public void Test_Decrypt_WithAdditionalData_Success()
{
using (var key = XChaChaKey.Generate())
{
var aeadCipher = new XChaChaAeadCipher();
var nonce = XChaChaNonce.Generate();
var additionalData = Encoding.UTF8.GetBytes(DateTime.Now.ToString());
const int messageLength = 1024 * 1024;
var message = RandomBytesGenerator.NextBytes(messageLength);
var ciphertext = aeadCipher.Encrypt(message, key, nonce, additionalData);
var result = aeadCipher.Decrypt(ciphertext, key, nonce, additionalData);
Assert.Equal(message, result);
}
}
public void Test_Decrypt_WithInvalidAdditionalData_Fails()
{
using (var key = XChaChaKey.Generate())
{
var aeadCipher = new XChaChaAeadCipher();
var nonce = XChaChaNonce.Generate().ToArray();
var additionalData = Encoding.UTF8.GetBytes(DateTime.Now.ToString());
const int messageLength = 1024 * 1024;
var message = RandomBytesGenerator.NextBytes(messageLength);
var ciphertext = aeadCipher.Encrypt(message, key, new XChaChaNonce(nonce), additionalData);
var invalidAdditionalData = Encoding.UTF8.GetBytes("banana");
Action action = () => { aeadCipher.Decrypt(ciphertext, key, new XChaChaNonce(nonce), invalidAdditionalData); };
var exception = Assert.Throws <CryptographicException>(action);
Assert.Equal("decryption failed", exception.Message);
}
}
