test_DES.py 文件源码

def runTest(self):
        from Crypto.Cipher import DES
        from binascii import b2a_hex

        X = []
        X[0:] = [b('\x94\x74\xB8\xE8\xC7\x3B\xCA\x7D')]

        for i in range(16):
            c = DES.new(X[i],DES.MODE_ECB)
            if not (i&1): # (num&1) returns 1 for odd numbers 
                X[i+1:] = [c.encrypt(X[i])] # even
            else:
                X[i+1:] = [c.decrypt(X[i])] # odd

        self.assertEqual(b2a_hex(X[16]),
            b2a_hex(b('\x1B\x1A\x2D\xDB\x4C\x64\x24\x38')))