des_encode.h

DES加密系统的C语言源代码 用C语言实现 欢迎下载

 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
 };