static void Main(string[] args)
{
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
RSAParameters key = rsa.ExportParameters(true);
RSAKey pr = new RSAKey(key.Modulus, key.D);
RSAKey pu = new RSAKey(key.Modulus, key.Exponent);
string text = "im retarded";
string sign = Crypto.SignData(text, pr);
Console.WriteLine(Crypto.VerifyData(sign, text, pu));
Console.ReadKey();
}
public static string SignData(string data, RSAKey key)
{
BigInteger d = key.exponent;
BigInteger n = key.modulus;
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
Encoding asc = Encoding.ASCII;
byte[] textBytes = asc.GetBytes(data);
byte[] hash = sha.ComputeHash(textBytes);
BigInteger m = new BigInteger(Correct(hash.Reverse().ToArray()));
BigInteger s = BigInteger.ModPow(m, d, n);
byte[] signed = s.ToByteArray().Reverse().ToArray();
return(ToStrHex(signed, false));
}
public static bool VerifyData(string verData, string sigData, RSAKey key)
{
BigInteger e = key.exponent;
BigInteger n = key.modulus;
SHA1CryptoServiceProvider sha = new SHA1CryptoServiceProvider();
Encoding asc = Encoding.ASCII;
byte[] textBytes = asc.GetBytes(sigData);
byte[] hash = sha.ComputeHash(textBytes);
byte[] signed = HexToByteArray(verData);
BigInteger s = new BigInteger(Correct(signed.Reverse().ToArray()));
BigInteger m = BigInteger.ModPow(s, e, n);
return(m == new BigInteger(Correct(hash.Reverse().ToArray())));
}
