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<?php |
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/** |
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* This file is part of the tiqr project. |
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* |
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* The tiqr project aims to provide an open implementation for |
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* authentication using mobile devices. It was initiated by |
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* SURFnet and developed by Egeniq. |
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* |
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* More information: http://www.tiqr.org |
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* |
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* @author Ivo Jansch <[email protected]> |
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* |
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* @package tiqr |
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* |
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* @license New BSD License - See LICENSE file for details. |
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* |
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* @copyright (C) 2010-2011 SURFnet BV |
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*/ |
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/** |
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* @internal includes |
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*/ |
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require_once("OATH/OCRAParser.php"); |
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require_once("Tiqr/Random.php"); |
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require_once("Tiqr/OATH/OCRA.php"); |
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/** |
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* A wrapper for the OCRA algorithm implementing just the features we support. |
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* @author ivo |
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*/ |
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class Tiqr_OCRAWrapper |
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{ |
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private $_ocraParser; |
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private $_ocraSuite; |
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public function __construct($ocraSuite) { |
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$this->_ocraSuite = $ocraSuite; |
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$this->_ocraParser = new OATH_OCRAParser($ocraSuite); |
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} |
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/** |
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* Generate a challenge string based on an ocraSuite |
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* @return String An OCRA challenge that matches the specification of |
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* the ocraSuite. |
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*/ |
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public function generateChallenge() |
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{ |
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return $this->_ocraParser->generateChallenge(); |
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} |
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/** |
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* Generate a session key based on an ocraSuite |
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* @return String Hexadecimal session key |
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*/ |
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public function generateSessionKey() |
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{ |
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return $this->_ocraParser->generateSessionInformation(); |
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} |
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/** |
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* Calculate an OCRA repsonse to a given OCRA challenge, according to |
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* the algorithm specified by an OCRA Suite. |
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* @param String $secret a hex representation of the user's secret |
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* @param String $challenge a hex or (alfa)numeric challenge question |
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* @param String $sessionKey a hex sessionKey identifying the current session |
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* @return String An OCRA response, the length of which is determined by the |
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* OCRA suite. |
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*/ |
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public function calculateResponse($secret, $challenge, $sessionKey) |
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{ |
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return OCRA::generateOCRA($this->_ocraSuite, $secret, "", $challenge, "", $sessionKey, ""); |
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} |
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/** |
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* Calculate and verify an OCRA response. |
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* @param String $response Expected OCRA response |
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* @param String $secret a hex representation of the user's secret |
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* @param String $challenge a hex or (alfa)numeric challenge question |
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* @param String $sessionKey the sessionKey identifying the current session |
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* @return Boolean True if response matches, false otherwise |
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*/ |
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public function verifyResponse($response, $secret, $challenge, $sessionKey) |
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{ |
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$expected = OCRA::generateOCRA($this->_ocraSuite, $secret, "", $challenge, "", $sessionKey, ""); |
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return $this->_ocraParser->constEqual($expected, $response); |
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} |
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} |
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Tiqr /
tiqr-server-libphp
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