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xor for strings (Python recipe) by Mykola Kharechko
ActiveState Code (http://code.activestate.com/recipes/496970/)

Simple xor for strings

Python, 19 lines
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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

xor for strings

Tags: algorithms

1 comment

parappo cinesi 17 years, 8 months ago  # | flag

Short is better.

from itertools import cycle, izip

def process (ss, key):
    key = cycle(key)
    return ''.join(chr(ord(x) ^ ord(y)) for (x,y) in izip(ss, key))

--
:-)
Created by Mykola Kharechko on Fri, 18 Aug 2006 (PSF)
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