AuthYubico.php

<?php
namespace Library\Authentication;

  /**
   * Class for verifying Yubico One-Time-Passcodes
   *
   * @category    Auth
   * @package     Auth_Yubico
   * @author      Simon Josefsson <simon@yubico.com>, Olov Danielson <olov@yubico.com>
   * @copyright   2007-2015 Yubico AB
   * @license     http://opensource.org/licenses/bsd-license.php New BSD License
   * @version     2.0
   * @link        http://www.yubico.com/
   */
require_once 'PEAR.php';



/**
 * Class for verifying Yubico One-Time-Passcodes
 *
 * Simple example:
 * <code>
 * require_once 'Auth/Yubico.php';
 * $otp = "ccbbddeertkrctjkkcglfndnlihhnvekchkcctif";
 *
 * # Generate a new id+key from https://api.yubico.com/get-api-key/
 * $yubi = new Auth_Yubico('42', 'FOOBAR=');
 * $auth = $yubi->verify($otp);
 * if (PEAR::isError($auth)) {
 *    print "<p>Authentication failed: " . $auth->getMessage();
 *    print "<p>Debug output from server: " . $yubi->getLastResponse();
 * } else {
 *    print "<p>You are authenticated!";
 * }
 * </code>
 */
class AuthYubico
{
	/**#@+
	 * @access private
	 */

	/**
	 * Yubico client ID
	 * @var string
	 */
	var $_id;

	/**
	 * Yubico client key
	 * @var string
	 */
	var $_key;

	/**
	 * URL part of validation server
	 * @var string
	 */
	var $_url;

	/**
	 * List with URL part of validation servers
	 * @var array
	 */
	var $_url_list;

	/**
	 * index to _url_list
	 * @var int