des_encode.h

des源码 我学c语言做的 望多多支持 八位输入 文件输出 文件输入 八位输出

 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初等变换,它们的作用在于明文的ASC码的划分关系,并且将原来明文的第8 16 24 32 40 48 56 64 位变成IP的输出的一个字节
           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初等变换的逆变换
           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 F函数是DES算法中最重要的部分 而其中的重点又在S盒上
                 {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 从1到63没有 8 16 24 32 40 48 56 64这几个数,实际密匙只有56位
             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
 };