93 lines
2.8 KiB
PHP
93 lines
2.8 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 - 2017 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.
|
|
*/
|
|
|
|
if (!is_callable('random_bytes')) {
|
|
/**
|
|
* If the libsodium PHP extension is loaded, we'll use it above any other
|
|
* solution.
|
|
*
|
|
* libsodium-php project:
|
|
* @ref https://github.com/jedisct1/libsodium-php
|
|
*
|
|
* @param int $bytes
|
|
*
|
|
* @throws Exception
|
|
*
|
|
* @return string
|
|
*/
|
|
function random_bytes($bytes)
|
|
{
|
|
try {
|
|
$bytes = RandomCompat_intval($bytes);
|
|
} catch (TypeError $ex) {
|
|
throw new TypeError(
|
|
'random_bytes(): $bytes must be an integer'
|
|
);
|
|
}
|
|
|
|
if ($bytes < 1) {
|
|
throw new Error(
|
|
'Length must be greater than 0'
|
|
);
|
|
}
|
|
|
|
/**
|
|
* @var string
|
|
*/
|
|
$buf = '';
|
|
|
|
/**
|
|
* \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
|
|
* generated in one invocation.
|
|
*/
|
|
if ($bytes > 2147483647) {
|
|
for ($i = 0; $i < $bytes; $i += 1073741824) {
|
|
$n = ($bytes - $i) > 1073741824
|
|
? 1073741824
|
|
: $bytes - $i;
|
|
$buf .= Sodium::randombytes_buf((int) $n);
|
|
}
|
|
} else {
|
|
$buf .= Sodium::randombytes_buf((int) $bytes);
|
|
}
|
|
|
|
if (is_string($buf)) {
|
|
if (RandomCompat_strlen($buf) === $bytes) {
|
|
return $buf;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* If we reach here, PHP has failed us.
|
|
*/
|
|
throw new Exception(
|
|
'Could not gather sufficient random data'
|
|
);
|
|
}
|
|
}
|