public static byte[] RecoverKeyFromCompact(byte[] messageHash, byte[] compactSignature, int recoveryId, bool compressed)
{
byte[] publicKey = new byte[64];
byte[] serializedPublicKey = new byte[compressed ? 33 : 65];
uint outputSize = (uint)serializedPublicKey.Length;
uint flags = compressed ? Secp256K1EcCompressed : Secp256K1EcUncompressed;
byte[] recoverableSignature = new byte[65];
if (IsWindows
? !Win64Lib.secp256k1_ecdsa_recoverable_signature_parse_compact(Context, recoverableSignature, compactSignature, recoveryId)
: !PosixLib.secp256k1_ecdsa_recoverable_signature_parse_compact(Context, recoverableSignature, compactSignature, recoveryId))
{
return(null);
}
if (IsWindows
? !Win64Lib.secp256k1_ecdsa_recover(Context, publicKey, recoverableSignature, messageHash)
: !PosixLib.secp256k1_ecdsa_recover(Context, publicKey, recoverableSignature, messageHash))
{
return(null);
}
if (IsWindows
? !Win64Lib.secp256k1_ec_pubkey_serialize(Context, serializedPublicKey, ref outputSize, publicKey, flags)
: !PosixLib.secp256k1_ec_pubkey_serialize(Context, serializedPublicKey, ref outputSize, publicKey, flags))
{
return(null);
}
return(serializedPublicKey);
}