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<?php/* * Copyright (c) 2011 Le Lag * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */namespace OTPHP { /** * TOTP - One time password generator * * The TOTP class allow for the generation * and verification of one-time password using * the TOTP specified algorithm. * * This class is meant to be compatible with * Google Authenticator * * This class was originally ported from the rotp * ruby library available at https://github.com/mdp/rotp */ class TOTP extends OTP { /** * The interval in seconds for a one-time password timeframe * Defaults to 30 * @var integer */ public $interval; public function __construct($s, $opt = Array()) { $this->interval = isset($opt['interval']) ? $opt['interval'] : 30; parent::__construct($s, $opt); } /** * Get the password for a specific timestamp value * * @param integer $timestamp the timestamp which is timecoded and * used to seed the hmac hash function. * @return integer the One Time Password */ public function at($timestamp) { return $this->generateOTP($this->timecode($timestamp)); } /** * Get the password for the current timestamp value * * @return integer the current One Time Password */ public function now() { return $this->generateOTP($this->timecode(time())); } /** * Verify if a password is valid for a specific counter value * * @param integer $otp the one-time password * @param integer $timestamp the timestamp for the a given time, defaults to current time. * @return bool true if the counter is valid, false otherwise */ public function verify($otp, $timestamp = null) { if($timestamp === null) $timestamp = time(); return ($otp == $this->at($timestamp)); } /** * Returns the uri for a specific secret for totp method. * Can be encoded as a image for simple configuration in * Google Authenticator. * * @param string $name the name of the account / profile * @return string the uri for the hmac secret */ public function provisioning_uri($name) { } /** * Transform a timestamp in a counter based on specified internal * * @param integer $timestamp * @return integer the timecode */ protected function timecode($timestamp) { return (int)( (((int)$timestamp * 1000) / ($this->interval * 1000))); } }} |
