最近工作中需要用到python中的DES算法，虽然有现成的库，但总感觉用着不方便。于是把之前用的C和Java写的DES和MAC算法移植到python中。测试了下没问题。

这样以后就方便了，。在python中终于可以用DES算法了。之前把C写的DES算法封装成动态库，然后由python的ｃｔｙｐｅｓ调用，虽然可以但是不是很方便。

附：python版DES算法源码，还未封装成类，仍在完善中。源码CSDN资源中可下载。直接编译执行没问题。

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
# 2014/10/16  wrote by yangyongzhen
# QQ:534117529
# global definition
# base = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F]

__author__ = 'YangYongZhen'

base = [str(x) for x in range(10)] + [ chr(x) for x in range(ord('A'),ord('A')+6)]
# bin2dec
# 二进制 to 十进制: int(str,n=10)
def bin2dec(string_num):
	return str(int(string_num, 2))

# hex2dec
# 十六进制 to 十进制
def hex2dec(string_num):
	return str(int(string_num.upper(), 16))

# dec2bin
# 十进制 to 二进制: bin()
def dec2bin(string_num):
	num = int(string_num)
	mid = []
	while True:
		if num == 0: break
		num,rem = divmod(num, 2)
		mid.append(base[rem])

	return ''.join([str(x) for x in mid[::-1]])

# dec2hex
# 十进制 to 八进制: oct()
# 十进制 to 十六进制: hex()
def dec2hex(string_num):
	num = int(string_num)
	if num==0:
		return '0'
	mid = []
	while True:
		if num == 0: break
		num,rem = divmod(num, 16)
		mid.append(base[rem])

	return ''.join([str(x) for x in mid[::-1]])

# hex2tobin
# 十六进制 to 二进制: bin(int(str,16))
def hex2bin(string_num):
	return dec2bin(hex2dec(string_num.upper()))

# bin2hex
# 二进制 to 十六进制: hex(int(str,2))
def bin2hex(string_num):
	return dec2hex(bin2dec(string_num))
'''
/**
 * PBOC3DES 加密算法
 * @author Administrator
 *
 */
'''
class PBOC_DES():
	pass
'''
/** ***************************压缩替换S-Box************************************************* */
'''
subKey = [([0] * 48) for ll in range(16)]

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 ] ]

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 ] ]

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 ] ]

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 ] ]

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 ] ]

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 ] ]

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 ] ]

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 ] ]

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 ]

_ip = [ 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 ]
# 每次密钥循环左移位数
LS = [ 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2,2, 1 ]
'''
/**
 * IP初始置换
 * @param source
 * @return
 */
'''
def changeIP(source):
	dest= [0]*64
	global ip
	for i in range(64):
		dest[i] = source[ip[i] - 1]
	return dest


def string2Binary(str):
	le = len(str)
	dest =[0]*le*4
	i = 0
	for c in str:
	   i += 4
	   j = 0
	   s = hex2bin(c)
	   l = len(s)
	   for d in s:
		dest[i-l+j]=int(d)
		j += 1
	return dest

'''
/**
 * IP-1逆置
 * @param source
 * @return
 */
'''
def changeInverseIP(source):
		dest = [0]*64
		global _ip
		for i in range(64):
			dest[i] = source[_ip[i] - 1]

		return dest
'''
/**
 *
 * 获取轮子密钥(48bit)
 *
 * @param source
 *
 * @return
 *
 */
'''
def setKey(source):
	global subKey
	# 装换4bit
	temp = string2Binary(source)
	# 6bit均分成两部分
	left =  [0]*28
	right = [0]*28
	# 经过PC-14bit转换6bit
	temp1 = [0]*56
	temp1 = keyPC_1(temp)
	# printArr(temp1);
	#将经过转换的temp1均分成两部分
	for i in range(28):
		left[i] = temp1[i]
		right[i] = temp1[i + 28]
	# 经过16次循环左移，然后PC-2置换
	for i in range(16):
		left = keyLeftMove(left, LS[i])
		right = keyLeftMove(right, LS[i])
		for j in range(28):
				temp1[j] = left[j]
				temp1[j + 28] = right[j]
		subKey[i] = keyPC_2(temp1)

'''
/**
 *
 * 6bit的密钥转换成48bit
 * @param source
 * @return
 *
 */
'''
def keyPC_2(source):
	dest = [0]*48
	temp = [ 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 ]
	for i in range(48):
		dest[i] = source[temp[i] - 1]
	return dest

'''
/**
 *
 * 将密钥循环左移i
 * @param source 二进制密钥数
 * @param i 循环左移位数
 * @return
 *
 */
'''
def keyLeftMove( source, i):
	temp = 0
	global LS
	le = len(source)
	ls = LS[i]
	for k in range(ls):
		temp = source[0]
		for j in range(le-1):
			source[j] = source[j + 1]
	source[le - 1] = temp
	return source
'''
/**
 *
 * 4bit的密钥转换成56bit
 * @param source
 * @return
 *
 */
'''
def keyPC_1(source):
	dest = [0]*56
	temp = [ 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 ]
	for i in range(56):
		dest[i] = source[temp[i] - 1]
	return dest
'''
/**
 * 两个等长的数组做异或
 * @param source1
 * @param source2
 * @return
 */
'''
def diffOr( source1, source2):
	le = len(source1)
	dest = [0]*le
	for i in range(le):
		dest[i] = source1[i] ^ source2[i]
	return dest
'''
/**
 *
 * DES加密--->对称密钥
 * D = Ln(32bit)+Rn(32bit)
 * 经过16轮置
 * @param D(16byte)明文
 * @param K(16byte)轮子密钥
 * @return (16byte)密文
 */
'''
def encryption( D,  K) :
	temp = [0]*64;
	data = http://www.mamicode.com/string2Binary(D)>

python 版DES和MAC算法