private void randomTest(
SecureRandom srng,
IGcmMultiplier m)
{
int kLength = 16 + 8 * srng.Next(3);
byte[] K = new byte[kLength];
srng.NextBytes(K);
int pLength = srng.Next(1024);
byte[] P = new byte[pLength];
srng.NextBytes(P);
int aLength = srng.Next(1024);
byte[] A = new byte[aLength];
srng.NextBytes(A);
int ivLength = 1 + srng.Next(1024);
byte[] IV = new byte[ivLength];
srng.NextBytes(IV);
GcmBlockCipher cipher = new GcmBlockCipher(new AesFastEngine(), m);
AeadParameters parameters = new AeadParameters(new KeyParameter(K), 16 * 8, IV, A);
cipher.Init(true, parameters);
byte[] C = new byte[cipher.GetOutputSize(P.Length)];
int len = cipher.ProcessBytes(P, 0, P.Length, C, 0);
len += cipher.DoFinal(C, len);
if (C.Length != len)
{
// Console.WriteLine("" + C.Length + "/" + len);
Fail("encryption reported incorrect length in randomised test");
}
byte[] encT = cipher.GetMac();
byte[] tail = new byte[C.Length - P.Length];
Array.Copy(C, P.Length, tail, 0, tail.Length);
if (!AreEqual(encT, tail))
{
Fail("stream contained wrong mac in randomised test");
}
cipher.Init(false, parameters);
byte[] decP = new byte[cipher.GetOutputSize(C.Length)];
len = cipher.ProcessBytes(C, 0, C.Length, decP, 0);
len += cipher.DoFinal(decP, len);
if (!AreEqual(P, decP))
{
Fail("incorrect decrypt in randomised test");
}
byte[] decT = cipher.GetMac();
if (!AreEqual(encT, decT))
{
Fail("decryption produced different mac from encryption");
}
}
private void checkTestCase(
GcmBlockCipher encCipher,
GcmBlockCipher decCipher,
string testName,
byte[] P,
byte[] C,
byte[] T)
{
byte[] enc = new byte[encCipher.GetOutputSize(P.Length)];
int len = encCipher.ProcessBytes(P, 0, P.Length, enc, 0);
len += encCipher.DoFinal(enc, len);
if (enc.Length != len)
{
// Console.WriteLine("" + enc.Length + "/" + len);
Fail("encryption reported incorrect length: " + testName);
}
byte[] mac = encCipher.GetMac();
byte[] data = new byte[P.Length];
Array.Copy(enc, data, data.Length);
byte[] tail = new byte[enc.Length - P.Length];
Array.Copy(enc, P.Length, tail, 0, tail.Length);
if (!AreEqual(C, data))
{
Fail("incorrect encrypt in: " + testName);
}
if (!AreEqual(T, mac))
{
Fail("GetMac() returned wrong mac in: " + testName);
}
if (!AreEqual(T, tail))
{
Fail("stream contained wrong mac in: " + testName);
}
byte[] dec = new byte[decCipher.GetOutputSize(enc.Length)];
len = decCipher.ProcessBytes(enc, 0, enc.Length, dec, 0);
len += decCipher.DoFinal(dec, len);
mac = decCipher.GetMac();
data = new byte[C.Length];
Array.Copy(dec, data, data.Length);
if (!AreEqual(P, data))
{
Fail("incorrect decrypt in: " + testName);
}
}
