| 1 |
<?php |
| 2 |
/** |
| 3 |
* Random_* Compatibility Library |
| 4 |
* for using the new PHP 7 random_* API in PHP 5 projects |
| 5 |
* |
| 6 |
* The MIT License (MIT) |
| 7 |
* |
| 8 |
* Copyright (c) 2015 - 2018 Paragon Initiative Enterprises |
| 9 |
* |
| 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 |
if (!is_callable('random_bytes')) { |
| 30 |
/** |
| 31 |
* Powered by ext/mcrypt (and thankfully NOT libmcrypt) |
| 32 |
* |
| 33 |
* @ref https://bugs.php.net/bug.php?id=55169 |
| 34 |
* @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386 |
| 35 |
* |
| 36 |
* @param int $bytes |
| 37 |
* |
| 38 |
* @throws Exception |
| 39 |
* |
| 40 |
* @return string |
| 41 |
*/ |
| 42 |
function random_bytes($bytes) |
| 43 |
{ |
| 44 |
try { |
| 45 |
/** @var int $bytes */ |
| 46 |
$bytes = RandomCompat_intval($bytes); |
| 47 |
} catch (TypeError $ex) { |
| 48 |
throw new TypeError( |
| 49 |
'random_bytes(): $bytes must be an integer' |
| 50 |
); |
| 51 |
} |
| 52 |
|
| 53 |
if ($bytes < 1) { |
| 54 |
throw new Error( |
| 55 |
'Length must be greater than 0' |
| 56 |
); |
| 57 |
} |
| 58 |
|
| 59 |
/** @var string|bool $buf */ |
| 60 |
$buf = @mcrypt_create_iv((int) $bytes, (int) MCRYPT_DEV_URANDOM); |
| 61 |
if ( |
| 62 |
is_string($buf) |
| 63 |
&& |
| 64 |
RandomCompat_strlen($buf) === $bytes |
| 65 |
) { |
| 66 |
/** |
| 67 |
* Return our random entropy buffer here: |
| 68 |
*/ |
| 69 |
return $buf; |
| 70 |
} |
| 71 |
|
| 72 |
/** |
| 73 |
* If we reach here, PHP has failed us. |
| 74 |
*/ |
| 75 |
throw new Exception( |
| 76 |
'Could not gather sufficient random data' |
| 77 |
); |
| 78 |
} |
| 79 |
} |
| 80 |
|
