python 类版本rc4加解密

来源:互联网 发布:数据录入员招聘58同城 编辑:程序博客网 时间:2024/03/29 10:08
# /usr/bin/python# coding=utf-8import sys, os, hashlib, time, base64class rc4:    def __init__(self, public_key=None, ckey_lenth=16):        self.ckey_lenth = ckey_lenth        self.public_key = public_key or 'none_public_key'        key = hashlib.md5(self.public_key).hexdigest()        self.keya = hashlib.md5(key[0:16]).hexdigest()        self.keyb = hashlib.md5(key[16:32]).hexdigest()        self.keyc = ''    def encode(self, string):        self.keyc = hashlib.md5(str(time.time())).hexdigest()[32 - self.ckey_lenth:32]        string = '0000000000' + hashlib.md5(string + self.keyb).hexdigest()[0:16] + string        self.result = ''        self.docrypt(string)        return self.keyc + base64.b64encode(self.result)    def decode(self, string):        self.keyc = string[0:self.ckey_lenth]        string = base64.b64decode(string[self.ckey_lenth:])        self.result = ''        self.docrypt(string)        result = self.result        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    def docrypt(self, string):        string_lenth = len(string)        result = ''        box = list(range(256))        randkey = []        cryptkey = self.keya + hashlib.md5(self.keya + self.keyc).hexdigest()        key_lenth = len(cryptkey)        for i in xrange(255):            randkey.append(ord(cryptkey[i % key_lenth]))        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(string_lenth):            a = j = 0            a = (a + 1) % 256            j = (j + box[a]) % 256            tmp = box[a]            box[a] = box[j]            box[j] = tmp            self.result += chr(ord(string[i]) ^ (box[(box[a] + box[j]) % 256]))if __name__=='__main__':    rc = rc4('nishidahuaidan')    string = 'Hello Python Hello Python Hello Python Hello Python Hello Python Hello Python Hello Python Hello Python Hello Python'    print(string)    str = rc.encode(string)    print(str)    str = rc.decode(str)    print(str)

0 0
原创粉丝点击