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+<?php
+/**
+ * Random_* Compatibility Library
+ * for using the new PHP 7 random_* API in PHP 5 projects
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2015 - 2018 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')) {
+ /**
+ * 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)
+ {
+ try {
+ /** @var int $bytes */
+ $bytes = RandomCompat_intval($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|bool $buf */
+ $buf = @mcrypt_create_iv((int) $bytes, (int) MCRYPT_DEV_URANDOM);
+ if (
+ is_string($buf)
+ &&
+ RandomCompat_strlen($buf) === $bytes
+ ) {
+ /**
+ * Return our random entropy buffer here:
+ */
+ return $buf;
+ }
+
+ /**
+ * If we reach here, PHP has failed us.
+ */
+ throw new Exception(
+ 'Could not gather sufficient random data'
+ );
+ }
+}