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Code Editor : SecureRandom.php
<?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\Component\Security\Core\Util; use Psr\Log\LoggerInterface; /** * A secure random number generator implementation. * * @author Fabien Potencier <fabien@symfony.com> * @author Johannes M. Schmitt <schmittjoh@gmail.com> */ final class SecureRandom implements SecureRandomInterface { private $logger; private $useOpenSsl; private $seed; private $seedUpdated; private $seedLastUpdatedAt; private $seedFile; /** * Constructor. * * Be aware that a guessable seed will severely compromise the PRNG * algorithm that is employed. * * @param string $seedFile * @param LoggerInterface $logger */ public function __construct($seedFile = null, LoggerInterface $logger = null) { $this->seedFile = $seedFile; $this->logger = $logger; // determine whether to use OpenSSL if (defined('PHP_WINDOWS_VERSION_BUILD') && version_compare(PHP_VERSION, '5.3.4', '<')) { $this->useOpenSsl = false; } elseif (!function_exists('openssl_random_pseudo_bytes')) { if (null !== $this->logger) { $this->logger->notice('It is recommended that you enable the "openssl" extension for random number generation.'); } $this->useOpenSsl = false; } else { $this->useOpenSsl = true; } } /** * {@inheritdoc} */ public function nextBytes($nbBytes) { // try OpenSSL if ($this->useOpenSsl) { $bytes = openssl_random_pseudo_bytes($nbBytes, $strong); if (false !== $bytes && true === $strong) { return $bytes; } if (null !== $this->logger) { $this->logger->info('OpenSSL did not produce a secure random number.'); } } // initialize seed if (null === $this->seed) { if (null === $this->seedFile) { throw new \RuntimeException('You need to specify a file path to store the seed.'); } if (is_file($this->seedFile)) { list($this->seed, $this->seedLastUpdatedAt) = $this->readSeed(); } else { $this->seed = uniqid(mt_rand(), true); $this->updateSeed(); } } $bytes = ''; while (strlen($bytes) < $nbBytes) { static $incr = 1; $bytes .= hash('sha512', $incr++.$this->seed.uniqid(mt_rand(), true).$nbBytes, true); $this->seed = base64_encode(hash('sha512', $this->seed.$bytes.$nbBytes, true)); $this->updateSeed(); } return substr($bytes, 0, $nbBytes); } private function readSeed() { return json_decode(file_get_contents($this->seedFile)); } private function updateSeed() { if (!$this->seedUpdated && $this->seedLastUpdatedAt < time() - mt_rand(1, 10)) { file_put_contents($this->seedFile, json_encode(array($this->seed, microtime(true)))); } $this->seedUpdated = true; } }
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