/// <summary>
/// Podpis hasha wiadomości
/// <param name="message">wiadomość do zahashowania</param>
/// <returns>podpisany hash</returns>
/// </summary>
// prywatne klucze własne
public byte[] HashSign(byte[] message)
{
using (RSA rsa = RSA.Create())
{
rsa.ImportParameters(rsaPrivateParams);
HashProgram hash = new HashProgram();
return(rsa.SignHash(hash.DoHash(message), HashAlgorithmName.SHA256, spadding));
}
}
/// <summary>
/// Konstruktor
/// </summary>
public SignProgram()
{
SetKeys();
ToFileRsa(rsaPrivateParams, PublicParameters);
ReadPublicXml(@"publicKeyPath.xml");
ReadPrivateXml(@"privateKeyPath.xml");
timeToSend = DateTime.Now.ToString("MM/dd/yyyy/HH/mm/ss");
HashProgram hash = new HashProgram();
string hashedTime = Convert.ToBase64String(hash.DoHash(timeToSend));
AddTimeToBase(hashedTime);
}
/// <summary>
/// Sprawdzenie hasha
/// </summary>
/// <param name="rsaParams">parametry RSA (klucz publiczny klienta)</param>
/// <param name="signedData">wiadomość podpisana</param>
/// <param name="signature">podpis</param>
/// <returns>czy hash jest poprawny</returns>
public bool VerifyHash(RSAParameters rsaParams, byte[] signedData, byte[] signature)
{
using (RSA rsa = RSA.Create())
{
rsa.ImportParameters(rsaParams);
bool dataOK = rsa.VerifyData(signedData, signature, HashAlgorithmName.SHA256, spadding);
HashProgram hash = new HashProgram();
return(rsa.VerifyHash(hash.DoHash(signedData), signature, HashAlgorithmName.SHA256, spadding));
}
}
public bool CheckNumbers(string msg, int option)
{
bool verifiedAll = false, verifiedTime = false, verifiedKeys = false;
char[] charSeparators = new char[] { ' ' };
string[] result;
result = msg.Split(charSeparators, StringSplitOptions.RemoveEmptyEntries);
string time = result[0];
switch (option)
{
case 0:
string modulus = result[1];
if (clientModulus == modulus)
{
verifiedKeys = true;
}
break;
case 1:
string exponent = result[1];
if (clientExponent == exponent)
{
verifiedKeys = true;
}
break;
default:
break;
}
string fileStream = @"base.txt", line, hashedTime;
HashProgram hash = new HashProgram();
hashedTime = Convert.ToBase64String(hash.DoHash(time));
for (int i = 0; i < File.ReadLines(fileStream).Count(); i++)
{
line = File.ReadLines(fileStream).Skip(i).Take(1).First();
if (line == hashedTime)
{
verifiedTime = true;
}
}
verifiedAll = verifiedKeys && verifiedTime;
return(verifiedAll);
}