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14d4f286 S |
1 | <?php |
2 | /** | |
3 | * The OpenSSL Random Number Source | |
4 | * | |
5 | * This uses the OS's secure generator to generate high strength numbers | |
6 | * | |
7 | * PHP version 5.3 | |
8 | * | |
9 | * @category PHPCryptLib | |
10 | * @package Random | |
11 | * @subpackage Source | |
12 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> | |
13 | * @copyright 2011 The Authors | |
14 | * @license http://www.opensource.org/licenses/mit-license.html MIT License | |
15 | * @version Build @@version@@ | |
16 | */ | |
17 | ||
18 | namespace CryptLib\Random\Source; | |
19 | ||
20 | use CryptLib\Core\Strength; | |
21 | ||
22 | /** | |
23 | * The OpenSSL Random Number Source | |
24 | * | |
25 | * This uses the OS's secure generator to generate high strength numbers | |
26 | * | |
27 | * @category PHPCryptLib | |
28 | * @package Random | |
29 | * @subpackage Source | |
30 | * @author Anthony Ferrara <ircmaxell@ircmaxell.com> | |
31 | * @codeCoverageIgnore | |
32 | */ | |
33 | class OpenSSL implements \CryptLib\Random\Source { | |
34 | ||
35 | /** | |
36 | * Return an instance of Strength indicating the strength of the source | |
37 | * | |
38 | * @return Strength An instance of one of the strength classes | |
39 | */ | |
40 | public static function getStrength() { | |
41 | return new Strength(Strength::HIGH); | |
42 | } | |
43 | ||
44 | /** | |
45 | * Generate a random string of the specified size | |
46 | * | |
47 | * @param int $size The size of the requested random string | |
48 | * | |
49 | * @return string A string of the requested size | |
50 | */ | |
51 | public function generate($size) { | |
52 | if (!function_exists('openssl_random_pseudo_bytes') || $size < 1) { | |
53 | return str_repeat(chr(0), $size); | |
54 | } | |
55 | /** | |
56 | * Note, normally we would check the return of of $crypto_strong to | |
57 | * ensure that we generated a good random string. However, since we're | |
58 | * using this as one part of many sources a low strength random number | |
59 | * shouldn't be much of an issue. | |
60 | */ | |
61 | return openssl_random_pseudo_bytes($size); | |
62 | } | |
63 | ||
64 | } |