<?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 { /** * HOTP - One time password generator * * The HOTP class allow for the generation * and verification of one-time password using * the HOTP 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 HOTP extends OTP { /** * Get the password for a specific counter value * @param integer $count the counter which is used to * seed the hmac hash function. * @return integer the One Time Password */ public function at($count) { return $this->generateOTP($count); } /** * Verify if a password is valid for a specific counter value * * @param integer $otp the one-time password * @param integer $counter the counter value * @return bool true if the counter is valid, false otherwise */ public function verify($otp, $counter) { return ($otp == $this->at($counter)); } /** * Returns the uri for a specific secret for hotp method. * Can be encoded as a image for simple configuration in * Google Authenticator. * * @param string $name the name of the account / profile * @param integer $initial_count the initial counter * @return string the uri for the hmac secret */ public function provisioning_uri($name, $initial_count) { return "otpauth://hotp/".urlencode($name)."?secret={$this->secret}&counter=$initial_count"; } } }