Python基于DES算法加密解密实例


Posted in Python onJune 03, 2015

本文实例讲述了Python基于DES算法加密解密实现方法。分享给大家供大家参考。具体实现方法如下:

#coding=utf-8  
from functools import partial  
import base64 
class DES(object):  
  """ 
  DES加密算法 
  interface: input_key(s, base=10), encode(s), decode(s) 
  """  
  __ip = [  
    58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,  
    62,54,46,38,30,22,14,6,64,56,48,40,32,24,16,8,  
    57,49,41,33,25,17, 9,1,59,51,43,35,27,19,11,3,  
    61,53,45,37,29,21,13,5,63,55,47,39,31,23,15,7,  
  ]  
  __ip1 = [  
    40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,  
    38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,  
    36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,  
    34,2,42,10,50,18,58,26,33,1,41, 9,49,17,57,25,  
  ]  
  __e = [  
    32, 1, 2, 3, 4, 5,  
    4 , 5, 6, 7, 8, 9,  
    8 , 9,10,11,12,13,  
    12,13,14,15,16,17,  
    16,17,18,19,20,21,  
    20,21,22,23,24,25,  
    24,25,26,27,28,29,  
    28,29,30,31,32, 1,  
  ]  
  __p = [  
    16, 7,20,21,29,12,28,17,  
    1 ,15,23,26, 5,18,31,10,  
    2 ,8 ,24,14,32,27, 3, 9,  
    19,13,30, 6,22,11, 4,25,  
  ]  
  __s = [  
    [  
    0xe,0x4,0xd,0x1,0x2,0xf,0xb,0x8,0x3,0xa,0x6,0xc,0x5,0x9,0x0,0x7,
    0x0,0xf,0x7,0x4,0xe,0x2,0xd,0x1,0xa,0x6,0xc,0xb,0x9,0x5,0x3,0x8,
    0x4,0x1,0xe,0x8,0xd,0x6,0x2,0xb,0xf,0xc,0x9,0x7,0x3,0xa,0x5,0x0,
    0xf,0xc,0x8,0x2,0x4,0x9,0x1,0x7,0x5,0xb,0x3,0xe,0xa,0x0,0x6,0xd,
    ],  
    [  
    0xf,0x1,0x8,0xe,0x6,0xb,0x3,0x4,0x9,0x7,0x2,0xd,0xc,0x0,0x5,0xa,
    0x3,0xd,0x4,0x7,0xf,0x2,0x8,0xe,0xc,0x0,0x1,0xa,0x6,0x9,0xb,0x5,
    0x0,0xe,0x7,0xb,0xa,0x4,0xd,0x1,0x5,0x8,0xc,0x6,0x9,0x3,0x2,0xf,
    0xd,0x8,0xa,0x1,0x3,0xf,0x4,0x2,0xb,0x6,0x7,0xc,0x0,0x5,0xe,0x9,
    ],  
    [  
    0xa,0x0,0x9,0xe,0x6,0x3,0xf,0x5,0x1,0xd,0xc,0x7,0xb,0x4,0x2,0x8,
    0xd,0x7,0x0,0x9,0x3,0x4,0x6,0xa,0x2,0x8,0x5,0xe,0xc,0xb,0xf,0x1,
    0xd,0x6,0x4,0x9,0x8,0xf,0x3,0x0,0xb,0x1,0x2,0xc,0x5,0xa,0xe,0x7,
    0x1,0xa,0xd,0x0,0x6,0x9,0x8,0x7,0x4,0xf,0xe,0x3,0xb,0x5,0x2,0xc,
    ],  
    [  
    0x7,0xd,0xe,0x3,0x0,0x6,0x9,0xa,0x1,0x2,0x8,0x5,0xb,0xc,0x4,0xf,
    0xd,0x8,0xb,0x5,0x6,0xf,0x0,0x3,0x4,0x7,0x2,0xc,0x1,0xa,0xe,0x9,
    0xa,0x6,0x9,0x0,0xc,0xb,0x7,0xd,0xf,0x1,0x3,0xe,0x5,0x2,0x8,0x4,
    0x3,0xf,0x0,0x6,0xa,0x1,0xd,0x8,0x9,0x4,0x5,0xb,0xc,0x7,0x2,0xe,
    ],  
    [  
    0x2,0xc,0x4,0x1,0x7,0xa,0xb,0x6,0x8,0x5,0x3,0xf,0xd,0x0,0xe,0x9,
    0xe,0xb,0x2,0xc,0x4,0x7,0xd,0x1,0x5,0x0,0xf,0xa,0x3,0x9,0x8,0x6,
    0x4,0x2,0x1,0xb,0xa,0xd,0x7,0x8,0xf,0x9,0xc,0x5,0x6,0x3,0x0,0xe,
    0xb,0x8,0xc,0x7,0x1,0xe,0x2,0xd,0x6,0xf,0x0,0x9,0xa,0x4,0x5,0x3,
    ],  
    [  
    0xc,0x1,0xa,0xf,0x9,0x2,0x6,0x8,0x0,0xd,0x3,0x4,0xe,0x7,0x5,0xb,
    0xa,0xf,0x4,0x2,0x7,0xc,0x9,0x5,0x6,0x1,0xd,0xe,0x0,0xb,0x3,0x8,
    0x9,0xe,0xf,0x5,0x2,0x8,0xc,0x3,0x7,0x0,0x4,0xa,0x1,0xd,0xb,0x6,
    0x4,0x3,0x2,0xc,0x9,0x5,0xf,0xa,0xb,0xe,0x1,0x7,0x6,0x0,0x8,0xd,
    ],  
    [  
    0x4,0xb,0x2,0xe,0xf,0x0,0x8,0xd,0x3,0xc,0x9,0x7,0x5,0xa,0x6,0x1,
    0xd,0x0,0xb,0x7,0x4,0x9,0x1,0xa,0xe,0x3,0x5,0xc,0x2,0xf,0x8,0x6,
    0x1,0x4,0xb,0xd,0xc,0x3,0x7,0xe,0xa,0xf,0x6,0x8,0x0,0x5,0x9,0x2,
    0x6,0xb,0xd,0x8,0x1,0x4,0xa,0x7,0x9,0x5,0x0,0xf,0xe,0x2,0x3,0xc,
    ],  
    [  
    0xd,0x2,0x8,0x4,0x6,0xf,0xb,0x1,0xa,0x9,0x3,0xe,0x5,0x0,0xc,0x7,
    0x1,0xf,0xd,0x8,0xa,0x3,0x7,0x4,0xc,0x5,0x6,0xb,0x0,0xe,0x9,0x2,
    0x7,0xb,0x4,0x1,0x9,0xc,0xe,0x2,0x0,0x6,0xa,0xd,0xf,0x3,0x5,0x8,
    0x2,0x1,0xe,0x7,0x4,0xa,0x8,0xd,0xf,0xc,0x9,0x0,0x3,0x5,0x6,0xb,
    ],  
  ]  
  __k1 = [  
    57,49,41,33,25,17, 9,  
    1 ,58,50,42,34,26,18,  
    10, 2,59,51,43,35,27,  
    19,11, 3,60,52,44,36,  
    63,55,47,39,31,23,15,  
    7 ,62,54,46,38,30,22,  
    14, 6,61,53,45,37,29,  
    21,13, 5,28,20,12, 4,  
  ]  
  __k2 = [  
    14,17,11,24, 1, 5, 3,28,  
    15, 6,21,10,23,19,12, 4,  
    26, 8,16, 7,27,20,13, 2,  
    41,52,31,37,47,55,30,40,  
    51,45,33,48,44,49,39,56,  
    34,53,46,42,50,36,29,32,  
  ]  
  __k0 = [  
    1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1,  
  ]  
  __hex_bin = {  
    '0':'0000','1':'0001','2':'0010','3':'0011',  
    '4':'0100','5':'0101','6':'0110','7':'0111',  
    '8':'1000','9':'1001','a':'1010','b':'1011',  
    'c':'1100','d':'1101','e':'1110','f':'1111',  
    ' ':'0000'  
  }  
  __re = lambda t, s: ''.join(s[i-1] for i in t)  
  __IP = partial(__re, __ip)  
  __IP1 = partial(__re, __ip1)  
  __E = partial(__re, __e)  
  __P = partial(__re, __p)  
  __K1 = partial(__re, __k1)  
  __K2 = partial(__re, __k2)  
  __B = partial( lambda hex_bin, s: ''.join(hex_bin[w]  
    for w in ''.join('%2x' % ord(w) for w in s))  
    , __hex_bin)  
  __DB = partial( lambda s: ''.join(chr(int(s[i:i+8], 2)) for i in range(0, len(s), 8)))  
  __S = partial( lambda hex_bin, __s, s: ''.join(hex_bin['%x' % __s[i][  
    int(s[i*6]+s[i*6+5], 2)*16 + int(s[i*6+1:i*6+5], 2)]] for i in range(8))  
    , __hex_bin, __s)  
  __F = partial( lambda s, k: ''.join('0' if s[i]==k[i] else '1' for i in range(len(s))))  
  __K0 = partial( lambda k0, K2, k: map(K2,  
    (k[k0[i]:28]+k[0:k0[i]] + k[k0[i]+28:56]+k[28:k0[i]+28] for i in range(16)))  
    , __k0, __K2)  
  __K = partial( lambda K1, K0, k: K0(K1(k))  
    , __K1, __K0)  
  def __init__(self):  
    pass  
  def input_key(self, key, base=10):  
    if base == 2:  
      pass  
    elif base == 16:  
      key = ''.join(self.__class__.__hex_bin[w] for w in key)  
    else:  
      key = self.__class__.__B(key)  
    self.__k = self.__class__.__K(key)  
  def __code(self, s, k):  
    s = self.__IP(s)  
    l, r = s[0:32], s[32:64]  
    for i in range(16):  
      r_t = r  
      r = self.__E(r)  
      r = self.__F(r, k[i])  
      r = self.__S(r)  
      r = self.__P(r)  
      r = self.__F(r, l)  
      l = r_t  
    return self.__class__.__IP1(r+l)  
  def encode(self, s):  
    a = ''  
    s += ' ' * ((8-len(s)%8)%8)  
    for i in range(0, len(s), 8):  
      before = self.__class__.__B(s[i:i+8])  
      after = self.__code(before, self.__k)  
      a += '%16x' % int(after, 2)  
    return ''.join(w if w!=' ' else '0' for w in a)  
  def decode(self, s):  
    a = ''  
    s.lower()  
    for i in range(0, len(s), 16):  
      before = ''.join(self.__class__.__hex_bin[s[j]] for j in range(i, i+16))  
      after = self.__code(before, self.__k[::-1])  
      a += self.__class__.__DB(after)  
    return a.rstrip().decode('utf-8')  
if __name__ == '__main__':  
  d = DES()  
  d.input_key('123456789')  
  s = '再来一段中文'  
  a = d.encode(s)  
  print a 
  b = d.decode(a) 
  print b

希望本文所述对大家的Python程序设计有所帮助。

Python 相关文章推荐
讲解Python中运算符使用时的优先级
May 14 Python
Python面向对象之类的内置attr属性示例
Dec 14 Python
使用Python3+PyQT5+Pyserial 实现简单的串口工具方法
Feb 13 Python
python3中property使用方法详解
Apr 23 Python
python的移位操作实现详解
Aug 21 Python
Python的条件锁与事件共享详解
Sep 12 Python
django中使用事务及接入支付宝支付功能
Sep 15 Python
Django中的AutoField字段使用
May 18 Python
Python Tkinter实例——模拟掷骰子
Oct 24 Python
15个Pythonic的代码示例(值得收藏)
Oct 29 Python
python基于爬虫+django,打造个性化API接口
Jan 21 Python
python 基于DDT实现数据驱动测试
Feb 18 Python
Python使用minidom读写xml的方法
Jun 03 #Python
Python实现程序的单一实例用法分析
Jun 03 #Python
python简单获取本机计算机名和IP地址的方法
Jun 03 #Python
Python自动调用IE打开某个网站的方法
Jun 03 #Python
Python找出文件中使用率最高的汉字实例详解
Jun 03 #Python
Python实现Windows上气泡提醒效果的方法
Jun 03 #Python
Python捕捉和模拟鼠标事件的方法
Jun 03 #Python
You might like
PHP自定义大小验证码的方法详解
2013/06/07 PHP
利用php+mcDropdown实现文件路径可在下拉框选择
2013/08/07 PHP
php读取csv实现csv文件下载功能
2013/12/18 PHP
学习php设计模式 php实现模板方法模式
2015/12/08 PHP
PHP编写daemon process详解及实例代码
2016/09/30 PHP
Yii核心验证器api详解
2016/11/23 PHP
PHP设计模式之状态模式定义与用法详解
2018/04/02 PHP
PHP 观察者模式深入理解与应用分析
2019/09/25 PHP
写出更好的JavaScript程序之undefined篇(中)
2009/11/23 Javascript
Javascript Cookie读写删除操作的函数
2010/03/02 Javascript
jquery限制输入字数,并提示剩余字数实现代码
2012/12/24 Javascript
JavaScript indexOf方法入门实例(计算指定字符在字符串中首次出现的位置)
2014/10/17 Javascript
JS实现网页标题随机显示名人名言的方法
2015/11/03 Javascript
JavaScript判断变量是否为数组的方法(Array)
2016/02/24 Javascript
javascript简单写的判断电话号码实例
2017/05/24 Javascript
webpack打包js的方法
2018/03/12 Javascript
nodejs中使用archive压缩文件的实现代码
2019/11/26 NodeJs
[03:38]TI4西雅图DOTA2前线报道 71专访
2014/07/08 DOTA
[34:47]完美世界DOTA2联赛PWL S2 Magma vs LBZS 第一场 11.18
2020/11/18 DOTA
Django框架中render_to_response()函数的使用方法
2015/07/16 Python
python通过getopt模块如何获取执行的命令参数详解
2017/12/29 Python
Python自定义线程类简单示例
2018/03/23 Python
Python元组拆包和具名元组解析实例详解
2018/03/26 Python
使用python实现http及ftp服务进行数据传输的方法
2018/10/26 Python
python redis 删除key脚本的实例
2019/02/19 Python
python 提取文件指定列的方法示例
2019/08/07 Python
英国著名的小众美容品牌网站:Alyaka
2017/08/08 全球购物
Becextech新西兰:数码单反相机和手机在线商店
2018/04/27 全球购物
社区七一党员活动方案
2014/01/25 职场文书
大宝sod蜜广告词
2014/03/21 职场文书
小学模范班主任事迹材料
2014/05/13 职场文书
英语教师自荐信
2014/05/26 职场文书
护士2015年终工作总结
2015/04/29 职场文书
市直属机关2016年主题党日活动总结
2016/04/05 职场文书
浅谈Python项目的服务器部署
2021/04/25 Python
JavaScript实现队列结构过程
2021/12/06 Javascript