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- 06.01.2017
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random_bytes_openssl.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 * Since openssl_random_pseudo_bytes() uses openssl's
31 * RAND_pseudo_bytes() API, which has been marked as deprecated by the
32 * OpenSSL team, this is our last resort before failure.
33 *
34 * @ref https://www.openssl.org/docs/crypto/RAND_bytes.html
35 *
36 * @param int $bytes
37 *
38 * @throws Exception
39 *
40 * @return string
41 */
42 function random_bytes($bytes)
43 {
44 try {
45 $bytes = RandomCompat_intval($bytes);
46 } catch (TypeError $ex) {
47 throw new TypeError(
48 'random_bytes(): $bytes must be an integer'
49 );
50 }
51
52 if ($bytes < 1) {
53 throw new Error(
54 'Length must be greater than 0'
55 );
56 }
57
58 /**
59 * $secure is passed by reference. If it's set to false, fail. Note
60 * that this will only return false if this function fails to return
61 * any data.
62 *
63 * @ref https://github.com/paragonie/random_compat/issues/6#issuecomment-119564973
64 */
65 $secure = true;
66 $buf = openssl_random_pseudo_bytes($bytes, $secure);
67 if (
68 $buf !== false
69 &&
70 $secure
71 &&
72 RandomCompat_strlen($buf) === $bytes
73 ) {
74 return $buf;
75 }
76
77 /**
78 * If we reach here, PHP has failed us.
79 */
80 throw new Exception(
81 'Could not gather sufficient random data'
82 );
83 }
84