public void TestConstructorWithBadArguments()
{
SymmetricAlgorithm algorithm;
ICryptoTransform transform = null;
try
{
algorithm = New <Aes>();
algorithm.Mode = CipherMode.CBC;
Assert.Throws <ArgumentException>(() => transform = new CounterModeCryptoTransform(New <Aes>(), 0, 0));
algorithm = New <Aes>();
algorithm.Mode = CipherMode.ECB;
algorithm.Padding = PaddingMode.PKCS7;
Assert.Throws <ArgumentException>(() => transform = new CounterModeCryptoTransform(algorithm, 0, 0));
algorithm = New <Aes>();
algorithm.Mode = CipherMode.ECB;
algorithm.Padding = PaddingMode.None;
Assert.DoesNotThrow(() => transform = new CounterModeCryptoTransform(algorithm, 0, 0));
}
finally
{
if (transform != null)
{
transform.Dispose();
}
}
}
public void TestCanReuseTransform()
{
SymmetricAlgorithm algorithm = New <Aes>();
algorithm.Mode = CipherMode.ECB;
algorithm.Padding = PaddingMode.None;
using (ICryptoTransform transform = new CounterModeCryptoTransform(algorithm, 0, 0))
{
Assert.That(transform.CanReuseTransform);
}
}
/// <summary>
/// Sets the encryption keys and starts to encrypt the communication
/// with the module.
/// </summary>
/// <param name="key">Session key.</param>
/// <param name="txNonce">TX nonce used as prefix of the counter block.
/// </param>
/// <param name="rxNonce">RX nonce used as prefix of the counter block.
/// </param>
public void SetEncryptionKeys(byte[] key, byte[] txNonce, byte[] rxNonce)
{
Aes128CounterMode aesEncryption = new Aes128CounterMode(GetCounter(txNonce, 1));
encryptor = (CounterModeCryptoTransform)aesEncryption.CreateEncryptor(key, null);
Aes128CounterMode aesDecryption = new Aes128CounterMode(GetCounter(rxNonce, 1));
decryptor = (CounterModeCryptoTransform)aesDecryption.CreateEncryptor(key, null);
encrypt = true;
}
public void TestTransformBlockWithBadArgument()
{
SymmetricAlgorithm algorithm = New <Aes>();
algorithm.Mode = CipherMode.ECB;
algorithm.Padding = PaddingMode.None;
using (ICryptoTransform transform = new CounterModeCryptoTransform(algorithm, 0, 0))
{
Assert.Throws <ArgumentException>(() => transform.TransformBlock(new byte[transform.InputBlockSize + 1], 0, transform.InputBlockSize + 1, new byte[transform.InputBlockSize + 1], 0));
Assert.DoesNotThrow(() => transform.TransformBlock(new byte[transform.InputBlockSize], 0, transform.InputBlockSize, new byte[transform.InputBlockSize], 0));
}
}
