EDS加密算法源码

#include "stdio.h"
#include "memory.h"
#include "time.h"
#include "stdlib.h"

#define PLAIN_FILE_OPEN_ERROR -1
#define KEY_FILE_OPEN_ERROR -2
#define CIPHER_FILE_OPEN_ERROR -3
#define OK 1

typedef char ElemType;




//初始置换表IP
int IP_Table[64] = {  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,
56,48,40,32,24,16,8,0,
58,50,42,34,26,18,10,2,
60,52,44,36,28,20,12,4,
62,54,46,38,30,22,14,6};
//逆初始置换表IP^-1
int IP_1_Table[64] = {39,7,47,15,55,23,63,31,
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,
32,0,40,8,48,16,56,24};

//扩充置换表E
int E_Table[48] = {31, 0, 1, 2, 3, 4,
3,  4, 5, 6, 7, 8,
7,  8,9,10,11,12,
11,12,13,14,15,16,
15,16,17,18,19,20,
19,20,21,22,23,24,
23,24,25,26,27,28,
27,28,29,30,31, 0};

//置换函数P
int P_Table[32] = {15,6,19,20,28,11,27,16,
0,14,22,25,4,17,30,9,
1,7,23,13,31,26,2,8,
18,12,29,5,21,10,3,24};

//S盒
int S[8][4][16] =//S1
{{{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}},
//S2
{{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}},
//S3
{{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}},
//S4
{{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}},
//S5
{{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}},
//S6
{{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}},
//S7
{{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}},
//S8
{{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}}};
//置换选择1
int PC_1[56] = {56,48,40,32,24,16,8,
0,57,49,41,33,25,17,
9,1,58,50,42,34,26,
18,10,2,59,51,43,35,
62,54,46,38,30,22,14,
6,61,53,45,37,29,21,
13,5,60,52,44,36,28,
20,12,4,27,19,11,3};

//置换选择2
int PC_2[48] = {13,16,10,23,0,4,2,27,
14,5,20,9,22,18,11,3,
25,7,15,6,26,19,12,1,
40,51,30,36,46,54,29,39,
50,44,32,46,43,48,38,55,
33,52,45,41,49,35,28,31};

//对左移次数的规定
int MOVE_TIMES[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};



int ByteToBit(ElemType ch,ElemType bit[8]);
int BitToByte(ElemType bit[8],ElemType *ch);
int Char8ToBit64(ElemType ch[8],ElemType bit[64]);
int Bit64ToChar8(ElemType bit[64],ElemType ch[8]);
int DES_MakeSubKeys(ElemType key[64],ElemType subKeys[16][48]);
int DES_PC1_Transform(ElemType key[64], ElemType tempbts[56]);
int DES_PC2_Transform(ElemType key[56], ElemType tempbts[48]);
int DES_ROL(ElemType data[56], int time);
int DES_IP_Transform(ElemType data[64]);
int DES_IP_1_Transform(ElemType data[64]);
int DES_E_Transform(ElemType data[48]);
int DES_P_Transform(ElemType data[32]);
int DES_SBOX(ElemType data[48]);
int DES_XOR(ElemType R[48], ElemType L[48],int count);
int DES_Swap(ElemType left[32],ElemType right[32]);
int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]);
int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48], ElemType plainBlock[8]);
int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile);
    int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile);




	    //字节转换成二进制
    int ByteToBit(ElemType ch, ElemType bit[8]){
        int cnt;
        for(cnt = 0;cnt < 8; cnt++){
            *(bit+cnt) = (ch>>cnt)&1;
        }
        return 0;
    }

    //二进制转换成字节
    int BitToByte(ElemType bit[8],ElemType *ch){
        int cnt;
        for(cnt = 0;cnt < 8; cnt++){
            *ch |= *(bit + cnt)<>3;
            data[cur2+1] = (output&0X04)>>2;
            data[cur2+2] = (output&0X02)>>1;
            data[cur2+3] = output&0x01;
        }
        return 0;
    }

    //交换
    int DES_Swap(ElemType left[32], ElemType right[32]){
        ElemType temp[32];
        memcpy(temp,left,32);
        memcpy(left,right,32);
        memcpy(right,temp,32);
        return 0;
    }

    //加密单个分组
    int DES_EncryptBlock(ElemType plainBlock[8], ElemType subKeys[16][48], ElemType cipherBlock[8]){
        ElemType plainBits[64];
        ElemType copyRight[48];
        int cnt;

        Char8ToBit64(plainBlock,plainBits);
        //初始置换（IP置换）
        DES_IP_Transform(plainBits);

        //16轮迭代
        for(cnt = 0; cnt < 16; cnt++){
            memcpy(copyRight,plainBits+32,32);
            //将右半部分进行扩展置换，从32位扩展到48位
            DES_E_Transform(copyRight);
            //将右半部分与子密钥进行异或操作
            DES_XOR(copyRight,subKeys[cnt],48);
            //异或结果进入S盒，输出32位结果
            DES_SBOX(copyRight);
            //P置换
            DES_P_Transform(copyRight);
            //将明文左半部分与右半部分进行异或
            DES_XOR(plainBits,copyRight,32);
            if(cnt != 15){
                //最终完成左右部的交换
                DES_Swap(plainBits,plainBits+32);
            }
        }
        //逆初始置换（IP^1置换）
        DES_IP_1_Transform(plainBits);
        Bit64ToChar8(plainBits,cipherBlock);
        return 0;
    }

    //解密单个分组
    int DES_DecryptBlock(ElemType cipherBlock[8], ElemType subKeys[16][48],ElemType plainBlock[8]){
        ElemType cipherBits[64];
        ElemType copyRight[48];
        int cnt;

        Char8ToBit64(cipherBlock,cipherBits);
        //初始置换（IP置换）
        DES_IP_Transform(cipherBits);

        //16轮迭代
        for(cnt = 15; cnt >= 0; cnt--){
            memcpy(copyRight,cipherBits+32,32);
            //将右半部分进行扩展置换，从32位扩展到48位
            DES_E_Transform(copyRight);
            //将右半部分与子密钥进行异或操作
            DES_XOR(copyRight,subKeys[cnt],48);
            //异或结果进入S盒，输出32位结果
            DES_SBOX(copyRight);
            //P置换
            DES_P_Transform(copyRight);
            //将明文左半部分与右半部分进行异或
            DES_XOR(cipherBits,copyRight,32);
            if(cnt != 0){
                //最终完成左右部的交换
                DES_Swap(cipherBits,cipherBits+32);
            }
        }
        //逆初始置换（IP^1置换）
        DES_IP_1_Transform(cipherBits);
        Bit64ToChar8(cipherBits,plainBlock);
        return 0;
    }

    //加密文件
    int DES_Encrypt(char *plainFile, char *keyStr,char *cipherFile){
        FILE *plain,*cipher;
        int count,tot;
        ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
        ElemType bKey[64];
        ElemType subKeys[16][48];
        if((plain = fopen(plainFile,"rb")) == NULL){
            return PLAIN_FILE_OPEN_ERROR;
        }
        if((cipher = fopen(cipherFile,"wb")) == NULL){
            return CIPHER_FILE_OPEN_ERROR;
        }
        //设置密钥
        memcpy(keyBlock,keyStr,8);
        //将密钥转换为二进制流
        Char8ToBit64(keyBlock,bKey);
        //生成子密钥
        DES_MakeSubKeys(bKey,subKeys);

        tot = 0;
        while(!feof(plain)){
            //每次读8个字节，并返回成功读取的字节数
            if((count = fread(plainBlock,sizeof(char),8,plain)) == 8){
                DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
                    fwrite(cipherBlock,sizeof(char),8,cipher);
            }
        }
        if(count){
            //填充
            memset(plainBlock + count,'\0',7 - count);
            //最后一个字符保存包括最后一个字符在内的所填充的字符数量
            plainBlock[7] = 8 - count;
            DES_EncryptBlock(plainBlock,subKeys,cipherBlock);
            fwrite(cipherBlock,sizeof(char),8,cipher);
        }
        fclose(plain);
        fclose(cipher);
        return OK;
    }

    //解密文件
    int DES_Decrypt(char *cipherFile, char *keyStr,char *plainFile){
        FILE *plain, *cipher;
        int count = 0;
        long fileLen;
        ElemType plainBlock[8],cipherBlock[8],keyBlock[8];
        ElemType bKey[64];
        ElemType subKeys[16][48];
        if((cipher = fopen(cipherFile,"rb")) == NULL){
            return CIPHER_FILE_OPEN_ERROR;
        }
        if((plain = fopen(plainFile,"wb")) == NULL){
            return PLAIN_FILE_OPEN_ERROR;
        }

        //设置密钥
        memcpy(keyBlock,keyStr,8);
        //将密钥转换为二进制流
        Char8ToBit64(keyBlock,bKey);
        //生成子密钥
        DES_MakeSubKeys(bKey,subKeys);

        //取文件长度
        fseek(cipher,0,SEEK_END);   //将文件指针置尾
        fileLen = ftell(cipher);
        if(fileLen%8)    //密文的字节数一定是8的整数倍,否则出错
            return 1;
        rewind(cipher);             //将文件指针重指向文件头

        do{
            fread(cipherBlock,sizeof(char),8,cipher);
            DES_DecryptBlock(cipherBlock,subKeys,plainBlock);

            fwrite(plainBlock,sizeof(char),8,plain);

        }while(!feof(cipher));

        for(int i=6;i>0;i--)
        {
            if(plainBlock[i]=='\0')
                ++count;
            else
                break;
        }

        if(plainBlock[7]==count+1){//有填充
            fwrite(plainBlock,sizeof(char),8 - plainBlock[7],plain);
        }
        else{//无填充
            fwrite(plainBlock,sizeof(char),8,plain);
        }

        fclose(plain);
        fclose(cipher);
        return OK;
    }

  //  最后，写一个简单的main函数来检验它：   C代码  收藏代码

    int main()
    {
        clock_t a,b;
        a = clock();
        DES_Encrypt("le.jpg","deskey.txt","aaa.jpg");
        b = clock();
        printf("加密消耗%d毫秒\n",b-a);

        //system("pause");
        a = clock();
        DES_Decrypt("aaa.jpg","deskey.txt","bbb.jpg");
        b = clock();
        printf("解密消耗%d毫秒\n",b-a);
        system("pause");
        return 0;
    }

本程序代码在GCC下编译通过，且在win32上正确运行