需求：以DWORD为单位对文件进行加密，将每个DWORD与0xfcba0000做异或，写入另一个文件
解答：
#include #include 
{
FILE hSource; FILE hDestination; DWORD dwKey =0xfcba0000 ;char pbBuffer; DWORD dwBufferLen =sizeof (DWORD); DWORD dwCount; DWORD dwData;if (argv[1 ]==0 ||argv[2 ]==0 )
{ printf(“missing argument!\n “);return false ;
}char szSource =argv[1 ];char szDestination =argv[2 ]; hSource =fopen(szSource,”rb “);//打开源文件.hDestination =fopen(szDestination,”wb “);//打开目标文件if (hSource ==NULL){printf(“open Source File error !”);return false ;}if (hDestination ==NULL){ printf(“open Destination File error !”);return false ;}//分配缓冲区pbBuffer =(char )malloc(dwBufferLen);do {//从源文件中读出dwBlockLen个字节dwCount =fread(pbBuffer,1 , dwBufferLen, hSource);//加密数据dwData =(DWORD )pbBuffer;//char TO dword dwData ^=dwKey;//xor operation pbBuffer =(char *)&dwData;//将加密过的数据写入目标文件fwrite(pbBuffer,1 , dwCount, hDestination); }while (!feof(hSource));//关闭文件、释放内存fclose(hSource); fclose(hDestination); printf(“%s is encrypted to %s\n “,szSource,szDestination);return 0 ;
}
心得：
char转DWORD：dwData = (DWORD*)pbBuffer;
DWORD转char：pbBuffer = (char ) &dwData;
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Original: https://www.cnblogs.com/tonyqus/archive/2007/10/09/918191.html
Author: 找事的狐狸
Title: 文件加密的简单实现(C语言)
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