public static byte[] Blake2(FileStream fileStream, byte[] key)
{
using (var blake2 = new GenericHash.GenericHashAlgorithm(key, Constants.HashLength))
{
return(blake2.ComputeHash(fileStream));
}
}
public void ComputeHashFromBytes()
{
var expected = Utilities.HexToBinary("8866267f985204ae511980704ac85ec4936ee535c37541f342976b2cb3ac62fd");
var hashStream = new GenericHash.GenericHashAlgorithm("This is a test key", 32);
var actual = hashStream.ComputeHash(Encoding.UTF8.GetBytes("Adam Caudill"));
CollectionAssert.AreEqual(expected, actual);
}
public void ComputeHashFromNullStream()
{
var expected = Utilities.HexToBinary("4afd15412c1b940d7cffc9049b9ed413cbaeb626aca2a70c2afbeea7a85bdf8e");
var stream = Stream.Null;
var hashStream = new GenericHash.GenericHashAlgorithm("This is a test key", 32);
var actual = hashStream.ComputeHash(stream);
CollectionAssert.AreEqual(expected, actual);
}
public static byte[] Hash(byte[] payload, byte[] nonce)
{
if (nonce == null)
{
nonce = new byte[24];
using (var random = new RNGCryptoServiceProvider())
random.GetBytes(nonce);
}
var hashAlgorithm = new GenericHash.GenericHashAlgorithm(nonce, 24);
return(hashAlgorithm.ComputeHash(payload));
}
public static Tuple <byte[], byte[]> GenerateClientSessionKeys(KeyPair clientKeys, byte[] serverPublicKey)
{
var junk = new byte[Math.Max(crypto_kx_SESSIONKEYBYTES, clientKeys.PublicKey.Length)];
var clientSecret = ScalarMult.Mult(clientKeys.PrivateKey, serverPublicKey);
using (var clientHash = new GenericHash.GenericHashAlgorithm((byte[])null, 2 * crypto_kx_SESSIONKEYBYTES))
{
clientHash.Initialize();
clientHash.TransformBlock(clientSecret, 0, clientSecret.Length, junk, 0);
clientHash.TransformBlock(clientKeys.PublicKey, 0, clientSecret.Length, junk, 0);
clientHash.TransformFinalBlock(serverPublicKey, 0, clientSecret.Length);
var rx = clientHash.Hash.Take(crypto_kx_SESSIONKEYBYTES);
var tx = clientHash.Hash.Skip(crypto_kx_SESSIONKEYBYTES);
return(Tuple.Create(rx.ToArray(), tx.ToArray()));
}
}
public static byte[] Hash(FileStream fileStream)
{
using var blake2 = new GenericHash.GenericHashAlgorithm(key: (byte[])null, Constants.BLAKE2Length);
return(blake2.ComputeHash(fileStream));
}