Python基于DES算法加密解密实例
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 fromfunctoolsimportpartial importbase64 classDES(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=lambdat,s:''.join(s[i-1]foriint) __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(lambdahex_bin,s:''.join(hex_bin[w] forwin''.join('%2x'%ord(w)forwins)) ,__hex_bin) __DB=partial(lambdas:''.join(chr(int(s[i:i+8],2))foriinrange(0,len(s),8))) __S=partial(lambdahex_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)]]foriinrange(8)) ,__hex_bin,__s) __F=partial(lambdas,k:''.join('0'ifs[i]==k[i]else'1'foriinrange(len(s)))) __K0=partial(lambdak0,K2,k:map(K2, (k[k0[i]:28]+k[0:k0[i]]+k[k0[i]+28:56]+k[28:k0[i]+28]foriinrange(16))) ,__k0,__K2) __K=partial(lambdaK1,K0,k:K0(K1(k)) ,__K1,__K0) def__init__(self): pass definput_key(self,key,base=10): ifbase==2: pass elifbase==16: key=''.join(self.__class__.__hex_bin[w]forwinkey) 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] foriinrange(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 returnself.__class__.__IP1(r+l) defencode(self,s): a='' s+=''*((8-len(s)%8)%8) foriinrange(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(wifw!=''else'0'forwina) defdecode(self,s): a='' s.lower() foriinrange(0,len(s),16): before=''.join(self.__class__.__hex_bin[s[j]]forjinrange(i,i+16)) after=self.__code(before,self.__k[::-1]) a+=self.__class__.__DB(after) returna.rstrip().decode('utf-8') if__name__=='__main__': d=DES() d.input_key('123456789') s='再来一段中文' a=d.encode(s) printa b=d.decode(a) printb
希望本文所述对大家的Python程序设计有所帮助。