encrypt.c

/* File encrypt.c */

#include "wand_head.h"
#ifndef __CONVERT
#include <curses.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

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

void crypt_file(char *name)
{
    char buffer[1024];
    int fd, length, loop;

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

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

#ifndef __CONVERT
    addstr("Running crypt routine....\n");
    refresh();
#endif

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

    if ((fd = open(name, O_WRONLY | O_TRUNC)) == -1)
    {
#ifndef __CONVERT
        endwin();
#endif
        sprintf(buffer, "Wanderer: cannot write to %s", name);
        perror(buffer);
        exit(1);
    }
    if (write(fd, buffer, length) != length)
    {
#ifndef __CONVERT
        endwin();
#endif
        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... */
}