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  1. <?php
  2.  
  3. // debug
  4. set_error_handler(function ($errno, $errstr, $errfile, $errline ) {
  5.     throw new ErrorException($errstr, $errno, 0, $errfile, $errline);
  6. });
  7.  
  8. $charset = "abcdefghijklmnopqrstuvwxyz0123456789";
  9. $alphabet = PassCracker::createAlphabet($charset);
  10. $hash = "e7806b130b429fc9b5890608a2c60675";
  11.  
  12. $cracker = new PassCracker(4, $alphabet, false);
  13. $answer = $cracker->crack($hash);
  14. echo $answer !== null ? 
  15.     "Answer is $answer\n" : 
  16.     "This time we're out of luck. Try googling: http://google.com/?q=$hash\n";
  17.  
  18. class PassCracker
  19. {
  20.     private $length;
  21.     private $alphabet;
  22.  
  23.     private $passwordIndexes;
  24.     private $passwordLetters;
  25.  
  26.     public function __construct($length, array $alphabet)
  27.     {
  28.         $this->length = $length;
  29.         $this->alphabet = $alphabet;
  30.     }
  31.  
  32.     public static function createAlphabet($string)
  33.     {
  34.         return preg_split("//u", $string, null, PREG_SPLIT_NO_EMPTY);
  35.     }
  36.  
  37.     private function initCode()
  38.     {
  39.         $this->passwordIndexes = array_fill(0, $this->length, 0);
  40.         $this->generatePassword();
  41.     }
  42.  
  43.     private function generatePassword()
  44.     {
  45.         $this->passwordLetters = array_map(function ($index) {
  46.             return $this->alphabet[$index];
  47.         }, $this->passwordIndexes);
  48.     }
  49.  
  50.     public function crack($hash)
  51.     {
  52.         $this->initCode();
  53.         $hash = mb_strtolower(trim($hash)); // everything might happen
  54.  
  55.         do {
  56.  
  57.             $password = implode('', $this->passwordLetters);
  58.             if (md5($password) == $hash) {
  59.                 return $password;
  60.             }            
  61.  
  62.             if (!$this->generateNextCode()) {
  63.                 return null;
  64.             };
  65.  
  66.         } while (true);
  67.  
  68.     }
  69.  
  70.     private function generateNextCode() {
  71.         $max = count($this->alphabet);
  72.         for ($pos = $this->length - 1; $pos >= 0; $pos--) {
  73.  
  74.             $newIndex = $this->passwordIndexes[$pos] = ($this->passwordIndexes[$pos] + 1) % $max;
  75.             $this->passwordLetters[$pos] = $this->alphabet[$newIndex];
  76.  
  77.             if ($newIndex > 0) {
  78.                 return true;
  79.             }
  80.         }
  81.  
  82.         // No more tries
  83.         return false;
  84.     }
  85. }
  86.  
Success #stdin #stdout 2.04s 20520KB
comments (?)
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Standard input is empty
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Answer is omsk
https://ideone.com/YLqGSf
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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