Fuck. This. Crypto.

reader.c

    input_fd = open("key.dat", O_RDONLY);
    if(input_fd < 0) {
        fprintf(stderr, "failed to open data file\n");
        return 1;
    }

    lseek(input_fd, 38, SEEK_SET);
    memset(data, 0, 1024);
    have = read(input_fd, data, 1024);
    if(have < 100) {
        fprintf(stderr, "dont have enough data: %d\n", have);
        return 1;
    }
    lseek(input_fd, 30, SEEK_SET);
    err = read(input_fd, data+have, 4);
    if(err != 4) {
        fprintf(stderr, "read error, dunno what to do %d\n", err);
    }
    close(input_fd);