public void EncryptDecryptLongMessagesWithNonceTest()
{
var rnd = new Random();
var dataSize = 16;
while (dataSize <= (1 << 24))
{
var plaintext = new byte[dataSize];
rnd.NextBytes(plaintext);
var key = new byte[Snuffle.KEY_SIZE_IN_BYTES];
rnd.NextBytes(key);
var cipher = new XChaCha20(key, 0);
var nonce = new byte[cipher.NonceSizeInBytes()];
rnd.NextBytes(nonce);
var ciphertext = cipher.Encrypt(plaintext, nonce);
var decrypted = cipher.Decrypt(ciphertext, nonce);
//Assert.AreEqual(plaintext, decrypted);
Assert.IsTrue(CryptoBytes.ConstantTimeEquals(plaintext, decrypted));
dataSize += 5 * dataSize / 11;
}
}
public void XChaCha20BlockWhenLengthIsInvalidFails()
{
// Arrange
var key = new byte[Snuffle.KEY_SIZE_IN_BYTES];
var cipher = new XChaCha20(key, 0);
var nonce = new byte[cipher.NonceSizeInBytes() + TestHelpers.ReturnRandomPositiveNegative()];
var block = new byte[0];
// Act & Assert
Assert.Throws <CryptographicException>(() => cipher.ProcessKeyStreamBlock(nonce, 0, block));
}
public void DecryptWhenNonceLengthIsInvalidFails()
{
// Arrange
var cipher = new XChaCha20(new byte[Snuffle.KEY_SIZE_IN_BYTES], 0);
// Act & Assert
Assert.Throws <CryptographicException>(() => cipher.Decrypt(new byte[0], new byte[cipher.NonceSizeInBytes() + TestHelpers.ReturnRandomPositiveNegative()]), EXCEPTION_MESSAGE_NONCE_LENGTH);
}