class Phpass extends CApplicationComponent
{
    // Path to the phpass library
    public $libPath = 'application.vendors.phpass.PasswordHash';

    // Do we require the hashes to be portable to older systems? This is less secure. (This requires PHP 5.3 or Suhosion.)
    public $hashPortable = false;

    // Base-2 logarithm of the iteration count used for password stretching
    public $hashCostLog2 = 10;

    public function init()
    {
        $lib = Yii::getPathOfAlias($this->libPath) . '.php';
        if (!file_exists($lib)) {
            Yii::log("phpass lib not found ($lib)!", CLogger::LEVEL_WARNING, 'Phpass');
            throw new CHttpException(500, "phpass lib not found ($lib)!");
        }

        Yii::import($this->libPath, true);

        return parent::init();
    }

    // Reset PasswordHash to generate a new random state
    private function _getHasher()
    {
        return new PasswordHash($this->hashCostLog2, $this->hashPortable);
    }

    public function getHash($password)
    {
        $hash = $this->_getHasher()->HashPassword($password);

        if (strlen($hash) < 20)
            throw new CHttpException(500, 'Problem hashing password, please contact support.');

        return $hash;
    }

    public function compare($password, $hash)
    {
        return $this->_getHasher()->CheckPassword($password, $hash);
    }
}