身份验证方法:
/**
 * Authenticate user with specified identity and credential
 *
 * most used case is authenticate user inline in script
 *
 * @param string $identity
 * @param string $credential
 * @return Zend_Auth_Result
 */
public function authenticate ($identity, $credential)
{
    $auth = Zend_Auth::getInstance();
    $adapter = $this->getAdapter();
    $adapter->setIdentity($identity)
            ->setCredential(self::passwordHash($credential));
    $config = Singular_Runtime::extract('config');
    $isActiveCol = $config->resources->auth->columns->is_active;
    $isActiveAllowVal = $config->resources->auth->is_active->allow_value;
    /**
     * @see APPLICATION_PATH/configs/application.ini -> resources.auth
     */
    if (null != $isActiveCol && null != $isActiveAllowVal) {
        $adapter->getDbSelect()->where("{$isActiveCol} = ?", $isActiveAllowVal);
    }
    Singular_Event::dispatch('beforeAuth', array(
        'auth' => $auth, 'adapter' => $adapter
    ));
    $result = $auth->authenticate($adapter);
    if ($result->isValid()) {
        $auth->getStorage()->write($adapter->getResultRowObject());
        Singular_Event::dispatch('afterAuth', array(
            'auth' => $auth, 'adapter' => $adapter
        ));
    }
    return $result;
}
和密码哈希生成方法:
/**
 * Password hash generator
 *
 * @static
 * @param  string $password
 * @return string
 */
public static function passwordHash ($password)
{
    $password = strtolower($password);
    return md5(
        str_repeat(
            md5($password) . strrev($password) . sha1($password),
            strlen($password)
        )
    );
}