yihuo.cpp

简单的异或加密

#include<stdio.h>

void main(int argc, char* argv[])
{
	FILE* fi, *fo;
	char* cp;
	int c;

	if((cp=argv[1]) && *cp!='\0')
	{
		if((fi=fopen(argv[2], "rb"))!=NULL)
		{
			if((fo=fopen(argv[3], "wb"))!=NULL)
			{
				while((c=getc(fi))!=EOF)
				{
					if(!*cp)
						cp = argv[1];
					c^= *(cp++);
					putc(c, fo);
				}
				fclose(fo);
			}
			fclose(fi);
		}
	}
}