use ln::{PaymentHash, PaymentPreimage};
use ln::msgs::DecodeError;
use util::ser::{Readable, Writeable, Writer};
-use util::byte_utils;
+use util::{byte_utils, transaction_utils};
use bitcoin::hash_types::WPubkeyHash;
use bitcoin::secp256k1::key::{SecretKey, PublicKey};
use core::cmp;
use ln::chan_utils;
use util::transaction_utils::sort_outputs;
-use ln::channel::INITIAL_COMMITMENT_NUMBER;
+use ln::channel::{INITIAL_COMMITMENT_NUMBER, ANCHOR_OUTPUT_VALUE_SATOSHI};
use core::ops::Deref;
use chain;
pub(crate) const MAX_HTLCS: u16 = 483;
-pub(super) const HTLC_SUCCESS_TX_WEIGHT: u64 = 703;
-pub(super) const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663;
+/// Gets the weight for an HTLC-Success transaction.
+#[inline]
+pub fn htlc_success_tx_weight(opt_anchors: bool) -> u64 {
+ const HTLC_SUCCESS_TX_WEIGHT: u64 = 703;
+ const HTLC_SUCCESS_ANCHOR_TX_WEIGHT: u64 = 706;
+ if opt_anchors { HTLC_SUCCESS_ANCHOR_TX_WEIGHT } else { HTLC_SUCCESS_TX_WEIGHT }
+}
+
+/// Gets the weight for an HTLC-Timeout transaction.
+#[inline]
+pub fn htlc_timeout_tx_weight(opt_anchors: bool) -> u64 {
+ const HTLC_TIMEOUT_TX_WEIGHT: u64 = 663;
+ const HTLC_TIMEOUT_ANCHOR_TX_WEIGHT: u64 = 666;
+ if opt_anchors { HTLC_TIMEOUT_ANCHOR_TX_WEIGHT } else { HTLC_TIMEOUT_TX_WEIGHT }
+}
#[derive(PartialEq)]
pub(crate) enum HTLCType {
res
}
+/// Build a closing transaction
+pub fn build_closing_transaction(to_holder_value_sat: u64, to_counterparty_value_sat: u64, to_holder_script: Script, to_counterparty_script: Script, funding_outpoint: OutPoint) -> Transaction {
+ let txins = {
+ let mut ins: Vec<TxIn> = Vec::new();
+ ins.push(TxIn {
+ previous_output: funding_outpoint,
+ script_sig: Script::new(),
+ sequence: 0xffffffff,
+ witness: Vec::new(),
+ });
+ ins
+ };
+
+ let mut txouts: Vec<(TxOut, ())> = Vec::new();
+
+ if to_counterparty_value_sat > 0 {
+ txouts.push((TxOut {
+ script_pubkey: to_counterparty_script,
+ value: to_counterparty_value_sat
+ }, ()));
+ }
+
+ if to_holder_value_sat > 0 {
+ txouts.push((TxOut {
+ script_pubkey: to_holder_script,
+ value: to_holder_value_sat
+ }, ()));
+ }
+
+ transaction_utils::sort_outputs(&mut txouts, |_, _| { cmp::Ordering::Equal }); // Ordering doesnt matter if they used our pubkey...
+
+ let mut outputs: Vec<TxOut> = Vec::new();
+ for out in txouts.drain(..) {
+ outputs.push(out.0);
+ }
+
+ Transaction {
+ version: 2,
+ lock_time: 0,
+ input: txins,
+ output: outputs,
+ }
+}
+
/// Implements the per-commitment secret storage scheme from
/// [BOLT 3](https://github.com/lightningnetwork/lightning-rfc/blob/dcbf8583976df087c79c3ce0b535311212e6812d/03-transactions.md#efficient-per-commitment-secret-storage).
///
});
#[inline]
-pub(crate) fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, broadcaster_htlc_key: &PublicKey, countersignatory_htlc_key: &PublicKey, revocation_key: &PublicKey) -> Script {
+pub(crate) fn get_htlc_redeemscript_with_explicit_keys(htlc: &HTLCOutputInCommitment, opt_anchors: bool, broadcaster_htlc_key: &PublicKey, countersignatory_htlc_key: &PublicKey, revocation_key: &PublicKey) -> Script {
let payment_hash160 = Ripemd160::hash(&htlc.payment_hash.0[..]).into_inner();
if htlc.offered {
- Builder::new().push_opcode(opcodes::all::OP_DUP)
+ let mut bldr = Builder::new().push_opcode(opcodes::all::OP_DUP)
.push_opcode(opcodes::all::OP_HASH160)
.push_slice(&PubkeyHash::hash(&revocation_key.serialize())[..])
.push_opcode(opcodes::all::OP_EQUAL)
.push_slice(&payment_hash160)
.push_opcode(opcodes::all::OP_EQUALVERIFY)
.push_opcode(opcodes::all::OP_CHECKSIG)
- .push_opcode(opcodes::all::OP_ENDIF)
- .push_opcode(opcodes::all::OP_ENDIF)
- .into_script()
+ .push_opcode(opcodes::all::OP_ENDIF);
+ if opt_anchors {
+ bldr = bldr.push_opcode(opcodes::all::OP_PUSHNUM_1)
+ .push_opcode(opcodes::all::OP_CSV)
+ .push_opcode(opcodes::all::OP_DROP);
+ }
+ bldr.push_opcode(opcodes::all::OP_ENDIF)
+ .into_script()
} else {
- Builder::new().push_opcode(opcodes::all::OP_DUP)
+ let mut bldr = Builder::new().push_opcode(opcodes::all::OP_DUP)
.push_opcode(opcodes::all::OP_HASH160)
.push_slice(&PubkeyHash::hash(&revocation_key.serialize())[..])
.push_opcode(opcodes::all::OP_EQUAL)
.push_opcode(opcodes::all::OP_CLTV)
.push_opcode(opcodes::all::OP_DROP)
.push_opcode(opcodes::all::OP_CHECKSIG)
- .push_opcode(opcodes::all::OP_ENDIF)
- .push_opcode(opcodes::all::OP_ENDIF)
- .into_script()
+ .push_opcode(opcodes::all::OP_ENDIF);
+ if opt_anchors {
+ bldr = bldr.push_opcode(opcodes::all::OP_PUSHNUM_1)
+ .push_opcode(opcodes::all::OP_CSV)
+ .push_opcode(opcodes::all::OP_DROP);
+ }
+ bldr.push_opcode(opcodes::all::OP_ENDIF)
+ .into_script()
}
}
/// Gets the witness redeemscript for an HTLC output in a commitment transaction. Note that htlc
/// does not need to have its previous_output_index filled.
#[inline]
-pub fn get_htlc_redeemscript(htlc: &HTLCOutputInCommitment, keys: &TxCreationKeys) -> Script {
- get_htlc_redeemscript_with_explicit_keys(htlc, &keys.broadcaster_htlc_key, &keys.countersignatory_htlc_key, &keys.revocation_key)
+pub fn get_htlc_redeemscript(htlc: &HTLCOutputInCommitment, opt_anchors: bool, keys: &TxCreationKeys) -> Script {
+ get_htlc_redeemscript_with_explicit_keys(htlc, opt_anchors, &keys.broadcaster_htlc_key, &keys.countersignatory_htlc_key, &keys.revocation_key)
}
/// Gets the redeemscript for a funding output from the two funding public keys.
///
/// Panics if htlc.transaction_output_index.is_none() (as such HTLCs do not appear in the
/// commitment transaction).
-pub fn build_htlc_transaction(commitment_txid: &Txid, feerate_per_kw: u32, contest_delay: u16, htlc: &HTLCOutputInCommitment, broadcaster_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
+pub fn build_htlc_transaction(commitment_txid: &Txid, feerate_per_kw: u32, contest_delay: u16, htlc: &HTLCOutputInCommitment, opt_anchors: bool, broadcaster_delayed_payment_key: &PublicKey, revocation_key: &PublicKey) -> Transaction {
let mut txins: Vec<TxIn> = Vec::new();
txins.push(TxIn {
previous_output: OutPoint {
vout: htlc.transaction_output_index.expect("Can't build an HTLC transaction for a dust output"),
},
script_sig: Script::new(),
- sequence: 0,
+ sequence: if opt_anchors { 1 } else { 0 },
witness: Vec::new(),
});
- let total_fee = if htlc.offered {
- feerate_per_kw as u64 * HTLC_TIMEOUT_TX_WEIGHT / 1000
- } else {
- feerate_per_kw as u64 * HTLC_SUCCESS_TX_WEIGHT / 1000
- };
+ let weight = if htlc.offered {
+ htlc_timeout_tx_weight(opt_anchors)
+ } else {
+ htlc_success_tx_weight(opt_anchors)
+ };
+ let total_fee = feerate_per_kw as u64 * weight / 1000;
let mut txouts: Vec<TxOut> = Vec::new();
txouts.push(TxOut {
}
}
+/// Gets the witnessScript for the to_remote output when anchors are enabled.
+#[inline]
+pub(crate) fn get_to_countersignatory_with_anchors_redeemscript(payment_point: &PublicKey) -> Script {
+ Builder::new()
+ .push_slice(&payment_point.serialize()[..])
+ .push_opcode(opcodes::all::OP_CHECKSIGVERIFY)
+ .push_int(1)
+ .push_opcode(opcodes::all::OP_CSV)
+ .into_script()
+}
+
+/// Gets the witnessScript for an anchor output from the funding public key.
+/// The witness in the spending input must be:
+/// <BIP 143 funding_signature>
+/// After 16 blocks of confirmation, an alternative satisfying witness could be:
+/// <>
+/// (empty vector required to satisfy compliance with MINIMALIF-standard rule)
+#[inline]
+pub fn get_anchor_redeemscript(funding_pubkey: &PublicKey) -> Script {
+ Builder::new().push_slice(&funding_pubkey.serialize()[..])
+ .push_opcode(opcodes::all::OP_CHECKSIG)
+ .push_opcode(opcodes::all::OP_IFDUP)
+ .push_opcode(opcodes::all::OP_NOTIF)
+ .push_int(16)
+ .push_opcode(opcodes::all::OP_CSV)
+ .push_opcode(opcodes::all::OP_ENDIF)
+ .into_script()
+}
+
/// Per-channel data used to build transactions in conjunction with the per-commitment data (CommitmentTransaction).
/// The fields are organized by holder/counterparty.
///
pub counterparty_parameters: Option<CounterpartyChannelTransactionParameters>,
/// The late-bound funding outpoint
pub funding_outpoint: Option<chain::transaction::OutPoint>,
+ /// Are anchors used for this channel. Boolean is serialization backwards-compatible
+ pub opt_anchors: Option<()>
}
/// Late-bound per-channel counterparty data used to build transactions.
(4, is_outbound_from_holder, required),
(6, counterparty_parameters, option),
(8, funding_outpoint, option),
+ (10, opt_anchors, option),
});
/// Static channel fields used to build transactions given per-commitment fields, organized by
pub fn funding_outpoint(&self) -> OutPoint {
self.inner.funding_outpoint.unwrap().into_bitcoin_outpoint()
}
+
+ /// Whether to use anchors for this channel
+ pub fn opt_anchors(&self) -> bool {
+ self.inner.opt_anchors.is_some()
+ }
}
/// Information needed to build and sign a holder's commitment transaction.
holder_selected_contest_delay: 0,
is_outbound_from_holder: false,
counterparty_parameters: Some(CounterpartyChannelTransactionParameters { pubkeys: channel_pubkeys.clone(), selected_contest_delay: 0 }),
- funding_outpoint: Some(chain::transaction::OutPoint { txid: Default::default(), index: 0 })
+ funding_outpoint: Some(chain::transaction::OutPoint { txid: Default::default(), index: 0 }),
+ opt_anchors: None
};
let mut htlcs_with_aux: Vec<(_, ())> = Vec::new();
- let inner = CommitmentTransaction::new_with_auxiliary_htlc_data(0, 0, 0, keys, 0, &mut htlcs_with_aux, &channel_parameters.as_counterparty_broadcastable());
+ let inner = CommitmentTransaction::new_with_auxiliary_htlc_data(0, 0, 0, false, dummy_key.clone(), dummy_key.clone(), keys, 0, &mut htlcs_with_aux, &channel_parameters.as_counterparty_broadcastable());
HolderCommitmentTransaction {
inner,
counterparty_sig: dummy_sig,
}
}
-/// This class tracks the per-transaction information needed to build a commitment transaction and to
+/// This class tracks the per-transaction information needed to build a closing transaction and will
+/// actually build it and sign.
+///
+/// This class can be used inside a signer implementation to generate a signature given the relevant
+/// secret key.
+#[derive(Clone, Hash, PartialEq)]
+pub struct ClosingTransaction {
+ to_holder_value_sat: u64,
+ to_counterparty_value_sat: u64,
+ to_holder_script: Script,
+ to_counterparty_script: Script,
+ built: Transaction,
+}
+
+impl ClosingTransaction {
+ /// Construct an object of the class
+ pub fn new(
+ to_holder_value_sat: u64,
+ to_counterparty_value_sat: u64,
+ to_holder_script: Script,
+ to_counterparty_script: Script,
+ funding_outpoint: OutPoint,
+ ) -> Self {
+ let built = build_closing_transaction(
+ to_holder_value_sat, to_counterparty_value_sat,
+ to_holder_script.clone(), to_counterparty_script.clone(),
+ funding_outpoint
+ );
+ ClosingTransaction {
+ to_holder_value_sat,
+ to_counterparty_value_sat,
+ to_holder_script,
+ to_counterparty_script,
+ built
+ }
+ }
+
+ /// Trust our pre-built transaction.
+ ///
+ /// Applies a wrapper which allows access to the transaction.
+ ///
+ /// This should only be used if you fully trust the builder of this object. It should not
+ /// be used by an external signer - instead use the verify function.
+ pub fn trust(&self) -> TrustedClosingTransaction {
+ TrustedClosingTransaction { inner: self }
+ }
+
+ /// Verify our pre-built transaction.
+ ///
+ /// Applies a wrapper which allows access to the transaction.
+ ///
+ /// An external validating signer must call this method before signing
+ /// or using the built transaction.
+ pub fn verify(&self, funding_outpoint: OutPoint) -> Result<TrustedClosingTransaction, ()> {
+ let built = build_closing_transaction(
+ self.to_holder_value_sat, self.to_counterparty_value_sat,
+ self.to_holder_script.clone(), self.to_counterparty_script.clone(),
+ funding_outpoint
+ );
+ if self.built != built {
+ return Err(())
+ }
+ Ok(TrustedClosingTransaction { inner: self })
+ }
+
+ /// The value to be sent to the holder, or zero if the output will be omitted
+ pub fn to_holder_value_sat(&self) -> u64 {
+ self.to_holder_value_sat
+ }
+
+ /// The value to be sent to the counterparty, or zero if the output will be omitted
+ pub fn to_counterparty_value_sat(&self) -> u64 {
+ self.to_counterparty_value_sat
+ }
+
+ /// The destination of the holder's output
+ pub fn to_holder_script(&self) -> &Script {
+ &self.to_holder_script
+ }
+
+ /// The destination of the counterparty's output
+ pub fn to_counterparty_script(&self) -> &Script {
+ &self.to_counterparty_script
+ }
+}
+
+/// A wrapper on ClosingTransaction indicating that the built bitcoin
+/// transaction is trusted.
+///
+/// See trust() and verify() functions on CommitmentTransaction.
+///
+/// This structure implements Deref.
+pub struct TrustedClosingTransaction<'a> {
+ inner: &'a ClosingTransaction,
+}
+
+impl<'a> Deref for TrustedClosingTransaction<'a> {
+ type Target = ClosingTransaction;
+
+ fn deref(&self) -> &Self::Target { self.inner }
+}
+
+impl<'a> TrustedClosingTransaction<'a> {
+ /// The pre-built Bitcoin commitment transaction
+ pub fn built_transaction(&self) -> &Transaction {
+ &self.inner.built
+ }
+
+ /// Get the SIGHASH_ALL sighash value of the transaction.
+ ///
+ /// This can be used to verify a signature.
+ pub fn get_sighash_all(&self, funding_redeemscript: &Script, channel_value_satoshis: u64) -> Message {
+ let sighash = &bip143::SigHashCache::new(&self.inner.built).signature_hash(0, funding_redeemscript, channel_value_satoshis, SigHashType::All)[..];
+ hash_to_message!(sighash)
+ }
+
+ /// Sign a transaction, either because we are counter-signing the counterparty's transaction or
+ /// because we are about to broadcast a holder transaction.
+ pub fn sign<T: secp256k1::Signing>(&self, funding_key: &SecretKey, funding_redeemscript: &Script, channel_value_satoshis: u64, secp_ctx: &Secp256k1<T>) -> Signature {
+ let sighash = self.get_sighash_all(funding_redeemscript, channel_value_satoshis);
+ secp_ctx.sign(&sighash, funding_key)
+ }
+}
+
+/// This class tracks the per-transaction information needed to build a commitment transaction and will
/// actually build it and sign. It is used for holder transactions that we sign only when needed
/// and for transactions we sign for the counterparty.
///
to_countersignatory_value_sat: u64,
feerate_per_kw: u32,
htlcs: Vec<HTLCOutputInCommitment>,
+ // A boolean that is serialization backwards-compatible
+ opt_anchors: Option<()>,
// A cache of the parties' pubkeys required to construct the transaction, see doc for trust()
keys: TxCreationKeys,
// For access to the pre-built transaction, see doc for trust()
self.to_countersignatory_value_sat == o.to_countersignatory_value_sat &&
self.feerate_per_kw == o.feerate_per_kw &&
self.htlcs == o.htlcs &&
+ self.opt_anchors == o.opt_anchors &&
self.keys == o.keys;
if eq {
debug_assert_eq!(self.built.transaction, o.built.transaction);
(8, keys, required),
(10, built, required),
(12, htlcs, vec_type),
+ (14, opt_anchors, option),
});
impl CommitmentTransaction {
/// Only include HTLCs that are above the dust limit for the channel.
///
/// (C-not exported) due to the generic though we likely should expose a version without
- pub fn new_with_auxiliary_htlc_data<T>(commitment_number: u64, to_broadcaster_value_sat: u64, to_countersignatory_value_sat: u64, keys: TxCreationKeys, feerate_per_kw: u32, htlcs_with_aux: &mut Vec<(HTLCOutputInCommitment, T)>, channel_parameters: &DirectedChannelTransactionParameters) -> CommitmentTransaction {
+ pub fn new_with_auxiliary_htlc_data<T>(commitment_number: u64, to_broadcaster_value_sat: u64, to_countersignatory_value_sat: u64, opt_anchors: bool, broadcaster_funding_key: PublicKey, countersignatory_funding_key: PublicKey, keys: TxCreationKeys, feerate_per_kw: u32, htlcs_with_aux: &mut Vec<(HTLCOutputInCommitment, T)>, channel_parameters: &DirectedChannelTransactionParameters) -> CommitmentTransaction {
// Sort outputs and populate output indices while keeping track of the auxiliary data
- let (outputs, htlcs) = Self::internal_build_outputs(&keys, to_broadcaster_value_sat, to_countersignatory_value_sat, htlcs_with_aux, channel_parameters).unwrap();
+ let (outputs, htlcs) = Self::internal_build_outputs(&keys, to_broadcaster_value_sat, to_countersignatory_value_sat, htlcs_with_aux, channel_parameters, opt_anchors, &broadcaster_funding_key, &countersignatory_funding_key).unwrap();
let (obscured_commitment_transaction_number, txins) = Self::internal_build_inputs(commitment_number, channel_parameters);
let transaction = Self::make_transaction(obscured_commitment_transaction_number, txins, outputs);
to_countersignatory_value_sat,
feerate_per_kw,
htlcs,
+ opt_anchors: if opt_anchors { Some(()) } else { None },
keys,
built: BuiltCommitmentTransaction {
transaction,
}
}
- fn internal_rebuild_transaction(&self, keys: &TxCreationKeys, channel_parameters: &DirectedChannelTransactionParameters) -> Result<BuiltCommitmentTransaction, ()> {
+ fn internal_rebuild_transaction(&self, keys: &TxCreationKeys, channel_parameters: &DirectedChannelTransactionParameters, broadcaster_funding_key: &PublicKey, countersignatory_funding_key: &PublicKey) -> Result<BuiltCommitmentTransaction, ()> {
let (obscured_commitment_transaction_number, txins) = Self::internal_build_inputs(self.commitment_number, channel_parameters);
let mut htlcs_with_aux = self.htlcs.iter().map(|h| (h.clone(), ())).collect();
- let (outputs, _) = Self::internal_build_outputs(keys, self.to_broadcaster_value_sat, self.to_countersignatory_value_sat, &mut htlcs_with_aux, channel_parameters)?;
+ let (outputs, _) = Self::internal_build_outputs(keys, self.to_broadcaster_value_sat, self.to_countersignatory_value_sat, &mut htlcs_with_aux, channel_parameters, self.opt_anchors.is_some(), broadcaster_funding_key, countersignatory_funding_key)?;
let transaction = Self::make_transaction(obscured_commitment_transaction_number, txins, outputs);
let txid = transaction.txid();
// - initial sorting of outputs / HTLCs in the constructor, in which case T is auxiliary data the
// caller needs to have sorted together with the HTLCs so it can keep track of the output index
// - building of a bitcoin transaction during a verify() call, in which case T is just ()
- fn internal_build_outputs<T>(keys: &TxCreationKeys, to_broadcaster_value_sat: u64, to_countersignatory_value_sat: u64, htlcs_with_aux: &mut Vec<(HTLCOutputInCommitment, T)>, channel_parameters: &DirectedChannelTransactionParameters) -> Result<(Vec<TxOut>, Vec<HTLCOutputInCommitment>), ()> {
+ fn internal_build_outputs<T>(keys: &TxCreationKeys, to_broadcaster_value_sat: u64, to_countersignatory_value_sat: u64, htlcs_with_aux: &mut Vec<(HTLCOutputInCommitment, T)>, channel_parameters: &DirectedChannelTransactionParameters, opt_anchors: bool, broadcaster_funding_key: &PublicKey, countersignatory_funding_key: &PublicKey) -> Result<(Vec<TxOut>, Vec<HTLCOutputInCommitment>), ()> {
let countersignatory_pubkeys = channel_parameters.countersignatory_pubkeys();
let contest_delay = channel_parameters.contest_delay();
let mut txouts: Vec<(TxOut, Option<&mut HTLCOutputInCommitment>)> = Vec::new();
if to_countersignatory_value_sat > 0 {
- let script = script_for_p2wpkh(&countersignatory_pubkeys.payment_point);
+ let script = if opt_anchors {
+ get_to_countersignatory_with_anchors_redeemscript(&countersignatory_pubkeys.payment_point).to_v0_p2wsh()
+ } else {
+ get_p2wpkh_redeemscript(&countersignatory_pubkeys.payment_point)
+ };
txouts.push((
TxOut {
script_pubkey: script.clone(),
));
}
+ if opt_anchors {
+ if to_broadcaster_value_sat > 0 || !htlcs_with_aux.is_empty() {
+ let anchor_script = get_anchor_redeemscript(broadcaster_funding_key);
+ txouts.push((
+ TxOut {
+ script_pubkey: anchor_script.to_v0_p2wsh(),
+ value: ANCHOR_OUTPUT_VALUE_SATOSHI,
+ },
+ None,
+ ));
+ }
+
+ if to_countersignatory_value_sat > 0 || !htlcs_with_aux.is_empty() {
+ let anchor_script = get_anchor_redeemscript(countersignatory_funding_key);
+ txouts.push((
+ TxOut {
+ script_pubkey: anchor_script.to_v0_p2wsh(),
+ value: ANCHOR_OUTPUT_VALUE_SATOSHI,
+ },
+ None,
+ ));
+ }
+ }
+
let mut htlcs = Vec::with_capacity(htlcs_with_aux.len());
for (htlc, _) in htlcs_with_aux {
- let script = chan_utils::get_htlc_redeemscript(&htlc, &keys);
+ let script = chan_utils::get_htlc_redeemscript(&htlc, opt_anchors, &keys);
let txout = TxOut {
script_pubkey: script.to_v0_p2wsh(),
value: htlc.amount_msat / 1000,
/// Applies a wrapper which allows access to these fields.
///
/// This should only be used if you fully trust the builder of this object. It should not
- /// be used by an external signer - instead use the verify function.
+ /// be used by an external signer - instead use the verify function.
pub fn trust(&self) -> TrustedCommitmentTransaction {
TrustedCommitmentTransaction { inner: self }
}
if keys != self.keys {
return Err(());
}
- let tx = self.internal_rebuild_transaction(&keys, channel_parameters)?;
+ let tx = self.internal_rebuild_transaction(&keys, channel_parameters, &broadcaster_keys.funding_pubkey, &countersignatory_keys.funding_pubkey)?;
if self.built.transaction != tx.transaction || self.built.txid != tx.txid {
return Err(());
}
&self.inner.keys
}
+ /// Should anchors be used.
+ pub fn opt_anchors(&self) -> bool {
+ self.opt_anchors.is_some()
+ }
+
/// Get a signature for each HTLC which was included in the commitment transaction (ie for
/// which HTLCOutputInCommitment::transaction_output_index.is_some()).
///
/// The returned Vec has one entry for each HTLC, and in the same order.
+ ///
+ /// This function is only valid in the holder commitment context, it always uses SigHashType::All.
pub fn get_htlc_sigs<T: secp256k1::Signing>(&self, htlc_base_key: &SecretKey, channel_parameters: &DirectedChannelTransactionParameters, secp_ctx: &Secp256k1<T>) -> Result<Vec<Signature>, ()> {
let inner = self.inner;
let keys = &inner.keys;
for this_htlc in inner.htlcs.iter() {
assert!(this_htlc.transaction_output_index.is_some());
- let htlc_tx = build_htlc_transaction(&txid, inner.feerate_per_kw, channel_parameters.contest_delay(), &this_htlc, &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
+ let htlc_tx = build_htlc_transaction(&txid, inner.feerate_per_kw, channel_parameters.contest_delay(), &this_htlc, self.opt_anchors(), &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
- let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&this_htlc, &keys.broadcaster_htlc_key, &keys.countersignatory_htlc_key, &keys.revocation_key);
+ let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&this_htlc, self.opt_anchors(), &keys.broadcaster_htlc_key, &keys.countersignatory_htlc_key, &keys.revocation_key);
let sighash = hash_to_message!(&bip143::SigHashCache::new(&htlc_tx).signature_hash(0, &htlc_redeemscript, this_htlc.amount_msat / 1000, SigHashType::All)[..]);
ret.push(secp_ctx.sign(&sighash, &holder_htlc_key));
// Further, we should never be provided the preimage for an HTLC-Timeout transaction.
if this_htlc.offered && preimage.is_some() { unreachable!(); }
- let mut htlc_tx = build_htlc_transaction(&txid, inner.feerate_per_kw, channel_parameters.contest_delay(), &this_htlc, &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
+ let mut htlc_tx = build_htlc_transaction(&txid, inner.feerate_per_kw, channel_parameters.contest_delay(), &this_htlc, self.opt_anchors(), &keys.broadcaster_delayed_payment_key, &keys.revocation_key);
- let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&this_htlc, &keys.broadcaster_htlc_key, &keys.countersignatory_htlc_key, &keys.revocation_key);
+ let htlc_redeemscript = get_htlc_redeemscript_with_explicit_keys(&this_htlc, self.opt_anchors(), &keys.broadcaster_htlc_key, &keys.countersignatory_htlc_key, &keys.revocation_key);
+
+ let sighashtype = if self.opt_anchors() { SigHashType::SinglePlusAnyoneCanPay } else { SigHashType::All };
// First push the multisig dummy, note that due to BIP147 (NULLDUMMY) it must be a zero-length element.
htlc_tx.input[0].witness.push(Vec::new());
htlc_tx.input[0].witness.push(counterparty_signature.serialize_der().to_vec());
htlc_tx.input[0].witness.push(signature.serialize_der().to_vec());
- htlc_tx.input[0].witness[1].push(SigHashType::All as u8);
+ htlc_tx.input[0].witness[1].push(sighashtype as u8);
htlc_tx.input[0].witness[2].push(SigHashType::All as u8);
if this_htlc.offered {
| ((res[31] as u64) << 0 * 8)
}
-fn script_for_p2wpkh(key: &PublicKey) -> Script {
+fn get_p2wpkh_redeemscript(key: &PublicKey) -> Script {
Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0)
.push_slice(&WPubkeyHash::hash(&key.serialize())[..])
.into_script()
#[cfg(test)]
mod tests {
use super::CounterpartyCommitmentSecrets;
- use hex;
+ use ::{hex, chain};
use prelude::*;
+ use ln::chan_utils::{get_htlc_redeemscript, get_to_countersignatory_with_anchors_redeemscript, get_p2wpkh_redeemscript, CommitmentTransaction, TxCreationKeys, ChannelTransactionParameters, CounterpartyChannelTransactionParameters, HTLCOutputInCommitment};
+ use bitcoin::secp256k1::{PublicKey, SecretKey, Secp256k1};
+ use util::test_utils;
+ use chain::keysinterface::{KeysInterface, BaseSign};
+ use bitcoin::Network;
+ use ln::PaymentHash;
+ use bitcoin::hashes::hex::ToHex;
+
+ #[test]
+ fn test_anchors() {
+ let secp_ctx = Secp256k1::new();
+
+ let seed = [42; 32];
+ let network = Network::Testnet;
+ let keys_provider = test_utils::TestKeysInterface::new(&seed, network);
+ let signer = keys_provider.get_channel_signer(false, 3000);
+ let counterparty_signer = keys_provider.get_channel_signer(false, 3000);
+ let delayed_payment_base = &signer.pubkeys().delayed_payment_basepoint;
+ let per_commitment_secret = SecretKey::from_slice(&hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
+ let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
+ let htlc_basepoint = &signer.pubkeys().htlc_basepoint;
+ let holder_pubkeys = signer.pubkeys();
+ let counterparty_pubkeys = counterparty_signer.pubkeys();
+ let keys = TxCreationKeys::derive_new(&secp_ctx, &per_commitment_point, delayed_payment_base, htlc_basepoint, &counterparty_pubkeys.revocation_basepoint, &counterparty_pubkeys.htlc_basepoint).unwrap();
+ let mut channel_parameters = ChannelTransactionParameters {
+ holder_pubkeys: holder_pubkeys.clone(),
+ holder_selected_contest_delay: 0,
+ is_outbound_from_holder: false,
+ counterparty_parameters: Some(CounterpartyChannelTransactionParameters { pubkeys: counterparty_pubkeys.clone(), selected_contest_delay: 0 }),
+ funding_outpoint: Some(chain::transaction::OutPoint { txid: Default::default(), index: 0 }),
+ opt_anchors: None
+ };
+
+ let mut htlcs_with_aux: Vec<(_, ())> = Vec::new();
+
+ // Generate broadcaster and counterparty outputs
+ let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+ 0, 1000, 2000,
+ false,
+ holder_pubkeys.funding_pubkey,
+ counterparty_pubkeys.funding_pubkey,
+ keys.clone(), 1,
+ &mut htlcs_with_aux, &channel_parameters.as_holder_broadcastable()
+ );
+ assert_eq!(tx.built.transaction.output.len(), 2);
+ assert_eq!(tx.built.transaction.output[1].script_pubkey, get_p2wpkh_redeemscript(&counterparty_pubkeys.payment_point));
+
+ // Generate broadcaster and counterparty outputs as well as two anchors
+ let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+ 0, 1000, 2000,
+ true,
+ holder_pubkeys.funding_pubkey,
+ counterparty_pubkeys.funding_pubkey,
+ keys.clone(), 1,
+ &mut htlcs_with_aux, &channel_parameters.as_holder_broadcastable()
+ );
+ assert_eq!(tx.built.transaction.output.len(), 4);
+ assert_eq!(tx.built.transaction.output[3].script_pubkey, get_to_countersignatory_with_anchors_redeemscript(&counterparty_pubkeys.payment_point).to_v0_p2wsh());
+
+ // Generate broadcaster output and anchor
+ let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+ 0, 3000, 0,
+ true,
+ holder_pubkeys.funding_pubkey,
+ counterparty_pubkeys.funding_pubkey,
+ keys.clone(), 1,
+ &mut htlcs_with_aux, &channel_parameters.as_holder_broadcastable()
+ );
+ assert_eq!(tx.built.transaction.output.len(), 2);
+
+ // Generate counterparty output and anchor
+ let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+ 0, 0, 3000,
+ true,
+ holder_pubkeys.funding_pubkey,
+ counterparty_pubkeys.funding_pubkey,
+ keys.clone(), 1,
+ &mut htlcs_with_aux, &channel_parameters.as_holder_broadcastable()
+ );
+ assert_eq!(tx.built.transaction.output.len(), 2);
+
+ let received_htlc = HTLCOutputInCommitment {
+ offered: false,
+ amount_msat: 400000,
+ cltv_expiry: 100,
+ payment_hash: PaymentHash([42; 32]),
+ transaction_output_index: None,
+ };
+
+ let offered_htlc = HTLCOutputInCommitment {
+ offered: true,
+ amount_msat: 600000,
+ cltv_expiry: 100,
+ payment_hash: PaymentHash([43; 32]),
+ transaction_output_index: None,
+ };
+
+ // Generate broadcaster output and received and offered HTLC outputs, w/o anchors
+ let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+ 0, 3000, 0,
+ false,
+ holder_pubkeys.funding_pubkey,
+ counterparty_pubkeys.funding_pubkey,
+ keys.clone(), 1,
+ &mut vec![(received_htlc.clone(), ()), (offered_htlc.clone(), ())],
+ &channel_parameters.as_holder_broadcastable()
+ );
+ assert_eq!(tx.built.transaction.output.len(), 3);
+ assert_eq!(tx.built.transaction.output[0].script_pubkey, get_htlc_redeemscript(&received_htlc, false, &keys).to_v0_p2wsh());
+ assert_eq!(tx.built.transaction.output[1].script_pubkey, get_htlc_redeemscript(&offered_htlc, false, &keys).to_v0_p2wsh());
+ assert_eq!(get_htlc_redeemscript(&received_htlc, false, &keys).to_v0_p2wsh().to_hex(),
+ "002085cf52e41ba7c099a39df504e7b61f6de122971ceb53b06731876eaeb85e8dc5");
+ assert_eq!(get_htlc_redeemscript(&offered_htlc, false, &keys).to_v0_p2wsh().to_hex(),
+ "002049f0736bb335c61a04d2623a24df878a7592a3c51fa7258d41b2c85318265e73");
+
+ // Generate broadcaster output and received and offered HTLC outputs, with anchors
+ channel_parameters.opt_anchors = Some(());
+ let tx = CommitmentTransaction::new_with_auxiliary_htlc_data(
+ 0, 3000, 0,
+ true,
+ holder_pubkeys.funding_pubkey,
+ counterparty_pubkeys.funding_pubkey,
+ keys.clone(), 1,
+ &mut vec![(received_htlc.clone(), ()), (offered_htlc.clone(), ())],
+ &channel_parameters.as_holder_broadcastable()
+ );
+ assert_eq!(tx.built.transaction.output.len(), 5);
+ assert_eq!(tx.built.transaction.output[2].script_pubkey, get_htlc_redeemscript(&received_htlc, true, &keys).to_v0_p2wsh());
+ assert_eq!(tx.built.transaction.output[3].script_pubkey, get_htlc_redeemscript(&offered_htlc, true, &keys).to_v0_p2wsh());
+ assert_eq!(get_htlc_redeemscript(&received_htlc, true, &keys).to_v0_p2wsh().to_hex(),
+ "002067114123af3f95405bae4fd930fc95de03e3c86baaee8b2dd29b43dd26cf613c");
+ assert_eq!(get_htlc_redeemscript(&offered_htlc, true, &keys).to_v0_p2wsh().to_hex(),
+ "0020a06e3b0d4fcf704f2b9c41e16a70099e39989466c3142b8573a1154542f28f57");
+ }
#[test]
fn test_per_commitment_storage() {
projects / rust-lightning / blobdiff