public void HChaCha20BlockTestVector()
{
// https://tools.ietf.org/html/draft-irtf-cfrg-xchacha-03#section-2.2.1
// Arrange
var key = CryptoBytes.FromHexString("00:01:02:03:04:05:06:07:08:09:0a:0b:0c:0d:0e:0f:10:11:12:13:14:15:16:17:18:19:1a:1b:1c:1d:1e:1f".Replace(":", string.Empty));
var nonce = CryptoBytes.FromHexString("00:00:00:09:00:00:00:4a:00:00:00:00:31:41:59:27".Replace(":", string.Empty));
var cipher = new XChaCha20(key, 0);
// Act
var subKey = new byte[32];
cipher.HChaCha20(subKey, nonce);
var state = subKey.ToUInt16Array();
//var stateHex = CryptoBytes.ToHexStringLower(subKey.ToArray());
// Assert
// HChaCha20 returns only the first and last rows
var expectedState = new uint[]
{
0x423b4182, 0xfe7bb227, 0x50420ed3, 0x737d878a,
//0x0aa76448, 0x7954cdf3, 0x846acd37, 0x7b3c58ad,
//0x77e35583, 0x83e77c12, 0xe0076a2d, 0xbc6cd0e5,
0xd5e4f9a0, 0x53a8748a, 0x13c42ec1, 0xdcecd326
};
// Same as above but in HEX
//var expectedStateHex = "82413b4" + "227b27bfe" + "d30e4250" + "8a877d73"
// + "a0f9e4d" + "58a74a853" + "c12ec413" + "26d3ecdc";
state.Should().BeEquivalentTo(expectedState);
//stateHex.Should().Be(expectedStateHex);
}
public void HChaCha20_computes_key()
{
// From https://trac.tools.ietf.org/html/draft-irtf-cfrg-xchacha-01#section-2.2.1
var key = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f".DecodeHex();
var nonce = "000000090000004a0000000031415927".DecodeHex();
var expected = "82413b4227b27bfed30e42508a877d73a0f9e4d58a74a853c12ec41326d3ecdc".DecodeHex();
var result = new byte[32];
XChaCha20.HChaCha20(key, nonce, result);
Assert.Equal(expected, result);
}
public void HChaCha20TestVectors()
{
// Arrange
foreach (var test in HChaCha20TestVector.HChaCha20TestVectors)
{
var cipher = new XChaCha20(test.Key, 0);
// Act
var output = new byte[Snuffle.KEY_SIZE_IN_BYTES];
cipher.HChaCha20(output, test.Input);
// Assert
output.Should().Equal(test.Output);
}
}
public void HChaCha20TestVectors()
{
// Arrange
foreach (var test in HChaCha20TestVector.HChaCha20TestVectors)
{
var cipher = new XChaCha20(test.Key, 0);
// Act
var output = cipher.HChaCha20(test.Input);
// Assert
//Assert.That(output, Is.EqualTo(test.Output));
Assert.IsTrue(CryptoBytes.ConstantTimeEquals(test.Output, output));
}
}
