public void Oracle()
{
EncryptionOracle eo = new EncryptionOracle();
AESCipherHelper helper = new AESCipherHelper();
for (int i = 0; i < 100; i++)
{
Random r = new Random();
Tuple <Base64, string> encrypted = eo.EncryptWithRandomPadding(new String((char)r.Next(255), 100));
Assert.IsTrue((helper.IsECB(encrypted.Item1.Decode()) && encrypted.Item2 == "EBC") || (encrypted.Item2 == "CBC"));
}
}
public void DetectECB()
{
AESCipherHelper helper = new AESCipherHelper(blockSize);
string expected = "d880619740a8a19b7840a8a31c810a3d08649af70dc06f4fd5d2d69c744cd283e2dd052f6b641dbf9d11b0348542bb5708649af70dc06f4fd5d2d69c744cd2839475c9dfdbc1d46597949d9c7e82bf5a08649af70dc06f4fd5d2d69c744cd28397a93eab8d6aecd566489154789a6b0308649af70dc06f4fd5d2d69c744cd283d403180c98c8f6db1f2a3f9c4040deb0ab51b29933f2c123c58386b06fba186a";
string actual = "";
foreach (string line in File.ReadAllLines(@"TestFiles\AESinECBdetection.txt"))
{
if (helper.IsECB(line))
{
actual = line;
break;
}
}
Assert.AreEqual(expected, actual);
}
public bool IsECB(int blockSize)
{
Base64 encrypted = eo.EncryptConsistentKey(new String('A', blockSize * 8), unknownString);
return(helper.IsECB(encrypted.Decode()));
}