public void TestRandomBytes(int?numBytes)
{
byte[] cryptoKey, authKey;
SymmetricAuthenticated_AES_HMACSHA256.GenerateKeys(out cryptoKey, out authKey);
byte[] input = null;
if (numBytes.HasValue)
{
input = GetRandomBytes(numBytes.Value, numBytes.Value);
}
byte[] encrypted, decrypted;
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
encrypted = algorithm.EncryptBytes(input, cryptoKey, authKey);
}
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
decrypted = algorithm.DecryptBytes(encrypted, cryptoKey, authKey);
}
if (input == null)
{
Assert.IsNull(encrypted, "encrypted");
Assert.IsNull(decrypted, "decrypted");
}
else
{
Assert.IsTrue(encrypted.Length >= numBytes, "encrypted.Length");
Assert.IsTrue(decrypted.SequenceEqual(input), "Decrypted does not match original.");
}
}
public void TestIncorrectKeyFails()
{
byte[] cryptoKey, authKey;
SymmetricAuthenticated_AES_HMACSHA256.GenerateKeys(out cryptoKey, out authKey);
byte[] input = GetRandomBytes(1000, 5000);
byte[] encrypted;
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
encrypted = algorithm.EncryptBytes(input, cryptoKey, authKey);
}
SymmetricAuthenticated_AES_HMACSHA256.GenerateKeys(out cryptoKey, out authKey);
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
algorithm.DecryptBytes(encrypted, cryptoKey, authKey);
}
}
public void TestUnicodeString()
{
byte[] cryptoKey, authKey;
SymmetricAuthenticated_AES_HMACSHA256.GenerateKeys(out cryptoKey, out authKey);
string input = Convert.ToBase64String(SecureRandomizer.GetRandomBytes(100)) + "\u01e2\u01f0\u020e\u0229";
byte[] encrypted;
string decrypted;
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
encrypted = algorithm.EncryptString(input, cryptoKey, authKey);
}
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
Assert.IsTrue(encrypted.Length > 100, "encrypted.Length");
decrypted = algorithm.DecryptBytes(encrypted, cryptoKey, authKey).AsString();
}
Assert.AreEqual(input, decrypted, string.Format("{0} | {1}", input, decrypted));
}
public void TestInvalidAuthentication()
{
byte[] cryptoKey, authKey;
SymmetricAuthenticated_AES_HMACSHA256.GenerateKeys(out cryptoKey, out authKey);
byte[] input = GetRandomBytes(500, 1000);
byte[] encrypted, decrypted;
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
encrypted = algorithm.EncryptBytes(input, cryptoKey, authKey);
}
// Change the last byte in the file, which is the
encrypted[encrypted.GetUpperBound(0)] = (byte)(~encrypted[encrypted.GetUpperBound(0)]);
using (var algorithm = new SymmetricAuthenticated_AES_HMACSHA256())
{
decrypted = algorithm.DecryptBytes(encrypted, cryptoKey, authKey);
}
Assert.IsTrue(decrypted.SequenceEqual(input), "Decrypted does not match original.");
}
