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- Veröffentlicht
- 06.01.2017
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random_bytes_com_dotnet.php
01 <?php
02 /**
03 * Random_* Compatibility Library
04 * for using the new PHP 7 random_* API in PHP 5 projects
05 *
06 * The MIT License (MIT)
07 *
08 * Copyright (c) 2015 Paragon Initiative Enterprises
09 *
10 * Permission is hereby granted, free of charge, to any person obtaining a copy
11 * of this software and associated documentation files (the "Software"), to deal
12 * in the Software without restriction, including without limitation the rights
13 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 * copies of the Software, and to permit persons to whom the Software is
15 * furnished to do so, subject to the following conditions:
16 *
17 * The above copyright notice and this permission notice shall be included in
18 * all copies or substantial portions of the Software.
19 *
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
26 * SOFTWARE.
27 */
28
29 /**
30 * Windows with PHP < 5.3.0 will not have the function
31 * openssl_random_pseudo_bytes() available, so let's use
32 * CAPICOM to work around this deficiency.
33 *
34 * @param int $bytes
35 *
36 * @throws Exception
37 *
38 * @return string
39 */
40 function random_bytes($bytes)
41 {
42 try {
43 $bytes = RandomCompat_intval($bytes);
44 } catch (TypeError $ex) {
45 throw new TypeError(
46 'random_bytes(): $bytes must be an integer'
47 );
48 }
49
50 if ($bytes < 1) {
51 throw new Error(
52 'Length must be greater than 0'
53 );
54 }
55
56 $buf = '';
57 $util = new COM('CAPICOM.Utilities.1');
58 $execCount = 0;
59
60 /**
61 * Let's not let it loop forever. If we run N times and fail to
62 * get N bytes of random data, then CAPICOM has failed us.
63 */
64 do {
65 $buf .= base64_decode($util->GetRandom($bytes, 0));
66 if (RandomCompat_strlen($buf) >= $bytes) {
67 /**
68 * Return our random entropy buffer here:
69 */
70 return RandomCompat_substr($buf, 0, $bytes);
71 }
72 ++$execCount;
73 } while ($execCount < $bytes);
74
75 /**
76 * If we reach here, PHP has failed us.
77 */
78 throw new Exception(
79 'Could not gather sufficient random data'
80 );
81 }
82