C++ 二进制文件异或加密简单示例

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增大字体作者：佚名来源：本站整理发布时间：2011-03-07 17:58:37

C++ 使用异或算法加密二进制文件，编译后通过命令行输入：

编译文件.exe 加密文件路径.exe 密钥

即可加密，解密方法就是再执行一次加密就解开了。

C/C++ code复制代码

#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char* argv[])
{
    int i,count,len;
    char buff[1024];
    static char tmpfile[]="~u~0_sw~.f~l";
    FILE * in , * out ;
   
    if(argc <3)
    {
        printf("Less Parameter !\n");
        printf("Parameter number must at least 2 !!\n");
        return 1;
    }
   
    len =strlen(argv[2]);
    in =fopen(argv[1],"rb");
    out =fopen(tmpfile,"wb"); /* creat a temp file */
   
    if(in==NULL)
    {
        printf("Input File \'%s\' not found !!\n",argv[1]);
        exit(1);
    }
    if(out==NULL)
    {
        printf("Can not creat temp file \'%s\'\n",tmpfile);
        exit(2);
    }
   
    while( !feof(in) )
    {
        count=fread(buff,1,1024,in);
        for(i=0;i <count;i++)
            buff[i]^=argv[2][i%len];
        fwrite(buff,1,count,out);
    }
   
    fclose(in);
    fclose(out);
    remove(argv[1]);
    rename(tmpfile,argv[1]);
    return 0;
}