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#include "StdAfx.h"
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#include "cDESUtils.h"
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/**
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*数据初始置换表
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*/
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int T1[8][8]={58,50,42,34,26,18,10,2,
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60,52,44,36,28,20,12,4,
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62,54,46,38,30,22,14,6,
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64,56,48,40,32,24,16,8,
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57,49,41,33,25,17,9,1,
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59,51,43,35,27,19,11,3,
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61,53,45,37,29,21,13,5,
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63,55,47,39,31,23,15,7};
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/**
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*密钥初始置换表
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*/
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int T2[8][7]={57,49,41,33,25,17,9,
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1,58,50,42,34,26,18,
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10,2,59,51,43,35,27,
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19,11,3,60,52,44,36,
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3,55,47,39,31,23,15,
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7,62,54,46,38,30,22,
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14,6,61,53,45,37,29,
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21,13,5,28,20,12,4};
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/**
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*密钥循环左移位数表
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*/
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//int T3[16]={1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
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int T3[16]={1,2,2,3,1,1,3,2,2,1,3,2,1,1,4,1};
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/**
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*密钥压缩置换表
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*/
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int T4[8][6]={14,17,11,24,1,5,
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3,28,15,6,21,10,
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23,19,12,4,26,8,
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16,7,27,20,13,2,
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41,52,31,37,47,55,
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30,40,51,45,33,48,
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44,49,39,56,34,53,
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46,42,50,36,29,32};
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/**
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*数据扩展表
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*/
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int T5[8][6]={32,1,2,3,4,5,
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4,5,6,7,8,9,
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8,9,10,11,12,13,
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12,13,14,15,16,17,
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16,17,18,19,20,21,
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20,21,22,23,24,25,
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24,25,26,27,28,29,
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28,29,30,31,32,1};
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/**
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*S盒置换表
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*/
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int S[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}},
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{{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}},
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{{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}},
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{{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}},
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{{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}},
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{{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}},
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{{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}},
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{{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}}};
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/**
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*P盒置换表
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*/
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int P[4][8]={16,7,20,21,
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29,12,28,17,
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1,15,23,26,
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5,18,31,10,
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2,8,24,14,
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32,27,3,9,
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19,13,30,6,
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22,11,4,25};
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/**
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*最终置换表
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*/
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int T6[8][8]={ 40,8,48,16,56,24,64,32,
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39,7,47,15,55,23,63,31,
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38,6,46,14,54,22,62,30,
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37,5,45,13,53,21,61,29,
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36,4,44,12,52,20,60,28,
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35,3,43,11,51,19,59,27,
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34,2,42,10,50,18,58,26,
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33,1,41,9,49,17,57,25};
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cDESUtils::cDESUtils(void)
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{
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}
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cDESUtils::~cDESUtils(void)
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{
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}
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/**
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*最终置换函数 64位->64位
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*函数说明：s为完成最后一轮循环得到的64为数据
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*返回值为密文或明文
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*/
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std::string cDESUtils::final_permutation(string s)
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{
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string rs="";
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for(int i=0;i<8;i++)
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{
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for(int j=0;j<8;j++)
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{
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rs+=s[T6[i][j]-1];
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}
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}
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return rs;
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}
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/**
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*P盒置换函数 32位->32位
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*函数说明：s为S盒的输出
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*/
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std::string cDESUtils::P_box(string s)
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{
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string rs="";
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for(int i=0;i<4;i++)
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{
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for(int j=0;j<8;j++)
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{
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rs+=(s[P[i][j]-1]);
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}
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}
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return rs;
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}
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/**
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*S盒置换函数 48位->32位
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*函数说明：s为48位数据
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*返回值为32位
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*/
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std::string cDESUtils::S_box(string s)
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{
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string rs="";
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string s1;
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int k1,k2;//S盒的行号和列号
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int h=1;//决定使用那个S盒
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for(int i=0;i<=42;i=i+6,h++)
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{
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k1=(s[i]-'0')*2+(s[i+5]-'0')*1;
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k2=(s[i+1]-'0')*8+(s[i+2]-'0')*4+(s[i+3]-'0')*2+(s[i+4]-'0')*1;
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int x=S[h-1][k1][k2];
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s1="";
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int y=8;
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for(int j=1;j<=4;j++)
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{
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if(x<y)
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{
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s1+="0";
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y/=2;
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}else
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{
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s1+="1";
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x=x%y;
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y/=2;
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}
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}
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rs+=s1;
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}
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return rs;
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}
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/**
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*异或运算函数
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*要求位数相同
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*/
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std::string cDESUtils::XOR(string s1,string s2)
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{
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string rs="";
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for(int i=0;i<s1.length()&&i<s2.length();i++)
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{
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rs+=((s1[i]-'0')^(s2[i]-'0'))+'0';
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}
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return rs;
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}
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/**
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*数据扩展函数 32->48
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*函数说明：s为数据的右半部分 32位
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*扩展成48位的输出
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*/
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std::string cDESUtils::plaintext_righthalf_extended_permutation(string s)
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{
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string rs="";
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for(int i=0;i<8;i++)
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{
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for(int j=0;j<6;j++)
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{
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rs+=s[T5[i][j]-1];
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}
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}
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return rs;
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}
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/**
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*密钥压缩置换函数 56位->48位
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*函数说明：s为56为的密钥
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*输出为48位的子密钥
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*/
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std::string cDESUtils::secret_key_compression_replacement(string s)
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{
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string rs="";
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for(int i=0;i<8;i++)
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{
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for(int j=0;j<6;j++)
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{
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rs+=s[T4[i][j]-1];
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}
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}
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return rs;
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}
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/**
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*密钥循环左移函数 56位->56位
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*函数说明：k为左移位数 s为密钥
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*返回值位数不变
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*/
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std::string cDESUtils::secret_ket_left_move(int k,string s)
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{
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string s1=s.substr(0,28);
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string s2=s.substr(28,28);
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string rs=s1.substr(k,28-k)+s1.substr(0,k)+s2.substr(k,28-k)+s2.substr(0,k);
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return rs;
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}
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/**
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*密钥初始置换函数 64位->58位
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*函数说明：s为64位的初始密钥
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*返回值为58位
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*/
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std::string cDESUtils::secret_key_initial_permutation(string s)
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{
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string rs="";
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for(int i=0;i<8;i++)
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{
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for(int j=0;j<7;j++)
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{
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rs+=s[T2[i][j]-1];
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}
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}
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return rs;
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}
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/**
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*明文初始置换函数 64位->64位
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*函数说明：s为初始明文 64位
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*返回值为6位
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*/
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std::string cDESUtils::plaintext_initial_permutation(string s)
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{
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string rs="";
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for(int i=0;i<8;i++)
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{
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for(int j=0;j<8;j++)
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{
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rs+=s[T1[i][j]-1];
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}
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}
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return rs;
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}
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/**
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*16进制转2进制函数
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*函数说明：s为16进制字符串
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*返回为2进制字符串
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*/
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std::string cDESUtils::H(string s)
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{
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string s1;
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string rs="";
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for(int i=0;i<s.length();i++)
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{
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int x;
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if(s[i]>='0'&&s[i]<='9')
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{
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x=s[i]-'0';
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}else
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{
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x=s[i]-'A'+10;
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}
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s1="";
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int y=8;
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for(int j=1;j<=4;j++)
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{
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if(x<y)
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{
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y/=2;
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s1+="0";
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}else
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{
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s1+="1";
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x=x%y;
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y=y/2;
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}
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}
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rs+=s1;
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}
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return rs;
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}
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/**
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*2进制转16进制函数
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*str为2进制字符串
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*返回值为16进制字符串
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*/
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std::string cDESUtils::G(string str)
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{
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string rs="";
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char temp;
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for(int i=0;i<=str.length()-4;i=i+4)
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{
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int x=(str[i]-'0')*8+(str[i+1]-'0')*4+(str[i+2]-'0')*2+str[i+3]-'0';
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if(x>=10)
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{
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temp=(char)(x-10+'A');
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}else
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{
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temp=(char)(x+'0');
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}
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rs+=temp;
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}
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return rs;
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}
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/**
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*封装函数f
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*函数说明：接收32位数据和48位的子密钥 产生一个32位的输出
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*str1:32位数据 str2:48位的子密钥
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*返回值32位
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*/
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std::string cDESUtils::foldFunc(string str1,string str2)
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{
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//32位数据扩展为48位
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string expendR=plaintext_righthalf_extended_permutation(str1);
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//密钥和扩展数据异或
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string rs=XOR(expendR,str2);
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//S盒替代(48->32)
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rs=S_box(rs);
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//P盒替代(32->32)
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rs=P_box(rs);
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return rs;
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}
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/**
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*子密钥生成函数
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*函数说明：s为给定的密钥
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*生成16个子密钥
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*/
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void cDESUtils::generateKeys(string s)
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{
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s=secret_key_initial_permutation(s);
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for(int i=1;i<=16;i++)
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{
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s=secret_ket_left_move(T3[i-1],s);
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Keys[i]=secret_key_compression_replacement(s);
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}
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}
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/**
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*DES加密函数 64位->64位
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*函数说明：str1为64位的给定明文
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*返回值为64位的密文
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*/
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std::string cDESUtils::encrypt(string str1)
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{
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//第一步:明文初始置换 64->64
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str1=plaintext_initial_permutation(str1);
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//第二步:数据分组
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string left=str1.substr(0,32);
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string right=str1.substr(32,32);
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string newleft;
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//第三步:16轮迭代
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for(int i=1;i<=16;i++)
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{
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newleft=right;
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right=XOR(left,foldFunc(right,Keys[i]));
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left=newleft;
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}
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//第四步:合并数据 注意位R16L16
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string rs=right+left;
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//结尾置换
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rs=final_permutation(rs);
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return rs;
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}
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/**
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*解密函数
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*str为密文
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*输出明文
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*/
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std::string cDESUtils::decrypt(string str)
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{
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//把密文当作明文进行初始明文置换(64->64)
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str=plaintext_initial_permutation(str);
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//分组
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string left=str.substr(0,32);
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string right=str.substr(32,32);
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string newleft;
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//逆序的子密钥使用 16轮迭代
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for(int i=16;i>=1;i--)
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{
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newleft=right;
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right=XOR(left,foldFunc(right,Keys[i]));
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left=newleft;
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}
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//合并
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string rs=right+left;
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//最后置换
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rs=final_permutation(rs);
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return rs;
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}
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