use util::crypto::sign;
pub(crate) const MAX_HTLCS: u16 = 483;
+pub(crate) const OFFERED_HTLC_SCRIPT_WEIGHT: usize = 133;
+pub(crate) const OFFERED_HTLC_SCRIPT_WEIGHT_ANCHORS: usize = 136;
+// The weight of `accepted_htlc_script` can vary in function of its CLTV argument value. We define a
+// range that encompasses both its non-anchors and anchors variants.
+pub(crate) const MIN_ACCEPTED_HTLC_SCRIPT_WEIGHT: usize = 136;
+pub(crate) const MAX_ACCEPTED_HTLC_SCRIPT_WEIGHT: usize = 143;
/// Gets the weight for an HTLC-Success transaction.
#[inline]
if opt_anchors { HTLC_TIMEOUT_ANCHOR_TX_WEIGHT } else { HTLC_TIMEOUT_TX_WEIGHT }
}
-#[derive(PartialEq)]
-pub(crate) enum HTLCType {
- AcceptedHTLC,
- OfferedHTLC
+#[derive(PartialEq, Eq)]
+pub(crate) enum HTLCClaim {
+ OfferedTimeout,
+ OfferedPreimage,
+ AcceptedTimeout,
+ AcceptedPreimage,
+ Revocation,
}
-impl HTLCType {
- /// Check if a given tx witnessScript len matchs one of a pre-signed HTLC
- pub(crate) fn scriptlen_to_htlctype(witness_script_len: usize) -> Option<HTLCType> {
- if witness_script_len == 133 {
- Some(HTLCType::OfferedHTLC)
- } else if witness_script_len >= 136 && witness_script_len <= 139 {
- Some(HTLCType::AcceptedHTLC)
+impl HTLCClaim {
+ /// Check if a given input witness attempts to claim a HTLC.
+ pub(crate) fn from_witness(witness: &Witness) -> Option<Self> {
+ debug_assert_eq!(OFFERED_HTLC_SCRIPT_WEIGHT_ANCHORS, MIN_ACCEPTED_HTLC_SCRIPT_WEIGHT);
+ if witness.len() < 2 {
+ return None;
+ }
+ let witness_script = witness.last().unwrap();
+ let second_to_last = witness.second_to_last().unwrap();
+ if witness_script.len() == OFFERED_HTLC_SCRIPT_WEIGHT {
+ if witness.len() == 3 && second_to_last.len() == 33 {
+ // <revocation sig> <revocationpubkey> <witness_script>
+ Some(Self::Revocation)
+ } else if witness.len() == 3 && second_to_last.len() == 32 {
+ // <remotehtlcsig> <payment_preimage> <witness_script>
+ Some(Self::OfferedPreimage)
+ } else if witness.len() == 5 && second_to_last.len() == 0 {
+ // 0 <remotehtlcsig> <localhtlcsig> <> <witness_script>
+ Some(Self::OfferedTimeout)
+ } else {
+ None
+ }
+ } else if witness_script.len() == OFFERED_HTLC_SCRIPT_WEIGHT_ANCHORS {
+ // It's possible for the weight of `offered_htlc_script` and `accepted_htlc_script` to
+ // match so we check for both here.
+ if witness.len() == 3 && second_to_last.len() == 33 {
+ // <revocation sig> <revocationpubkey> <witness_script>
+ Some(Self::Revocation)
+ } else if witness.len() == 3 && second_to_last.len() == 32 {
+ // <remotehtlcsig> <payment_preimage> <witness_script>
+ Some(Self::OfferedPreimage)
+ } else if witness.len() == 5 && second_to_last.len() == 0 {
+ // 0 <remotehtlcsig> <localhtlcsig> <> <witness_script>
+ Some(Self::OfferedTimeout)
+ } else if witness.len() == 3 && second_to_last.len() == 0 {
+ // <remotehtlcsig> <> <witness_script>
+ Some(Self::AcceptedTimeout)
+ } else if witness.len() == 5 && second_to_last.len() == 32 {
+ // 0 <remotehtlcsig> <localhtlcsig> <payment_preimage> <witness_script>
+ Some(Self::AcceptedPreimage)
+ } else {
+ None
+ }
+ } else if witness_script.len() > MIN_ACCEPTED_HTLC_SCRIPT_WEIGHT &&
+ witness_script.len() <= MAX_ACCEPTED_HTLC_SCRIPT_WEIGHT {
+ // Handle remaining range of ACCEPTED_HTLC_SCRIPT_WEIGHT.
+ if witness.len() == 3 && second_to_last.len() == 33 {
+ // <revocation sig> <revocationpubkey> <witness_script>
+ Some(Self::Revocation)
+ } else if witness.len() == 3 && second_to_last.len() == 0 {
+ // <remotehtlcsig> <> <witness_script>
+ Some(Self::AcceptedTimeout)
+ } else if witness.len() == 5 && second_to_last.len() == 32 {
+ // 0 <remotehtlcsig> <localhtlcsig> <payment_preimage> <witness_script>
+ Some(Self::AcceptedPreimage)
+ } else {
+ None
+ }
} else {
None
}
old_secrets: [([u8; 32], u64); 49],
}
+impl Eq for CounterpartyCommitmentSecrets {}
impl PartialEq for CounterpartyCommitmentSecrets {
fn eq(&self, other: &Self) -> bool {
for (&(ref secret, ref idx), &(ref o_secret, ref o_idx)) in self.old_secrets.iter().zip(other.old_secrets.iter()) {
/// Derives a per-commitment-transaction revocation key from its constituent parts.
///
-/// Only the cheating participant owns a valid witness to propagate a revoked
+/// Only the cheating participant owns a valid witness to propagate a revoked
/// commitment transaction, thus per_commitment_secret always come from cheater
/// and revocation_base_secret always come from punisher, which is the broadcaster
/// of the transaction spending with this key knowledge.
/// the public equivalend of derive_private_revocation_key - using only public keys to derive a
/// public key instead of private keys.
///
-/// Only the cheating participant owns a valid witness to propagate a revoked
+/// Only the cheating participant owns a valid witness to propagate a revoked
/// commitment transaction, thus per_commitment_point always come from cheater
/// and revocation_base_point always come from punisher, which is the broadcaster
/// of the transaction spending with this key knowledge.
/// channel basepoints via the new function, or they were obtained via
/// CommitmentTransaction.trust().keys() because we trusted the source of the
/// pre-calculated keys.
-#[derive(PartialEq, Clone)]
+#[derive(PartialEq, Eq, Clone)]
pub struct TxCreationKeys {
/// The broadcaster's per-commitment public key which was used to derive the other keys.
pub per_commitment_point: PublicKey,
});
/// One counterparty's public keys which do not change over the life of a channel.
-#[derive(Clone, PartialEq)]
+#[derive(Clone, PartialEq, Eq)]
pub struct ChannelPublicKeys {
/// The public key which is used to sign all commitment transactions, as it appears in the
/// on-chain channel lock-in 2-of-2 multisig output.
res
}
-#[derive(Clone, PartialEq)]
+#[derive(Clone, PartialEq, Eq)]
/// Information about an HTLC as it appears in a commitment transaction
pub struct HTLCOutputInCommitment {
/// Whether the HTLC was "offered" (ie outbound in relation to this commitment transaction).
} else {
htlc_success_tx_weight(opt_anchors)
};
- let total_fee = feerate_per_kw as u64 * weight / 1000;
+ let output_value = if opt_anchors {
+ htlc.amount_msat / 1000
+ } else {
+ let total_fee = feerate_per_kw as u64 * weight / 1000;
+ htlc.amount_msat / 1000 - total_fee
+ };
let mut txouts: Vec<TxOut> = Vec::new();
txouts.push(TxOut {
script_pubkey: get_revokeable_redeemscript(revocation_key, contest_delay, broadcaster_delayed_payment_key).to_v0_p2wsh(),
- 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)
+ value: output_value,
});
Transaction {
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
+ /// Are anchors (zero fee HTLC transaction variant) used for this channel. Boolean is
+ /// serialization backwards-compatible.
pub opt_anchors: Option<()>
}
fn deref(&self) -> &Self::Target { &self.inner }
}
+impl Eq for HolderCommitmentTransaction {}
impl PartialEq for HolderCommitmentTransaction {
// We dont care whether we are signed in equality comparison
fn eq(&self, o: &Self) -> bool {
///
/// This class can be used inside a signer implementation to generate a signature given the relevant
/// secret key.
-#[derive(Clone, Hash, PartialEq)]
+#[derive(Clone, Hash, PartialEq, Eq)]
pub struct ClosingTransaction {
to_holder_value_sat: u64,
to_counterparty_value_sat: u64,
built: BuiltCommitmentTransaction,
}
+impl Eq for CommitmentTransaction {}
impl PartialEq for CommitmentTransaction {
fn eq(&self, o: &Self) -> bool {
let eq = self.commitment_number == o.commitment_number &&