From: Wilmer Paulino <wilmer.paulino@gmail.com>
Date: Thu, 25 Aug 2022 20:27:00 +0000 (-0700)
Subject: Use proper sighash flag for remote HTLCs with anchor outputs
X-Git-Tag: v0.0.112~40^2~6
X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=commitdiff_plain;h=2f4a1f7f79e55d28b289f4907e019e66a251a19e;p=rust-lightning

Use proper sighash flag for remote HTLCs with anchor outputs
---

diff --git a/lightning/src/util/enforcing_trait_impls.rs b/lightning/src/util/enforcing_trait_impls.rs
index b4b66e8f5..f4450cc12 100644
--- a/lightning/src/util/enforcing_trait_impls.rs
+++ b/lightning/src/util/enforcing_trait_impls.rs
@@ -160,7 +160,16 @@ impl BaseSign for EnforcingSigner {
 
 			let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&this_htlc, self.opt_anchors(), &keys);
 
-			let sighash = hash_to_message!(&sighash::SighashCache::new(&htlc_tx).segwit_signature_hash(0, &htlc_redeemscript, this_htlc.amount_msat / 1000, EcdsaSighashType::All).unwrap()[..]);
+			let sighash_type = if self.opt_anchors() {
+				EcdsaSighashType::SinglePlusAnyoneCanPay
+			} else {
+				EcdsaSighashType::All
+			};
+			let sighash = hash_to_message!(
+				&sighash::SighashCache::new(&htlc_tx).segwit_signature_hash(
+					0, &htlc_redeemscript, this_htlc.amount_msat / 1000, sighash_type,
+				).unwrap()[..]
+			);
 			secp_ctx.verify_ecdsa(&sighash, sig, &keys.countersignatory_htlc_key).unwrap();
 		}