X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=ldk-c-bindings;a=blobdiff_plain;f=lightning-c-bindings%2Fsrc%2Fc_types%2Fmod.rs;h=b28bc80fd264f8ea232723adabc07614a1525b6c;hp=cd96dffe1969bbe6c845fcfa0ff2ec73e64dff4a;hb=9069bc0ea8b7fdaa9ee276d78fb0610157edbcf2;hpb=ddf74802a4421f1ea1e221d801b3c342a32fade4

diff --git a/lightning-c-bindings/src/c_types/mod.rs b/lightning-c-bindings/src/c_types/mod.rs
index cd96dff..b28bc80 100644
--- a/lightning-c-bindings/src/c_types/mod.rs
+++ b/lightning-c-bindings/src/c_types/mod.rs
@@ -9,6 +9,8 @@ use bitcoin::secp256k1::key::PublicKey as SecpPublicKey;
 use bitcoin::secp256k1::key::SecretKey as SecpSecretKey;
 use bitcoin::secp256k1::Signature as SecpSignature;
 use bitcoin::secp256k1::Error as SecpError;
+use bitcoin::secp256k1::recovery::RecoveryId;
+use bitcoin::secp256k1::recovery::RecoverableSignature as SecpRecoverableSignature;
 use bitcoin::bech32;
 
 use std::convert::TryInto; // Bindings need at least rustc 1.34
@@ -85,6 +87,32 @@ impl Signature {
 	#[allow(unused)] pub(crate) fn null() -> Self { Self { compact_form: [0; 64] } }
 }
 
+#[repr(C)]
+#[derive(Clone)]
+/// Represents a secp256k1 signature serialized as two 32-byte numbers as well as a tag which
+/// allows recovering the exact public key which created the signature given the message.
+pub struct RecoverableSignature {
+	/// The bytes of the signature in "compact" form plus a "Recovery ID" which allows for
+	/// recovery.
+	pub serialized_form: [u8; 68],
+}
+impl RecoverableSignature {
+	pub(crate) fn from_rust(pk: &SecpRecoverableSignature) -> Self {
+		let (id, compact_form) = pk.serialize_compact();
+		let mut serialized_form = [0; 68];
+		serialized_form[0..64].copy_from_slice(&compact_form[..]);
+		serialized_form[64..].copy_from_slice(&id.to_i32().to_le_bytes());
+		Self { serialized_form }
+	}
+	pub(crate) fn into_rust(&self) -> SecpRecoverableSignature {
+		let mut id = [0; 4];
+		id.copy_from_slice(&self.serialized_form[64..]);
+		SecpRecoverableSignature::from_compact(&self.serialized_form[0..64],
+				RecoveryId::from_i32(i32::from_le_bytes(id)).expect("Invalid Recovery ID"))
+			.unwrap()
+	}
+}
+
 #[repr(C)]
 /// Represents an error returned from libsecp256k1 during validation of some secp256k1 data
 pub enum Secp256k1Error {