S-DES python实现

link管理

链接快照平台

输入网页链接，自动生成快照
标签化管理网页链接

相关文章推荐

飘逸的茄子 · C# ...· 2 月前 ·

千杯不醉的瀑布 · 秘密研究所-秘密导航地址官方发布-入口加载地址页· 3 月前 ·

闯红灯的煎鸡蛋 · [OL][魏传] 三国杀武将列传 ...· 6 月前 ·

挂过科的甜瓜 · 填补空白！千亿参数APUS-xDAN ...· 7 月前 ·

文质彬彬的海豚 · 四川省文化和旅游厅· 7 月前 ·

def IP ( self , text : str ) -> str : orderIP = '15203746' return '' . join ([ text [ int ( i )] for i in orderIP ]) def IP_RE ( self , text : str ) -> str : orderIP_RE = '30246175' return '' . join ([ text [ int ( i )] for i in orderIP_RE ]) def SW ( self , text : str ) -> str : return text [ 4 :] + text [: 4 ] def generateKey ( self , P10 : str ) -> tuple : 用10位密钥产生两位8位密钥 :param P10: 10位密钥, str :return: 2个8位密钥, tuple, (K1,K2) # 置换P10 order10 = '2416390875' P10 = '' . join ([ P10 [ int ( i )] for i in order10 ]) P10 = P10 [ 1 : 5 ] + P10 [ 0 ] + P10 [ 6 :] + P10 [ 5 ] # 产生8位K1 order8 = '52637498' self . K1 = '' . join ([ P10 [ int ( i )] for i in order8 ]) # 左移2次 P10 = P10 [ 1 : 5 ] + P10 [ 0 ] + P10 [ 6 :] + P10 [ 5 ] P10 = P10 [ 1 : 5 ] + P10 [ 0 ] + P10 [ 6 :] + P10 [ 5 ] # 产生8位K2 self . K2 = '' . join ([ P10 [ int ( i )] for i in order8 ]) print ( 'KEY1: \t {} \n KEY2: \t {} ' . format ( self . K1 , self . K2 )) return ( self . K1 , self . K2 ) def funK ( self , text : str , key : str ) -> str : L , R = text [: 4 ], text [ 4 :] # 拓展/置换 ep1 = R [ 3 ] + R [: 3 ] ep2 = R [ 1 :] + R [ 0 ] ep1 = [ str ( int ( a ) ^ int ( b )) for a , b in zip ( ep1 , key [: 4 ])] ep2 = [ str ( int ( a ) ^ int ( b )) for a , b in zip ( ep2 , key [ 4 :])] S1 = ( '1032' , '3210' , '0213' , '3132' ) S2 = ( '0123' , '2013' , '3010' , '2103' ) ep1 = S1 [ int ( ep1 [ 0 ] + ep1 [ 3 ], 2 )][ int ( ep1 [ 1 ] + ep1 [ 2 ], 2 )] ep1 = ' {0:02b} ' . format ( int ( ep1 )) ep2 = S2 [ int ( ep2 [ 0 ] + ep2 [ 3 ], 2 )][ int ( ep2 [ 1 ] + ep2 [ 2 ], 2 )] ep2 = ' {0:02b} ' . format ( int ( ep2 )) mappingF = ep1 [ 1 ] + ep2 [:: - 1 ] + ep1 [ 0 ] # 映射结果异或 L = int ( mappingF , 2 ) ^ int ( L , 2 ) L = ' {0:04b} ' . format ( int ( L )) # 组合得到结果 res = L + R # print('RES:\t'+res) return res def initKey ( self , key1 , key2 = '' ): 自动初始化密钥 initKey(self,10位密钥) initKey(self,8位密钥1) initKey(self,8位密钥1, 8位密钥1) initKey(self,8位密钥1, 8位密钥2) :param key1: 密钥1 8或10位,str :param key2: 密钥2 8位密钥1为10位时不需要传入, str, '' :return: assert len ( key1 ) in ( 8 , 10 ), '密钥1长度不合法, 应该为8或10位str:' + key1 if len ( key1 ) == 10 : print ( '你输入的是10位密钥，将自动生产两个8位密钥' ) self . generateKey ( key1 ) else : if not key2 : print ( '你输入了一个8位密钥' ) self . K1 = self . K2 = key1 else : assert len ( key2 ) == 8 , '密钥2长度不合法, 应该为8位str:' + key2 print ( '你输入了两个8位密钥' ) self . K1 , self . K2 = key1 , key2 def encode ( self , text : str ) -> str : assert len ( text ) == 8 , '明文长度不合法, 应该为8位str:' + text text = self . IP ( text ) text = self . funK ( text , self . K1 ) text = self . SW ( text ) text = self . funK ( text , self . K2 ) text = self . IP_RE ( text ) print ( '加密完成, 密文: ' + text ) return text def decode ( self , text : str ) -> str : assert len ( text ) == 8 , '密文长度不合法, 应该为8位str:' + text text = self . IP ( text ) text = self . funK ( text , self . K2 ) text = self . SW ( text ) text = self . funK ( text , self . K1 ) text = self . IP_RE ( text ) print ( '解密完成, 明文: ' + text ) return text def __init__ ( self , * args , ** kwargs ): if args or kwargs : print ( '自动设置密钥' ) self . initKey ( * args , ** kwargs ) else : print ( '未设置密钥' ) if __name__ == '__main__' : # s=S_DES() # s.initKey('1010000010') # s.initKey('10100100') # s.initKey('10100100','01000011') s = S_DES ( '1010000010' ) res = s . encode ( '1' * 8 ) s . decode ( res )