public void ShouldComputeProperIValueFromInteger(int dataUnitSeqNumber, string hex)
{
var expectedBitString = new BitString(hex);
var result = XtsHelper.GetIFromInteger(dataUnitSeqNumber);
Assert.AreEqual(expectedBitString, result);
}
public void ShouldGetCAVSFileRight(int length, string ptHex, string keyHex, int seqNum, string ctHex)
{
var key = new BitString(keyHex);
var tweak = XtsHelper.GetIFromInteger(seqNum);
var pt = new BitString(ptHex, length);
var ct = new BitString(ctHex, length);
var subject = new XtsBlockCipher(new AesEngine());
var encryptResult = subject.ProcessPayload(new XtsModeBlockCipherParameters(BlockCipherDirections.Encrypt, tweak, key, pt, pt.BitLength));
Assert.IsTrue(encryptResult.Success, $"encryption failed, {encryptResult.ErrorMessage}");
Assert.AreEqual(ct.ToHex(), encryptResult.Result.ToHex(), "encrypt comparison");
var decryptResult = subject.ProcessPayload(new XtsModeBlockCipherParameters(BlockCipherDirections.Decrypt, tweak, key, ct, ct.BitLength));
Assert.IsTrue(decryptResult.Success, $"decryption failed, {decryptResult.ErrorMessage}");
Assert.AreEqual(pt.ToHex(), decryptResult.Result.ToHex(), "decrypt comparison");
}