Python实现DES加密算法源码例详解，pythondes,本篇为大家提供的是关于P

Python实现DES加密算法源码例详解，pythondes,本篇为大家提供的是关于P

本篇为大家提供的是关于Python实现DES加密算法源码例详解，讲解了DES加密的算法原理及具体加密方法。DES加密Python语言的实现，代码比较长，大家可以拆解来学习。

DES数据加密原理：DES使用一个 56 位的密钥以及附加的 8 位奇偶校验位，每组的第8位作为奇偶校验位，从而产生最大 64 位的分组大小。迭代的分组密码，其中将加密的文本块分成两半。一半应用循环功能，然后将输出与另一半进行“异或”运算...具体加密原理大家可以百度下，这里就不详细介绍了。

Python实现DES加密算法源码例详解，源代码如下：

#coding=utf-8  from functools import partial        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':'01020000','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)  #www.iplaypy.com              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()                  if __name__ == '__main__':          d = DES()          d.input_key('密码8位!')          s = '这是原文\n'          a = d.encode(s)          print a          b = d.decode(a)          print b  

Python实现DES加密算法源码例详解，源码第二部分：

#coding=utf-8  import unittest  from des import DES            class KnownValues(unittest.TestCase):          """"""          __known_values = (('12345678','ABC我们大家','388a9c61849462e20af277ffe6891072'),                  )                def test_encode(self):              des = DES()              for key, before, after in self.__known_values:                  des.input_key(key)                  result = des.encode(before)                  self.assertEqual(after, result)                def test_decode(self):              des = DES()              for key, after, before in self.__known_values:                  des.input_key(key)                  result = des.decode(before)                  self.assertEqual(after, result)            class BadInput(unittest.TestCase):          """"""          __key_inputs = (                  )          def test_input_key(self):              des = DES()              self.assertRaises(IndexError, des.input_key, '1234567', 10)              self.assertRaises(IndexError, des.input_key, '123我阿, 4567', 2)              self.assertRaises(KeyError, des.input_key, '123我哦哦哦, 4567', 16)                def test_encode(self):              pass                def test_decode(self):              des = DES()              self.assertRaises(KeyError, des.decode, '123我哦哦哦, 4567')            class SanityCheck(unittest.TestCase):          """"""          """"""          __encode_inputs = (('asfd我 ','的萨sa1'),                  )          __decode_inputs = (('12345678','388a9c61849462e20af277ffe6891072'),                  )                def test_encode(self):              des = DES()              for key, before in self.__encode_inputs:                  des.input_key(key)                  after = des.encode(before)                  result = des.decode(after)                  self.assertEqual(before, result)                def test_decode(self):              des = DES()              for key, before in self.__decode_inputs:                  des.input_key(key)                  after = des.decode(before)                  result = des.encode(after)                  self.assertEqual(before, result)            if __name__ == '__main__':          unittest.main()  

以上Python源码供参考，如要使用请自行整理后再应用。

编橙之家文章，