upgraded PHP libraries

vendor/paragonie/random_compat/lib/random_bytes_libsodium.php

@@ -1,22 +1,22 @@
 <?php
 /**
- * Random_* Compatibility Library 
+ * 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
@@ -43,6 +43,7 @@ if (!is_callable('random_bytes')) {
     function random_bytes($bytes)
     {
         try {
+            /** @var int $bytes */
             $bytes = RandomCompat_intval($bytes);
         } catch (TypeError $ex) {
             throw new TypeError(
@@ -60,6 +61,7 @@ if (!is_callable('random_bytes')) {
          * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
          * generated in one invocation.
          */
+        /** @var string|bool $buf */
         if ($bytes > 2147483647) {
             $buf = '';
             for ($i = 0; $i < $bytes; $i += 1073741824) {
@@ -69,10 +71,11 @@ if (!is_callable('random_bytes')) {
                 $buf .= \Sodium\randombytes_buf($n);
             }
         } else {
+            /** @var string|bool $buf */
             $buf = \Sodium\randombytes_buf($bytes);
         }
 
-        if ($buf !== false) {
+        if (is_string($buf)) {
             if (RandomCompat_strlen($buf) === $bytes) {
                 return $buf;
             }