将一个异或加密方案制作成dll

#include <stdio.h> #include <stdlib.h> #include <string.h> char encrypt( char f , char c) { return f^c; } _declspec(dllexport) int OutEncrypt( char *FilePath, char *SecretWord ) { FILE * fp ; FILE * fp1; char *p= FilePath , *s= SecretWord; //char fn[128], *p = fn, ps[10], *s = ps; //fn[128]存放加密文件路径，ps[10]存放密码 char ch; char *tm = "C:\\temp.temp"; //存放临时文件 if(( fp = fopen(p,"rb") )== NULL || ( fp1 = fopen(tm,"wb") ) == NULL ) { return 0; //加密失败 } ch = fgetc(fp); while( !feof(fp) ) { s = SecretWord; while( *s != '\0' ) { ch = encrypt( ch, *s++ ); fputc( ch, fp1 ); ch = fgetc(fp); } } fclose( fp ); fclose( fp1); remove(p); rename(tm, p); return 1; //加密成功 }