use bitcoin::consensus::encode::{self, Decodable, Encodable};
use bitcoin::util::bip143;
-use bitcoin_hashes::{Hash, HashEngine};
-use bitcoin_hashes::sha256::Hash as Sha256;
-use bitcoin_hashes::ripemd160::Hash as Ripemd160;
-use bitcoin_hashes::hash160::Hash as Hash160;
-use bitcoin_hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hashes::{Hash, HashEngine};
+use bitcoin::hashes::sha256::Hash as Sha256;
+use bitcoin::hashes::ripemd160::Hash as Ripemd160;
+use bitcoin::hash_types::{Txid, PubkeyHash};
use ln::channelmanager::{PaymentHash, PaymentPreimage};
use ln::msgs::DecodeError;
use util::ser::{Readable, Writeable, Writer, WriterWriteAdaptor};
use util::byte_utils;
-use secp256k1::key::{SecretKey, PublicKey};
-use secp256k1::{Secp256k1, Signature};
-use secp256k1;
+use bitcoin::secp256k1::key::{SecretKey, PublicKey};
+use bitcoin::secp256k1::{Secp256k1, Signature};
+use bitcoin::secp256k1;
use std::{cmp, mem};
if htlc.offered {
Builder::new().push_opcode(opcodes::all::OP_DUP)
.push_opcode(opcodes::all::OP_HASH160)
- .push_slice(&Hash160::hash(&revocation_key.serialize())[..])
+ .push_slice(&PubkeyHash::hash(&revocation_key.serialize())[..])
.push_opcode(opcodes::all::OP_EQUAL)
.push_opcode(opcodes::all::OP_IF)
.push_opcode(opcodes::all::OP_CHECKSIG)
} else {
Builder::new().push_opcode(opcodes::all::OP_DUP)
.push_opcode(opcodes::all::OP_HASH160)
- .push_slice(&Hash160::hash(&revocation_key.serialize())[..])
+ .push_slice(&PubkeyHash::hash(&revocation_key.serialize())[..])
.push_opcode(opcodes::all::OP_EQUAL)
.push_opcode(opcodes::all::OP_IF)
.push_opcode(opcodes::all::OP_CHECKSIG)
}
/// panics if htlc.transaction_output_index.is_none()!
-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 {
+pub fn build_htlc_transaction(prev_hash: &Txid, feerate_per_kw: u64, to_self_delay: u16, htlc: &HTLCOutputInCommitment, a_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
let mut txins: Vec<TxIn> = Vec::new();
txins.push(TxIn {
previous_output: OutPoint {
/// to broadcast. Eventually this will require a signer which is possibly external, but for now we
/// just pass in the SecretKeys required.
pub struct LocalCommitmentTransaction {
- tx: Transaction,
- pub(crate) local_keys: TxCreationKeys,
- pub(crate) feerate_per_kw: u64,
- pub(crate) per_htlc: Vec<(HTLCOutputInCommitment, Option<Signature>)>,
+ // TODO: We should migrate away from providing the transaction, instead providing enough to
+ // allow the ChannelKeys to construct it from scratch. Luckily we already have HTLC data here,
+ // so we're probably most of the way there.
+ /// The commitment transaction itself, in unsigned form.
+ pub unsigned_tx: Transaction,
+ /// Our counterparty's signature for the transaction, above.
+ pub their_sig: Signature,
+ // Which order the signatures should go in when constructing the final commitment tx witness.
+ // The user should be able to reconstruc this themselves, so we don't bother to expose it.
+ our_sig_first: bool,
+ /// The key derivation parameters for this commitment transaction
+ pub local_keys: TxCreationKeys,
+ /// The feerate paid per 1000-weight-unit in this commitment transaction. This value is
+ /// controlled by the channel initiator.
+ pub feerate_per_kw: u64,
+ /// The HTLCs and remote htlc signatures which were included in this commitment transaction.
+ ///
+ /// Note that this includes all HTLCs, including ones which were considered dust and not
+ /// actually included in the transaction as it appears on-chain, but who's value is burned as
+ /// fees and not included in the to_local or to_remote outputs.
+ ///
+ /// The remote HTLC signatures in the second element will always be set for non-dust HTLCs, ie
+ /// those for which transaction_output_index.is_some().
+ pub per_htlc: Vec<(HTLCOutputInCommitment, Option<Signature>)>,
}
impl LocalCommitmentTransaction {
#[cfg(test)]
},
script_sig: Default::default(),
sequence: 0,
- witness: vec![vec![], vec![], vec![]]
+ witness: vec![]
};
let dummy_key = PublicKey::from_secret_key(&Secp256k1::new(), &SecretKey::from_slice(&[42; 32]).unwrap());
+ let dummy_sig = Secp256k1::new().sign(&secp256k1::Message::from_slice(&[42; 32]).unwrap(), &SecretKey::from_slice(&[42; 32]).unwrap());
Self {
- tx: Transaction {
+ unsigned_tx: Transaction {
version: 2,
input: vec![dummy_input],
output: Vec::new(),
lock_time: 0,
},
+ their_sig: dummy_sig,
+ our_sig_first: false,
local_keys: TxCreationKeys {
per_commitment_point: dummy_key.clone(),
revocation_key: dummy_key.clone(),
/// Generate a new LocalCommitmentTransaction based on a raw commitment transaction,
/// remote signature and both parties keys
- pub(crate) fn new_missing_local_sig(mut tx: Transaction, their_sig: &Signature, our_funding_key: &PublicKey, their_funding_key: &PublicKey, local_keys: TxCreationKeys, feerate_per_kw: u64, htlc_data: Vec<(HTLCOutputInCommitment, Option<Signature>)>) -> LocalCommitmentTransaction {
- if tx.input.len() != 1 { panic!("Tried to store a commitment transaction that had input count != 1!"); }
- if tx.input[0].witness.len() != 0 { panic!("Tried to store a signed commitment transaction?"); }
-
- tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
-
- if our_funding_key.serialize()[..] < their_funding_key.serialize()[..] {
- tx.input[0].witness.push(Vec::new());
- tx.input[0].witness.push(their_sig.serialize_der().to_vec());
- tx.input[0].witness[2].push(SigHashType::All as u8);
- } else {
- tx.input[0].witness.push(their_sig.serialize_der().to_vec());
- tx.input[0].witness[1].push(SigHashType::All as u8);
- tx.input[0].witness.push(Vec::new());
- }
+ pub(crate) fn new_missing_local_sig(unsigned_tx: Transaction, their_sig: Signature, our_funding_key: &PublicKey, their_funding_key: &PublicKey, local_keys: TxCreationKeys, feerate_per_kw: u64, htlc_data: Vec<(HTLCOutputInCommitment, Option<Signature>)>) -> LocalCommitmentTransaction {
+ if unsigned_tx.input.len() != 1 { panic!("Tried to store a commitment transaction that had input count != 1!"); }
+ if unsigned_tx.input[0].witness.len() != 0 { panic!("Tried to store a signed commitment transaction?"); }
- Self { tx,
+ Self {
+ unsigned_tx,
+ their_sig,
+ our_sig_first: our_funding_key.serialize()[..] < their_funding_key.serialize()[..],
local_keys,
feerate_per_kw,
per_htlc: htlc_data,
/// Get the txid of the local commitment transaction contained in this
/// LocalCommitmentTransaction
- pub fn txid(&self) -> Sha256dHash {
- self.tx.txid()
- }
-
- /// Check if LocalCommitmentTransaction has already been signed by us
- pub(crate) fn has_local_sig(&self) -> bool {
- if self.tx.input.len() != 1 { panic!("Commitment transactions must have input count == 1!"); }
- if self.tx.input[0].witness.len() == 4 {
- assert!(!self.tx.input[0].witness[1].is_empty());
- assert!(!self.tx.input[0].witness[2].is_empty());
- true
- } else {
- assert_eq!(self.tx.input[0].witness.len(), 3);
- assert!(self.tx.input[0].witness[0].is_empty());
- assert!(self.tx.input[0].witness[1].is_empty() || self.tx.input[0].witness[2].is_empty());
- false
- }
+ pub fn txid(&self) -> Txid {
+ self.unsigned_tx.txid()
}
/// Gets our signature for the contained commitment transaction given our funding private key.
/// ChannelKeys::sign_local_commitment() calls directly.
/// Channel value is amount locked in funding_outpoint.
pub fn get_local_sig<T: secp256k1::Signing>(&self, funding_key: &SecretKey, funding_redeemscript: &Script, channel_value_satoshis: u64, secp_ctx: &Secp256k1<T>) -> Signature {
- let sighash = hash_to_message!(&bip143::SighashComponents::new(&self.tx)
- .sighash_all(&self.tx.input[0], funding_redeemscript, channel_value_satoshis)[..]);
+ let sighash = hash_to_message!(&bip143::SighashComponents::new(&self.unsigned_tx)
+ .sighash_all(&self.unsigned_tx.input[0], funding_redeemscript, channel_value_satoshis)[..]);
secp_ctx.sign(&sighash, funding_key)
}
+ pub(crate) fn add_local_sig(&self, funding_redeemscript: &Script, our_sig: Signature) -> Transaction {
+ let mut tx = self.unsigned_tx.clone();
+ // First push the multisig dummy, note that due to BIP147 (NULLDUMMY) it must be a zero-length element.
+ tx.input[0].witness.push(Vec::new());
- pub(crate) fn add_local_sig(&mut self, funding_redeemscript: &Script, our_sig: Signature) {
- if self.has_local_sig() { return; }
-
- if self.tx.input[0].witness[1].is_empty() {
- self.tx.input[0].witness[1] = our_sig.serialize_der().to_vec();
- self.tx.input[0].witness[1].push(SigHashType::All as u8);
+ if self.our_sig_first {
+ tx.input[0].witness.push(our_sig.serialize_der().to_vec());
+ tx.input[0].witness.push(self.their_sig.serialize_der().to_vec());
} else {
- self.tx.input[0].witness[2] = our_sig.serialize_der().to_vec();
- self.tx.input[0].witness[2].push(SigHashType::All as u8);
+ tx.input[0].witness.push(self.their_sig.serialize_der().to_vec());
+ tx.input[0].witness.push(our_sig.serialize_der().to_vec());
}
+ tx.input[0].witness[1].push(SigHashType::All as u8);
+ tx.input[0].witness[2].push(SigHashType::All as u8);
- self.tx.input[0].witness.push(funding_redeemscript.as_bytes().to_vec());
- }
-
- /// Get raw transaction without asserting if witness is complete
- pub(crate) fn without_valid_witness(&self) -> &Transaction { &self.tx }
- /// Get raw transaction with panics if witness is incomplete
- pub(crate) fn with_valid_witness(&self) -> &Transaction {
- assert!(self.has_local_sig());
- &self.tx
+ tx.input[0].witness.push(funding_redeemscript.as_bytes().to_vec());
+ tx
}
/// Get a signature for each HTLC which was included in the commitment transaction (ie for
for this_htlc in self.per_htlc.iter() {
if this_htlc.0.transaction_output_index.is_some() {
let htlc_tx = build_htlc_transaction(&txid, self.feerate_per_kw, local_csv, &this_htlc.0, &self.local_keys.a_delayed_payment_key, &self.local_keys.revocation_key);
- assert_eq!(htlc_tx.input.len(), 1);
- assert_eq!(htlc_tx.input[0].witness.len(), 0);
let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&this_htlc.0, &self.local_keys.a_htlc_key, &self.local_keys.b_htlc_key, &self.local_keys.revocation_key);
// Channel should have checked that we have a remote signature for this HTLC at
// creation, and we should have a sensible htlc transaction:
assert!(this_htlc.1.is_some());
- assert_eq!(htlc_tx.input.len(), 1);
- assert_eq!(htlc_tx.input[0].witness.len(), 0);
let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&this_htlc.0, &self.local_keys.a_htlc_key, &self.local_keys.b_htlc_key, &self.local_keys.revocation_key);
}
impl Writeable for LocalCommitmentTransaction {
fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
- if let Err(e) = self.tx.consensus_encode(&mut WriterWriteAdaptor(writer)) {
+ if let Err(e) = self.unsigned_tx.consensus_encode(&mut WriterWriteAdaptor(writer)) {
match e {
encode::Error::Io(e) => return Err(e),
_ => panic!("local tx must have been well-formed!"),
}
}
+ self.their_sig.write(writer)?;
+ self.our_sig_first.write(writer)?;
self.local_keys.write(writer)?;
self.feerate_per_kw.write(writer)?;
writer.write_all(&byte_utils::be64_to_array(self.per_htlc.len() as u64))?;
}
impl Readable for LocalCommitmentTransaction {
fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
- let tx = match Transaction::consensus_decode(reader.by_ref()) {
+ let unsigned_tx = match Transaction::consensus_decode(reader.by_ref()) {
Ok(tx) => tx,
Err(e) => match e {
encode::Error::Io(ioe) => return Err(DecodeError::Io(ioe)),
_ => return Err(DecodeError::InvalidValue),
},
};
+ let their_sig = Readable::read(reader)?;
+ let our_sig_first = Readable::read(reader)?;
let local_keys = Readable::read(reader)?;
let feerate_per_kw = Readable::read(reader)?;
let htlcs_count: u64 = Readable::read(reader)?;
per_htlc.push((htlc, sigs));
}
- if tx.input.len() != 1 {
+ if unsigned_tx.input.len() != 1 {
// Ensure tx didn't hit the 0-input ambiguity case.
return Err(DecodeError::InvalidValue);
}
Ok(Self {
- tx,
+ unsigned_tx,
+ their_sig,
+ our_sig_first,
local_keys,
feerate_per_kw,
per_htlc,
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