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：
|
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。