_ Git - rust-lightning/blob - lightning/src/ln/chan_utils.rs

   1 //! Various utilities for building scripts and deriving keys related to channels. These are
   2 //! largely of interest for those implementing chain::keysinterface::ChannelKeys message signing
   3 //! by hand.
   4
   5 use bitcoin::blockdata::script::{Script,Builder};
   6 use bitcoin::blockdata::opcodes;
   7 use bitcoin::blockdata::transaction::{TxIn,TxOut,OutPoint,Transaction, SigHashType};
   8 use bitcoin::consensus::encode::{self, Decodable, Encodable};
   9 use bitcoin::util::bip143;
  10
  11 use bitcoin_hashes::{Hash, HashEngine};
  12 use bitcoin_hashes::sha256::Hash as Sha256;
  13 use bitcoin_hashes::ripemd160::Hash as Ripemd160;
  14 use bitcoin_hashes::hash160::Hash as Hash160;
  15 use bitcoin_hashes::sha256d::Hash as Sha256dHash;
  16
  17 use ln::channelmanager::{PaymentHash, PaymentPreimage};
  18 use ln::msgs::DecodeError;
  19 use util::ser::{Readable, Writeable, Writer, WriterWriteAdaptor};
  20 use util::byte_utils;
  21
  22 use secp256k1::key::{SecretKey, PublicKey};
  23 use secp256k1::{Secp256k1, Signature};
  24 use secp256k1;
  25
  26 pub(super) const HTLC_SUCCESS_TX_WEIGHT: u64 = 703;
  27 pub(super) const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663;
  28
  29 #[derive(PartialEq)]
  30 pub(crate) enum HTLCType {
  31         AcceptedHTLC,
  32         OfferedHTLC
  33 }
  34
  35 impl HTLCType {
  36         /// Check if a given tx witnessScript len matchs one of a pre-signed HTLC
  37         pub(crate) fn scriptlen_to_htlctype(witness_script_len: usize) ->  Option<HTLCType> {
  38                 if witness_script_len == 133 {
  39                         Some(HTLCType::OfferedHTLC)
  40                 } else if witness_script_len >= 136 && witness_script_len <= 139 {
  41                         Some(HTLCType::AcceptedHTLC)
  42                 } else {
  43                         None
  44                 }
  45         }
  46 }
  47
  48 // Various functions for key derivation and transaction creation for use within channels. Primarily
  49 // used in Channel and ChannelMonitor.
  50
  51 pub(super) fn build_commitment_secret(commitment_seed: &[u8; 32], idx: u64) -> [u8; 32] {
  52         let mut res: [u8; 32] = commitment_seed.clone();
  53         for i in 0..48 {
  54                 let bitpos = 47 - i;
  55                 if idx & (1 << bitpos) == (1 << bitpos) {
  56                         res[bitpos / 8] ^= 1 << (bitpos & 7);
  57                         res = Sha256::hash(&res).into_inner();
  58                 }
  59         }
  60         res
  61 }
  62
  63 /// Implements the per-commitment secret storage scheme from
  64 /// [BOLT 3](https://github.com/lightningnetwork/lightning-rfc/blob/dcbf8583976df087c79c3ce0b535311212e6812d/03-transactions.md#efficient-per-commitment-secret-storage).
  65 ///
  66 /// Allows us to keep track of all of the revocation secrets of counterarties in just 50*32 bytes
  67 /// or so.
  68 #[derive(Clone)]
  69 pub(super) struct CounterpartyCommitmentSecrets {
  70         old_secrets: [([u8; 32], u64); 49],
  71 }
  72
  73 impl PartialEq for CounterpartyCommitmentSecrets {
  74         fn eq(&self, other: &Self) -> bool {
  75                 for (&(ref secret, ref idx), &(ref o_secret, ref o_idx)) in self.old_secrets.iter().zip(other.old_secrets.iter()) {
  76                         if secret != o_secret || idx != o_idx {
  77                                 return false
  78                         }
  79                 }
  80                 true
  81         }
  82 }
  83
  84 impl CounterpartyCommitmentSecrets {
  85         pub(super) fn new() -> Self {
  86                 Self { old_secrets: [([0; 32], 1 << 48); 49], }
  87         }
  88
  89         #[inline]
  90         fn place_secret(idx: u64) -> u8 {
  91                 for i in 0..48 {
  92                         if idx & (1 << i) == (1 << i) {
  93                                 return i
  94                         }
  95                 }
  96                 48
  97         }
  98
  99         pub(super) fn get_min_seen_secret(&self) -> u64 {
 100                 //TODO This can be optimized?
 101                 let mut min = 1 << 48;
 102                 for &(_, idx) in self.old_secrets.iter() {
 103                         if idx < min {
 104                                 min = idx;
 105                         }
 106                 }
 107                 min
 108         }
 109
 110         #[inline]
 111         pub(super) fn derive_secret(secret: [u8; 32], bits: u8, idx: u64) -> [u8; 32] {
 112                 let mut res: [u8; 32] = secret;
 113                 for i in 0..bits {
 114                         let bitpos = bits - 1 - i;
 115                         if idx & (1 << bitpos) == (1 << bitpos) {
 116                                 res[(bitpos / 8) as usize] ^= 1 << (bitpos & 7);
 117                                 res = Sha256::hash(&res).into_inner();
 118                         }
 119                 }
 120                 res
 121         }
 122
 123         pub(super) fn provide_secret(&mut self, idx: u64, secret: [u8; 32]) -> Result<(), ()> {
 124                 let pos = Self::place_secret(idx);
 125                 for i in 0..pos {
 126                         let (old_secret, old_idx) = self.old_secrets[i as usize];
 127                         if Self::derive_secret(secret, pos, old_idx) != old_secret {
 128                                 return Err(());
 129                         }
 130                 }
 131                 if self.get_min_seen_secret() <= idx {
 132                         return Ok(());
 133                 }
 134                 self.old_secrets[pos as usize] = (secret, idx);
 135                 Ok(())
 136         }
 137
 138         /// Can only fail if idx is < get_min_seen_secret
 139         pub(super) fn get_secret(&self, idx: u64) -> Option<[u8; 32]> {
 140                 for i in 0..self.old_secrets.len() {
 141                         if (idx & (!((1 << i) - 1))) == self.old_secrets[i].1 {
 142                                 return Some(Self::derive_secret(self.old_secrets[i].0, i as u8, idx))
 143                         }
 144                 }
 145                 assert!(idx < self.get_min_seen_secret());
 146                 None
 147         }
 148 }
 149
 150 impl Writeable for CounterpartyCommitmentSecrets {
 151         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 152                 for &(ref secret, ref idx) in self.old_secrets.iter() {
 153                         writer.write_all(secret)?;
 154                         writer.write_all(&byte_utils::be64_to_array(*idx))?;
 155                 }
 156                 Ok(())
 157         }
 158 }
 159 impl<R: ::std::io::Read> Readable<R> for CounterpartyCommitmentSecrets {
 160         fn read(reader: &mut R) -> Result<Self, DecodeError> {
 161                 let mut old_secrets = [([0; 32], 1 << 48); 49];
 162                 for &mut (ref mut secret, ref mut idx) in old_secrets.iter_mut() {
 163                         *secret = Readable::read(reader)?;
 164                         *idx = Readable::read(reader)?;
 165                 }
 166
 167                 Ok(Self { old_secrets })
 168         }
 169 }
 170
 171 /// Derives a per-commitment-transaction private key (eg an htlc key or payment key) from the base
 172 /// private key for that type of key and the per_commitment_point (available in TxCreationKeys)
 173 pub fn derive_private_key<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, base_secret: &SecretKey) -> Result<SecretKey, secp256k1::Error> {
 174         let mut sha = Sha256::engine();
 175         sha.input(&per_commitment_point.serialize());
 176         sha.input(&PublicKey::from_secret_key(&secp_ctx, &base_secret).serialize());
 177         let res = Sha256::from_engine(sha).into_inner();
 178
 179         let mut key = base_secret.clone();
 180         key.add_assign(&res)?;
 181         Ok(key)
 182 }
 183
 184 pub(super) fn derive_public_key<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, base_point: &PublicKey) -> Result<PublicKey, secp256k1::Error> {
 185         let mut sha = Sha256::engine();
 186         sha.input(&per_commitment_point.serialize());
 187         sha.input(&base_point.serialize());
 188         let res = Sha256::from_engine(sha).into_inner();
 189
 190         let hashkey = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&res)?);
 191         base_point.combine(&hashkey)
 192 }
 193
 194 /// Derives a revocation key from its constituent parts.
 195 /// Note that this is infallible iff we trust that at least one of the two input keys are randomly
 196 /// generated (ie our own).
 197 pub(super) fn derive_private_revocation_key<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, per_commitment_secret: &SecretKey, revocation_base_secret: &SecretKey) -> Result<SecretKey, secp256k1::Error> {
 198         let revocation_base_point = PublicKey::from_secret_key(&secp_ctx, &revocation_base_secret);
 199         let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
 200
 201         let rev_append_commit_hash_key = {
 202                 let mut sha = Sha256::engine();
 203                 sha.input(&revocation_base_point.serialize());
 204                 sha.input(&per_commitment_point.serialize());
 205
 206                 Sha256::from_engine(sha).into_inner()
 207         };
 208         let commit_append_rev_hash_key = {
 209                 let mut sha = Sha256::engine();
 210                 sha.input(&per_commitment_point.serialize());
 211                 sha.input(&revocation_base_point.serialize());
 212
 213                 Sha256::from_engine(sha).into_inner()
 214         };
 215
 216         let mut part_a = revocation_base_secret.clone();
 217         part_a.mul_assign(&rev_append_commit_hash_key)?;
 218         let mut part_b = per_commitment_secret.clone();
 219         part_b.mul_assign(&commit_append_rev_hash_key)?;
 220         part_a.add_assign(&part_b[..])?;
 221         Ok(part_a)
 222 }
 223
 224 pub(super) fn derive_public_revocation_key<T: secp256k1::Verification>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, revocation_base_point: &PublicKey) -> Result<PublicKey, secp256k1::Error> {
 225         let rev_append_commit_hash_key = {
 226                 let mut sha = Sha256::engine();
 227                 sha.input(&revocation_base_point.serialize());
 228                 sha.input(&per_commitment_point.serialize());
 229
 230                 Sha256::from_engine(sha).into_inner()
 231         };
 232         let commit_append_rev_hash_key = {
 233                 let mut sha = Sha256::engine();
 234                 sha.input(&per_commitment_point.serialize());
 235                 sha.input(&revocation_base_point.serialize());
 236
 237                 Sha256::from_engine(sha).into_inner()
 238         };
 239
 240         let mut part_a = revocation_base_point.clone();
 241         part_a.mul_assign(&secp_ctx, &rev_append_commit_hash_key)?;
 242         let mut part_b = per_commitment_point.clone();
 243         part_b.mul_assign(&secp_ctx, &commit_append_rev_hash_key)?;
 244         part_a.combine(&part_b)
 245 }
 246
 247 /// The set of public keys which are used in the creation of one commitment transaction.
 248 /// These are derived from the channel base keys and per-commitment data.
 249 #[derive(PartialEq, Clone)]
 250 pub struct TxCreationKeys {
 251         /// The per-commitment public key which was used to derive the other keys.
 252         pub per_commitment_point: PublicKey,
 253         /// The revocation key which is used to allow the owner of the commitment transaction to
 254         /// provide their counterparty the ability to punish them if they broadcast an old state.
 255         pub(crate) revocation_key: PublicKey,
 256         /// A's HTLC Key
 257         pub(crate) a_htlc_key: PublicKey,
 258         /// B's HTLC Key
 259         pub(crate) b_htlc_key: PublicKey,
 260         /// A's Payment Key (which isn't allowed to be spent from for some delay)
 261         pub(crate) a_delayed_payment_key: PublicKey,
 262         /// B's Payment Key
 263         pub(crate) b_payment_key: PublicKey,
 264 }
 265 impl_writeable!(TxCreationKeys, 33*6,
 266         { per_commitment_point, revocation_key, a_htlc_key, b_htlc_key, a_delayed_payment_key, b_payment_key });
 267
 268 /// One counterparty's public keys which do not change over the life of a channel.
 269 #[derive(Clone, PartialEq)]
 270 pub struct ChannelPublicKeys {
 271         /// The public key which is used to sign all commitment transactions, as it appears in the
 272         /// on-chain channel lock-in 2-of-2 multisig output.
 273         pub funding_pubkey: PublicKey,
 274         /// The base point which is used (with derive_public_revocation_key) to derive per-commitment
 275         /// revocation keys. The per-commitment revocation private key is then revealed by the owner of
 276         /// a commitment transaction so that their counterparty can claim all available funds if they
 277         /// broadcast an old state.
 278         pub revocation_basepoint: PublicKey,
 279         /// The base point which is used (with derive_public_key) to derive a per-commitment payment
 280         /// public key which receives immediately-spendable non-HTLC-encumbered funds.
 281         pub payment_basepoint: PublicKey,
 282         /// The base point which is used (with derive_public_key) to derive a per-commitment payment
 283         /// public key which receives non-HTLC-encumbered funds which are only available for spending
 284         /// after some delay (or can be claimed via the revocation path).
 285         pub delayed_payment_basepoint: PublicKey,
 286         /// The base point which is used (with derive_public_key) to derive a per-commitment public key
 287         /// which is used to encumber HTLC-in-flight outputs.
 288         pub htlc_basepoint: PublicKey,
 289 }
 290
 291 impl_writeable!(ChannelPublicKeys, 33*5, {
 292         funding_pubkey,
 293         revocation_basepoint,
 294         payment_basepoint,
 295         delayed_payment_basepoint,
 296         htlc_basepoint
 297 });
 298
 299
 300 impl TxCreationKeys {
 301         pub(crate) fn new<T: secp256k1::Signing + secp256k1::Verification>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, a_delayed_payment_base: &PublicKey, a_htlc_base: &PublicKey, b_revocation_base: &PublicKey, b_payment_base: &PublicKey, b_htlc_base: &PublicKey) -> Result<TxCreationKeys, secp256k1::Error> {
 302                 Ok(TxCreationKeys {
 303                         per_commitment_point: per_commitment_point.clone(),
 304                         revocation_key: derive_public_revocation_key(&secp_ctx, &per_commitment_point, &b_revocation_base)?,
 305                         a_htlc_key: derive_public_key(&secp_ctx, &per_commitment_point, &a_htlc_base)?,
 306                         b_htlc_key: derive_public_key(&secp_ctx, &per_commitment_point, &b_htlc_base)?,
 307                         a_delayed_payment_key: derive_public_key(&secp_ctx, &per_commitment_point, &a_delayed_payment_base)?,
 308                         b_payment_key: derive_public_key(&secp_ctx, &per_commitment_point, &b_payment_base)?,
 309                 })
 310         }
 311 }
 312
 313 /// Gets the "to_local" output redeemscript, ie the script which is time-locked or spendable by
 314 /// the revocation key
 315 pub(super) fn get_revokeable_redeemscript(revocation_key: &PublicKey, to_self_delay: u16, delayed_payment_key: &PublicKey) -> Script {
 316         Builder::new().push_opcode(opcodes::all::OP_IF)
 317                       .push_slice(&revocation_key.serialize())
 318                       .push_opcode(opcodes::all::OP_ELSE)
 319                       .push_int(to_self_delay as i64)
 320                       .push_opcode(opcodes::all::OP_CSV)
 321                       .push_opcode(opcodes::all::OP_DROP)
 322                       .push_slice(&delayed_payment_key.serialize())
 323                       .push_opcode(opcodes::all::OP_ENDIF)
 324                       .push_opcode(opcodes::all::OP_CHECKSIG)
 325                       .into_script()
 326 }
 327
 328 #[derive(Clone, PartialEq)]
 329 /// Information about an HTLC as it appears in a commitment transaction
 330 pub struct HTLCOutputInCommitment {
 331         /// Whether the HTLC was "offered" (ie outbound in relation to this commitment transaction).
 332         /// Note that this is not the same as whether it is ountbound *from us*. To determine that you
 333         /// need to compare this value to whether the commitment transaction in question is that of
 334         /// the remote party or our own.
 335         pub offered: bool,
 336         /// The value, in msat, of the HTLC. The value as it appears in the commitment transaction is
 337         /// this divided by 1000.
 338         pub amount_msat: u64,
 339         /// The CLTV lock-time at which this HTLC expires.
 340         pub cltv_expiry: u32,
 341         /// The hash of the preimage which unlocks this HTLC.
 342         pub payment_hash: PaymentHash,
 343         /// The position within the commitment transactions' outputs. This may be None if the value is
 344         /// below the dust limit (in which case no output appears in the commitment transaction and the
 345         /// value is spent to additional transaction fees).
 346         pub transaction_output_index: Option<u32>,
 347 }
 348
 349 impl_writeable!(HTLCOutputInCommitment, 1 + 8 + 4 + 32 + 5, {
 350         offered,
 351         amount_msat,
 352         cltv_expiry,
 353         payment_hash,
 354         transaction_output_index
 355 });
 356
 357 #[inline]
 358 pub(super) fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, a_htlc_key: &PublicKey, b_htlc_key: &PublicKey, revocation_key: &PublicKey) -> Script {
 359         let payment_hash160 = Ripemd160::hash(&htlc.payment_hash.0[..]).into_inner();
 360         if htlc.offered {
 361                 Builder::new().push_opcode(opcodes::all::OP_DUP)
 362                               .push_opcode(opcodes::all::OP_HASH160)
 363                               .push_slice(&Hash160::hash(&revocation_key.serialize())[..])
 364                               .push_opcode(opcodes::all::OP_EQUAL)
 365                               .push_opcode(opcodes::all::OP_IF)
 366                               .push_opcode(opcodes::all::OP_CHECKSIG)
 367                               .push_opcode(opcodes::all::OP_ELSE)
 368                               .push_slice(&b_htlc_key.serialize()[..])
 369                               .push_opcode(opcodes::all::OP_SWAP)
 370                               .push_opcode(opcodes::all::OP_SIZE)
 371                               .push_int(32)
 372                               .push_opcode(opcodes::all::OP_EQUAL)
 373                               .push_opcode(opcodes::all::OP_NOTIF)
 374                               .push_opcode(opcodes::all::OP_DROP)
 375                               .push_int(2)
 376                               .push_opcode(opcodes::all::OP_SWAP)
 377                               .push_slice(&a_htlc_key.serialize()[..])
 378                               .push_int(2)
 379                               .push_opcode(opcodes::all::OP_CHECKMULTISIG)
 380                               .push_opcode(opcodes::all::OP_ELSE)
 381                               .push_opcode(opcodes::all::OP_HASH160)
 382                               .push_slice(&payment_hash160)
 383                               .push_opcode(opcodes::all::OP_EQUALVERIFY)
 384                               .push_opcode(opcodes::all::OP_CHECKSIG)
 385                               .push_opcode(opcodes::all::OP_ENDIF)
 386                               .push_opcode(opcodes::all::OP_ENDIF)
 387                               .into_script()
 388         } else {
 389                 Builder::new().push_opcode(opcodes::all::OP_DUP)
 390                               .push_opcode(opcodes::all::OP_HASH160)
 391                               .push_slice(&Hash160::hash(&revocation_key.serialize())[..])
 392                               .push_opcode(opcodes::all::OP_EQUAL)
 393                               .push_opcode(opcodes::all::OP_IF)
 394                               .push_opcode(opcodes::all::OP_CHECKSIG)
 395                               .push_opcode(opcodes::all::OP_ELSE)
 396                               .push_slice(&b_htlc_key.serialize()[..])
 397                               .push_opcode(opcodes::all::OP_SWAP)
 398                               .push_opcode(opcodes::all::OP_SIZE)
 399                               .push_int(32)
 400                               .push_opcode(opcodes::all::OP_EQUAL)
 401                               .push_opcode(opcodes::all::OP_IF)
 402                               .push_opcode(opcodes::all::OP_HASH160)
 403                               .push_slice(&payment_hash160)
 404                               .push_opcode(opcodes::all::OP_EQUALVERIFY)
 405                               .push_int(2)
 406                               .push_opcode(opcodes::all::OP_SWAP)
 407                               .push_slice(&a_htlc_key.serialize()[..])
 408                               .push_int(2)
 409                               .push_opcode(opcodes::all::OP_CHECKMULTISIG)
 410                               .push_opcode(opcodes::all::OP_ELSE)
 411                               .push_opcode(opcodes::all::OP_DROP)
 412                               .push_int(htlc.cltv_expiry as i64)
 413                               .push_opcode(opcodes::all::OP_CLTV)
 414                               .push_opcode(opcodes::all::OP_DROP)
 415                               .push_opcode(opcodes::all::OP_CHECKSIG)
 416                               .push_opcode(opcodes::all::OP_ENDIF)
 417                               .push_opcode(opcodes::all::OP_ENDIF)
 418                               .into_script()
 419         }
 420 }
 421
 422 /// note here that 'a_revocation_key' is generated using b_revocation_basepoint and a's
 423 /// commitment secret. 'htlc' does *not* need to have its previous_output_index filled.
 424 #[inline]
 425 pub fn get_htlc_redeemscript(htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Script {
 426         get_htlc_redeemscript_with_explicit_keys(htlc, &keys.a_htlc_key, &keys.b_htlc_key, &keys.revocation_key)
 427 }
 428
 429 /// Gets the redeemscript for a funding output from the two funding public keys.
 430 /// Note that the order of funding public keys does not matter.
 431 pub fn make_funding_redeemscript(a: &PublicKey, b: &PublicKey) -> Script {
 432         let our_funding_key = a.serialize();
 433         let their_funding_key = b.serialize();
 434
 435         let builder = Builder::new().push_opcode(opcodes::all::OP_PUSHNUM_2);
 436         if our_funding_key[..] < their_funding_key[..] {
 437                 builder.push_slice(&our_funding_key)
 438                         .push_slice(&their_funding_key)
 439         } else {
 440                 builder.push_slice(&their_funding_key)
 441                         .push_slice(&our_funding_key)
 442         }.push_opcode(opcodes::all::OP_PUSHNUM_2).push_opcode(opcodes::all::OP_CHECKMULTISIG).into_script()
 443 }
 444
 445 /// panics if htlc.transaction_output_index.is_none()!
 446 pub fn build_htlc_transaction(prev_hash: &Sha256dHash, feerate_per_kw: u64, to_self_delay: u16, htlc: &HTLCOutputInCommitment, a_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
 447         let mut txins: Vec<TxIn> = Vec::new();
 448         txins.push(TxIn {
 449                 previous_output: OutPoint {
 450                         txid: prev_hash.clone(),
 451                         vout: htlc.transaction_output_index.expect("Can't build an HTLC transaction for a dust output"),
 452                 },
 453                 script_sig: Script::new(),
 454                 sequence: 0,
 455                 witness: Vec::new(),
 456         });
 457
 458         let total_fee = if htlc.offered {
 459                         feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000
 460                 } else {
 461                         feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000
 462                 };
 463
 464         let mut txouts: Vec<TxOut> = Vec::new();
 465         txouts.push(TxOut {
 466                 script_pubkey: get_revokeable_redeemscript(revocation_key, to_self_delay, a_delayed_payment_key).to_v0_p2wsh(),
 467                 value: htlc.amount_msat / 1000 - total_fee //TODO: BOLT 3 does not specify if we should add amount_msat before dividing or if we should divide by 1000 before subtracting (as we do here)
 468         });
 469
 470         Transaction {
 471                 version: 2,
 472                 lock_time: if htlc.offered { htlc.cltv_expiry } else { 0 },
 473                 input: txins,
 474                 output: txouts,
 475         }
 476 }
 477
 478 /// Signs a transaction created by build_htlc_transaction. If the transaction is an
 479 /// HTLC-Success transaction (ie htlc.offered is false), preimage must be set!
 480 pub(crate) fn sign_htlc_transaction<T: secp256k1::Signing>(tx: &mut Transaction, their_sig: &Signature, preimage: &Option<PaymentPreimage>, htlc: &HTLCOutputInCommitment, a_htlc_key: &PublicKey, b_htlc_key: &PublicKey, revocation_key: &PublicKey, per_commitment_point: &PublicKey, htlc_base_key: &SecretKey, secp_ctx: &Secp256k1<T>) -> Result<(Signature, Script), ()> {
 481         if tx.input.len() != 1 { return Err(()); }
 482         if tx.input[0].witness.len() != 0 { return Err(()); }
 483
 484         let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&htlc, a_htlc_key, b_htlc_key, revocation_key);
 485
 486         let our_htlc_key = derive_private_key(secp_ctx, per_commitment_point, htlc_base_key).map_err(|_| ())?;
 487         let sighash = hash_to_message!(&bip143::SighashComponents::new(&tx).sighash_all(&tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]);
 488         let local_tx = PublicKey::from_secret_key(&secp_ctx, &our_htlc_key) == *a_htlc_key;
 489         let our_sig = secp_ctx.sign(&sighash, &our_htlc_key);
 490
 491         tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
 492
 493         if local_tx { // b, then a
 494                 tx.input[0].witness.push(their_sig.serialize_der().to_vec());
 495                 tx.input[0].witness.push(our_sig.serialize_der().to_vec());
 496         } else {
 497                 tx.input[0].witness.push(our_sig.serialize_der().to_vec());
 498                 tx.input[0].witness.push(their_sig.serialize_der().to_vec());
 499         }
 500         tx.input[0].witness[1].push(SigHashType::All as u8);
 501         tx.input[0].witness[2].push(SigHashType::All as u8);
 502
 503         if htlc.offered {
 504                 tx.input[0].witness.push(Vec::new());
 505                 assert!(preimage.is_none());
 506         } else {
 507                 tx.input[0].witness.push(preimage.unwrap().0.to_vec());
 508         }
 509
 510         tx.input[0].witness.push(htlc_redeemscript.as_bytes().to_vec());
 511
 512         Ok((our_sig, htlc_redeemscript))
 513 }
 514
 515 #[derive(Clone)]
 516 /// We use this to track local commitment transactions and put off signing them until we are ready
 517 /// to broadcast. Eventually this will require a signer which is possibly external, but for now we
 518 /// just pass in the SecretKeys required.
 519 pub(crate) struct LocalCommitmentTransaction {
 520         tx: Transaction
 521 }
 522 impl LocalCommitmentTransaction {
 523         #[cfg(test)]
 524         pub fn dummy() -> Self {
 525                 Self { tx: Transaction {
 526                         version: 2,
 527                         input: Vec::new(),
 528                         output: Vec::new(),
 529                         lock_time: 0,
 530                 } }
 531         }
 532
 533         pub fn new_missing_local_sig(mut tx: Transaction, their_sig: &Signature, our_funding_key: &PublicKey, their_funding_key: &PublicKey) -> LocalCommitmentTransaction {
 534                 if tx.input.len() != 1 { panic!("Tried to store a commitment transaction that had input count != 1!"); }
 535                 if tx.input[0].witness.len() != 0 { panic!("Tried to store a signed commitment transaction?"); }
 536
 537                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
 538
 539                 if our_funding_key.serialize()[..] < their_funding_key.serialize()[..] {
 540                         tx.input[0].witness.push(Vec::new());
 541                         tx.input[0].witness.push(their_sig.serialize_der().to_vec());
 542                         tx.input[0].witness[2].push(SigHashType::All as u8);
 543                 } else {
 544                         tx.input[0].witness.push(their_sig.serialize_der().to_vec());
 545                         tx.input[0].witness[1].push(SigHashType::All as u8);
 546                         tx.input[0].witness.push(Vec::new());
 547                 }
 548
 549                 Self { tx }
 550         }
 551
 552         pub fn txid(&self) -> Sha256dHash {
 553                 self.tx.txid()
 554         }
 555
 556         pub fn has_local_sig(&self) -> bool {
 557                 if self.tx.input.len() != 1 { panic!("Commitment transactions must have input count == 1!"); }
 558                 if self.tx.input[0].witness.len() == 4 {
 559                         assert!(!self.tx.input[0].witness[1].is_empty());
 560                         assert!(!self.tx.input[0].witness[2].is_empty());
 561                         true
 562                 } else {
 563                         assert_eq!(self.tx.input[0].witness.len(), 3);
 564                         assert!(self.tx.input[0].witness[0].is_empty());
 565                         assert!(self.tx.input[0].witness[1].is_empty() || self.tx.input[0].witness[2].is_empty());
 566                         false
 567                 }
 568         }
 569
 570         pub fn add_local_sig<T: secp256k1::Signing>(&mut self, funding_key: &SecretKey, funding_redeemscript: &Script, channel_value_satoshis: u64, secp_ctx: &Secp256k1<T>) {
 571                 if self.has_local_sig() { return; }
 572                 let sighash = hash_to_message!(&bip143::SighashComponents::new(&self.tx)
 573                         .sighash_all(&self.tx.input[0], funding_redeemscript, channel_value_satoshis)[..]);
 574                 let our_sig = secp_ctx.sign(&sighash, funding_key);
 575
 576                 if self.tx.input[0].witness[1].is_empty() {
 577                         self.tx.input[0].witness[1] = our_sig.serialize_der().to_vec();
 578                         self.tx.input[0].witness[1].push(SigHashType::All as u8);
 579                 } else {
 580                         self.tx.input[0].witness[2] = our_sig.serialize_der().to_vec();
 581                         self.tx.input[0].witness[2].push(SigHashType::All as u8);
 582                 }
 583
 584                 self.tx.input[0].witness.push(funding_redeemscript.as_bytes().to_vec());
 585         }
 586
 587         pub fn without_valid_witness(&self) -> &Transaction { &self.tx }
 588         pub fn with_valid_witness(&self) -> &Transaction {
 589                 assert!(self.has_local_sig());
 590                 &self.tx
 591         }
 592 }
 593 impl PartialEq for LocalCommitmentTransaction {
 594         // We dont care whether we are signed in equality comparison
 595         fn eq(&self, o: &Self) -> bool {
 596                 self.txid() == o.txid()
 597         }
 598 }
 599 impl Writeable for LocalCommitmentTransaction {
 600         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
 601                 if let Err(e) = self.tx.consensus_encode(&mut WriterWriteAdaptor(writer)) {
 602                         match e {
 603                                 encode::Error::Io(e) => return Err(e),
 604                                 _ => panic!("local tx must have been well-formed!"),
 605                         }
 606                 }
 607                 Ok(())
 608         }
 609 }
 610 impl<R: ::std::io::Read> Readable<R> for LocalCommitmentTransaction {
 611         fn read(reader: &mut R) -> Result<Self, DecodeError> {
 612                 let tx = match Transaction::consensus_decode(reader.by_ref()) {
 613                         Ok(tx) => tx,
 614                         Err(e) => match e {
 615                                 encode::Error::Io(ioe) => return Err(DecodeError::Io(ioe)),
 616                                 _ => return Err(DecodeError::InvalidValue),
 617                         },
 618                 };
 619
 620                 if tx.input.len() != 1 {
 621                         // Ensure tx didn't hit the 0-input ambiguity case.
 622                         return Err(DecodeError::InvalidValue);
 623                 }
 624                 Ok(Self { tx })
 625         }
 626 }
 627
 628 #[cfg(test)]
 629 mod tests {
 630         use super::CounterpartyCommitmentSecrets;
 631         use hex;
 632
 633         #[test]
 634         fn test_per_commitment_storage() {
 635                 // Test vectors from BOLT 3:
 636                 let mut secrets: Vec<[u8; 32]> = Vec::new();
 637                 let mut monitor;
 638
 639                 macro_rules! test_secrets {
 640                         () => {
 641                                 let mut idx = 281474976710655;
 642                                 for secret in secrets.iter() {
 643                                         assert_eq!(monitor.get_secret(idx).unwrap(), *secret);
 644                                         idx -= 1;
 645                                 }
 646                                 assert_eq!(monitor.get_min_seen_secret(), idx + 1);
 647                                 assert!(monitor.get_secret(idx).is_none());
 648                         };
 649                 }
 650
 651                 {
 652                         // insert_secret correct sequence
 653                         monitor = CounterpartyCommitmentSecrets::new();
 654                         secrets.clear();
 655
 656                         secrets.push([0; 32]);
 657                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
 658                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 659                         test_secrets!();
 660
 661                         secrets.push([0; 32]);
 662                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 663                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 664                         test_secrets!();
 665
 666                         secrets.push([0; 32]);
 667                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
 668                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 669                         test_secrets!();
 670
 671                         secrets.push([0; 32]);
 672                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 673                         monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
 674                         test_secrets!();
 675
 676                         secrets.push([0; 32]);
 677                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
 678                         monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
 679                         test_secrets!();
 680
 681                         secrets.push([0; 32]);
 682                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
 683                         monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
 684                         test_secrets!();
 685
 686                         secrets.push([0; 32]);
 687                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
 688                         monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
 689                         test_secrets!();
 690
 691                         secrets.push([0; 32]);
 692                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
 693                         monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).unwrap();
 694                         test_secrets!();
 695                 }
 696
 697                 {
 698                         // insert_secret #1 incorrect
 699                         monitor = CounterpartyCommitmentSecrets::new();
 700                         secrets.clear();
 701
 702                         secrets.push([0; 32]);
 703                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
 704                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 705                         test_secrets!();
 706
 707                         secrets.push([0; 32]);
 708                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 709                         assert!(monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).is_err());
 710                 }
 711
 712                 {
 713                         // insert_secret #2 incorrect (#1 derived from incorrect)
 714                         monitor = CounterpartyCommitmentSecrets::new();
 715                         secrets.clear();
 716
 717                         secrets.push([0; 32]);
 718                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
 719                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 720                         test_secrets!();
 721
 722                         secrets.push([0; 32]);
 723                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
 724                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 725                         test_secrets!();
 726
 727                         secrets.push([0; 32]);
 728                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
 729                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 730                         test_secrets!();
 731
 732                         secrets.push([0; 32]);
 733                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 734                         assert!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).is_err());
 735                 }
 736
 737                 {
 738                         // insert_secret #3 incorrect
 739                         monitor = CounterpartyCommitmentSecrets::new();
 740                         secrets.clear();
 741
 742                         secrets.push([0; 32]);
 743                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
 744                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 745                         test_secrets!();
 746
 747                         secrets.push([0; 32]);
 748                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 749                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 750                         test_secrets!();
 751
 752                         secrets.push([0; 32]);
 753                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
 754                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 755                         test_secrets!();
 756
 757                         secrets.push([0; 32]);
 758                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 759                         assert!(monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).is_err());
 760                 }
 761
 762                 {
 763                         // insert_secret #4 incorrect (1,2,3 derived from incorrect)
 764                         monitor = CounterpartyCommitmentSecrets::new();
 765                         secrets.clear();
 766
 767                         secrets.push([0; 32]);
 768                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap());
 769                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 770                         test_secrets!();
 771
 772                         secrets.push([0; 32]);
 773                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("dddc3a8d14fddf2b68fa8c7fbad2748274937479dd0f8930d5ebb4ab6bd866a3").unwrap());
 774                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 775                         test_secrets!();
 776
 777                         secrets.push([0; 32]);
 778                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c51a18b13e8527e579ec56365482c62f180b7d5760b46e9477dae59e87ed423a").unwrap());
 779                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 780                         test_secrets!();
 781
 782                         secrets.push([0; 32]);
 783                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("ba65d7b0ef55a3ba300d4e87af29868f394f8f138d78a7011669c79b37b936f4").unwrap());
 784                         monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
 785                         test_secrets!();
 786
 787                         secrets.push([0; 32]);
 788                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
 789                         monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
 790                         test_secrets!();
 791
 792                         secrets.push([0; 32]);
 793                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
 794                         monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
 795                         test_secrets!();
 796
 797                         secrets.push([0; 32]);
 798                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
 799                         monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
 800                         test_secrets!();
 801
 802                         secrets.push([0; 32]);
 803                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
 804                         assert!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).is_err());
 805                 }
 806
 807                 {
 808                         // insert_secret #5 incorrect
 809                         monitor = CounterpartyCommitmentSecrets::new();
 810                         secrets.clear();
 811
 812                         secrets.push([0; 32]);
 813                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
 814                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 815                         test_secrets!();
 816
 817                         secrets.push([0; 32]);
 818                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 819                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 820                         test_secrets!();
 821
 822                         secrets.push([0; 32]);
 823                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
 824                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 825                         test_secrets!();
 826
 827                         secrets.push([0; 32]);
 828                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 829                         monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
 830                         test_secrets!();
 831
 832                         secrets.push([0; 32]);
 833                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
 834                         monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
 835                         test_secrets!();
 836
 837                         secrets.push([0; 32]);
 838                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
 839                         assert!(monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).is_err());
 840                 }
 841
 842                 {
 843                         // insert_secret #6 incorrect (5 derived from incorrect)
 844                         monitor = CounterpartyCommitmentSecrets::new();
 845                         secrets.clear();
 846
 847                         secrets.push([0; 32]);
 848                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
 849                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 850                         test_secrets!();
 851
 852                         secrets.push([0; 32]);
 853                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 854                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 855                         test_secrets!();
 856
 857                         secrets.push([0; 32]);
 858                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
 859                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 860                         test_secrets!();
 861
 862                         secrets.push([0; 32]);
 863                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 864                         monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
 865                         test_secrets!();
 866
 867                         secrets.push([0; 32]);
 868                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("631373ad5f9ef654bb3dade742d09504c567edd24320d2fcd68e3cc47e2ff6a6").unwrap());
 869                         monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
 870                         test_secrets!();
 871
 872                         secrets.push([0; 32]);
 873                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("b7e76a83668bde38b373970155c868a653304308f9896692f904a23731224bb1").unwrap());
 874                         monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
 875                         test_secrets!();
 876
 877                         secrets.push([0; 32]);
 878                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
 879                         monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
 880                         test_secrets!();
 881
 882                         secrets.push([0; 32]);
 883                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
 884                         assert!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).is_err());
 885                 }
 886
 887                 {
 888                         // insert_secret #7 incorrect
 889                         monitor = CounterpartyCommitmentSecrets::new();
 890                         secrets.clear();
 891
 892                         secrets.push([0; 32]);
 893                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
 894                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 895                         test_secrets!();
 896
 897                         secrets.push([0; 32]);
 898                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 899                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 900                         test_secrets!();
 901
 902                         secrets.push([0; 32]);
 903                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
 904                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 905                         test_secrets!();
 906
 907                         secrets.push([0; 32]);
 908                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 909                         monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
 910                         test_secrets!();
 911
 912                         secrets.push([0; 32]);
 913                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
 914                         monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
 915                         test_secrets!();
 916
 917                         secrets.push([0; 32]);
 918                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
 919                         monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
 920                         test_secrets!();
 921
 922                         secrets.push([0; 32]);
 923                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("e7971de736e01da8ed58b94c2fc216cb1dca9e326f3a96e7194fe8ea8af6c0a3").unwrap());
 924                         monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
 925                         test_secrets!();
 926
 927                         secrets.push([0; 32]);
 928                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("05cde6323d949933f7f7b78776bcc1ea6d9b31447732e3802e1f7ac44b650e17").unwrap());
 929                         assert!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).is_err());
 930                 }
 931
 932                 {
 933                         // insert_secret #8 incorrect
 934                         monitor = CounterpartyCommitmentSecrets::new();
 935                         secrets.clear();
 936
 937                         secrets.push([0; 32]);
 938                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap());
 939                         monitor.provide_secret(281474976710655, secrets.last().unwrap().clone()).unwrap();
 940                         test_secrets!();
 941
 942                         secrets.push([0; 32]);
 943                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c7518c8ae4660ed02894df8976fa1a3659c1a8b4b5bec0c4b872abeba4cb8964").unwrap());
 944                         monitor.provide_secret(281474976710654, secrets.last().unwrap().clone()).unwrap();
 945                         test_secrets!();
 946
 947                         secrets.push([0; 32]);
 948                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("2273e227a5b7449b6e70f1fb4652864038b1cbf9cd7c043a7d6456b7fc275ad8").unwrap());
 949                         monitor.provide_secret(281474976710653, secrets.last().unwrap().clone()).unwrap();
 950                         test_secrets!();
 951
 952                         secrets.push([0; 32]);
 953                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("27cddaa5624534cb6cb9d7da077cf2b22ab21e9b506fd4998a51d54502e99116").unwrap());
 954                         monitor.provide_secret(281474976710652, secrets.last().unwrap().clone()).unwrap();
 955                         test_secrets!();
 956
 957                         secrets.push([0; 32]);
 958                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("c65716add7aa98ba7acb236352d665cab17345fe45b55fb879ff80e6bd0c41dd").unwrap());
 959                         monitor.provide_secret(281474976710651, secrets.last().unwrap().clone()).unwrap();
 960                         test_secrets!();
 961
 962                         secrets.push([0; 32]);
 963                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("969660042a28f32d9be17344e09374b379962d03db1574df5a8a5a47e19ce3f2").unwrap());
 964                         monitor.provide_secret(281474976710650, secrets.last().unwrap().clone()).unwrap();
 965                         test_secrets!();
 966
 967                         secrets.push([0; 32]);
 968                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a5a64476122ca0925fb344bdc1854c1c0a59fc614298e50a33e331980a220f32").unwrap());
 969                         monitor.provide_secret(281474976710649, secrets.last().unwrap().clone()).unwrap();
 970                         test_secrets!();
 971
 972                         secrets.push([0; 32]);
 973                         secrets.last_mut().unwrap()[0..32].clone_from_slice(&hex::decode("a7efbc61aac46d34f77778bac22c8a20c6a46ca460addc49009bda875ec88fa4").unwrap());
 974                         assert!(monitor.provide_secret(281474976710648, secrets.last().unwrap().clone()).is_err());
 975                 }
 976         }
 977 }