private static bool VerifySignature(string message, byte[] public_key_bytes, string signature)
{
var curve = SecNamedCurves.GetByName("secp256r1");
var domain = new ECDomainParameters(curve.Curve, curve.G, curve.N, curve.H);
//var publicKeyBytes = Base58Encoding.Decode(publicKey);
//var publicKeyBytes = Base58Encoding.DecodeWithCheckSum(publicKey);
//var publicKeyBytes = Base58Encoding.DecodePublicKey(publicKey);
var byte0 = new byte[public_key_bytes.Length + 1];
byte0[0] = 4;
Array.Copy(public_key_bytes, 0, byte0, 1, public_key_bytes.Length);
var q = curve.Curve.DecodePoint(byte0);
var keyParameters = new
Org.BouncyCastle.Crypto.Parameters.ECPublicKeyParameters(q,
domain);
ISigner signer = SignerUtilities.GetSigner("SHA-256withECDSA");
signer.Init(false, keyParameters);
signer.BlockUpdate(Encoding.UTF8.GetBytes(message), 0, message.Length);
var signatureBytes = Base58Encoding.Decode(signature);
var derSign = SignatureHelper.derSign(signatureBytes);
return(signer.VerifySignature(derSign));
}
public string Decrypt(string LocalPrivateKey, string RemoteAccountId, string Salt, string CipherText)
{
var secret = GetSharedSecret(LocalPrivateKey, RemoteAccountId);
var cipherTextBytes = Base58Encoding.Decode(CipherText);
var saltBytes = Encoding.Unicode.GetBytes(Salt.ToCharArray(), 0, 8);
using (var rijndael = new RijndaelManaged())
{
//rijndael.Key = secret;
//rijndael.IV = saltBytes;
var decryptor = rijndael.CreateDecryptor(secret, saltBytes);
using (var memoryStream = new MemoryStream(cipherTextBytes))
{
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(cryptoStream))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
var plainText = srDecrypt.ReadToEnd();
//var plainTextBytes = new byte[cipherTextBytes.Length];
//int plainTextByteActualSize = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);
//var plainText = Base58Encoding.Encode(plainTextBytes);
return(plainText);
}
}
}
}
}
public SignatureHolder(string signature)
{
var buff = Base58Encoding.Decode(signature);
var b1 = new byte[buff[0]];
var b2 = new byte[buff[1]];
Buffer.BlockCopy(buff, 2, b1, 0, b1.Length);
Buffer.BlockCopy(buff, 2 + b1.Length, b2, 0, b2.Length);
R = new BigInteger(b1);
S = new BigInteger(b2);
}
private static bool VerifySignature(string message, string AccountId, string signature)
{
try
{
var signatureBytes = Base58Encoding.Decode(signature);
var publicKeyBytes = Base58Encoding.DecodeAccountId(AccountId);
var result = Neo.Cryptography.Crypto.Default.VerifySignature(Encoding.UTF8.GetBytes(message), signatureBytes, publicKeyBytes);
return(result);
}
catch
{
//_log?.LogError("VerifySignature failed: " + ex.Message);
return(false);
}
}
