From c41a6e9b1bdc2f60b80519ab5b3fbb9f0eb46acb Mon Sep 17 00:00:00 2001
From: ChrisCho-H <c.hyunhum@gmail.com>
Date: Sat, 12 Oct 2024 12:37:04 +0900
Subject: [PATCH] feat: add sign fn for sign_message

---
 bitcoin/src/sign_message.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/bitcoin/src/sign_message.rs b/bitcoin/src/sign_message.rs
index 5f2f183db..dc2e6db34 100644
--- a/bitcoin/src/sign_message.rs
+++ b/bitcoin/src/sign_message.rs
@@ -6,6 +6,7 @@
 //! library is used with the `secp-recovery` feature.
 
 use hashes::{sha256d, HashEngine};
+use secp256k1::SecretKey;
 
 use crate::consensus::encode::WriteExt;
 
@@ -214,6 +215,19 @@ pub fn signed_msg_hash(msg: impl AsRef<[u8]>) -> sha256d::Hash {
     sha256d::Hash::from_engine(engine)
 }
 
+/// Sign message using Bitcoin's message signing format.
+#[cfg(feature = "secp-recovery")]
+pub fn sign<C: secp256k1::Signing>(
+    secp_ctx: &secp256k1::Secp256k1<C>,
+    msg: impl AsRef<[u8]>,
+    privkey: SecretKey,
+) -> MessageSignature {
+    let msg_hash = signed_msg_hash(msg);
+    let msg_to_sign = secp256k1::Message::from_digest(msg_hash.to_byte_array());
+    let secp_sig = secp_ctx.sign_ecdsa_recoverable(&msg_to_sign, &privkey);
+    MessageSignature { signature: secp_sig, compressed: true }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;