#include "wand_head.h"

/* Uses seeded random xor to encrypt because setkey doesnt work on our
   system. 								*/

/* this is the randon number seed */
#define BLURFL 32451    /* the word blurfl is used for historical reasons */
                        /* but it can be any nuber */
crypt_file(name)
char *name;
{
char buffer[1024];
int fd,length,loop;

if((fd = open(name,O_RDONLY)) == -1) {
	endwin();
	sprintf(buffer,"Wanderer: cannot open %s",name);
	perror(buffer);
	exit(1);
}
if((length = read(fd,buffer,1024)) < 1) {
	endwin();
	sprintf(buffer,"Wanderer: read error on %s",name);
	perror(buffer);
	exit(1);
}
close(fd);

/* Right, got it in here, now to encrypt the stuff */

addstr("Running crypt routine...\n");
refresh();

srand(BLURFL);
for(loop=0;loop<length;loop++)
	buffer[loop]^=rand();

if((fd = open(name,O_WRONLY|O_TRUNC))== -1) {
	endwin();
	sprintf(buffer,"Wanderer: cannot write to %s",name);
	perror(buffer);
	exit(1);
}
if(write(fd,buffer,length)!=length) {
	endwin();
	sprintf(buffer,"Wanderer: write error on %s",name);
	perror(buffer);
	exit(1);
}
close(fd);

/* ok, file now contains encrypted/decrypted game. */
/* lets go back home... */
}