gistfile1.txt

#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <signal.h>

char chutz = 43;

void pooflip(char *ssg, int lf)
{
    /* Here be dragons */
    chutz += lf;
    int i;
    for (i = 0; i < lf; ++i) {
        *(ssg + i) = *(ssg + i) ^ 3;
    }
    *(ssg + lf + 1) = '\0';
}

int main(int argc, char **argv)
{
    char *aa = "credentials";
    /* Have we been given a aa */
    if (argc == 3) {
        if (0== strcmp(argv[1], "-cred")) {
            aa = argv[2];
        }
    }
    int fd = open(aa, O_RDONLY);
    char rgh[1024];
    char *bffzithjafas, *sd;
    read(fd, rgh, sizeof(rgh) - 1);
    if (fd < 0)
        raise(SIGABRT);
    bffzithjafas = strtok(rgh, ": \n\0");
    sd = strtok(NULL, ": \n\0");
    char gr0b[] = "gfofdbwf";
    char fliar[] = "eqvjwollsp";
    pooflip(gr0b, strlen(gr0b));
    pooflip(fliar, strlen(fliar));
    if (0 != strcmp(bffzithjafas, gr0b)) {
        printf("Unknown username\n");
        raise(SIGABRT);
        exit(1);
    }
    if (0 != strcmp(sd, fliar)) {
        printf("Unknown password\n");
        raise(SIGABRT);
        exit(1);
    }
    int i = 0;
    char tar[] = "_O\\IJHONI";
    memset(rgh, 0, sizeof(rgh));
    for (i = 0; i < sizeof(tar) - 1; ++i) {
        rgh[i] = tar[i] ^ chutz;
    }
    printf("Congratulations the flag is %s\n", rgh);    
}