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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
* @link https://benramsey.com/projects/ramsey-uuid/ Documentation
* @link https://packagist.org/packages/ramsey/uuid Packagist
* @link https://github.com/ramsey/uuid GitHub
*/
namespace Ramsey\Uuid\Provider\Node;
use Exception;
use Ramsey\Uuid\Provider\NodeProviderInterface;
/**
* RandomNodeProvider provides functionality to generate a random node ID, in
* the event that the node ID could not be obtained from the host system
*
* @link http://tools.ietf.org/html/rfc4122#section-4.5
*/
class RandomNodeProvider implements NodeProviderInterface
{
/**
* Returns the system node ID
*
* @return string System node ID as a hexadecimal string
* @throws Exception if it was not possible to gather sufficient entropy
*/
public function getNode()
{
$nodeBytes = random_bytes(6);
// 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 . $nodeLsb;
return str_pad(bin2hex($node), 12, '0', STR_PAD_LEFT);
}
}
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