+ /// Create a signature for a local commitment transaction. This will only ever be called with
+ /// the same local_commitment_tx (or a copy thereof), though there are currently no guarantees
+ /// that it will not be called multiple times.
+ //
+ // TODO: Document the things someone using this interface should enforce before signing.
+ // TODO: Add more input vars to enable better checking (preferably removing commitment_tx and
+ fn sign_local_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()>;
+
+ /// Same as sign_local_commitment, but exists only for tests to get access to local commitment
+ /// transactions which will be broadcasted later, after the channel has moved on to a newer
+ /// state. Thus, needs its own method as sign_local_commitment may enforce that we only ever
+ /// get called once.
+ #[cfg(test)]
+ fn unsafe_sign_local_commitment<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()>;
+
+ /// Create a signature for each HTLC transaction spending a local commitment transaction.
+ ///
+ /// Unlike sign_local_commitment, this may be called multiple times with *different*
+ /// local_commitment_tx values. While this will never be called with a revoked
+ /// local_commitment_tx, it is possible that it is called with the second-latest
+ /// local_commitment_tx (only if we haven't yet revoked it) if some watchtower/secondary
+ /// ChannelMonitor decided to broadcast before it had been updated to the latest.
+ ///
+ /// Either an Err should be returned, or a Vec with one entry for each HTLC which exists in
+ /// local_commitment_tx. For those HTLCs which have transaction_output_index set to None
+ /// (implying they were considered dust at the time the commitment transaction was negotiated),
+ /// a corresponding None should be included in the return value. All other positions in the
+ /// return value must contain a signature.
+ fn sign_local_commitment_htlc_transactions<T: secp256k1::Signing + secp256k1::Verification>(&self, local_commitment_tx: &LocalCommitmentTransaction, local_csv: u16, secp_ctx: &Secp256k1<T>) -> Result<Vec<Option<Signature>>, ()>;
+
+ /// Create a signature for a transaction spending an HTLC or commitment transaction output
+ /// when our counterparty broadcast an old state.
+ ///
+ /// Justice transaction may claim multiples outputs at same time if timelock are similar.
+ /// It may be called multiples time for same output(s) if a fee-bump is needed with regards
+ /// to an upcoming timelock expiration.
+ ///
+ /// Witness_script is a revokable witness script as defined in BOLT3 for `to_local`/HTLC
+ /// outputs.
+ ///
+ /// Input index is a pointer towards outpoint spent, commited by sigs (BIP 143).
+ ///
+ /// Amount is value of the output spent by this input, committed by sigs (BIP 143).
+ ///
+ /// Per_commitment key is revocation secret such as provided by remote party while
+ /// revocating detected onchain transaction. It's not a _local_ secret key, therefore
+ /// it may cross interfaces, a node compromise won't allow to spend revoked output without
+ /// also compromissing revocation key.
+ //TODO: dry-up witness_script and pass pubkeys
+ fn sign_justice_transaction<T: secp256k1::Signing>(&self, justice_tx: &Transaction, input: usize, witness_script: &Script, amount: u64, per_commitment_key: &SecretKey, revocation_pubkey: &PublicKey, is_htlc: bool, secp_ctx: &Secp256k1<T>) -> Result<Signature, ()>;
+