Make derive_private_key public

diff --git a/lightning/src/ln/chan_utils.rs b/lightning/src/ln/chan_utils.rs
index e619716a3cc8cfea5cd4c4688da6f5dad5056729..f4baf668f5651a4a62690ffe583a9a36b5a54176 100644 (file)
--- a/lightning/src/ln/chan_utils.rs
+++ b/lightning/src/ln/chan_utils.rs
@@ -171,9 +171,10 @@ impl Readable for CounterpartyCommitmentSecrets {
        }
 }
 
-/// Derives a per-commitment-transaction private key (eg an htlc key or payment key) from the base
+/// Derives a per-commitment-transaction private key (eg an htlc key, payment key or delayed_payment
+/// key) from the base.
 /// private key for that type of key and the per_commitment_point (available in TxCreationKeys)
-pub(crate) fn derive_private_key<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, base_secret: &SecretKey) -> Result<SecretKey, secp256k1::Error> {
+pub fn derive_private_key<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, per_commitment_point: &PublicKey, base_secret: &SecretKey) -> Result<SecretKey, secp256k1::Error> {
        let mut sha = Sha256::engine();
        sha.input(&per_commitment_point.serialize());
        sha.input(&PublicKey::from_secret_key(&secp_ctx, &base_secret).serialize());