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<?php |
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namespace Riimu\Kit\SecureRandom\Generator; |
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/** |
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* Generates bytes reading directly from the random device. |
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* |
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* RandomReader generates random bytes by reading directly from the random |
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* device (i.e. from /dev/urandom or /dev/random). |
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* |
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* @author Riikka Kalliomäki <[email protected]> |
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* @copyright Copyright (c) 2014-2017 Riikka Kalliomäki |
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* @license http://opensource.org/licenses/mit-license.php MIT License |
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*/ |
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class RandomReader extends AbstractGenerator |
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{ |
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/** @var string Path to the random device */ |
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private $source; |
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/** @var resource|null File pointer to the random source */ |
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private $pointer; |
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/** |
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* Creates new instance of RandomReader. |
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* @param bool $urandom True to read from /dev/urandom and false to read from /dev/random |
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*/ |
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public function __construct($urandom = true) |
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{ |
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$this->source = $urandom ? '/dev/urandom' : '/dev/random'; |
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$this->pointer = null; |
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} |
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/** |
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* Closes the file pointer. |
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*/ |
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public function __destruct() |
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{ |
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if (isset($this->pointer)) { |
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fclose($this->pointer); |
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} |
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$this->pointer = null; |
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} |
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public function isSupported() |
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{ |
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return is_readable($this->source); |
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} |
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protected function readBytes($count) |
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{ |
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return fread($this->getPointer(), $count); |
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} |
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/** |
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* Returns the pointer to the random source. |
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* @return resource The pointer to the random source |
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*/ |
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private function getPointer() |
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{ |
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if (!isset($this->pointer)) { |
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$this->pointer = fopen($this->source, 'r'); |
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// File read buffering is not supported on HHVM |
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if (!defined('HHVM_VERSION')) { |
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stream_set_chunk_size($this->pointer, 32); |
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stream_set_read_buffer($this->pointer, 32); |
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} |
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} |
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return $this->pointer; |
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} |
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} |
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Riimu /
Kit-SecureRandom
