vendor/symfony/polyfill-php56/Php56.php

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Polyfill\Php56;

use Symfony\Polyfill\Util\Binary;

/**
 * @internal
 */
final class Php56
{
    const LDAP_ESCAPE_FILTER = 1;
    const LDAP_ESCAPE_DN = 2;

    public static function hash_equals($knownString, $userInput)
    {
        if (!is_string($knownString)) {
            trigger_error('Expected known_string to be a string, '.gettype($knownString).' given', E_USER_WARNING);

            return false;
        }

        if (!is_string($userInput)) {
            trigger_error('Expected user_input to be a string, '.gettype($userInput).' given', E_USER_WARNING);

            return false;
        }

        $knownLen = Binary::strlen($knownString);
        $userLen = Binary::strlen($userInput);

        if ($knownLen !== $userLen) {
            return false;
        }

        $result = 0;

        for ($i = 0; $i < $knownLen; ++$i) {
            $result |= ord($knownString[$i]) ^ ord($userInput[$i]);
        }

        return 0 === $result;
    }

    /**
     * Stub implementation of the {@link ldap_escape()} function of the ldap
     * extension.
     *
     * Escape strings for safe use in LDAP filters and DNs.
     *
     * @author Chris Wright <ldapi@daverandom.com>