| public Init ( bool forEncryption, ICipherParameters parameters ) : void | ||
| forEncryption | bool | |
| parameters | ICipherParameters | |
| return | void | |
private void randomTest(
SecureRandom srng)
{
int DAT_LEN = srng.Next(1024);
byte[] nonce = new byte[NONCE_LEN];
byte[] authen = new byte[AUTHEN_LEN];
byte[] datIn = new byte[DAT_LEN];
byte[] key = new byte[16];
srng.NextBytes(nonce);
srng.NextBytes(authen);
srng.NextBytes(datIn);
srng.NextBytes(key);
AesFastEngine engine = new AesFastEngine();
KeyParameter sessKey = new KeyParameter(key);
EaxBlockCipher eaxCipher = new EaxBlockCipher(engine);
AeadParameters parameters = new AeadParameters(sessKey, MAC_LEN * 8, nonce, authen);
eaxCipher.Init(true, parameters);
byte[] intrDat = new byte[eaxCipher.GetOutputSize(datIn.Length)];
int outOff = eaxCipher.ProcessBytes(datIn, 0, DAT_LEN, intrDat, 0);
outOff += eaxCipher.DoFinal(intrDat, outOff);
eaxCipher.Init(false, parameters);
byte[] datOut = new byte[eaxCipher.GetOutputSize(outOff)];
int resultLen = eaxCipher.ProcessBytes(intrDat, 0, outOff, datOut, 0);
eaxCipher.DoFinal(datOut, resultLen);
if (!AreEqual(datIn, datOut))
{
Fail("EAX roundtrip failed to match");
}
}
private void checkVectors(
int count,
string additionalDataType,
byte[] k,
int macSize,
byte[] n,
byte[] a,
byte[] sa,
byte[] p,
byte[] t,
byte[] c)
{
EaxBlockCipher encEax = new EaxBlockCipher(new AesFastEngine());
EaxBlockCipher decEax = new EaxBlockCipher(new AesFastEngine());
AeadParameters parameters = new AeadParameters(new KeyParameter(k), macSize, n, a);
encEax.Init(true, parameters);
decEax.Init(false, parameters);
runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
// key reuse test
parameters = new AeadParameters(null, macSize, n, a);
encEax.Init(true, parameters);
decEax.Init(false, parameters);
runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
runCheckVectors(count, encEax, decEax, additionalDataType, sa, p, t, c);
}
private void checkVectors(
int count,
byte[] k,
int macSize,
byte[] n,
byte[] a,
byte[] p,
byte[] t,
byte[] c)
{
EaxBlockCipher encEax = new EaxBlockCipher(new AesFastEngine());
EaxBlockCipher decEax = new EaxBlockCipher(new AesFastEngine());
AeadParameters parameters = new AeadParameters(new KeyParameter(k), macSize, n, a);
encEax.Init(true, parameters);
decEax.Init(false, parameters);
runCheckVectors(count, encEax, decEax, p, t, c);
runCheckVectors(count, encEax, decEax, p, t, c);
}
public override void PerformTest()
{
checkVectors(1, K1, 128, N1, A1, P1, T1, C1);
checkVectors(2, K2, 128, N2, A2, P2, T2, C2);
checkVectors(3, K3, 128, N3, A3, P3, T3, C3);
checkVectors(4, K4, 128, N4, A4, P4, T4, C4);
checkVectors(5, K5, 128, N5, A5, P5, T5, C5);
checkVectors(6, K6, 128, N6, A6, P6, T6, C6);
checkVectors(7, K7, 128, N7, A7, P7, T7, C7);
checkVectors(8, K8, 128, N8, A8, P8, T8, C8);
checkVectors(9, K9, 128, N9, A9, P9, T9, C9);
checkVectors(10, K10, 128, N10, A10, P10, T10, C10);
checkVectors(11, K11, 32, N11, A11, P11, T11, C11);
EaxBlockCipher eax = new EaxBlockCipher(new AesEngine());
ivParamTest(1, eax, K1, N1);
//
// exception tests
//
try
{
eax.Init(false, new AeadParameters(new KeyParameter(K1), 32, N2, A2));
byte[] enc = new byte[C2.Length];
int len = eax.ProcessBytes(C2, 0, C2.Length, enc, 0);
len += eax.DoFinal(enc, len);
Fail("invalid cipher text not picked up");
}
catch (InvalidCipherTextException)
{
// expected
}
try
{
eax.Init(false, new KeyParameter(K1));
Fail("illegal argument not picked up");
}
catch (ArgumentException)
{
// expected
}
randomTests();
}
private void DoEax(byte[] key, byte[] iv, byte[] pt, byte[] aad, int tagLength, byte[] expected)
{
EaxBlockCipher c = new EaxBlockCipher(new SerpentEngine());
c.Init(true, new AeadParameters(new KeyParameter(key), tagLength, iv, aad));
byte[] output = new byte[expected.Length];
int len = c.ProcessBytes(pt, 0, pt.Length, output, 0);
c.DoFinal(output, len);
if (!Arrays.AreEqual(expected, output))
{
Fail("EAX test failed");
}
}