public virtual bool VerifySignature(byte[] signature)
{
try
{
BigInteger[] rs = encoding.Decode(ecParams.N, signature);
return(VerifySignature(rs[0], rs[1]));
}
catch (Exception)
{
}
return(false);
}
/// <returns>true if the internal state represents the signature described in the passed in array.</returns>
public virtual bool VerifySignature(
byte[] signature)
{
if (forSigning)
{
throw new InvalidOperationException("DSADigestSigner not initialised for verification");
}
byte[] hash = new byte[digest.GetDigestSize()];
digest.DoFinal(hash, 0);
try
{
BigInteger[] sig = encoding.Decode(GetOrder(), signature);
return(dsa.VerifySignature(hash, sig[0], sig[1]));
}
catch (Exception e)
{
return(false);
}
}
public static string GenerateSignature(string InputData, string PrivateKeyPath, string PublicKeyPath)
{
string s = InputData;
// s = "20685b5fbfe1898fbb080b0719acc9ed2f365128627f21ffcc1b1ee27471e69e";
try
{
IDsaEncoding encoding = StandardDsaEncoding.Instance;
var encoder = new ASCIIEncoding();
var bencoder = new Base64Encoder();
//var key = GenerateKeys(128);
AsymmetricCipherKeyPair MyKey = getPrivateKeyFromPemFile(PrivateKeyPath);
ECPublicKeyParameters pubicKey = getPublicKeyFromPemFile(PublicKeyPath);
//var pubicKey = (ECPublicKeyParameters)(MyKey1.Public);
var privateKey = (ECPrivateKeyParameters)(MyKey.Private);
var signature = GetSignature(s, privateKey);
BigInteger[] sig = encoding.Decode(GetOrder(), signature);
//System.Numerics.BigInteger sigval = 0;
//System.Numerics.BigInteger.TryParse(sig[1].ToString(), out sigval);
var finalsignature = sig[0].ToString(16) + sig[1].ToString(16);
var signatureOK = VerifySignature(pubicKey, s, signature);
if (signatureOK)
{
return(finalsignature);
}
else
{
return("");
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return("");
}
}