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：
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 #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。
