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Password storing/checking class. Keeping passwords safe.

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Nice implementation of Blowfish for storing user passwords to prevent decryption when for example the user database is compromised. Origin: Burak Guzel@Nettuts

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  1. //
  2. // PassHash.php (Utility class):
  3. //
  4. class PassHash {  
  5.  
  6.         // blowfish  
  7.         private static $algo = '$2a';  
  8.  
  9.         // cost parameter  
  10.         private static $cost = '$10';  
  11.  
  12.  
  13.         // mainly for internal use  
  14.         public static function unique_salt() {  
  15.             return substr(sha1(mt_rand()),0,22);  
  16.         }  
  17.  
  18.         // this will be used to generate a hash  
  19.         public static function hash($password) {  
  20.  
  21.             return crypt($password,  
  22.                         self::$algo .  
  23.                         self::$cost .  
  24.                         '$' . self::unique_salt());  
  25.  
  26.         }  
  27.  
  28.  
  29.         // this will be used to compare a password against a hash  
  30.         public static function check_password($hash, $password) {  
  31.  
  32.             $full_salt = substr($hash, 0, 29);  
  33.  
  34.             $new_hash = crypt($password, $full_salt);  
  35.  
  36.             return ($hash == $new_hash);  
  37.  
  38.         }  
  39.  
  40. }
  41.  
  42.  
  43.  
  44. ///////////////////////////////////////////////////////////////////
  45. //
  46. // Usage during registration (creating a new user record) :
  47. //
  48. ///////////////////////////////////////////////////////////////////
  49.  
  50. // include the class  
  51. require ("PassHash.php");  
  52.  
  53. // read all form input from $_POST  
  54. // ...  
  55.  
  56. // do your regular form validation stuff  
  57. // ...  
  58.  
  59. // hash the password  
  60. $pass_hash = PassHash::hash($_POST['password']);  
  61.  
  62. // store all user info in the DB, excluding $_POST['password']  
  63. // store $pass_hash instead  
  64. // ...    
  65.  
  66.  
  67.  
  68. ///////////////////////////////////////////////////////////////////
  69. //
  70. // Usage during login (checking the user record) :
  71. //
  72. ///////////////////////////////////////////////////////////////////
  73.  
  74. // include the class  
  75. require ("PassHash.php");  
  76.  
  77. // read all form input from $_POST  
  78. // ...  
  79.  
  80. // fetch the user record based on $_POST['username']  or similar  
  81. // ...  
  82.  
  83. // check the password the user tried to login with  
  84. if (PassHash::check_password($user['pass_hash'], $_POST['password'])) {  
  85.      // grant access  
  86.      // ...  
  87. } else {  
  88.      // deny access  
  89.      // ...  
  90. }

URL: http://net.tutsplus.com/tutorials/php/understanding-hash-functions-and-keeping-passwords-safe/

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