public void CreateDecryptorInvalid()
{
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
Assert.Throws<ArgumentNullException>(() => salsa20.CreateDecryptor(null, new byte[8]));
Assert.Throws<ArgumentNullException>(() => salsa20.CreateDecryptor(new byte[16], null));
Assert.Throws<CryptographicException>(() => salsa20.CreateDecryptor(new byte[15], new byte[8]));
Assert.Throws<CryptographicException>(() => salsa20.CreateDecryptor(new byte[16], new byte[7]));
}
}
public void EncryptDecrypt()
{
// generate data to encrypt
byte[] input;
using (MemoryStream stream = new MemoryStream())
using (BinaryWriter writer = new BinaryWriter(stream))
{
for (short value = -1024; value <= 1023; value++)
writer.Write(value);
writer.Flush();
input = stream.ToArray();
}
using (SymmetricAlgorithm salsa20 = new Salsa20())
{
byte[] encrypted = new byte[input.Length];
using (ICryptoTransform encrypt = salsa20.CreateEncryptor())
encrypt.TransformBlock(input, 0, input.Length, encrypted, 0);
byte[] decrypted = new byte[input.Length];
using (ICryptoTransform decrypt = salsa20.CreateDecryptor())
decrypt.TransformBlock(encrypted, 0, encrypted.Length, decrypted, 0);
CollectionAssert.AreEqual(input, decrypted);
}
}