Daddy told me about cool MD5 hash collision today.

I wanna do something like that too!

ssh col@pwnable.kr -p2222 (pw:guest)

 #include <stdio.h>

 #include <string.h>

 unsigned long hashcode = 0x21DD09EC;

 unsigned long check_password(const char* p){

     int* ip = (int*)p;

     int i;

     int res=;

     for(i=; i<; i++){

         res += ip[i];

     }

     return res;

 }

 int main(int argc, char* argv[]){

     if(argc<){

         printf("usage : %s [passcode]\n", argv[]);

         return ;

     }

     if(strlen(argv[]) != ){

         printf("passcode length should be 20 bytes\n");

         return ;

     }

     if(hashcode == check_password( argv[] )){

         system("/bin/cat flag");

         return ;

     }

     else

         printf("wrong passcode.\n");

     return ;

 }