DES加密解密使用bitset编写...

最新推荐文章于 2021-12-17 09:07:48 发布

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最新推荐文章于 2021-12-17 09:07:48 发布

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分类专栏：算法程序文章标签： DES 算法 bitset

本文链接：https://blog.youkuaiyun.com/Yao_jianlun/article/details/8764763

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本文探讨了在使用bitset进行DES加密解密过程中需要注意的问题，特别是在处理位序上的差异。由于bitset的高位在左侧，而DES的高位在右侧，这可能导致在转换为ulong时出现错误。解密过程虽然与加密类似，但获取密钥的顺序是从第16轮到第1轮。

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#include<iostream>
#include<bitset>
#include<string> 

using namespace std;

int IPTable[64] = {
	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
};

int CPTable[48] = {
	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
};

int SiftTable[16] = {
	1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1
};

int EPTable[48] = {
    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
};

int SBoxTable[8][4][16] = {
	{
	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
	},
	
	{
	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
	},
	
	{
	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
	},
	
	{
	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,
	},
	
	{
	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
	},
	
	{
	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
	},
	
	{
	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