/// <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);
}
}
}
/// <summary>
/// Test the StreamDigest class implementation
/// <para>Throws an Exception on failure</</para>
/// </summary>
public static void StreamDigestTest()
{
byte[] data;
MemoryStream instrm;
MemoryStream outstrm = new MemoryStream();
using (KeyGenerator kg = new KeyGenerator())
data = kg.GetBytes(512);
// data to digest
instrm = new MemoryStream(data);
byte[] code1;
byte[] code2;
using (StreamDigest sd = new StreamDigest(Digests.Keccak512))
{
sd.Initialize(instrm);
code1 = sd.ComputeHash();
}
using (Keccak512 kc = new Keccak512())
code2 = kc.ComputeHash(data);
// compare the hash codes
if (!Compare.AreEqual(code1, code2))
throw new Exception();
}
