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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 {
- /**
- * 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";
- }
- }
- }
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