source: products/quintagroup.captcha.core/trunk/quintagroup/captcha/core/Crypto.py @ 2678

# xor implementation with PyCrypto interface

def new(key):
    return Xor(key)

class Xor:
    def __init__(self, key):
        self.__key = key

    def __xor(self, s):
        res = ''
        for i in range(len(s)):
            res += chr(ord(s[i]) ^ ord(self.__key[i]))
        return res

    def __normkey(self, s):
        self.__key = self.__key * (len(s) / len(self.__key))

    def encrypt(self, s):
        self.__normkey(s)
        return self.__xor(s)

    decrypt = encrypt