Extend BaseSign with HTLC output signing support for external claims

[rust-lightning] / lightning / src / util / enforcing_trait_impls.rs

diff --git a/lightning/src/util/enforcing_trait_impls.rs b/lightning/src/util/enforcing_trait_impls.rs
index 21ef5d4b17887361d4faed1b885ecb765c6a2339..1a9038a2f5dc1c3c2122e71f8f6a5b0d4e945782 100644 (file)
--- a/lightning/src/util/enforcing_trait_impls.rs
+++ b/lightning/src/util/enforcing_trait_impls.rs
@@ -23,6 +23,8 @@ use bitcoin::util::sighash;
 use bitcoin::secp256k1;
 use bitcoin::secp256k1::{SecretKey, PublicKey};
 use bitcoin::secp256k1::{Secp256k1, ecdsa::Signature};
+#[cfg(anchors)]
+use crate::util::events::HTLCDescriptor;
 use crate::util::ser::{Writeable, Writer};
 use crate::io::Error;
 
@@ -190,6 +192,17 @@ impl BaseSign for EnforcingSigner {
                Ok(self.inner.sign_justice_revoked_htlc(justice_tx, input, amount, per_commitment_key, htlc, secp_ctx).unwrap())
        }
 
+       #[cfg(anchors)]
+       fn sign_holder_htlc_transaction(
+               &self, htlc_tx: &Transaction, input: usize, htlc_descriptor: &HTLCDescriptor,
+               secp_ctx: &Secp256k1<secp256k1::All>
+       ) -> Result<Signature, ()> {
+               let per_commitment_point = self.get_per_commitment_point(htlc_descriptor.per_commitment_number, secp_ctx);
+               assert_eq!(htlc_tx.input[input], htlc_descriptor.unsigned_tx_input());
+               assert_eq!(htlc_tx.output[input], htlc_descriptor.tx_output(&per_commitment_point, secp_ctx));
+               Ok(self.inner.sign_holder_htlc_transaction(htlc_tx, input, htlc_descriptor, secp_ctx).unwrap())
+       }
+
        fn sign_counterparty_htlc_transaction(&self, htlc_tx: &Transaction, input: usize, amount: u64, per_commitment_point: &PublicKey, htlc: &HTLCOutputInCommitment, secp_ctx: &Secp256k1<secp256k1::All>) -> Result<Signature, ()> {
                Ok(self.inner.sign_counterparty_htlc_transaction(htlc_tx, input, amount, per_commitment_point, htlc, secp_ctx).unwrap())
        }