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<?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 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 http://tools.ietf.org/html/rfc4122#section-4.5 RFC 4122, § 4.5: Node IDs 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 4122, section 4.5.
$nodeMsb = hex2bin(
str_pad(
dechex(hexdec(bin2hex($nodeMsb)) | 0x010000),
6,
'0',
STR_PAD_LEFT
)
);
// Recombine the node bytes.
$node = $nodeMsb . $nodeLsb;
return new Hexadecimal(str_pad(bin2hex($node), 12, '0', STR_PAD_LEFT));
}
}
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