private void CheckTestCase(OcbBlockCipher encCipher, OcbBlockCipher decCipher, string testName,
int macLengthBytes, byte[] P, byte[] C)
{
byte[] tag = Arrays.Copy(C, C.Length - macLengthBytes, macLengthBytes);
{
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)
{
Fail("encryption reported incorrect length: " + testName);
}
if (!AreEqual(C, enc))
{
Fail("incorrect encrypt in: " + testName);
}
if (!AreEqual(tag, encCipher.GetMac()))
{
Fail("getMac() not the same as the appended tag: " + testName);
}
}
{
byte[] dec = new byte[decCipher.GetOutputSize(C.Length)];
int len = decCipher.ProcessBytes(C, 0, C.Length, dec, 0);
len += decCipher.DoFinal(dec, len);
if (dec.Length != len)
{
Fail("decryption reported incorrect length: " + testName);
}
if (!AreEqual(P, dec))
{
Fail("incorrect decrypt in: " + testName);
}
if (!AreEqual(tag, decCipher.GetMac()))
{
Fail("getMac() not the same as the appended tag: " + testName);
}
}
}
private void RunLongerTestCase(int aesKeySize, int tagLen, byte[] expectedOutput)
{
KeyParameter key = new KeyParameter(new byte[aesKeySize / 8]);
byte[] N = new byte[12];
IAeadBlockCipher c1 = new OcbBlockCipher(new AesFastEngine(), new AesFastEngine());
c1.Init(true, new AeadParameters(key, tagLen, N));
IAeadBlockCipher c2 = new OcbBlockCipher(new AesFastEngine(), new AesFastEngine());
long total = 0;
byte[] S = new byte[128];
for (int i = 0; i < 128; ++i)
{
N[11] = (byte)i;
c2.Init(true, new AeadParameters(key, tagLen, N));
total += UpdateCiphers(c1, c2, S, i, true, true);
total += UpdateCiphers(c1, c2, S, i, false, true);
total += UpdateCiphers(c1, c2, S, i, true, false);
}
long expectedTotal = 16256 + (48 * tagLen);
if (total != expectedTotal)
{
Fail("test generated the wrong amount of input: " + total);
}
byte[] output = new byte[c1.GetOutputSize(0)];
c1.DoFinal(output, 0);
if (!AreEqual(expectedOutput, output))
{
Fail("incorrect encrypt in long-form test");
}
}