Add NodeSigner::sign_gossip_message

[rust-lightning] / lightning / src / chain / keysinterface.rs

diff --git a/lightning/src/chain/keysinterface.rs b/lightning/src/chain/keysinterface.rs
index 9fc00e25238dc8b375d247aec5c8114ce508f109..83243ee88d57dc7c966cbc77549d281e54f9f62f 100644 (file)
--- a/lightning/src/chain/keysinterface.rs
+++ b/lightning/src/chain/keysinterface.rs
@@ -41,7 +41,7 @@ use crate::chain::transaction::OutPoint;
 use crate::ln::channel::ANCHOR_OUTPUT_VALUE_SATOSHI;
 use crate::ln::{chan_utils, PaymentPreimage};
 use crate::ln::chan_utils::{HTLCOutputInCommitment, make_funding_redeemscript, ChannelPublicKeys, HolderCommitmentTransaction, ChannelTransactionParameters, CommitmentTransaction, ClosingTransaction};
-use crate::ln::msgs::UnsignedChannelAnnouncement;
+use crate::ln::msgs::{UnsignedChannelAnnouncement, UnsignedGossipMessage};
 use crate::ln::script::ShutdownScript;
 
 use crate::prelude::*;
@@ -494,6 +494,14 @@ pub trait NodeSigner {
        ///
        /// Errors if the [`Recipient`] variant is not supported by the implementation.
        fn sign_invoice(&self, hrp_bytes: &[u8], invoice_data: &[u5], recipient: Recipient) -> Result<RecoverableSignature, ()>;
+
+       /// Sign a gossip message.
+       ///
+       /// Note that if this fails, LDK may panic and the message will not be broadcast to the network
+       /// or a possible channel counterparty. If LDK panics, the error should be resolved to allow the
+       /// message to be broadcast, as otherwise it may prevent one from receiving funds over the
+       /// corresponding channel.
+       fn sign_gossip_message(&self, msg: UnsignedGossipMessage) -> Result<Signature, ()>;
 }
 
 /// A trait that can return signer instances for individual channels.
@@ -1290,6 +1298,11 @@ impl NodeSigner for KeysManager {
                };
                Ok(self.secp_ctx.sign_ecdsa_recoverable(&hash_to_message!(&Sha256::hash(&preimage)), &secret))
        }
+
+       fn sign_gossip_message(&self, msg: UnsignedGossipMessage) -> Result<Signature, ()> {
+               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.encode()[..])[..]);
+               Ok(sign(&self.secp_ctx, &msg_hash, &self.node_secret))
+       }
 }
 
 impl SignerProvider for KeysManager {
@@ -1394,6 +1407,10 @@ impl NodeSigner for PhantomKeysManager {
                let secret = self.get_node_secret(recipient)?;
                Ok(self.inner.secp_ctx.sign_ecdsa_recoverable(&hash_to_message!(&Sha256::hash(&preimage)), &secret))
        }
+
+       fn sign_gossip_message(&self, msg: UnsignedGossipMessage) -> Result<Signature, ()> {
+               self.inner.sign_gossip_message(msg)
+       }
 }
 
 impl SignerProvider for PhantomKeysManager {