public TripleDESTransform(TripleDES algo, bool encryption, byte[] key, byte[] iv) : base(algo, encryption, iv)
{
if (key == null)
{
key = TripleDESTransform.GetStrongKey();
}
if (TripleDES.IsWeakKey(key))
{
string text = Locale.GetText("This is a known weak key.");
throw new CryptographicException(text);
}
byte[] array = new byte[8];
byte[] array2 = new byte[8];
byte[] array3 = new byte[8];
DES symmAlgo = DES.Create();
Buffer.BlockCopy(key, 0, array, 0, 8);
Buffer.BlockCopy(key, 8, array2, 0, 8);
if (key.Length == 16)
{
Buffer.BlockCopy(key, 0, array3, 0, 8);
}
else
{
Buffer.BlockCopy(key, 16, array3, 0, 8);
}
if (encryption || algo.Mode == CipherMode.CFB)
{
this.E1 = new DESTransform(symmAlgo, true, array, iv);
this.D2 = new DESTransform(symmAlgo, false, array2, iv);
this.E3 = new DESTransform(symmAlgo, true, array3, iv);
}
else
{
this.D1 = new DESTransform(symmAlgo, false, array3, iv);
this.E2 = new DESTransform(symmAlgo, true, array2, iv);
this.D3 = new DESTransform(symmAlgo, false, array, iv);
}
}
public override void GenerateKey()
{
KeyValue = TripleDESTransform.GetStrongKey();
}
