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补上上篇日志说的DES算法Source，C语言写的，基本功能，有兴趣的自己改吧

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des_encode.cpp 

 

 

/********DES Encript by namgking********************************************/
/********compile on windows xp sp2,C-Free 3.5*****************************/
/********E-mail:  namg2000@163.com***************************************/
/********Author:   namgking*************************************************/
/********Note: if the code is of using,it's coded by namgking,*************/
/********or I don't know who did it!^_^************************************/
#include<stdio.h>
#include<string.h>
#include"des_encode.h"
int key[16][48];
char str[8];
void main()                 //main function
{
    EncodeMain();

}


void EncodeMain()           //EncodeMain function
{
  int i;

  char keychar[8];

  int key2[8];
  int strkey[8];


  printf("请输入8个要加密的字符：/n");
  for(i=0;i<8;i++)
     scanf("%c",&str[i]);
  getchar();
  for(i=0;i<8;i++)
    strkey[i]=str[i];
  printf("/n输入明文的十六进制为:/n");
  for(i=0;i<8;i++)
    printf("%10x",strkey[i]);
  printf("/n请输入密钥(8个字符):/n");
  for(i=0;i<8;i++)
     scanf("%c",&keychar[i]);
  for(i=0;i<8;i++)
     key2[i]=keychar[i];
  getchar();
   // printf("%c",keychar[i]);
  Encode(strkey,key2);
  printf("/n加密后十六进制密文是:/n");
  for(i=0;i<8;i++)
     printf("%10x",strkey[i]);
  printf("/n/n清输入解密密码/n");
  for(i=0;i<8;i++)
    scanf("%c",&keychar[i]);
  for(i=0;i<8;i++)
     key2[i]=keychar[i];
  Decode(strkey,key2);
  for(i=0;i<8;i++)
    printf("%10x",strkey[i]);
  for(i=0;i<8;i++)
    str[i]=strkey[i];
  printf("/n明文为：/t");
  for(i=0;i<8;i++)
    printf("%c",str[i]);
  printf("/n/n");

}


void keyBuild(int *keychar){            //create key array
    int i,j;
    int movebit[]={1,1,2,2,2,2,2,2,
                   1,2,2,2,2,2,2,1};
    int midkey2[56];
    int midkey[64];
    StrtoBin(midkey,keychar);
    for(i=0;i<56;i++)
      midkey2[i]=midkey[PC1[i]-1];
    for(i=0;i<16;i++)
      keyCreate(midkey2,movebit[i],i);
   }
void StrtoBin(int *midkey,int *keychar){     //change into binary
    int trans[8],i,j,k,n;
    n=0;
    for(i=0;i<8;i++){
        j=0;
        while(keychar[i]!=0){
            trans[j]=keychar[i]%2;
            keychar[i]=keychar[i]/2;
            j++;
        }
        for(k=j;k<8;k++)trans[k]=0;
        for(k=0;k<8;k++)
           midkey[n++]=trans[7-k];
    }
   }
void keyCreate(int *midkey2,int movebit,int n){
    int i,temp[4];
    temp[0]=midkey2[0];
    temp[1]=midkey2[1];
    temp[2]=midkey2[28];
    temp[3]=midkey2[29];
   if(movebit==2){
       for(i=0;i<26;i++){
         midkey2[i]=midkey2[i+2];
         midkey2[i+28]=midkey2[i+30];
       }
       midkey2[26]=temp[0];midkey2[27]=temp[1];
       midkey2[54]=temp[2];midkey2[55]=temp[3];  }
     else
     { for(i=0;i<27;i++){
        midkey2[i]=midkey2[i+1];
        midkey2[i+28]=midkey2[i+29];
       }
       midkey2[27]=temp[0];midkey2[55]=temp[2];
     }
    for(i=0;i<48;i++)
      key[n][i]=midkey2[PC2[i]-1];
}
void EncodeData(int *lData,int *rData,int *str){   //encodedata function
    int i,j,temp[8],lint,rint;//int h;
    int data[64];
    lint=0,rint=0;
    for(i=0;i<4;i++){
       j=0;
       while(str[i]!=0){
         temp[j]=str[i]%2;
         str[i]=str[i]/2;
         j++;
       }
       while(j<8)temp[j++]=0;
       for(j=0;j<8;j++)
        lData[lint++]=temp[7-j];
       j=0;
       while(str[i+4]!=0){
        temp[j]=str[i+4]%2;
        str[i+4]=str[i+4]/2;
        j++;
       }
       while(j<8)temp[j++]=0;
       for(j=0;j<8;j++)rData[rint++]=temp[7-j];
    }
    for(i=0;i<32;i++){
       data[i]=lData[i];
       data[i+32]=rData[i];
    }

    for(i=0;i<32;i++){
       lData[i]=data[IP1[i]-1];//printf("P1:%5d:%5d,%5d/n",IP1[i],lData[i],data[IP1[i]-1]);
       rData[i]=data[IP1[i+32]-1];
    }
    }
void F(int *rData,int *key){                   //F function
    int i,rDataP[48];
    Expand(rData,rDataP);


    for(i=0;i<48;i++){
      rDataP[i]=rDataP[i]^key[i];// printf("%10d",rDataP[i]);if((i+1)%6==0)printf("/n");
      }

    ExchangeS(rDataP,rData);

    ExchangeP(rData);


   }
void Expand(int *rData,int *rDataP){          //Expand function
    int i;
    for(i=0;i<48;i++)
      rDataP[i]=rData[Ex[i]-1];
   }
void ExchangeS(int *rDataP,int *rData){          //S-diagram change
    int i,n,linex,liney;
    linex=liney=0;
    for(i=0;i<48;i+=6){
        n=i/6; //printf("%10d/n",(rDataP[i]<<1));
        linex=(rDataP[i]<<1)+rDataP[i+5];
        liney=(rDataP[i+1]<<3)+(rDataP[i+2]<<2)+(rDataP[i+3]<<1)+rDataP[i+4];

        FillBin(rData,n,s[n][linex][liney]);
    }
   }
void ExchangeP(int *rData){                     //P change
    int i,temp[32];
    for(i=0;i<32;i++)
      temp[i]=rData[i];

    for(i=0;i<32;i++)
      rData[i]=temp[P[i]-1];
  }
void FillBin(int *rData,int n,int s){         // data to binary;call by S-Diagram change function
    int temp[4],i;
    for(i=0;i<4;i++){
        temp[i]=s%2;
        s=s/2;
        }
    for(i=0;i<4;i++)
        rData[n*4+i]=temp[3-i];
    }
void DecodeData(int *str,int *lData,int *rData){    //DecodeData from binary
    int i;int a,b;int data[64];
    a=0,b=0;
    for(i=0;i<32;i++){
        data[i]=lData[i];
        data[i+32]=rData[i];
    }
    for(i=0;i<32;i++){
        lData[i]=data[IP2[i]-1];
        rData[i]=data[IP2[i+32]-1];
    }
    for(i=0;i<32;i++){
        a=(lData[i]&0x1)+(a<<1);
        b=(rData[i]&0x1)+(b<<1);
        if((i+1)%8==0){
            str[i/8]=a;a=0;//printf("%d",i/8);
            str[i/8+4]=b;b=0;//printf("%d",i/8+4);
        }
    }

    }
  
void Encode(int *str,int *keychar){           //encode: input 8 chars,8 keychars
   int lData[32],rData[32],temp[32],rDataP[48];
   int i,j;
   keyBuild(keychar);

   EncodeData(lData,rData,str);
   for(i=0;i<16;i++){
     for(j=0;j<32;j++)
        temp[j]=rData[j];
     F(rData,key[i]);
     for(j=0;j<32;j++){
        rData[j]=rData[j]^lData[j];
     }

     for(j=0;j<32;j++)
        lData[j]=temp[j];
   }

   DecodeData(str,rData,lData);

}
void Decode(int *str,int *keychar){           //decode :input 8 chars,8 keychars
   int lData[32],rData[32],temp[32],rDataP[48];
   int i,j;
   keyBuild(keychar);
   EncodeData(lData,rData,str); //这个位置
   for(i=0;i<16;i++){
     for(j=0;j<32;j++)
        temp[j]=rData[j];
     F(rData,key[15-i]);
     for(j=0;j<32;j++){
        rData[j]=rData[j]^lData[j];
     }

     for(j=0;j<32;j++){
        lData[j]=temp[j];
        }
   }
   DecodeData(str,rData,lData);
}

 

Des_encode.h

 void EncodeMain();                                                  //EncodeMain function
void DecodeMain();                                                 //Sorry ,it has not used
void Decode(int *str,int *keychar);                            //decode :input 8 chars,8 keychars
void Encode(int *str,int *keychar);                            //encode: input 8 chars,8 keychars
void keyBuild(int *keychar);                                     //create key array
void StrtoBin(int *midkey,int *keychar);                   //change into binary
void keyCreate(int *midkey2,int movebit,int i);         //call by keyBuild
void EncodeData(int *lData,int *rData,int *srt);        //encodedata function
void F(int *rData,int *key);                                       //F function
void Expand(int *rData,int *rDataP);                        //Expand function
void ExchangeS(int *rDataP,int *rData);                   //S-diagram change
void ExchangeP(int *rData);                                    //P change
void FillBin(int *rData,int n,int s);                             // data to binary;call by S-Diagram change function
void DecodeData(int *str,int *lData,int *rData);        //DecodeData from binary
int IP1[]={58, 50, 42, 34, 26, 18, 10, 2,  60, 52, 44, 36, 28, 20, 12, 4,    //initial change
           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 IP2[]={40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31,    //opp initial change
           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
 };
int s[][4][16]={{                                                                              //S-diagram array
                 {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},
                 {6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12}
                },
                {
                 {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}
                }
};
int Ex[48]={  32,1,2,3,4,5,                                                               //Expand array
              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 P[32]={16,7,20,21,                                                                //P-change
           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
 };
int PC1[56]={57,49,41,33,25,17,9,                                                //PC-1 in keyBuild
             1,58,50,42,34,26,18,
             10,2,59,51,43,35,27,
             19,11,3,60,52,44,36,
             63,55,47,39,31,33,15,
             7,62,54,46,38,30,22,
             14,6,61,53,45,37,29,
             21,13,5,28,20,12,4
 };
int PC2[48]={14,17,11,24,1,5,                                                     //PC-2 in keyBuild
             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
 };

 

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