46 lines
1.2 KiB
PHP
46 lines
1.2 KiB
PHP
<?php
|
|
/**
|
|
* Copyright (c) 2014 Lukas Reschke <lukas@owncloud.com>
|
|
* This file is licensed under the Affero General Public License version 3 or
|
|
* later.
|
|
* See the COPYING-README file.
|
|
*/
|
|
|
|
namespace OC\Security;
|
|
|
|
class StringUtils {
|
|
|
|
/**
|
|
* Compares whether two strings are equal. To prevent guessing of the string
|
|
* length this is done by comparing two hashes against each other and afterwards
|
|
* a comparison of the real string to prevent against the unlikely chance of
|
|
* collisions.
|
|
*
|
|
* Be aware that this function may leak whether the string to compare have a different
|
|
* length.
|
|
*
|
|
* @param string $expected The expected value
|
|
* @param string $input The input to compare against
|
|
* @return bool True if the two strings are equal, otherwise false.
|
|
*/
|
|
public static function equals($expected, $input) {
|
|
|
|
if(!is_string($expected) || !is_string($input)) {
|
|
return false;
|
|
}
|
|
|
|
if(function_exists('hash_equals')) {
|
|
return hash_equals($expected, $input);
|
|
}
|
|
|
|
$randomString = \OC::$server->getSecureRandom()->getLowStrengthGenerator()->generate(10);
|
|
|
|
if(hash('sha512', $expected.$randomString) === hash('sha512', $input.$randomString)) {
|
|
if($expected === $input) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
} |