python加密解密算法_DES的加密与解密算法（Python实现）

1 MaxTime = 16

2 #IP置换表

3 IP_table=[58, 50, 42, 34, 26, 18, 10, 2,4 60, 52, 44, 36, 28, 20, 12, 4,5 62, 54, 46, 38, 30, 22, 14, 6,6 64, 56, 48, 40, 32, 24, 16, 8,7 57, 49, 41, 33, 25, 17, 9, 1,8 59, 51, 43, 35, 27, 19, 11, 3,9 61, 53, 45, 37, 29, 21, 13, 5,10 63, 55, 47, 39, 31, 23, 15, 7]11 #逆IP置换表

12 Inv_IP_table=[40, 8, 48, 16, 56, 24, 64, 32,13 39, 7, 47, 15, 55, 23, 63, 31,14 38, 6, 46, 14, 54, 22, 62, 30,15 37, 5, 45, 13, 53, 21, 61, 29,16 36, 4, 44, 12, 52, 20, 60, 28,17 35, 3, 43, 11, 51, 19, 59, 27,18 34, 2, 42, 10, 50, 18, 58, 26,19 33, 1, 41, 9, 49, 17, 57, 25]20 #S盒中的S1盒

21 S1=[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,22 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,23 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,24 15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13]25 #S盒中的S2盒

26 S2=[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,27 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,28 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,29 13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9]30 #S盒中的S3盒

31 S3=[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,32 13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,33 13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,34 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12]35 #S盒中的S4盒

36 S4=[ 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,37 13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,38 10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,39 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14]40 #S盒中的S5盒

41 S5=[ 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,42 14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,43 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,44 11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3]45 #S盒中的S6盒

46 S6=[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,47 10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,48 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,49 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13]50 #S盒中的S7盒

51 S7=[ 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,52 13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,53 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,54 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12]55 #S盒中的S8盒

56 S8=[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,57 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,58 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,59 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11]60 #S盒

61 S=[S1,S2,S3,S4,S5,S6,S7,S8]62 #用于对数据进行扩展置换，将32bit数据扩展为48bit

63 extend_table=[32, 1, 2, 3, 4, 5,64 4, 5, 6, 7, 8, 9,65 8, 9, 10, 11, 12, 13,66 12, 13, 14, 15, 16, 17,67 16, 17, 18, 19, 20, 21,68 20, 21, 22, 23, 24, 25,69 24, 25, 26, 27, 28, 29,70 28, 29, 30, 31, 32, 1]71 #P盒

72 P_table=[ 16, 7, 20, 21, 29, 12, 28, 17,73 1, 15, 23, 26, 5, 18, 31, 10,74 2, 8, 24, 14, 32, 27, 3, 9,75 19, 13, 30, 6, 22, 11, 4, 25]76

77 def int2bit(n):#0~15整数转比特

78 a=[]79 for i in range(0,4):80 a.insert(0,str(n%2))81 n=int(n/2)82 returna83

84 #IP置换部分，op为0表示正置换，op为1表示逆置换

85 defIP(text, op):86 tmp = [0 for i in range(64)]87 if op ==0:88 for i in range(64):89 tmp[i] = text[IP_table[i]-1]90 returntmp91 if op == 1:92 for i in range(64):93 tmp[i] = text[Inv_IP_table[i]-1]94 returntmp95 #进行扩展，将32位扩展为48位

96 defExtend(text):97 extend = [0 for i in range(48)]98 for i in range(48):99 extend[i] = text[extend_table[i] - 1]100 returnextend101

102 #S盒变换部分

103 defS_replace(text):104 Sresult = [0 for k in range(32)]105 for k in range(8):106 row = 2*int(text[k*6]) + int(text[k*6+5])107 column = 8*int(text[k*6+1]) + 4*int(text[k*6+2]) + 2*int(text[k*6+3]) + int(text[k*6+4])108 tmp = S[k][row*16+column]109

110 for i in range(4):111 Sresult[4*k + i] =int2bit(tmp)[i]112 returnSresult113 #P置换部分

114 defP_replace(text):115 Presult = [0 for i in range(32)]116 for i in range(32):117 Presult[i] = text[P_table[i]-1]118 returnPresult119 #异或运算

120 defXor(bit1, bit2):121 Xorresult = [0 for i inrange(len(bit1))]122 for i inrange(len(bit1)):123 Xorresult[i] = str(int(bit1[i]) ^int(bit2[i]))124 return Xorresult

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