VanillaIdentity (standalone)

gistfile1.txt

<?php
/**
 * @copyright Vanilla Forums Inc.
 * @license GNU GPL2
 */

/**
 * Instantiating this class will store current user's ID from cookie as $this->UserID.
 */
class VanillaIdentity {

   # Copy these from Vanilla config
   public $CookieName = 'Vanilla';
   public $CookieSalt = ''; 
   public $CookieHashMethod = 'md5';
   public $UserID = 0;
   
   /**
    * Returns the unique id assigned to the user in the database (retrieved
    * from the session cookie if the cookie authenticates) or FALSE if not
    * found or authentication fails.
    *
    * @return int
    */
   public function __construct() {         
      if (!$this->_CheckCookie($this->CookieName)) return 0;
      
      list($UserID, $Expiration) = $this->GetCookiePayload($this->CookieName);
      
      if (!is_numeric($UserID) || $UserID < -2) // allow for handshake special id
         $this->UserID = 0;
      else
         $this->UserID = $UserID;
   }

   public static function GetCookiePayload($CookieName) {
      if (!self::CheckCookie($CookieName)) return FALSE;
      
      $Payload = explode('|', $_COOKIE[$CookieName]);
      
      // Get rid of check fields like HashKey, HMAC and Time
      array_shift($Payload);
      array_shift($Payload);
      array_shift($Payload);
      
      return $Payload;
   }
   
   protected function _CheckCookie($CookieName) {
      return self::CheckCookie($CookieName);
   }

   public static function CheckCookie($CookieName) {
   
      if (empty($_COOKIE[$CookieName])) {
         return FALSE;
      }
      
      $CookieHashMethod = $this->CookieHashMethod;
      $CookieSalt = $this->CookieSalt;
      
      $CookieData = explode('|', $_COOKIE[$CookieName]);
      if (count($CookieData) < 5) {
         return FALSE;
      }
         
      list($HashKey, $CookieHash, $Time, $UserID, $Expiration) = $CookieData;
      if ($Expiration < time() && $Expiration != 0) {
         return FALSE;
      }
      
      $Key = self::_Hash($HashKey, $CookieHashMethod, $CookieSalt);
      $GeneratedHash = self::_HashHMAC($CookieHashMethod, $HashKey, $Key);

      if ($CookieHash != $GeneratedHash) {
         return FALSE;
      }
      
      return TRUE;
   }
   
   /**
    * Returns $this->_HashHMAC with the provided data, the default hashing method
    * (md5), and the server's COOKIE.SALT string as the key.
    *
    * @param string $Data The data to place in the hash.
    */
   protected static function _Hash($Data, $CookieHashMethod, $CookieSalt) {
      return Gdn_CookieIdentity::_HashHMAC($CookieHashMethod, $Data, $CookieSalt);
   }
   
   /**
    * Returns the provided data hashed with the specified method using the
    * specified key.
    *
    * @param string $HashMethod The hashing method to use on $Data. Options are MD5 or SHA1.
    * @param string $Data The data to place in the hash.
    * @param string $Key The key to use when hashing the data.
    */
   protected static function _HashHMAC($HashMethod, $Data, $Key) {
      $PackFormats = array('md5' => 'H32', 'sha1' => 'H40');

      if (!isset($PackFormats[$HashMethod]))
         return false;

      $PackFormat = $PackFormats[$HashMethod];
      // this is the equivalent of "strlen($Key) > 64":
      if (isset($Key[63]))
         $Key = pack($PackFormat, $HashMethod($Key));
      else
         $Key = str_pad($Key, 64, chr(0));

      $InnerPad = (substr($Key, 0, 64) ^ str_repeat(chr(0x36), 64));
      $OuterPad = (substr($Key, 0, 64) ^ str_repeat(chr(0x5C), 64));

      return $HashMethod($OuterPad . pack($PackFormat, $HashMethod($InnerPad . $Data)));
   }

}

Thx alot. I've corrected 2 Typos and changed it a bit to use the Vanilla Config files:

https://gist.github.com/MDMW/5147632