private PrivateKey GeneratePrivateKey(PrivateComponents privateComponents, PublicKey publicKey)
{
var phi = (privateComponents.q - 1) * (privateComponents.p - 1);
var d = BigIntegerHelper.GetInverse(publicKey.e, phi);
return new PrivateKey
{
d = d,
r = publicKey.r
};
}
private PublicKey GeneratePublicKey(PrivateComponents key)
{
var r = key.q * key.p;
var phi = (key.q - 1) * (key.p - 1);
var rLength = r.ToByteArray().Length;
var e = generator.GetPrimeNumber(rLength - 2, rLength - 2, n => n < phi);
return new PublicKey
{
e = e,
r = r
};
}
public byte[] Decrypt(byte[] message, PrivateComponents privateComponents, PublicKey publicKey)
{
var phi = (privateComponents.q - 1) * (privateComponents.p - 1);
var d = BigIntegerHelper.GetInverse(publicKey.e, phi);
return Decrypt(message, new PrivateKey { d = d, r = publicKey.r });
//var keySize = publicKey.r.ToByteArray().Length;
//var encryptedBlockSize = keySize;
//var sourceBlockSize = keySize - 2;
//var numberBlocks = message.Length / encryptedBlockSize;
//if (message.Length % encryptedBlockSize != 0)
// throw new ArgumentException("Wrong size of encrypted message");
//var decryptedMessage = new byte[numberBlocks * sourceBlockSize];
//Parallel.For(0, numberBlocks - 1, (i) =>
////for (var i = 0; i < numberBlocks; i++)
//{
// var part = new byte[encryptedBlockSize];
// Array.Copy(message, i * encryptedBlockSize, part, 0, encryptedBlockSize);
// var Mi = new BigInteger(part);
// var mi = BigInteger.ModPow(Mi, d, publicKey.r);
// Array.Copy(mi.ToByteArray(), 0, decryptedMessage, i * sourceBlockSize, sourceBlockSize);
//});
//var lastPart = new byte[encryptedBlockSize];
//Array.Copy(message, (numberBlocks - 1) * encryptedBlockSize, lastPart, 0, encryptedBlockSize);
//var lMi = new BigInteger(lastPart);
//var lmi = BigInteger.ModPow(lMi, d, publicKey.r);
//var lmiBytes = lmi.ToByteArray();
//var countBytes = lmiBytes.Length;
//Array.Copy(lmi.ToByteArray(), 0, decryptedMessage, (numberBlocks - 1) * sourceBlockSize, countBytes);
//var realSize = sourceBlockSize * (numberBlocks - 1) + countBytes;
//var trimMessage = new byte[realSize];
//Array.Copy(decryptedMessage, 0, trimMessage, 0, realSize);
//return trimMessage;
}
