/** * Windows with PHP < 5.3.0 will not have the function * openssl_random_pseudo_bytes() available, so let's use * CAPICOM to work around this deficiency. * * @param int $bytes * * @throws Exception * * @return string */ function random_bytes($bytes) { if (!is_int($bytes)) { throw new TypeError('Length must be an integer'); } if ($bytes < 1) { throw new Error('Length must be greater than 0'); } $buf = ''; $util = new COM('CAPICOM.Utilities.1'); $execCount = 0; /** * Let's not let it loop forever. If we run N times and fail to * get N bytes of random data, then CAPICOM has failed us. */ do { $buf .= base64_decode($util->GetRandom($bytes, 0)); if (RandomCompat_strlen($buf) >= $bytes) { /** * Return our random entropy buffer here: */ return RandomCompat_substr($buf, 0, $bytes); } ++$execCount; } while ($execCount < $bytes); /** * If we reach here, PHP has failed us. */ throw new Exception('PHP failed to generate random data.'); }
/** * Windows with PHP < 5.3.0 will not have the function * openssl_random_pseudo_bytes() available, so let's use * CAPICOM to work around this deficiency. * * @param int $bytes * @return string */ function random_bytes($bytes) { try { $buf = ''; $util = new COM('CAPICOM.Utilities.1'); $execs = 0; /** * Let's not let it loop forever. If we run N times and fail to * get N bytes of random data, then CAPICOM has failed us. */ do { $buf .= base64_decode($util->GetRandom($bytes, 0)); if (RandomCompat_strlen($buf) >= $bytes) { return RandomCompat_substr($buf, 0, $bytes); } ++$execs; } while ($execs < $bytes); } catch (Exception $e) { unset($e); // Let's not let CAPICOM errors kill our app } throw new Exception('PHP failed to generate random data.'); }