/// <remarks>
/// Encrypts the key package buffer
/// </remarks>
private void TransformBuffer(byte[] KeyData, byte[] Salt)
{
byte[] kvm = new byte[48];
// use salt to derive key and counter vector
using (Keccak512 digest = new Keccak512(384))
kvm = digest.ComputeHash(Salt);
byte[] key = new byte[32];
byte[] iv = new byte[16];
Buffer.BlockCopy(kvm, 0, key, 0, key.Length);
Buffer.BlockCopy(kvm, key.Length, iv, 0, iv.Length);
using (KeyParams keyparam = new KeyParams(key, iv))
{
// 40 rounds of serpent
using (CTR cipher = new CTR(new SPX(40)))
{
cipher.Initialize(true, keyparam);
cipher.Transform(KeyData, KeyData);
}
}
}
private void CTRTest(byte[] Key, byte[,][] Input, byte[,][] Output)
{
byte[] outBytes = new byte[16];
byte[] iv = _vectors[1];
int index = 24;
if (Key.Length == 24)
index = 26;
else if (Key.Length == 32)
index = 28;
using (CTR mode = new CTR(new RDX()))
{
mode.Initialize(true, new KeyParams(Key, iv));
for (int i = 0; i < 4; i++)
{
mode.Transform(Input[index, i], outBytes);
if (Compare.AreEqual(outBytes, Output[index, i]) == false)
throw new Exception("CTR Mode: Encrypted arrays are not equal!");
}
}
index++;
using (CTR mode = new CTR(new RDX()))
{
mode.Initialize(false, new KeyParams(Key, iv));
for (int i = 0; i < 4; i++)
{
mode.Transform(Input[index, i], outBytes);
if (Compare.AreEqual(outBytes, _output[index, i]) == false)
throw new Exception("CTR Mode: Decrypted arrays are not equal!");
}
}
}
