From: Antoine Riard Date: Mon, 27 Apr 2020 23:22:10 +0000 (-0400) Subject: Duplicate RemoteTxCache in ChannelMonitor X-Git-Url: http://git.bitcoin.ninja/?a=commitdiff_plain;h=1401d4b0abac0b76e39f94e64611115d0544c31f;p=rust-lightning Duplicate RemoteTxCache in ChannelMonitor Dry-up remote pubkeys tracking in one struct. This introduce a duplicate of RemoteTxCache, which is going to be removed in next commit when OnchainTxHandler version is removed. --- diff --git a/lightning/src/chain/keysinterface.rs b/lightning/src/chain/keysinterface.rs index 366e78b57..8cfa2aa70 100644 --- a/lightning/src/chain/keysinterface.rs +++ b/lightning/src/chain/keysinterface.rs @@ -2,7 +2,7 @@ //! spendable on-chain outputs which the user owns and is responsible for using just as any other //! on-chain output which is theirs. -use bitcoin::blockdata::transaction::{Transaction, OutPoint, TxOut, SigHashType}; +use bitcoin::blockdata::transaction::{Transaction, OutPoint, TxOut}; use bitcoin::blockdata::script::{Script, Builder}; use bitcoin::blockdata::opcodes; use bitcoin::network::constants::Network; diff --git a/lightning/src/ln/channelmonitor.rs b/lightning/src/ln/channelmonitor.rs index fae8534dd..1cbea01b1 100644 --- a/lightning/src/ln/channelmonitor.rs +++ b/lightning/src/ln/channelmonitor.rs @@ -31,7 +31,7 @@ use ln::msgs::DecodeError; use ln::chan_utils; use ln::chan_utils::{CounterpartyCommitmentSecrets, HTLCOutputInCommitment, LocalCommitmentTransaction, HTLCType}; use ln::channelmanager::{HTLCSource, PaymentPreimage, PaymentHash}; -use ln::onchaintx::{OnchainTxHandler, InputDescriptors}; +use ln::onchaintx::{OnchainTxHandler, InputDescriptors, RemoteTxCache}; use chain::chaininterface::{ChainListener, ChainWatchInterface, BroadcasterInterface, FeeEstimator}; use chain::transaction::OutPoint; use chain::keysinterface::{SpendableOutputDescriptor, ChannelKeys}; @@ -425,15 +425,19 @@ struct LocalSignedTx { pub(crate) enum InputMaterial { Revoked { per_commitment_point: PublicKey, + remote_delayed_payment_base_key: PublicKey, + remote_htlc_base_key: PublicKey, per_commitment_key: SecretKey, input_descriptor: InputDescriptors, amount: u64, + htlc: Option }, RemoteHTLC { per_commitment_point: PublicKey, + remote_delayed_payment_base_key: PublicKey, + remote_htlc_base_key: PublicKey, preimage: Option, - amount: u64, - locktime: u32, + htlc: HTLCOutputInCommitment }, LocalHTLC { preimage: Option, @@ -447,19 +451,23 @@ pub(crate) enum InputMaterial { impl Writeable for InputMaterial { fn write(&self, writer: &mut W) -> Result<(), ::std::io::Error> { match self { - &InputMaterial::Revoked { ref per_commitment_point, ref per_commitment_key, ref input_descriptor, ref amount} => { + &InputMaterial::Revoked { ref per_commitment_point, ref remote_delayed_payment_base_key, ref remote_htlc_base_key, ref per_commitment_key, ref input_descriptor, ref amount, ref htlc} => { writer.write_all(&[0; 1])?; per_commitment_point.write(writer)?; + remote_delayed_payment_base_key.write(writer)?; + remote_htlc_base_key.write(writer)?; writer.write_all(&per_commitment_key[..])?; input_descriptor.write(writer)?; writer.write_all(&byte_utils::be64_to_array(*amount))?; + htlc.write(writer)?; }, - &InputMaterial::RemoteHTLC { ref per_commitment_point, ref preimage, ref amount, ref locktime } => { + &InputMaterial::RemoteHTLC { ref per_commitment_point, ref remote_delayed_payment_base_key, ref remote_htlc_base_key, ref preimage, ref htlc} => { writer.write_all(&[1; 1])?; per_commitment_point.write(writer)?; + remote_delayed_payment_base_key.write(writer)?; + remote_htlc_base_key.write(writer)?; preimage.write(writer)?; - writer.write_all(&byte_utils::be64_to_array(*amount))?; - writer.write_all(&byte_utils::be32_to_array(*locktime))?; + htlc.write(writer)?; }, &InputMaterial::LocalHTLC { ref preimage, ref amount } => { writer.write_all(&[2; 1])?; @@ -480,26 +488,34 @@ impl Readable for InputMaterial { let input_material = match ::read(reader)? { 0 => { let per_commitment_point = Readable::read(reader)?; + let remote_delayed_payment_base_key = Readable::read(reader)?; + let remote_htlc_base_key = Readable::read(reader)?; let per_commitment_key = Readable::read(reader)?; let input_descriptor = Readable::read(reader)?; let amount = Readable::read(reader)?; + let htlc = Readable::read(reader)?; InputMaterial::Revoked { per_commitment_point, + remote_delayed_payment_base_key, + remote_htlc_base_key, per_commitment_key, input_descriptor, - amount + amount, + htlc } }, 1 => { let per_commitment_point = Readable::read(reader)?; + let remote_delayed_payment_base_key = Readable::read(reader)?; + let remote_htlc_base_key = Readable::read(reader)?; let preimage = Readable::read(reader)?; - let amount = Readable::read(reader)?; - let locktime = Readable::read(reader)?; + let htlc = Readable::read(reader)?; InputMaterial::RemoteHTLC { per_commitment_point, + remote_delayed_payment_base_key, + remote_htlc_base_key, preimage, - amount, - locktime + htlc } }, 2 => { @@ -707,8 +723,7 @@ pub struct ChannelMonitor { current_remote_commitment_txid: Option, prev_remote_commitment_txid: Option, - their_htlc_base_key: PublicKey, - their_delayed_payment_base_key: PublicKey, + remote_tx_cache: RemoteTxCache, funding_redeemscript: Script, channel_value_satoshis: u64, // first is the idx of the first of the two revocation points @@ -800,8 +815,7 @@ impl PartialEq for ChannelMonitor { self.funding_info != other.funding_info || self.current_remote_commitment_txid != other.current_remote_commitment_txid || self.prev_remote_commitment_txid != other.prev_remote_commitment_txid || - self.their_htlc_base_key != other.their_htlc_base_key || - self.their_delayed_payment_base_key != other.their_delayed_payment_base_key || + self.remote_tx_cache != other.remote_tx_cache || self.funding_redeemscript != other.funding_redeemscript || self.channel_value_satoshis != other.channel_value_satoshis || self.their_cur_revocation_points != other.their_cur_revocation_points || @@ -869,8 +883,16 @@ impl ChannelMonitor { self.current_remote_commitment_txid.write(writer)?; self.prev_remote_commitment_txid.write(writer)?; - writer.write_all(&self.their_htlc_base_key.serialize())?; - writer.write_all(&self.their_delayed_payment_base_key.serialize())?; + self.remote_tx_cache.remote_delayed_payment_base_key.write(writer)?; + self.remote_tx_cache.remote_htlc_base_key.write(writer)?; + writer.write_all(&byte_utils::be64_to_array(self.remote_tx_cache.per_htlc.len() as u64))?; + for (ref txid, ref htlcs) in self.remote_tx_cache.per_htlc.iter() { + writer.write_all(&txid[..])?; + writer.write_all(&byte_utils::be64_to_array(htlcs.len() as u64))?; + for &ref htlc in htlcs.iter() { + htlc.write(writer)?; + } + } self.funding_redeemscript.write(writer)?; self.channel_value_satoshis.write(writer)?; @@ -1025,7 +1047,7 @@ impl ChannelMonitor { impl ChannelMonitor { pub(super) fn new(keys: ChanSigner, shutdown_pubkey: &PublicKey, our_to_self_delay: u16, destination_script: &Script, funding_info: (OutPoint, Script), - their_htlc_base_key: &PublicKey, their_delayed_payment_base_key: &PublicKey, + remote_htlc_base_key: &PublicKey, remote_delayed_payment_base_key: &PublicKey, their_to_self_delay: u16, funding_redeemscript: Script, channel_value_satoshis: u64, commitment_transaction_number_obscure_factor: u64, initial_local_commitment_tx: LocalCommitmentTransaction, @@ -1037,7 +1059,9 @@ impl ChannelMonitor { let payment_key_hash = WPubkeyHash::hash(&keys.pubkeys().payment_point.serialize()); let remote_payment_script = Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&payment_key_hash[..]).into_script(); - let mut onchain_tx_handler = OnchainTxHandler::new(destination_script.clone(), keys.clone(), their_to_self_delay, their_delayed_payment_base_key.clone(), their_htlc_base_key.clone(), our_to_self_delay, logger.clone()); + let remote_tx_cache = RemoteTxCache { remote_delayed_payment_base_key: *remote_delayed_payment_base_key, remote_htlc_base_key: *remote_htlc_base_key, per_htlc: HashMap::new() }; + + let mut onchain_tx_handler = OnchainTxHandler::new(destination_script.clone(), keys.clone(), their_to_self_delay, *remote_delayed_payment_base_key, *remote_htlc_base_key ,our_to_self_delay, logger.clone()); let local_tx_sequence = initial_local_commitment_tx.unsigned_tx.input[0].sequence as u64; let local_tx_locktime = initial_local_commitment_tx.unsigned_tx.lock_time as u64; @@ -1072,8 +1096,7 @@ impl ChannelMonitor { current_remote_commitment_txid: None, prev_remote_commitment_txid: None, - their_htlc_base_key: *their_htlc_base_key, - their_delayed_payment_base_key: *their_delayed_payment_base_key, + remote_tx_cache, funding_redeemscript, channel_value_satoshis: channel_value_satoshis, their_cur_revocation_points: None, @@ -1205,6 +1228,7 @@ impl ChannelMonitor { htlcs.push(htlc.0); } } + self.remote_tx_cache.per_htlc.insert(new_txid, htlcs.clone()); self.onchain_tx_handler.provide_latest_remote_tx(new_txid, htlcs); } @@ -1413,7 +1437,7 @@ impl ChannelMonitor { let per_commitment_key = ignore_error!(SecretKey::from_slice(&secret)); let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key); let revocation_pubkey = ignore_error!(chan_utils::derive_public_revocation_key(&self.secp_ctx, &per_commitment_point, &self.keys.pubkeys().revocation_basepoint)); - 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)); + let delayed_key = ignore_error!(chan_utils::derive_public_key(&self.secp_ctx, &PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key), &self.remote_tx_cache.remote_delayed_payment_base_key)); let revokeable_redeemscript = chan_utils::get_revokeable_redeemscript(&revocation_pubkey, self.our_to_self_delay, &delayed_key); let revokeable_p2wsh = revokeable_redeemscript.to_v0_p2wsh(); @@ -1421,7 +1445,7 @@ impl ChannelMonitor { // First, process non-htlc outputs (to_local & to_remote) for (idx, outp) in tx.output.iter().enumerate() { if outp.script_pubkey == revokeable_p2wsh { - let witness_data = InputMaterial::Revoked { per_commitment_point, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: outp.value }; + let witness_data = InputMaterial::Revoked { per_commitment_point, remote_delayed_payment_base_key: self.remote_tx_cache.remote_delayed_payment_base_key, remote_htlc_base_key: self.remote_tx_cache.remote_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: outp.value, htlc: None }; claimable_outpoints.push(ClaimRequest { absolute_timelock: height + self.our_to_self_delay as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: commitment_txid, vout: idx as u32 }, witness_data}); } } @@ -1434,7 +1458,7 @@ impl ChannelMonitor { tx.output[transaction_output_index as usize].value != htlc.amount_msat / 1000 { return (claimable_outpoints, (commitment_txid, watch_outputs)); // Corrupted per_commitment_data, fuck this user } - let witness_data = InputMaterial::Revoked { per_commitment_point, per_commitment_key, input_descriptor: if htlc.offered { InputDescriptors::RevokedOfferedHTLC } else { InputDescriptors::RevokedReceivedHTLC }, amount: tx.output[transaction_output_index as usize].value }; + let witness_data = InputMaterial::Revoked { per_commitment_point, remote_delayed_payment_base_key: self.remote_tx_cache.remote_delayed_payment_base_key, remote_htlc_base_key: self.remote_tx_cache.remote_htlc_base_key, per_commitment_key, input_descriptor: if htlc.offered { InputDescriptors::RevokedOfferedHTLC } else { InputDescriptors::RevokedReceivedHTLC }, amount: tx.output[transaction_output_index as usize].value, htlc: Some(htlc.clone()) }; claimable_outpoints.push(ClaimRequest { absolute_timelock: htlc.cltv_expiry, aggregable: true, outpoint: BitcoinOutPoint { txid: commitment_txid, vout: transaction_output_index }, witness_data }); } } @@ -1569,7 +1593,7 @@ impl ChannelMonitor { let preimage = if htlc.offered { if let Some(p) = self.payment_preimages.get(&htlc.payment_hash) { Some(*p) } else { None } } else { None }; let aggregable = if !htlc.offered { false } else { true }; if preimage.is_some() || !htlc.offered { - let witness_data = InputMaterial::RemoteHTLC { per_commitment_point: *revocation_point, preimage, amount: htlc.amount_msat / 1000, locktime: htlc.cltv_expiry }; + let witness_data = InputMaterial::RemoteHTLC { per_commitment_point: *revocation_point, remote_delayed_payment_base_key: self.remote_tx_cache.remote_delayed_payment_base_key, remote_htlc_base_key: self.remote_tx_cache.remote_htlc_base_key, preimage, htlc: htlc.clone() }; claimable_outpoints.push(ClaimRequest { absolute_timelock: htlc.cltv_expiry, aggregable, outpoint: BitcoinOutPoint { txid: commitment_txid, vout: transaction_output_index }, witness_data }); } } @@ -1601,7 +1625,7 @@ impl ChannelMonitor { let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &per_commitment_key); log_trace!(self, "Remote HTLC broadcast {}:{}", htlc_txid, 0); - let witness_data = InputMaterial::Revoked { per_commitment_point, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value }; + let witness_data = InputMaterial::Revoked { per_commitment_point, remote_delayed_payment_base_key: self.remote_tx_cache.remote_delayed_payment_base_key, remote_htlc_base_key: self.remote_tx_cache.remote_htlc_base_key, per_commitment_key, input_descriptor: InputDescriptors::RevokedOutput, amount: tx.output[0].value, htlc: None }; let claimable_outpoints = vec!(ClaimRequest { absolute_timelock: height + self.our_to_self_delay as u32, aggregable: true, outpoint: BitcoinOutPoint { txid: htlc_txid, vout: 0}, witness_data }); (claimable_outpoints, Some((htlc_txid, tx.output.clone()))) } @@ -2192,8 +2216,29 @@ impl ReadableArgs> for (BlockHas let current_remote_commitment_txid = Readable::read(reader)?; let prev_remote_commitment_txid = Readable::read(reader)?; - let their_htlc_base_key = Readable::read(reader)?; - let their_delayed_payment_base_key = Readable::read(reader)?; + let remote_tx_cache = { + let remote_delayed_payment_base_key = Readable::read(reader)?; + let remote_htlc_base_key = Readable::read(reader)?; + let per_htlc_len: u64 = Readable::read(reader)?; + let mut per_htlc = HashMap::with_capacity(cmp::min(per_htlc_len as usize, MAX_ALLOC_SIZE / 64)); + for _ in 0..per_htlc_len { + let txid: Txid = Readable::read(reader)?; + let htlcs_count: u64 = Readable::read(reader)?; + let mut htlcs = Vec::with_capacity(cmp::min(htlcs_count as usize, MAX_ALLOC_SIZE / 32)); + for _ in 0..htlcs_count { + let htlc = Readable::read(reader)?; + htlcs.push(htlc); + } + if let Some(_) = per_htlc.insert(txid, htlcs) { + return Err(DecodeError::InvalidValue); + } + } + RemoteTxCache { + remote_delayed_payment_base_key, + remote_htlc_base_key, + per_htlc, + } + }; let funding_redeemscript = Readable::read(reader)?; let channel_value_satoshis = Readable::read(reader)?; @@ -2402,8 +2447,7 @@ impl ReadableArgs> for (BlockHas current_remote_commitment_txid, prev_remote_commitment_txid, - their_htlc_base_key, - their_delayed_payment_base_key, + remote_tx_cache, funding_redeemscript, channel_value_satoshis, their_cur_revocation_points, diff --git a/lightning/src/ln/onchaintx.rs b/lightning/src/ln/onchaintx.rs index 6af53c73e..b5efaf938 100644 --- a/lightning/src/ln/onchaintx.rs +++ b/lightning/src/ln/onchaintx.rs @@ -51,10 +51,11 @@ enum OnchainEvent { /// Cache remote basepoint to compute any transaction on /// remote outputs, either justice or preimage/timeout transactions. -struct RemoteTxCache { - remote_delayed_payment_base_key: PublicKey, - remote_htlc_base_key: PublicKey, - per_htlc: HashMap> +#[derive(PartialEq)] +pub(super) struct RemoteTxCache { + pub(super) remote_delayed_payment_base_key: PublicKey, + pub(super) remote_htlc_base_key: PublicKey, + pub(super) per_htlc: HashMap> } /// Higher-level cache structure needed to re-generate bumped claim txn if needed @@ -599,9 +600,9 @@ impl OnchainTxHandler { inputs_witnesses_weight += Self::get_witnesses_weight(&[*input_descriptor]); amt += *amount; }, - &InputMaterial::RemoteHTLC { ref preimage, ref amount, .. } => { + &InputMaterial::RemoteHTLC { ref preimage, ref htlc, .. } => { inputs_witnesses_weight += Self::get_witnesses_weight(if preimage.is_some() { &[InputDescriptors::OfferedHTLC] } else { &[InputDescriptors::ReceivedHTLC] }); - amt += *amount; + amt += htlc.amount_msat / 1000; }, &InputMaterial::LocalHTLC { .. } => { dynamic_fee = false; @@ -634,33 +635,19 @@ impl OnchainTxHandler { for (i, (outp, per_outp_material)) in cached_claim_datas.per_input_material.iter().enumerate() { match per_outp_material { - &InputMaterial::Revoked { ref per_commitment_point, ref per_commitment_key, ref input_descriptor, ref amount } => { - if let Ok(chan_keys) = TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &self.remote_tx_cache.remote_delayed_payment_base_key, &self.remote_tx_cache.remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) { - - let mut this_htlc = None; - if *input_descriptor != InputDescriptors::RevokedOutput { - if let Some(htlcs) = self.remote_tx_cache.per_htlc.get(&outp.txid) { - for htlc in htlcs { - if htlc.transaction_output_index.unwrap() == outp.vout { - this_htlc = Some(htlc); - } - } - } - } + &InputMaterial::Revoked { ref per_commitment_point, ref remote_delayed_payment_base_key, ref remote_htlc_base_key, ref per_commitment_key, ref input_descriptor, ref amount, ref htlc } => { + if let Ok(chan_keys) = TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, remote_delayed_payment_base_key, remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) { - let witness_script = if *input_descriptor != InputDescriptors::RevokedOutput && this_htlc.is_some() { - chan_utils::get_htlc_redeemscript_with_explicit_keys(&this_htlc.unwrap(), &chan_keys.a_htlc_key, &chan_keys.b_htlc_key, &chan_keys.revocation_key) - } else if *input_descriptor != InputDescriptors::RevokedOutput { - return None; + let witness_script = if let Some(ref htlc) = *htlc { + chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &chan_keys.a_htlc_key, &chan_keys.b_htlc_key, &chan_keys.revocation_key) } else { chan_utils::get_revokeable_redeemscript(&chan_keys.revocation_key, self.remote_csv, &chan_keys.a_delayed_payment_key) }; - let is_htlc = *input_descriptor != InputDescriptors::RevokedOutput; - if let Ok(sig) = self.key_storage.sign_justice_transaction(&bumped_tx, i, &witness_script, *amount, &per_commitment_key, &chan_keys.revocation_key, is_htlc, &self.secp_ctx) { + if let Ok(sig) = self.key_storage.sign_justice_transaction(&bumped_tx, i, &witness_script, *amount, &per_commitment_key, &chan_keys.revocation_key, htlc.is_some(), &self.secp_ctx) { bumped_tx.input[i].witness.push(sig.serialize_der().to_vec()); bumped_tx.input[i].witness[0].push(SigHashType::All as u8); - if is_htlc { + if htlc.is_some() { bumped_tx.input[i].witness.push(chan_keys.revocation_key.clone().serialize().to_vec()); } else { bumped_tx.input[i].witness.push(vec!(1)); @@ -672,21 +659,12 @@ impl OnchainTxHandler { log_trace!(self, "Going to broadcast Penalty Transaction {} claiming revoked {} output {} from {} with new feerate {}...", bumped_tx.txid(), if *input_descriptor == InputDescriptors::RevokedOutput { "to_local" } else if *input_descriptor == InputDescriptors::RevokedOfferedHTLC { "offered" } else if *input_descriptor == InputDescriptors::RevokedReceivedHTLC { "received" } else { "" }, outp.vout, outp.txid, new_feerate); } }, - &InputMaterial::RemoteHTLC { ref per_commitment_point, ref preimage, ref amount, ref locktime } => { - if let Ok(chan_keys) = TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &self.remote_tx_cache.remote_delayed_payment_base_key, &self.remote_tx_cache.remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) { - let mut this_htlc = None; - if let Some(htlcs) = self.remote_tx_cache.per_htlc.get(&outp.txid) { - for htlc in htlcs { - if htlc.transaction_output_index.unwrap() == outp.vout { - this_htlc = Some(htlc); - } - } - } - if this_htlc.is_none() { return None; } - let witness_script = chan_utils::get_htlc_redeemscript_with_explicit_keys(&this_htlc.unwrap(), &chan_keys.a_htlc_key, &chan_keys.b_htlc_key, &chan_keys.revocation_key); + &InputMaterial::RemoteHTLC { ref per_commitment_point, ref remote_delayed_payment_base_key, ref remote_htlc_base_key, ref preimage, ref htlc } => { + if let Ok(chan_keys) = TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, remote_delayed_payment_base_key, remote_htlc_base_key, &self.key_storage.pubkeys().revocation_basepoint, &self.key_storage.pubkeys().htlc_basepoint) { + let witness_script = chan_utils::get_htlc_redeemscript_with_explicit_keys(&htlc, &chan_keys.a_htlc_key, &chan_keys.b_htlc_key, &chan_keys.revocation_key); - if !preimage.is_some() { bumped_tx.lock_time = *locktime }; // Right now we don't aggregate time-locked transaction, if we do we should set lock_time before to avoid breaking hash computation - if let Ok(sig) = self.key_storage.sign_remote_htlc_transaction(&bumped_tx, i, &witness_script, *amount, &per_commitment_point, preimage, &self.secp_ctx) { + if !preimage.is_some() { bumped_tx.lock_time = htlc.cltv_expiry }; // Right now we don't aggregate time-locked transaction, if we do we should set lock_time before to avoid breaking hash computation + if let Ok(sig) = self.key_storage.sign_remote_htlc_transaction(&bumped_tx, i, &witness_script, htlc.amount_msat / 1000, &per_commitment_point, preimage, &self.secp_ctx) { bumped_tx.input[i].witness.push(sig.serialize_der().to_vec()); bumped_tx.input[i].witness[0].push(SigHashType::All as u8); if let &Some(preimage) = preimage {