public byte[] DecryptText(EncryptTextMessage message)
{
byte[] decryptedText = null;
//Odradi se enkripcija
if (message.Algorithm == AlgorithmType.RC4)
{
RC4 rc = new RC4(message.Key, message.IV);
decryptedText = rc.Decrypt(message.Data);
}
else if (message.Algorithm == AlgorithmType.RC4CTR)
{
RC4 rc = new RC4(message.Key, message.IV);
decryptedText = rc.DecryptWithCTR(message.Data);
}
else if (message.Algorithm == AlgorithmType.A52 || message.Algorithm == AlgorithmType.A52CTR)
{
A52 alg = new A52();
alg.SetKey(message.Key);
alg.SetF(message.FKeyA52);
if (message.Algorithm == AlgorithmType.A52)
{
decryptedText = alg.Decrypt(message.Data);
}
else
{
alg.SetIV(message.IV);
decryptedText = alg.DecryptWithCTR(message.Data);
}
}
else if (message.Algorithm == AlgorithmType.RSA)
{
RSA rsa = new RSA();
rsa.E = new BigInteger(message.Key);
rsa.P = new BigInteger(message.P);
rsa.Q = new BigInteger(message.Q);
rsa.GenerateRSA();
//BigInteger result = rsa.Decrypt(new BigInteger(message.Data));
//decryptedText = result.ToByteArray();
decryptedText = rsa.Decrypt(message.Data);
}
return(decryptedText);
}