| 1 | <?php |
| 2 | /** |
| 3 | * The Rand Random Number Source |
| 4 | * |
| 5 | * This source generates low strength random numbers by using the internal |
| 6 | * rand() function. By itself it is quite weak. However when combined with |
| 7 | * other sources it does provide significant benefit. |
| 8 | * |
| 9 | * PHP version 5.3 |
| 10 | * |
| 11 | * @category PHPCryptLib |
| 12 | * @package Random |
| 13 | * @subpackage Source |
| 14 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> |
| 15 | * @copyright 2011 The Authors |
| 16 | * @license http://www.opensource.org/licenses/mit-license.html MIT License |
| 17 | * @version Build @@version@@ |
| 18 | */ |
| 19 | |
| 20 | namespace CryptLib\Random\Source; |
| 21 | |
| 22 | use CryptLib\Core\Strength; |
| 23 | |
| 24 | /** |
| 25 | * The Rand Random Number Source |
| 26 | * |
| 27 | * This source generates low strength random numbers by using the internal |
| 28 | * rand() function. By itself it is quite weak. However when combined with |
| 29 | * other sources it does provide significant benefit. |
| 30 | * |
| 31 | * @category PHPCryptLib |
| 32 | * @package Random |
| 33 | * @subpackage Source |
| 34 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> |
| 35 | * @codeCoverageIgnore |
| 36 | */ |
| 37 | class Rand implements \CryptLib\Random\Source { |
| 38 | |
| 39 | /** |
| 40 | * Return an instance of Strength indicating the strength of the source |
| 41 | * |
| 42 | * @return Strength An instance of one of the strength classes |
| 43 | */ |
| 44 | public static function getStrength() { |
| 45 | // Detect if Suhosin Hardened PHP patch is applied |
| 46 | if (defined('S_ALL')) { |
| 47 | return new Strength(Strength::LOW); |
| 48 | } else { |
| 49 | return new Strength(Strength::VERYLOW); |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Generate a random string of the specified size |
| 55 | * |
| 56 | * @param int $size The size of the requested random string |
| 57 | * |
| 58 | * @return string A string of the requested size |
| 59 | */ |
| 60 | public function generate($size) { |
| 61 | $result = ''; |
| 62 | for ($i = 0; $i < $size; $i++) { |
| 63 | $result .= chr((rand() ^ rand()) % 256); |
| 64 | } |
| 65 | return $result; |
| 66 | } |
| 67 | |
| 68 | } |