public static void TestInvalidArguments()
{
AesKey key = new AesKey();
AesIV iv = new AesIV();
Assert.Throws<ArgumentNullException>(() =>
{
if (new AesCrypto(null) == null) { }
});
Assert.Throws<ArgumentNullException>(() =>
{
if (new AesCrypto(null, iv, CipherMode.CBC, PaddingMode.None) == null) { }
});
Assert.Throws<ArgumentNullException>(() =>
{
if (new AesCrypto(key, null, CipherMode.CBC, PaddingMode.None) == null) { }
});
Assert.DoesNotThrow(() =>
{
if (new AesCrypto(key, iv, CipherMode.CBC, PaddingMode.None) == null) { }
});
}
public static void TestMethods()
{
AesIV zeroIV = AesIV.Zero;
Assert.That(zeroIV.GetBytes(), Is.EquivalentTo(new byte[16]), "The IV 'zero' should consist of all zeros.");
AesIV iv = new AesIV(new byte[16] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 });
Assert.That(iv.GetBytes(), Is.EquivalentTo(new byte[16] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 }), "An IV specified should consist of just those bytes.");
iv = new AesIV();
Assert.That(iv.GetBytes(), Is.Not.EquivalentTo(new byte[16]), "A random iv will in practice never be all zeros.");
}
/// <summary>
/// Instantiate a transformation
/// </summary>
/// <param name="key">The key</param>
/// <param name="iv">Initial Vector</param>
/// <param name="cipherMode">Mode of operation, typically CBC</param>
/// <param name="paddingMode">Padding mode, typically PCS7</param>
public AesCrypto(AesKey key, AesIV iv, CipherMode cipherMode, PaddingMode paddingMode)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
if (iv == null)
{
throw new ArgumentNullException("iv");
}
_aes = new AesManaged();
_aes.Key = key.GetBytes();
_aes.Mode = cipherMode;
_aes.IV = iv.GetBytes();
_aes.Padding = paddingMode;
}
/// <summary>
/// Instantiate a transformation
/// </summary>
/// <param name="key">The key</param>
/// <param name="iv">Initial Vector</param>
/// <param name="cipherMode">Mode of operation, typically CBC</param>
/// <param name="paddingMode">Padding mode, typically PCS7</param>
public AesCrypto(AesKey key, AesIV iv, CipherMode cipherMode, PaddingMode paddingMode)
{
if (key == null)
{
throw new ArgumentNullException("key");
}
if (iv == null)
{
throw new ArgumentNullException("iv");
}
_aes = new AesManaged();
_aes.Key = key.GetBytes();
_aes.Mode = cipherMode;
_aes.IV = iv.GetBytes();
_aes.Padding = paddingMode;
}
public static void TestDoubleDispose()
{
AesKey key = new AesKey();
AesIV iv = new AesIV();
AesCrypto crypto = new AesCrypto(key, iv, CipherMode.CBC, PaddingMode.None);
crypto.Dispose();
Assert.Throws<ObjectDisposedException>(() =>
{
crypto.CreateDecryptingTransform();
});
crypto.Dispose();
Assert.Throws<ObjectDisposedException>(() =>
{
crypto.CreateDecryptingTransform();
});
}
public static void TestInvalidArguments()
{
AesIV iv = null;
Assert.Throws<ArgumentNullException>(() =>
{
iv = new AesIV(null);
});
Assert.Throws<InternalErrorException>(() =>
{
iv = new AesIV(new byte[0]);
});
Assert.Throws<InternalErrorException>(() =>
{
iv = new AesIV(new byte[32]);
});
// Use the instance to avoid FxCop errors.
Object.Equals(iv, null);
}