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  1. #include <stdio.h>
  2. #include <string.h>
  3. unsigned long hashcode = 0x21DD09EC;                            unsigned long check_password(const char* p){
  4.         int* ip = (int*)p;                                              int i;
  5.         int res=0;
  6.         for(i=0; i<5; i++){
  7.                 res += ip[i];
  8.         }
  9.         return res;
  10. }
  11.  
  12. int main(int argc, char* argv[]){
  13.         if(argc<2){
  14.                 printf("usage : %s [passcode]\n", argv[0]);
  15.                 return 0;
  16.         }
  17.         if(strlen(argv[1]) != 20){
  18.                 printf("passcode length should be 20 bytes\n");
  19.                 return 0;
  20.         }
  21.  
  22.         if(hashcode == check_password( argv[1] )){
  23.                 system("/bin/cat flag");
  24.                 return 0;
  25.         }
  26.         else
  27.                 printf("wrong passcode.\n");
  28.         return 0;
  29. }
Success #stdin #stdout 0.01s 5280KB
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usage : ./prog [passcode]
https://ideone.com/OUoW7L
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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