AngstromCTF 2016 - Endian of the World (binary, 40)

Source Code :

Indian.c

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

int main(int argc, char **argv)

{

printf("Since you're about to die anyway, I might as well tell you my secret!\n");

printf("A single password will halt my machine, but you'll never figure it out!\n\n");

size_t password_length = sizeof(uint32_t)*15 + 2;

char *buffer = calloc(1, password_length);

printf("Secret password: \n");

fgets(buffer, password_length, stdin);

uint32_t *ints = (uint32_t*) buffer;

if (ints[0]  == 0x6f645f61 && ints[1]  == 0x64736d6f && ints[2]  == 0x645f7961 &&

ints[3]  == 0x63697665 && ints[4]  == 0x73695f65 && ints[5]  == 0x6c6e6f5f &&

ints[6]  == 0x73755f79 && ints[7]  == 0x6c756665 && ints[8]  == 0x5f66695f &&

ints[9]  == 0x72657665 && ints[10] == 0x656e6f79 && ints[11] == 0x6f6e6b5f &&

ints[12] == 0x615f7377 && ints[13] == 0x74756f62 && ints[14] == 0x0a74695f)

{

printf("Grr, I'll be back!\n");

}

else

{

printf("Mwahaha! You fools will never stop me! How could the answer be\n");

printf("0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X 0x%08X?\n",

ints[0], ints[1], ints[2], ints[3], ints[4], ints[5], ints[6], ints[7], ints[8], ints[9], ints[10], ints[11],

ints[12], ints[13], ints[14]);

}

return 0;

}

Source to get the flag :

#include <stdint.h>

#include <stdio.h>

#include <stdlib.h>

int main(int argc, char **argv)

{

    int ints[15];

    ints[0]  = 0x6f645f61 ;

    ints[1]  = 0x64736d6f ;

    ints[2]  = 0x645f7961 ;

    ints[3]  = 0x63697665 ;

    ints[4]  = 0x73695f65 ;

    ints[5]  = 0x6c6e6f5f ;

    ints[6]  = 0x73755f79 ;

    ints[7]  = 0x6c756665 ;

    ints[8]  = 0x5f66695f ;

        ints[9]  = 0x72657665 ;

 ints[10] = 0x656e6f79 ;

 ints[11] = 0x6f6e6b5f ;

        ints[12] = 0x615f7377 ;

 ints[13] = 0x74756f62;

 ints[14] = 0x0a74695f;

 ints[15] = 0;

        printf("%s\n",ints);

    return 0;

}

the flag  :  a_doomsday_device_is_only_useful_if_everyone_knows_about_it