> {
424 let pos = ChannelMonitor::place_secret(idx);
426 let (old_secret, old_idx) = self.old_secrets[i as usize];
427 if ChannelMonitor::derive_secret(secret, pos, old_idx) != old_secret {
428 return Err(MonitorUpdateError("Previous secret did not match new one"));
431 self.old_secrets[pos as usize] = (secret, idx);
433 if !self.payment_preimages.is_empty() {
434 let local_signed_commitment_tx = self.current_local_signed_commitment_tx.as_ref().expect("Channel needs at least an initial commitment tx !");
435 let prev_local_signed_commitment_tx = self.prev_local_signed_commitment_tx.as_ref();
436 let min_idx = self.get_min_seen_secret();
437 let remote_hash_commitment_number = &mut self.remote_hash_commitment_number;
439 self.payment_preimages.retain(|&k, _| {
440 for &(ref htlc, _, _) in &local_signed_commitment_tx.htlc_outputs {
441 if k == htlc.payment_hash {
445 if let Some(prev_local_commitment_tx) = prev_local_signed_commitment_tx {
446 for &(ref htlc, _, _) in prev_local_commitment_tx.htlc_outputs.iter() {
447 if k == htlc.payment_hash {
452 let contains = if let Some(cn) = remote_hash_commitment_number.get(&k) {
459 remote_hash_commitment_number.remove(&k);
468 /// Informs this monitor of the latest remote (ie non-broadcastable) commitment transaction.
469 /// The monitor watches for it to be broadcasted and then uses the HTLC information (and
470 /// possibly future revocation/preimage information) to claim outputs where possible.
471 /// We cache also the mapping hash:commitment number to lighten pruning of old preimages by watchtowers.
472 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) {
473 // TODO: Encrypt the htlc_outputs data with the single-hash of the commitment transaction
474 // so that a remote monitor doesn't learn anything unless there is a malicious close.
475 // (only maybe, sadly we cant do the same for local info, as we need to be aware of
477 for htlc in &htlc_outputs {
478 self.remote_hash_commitment_number.insert(htlc.payment_hash, commitment_number);
480 self.remote_claimable_outpoints.insert(unsigned_commitment_tx.txid(), htlc_outputs);
481 self.current_remote_commitment_number = commitment_number;
482 //TODO: Merge this into the other per-remote-transaction output storage stuff
483 match self.their_cur_revocation_points {
484 Some(old_points) => {
485 if old_points.0 == commitment_number + 1 {
486 self.their_cur_revocation_points = Some((old_points.0, old_points.1, Some(their_revocation_point)));
487 } else if old_points.0 == commitment_number + 2 {
488 if let Some(old_second_point) = old_points.2 {
489 self.their_cur_revocation_points = Some((old_points.0 - 1, old_second_point, Some(their_revocation_point)));
491 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));
498 self.their_cur_revocation_points = Some((commitment_number, their_revocation_point, None));
503 /// Informs this monitor of the latest local (ie broadcastable) commitment transaction. The
504 /// monitor watches for timeouts and may broadcast it if we approach such a timeout. Thus, it
505 /// is important that any clones of this channel monitor (including remote clones) by kept
506 /// up-to-date as our local commitment transaction is updated.
507 /// Panics if set_their_to_self_delay has never been called.
508 /// Also update Storage with latest local per_commitment_point to derive local_delayedkey in
509 /// case of onchain HTLC tx
510 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)>) {
511 assert!(self.their_to_self_delay.is_some());
512 self.prev_local_signed_commitment_tx = self.current_local_signed_commitment_tx.take();
513 self.current_local_signed_commitment_tx = Some(LocalSignedTx {
514 txid: signed_commitment_tx.txid(),
515 tx: signed_commitment_tx,
516 revocation_key: local_keys.revocation_key,
517 a_htlc_key: local_keys.a_htlc_key,
518 b_htlc_key: local_keys.b_htlc_key,
519 delayed_payment_key: local_keys.a_delayed_payment_key,
524 if let Storage::Local { ref mut latest_per_commitment_point, .. } = self.key_storage {
525 *latest_per_commitment_point = Some(local_keys.per_commitment_point);
527 panic!("Channel somehow ended up with its internal ChannelMonitor being in Watchtower mode?");
531 /// Provides a payment_hash->payment_preimage mapping. Will be automatically pruned when all
532 /// commitment_tx_infos which contain the payment hash have been revoked.
533 pub(super) fn provide_payment_preimage(&mut self, payment_hash: &[u8; 32], payment_preimage: &[u8; 32]) {
534 self.payment_preimages.insert(payment_hash.clone(), payment_preimage.clone());
537 /// Combines this ChannelMonitor with the information contained in the other ChannelMonitor.
538 /// After a successful call this ChannelMonitor is up-to-date and is safe to use to monitor the
539 /// chain for new blocks/transactions.
540 pub fn insert_combine(&mut self, mut other: ChannelMonitor) -> Result<(), MonitorUpdateError> {
541 match self.key_storage {
542 Storage::Local { ref funding_info, .. } => {
543 if funding_info.is_none() { return Err(MonitorUpdateError("Try to combine a Local monitor without funding_info")); }
544 let our_funding_info = funding_info;
545 if let Storage::Local { ref funding_info, .. } = other.key_storage {
546 if funding_info.is_none() { return Err(MonitorUpdateError("Try to combine a Local monitor without funding_info")); }
547 // We should be able to compare the entire funding_txo, but in fuzztarget its trivially
548 // easy to collide the funding_txo hash and have a different scriptPubKey.
549 if funding_info.as_ref().unwrap().0 != our_funding_info.as_ref().unwrap().0 {
550 return Err(MonitorUpdateError("Funding transaction outputs are not identical!"));
553 return Err(MonitorUpdateError("Try to combine a Local monitor with a Watchtower one !"));
556 Storage::Watchtower { .. } => {
557 if let Storage::Watchtower { .. } = other.key_storage {
560 return Err(MonitorUpdateError("Try to combine a Watchtower monitor with a Local one !"));
564 let other_min_secret = other.get_min_seen_secret();
565 let our_min_secret = self.get_min_seen_secret();
566 if our_min_secret > other_min_secret {
567 self.provide_secret(other_min_secret, other.get_secret(other_min_secret).unwrap())?;
569 if let Some(ref local_tx) = self.current_local_signed_commitment_tx {
570 if let Some(ref other_local_tx) = other.current_local_signed_commitment_tx {
571 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);
572 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);
573 if our_commitment_number >= other_commitment_number {
574 self.key_storage = other.key_storage;
578 // TODO: We should use current_remote_commitment_number and the commitment number out of
579 // local transactions to decide how to merge
580 if our_min_secret >= other_min_secret {
581 self.their_cur_revocation_points = other.their_cur_revocation_points;
582 for (txid, htlcs) in other.remote_claimable_outpoints.drain() {
583 self.remote_claimable_outpoints.insert(txid, htlcs);
585 if let Some(local_tx) = other.prev_local_signed_commitment_tx {
586 self.prev_local_signed_commitment_tx = Some(local_tx);
588 if let Some(local_tx) = other.current_local_signed_commitment_tx {
589 self.current_local_signed_commitment_tx = Some(local_tx);
591 self.payment_preimages = other.payment_preimages;
594 self.current_remote_commitment_number = cmp::min(self.current_remote_commitment_number, other.current_remote_commitment_number);
598 /// Panics if commitment_transaction_number_obscure_factor doesn't fit in 48 bits
599 pub(super) fn set_commitment_obscure_factor(&mut self, commitment_transaction_number_obscure_factor: u64) {
600 assert!(commitment_transaction_number_obscure_factor < (1 << 48));
601 self.commitment_transaction_number_obscure_factor = commitment_transaction_number_obscure_factor;
604 /// Allows this monitor to scan only for transactions which are applicable. Note that this is
605 /// optional, without it this monitor cannot be used in an SPV client, but you may wish to
606 /// avoid this (or call unset_funding_info) on a monitor you wish to send to a watchtower as it
607 /// provides slightly better privacy.
608 /// It's the responsibility of the caller to register outpoint and script with passing the former
609 /// value as key to add_update_monitor.
610 pub(super) fn set_funding_info(&mut self, new_funding_info: (OutPoint, Script)) {
611 match self.key_storage {
612 Storage::Local { ref mut funding_info, .. } => {
613 *funding_info = Some(new_funding_info);
615 Storage::Watchtower { .. } => {
616 panic!("Channel somehow ended up with its internal ChannelMonitor being in Watchtower mode?");
621 /// We log these base keys at channel opening to being able to rebuild redeemscript in case of leaked revoked commit tx
622 pub(super) fn set_their_base_keys(&mut self, their_htlc_base_key: &PublicKey, their_delayed_payment_base_key: &PublicKey) {
623 self.their_htlc_base_key = Some(their_htlc_base_key.clone());
624 self.their_delayed_payment_base_key = Some(their_delayed_payment_base_key.clone());
627 pub(super) fn set_their_to_self_delay(&mut self, their_to_self_delay: u16) {
628 self.their_to_self_delay = Some(their_to_self_delay);
631 pub(super) fn unset_funding_info(&mut self) {
632 match self.key_storage {
633 Storage::Local { ref mut funding_info, .. } => {
634 *funding_info = None;
636 Storage::Watchtower { .. } => {
637 panic!("Channel somehow ended up with its internal ChannelMonitor being in Watchtower mode?");
642 /// Gets the funding transaction outpoint of the channel this ChannelMonitor is monitoring for.
643 pub fn get_funding_txo(&self) -> Option<OutPoint> {
644 match self.key_storage {
645 Storage::Local { ref funding_info, .. } => {
647 &Some((outpoint, _)) => Some(outpoint),
651 Storage::Watchtower { .. } => {
657 /// Gets the sets of all outpoints which this ChannelMonitor expects to hear about spends of.
658 /// Generally useful when deserializing as during normal operation the return values of
659 /// block_connected are sufficient to ensure all relevant outpoints are being monitored (note
660 /// that the get_funding_txo outpoint and transaction must also be monitored for!).
661 pub fn get_monitored_outpoints(&self) -> Vec<(Sha256dHash, u32, &Script)> {
662 let mut res = Vec::with_capacity(self.remote_commitment_txn_on_chain.len() * 2);
663 for (ref txid, &(_, ref outputs)) in self.remote_commitment_txn_on_chain.iter() {
664 for (idx, output) in outputs.iter().enumerate() {
665 res.push(((*txid).clone(), idx as u32, output));
671 /// Serializes into a vec, with various modes for the exposed pub fns
672 fn write<W: Writer>(&self, writer: &mut W, for_local_storage: bool) -> Result<(), ::std::io::Error> {
673 //TODO: We still write out all the serialization here manually instead of using the fancy
674 //serialization framework we have, we should migrate things over to it.
675 writer.write_all(&[SERIALIZATION_VERSION; 1])?;
676 writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
678 // Set in initial Channel-object creation, so should always be set by now:
679 U48(self.commitment_transaction_number_obscure_factor).write(writer)?;
681 match self.key_storage {
682 Storage::Local { 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, ref funding_info } => {
683 writer.write_all(&[0; 1])?;
684 writer.write_all(&revocation_base_key[..])?;
685 writer.write_all(&htlc_base_key[..])?;
686 writer.write_all(&delayed_payment_base_key[..])?;
687 writer.write_all(&payment_base_key[..])?;
688 writer.write_all(&shutdown_pubkey.serialize())?;
689 if let Some(ref prev_latest_per_commitment_point) = *prev_latest_per_commitment_point {
690 writer.write_all(&[1; 1])?;
691 writer.write_all(&prev_latest_per_commitment_point.serialize())?;
693 writer.write_all(&[0; 1])?;
695 if let Some(ref latest_per_commitment_point) = *latest_per_commitment_point {
696 writer.write_all(&[1; 1])?;
697 writer.write_all(&latest_per_commitment_point.serialize())?;
699 writer.write_all(&[0; 1])?;
702 &Some((ref outpoint, ref script)) => {
703 writer.write_all(&outpoint.txid[..])?;
704 writer.write_all(&byte_utils::be16_to_array(outpoint.index))?;
705 script.write(writer)?;
708 debug_assert!(false, "Try to serialize a useless Local monitor !");
712 Storage::Watchtower { .. } => unimplemented!(),
715 writer.write_all(&self.their_htlc_base_key.as_ref().unwrap().serialize())?;
716 writer.write_all(&self.their_delayed_payment_base_key.as_ref().unwrap().serialize())?;
718 match self.their_cur_revocation_points {
719 Some((idx, pubkey, second_option)) => {
720 writer.write_all(&byte_utils::be48_to_array(idx))?;
721 writer.write_all(&pubkey.serialize())?;
722 match second_option {
723 Some(second_pubkey) => {
724 writer.write_all(&second_pubkey.serialize())?;
727 writer.write_all(&[0; 33])?;
732 writer.write_all(&byte_utils::be48_to_array(0))?;
736 writer.write_all(&byte_utils::be16_to_array(self.our_to_self_delay))?;
737 writer.write_all(&byte_utils::be16_to_array(self.their_to_self_delay.unwrap()))?;
739 for &(ref secret, ref idx) in self.old_secrets.iter() {
740 writer.write_all(secret)?;
741 writer.write_all(&byte_utils::be64_to_array(*idx))?;
744 macro_rules! serialize_htlc_in_commitment {
745 ($htlc_output: expr) => {
746 writer.write_all(&[$htlc_output.offered as u8; 1])?;
747 writer.write_all(&byte_utils::be64_to_array($htlc_output.amount_msat))?;
748 writer.write_all(&byte_utils::be32_to_array($htlc_output.cltv_expiry))?;
749 writer.write_all(&$htlc_output.payment_hash)?;
750 writer.write_all(&byte_utils::be32_to_array($htlc_output.transaction_output_index))?;
754 writer.write_all(&byte_utils::be64_to_array(self.remote_claimable_outpoints.len() as u64))?;
755 for (ref txid, ref htlc_outputs) in self.remote_claimable_outpoints.iter() {
756 writer.write_all(&txid[..])?;
757 writer.write_all(&byte_utils::be64_to_array(htlc_outputs.len() as u64))?;
758 for htlc_output in htlc_outputs.iter() {
759 serialize_htlc_in_commitment!(htlc_output);
763 writer.write_all(&byte_utils::be64_to_array(self.remote_commitment_txn_on_chain.len() as u64))?;
764 for (ref txid, &(commitment_number, ref txouts)) in self.remote_commitment_txn_on_chain.iter() {
765 writer.write_all(&txid[..])?;
766 writer.write_all(&byte_utils::be48_to_array(commitment_number))?;
767 (txouts.len() as u64).write(writer)?;
768 for script in txouts.iter() {
769 script.write(writer)?;
773 if for_local_storage {
774 writer.write_all(&byte_utils::be64_to_array(self.remote_hash_commitment_number.len() as u64))?;
775 for (ref payment_hash, commitment_number) in self.remote_hash_commitment_number.iter() {
776 writer.write_all(*payment_hash)?;
777 writer.write_all(&byte_utils::be48_to_array(*commitment_number))?;
780 writer.write_all(&byte_utils::be64_to_array(0))?;
783 macro_rules! serialize_local_tx {
784 ($local_tx: expr) => {
785 if let Err(e) = $local_tx.tx.consensus_encode(&mut WriterWriteAdaptor(writer)) {
787 encode::Error::Io(e) => return Err(e),
788 _ => panic!("local tx must have been well-formed!"),
792 writer.write_all(&$local_tx.revocation_key.serialize())?;
793 writer.write_all(&$local_tx.a_htlc_key.serialize())?;
794 writer.write_all(&$local_tx.b_htlc_key.serialize())?;
795 writer.write_all(&$local_tx.delayed_payment_key.serialize())?;
797 writer.write_all(&byte_utils::be64_to_array($local_tx.feerate_per_kw))?;
798 writer.write_all(&byte_utils::be64_to_array($local_tx.htlc_outputs.len() as u64))?;
799 for &(ref htlc_output, ref their_sig, ref our_sig) in $local_tx.htlc_outputs.iter() {
800 serialize_htlc_in_commitment!(htlc_output);
801 writer.write_all(&their_sig.serialize_compact(&self.secp_ctx))?;
802 writer.write_all(&our_sig.serialize_compact(&self.secp_ctx))?;
807 if let Some(ref prev_local_tx) = self.prev_local_signed_commitment_tx {
808 writer.write_all(&[1; 1])?;
809 serialize_local_tx!(prev_local_tx);
811 writer.write_all(&[0; 1])?;
814 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
815 writer.write_all(&[1; 1])?;
816 serialize_local_tx!(cur_local_tx);
818 writer.write_all(&[0; 1])?;
821 if for_local_storage {
822 writer.write_all(&byte_utils::be48_to_array(self.current_remote_commitment_number))?;
824 writer.write_all(&byte_utils::be48_to_array(0))?;
827 writer.write_all(&byte_utils::be64_to_array(self.payment_preimages.len() as u64))?;
828 for payment_preimage in self.payment_preimages.values() {
829 writer.write_all(payment_preimage)?;
832 self.last_block_hash.write(writer)?;
833 self.destination_script.write(writer)?;
838 /// Writes this monitor into the given writer, suitable for writing to disk.
840 /// Note that the deserializer is only implemented for (Sha256dHash, ChannelMonitor), which
841 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
842 /// the "reorg path" (ie not just starting at the same height but starting at the highest
843 /// common block that appears on your best chain as well as on the chain which contains the
844 /// last block hash returned) upon deserializing the object!
845 pub fn write_for_disk<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
846 self.write(writer, true)
849 /// Encodes this monitor into the given writer, suitable for sending to a remote watchtower
851 /// Note that the deserializer is only implemented for (Sha256dHash, ChannelMonitor), which
852 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
853 /// the "reorg path" (ie not just starting at the same height but starting at the highest
854 /// common block that appears on your best chain as well as on the chain which contains the
855 /// last block hash returned) upon deserializing the object!
856 pub fn write_for_watchtower<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
857 self.write(writer, false)
860 //TODO: Functions to serialize/deserialize (with different forms depending on which information
861 //we want to leave out (eg funding_txo, etc).
863 /// Can only fail if idx is < get_min_seen_secret
864 pub(super) fn get_secret(&self, idx: u64) -> Option<[u8; 32]> {
865 for i in 0..self.old_secrets.len() {
866 if (idx & (!((1 << i) - 1))) == self.old_secrets[i].1 {
867 return Some(ChannelMonitor::derive_secret(self.old_secrets[i].0, i as u8, idx))
870 assert!(idx < self.get_min_seen_secret());
874 pub(super) fn get_min_seen_secret(&self) -> u64 {
875 //TODO This can be optimized?
876 let mut min = 1 << 48;
877 for &(_, idx) in self.old_secrets.iter() {
885 pub(super) fn get_cur_remote_commitment_number(&self) -> u64 {
886 self.current_remote_commitment_number
889 pub(super) fn get_cur_local_commitment_number(&self) -> u64 {
890 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
891 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)
892 } else { 0xffff_ffff_ffff }
895 /// Attempts to claim a remote commitment transaction's outputs using the revocation key and
896 /// data in remote_claimable_outpoints. Will directly claim any HTLC outputs which expire at a
897 /// height > height + CLTV_SHARED_CLAIM_BUFFER. In any case, will install monitoring for
898 /// HTLC-Success/HTLC-Timeout transactions.
899 fn check_spend_remote_transaction(&mut self, tx: &Transaction, height: u32) -> (Vec<Transaction>, (Sha256dHash, Vec<TxOut>), Vec<SpendableOutputDescriptor>) {
900 // Most secp and related errors trying to create keys means we have no hope of constructing
901 // a spend transaction...so we return no transactions to broadcast
902 let mut txn_to_broadcast = Vec::new();
903 let mut watch_outputs = Vec::new();
904 let mut spendable_outputs = Vec::new();
906 let commitment_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers!
907 let per_commitment_option = self.remote_claimable_outpoints.get(&commitment_txid);
909 macro_rules! ignore_error {
910 ( $thing : expr ) => {
913 Err(_) => return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs)
918 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);
919 if commitment_number >= self.get_min_seen_secret() {
920 let secret = self.get_secret(commitment_number).unwrap();
921 let per_commitment_key = ignore_error!(SecretKey::from_slice(&self.secp_ctx, &secret));
922 let (revocation_pubkey, b_htlc_key, local_payment_key) = match self.key_storage {
923 Storage::Local { ref revocation_base_key, ref htlc_base_key, ref payment_base_key, .. } => {
924 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key);
925 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key))),
926 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &PublicKey::from_secret_key(&self.secp_ctx, &htlc_base_key))),
927 Some(ignore_error!(chan_utils::derive_private_key(&self.secp_ctx, &per_commitment_point, &payment_base_key))))
929 Storage::Watchtower { ref revocation_base_key, ref htlc_base_key, .. } => {
930 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key);
931 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &revocation_base_key)),
932 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &htlc_base_key)),
936 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()));
937 let a_htlc_key = match self.their_htlc_base_key {
938 None => return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs),
939 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)),
942 let revokeable_redeemscript = chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.our_to_self_delay, &delayed_key);
943 let revokeable_p2wsh = revokeable_redeemscript.to_v0_p2wsh();
945 let local_payment_p2wpkh = if let Some(payment_key) = local_payment_key {
946 // Note that the Network here is ignored as we immediately drop the address for the
947 // script_pubkey version.
948 let payment_hash160 = Hash160::from_data(&PublicKey::from_secret_key(&self.secp_ctx, &payment_key).serialize());
949 Some(Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&payment_hash160[..]).into_script())
952 let mut total_value = 0;
953 let mut values = Vec::new();
954 let mut inputs = Vec::new();
955 let mut htlc_idxs = Vec::new();
957 for (idx, outp) in tx.output.iter().enumerate() {
958 if outp.script_pubkey == revokeable_p2wsh {
960 previous_output: BitcoinOutPoint {
961 txid: commitment_txid,
964 script_sig: Script::new(),
965 sequence: 0xfffffffd,
968 htlc_idxs.push(None);
969 values.push(outp.value);
970 total_value += outp.value;
971 } else if Some(&outp.script_pubkey) == local_payment_p2wpkh.as_ref() {
972 spendable_outputs.push(SpendableOutputDescriptor::DynamicOutputP2WPKH {
973 outpoint: BitcoinOutPoint { txid: commitment_txid, vout: idx as u32 },
974 key: local_payment_key.unwrap(),
975 output: outp.clone(),
980 macro_rules! sign_input {
981 ($sighash_parts: expr, $input: expr, $htlc_idx: expr, $amount: expr) => {
983 let (sig, redeemscript) = match self.key_storage {
984 Storage::Local { ref revocation_base_key, .. } => {
985 let redeemscript = if $htlc_idx.is_none() { revokeable_redeemscript.clone() } else {
986 let htlc = &per_commitment_option.unwrap()[$htlc_idx.unwrap()];
987 chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey)
989 let sighash = ignore_error!(Message::from_slice(&$sighash_parts.sighash_all(&$input, &redeemscript, $amount)[..]));
990 let revocation_key = ignore_error!(chan_utils::derive_private_revocation_key(&self.secp_ctx, &per_commitment_key, &revocation_base_key));
991 (self.secp_ctx.sign(&sighash, &revocation_key), redeemscript)
993 Storage::Watchtower { .. } => {
997 $input.witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
998 $input.witness[0].push(SigHashType::All as u8);
999 if $htlc_idx.is_none() {
1000 $input.witness.push(vec!(1));
1002 $input.witness.push(revocation_pubkey.serialize().to_vec());
1004 $input.witness.push(redeemscript.into_bytes());
1009 if let Some(per_commitment_data) = per_commitment_option {
1010 inputs.reserve_exact(per_commitment_data.len());
1012 for (idx, htlc) in per_commitment_data.iter().enumerate() {
1013 let expected_script = chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey);
1014 if htlc.transaction_output_index as usize >= tx.output.len() ||
1015 tx.output[htlc.transaction_output_index as usize].value != htlc.amount_msat / 1000 ||
1016 tx.output[htlc.transaction_output_index as usize].script_pubkey != expected_script.to_v0_p2wsh() {
1017 return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs); // Corrupted per_commitment_data, fuck this user
1020 previous_output: BitcoinOutPoint {
1021 txid: commitment_txid,
1022 vout: htlc.transaction_output_index,
1024 script_sig: Script::new(),
1025 sequence: 0xfffffffd,
1026 witness: Vec::new(),
1028 if htlc.cltv_expiry > height + CLTV_SHARED_CLAIM_BUFFER {
1030 htlc_idxs.push(Some(idx));
1031 values.push(tx.output[htlc.transaction_output_index as usize].value);
1032 total_value += htlc.amount_msat / 1000;
1034 let mut single_htlc_tx = Transaction {
1038 output: vec!(TxOut {
1039 script_pubkey: self.destination_script.clone(),
1040 value: htlc.amount_msat / 1000, //TODO: - fee
1043 let sighash_parts = bip143::SighashComponents::new(&single_htlc_tx);
1044 sign_input!(sighash_parts, single_htlc_tx.input[0], Some(idx), htlc.amount_msat / 1000);
1045 txn_to_broadcast.push(single_htlc_tx);
1050 if !inputs.is_empty() || !txn_to_broadcast.is_empty() { // ie we're confident this is actually ours
1051 // We're definitely a remote commitment transaction!
1052 watch_outputs.append(&mut tx.output.clone());
1053 self.remote_commitment_txn_on_chain.insert(commitment_txid, (commitment_number, tx.output.iter().map(|output| { output.script_pubkey.clone() }).collect()));
1055 if inputs.is_empty() { return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs); } // Nothing to be done...probably a false positive/local tx
1057 let outputs = vec!(TxOut {
1058 script_pubkey: self.destination_script.clone(),
1059 value: total_value, //TODO: - fee
1061 let mut spend_tx = Transaction {
1068 let mut values_drain = values.drain(..);
1069 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1071 for (input, htlc_idx) in spend_tx.input.iter_mut().zip(htlc_idxs.iter()) {
1072 let value = values_drain.next().unwrap();
1073 sign_input!(sighash_parts, input, htlc_idx, value);
1076 spendable_outputs.push(SpendableOutputDescriptor::StaticOutput {
1077 outpoint: BitcoinOutPoint { txid: spend_tx.txid(), vout: 0 },
1078 output: spend_tx.output[0].clone(),
1080 txn_to_broadcast.push(spend_tx);
1081 } else if let Some(per_commitment_data) = per_commitment_option {
1082 // While this isn't useful yet, there is a potential race where if a counterparty
1083 // revokes a state at the same time as the commitment transaction for that state is
1084 // confirmed, and the watchtower receives the block before the user, the user could
1085 // upload a new ChannelMonitor with the revocation secret but the watchtower has
1086 // already processed the block, resulting in the remote_commitment_txn_on_chain entry
1087 // not being generated by the above conditional. Thus, to be safe, we go ahead and
1089 watch_outputs.append(&mut tx.output.clone());
1090 self.remote_commitment_txn_on_chain.insert(commitment_txid, (commitment_number, tx.output.iter().map(|output| { output.script_pubkey.clone() }).collect()));
1092 if let Some(revocation_points) = self.their_cur_revocation_points {
1093 let revocation_point_option =
1094 if revocation_points.0 == commitment_number { Some(&revocation_points.1) }
1095 else if let Some(point) = revocation_points.2.as_ref() {
1096 if revocation_points.0 == commitment_number + 1 { Some(point) } else { None }
1098 if let Some(revocation_point) = revocation_point_option {
1099 let (revocation_pubkey, b_htlc_key) = match self.key_storage {
1100 Storage::Local { ref revocation_base_key, ref htlc_base_key, .. } => {
1101 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, revocation_point, &PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key))),
1102 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &PublicKey::from_secret_key(&self.secp_ctx, &htlc_base_key))))
1104 Storage::Watchtower { ref revocation_base_key, ref htlc_base_key, .. } => {
1105 (ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, revocation_point, &revocation_base_key)),
1106 ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &htlc_base_key)))
1109 let a_htlc_key = match self.their_htlc_base_key {
1110 None => return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs),
1111 Some(their_htlc_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, revocation_point, &their_htlc_base_key)),
1114 for (idx, outp) in tx.output.iter().enumerate() {
1115 if outp.script_pubkey.is_v0_p2wpkh() {
1116 match self.key_storage {
1117 Storage::Local { ref payment_base_key, .. } => {
1118 if let Ok(local_key) = chan_utils::derive_private_key(&self.secp_ctx, &revocation_point, &payment_base_key) {
1119 spendable_outputs.push(SpendableOutputDescriptor::DynamicOutputP2WPKH {
1120 outpoint: BitcoinOutPoint { txid: commitment_txid, vout: idx as u32 },
1122 output: outp.clone(),
1126 Storage::Watchtower { .. } => {}
1128 break; // Only to_remote ouput is claimable
1132 let mut total_value = 0;
1133 let mut values = Vec::new();
1134 let mut inputs = Vec::new();
1136 macro_rules! sign_input {
1137 ($sighash_parts: expr, $input: expr, $amount: expr, $preimage: expr) => {
1139 let (sig, redeemscript) = match self.key_storage {
1140 Storage::Local { ref htlc_base_key, .. } => {
1141 let htlc = &per_commitment_option.unwrap()[$input.sequence as usize];
1142 let redeemscript = chan_utils::get_htlc_redeemscript_with_explicit_keys(htlc, &a_htlc_key, &b_htlc_key, &revocation_pubkey);
1143 let sighash = ignore_error!(Message::from_slice(&$sighash_parts.sighash_all(&$input, &redeemscript, $amount)[..]));
1144 let htlc_key = ignore_error!(chan_utils::derive_private_key(&self.secp_ctx, revocation_point, &htlc_base_key));
1145 (self.secp_ctx.sign(&sighash, &htlc_key), redeemscript)
1147 Storage::Watchtower { .. } => {
1151 $input.witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
1152 $input.witness[0].push(SigHashType::All as u8);
1153 $input.witness.push($preimage);
1154 $input.witness.push(redeemscript.into_bytes());
1159 for (idx, htlc) in per_commitment_data.iter().enumerate() {
1160 if let Some(payment_preimage) = self.payment_preimages.get(&htlc.payment_hash) {
1162 previous_output: BitcoinOutPoint {
1163 txid: commitment_txid,
1164 vout: htlc.transaction_output_index,
1166 script_sig: Script::new(),
1167 sequence: idx as u32, // reset to 0xfffffffd in sign_input
1168 witness: Vec::new(),
1170 if htlc.cltv_expiry > height + CLTV_SHARED_CLAIM_BUFFER {
1172 values.push((tx.output[htlc.transaction_output_index as usize].value, payment_preimage));
1173 total_value += htlc.amount_msat / 1000;
1175 let mut single_htlc_tx = Transaction {
1179 output: vec!(TxOut {
1180 script_pubkey: self.destination_script.clone(),
1181 value: htlc.amount_msat / 1000, //TODO: - fee
1184 let sighash_parts = bip143::SighashComponents::new(&single_htlc_tx);
1185 sign_input!(sighash_parts, single_htlc_tx.input[0], htlc.amount_msat / 1000, payment_preimage.to_vec());
1186 spendable_outputs.push(SpendableOutputDescriptor::StaticOutput {
1187 outpoint: BitcoinOutPoint { txid: single_htlc_tx.txid(), vout: 0 },
1188 output: single_htlc_tx.output[0].clone(),
1190 txn_to_broadcast.push(single_htlc_tx);
1195 if inputs.is_empty() { return (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs); } // Nothing to be done...probably a false positive/local tx
1197 let outputs = vec!(TxOut {
1198 script_pubkey: self.destination_script.clone(),
1199 value: total_value, //TODO: - fee
1201 let mut spend_tx = Transaction {
1208 let mut values_drain = values.drain(..);
1209 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1211 for input in spend_tx.input.iter_mut() {
1212 let value = values_drain.next().unwrap();
1213 sign_input!(sighash_parts, input, value.0, value.1.to_vec());
1216 spendable_outputs.push(SpendableOutputDescriptor::StaticOutput {
1217 outpoint: BitcoinOutPoint { txid: spend_tx.txid(), vout: 0 },
1218 output: spend_tx.output[0].clone(),
1220 txn_to_broadcast.push(spend_tx);
1225 (txn_to_broadcast, (commitment_txid, watch_outputs), spendable_outputs)
1228 /// Attempst to claim a remote HTLC-Success/HTLC-Timeout s outputs using the revocation key
1229 fn check_spend_remote_htlc(&self, tx: &Transaction, commitment_number: u64) -> (Option<Transaction>, Option<SpendableOutputDescriptor>) {
1230 if tx.input.len() != 1 || tx.output.len() != 1 {
1234 macro_rules! ignore_error {
1235 ( $thing : expr ) => {
1238 Err(_) => return (None, None)
1243 let secret = if let Some(secret) = self.get_secret(commitment_number) { secret } else { return (None, None); };
1244 let per_commitment_key = ignore_error!(SecretKey::from_slice(&self.secp_ctx, &secret));
1245 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key);
1246 let revocation_pubkey = match self.key_storage {
1247 Storage::Local { ref revocation_base_key, .. } => {
1248 ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &PublicKey::from_secret_key(&self.secp_ctx, &revocation_base_key)))
1250 Storage::Watchtower { ref revocation_base_key, .. } => {
1251 ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &revocation_base_key))
1254 let delayed_key = match self.their_delayed_payment_base_key {
1255 None => return (None, None),
1256 Some(their_delayed_payment_base_key) => ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &per_commitment_point, &their_delayed_payment_base_key)),
1258 let redeemscript = chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.their_to_self_delay.unwrap(), &delayed_key);
1259 let revokeable_p2wsh = redeemscript.to_v0_p2wsh();
1260 let htlc_txid = tx.txid(); //TODO: This is gonna be a performance bottleneck for watchtowers!
1262 let mut inputs = Vec::new();
1265 if tx.output[0].script_pubkey == revokeable_p2wsh { //HTLC transactions have one txin, one txout
1267 previous_output: BitcoinOutPoint {
1271 script_sig: Script::new(),
1272 sequence: 0xfffffffd,
1273 witness: Vec::new(),
1275 amount = tx.output[0].value;
1278 if !inputs.is_empty() {
1279 let outputs = vec!(TxOut {
1280 script_pubkey: self.destination_script.clone(),
1281 value: amount, //TODO: - fee
1284 let mut spend_tx = Transaction {
1291 let sighash_parts = bip143::SighashComponents::new(&spend_tx);
1293 let sig = match self.key_storage {
1294 Storage::Local { ref revocation_base_key, .. } => {
1295 let sighash = ignore_error!(Message::from_slice(&sighash_parts.sighash_all(&spend_tx.input[0], &redeemscript, amount)[..]));
1296 let revocation_key = ignore_error!(chan_utils::derive_private_revocation_key(&self.secp_ctx, &per_commitment_key, &revocation_base_key));
1297 self.secp_ctx.sign(&sighash, &revocation_key)
1299 Storage::Watchtower { .. } => {
1303 spend_tx.input[0].witness.push(sig.serialize_der(&self.secp_ctx).to_vec());
1304 spend_tx.input[0].witness[0].push(SigHashType::All as u8);
1305 spend_tx.input[0].witness.push(vec!(1));
1306 spend_tx.input[0].witness.push(redeemscript.into_bytes());
1308 let outpoint = BitcoinOutPoint { txid: spend_tx.txid(), vout: 0 };
1309 let output = spend_tx.output[0].clone();
1310 (Some(spend_tx), Some(SpendableOutputDescriptor::StaticOutput { outpoint, output }))
1311 } else { (None, None) }
1314 fn broadcast_by_local_state(&self, local_tx: &LocalSignedTx, per_commitment_point: &Option<PublicKey>, delayed_payment_base_key: &Option<SecretKey>) -> (Vec<Transaction>, Vec<SpendableOutputDescriptor>) {
1315 let mut res = Vec::with_capacity(local_tx.htlc_outputs.len());
1316 let mut spendable_outputs = Vec::with_capacity(local_tx.htlc_outputs.len());
1318 macro_rules! add_dynamic_output {
1319 ($father_tx: expr, $vout: expr) => {
1320 if let Some(ref per_commitment_point) = *per_commitment_point {
1321 if let Some(ref delayed_payment_base_key) = *delayed_payment_base_key {
1322 if let Ok(local_delayedkey) = chan_utils::derive_private_key(&self.secp_ctx, per_commitment_point, delayed_payment_base_key) {
1323 spendable_outputs.push(SpendableOutputDescriptor::DynamicOutputP2WSH {
1324 outpoint: BitcoinOutPoint { txid: $father_tx.txid(), vout: $vout },
1325 key: local_delayedkey,
1326 witness_script: chan_utils::get_revokeable_redeemscript(&local_tx.revocation_key, self.our_to_self_delay, &local_tx.delayed_payment_key),
1327 to_self_delay: self.our_to_self_delay,
1328 output: $father_tx.output[$vout as usize].clone(),
1337 let redeemscript = chan_utils::get_revokeable_redeemscript(&local_tx.revocation_key, self.their_to_self_delay.unwrap(), &local_tx.delayed_payment_key);
1338 let revokeable_p2wsh = redeemscript.to_v0_p2wsh();
1339 for (idx, output) in local_tx.tx.output.iter().enumerate() {
1340 if output.script_pubkey == revokeable_p2wsh {
1341 add_dynamic_output!(local_tx.tx, idx as u32);
1346 for &(ref htlc, ref their_sig, ref our_sig) in local_tx.htlc_outputs.iter() {
1348 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);
1350 htlc_timeout_tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1352 htlc_timeout_tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1353 htlc_timeout_tx.input[0].witness[1].push(SigHashType::All as u8);
1354 htlc_timeout_tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1355 htlc_timeout_tx.input[0].witness[2].push(SigHashType::All as u8);
1357 htlc_timeout_tx.input[0].witness.push(Vec::new());
1358 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());
1360 add_dynamic_output!(htlc_timeout_tx, 0);
1361 res.push(htlc_timeout_tx);
1363 if let Some(payment_preimage) = self.payment_preimages.get(&htlc.payment_hash) {
1364 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);
1366 htlc_success_tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
1368 htlc_success_tx.input[0].witness.push(their_sig.serialize_der(&self.secp_ctx).to_vec());
1369 htlc_success_tx.input[0].witness[1].push(SigHashType::All as u8);
1370 htlc_success_tx.input[0].witness.push(our_sig.serialize_der(&self.secp_ctx).to_vec());
1371 htlc_success_tx.input[0].witness[2].push(SigHashType::All as u8);
1373 htlc_success_tx.input[0].witness.push(payment_preimage.to_vec());
1374 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());
1376 add_dynamic_output!(htlc_success_tx, 0);
1377 res.push(htlc_success_tx);
1382 (res, spendable_outputs)
1385 /// Attempts to claim any claimable HTLCs in a commitment transaction which was not (yet)
1386 /// revoked using data in local_claimable_outpoints.
1387 /// Should not be used if check_spend_revoked_transaction succeeds.
1388 fn check_spend_local_transaction(&self, tx: &Transaction, _height: u32) -> (Vec<Transaction>, Vec<SpendableOutputDescriptor>) {
1389 let commitment_txid = tx.txid();
1390 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
1391 if local_tx.txid == commitment_txid {
1392 match self.key_storage {
1393 Storage::Local { ref delayed_payment_base_key, ref latest_per_commitment_point, .. } => {
1394 return self.broadcast_by_local_state(local_tx, latest_per_commitment_point, &Some(*delayed_payment_base_key));
1396 Storage::Watchtower { .. } => {
1397 return self.broadcast_by_local_state(local_tx, &None, &None);
1402 if let &Some(ref local_tx) = &self.prev_local_signed_commitment_tx {
1403 if local_tx.txid == commitment_txid {
1404 match self.key_storage {
1405 Storage::Local { ref delayed_payment_base_key, ref prev_latest_per_commitment_point, .. } => {
1406 return self.broadcast_by_local_state(local_tx, prev_latest_per_commitment_point, &Some(*delayed_payment_base_key));
1408 Storage::Watchtower { .. } => {
1409 return self.broadcast_by_local_state(local_tx, &None, &None);
1414 (Vec::new(), Vec::new())
1417 /// Generate a spendable output event when closing_transaction get registered onchain.
1418 fn check_spend_closing_transaction(&self, tx: &Transaction) -> Option<SpendableOutputDescriptor> {
1419 if tx.input[0].sequence == 0xFFFFFFFF && !tx.input[0].witness.is_empty() && tx.input[0].witness.last().unwrap().len() == 71 {
1420 match self.key_storage {
1421 Storage::Local { ref shutdown_pubkey, .. } => {
1422 let our_channel_close_key_hash = Hash160::from_data(&shutdown_pubkey.serialize());
1423 let shutdown_script = Builder::new().push_opcode(opcodes::All::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script();
1424 for (idx, output) in tx.output.iter().enumerate() {
1425 if shutdown_script == output.script_pubkey {
1426 return Some(SpendableOutputDescriptor::StaticOutput {
1427 outpoint: BitcoinOutPoint { txid: tx.txid(), vout: idx as u32 },
1428 output: output.clone(),
1433 Storage::Watchtower { .. } => {
1434 //TODO: we need to ensure an offline client will generate the event when it
1435 // cames back online after only the watchtower saw the transaction
1442 /// Used by ChannelManager deserialization to broadcast the latest local state if it's copy of
1443 /// the Channel was out-of-date.
1444 pub(super) fn get_latest_local_commitment_txn(&self) -> Vec<Transaction> {
1445 if let &Some(ref local_tx) = &self.current_local_signed_commitment_tx {
1446 let mut res = vec![local_tx.tx.clone()];
1447 match self.key_storage {
1448 Storage::Local { ref delayed_payment_base_key, ref prev_latest_per_commitment_point, .. } => {
1449 res.append(&mut self.broadcast_by_local_state(local_tx, prev_latest_per_commitment_point, &Some(*delayed_payment_base_key)).0);
1451 _ => panic!("Can only broadcast by local channelmonitor"),
1459 fn block_connected(&mut self, txn_matched: &[&Transaction], height: u32, block_hash: &Sha256dHash, broadcaster: &BroadcasterInterface)-> (Vec<(Sha256dHash, Vec<TxOut>)>, Vec<SpendableOutputDescriptor>) {
1460 let mut watch_outputs = Vec::new();
1461 let mut spendable_outputs = Vec::new();
1462 for tx in txn_matched {
1463 if tx.input.len() == 1 {
1464 // Assuming our keys were not leaked (in which case we're screwed no matter what),
1465 // commitment transactions and HTLC transactions will all only ever have one input,
1466 // which is an easy way to filter out any potential non-matching txn for lazy
1468 let prevout = &tx.input[0].previous_output;
1469 let mut txn: Vec<Transaction> = Vec::new();
1470 let funding_txo = match self.key_storage {
1471 Storage::Local { ref funding_info, .. } => {
1472 funding_info.clone()
1474 Storage::Watchtower { .. } => {
1478 if funding_txo.is_none() || (prevout.txid == funding_txo.as_ref().unwrap().0.txid && prevout.vout == funding_txo.as_ref().unwrap().0.index as u32) {
1479 let (remote_txn, new_outputs, mut spendable_output) = self.check_spend_remote_transaction(tx, height);
1481 spendable_outputs.append(&mut spendable_output);
1482 if !new_outputs.1.is_empty() {
1483 watch_outputs.push(new_outputs);
1486 let (remote_txn, mut outputs) = self.check_spend_local_transaction(tx, height);
1487 spendable_outputs.append(&mut outputs);
1490 if !funding_txo.is_none() && txn.is_empty() {
1491 if let Some(spendable_output) = self.check_spend_closing_transaction(tx) {
1492 spendable_outputs.push(spendable_output);
1496 if let Some(&(commitment_number, _)) = self.remote_commitment_txn_on_chain.get(&prevout.txid) {
1497 let (tx, spendable_output) = self.check_spend_remote_htlc(tx, commitment_number);
1498 if let Some(tx) = tx {
1501 if let Some(spendable_output) = spendable_output {
1502 spendable_outputs.push(spendable_output);
1506 for tx in txn.iter() {
1507 broadcaster.broadcast_transaction(tx);
1511 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
1512 if self.would_broadcast_at_height(height) {
1513 broadcaster.broadcast_transaction(&cur_local_tx.tx);
1514 match self.key_storage {
1515 Storage::Local { ref delayed_payment_base_key, ref latest_per_commitment_point, .. } => {
1516 let (txs, mut outputs) = self.broadcast_by_local_state(&cur_local_tx, latest_per_commitment_point, &Some(*delayed_payment_base_key));
1517 spendable_outputs.append(&mut outputs);
1519 broadcaster.broadcast_transaction(&tx);
1522 Storage::Watchtower { .. } => {
1523 let (txs, mut outputs) = self.broadcast_by_local_state(&cur_local_tx, &None, &None);
1524 spendable_outputs.append(&mut outputs);
1526 broadcaster.broadcast_transaction(&tx);
1532 self.last_block_hash = block_hash.clone();
1533 (watch_outputs, spendable_outputs)
1536 pub(super) fn would_broadcast_at_height(&self, height: u32) -> bool {
1537 if let Some(ref cur_local_tx) = self.current_local_signed_commitment_tx {
1538 for &(ref htlc, _, _) in cur_local_tx.htlc_outputs.iter() {
1539 // For inbound HTLCs which we know the preimage for, we have to ensure we hit the
1540 // chain with enough room to claim the HTLC without our counterparty being able to
1541 // time out the HTLC first.
1542 // For outbound HTLCs which our counterparty hasn't failed/claimed, our primary
1543 // concern is being able to claim the corresponding inbound HTLC (on another
1544 // channel) before it expires. In fact, we don't even really care if our
1545 // counterparty here claims such an outbound HTLC after it expired as long as we
1546 // can still claim the corresponding HTLC. Thus, to avoid needlessly hitting the
1547 // chain when our counterparty is waiting for expiration to off-chain fail an HTLC
1548 // we give ourselves a few blocks of headroom after expiration before going
1549 // on-chain for an expired HTLC.
1550 // Note that, to avoid a potential attack whereby a node delays claiming an HTLC
1551 // from us until we've reached the point where we go on-chain with the
1552 // corresponding inbound HTLC, we must ensure that outbound HTLCs go on chain at
1553 // least CLTV_CLAIM_BUFFER blocks prior to the inbound HTLC.
1554 // aka outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS == height - CLTV_CLAIM_BUFFER
1555 // inbound_cltv == height + CLTV_CLAIM_BUFFER
1556 // outbound_cltv + HTLC_FAIL_TIMEOUT_BLOCKS + CLTV_CLAIM_BUFER <= inbound_cltv - CLTV_CLAIM_BUFFER
1557 // HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFER <= inbound_cltv - outbound_cltv
1558 // HTLC_FAIL_TIMEOUT_BLOCKS + 2*CLTV_CLAIM_BUFER <= CLTV_EXPIRY_DELTA
1559 if ( htlc.offered && htlc.cltv_expiry + HTLC_FAIL_TIMEOUT_BLOCKS <= height) ||
1560 (!htlc.offered && htlc.cltv_expiry <= height + CLTV_CLAIM_BUFFER && self.payment_preimages.contains_key(&htlc.payment_hash)) {
1569 const MAX_ALLOC_SIZE: usize = 64*1024;
1571 impl<R: ::std::io::Read> ReadableArgs<R, Arc<Logger>> for (Sha256dHash, ChannelMonitor) {
1572 fn read(reader: &mut R, logger: Arc<Logger>) -> Result<Self, DecodeError> {
1573 let secp_ctx = Secp256k1::new();
1574 macro_rules! unwrap_obj {
1578 Err(_) => return Err(DecodeError::InvalidValue),
1583 let _ver: u8 = Readable::read(reader)?;
1584 let min_ver: u8 = Readable::read(reader)?;
1585 if min_ver > SERIALIZATION_VERSION {
1586 return Err(DecodeError::UnknownVersion);
1589 let commitment_transaction_number_obscure_factor = <U48 as Readable<R>>::read(reader)?.0;
1591 let key_storage = match <u8 as Readable<R>>::read(reader)? {
1593 let revocation_base_key = Readable::read(reader)?;
1594 let htlc_base_key = Readable::read(reader)?;
1595 let delayed_payment_base_key = Readable::read(reader)?;
1596 let payment_base_key = Readable::read(reader)?;
1597 let shutdown_pubkey = Readable::read(reader)?;
1598 let prev_latest_per_commitment_point = match <u8 as Readable<R>>::read(reader)? {
1600 1 => Some(Readable::read(reader)?),
1601 _ => return Err(DecodeError::InvalidValue),
1603 let latest_per_commitment_point = match <u8 as Readable<R>>::read(reader)? {
1605 1 => Some(Readable::read(reader)?),
1606 _ => return Err(DecodeError::InvalidValue),
1608 // Technically this can fail and serialize fail a round-trip, but only for serialization of
1609 // barely-init'd ChannelMonitors that we can't do anything with.
1610 let outpoint = OutPoint {
1611 txid: Readable::read(reader)?,
1612 index: Readable::read(reader)?,
1614 let funding_info = Some((outpoint, Readable::read(reader)?));
1616 revocation_base_key,
1618 delayed_payment_base_key,
1621 prev_latest_per_commitment_point,
1622 latest_per_commitment_point,
1626 _ => return Err(DecodeError::InvalidValue),
1629 let their_htlc_base_key = Some(Readable::read(reader)?);
1630 let their_delayed_payment_base_key = Some(Readable::read(reader)?);
1632 let their_cur_revocation_points = {
1633 let first_idx = <U48 as Readable<R>>::read(reader)?.0;
1637 let first_point = Readable::read(reader)?;
1638 let second_point_slice: [u8; 33] = Readable::read(reader)?;
1639 if second_point_slice[0..32] == [0; 32] && second_point_slice[32] == 0 {
1640 Some((first_idx, first_point, None))
1642 Some((first_idx, first_point, Some(unwrap_obj!(PublicKey::from_slice(&secp_ctx, &second_point_slice)))))
1647 let our_to_self_delay: u16 = Readable::read(reader)?;
1648 let their_to_self_delay: Option<u16> = Some(Readable::read(reader)?);
1650 let mut old_secrets = [([0; 32], 1 << 48); 49];
1651 for &mut (ref mut secret, ref mut idx) in old_secrets.iter_mut() {
1652 *secret = Readable::read(reader)?;
1653 *idx = Readable::read(reader)?;
1656 macro_rules! read_htlc_in_commitment {
1659 let offered: bool = Readable::read(reader)?;
1660 let amount_msat: u64 = Readable::read(reader)?;
1661 let cltv_expiry: u32 = Readable::read(reader)?;
1662 let payment_hash: [u8; 32] = Readable::read(reader)?;
1663 let transaction_output_index: u32 = Readable::read(reader)?;
1665 HTLCOutputInCommitment {
1666 offered, amount_msat, cltv_expiry, payment_hash, transaction_output_index
1672 let remote_claimable_outpoints_len: u64 = Readable::read(reader)?;
1673 let mut remote_claimable_outpoints = HashMap::with_capacity(cmp::min(remote_claimable_outpoints_len as usize, MAX_ALLOC_SIZE / 64));
1674 for _ in 0..remote_claimable_outpoints_len {
1675 let txid: Sha256dHash = Readable::read(reader)?;
1676 let outputs_count: u64 = Readable::read(reader)?;
1677 let mut outputs = Vec::with_capacity(cmp::min(outputs_count as usize, MAX_ALLOC_SIZE / 32));
1678 for _ in 0..outputs_count {
1679 outputs.push(read_htlc_in_commitment!());
1681 if let Some(_) = remote_claimable_outpoints.insert(txid, outputs) {
1682 return Err(DecodeError::InvalidValue);
1686 let remote_commitment_txn_on_chain_len: u64 = Readable::read(reader)?;
1687 let mut remote_commitment_txn_on_chain = HashMap::with_capacity(cmp::min(remote_commitment_txn_on_chain_len as usize, MAX_ALLOC_SIZE / 32));
1688 for _ in 0..remote_commitment_txn_on_chain_len {
1689 let txid: Sha256dHash = Readable::read(reader)?;
1690 let commitment_number = <U48 as Readable<R>>::read(reader)?.0;
1691 let outputs_count = <u64 as Readable<R>>::read(reader)?;
1692 let mut outputs = Vec::with_capacity(cmp::min(outputs_count as usize, MAX_ALLOC_SIZE / 8));
1693 for _ in 0..outputs_count {
1694 outputs.push(Readable::read(reader)?);
1696 if let Some(_) = remote_commitment_txn_on_chain.insert(txid, (commitment_number, outputs)) {
1697 return Err(DecodeError::InvalidValue);
1701 let remote_hash_commitment_number_len: u64 = Readable::read(reader)?;
1702 let mut remote_hash_commitment_number = HashMap::with_capacity(cmp::min(remote_hash_commitment_number_len as usize, MAX_ALLOC_SIZE / 32));
1703 for _ in 0..remote_hash_commitment_number_len {
1704 let txid: [u8; 32] = Readable::read(reader)?;
1705 let commitment_number = <U48 as Readable<R>>::read(reader)?.0;
1706 if let Some(_) = remote_hash_commitment_number.insert(txid, commitment_number) {
1707 return Err(DecodeError::InvalidValue);
1711 macro_rules! read_local_tx {
1714 let tx = match Transaction::consensus_decode(reader.by_ref()) {
1717 encode::Error::Io(ioe) => return Err(DecodeError::Io(ioe)),
1718 _ => return Err(DecodeError::InvalidValue),
1722 if tx.input.is_empty() {
1723 // Ensure tx didn't hit the 0-input ambiguity case.
1724 return Err(DecodeError::InvalidValue);
1727 let revocation_key = Readable::read(reader)?;
1728 let a_htlc_key = Readable::read(reader)?;
1729 let b_htlc_key = Readable::read(reader)?;
1730 let delayed_payment_key = Readable::read(reader)?;
1731 let feerate_per_kw: u64 = Readable::read(reader)?;
1733 let htlc_outputs_len: u64 = Readable::read(reader)?;
1734 let mut htlc_outputs = Vec::with_capacity(cmp::min(htlc_outputs_len as usize, MAX_ALLOC_SIZE / 128));
1735 for _ in 0..htlc_outputs_len {
1736 htlc_outputs.push((read_htlc_in_commitment!(), Readable::read(reader)?, Readable::read(reader)?));
1741 tx, revocation_key, a_htlc_key, b_htlc_key, delayed_payment_key, feerate_per_kw, htlc_outputs
1747 let prev_local_signed_commitment_tx = match <u8 as Readable<R>>::read(reader)? {
1750 Some(read_local_tx!())
1752 _ => return Err(DecodeError::InvalidValue),
1755 let current_local_signed_commitment_tx = match <u8 as Readable<R>>::read(reader)? {
1758 Some(read_local_tx!())
1760 _ => return Err(DecodeError::InvalidValue),
1763 let current_remote_commitment_number = <U48 as Readable<R>>::read(reader)?.0;
1765 let payment_preimages_len: u64 = Readable::read(reader)?;
1766 let mut payment_preimages = HashMap::with_capacity(cmp::min(payment_preimages_len as usize, MAX_ALLOC_SIZE / 32));
1767 let mut sha = Sha256::new();
1768 for _ in 0..payment_preimages_len {
1769 let preimage: [u8; 32] = Readable::read(reader)?;
1771 sha.input(&preimage);
1772 let mut hash = [0; 32];
1773 sha.result(&mut hash);
1774 if let Some(_) = payment_preimages.insert(hash, preimage) {
1775 return Err(DecodeError::InvalidValue);
1779 let last_block_hash: Sha256dHash = Readable::read(reader)?;
1780 let destination_script = Readable::read(reader)?;
1782 Ok((last_block_hash.clone(), ChannelMonitor {
1783 commitment_transaction_number_obscure_factor,
1786 their_htlc_base_key,
1787 their_delayed_payment_base_key,
1788 their_cur_revocation_points,
1791 their_to_self_delay,
1794 remote_claimable_outpoints,
1795 remote_commitment_txn_on_chain,
1796 remote_hash_commitment_number,
1798 prev_local_signed_commitment_tx,
1799 current_local_signed_commitment_tx,
1800 current_remote_commitment_number,
1815 use bitcoin::blockdata::script::Script;
1816 use bitcoin::blockdata::transaction::Transaction;
1817 use crypto::digest::Digest;
1819 use ln::channelmonitor::ChannelMonitor;
1820 use ln::chan_utils::{HTLCOutputInCommitment, TxCreationKeys};
1821 use util::sha2::Sha256;
1822 use util::test_utils::TestLogger;
1823 use secp256k1::key::{SecretKey,PublicKey};
1824 use secp256k1::{Secp256k1, Signature};
1825 use rand::{thread_rng,Rng};
1829 fn test_per_commitment_storage() {
1830 // Test vectors from BOLT 3:
1831 let mut secrets: Vec<[u8; 32]> = Vec::new();
1832 let mut monitor: ChannelMonitor;
1833 let secp_ctx = Secp256k1::new();
1834 let logger = Arc::new(TestLogger::new());
1836 macro_rules! test_secrets {
1838 let mut idx = 281474976710655;
1839 for secret in secrets.iter() {
1840 assert_eq!(monitor.get_secret(idx).unwrap(), *secret);
1843 assert_eq!(monitor.get_min_seen_secret(), idx + 1);
1844 assert!(monitor.get_secret(idx).is_none());
1849 // insert_secret correct sequence
1850 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());
1853 secrets.push([0; 32]);
1854 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1855 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1858 secrets.push([0; 32]);
1859 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1860 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1863 secrets.push([0; 32]);
1864 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1865 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1868 secrets.push([0; 32]);
1869 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1870 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
1873 secrets.push([0; 32]);
1874 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1875 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
1878 secrets.push([0; 32]);
1879 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1880 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
1883 secrets.push([0; 32]);
1884 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1885 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
1888 secrets.push([0; 32]);
1889 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
1890 monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap();
1895 // insert_secret #1 incorrect
1896 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());
1899 secrets.push([0; 32]);
1900 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1901 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1904 secrets.push([0; 32]);
1905 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1906 assert_eq!(monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap_err().0,
1907 "Previous secret did not match new one");
1911 // insert_secret #2 incorrect (#1 derived from incorrect)
1912 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());
1915 secrets.push([0; 32]);
1916 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1917 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1920 secrets.push([0; 32]);
1921 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
1922 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1925 secrets.push([0; 32]);
1926 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
1927 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1930 secrets.push([0; 32]);
1931 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1932 assert_eq!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap_err().0,
1933 "Previous secret did not match new one");
1937 // insert_secret #3 incorrect
1938 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());
1941 secrets.push([0; 32]);
1942 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
1943 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1946 secrets.push([0; 32]);
1947 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
1948 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1951 secrets.push([0; 32]);
1952 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
1953 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1956 secrets.push([0; 32]);
1957 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
1958 assert_eq!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap_err().0,
1959 "Previous secret did not match new one");
1963 // insert_secret #4 incorrect (1,2,3 derived from incorrect)
1964 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());
1967 secrets.push([0; 32]);
1968 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
1969 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
1972 secrets.push([0; 32]);
1973 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
1974 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
1977 secrets.push([0; 32]);
1978 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
1979 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
1982 secrets.push([0; 32]);
1983 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("ba65d7b0ef55a3ba300d4e87af29868f394f8f138d78a7011669c79b37b936f4").unwrap());
1984 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
1987 secrets.push([0; 32]);
1988 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
1989 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
1992 secrets.push([0; 32]);
1993 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
1994 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
1997 secrets.push([0; 32]);
1998 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
1999 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2002 secrets.push([0; 32]);
2003 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
2004 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2005 "Previous secret did not match new one");
2009 // insert_secret #5 incorrect
2010 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());
2013 secrets.push([0; 32]);
2014 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2015 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2018 secrets.push([0; 32]);
2019 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2020 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2023 secrets.push([0; 32]);
2024 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2025 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2028 secrets.push([0; 32]);
2029 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2030 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2033 secrets.push([0; 32]);
2034 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
2035 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2038 secrets.push([0; 32]);
2039 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
2040 assert_eq!(monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap_err().0,
2041 "Previous secret did not match new one");
2045 // insert_secret #6 incorrect (5 derived from incorrect)
2046 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());
2049 secrets.push([0; 32]);
2050 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2051 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2054 secrets.push([0; 32]);
2055 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2056 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2059 secrets.push([0; 32]);
2060 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2061 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2064 secrets.push([0; 32]);
2065 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2066 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2069 secrets.push([0; 32]);
2070 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
2071 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2074 secrets.push([0; 32]);
2075 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("b7e76a83668bde38b373970155c868a653304308f9896692f904a23731224bb1").unwrap());
2076 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
2079 secrets.push([0; 32]);
2080 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
2081 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2084 secrets.push([0; 32]);
2085 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
2086 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2087 "Previous secret did not match new one");
2091 // insert_secret #7 incorrect
2092 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());
2095 secrets.push([0; 32]);
2096 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2097 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2100 secrets.push([0; 32]);
2101 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2102 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2105 secrets.push([0; 32]);
2106 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2107 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2110 secrets.push([0; 32]);
2111 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2112 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2115 secrets.push([0; 32]);
2116 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
2117 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2120 secrets.push([0; 32]);
2121 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
2122 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
2125 secrets.push([0; 32]);
2126 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("e7971de736e01da8ed58b94c2fc216cb1dca9e326f3a96e7194fe8ea8af6c0a3").unwrap());
2127 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2130 secrets.push([0; 32]);
2131 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
2132 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2133 "Previous secret did not match new one");
2137 // insert_secret #8 incorrect
2138 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());
2141 secrets.push([0; 32]);
2142 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2143 monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
2146 secrets.push([0; 32]);
2147 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2148 monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
2151 secrets.push([0; 32]);
2152 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2153 monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
2156 secrets.push([0; 32]);
2157 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2158 monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
2161 secrets.push([0; 32]);
2162 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
2163 monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
2166 secrets.push([0; 32]);
2167 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
2168 monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
2171 secrets.push([0; 32]);
2172 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
2173 monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
2176 secrets.push([0; 32]);
2177 secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a7efbc61aac46d34f77778bac22c8a20c6a46ca460addc49009bda875ec88fa4").unwrap());
2178 assert_eq!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap_err().0,
2179 "Previous secret did not match new one");
2184 fn test_prune_preimages() {
2185 let secp_ctx = Secp256k1::new();
2186 let logger = Arc::new(TestLogger::new());
2187 let dummy_sig = Signature::from_der(&secp_ctx, &hex::decode("3045022100fa86fa9a36a8cd6a7bb8f06a541787d51371d067951a9461d5404de6b928782e02201c8b7c334c10aed8976a3a465be9a28abff4cb23acbf00022295b378ce1fa3cd").unwrap()[..]).unwrap();
2189 let dummy_key = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &[42; 32]).unwrap());
2190 macro_rules! dummy_keys {
2194 per_commitment_point: dummy_key.clone(),
2195 revocation_key: dummy_key.clone(),
2196 a_htlc_key: dummy_key.clone(),
2197 b_htlc_key: dummy_key.clone(),
2198 a_delayed_payment_key: dummy_key.clone(),
2199 b_payment_key: dummy_key.clone(),
2204 let dummy_tx = Transaction { version: 0, lock_time: 0, input: Vec::new(), output: Vec::new() };
2206 let mut preimages = Vec::new();
2208 let mut rng = thread_rng();
2210 let mut preimage = [0; 32];
2211 rng.fill_bytes(&mut preimage);
2212 let mut sha = Sha256::new();
2213 sha.input(&preimage);
2214 let mut hash = [0; 32];
2215 sha.result(&mut hash);
2216 preimages.push((preimage, hash));
2220 macro_rules! preimages_slice_to_htlc_outputs {
2221 ($preimages_slice: expr) => {
2223 let mut res = Vec::new();
2224 for (idx, preimage) in $preimages_slice.iter().enumerate() {
2225 res.push(HTLCOutputInCommitment {
2229 payment_hash: preimage.1.clone(),
2230 transaction_output_index: idx as u32,
2237 macro_rules! preimages_to_local_htlcs {
2238 ($preimages_slice: expr) => {
2240 let mut inp = preimages_slice_to_htlc_outputs!($preimages_slice);
2241 let res: Vec<_> = inp.drain(..).map(|e| { (e, dummy_sig.clone(), dummy_sig.clone()) }).collect();
2247 macro_rules! test_preimages_exist {
2248 ($preimages_slice: expr, $monitor: expr) => {
2249 for preimage in $preimages_slice {
2250 assert!($monitor.payment_preimages.contains_key(&preimage.1));
2255 // Prune with one old state and a local commitment tx holding a few overlaps with the
2257 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());
2258 monitor.set_their_to_self_delay(10);
2260 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..10]));
2261 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[5..15]), 281474976710655, dummy_key);
2262 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[15..20]), 281474976710654, dummy_key);
2263 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[17..20]), 281474976710653, dummy_key);
2264 monitor.provide_latest_remote_commitment_tx_info(&dummy_tx, preimages_slice_to_htlc_outputs!(preimages[18..20]), 281474976710652, dummy_key);
2265 for &(ref preimage, ref hash) in preimages.iter() {
2266 monitor.provide_payment_preimage(hash, preimage);
2269 // Now provide a secret, pruning preimages 10-15
2270 let mut secret = [0; 32];
2271 secret[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
2272 monitor.provide_secret(281474976710655, secret.clone()).unwrap();
2273 assert_eq!(monitor.payment_preimages.len(), 15);
2274 test_preimages_exist!(&preimages[0..10], monitor);
2275 test_preimages_exist!(&preimages[15..20], monitor);
2277 // Now provide a further secret, pruning preimages 15-17
2278 secret[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
2279 monitor.provide_secret(281474976710654, secret.clone()).unwrap();
2280 assert_eq!(monitor.payment_preimages.len(), 13);
2281 test_preimages_exist!(&preimages[0..10], monitor);
2282 test_preimages_exist!(&preimages[17..20], monitor);
2284 // Now update local commitment tx info, pruning only element 18 as we still care about the
2285 // previous commitment tx's preimages too
2286 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..5]));
2287 secret[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
2288 monitor.provide_secret(281474976710653, secret.clone()).unwrap();
2289 assert_eq!(monitor.payment_preimages.len(), 12);
2290 test_preimages_exist!(&preimages[0..10], monitor);
2291 test_preimages_exist!(&preimages[18..20], monitor);
2293 // But if we do it again, we'll prune 5-10
2294 monitor.provide_latest_local_commitment_tx_info(dummy_tx.clone(), dummy_keys!(), 0, preimages_to_local_htlcs!(preimages[0..3]));
2295 secret[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
2296 monitor.provide_secret(281474976710652, secret.clone()).unwrap();
2297 assert_eq!(monitor.payment_preimages.len(), 5);
2298 test_preimages_exist!(&preimages[0..5], monitor);
2301 // Further testing is done in the ChannelManager integration tests.