2016/advent5.c

   1 #define _GNU_SOURCE 1
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include "md5.h"
   7
   8 int main(int argc, char **argv) {
   9   if (argc != 2)
  10     return 1;
  11   unsigned char sum[16];
  12   int i = 0;
  13   char out[9] = "________";
  14   while (strchr (out, '_')) {
  15     if (!(++i % 10000))
  16       printf ("\b\b\b\b\b\b\b\b\b\b\b %d", i);
  17     char *str;
  18     int len = asprintf(&str, "%s%d", argv[1], i);
  19     md5_buffer(str, len, sum);
  20     if (!(sum[0] | sum[1]) && sum[2] <= 0xf) {
  21       if (out[sum[2]] == '_')
  22         out[sum[2]] = "0123456789abcdef"[sum[3] >> 4];
  23       printf ("\n%s potential match on %s\n", out, str);
  24     }
  25   }
  26   printf ("final password: %s\n", out);
  27   return 0;
  28 }