71 lines
2.2 KiB
PHP
71 lines
2.2 KiB
PHP
|
<?php
|
||
|
|
/**
|
||
|
|
* Random_* Compatibility Library
|
||
|
|
* for using the new PHP 7 random_* API in PHP 5 projects
|
||
|
|
*
|
||
|
|
* The MIT License (MIT)
|
||
|
|
*
|
||
|
|
* Copyright (c) 2015 Paragon Initiative Enterprises
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
|
* in the Software without restriction, including without limitation the rights
|
||
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
|
* furnished to do so, subject to the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included in
|
||
|
|
* all copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||
|
|
* SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Powered by ext/mcrypt (and thankfully NOT libmcrypt)
|
||
|
|
*
|
||
|
|
* @ref https://bugs.php.net/bug.php?id=55169
|
||
|
|
* @ref https://github.com/php/php-src/blob/c568ffe5171d942161fc8dda066bce844bdef676/ext/mcrypt/mcrypt.c#L1321-L1386
|
||
|
|
*
|
||
|
|
* @param int $bytes
|
||
|
|
*
|
||
|
|
* @throws Exception
|
||
|
|
*
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
function random_bytes($bytes)
|
||
|
|
{
|
||
|
|
if (!is_int($bytes)) {
|
||
|
|
throw new TypeError(
|
||
|
|
'Length must be an integer'
|
||
|
|
);
|
||
|
|
}
|
||
|
|
if ($bytes < 1) {
|
||
|
|
throw new Error(
|
||
|
|
'Length must be greater than 0'
|
||
|
|
);
|
||
|
|
}
|
||
|
|
|
||
|
|
$buf = mcrypt_create_iv($bytes, MCRYPT_DEV_URANDOM);
|
||
|
|
if ($buf !== false) {
|
||
|
|
if (RandomCompat_strlen($buf) === $bytes) {
|
||
|
|
/**
|
||
|
|
* Return our random entropy buffer here:
|
||
|
|
*/
|
||
|
|
return $buf;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* If we reach here, PHP has failed us.
|
||
|
|
*/
|
||
|
|
throw new Exception(
|
||
|
|
'PHP failed to generate random data.'
|
||
|
|
);
|
||
|
|
}
|