DES加密的python实现

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#IP置换表IP_table=[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 ]#逆IP置换表_IP_table=[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 ]#S盒中的S1盒S1=[14,  4, 13,  1,  2, 15, 11,  8,  3, 10,  6, 12,  5,  9,  0,  7,0, 15,  7,  4, 14,  2, 13,  1, 10,  6, 12, 11,  9,  5,  3,  8,4,  1, 14,  8, 13,  6,  2, 11, 15, 12,  9,  7,  3, 10,  5,  0,  15, 12,  8,  2,  4,  9,  1,  7,  5, 11,  3, 14, 10,  0,  6, 13 ]#S盒中的S2盒S2=[15,  1,  8, 14,  6, 11,  3,  4,  9,  7,  2, 13, 12,  0,  5, 10,3, 13,  4,  7, 15,  2,  8, 14, 12,  0,  1, 10,  6,  9, 11,  5,0, 14,  7, 11, 10,  4, 13,  1,  5,  8, 12,  6,  9,  3,  2, 15,  13,  8, 10,  1,  3, 15,  4,  2, 11,  6,  7, 12,  0,  5, 14,  9 ]#S盒中的S3盒S3=[10,  0,  9, 14,  6,  3, 15,  5,  1, 13, 12,  7, 11,  4,  2,  8,  13,  7,  0,  9,  3,  4,  6, 10,  2,  8,  5, 14, 12, 11, 15,  1,  13,  6,  4,  9,  8, 15,  3,  0, 11,  1,  2, 12,  5, 10, 14,  7,1, 10, 13,  0,  6,  9,  8,  7,  4, 15, 14,  3, 11,  5,  2, 12 ]#S盒中的S4盒S4=[7, 13, 14,  3,  0,  6,  9, 10,  1,  2,  8,  5, 11, 12,  4, 15,  13,  8, 11,  5,  6, 15,  0,  3,  4,  7,  2, 12,  1, 10, 14,  9,  10,  6,  9,  0, 12, 11,  7, 13, 15,  1,  3, 14,  5,  2,  8,  4,3, 15,  0,  6, 10,  1, 13,  8,  9,  4,  5, 11, 12,  7,  2, 14 ]#S盒中的S5盒S5=[2, 12,  4,  1,  7, 10, 11,  6,  8,  5,  3, 15, 13,  0, 14,  9,  14, 11,  2, 12,  4,  7, 13,  1,  5,  0, 15, 10,  3,  9,  8,  6,4,  2,  1, 11, 10, 13,  7,  8, 15,  9, 12,  5,  6,  3,  0, 14,  11,  8, 12,  7,  1, 14,  2, 13,  6, 15,  0,  9, 10,  4,  5,  3 ]#S盒中的S6盒S6=[12,  1, 10, 15,  9,  2,  6,  8,  0, 13,  3,  4, 14,  7,  5, 11,  10, 15,  4,  2,  7, 12,  9,  5,  6,  1, 13, 14,  0, 11,  3,  8,9, 14, 15,  5,  2,  8, 12,  3,  7,  0,  4, 10,  1, 13, 11,  6,4,  3,  2, 12,  9,  5, 15, 10, 11, 14,  1,  7,  6,  0,  8, 13 ]#S盒中的S7盒S7=[4, 11,  2, 14, 15,  0,  8, 13,  3, 12,  9,  7,  5, 10,  6,  1,  13,  0, 11,  7,  4,  9,  1, 10, 14,  3,  5, 12,  2, 15,  8,  6,1,  4, 11, 13, 12,  3,  7, 14, 10, 15,  6,  8,  0,  5,  9,  2,6, 11, 13,  8,  1,  4, 10,  7,  9,  5,  0, 15, 14,  2,  3, 12 ]#S盒中的S8盒S8=[13,  2,  8,  4,  6, 15, 11,  1, 10,  9,  3, 14,  5,  0, 12,  7,1, 15, 13,  8, 10,  3,  7,  4, 12,  5,  6, 11,  0, 14,  9,  2,7, 11,  4,  1,  9, 12, 14,  2,  0,  6, 10, 13, 15,  3,  5,  8,2,  1, 14,  7,  4, 10,  8, 13, 15, 12,  9,  0,  3,  5,  6, 11 ]# S盒S=[S1,S2,S3,S4,S5,S6,S7,S8]#P盒P_table=[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 ]#压缩置换表1，不考虑每字节的第8位，将64位密钥减至56位。然后进行一次密钥置换。yasuo1_table=[ 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 ]#压缩置换表2，用于将循环左移和右移后的56bit密钥压缩为48bityasuo2_table=[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 ]#用于对数据进行扩展置换，将32bit数据扩展为48bitextend_table=[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 ]#将字符转换为对应的Unicode码，中文用2个字节表示def char2unicode_ascii(intext,length):     outtext=[]     for i in range(length):         outtext.append(ord(intext[i]))     return outtext#将Unicode码转为bit    def unicode2bit(intext,length):     outbit=[]     for i in range(length*16):         outbit.append((intext[int(i/16)]>>(i%16))&1)#一次左移一bit     return outbit#将8位ASCII码转为bit    def byte2bit(inchar,length):     outbit=[]     for i in range(length*8):         outbit.append((inchar[int(i/8)]>>(i%8))&1)#一次左移一bit     return outbit#将bit转为Unicode码def bit2unicode(inbit,length):     out=[]     temp=0     for i in range(length):         temp=temp|(inbit[i]<<(i%16))         if i%16==15:                         out.append(temp)             temp=0     return out#将bit转为ascii 码def bit2byte(inbit,length):     out=[]     temp=0     for i in range(length):         temp=temp|(inbit[i]<<(i%8))         if i%8==7:                         out.append(temp)             temp=0     return out#将unicode码转为字符（中文或英文）def unicode2char(inbyte,length):     out=""     for i in range(length):         out=out+chr(inbyte[i])     return out#生成每一轮的keydef createKeys(inkeys):     keyResult=[]     asciikey=char2unicode_ascii(inkeys,len(inkeys))     keyinit=byte2bit(asciikey,len(asciikey)) #    print("keyinit=",end='') #    print(keyinit)    #初始化列表key0,key1     key0=[0 for i in range(56)]     key1=[0 for i in range(48)]    #进行密码压缩置换1，将64位密码压缩为56位     for i in range(56):         key0[i]=keyinit[yasuo1_table[i]-1]    #进行16轮的密码生成             for i in range(16):        #---------确定左移的次数----------         if (i==0 or i==1 or i==8 or i==15):             moveStep=1         else:             moveStep=2         #------------------------------         #--------分两部分，每28bit位一部分，进行循环左移------------             for j in range(moveStep):             for k in range(8):                 temp=key0[k*7]                 for m in range(7*k,7*k+6):                     key0[m]=key0[m+1]                 key0[k*7+6]=temp             temp=key0[0]             for k in range(27):                 key0[k]=key0[k+1]             key0[27]=temp             temp=key0[28]             for k in  range(28,55):                 key0[k]=key0[k+1]             key0[55]=temp         #-----------------------------------------------------         #------------对56位密钥进行压缩置换，压缩为48位-------------         for k in range(48):             key1[k]=key0[yasuo2_table[k]-1]              keyResult.extend(key1)         #------------------------------------------------------     return keyResultdef DES(text,key,optionType):     keyResult=createKeys(key)     finalTextOfBit=[0 for i in range(64)]     finalTextOfUnicode=[0 for i in range(4)] #    print(keyResult)             if optionType==0:#选择的操作类型为加密         tempText=[0 for i in range(64)]#用于临时盛放IP逆置换之前，将L部分和R部分合并成64位的结果         extendR=[0 for i in range(48)]#用于盛放R部分的扩展结果         unicodeText=char2unicode_ascii(text,len(text)) #        print(unicodeText)         bitText=unicode2bit(unicodeText,len(unicodeText)) #        print(bitText)         initTrans=[0 for i in range(64)]#初始化，用于存放IP置换后的结果         #------------------进行初始IP置换---------------         for i in range(64):             initTrans[i]=bitText[IP_table[i]-1]         #将64位明文分为左右两部分         L=[initTrans[i] for i in range(32)]         R=[initTrans[i] for i in range(32,64)]         #开始进行16轮运算                       for i in range(16):             tempR=R #用于临时盛放R             #-----------进行扩展，将32位扩展为48位--------             for j in range(48):                 extendR[j]=R[extend_table[j]-1]  #           print(len(keyResult))                 keyi=[keyResult[j] for j in range(i*48,i*48+48)]             #----------与key值进行异或运算----------------             XORResult=[0 for j in range(48)]             for j in range(48):                 if keyi[j]!=extendR[j]:                     XORResult[j]=1             SResult=[0 for k in range(32)]              #---------开始进行S盒替换-------------------                       for k in range(8):                 row=XORResult[k*6]*2+XORResult[k*6+5]                 column=XORResult[k*6+1]*8+XORResult[k*6+2]*4+XORResult[k*6+3]*2+XORResult[k*6+4]                 temp=S[k][row*16+column]                 for m in range(4):                     SResult[k*4+m]=(temp>>m)&1              #-----------------------------------------             PResult=[0 for k in range(32)]             #--------------开始进行P盒置换----------------             for k in range(32):                 PResult[k]=SResult[P_table[k]-1]             #------------------------------------------             #--------------与L部分的数据进行异或------------             XORWithL=[0 for k in range(32)]             for k in range(32):                 if L[k]!=PResult[k]:                     XORWithL[k]=1             #----------------------------------------------             #-------------将临时保存的R部分值，即tempR复制给L------             L=tempR             R=XORWithL         #----交换左右两部分------         L,R=R,L         #-----合并为一部分         tempText=L         tempText.extend(R)         #-----------IP逆置换--------         for k in range(64):             finalTextOfBit[k]=tempText[_IP_table[k]-1]         finalTextOfUnicode=bit2byte(finalTextOfBit,len(finalTextOfBit)) #        print(finalTextOfUnicode)         finalTextOfChar=unicode2char(finalTextOfUnicode,len(finalTextOfUnicode)) #        print(finalTextOfChar)         return finalTextOfChar     else:#选择的操作类型为解密         tempText=[0 for i in range(64)]#用于临时盛放IP逆置换之前，将L部分和R部分合并成64位的结果         extendR=[0 for i in range(48)]#用于盛放R部分的扩展结果         unicodeText=char2unicode_ascii(text,len(text)) #        print(unicodeText)         bitText=byte2bit(unicodeText,len(unicodeText)) #        print(bitText)         initTrans=[0 for i in range(64)]#初始化，用于存放IP置换后的结果         #------------------进行初始IP置换---------------         for i in range(64):             initTrans[i]=bitText[IP_table[i]-1]         #将64位明文分为左右两部分         L=[initTrans[i] for i in range(32)]         R=[initTrans[i] for i in range(32,64)]         #-----------------开始16轮的循环-----------------         for i in range(15,-1,-1):             tempR=R #用于临时盛放R             #-----------进行扩展，将32位扩展为48位--------             for j in range(48):                 extendR[j]=R[extend_table[j]-1]             keyi=[keyResult[j] for j in range(i*48,i*48+48)]             #----------与key值进行异或运算----------------             XORResult=[0 for j in range(48)]             for j in range(48):                 if keyi[j]!=extendR[j]:                     XORResult[j]=1             SResult=[0 for k in range(32)]              #---------开始进行S盒替换-------------------                       for k in range(8):                 row=XORResult[k*6]*2+XORResult[k*6+5]                 column=XORResult[k*6+1]*8+XORResult[k*6+2]*4+XORResult[k*6+3]*2+XORResult[k*6+4]                 temp=S[k][row*16+column]                 for m in range(4):                     SResult[k*4+m]=(temp>>m)&1              #-----------------------------------------             PResult=[0 for k in range(32)]             #--------------开始进行P盒置换----------------             for k in range(32):                 PResult[k]=SResult[P_table[k]-1]             #------------------------------------------             #--------------与L部分的数据进行异或------------             XORWithL=[0 for k in range(32)]             for k in range(32):                 if L[k]!=PResult[k]:                     XORWithL[k]=1             #----------------------------------------------             #-------------将临时保存的R部分值，即tempR复制给L------             L=tempR             R=XORWithL         #----交换左右两部分------         L,R=R,L         #-----合并为一部分         tempText=L         tempText.extend(R)         #-----------IP逆置换--------         for k in range(64):             finalTextOfBit[k]=tempText[_IP_table[k]-1]         finalTextOfUnicode=bit2unicode(finalTextOfBit,len(finalTextOfBit)) #        print(finalTextOfUnicode)         finalTextOfChar=unicode2char(finalTextOfUnicode,len(finalTextOfUnicode)) #        print(finalTextOfChar)         return finalTextOfChar        def main():     text=input("请输入要操作的文本:  ")     print(" ".join(["输入的文本时",text]))     optionType=input("请选择是进行加密还是解密，加密输入0，解密输入1:  ")     while(not(optionType=='0' or optionType=='1')):         print("Wrong!!!选择的操作类型只能是0或者是1")         optionType=input("请选择是进行加密还是解密，加密输入0，解密输入1:  ")     length=len(text)     Result=""     if optionType=='0': #        f=open('D:\encyptText.txt','w')  #----------若输入文本的长度不是4的整数倍，即不是64字节的整数倍，用空格补全（此处为了加密中文，用的是unicode编码，即用16字节表示一个字符）-------         text=text+(length%4)*" "         length=len(text)         key=input("请输入8位加密密码: ")         while(len(key)!=8):             print("wrong!!请输入8位密码")             key=input("请输入8位加密密码: ")         print("加密后的文本：",end=" ")                     for i in range(int(length/4)):             tempText=[text[j] for j in range(i*4,i*4+4)]             Result="".join([Result,DES(tempText,key,int(optionType))]) #            f.write(Result)         print(Result)     if optionType=='1': #----------若输入文本的长度不是8的整数倍，即不是64字节的整数倍，用空格补全（此处解密出来的密文用的是每8bit转换为一个ascii码，所以生成的八位表示的字符）------- #        text=text+(length%8)*" "         length=len(text)          key=input("请输入8位解密密码: ")         while(len(key)!=8):             print("wrong!!请输入8位密码")             key=input("请输入8位解密密码: ")         print("解密后的文本：",end=" ")         for i in range(int(length/8)):             tempText=[text[j] for j in range(i*8,i*8+8)]             Result="".join([Result,DES(tempText,key,int(optionType))])         print(Result)
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