概述
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 = [ 40,58,] __e = [ 32,] __p = [ 16,] __s = [ [ 0xe,0x4,0xd,0x1,0x2,0xf,0xb,0x8,0x3,0xa,0x6,0xc,0x5,0x9,0x0,0x7,0xe,],[ 0xf,[ 0xa,[ 0x7,[ 0x2,[ 0xc,[ 0x4,[ 0xd,] __k1 = [ 57,] __k2 = [ 14,] __k0 = [ 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(0,8): 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(0,16): 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。
总结
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