60 lines
1.8 KiB
PHP
60 lines
1.8 KiB
PHP
<?php
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/**
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* @author Lukas Reschke <lukas@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OC\Security;
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class StringUtils {
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/**
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* Compares whether two strings are equal. To prevent guessing of the string
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* length this is done by comparing two hashes against each other and afterwards
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* a comparison of the real string to prevent against the unlikely chance of
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* collisions.
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*
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* Be aware that this function may leak whether the string to compare have a different
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* length.
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*
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* @param string $expected The expected value
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* @param string $input The input to compare against
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* @return bool True if the two strings are equal, otherwise false.
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*/
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public static function equals($expected, $input) {
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if(!is_string($expected) || !is_string($input)) {
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return false;
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}
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if(function_exists('hash_equals')) {
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return hash_equals($expected, $input);
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}
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$randomString = \OC::$server->getSecureRandom()->getLowStrengthGenerator()->generate(10);
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if(hash('sha512', $expected.$randomString) === hash('sha512', $input.$randomString)) {
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if($expected === $input) {
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return true;
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}
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}
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return false;
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}
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} |