- /// This method should return a different value each time it is called, to avoid linking
- /// on-chain funds across channels as controlled to the same user.
- fn get_shutdown_scriptpubkey(&self) -> ShutdownScript;
+ /// The `hrp_bytes` are ASCII bytes, while the `invoice_data` is base32.
+ ///
+ /// The secret key used to sign the invoice is dependent on the [`Recipient`].
+ ///
+ /// 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.
+pub trait SignerProvider {
+ /// A type which implements [`WriteableEcdsaChannelSigner`] which will be returned by [`Self::derive_channel_signer`].
+ type Signer : WriteableEcdsaChannelSigner;
+