python加密->RC4.py

#!/usr/bin/python# -*- coding: utf-8 -*-import sys,os,hashlib,time,base64class RC4:    def __init__(self, keyStr, keyLen=16):        self.keyLen = keyLen        self.keyStr = keyStr or 'none_key'        key = hashlib.md5(self.keyStr).hexdigest()   #32位        self.keya = hashlib.md5(key[0:16]).hexdigest()        self.keyb = hashlib.md5(key[16:32]).hexdigest()        self.keyc = ''    #加密    def encrypt(self, data):        self.keyc = hashlib.md5(str(time.time())).hexdigest()[(32-self.keyLen):32]        data = '0000000000' + hashlib.md5(data + self.keyb).hexdigest()[0:16] + data        result = self.rc4Algorithm(data)        return self.keyc + base64.b64encode(result)    #解密    def decrypt(self, data):        self.keyc = data[0:self.keyLen]        data = base64.b64decode(data[self.keyLen:])        result = self.rc4Algorithm(data)        if (result[0:10] == '0000000000' or int(result[0:10]) - int(time.time()) > 0) and result[10:26] == hashlib.md5(result[26:] + self.keyb).hexdigest()[0:16]:            return result[26:]        else:            return None    #rc4算法实现    def rc4Algorithm(self, data):        dataLen = len(data)        result = ''        box = list(range(256))        randKey = []        cryptKey = self.keya + hashlib.md5(self.keya + self.keyc).hexdigest()        keyLen = len(cryptKey)        for i in xrange(255):            randKey.append(ord(cryptKey[i % keyLen]))        for i in xrange(255):            j = 0            j = (j + box[i] + randKey[i]) % 256            tmp = box[i]            box[i] = box[j]            box[j] = tmp        for i in xrange(dataLen):            a = j = 0            a = (a + 1) % 256            j = (j + box[a]) % 256            tmp = box[a]            box[a] = box[j]            box[j] = tmp            result += chr(ord(data[i]) ^ (box[(box[a] + box[j]) % 256]))        return  result#RC4测试if __name__=='__main__':    rc4 = RC4('jianan')    data = 'hello script, i love python and lua'    print data    str = rc4.encrypt(data)    print str    str = rc4.decrypt(str)    print str# hello script, i love python and lua# e59f7b8e4271a596+DJzDKYfCh9tbh2cP22cMaGDFvGntU58QdR71Rd4dW4BwayP0g8E0IF2PcMPNz9zo9tmi8NhwyZwxSJj4Q==# hello script, i love python and lua