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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) {
return "otpauth://totp/".urlencode($name)."?secret={$this->secret}";
}
/**
* 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)));
}
}
}
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