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Viewing: RandomNodeProvider.php

<?php

/**
 * This file is part of the ramsey/uuid library
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
 * @license http://opensource.org/licenses/MIT MIT
 */

declare(strict_types=1);

namespace Ramsey\Uuid\Provider\Node;

use Ramsey\Uuid\Exception\RandomSourceException;
use Ramsey\Uuid\Provider\NodeProviderInterface;
use Ramsey\Uuid\Type\Hexadecimal;
use Throwable;

use function bin2hex;
use function dechex;
use function hex2bin;
use function hexdec;
use function str_pad;
use function substr;

use const STR_PAD_LEFT;

/**
 * RandomNodeProvider generates a random node ID
 *
 * @link https://www.rfc-editor.org/rfc/rfc9562#section-6.10 RFC 9562, 6.10. UUIDs That Do Not Identify the Host
 */
class RandomNodeProvider implements NodeProviderInterface
{
    public function getNode(): Hexadecimal
    {
        try {
            $nodeBytes = random_bytes(6);
        } catch (Throwable $exception) {
            throw new RandomSourceException($exception->getMessage(), (int) $exception->getCode(), $exception);
        }

        // Split the node bytes for math on 32-bit systems.
        $nodeMsb = substr($nodeBytes, 0, 3);
        $nodeLsb = substr($nodeBytes, 3);

        // Set the multicast bit; see RFC 9562, section 6.10.
        $nodeMsb = hex2bin(str_pad(dechex(hexdec(bin2hex($nodeMsb)) | 0x010000), 6, '0', STR_PAD_LEFT));

        return new Hexadecimal(str_pad(bin2hex($nodeMsb . $nodeLsb), 12, '0', STR_PAD_LEFT));
    }
}

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Viewing: RandomNodeProvider.php

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