public static string Decrypt(BigInteger message, RSAKey key)
{
var bi = BigInteger.ModPow(message, key.KeyOne, key.KeyTwo);
string output = Encoding.UTF8.GetString(bi.ToByteArray());
return(output);
}
public static string Decrypt(List <BigInteger> message, RSAKey key)
{
string decrypted = "";
foreach (var item in message)
{
decrypted += Decrypt(item, key);
}
return(decrypted);
}
public RSAProvider(KeySize size)
{
keySize = size;
number1 = InitializeRandom();
number2 = InitializeRandom();
composition = number1 * number2;
eulerFunc = (number1 - 1) * (number2 - 1);
publicExhibitor = GetPublicExhibitor();
privateExhibitor = GetPrivateExhibitor();
PublicKey = new RSAKey(publicExhibitor, composition);
PrivateKey = new RSAKey(privateExhibitor, composition);
//SessionKey = InitializeRandom();
}
public static List <string> Encrypt2(string message, RSAKey key)
{
List <string> res = new List <string>();
var keyLength = key.KeyTwo.ToByteArray().Length;
var limit = keyLength / 8;
if (message.Length > limit)
{
var iterations = System.Math.Ceiling((float)message.Length / (float)(limit));
for (int i = 0; i < iterations; i++)
{
var t = new string(message.Skip(i * (limit)).Take((limit)).ToArray());
res.Add(Encrypt(t, key).ToString());
}
}
else
{
res.Add(Encrypt(message, key).ToString());
}
return(res);
}
private static BigInteger Encrypt(BigInteger message, RSAKey key)
{
return(BigInteger.ModPow(message, key.KeyOne, key.KeyTwo));
}
public static BigInteger Encrypt(string message, RSAKey key)
{
BigInteger bi = new BigInteger(Encoding.UTF8.GetBytes(message));
return(Encrypt(bi, key));
}