private static byte[] DoubleLu(byte[] input)
{
byte[] array = new byte[input.Length];
int num = CMac.ShiftLeft(input, array);
int num2 = (input.Length == 16) ? 135 : 27;
byte[] expr_2D_cp_0 = array;
int expr_2D_cp_1 = input.Length - 1;
expr_2D_cp_0[expr_2D_cp_1] ^= (byte)(num2 >> (1 - num << 3));
return(array);
}
public void Init(ICipherParameters parameters)
{
if (parameters is KeyParameter)
{
this.cipher.Init(true, parameters);
this.L = new byte[this.ZEROES.Length];
this.cipher.ProcessBlock(this.ZEROES, 0, this.L, 0);
this.Lu = CMac.DoubleLu(this.L);
this.Lu2 = CMac.DoubleLu(this.Lu);
}
else if (parameters != null)
{
throw new ArgumentException("CMac mode only permits key to be set.", "parameters");
}
this.Reset();
}
public override void PerformTest()
{
IBlockCipher cipher = new AesFastEngine();
IMac mac = new CMac(cipher, 128);
//128 bytes key
KeyParameter key = new KeyParameter(keyBytes128);
// 0 bytes message - 128 bytes key
mac.Init(key);
mac.BlockUpdate(input0, 0, input0.Length);
byte[] outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k128_m0))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k128_m0) + " got "
+ Hex.ToHexString(outBytes));
}
// 16 bytes message - 128 bytes key
mac.Init(key);
mac.BlockUpdate(input16, 0, input16.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k128_m16))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k128_m16) + " got "
+ Hex.ToHexString(outBytes));
}
// 40 bytes message - 128 bytes key
mac.Init(key);
mac.BlockUpdate(input40, 0, input40.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k128_m40))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k128_m40) + " got "
+ Hex.ToHexString(outBytes));
}
// 64 bytes message - 128 bytes key
mac.Init(key);
mac.BlockUpdate(input64, 0, input64.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k128_m64))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k128_m64) + " got "
+ Hex.ToHexString(outBytes));
}
//192 bytes key
key = new KeyParameter(keyBytes192);
// 0 bytes message - 192 bytes key
mac.Init(key);
mac.BlockUpdate(input0, 0, input0.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k192_m0))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k192_m0) + " got "
+ Hex.ToHexString(outBytes));
}
// 16 bytes message - 192 bytes key
mac.Init(key);
mac.BlockUpdate(input16, 0, input16.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k192_m16))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k192_m16) + " got "
+ Hex.ToHexString(outBytes));
}
// 40 bytes message - 192 bytes key
mac.Init(key);
mac.BlockUpdate(input40, 0, input40.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k192_m40))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k192_m40) + " got "
+ Hex.ToHexString(outBytes));
}
// 64 bytes message - 192 bytes key
mac.Init(key);
mac.BlockUpdate(input64, 0, input64.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k192_m64))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k192_m64) + " got "
+ Hex.ToHexString(outBytes));
}
//256 bytes key
key = new KeyParameter(keyBytes256);
// 0 bytes message - 256 bytes key
mac.Init(key);
mac.BlockUpdate(input0, 0, input0.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k256_m0))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k256_m0) + " got "
+ Hex.ToHexString(outBytes));
}
// 16 bytes message - 256 bytes key
mac.Init(key);
mac.BlockUpdate(input16, 0, input16.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k256_m16))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k256_m16) + " got "
+ Hex.ToHexString(outBytes));
}
// 40 bytes message - 256 bytes key
mac.Init(key);
mac.BlockUpdate(input40, 0, input40.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k256_m40))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k256_m40) + " got "
+ Hex.ToHexString(outBytes));
}
// 64 bytes message - 256 bytes key
mac.Init(key);
mac.BlockUpdate(input64, 0, input64.Length);
outBytes = new byte[16];
mac.DoFinal(outBytes, 0);
if (!AreEqual(outBytes, output_k256_m64))
{
Fail("Failed - expected "
+ Hex.ToHexString(output_k256_m64) + " got "
+ Hex.ToHexString(outBytes));
}
}
private void TestExceptions()
{
try
{
CMac mac = new CMac(new AesEngine());
mac.Init(new ParametersWithIV(new KeyParameter(new byte[16]), new byte[16]));
Fail("CMac does not accept IV");
}
catch(ArgumentException)
{
// Expected
}
}