public override byte[] Sign(byte[] input)
{
var ecDsaSigner = new ECDsaSigner();
BouncyCastleEcdsaSecurityKey key = Key as BouncyCastleEcdsaSecurityKey;
ecDsaSigner.Init(true, key.KeyParameters);
byte[] hashedInput;
using (var hasher = SHA256.Create())
{
hashedInput = hasher.ComputeHash(input);
}
var output = ecDsaSigner.GenerateSignature(hashedInput);
var r = output[0].ToByteArrayUnsigned();
var s = output[1].ToByteArrayUnsigned();
var signature = new byte[r.Length + s.Length];
r.CopyTo(signature, 0);
s.CopyTo(signature, r.Length);
return(signature);
}
public override bool Verify(byte[] input, byte[] signature)
{
var ecDsaSigner = new ECDsaSigner();
BouncyCastleEcdsaSecurityKey key = Key as BouncyCastleEcdsaSecurityKey;
ecDsaSigner.Init(false, key.KeyParameters);
byte[] hashedInput;
using (var hasher = SHA256.Create())
{
hashedInput = hasher.ComputeHash(input);
}
var r = new BigInteger(1, signature.Take(32).ToArray());
var s = new BigInteger(1, signature.Skip(32).ToArray());
return(ecDsaSigner.VerifySignature(hashedInput, r, s));
}
public CustomSignatureProvider(BouncyCastleEcdsaSecurityKey key, string algorithm)
: base(key, algorithm)
{
}
