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Des.py
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Des.py
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#!/usr/bin/env python
#-*- coding:utf-8 -*-
class Des:
def __init__(self,inputText,inputKey):
self.inputText = inputText
self.inputKey = inputKey
def DealBin(self,bin):
if len(bin) != 8:
bin = '0'*(8-len(bin)) + bin
return bin
def HexToBin(self):
return ''.join([self.DealBin(bin(int(text,16))[2:])[4:] for text in self.inputText])
def AsciiToBin(self):
return ''.join([self.DealBin(bin(int(ord(text)))[2:]) for text in self.inputText])
def BinToAscii(self,Array):
get = ''.join(Array)
return ''.join([hex(int(get[i*4:(i+1)*4],2))[2:]for i in range(len(get)/4)]).upper()
def IpSubFirst(self):
ipTable = [
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]
return [self.HexToBin()[int(i)-1] for i in ipTable]
def TwoArrayToOne(self,Array):
oneArray = []
for i in Array:
oneArray += i
return oneArray
def LeftAndRight(self):
return self.IpSubFirst()[0:32],self.IpSubFirst()[32:]
def ExtendChange(self,Array):
extendTable = [
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 ]
left,right = Array
return [right[int(i)-1] for i in extendTable]
def XorKey(self,num,Array):
return [bin(int(x)^int(y))[2:] for x,y in zip(self.ExtendChange(Array),self.inputKey.Compress(num))]
def SboxCompress(self,inputArray,sBox):
row = inputArray[0] + inputArray[5]
col = ''.join(inputArray[1:5])
getBin = bin(sBox[(int(row,2))*16+int(col,2)])[2:]
if len(getBin) < 4:
getBin = '0'*(4-len(getBin)) + getBin
return getBin
def ChoeseCompress(self,num,Array):
sBox = [
[
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,
],
]
getKey = self.XorKey(num,Array)
AfterCom = ''.join([self.SboxCompress(getKey [i*6:(i+1)*6],sBox[i]) for i in range(8)])
return [i for i in AfterCom]
def SubPbox(self,num,Array):
pBox = [
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]
getCompress = self.ChoeseCompress(num,Array)
return [getCompress[i-1] for i in pBox]
def Final(self):
Array = self.LeftAndRight()
left,right = Array
print "i=0"
print "left:" + self.BinToAscii(left)
print "right:" + self.BinToAscii(right)
for i in range(16):
print '-'*50
print "i=" + str(i+1)
if i < 15:
getRight = right
getSubBox = self.SubPbox(i,Array)
right = [str(int(x)^int(y)) for x,y in zip(getSubBox,left)]
left = getRight
Array = (left,right)
else:
left = [str(int(x)^int(y)) for x,y in zip(self.SubPbox(i,Array),left)]
print "left:" + self.BinToAscii(left)
print "right:" + self.BinToAscii(right)
return left + right
def ConverseFirstIp(self,text):
converseIpTable = [
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]
return [text[i-1] for i in converseIpTable]
def Combine(self):
text = self.Final()
print '-'*50
print 'LeftAndRightCombine:\n' + self.BinToAscii(text)
print 'FinalSecretText:\n' + self.BinToAscii(self.ConverseFirstIp(text))
class Key:
def __init__(self,inputKey):
self.inputKey = inputKey
def HexToBin(self):
return ''.join([self.DealBin(bin(int(text,16))[2:])[4:] for text in self.inputKey])
def DealBin(self,bin):
if len(bin) != 8:
bin = '0'*(8-len(bin)) + bin
return bin
def SubSelect(self):
changeTable = [
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,]
up = [self.HexToBin()[i-1] for i in changeTable[0:28]]
down = [self.HexToBin()[i-1] for i in changeTable[28:]]
return up,down
def Move(self,Array):
element = Array.pop(0)
Array.append(element)
return Array
def CountList(self,Array,num):
return sum([Array[i] for i in range(num)])
def LeftMove(self,times):
moveTimes = [
1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1]
leftArray,rightArray = self.SubSelect()
#for i in range(moveTimes[times]):
for i in range(self.CountList(moveTimes,times+1)):
leftArray = self.Move(leftArray)
rightArray = self.Move(rightArray)
return leftArray + rightArray
def BinToAscii(self,Array):
get = ''.join(Array)
return ''.join([hex(int(get[i*4:(i+1)*4],2))[2:] for i in range(len(get)/4)]).upper()
def Compress(self,times):
compressTable = [
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]
key = [self.LeftMove(times)[i-1] for i in compressTable]
print "key:" + self.BinToAscii(key)
return key
def main():
inputText = '123456ABCD132536'
inputKey = 'AABB09182736CCDD'
key = Key(inputKey)
des = Des(inputText,key)
des.Combine()
if __name__ == '__main__':
main()