public bool VerifySignature(byte[] message, byte[] signature, byte[] pubkey)
{
using (ECC.ECDsa ecdsa = new ECC.ECDsa(ECC.ECPoint.DecodePoint(pubkey, ECC.ECCurve.Secp256)))
{
byte[] rb = new byte[32];
byte[] sb = new byte[32];
Buffer.BlockCopy(signature, 0, rb, 0, 32);
Buffer.BlockCopy(signature, 32, sb, 0, 32);
byte[] hash = Hash256(message);
BigInteger r = rb.ToBigIntegerUnsigned(true);
BigInteger s = sb.ToBigIntegerUnsigned(true);
return(ecdsa.VerifySignature(hash, r, s));
}
}
public byte[] Sign(byte[] message, byte[] privateKey, byte[] publicKey)
{
using (ECC.ECDsa ecdsa = new ECC.ECDsa(privateKey, ECC.ECCurve.Secp256))
{
byte[] hash = Hash256(message);
BigInteger[] signature = ecdsa.GenerateSignature(hash);
byte[] signatureBytes = new byte[64];
byte[] rb = signature[0].ToByteArrayUnsigned(true);
byte[] sb = signature[1].ToByteArrayUnsigned(true);
Buffer.BlockCopy(rb, 0, signatureBytes, 0 + (32 - rb.Length), rb.Length);
Buffer.BlockCopy(sb, 0, signatureBytes, 32 + (32 - sb.Length), sb.Length);
return(signatureBytes);
}
}