From 9fc247408cdd171d37ebfc0de018fb740509557b Mon Sep 17 00:00:00 2001
From: Dion Hulse <dd32@git.wordpress.org>
Date: Fri, 8 Jan 2016 03:27:58 +0000
Subject: [PATCH] Update to Random_Compat 1.1.5 to fix an issue with older
 libSodium modules.

Props sarciszewski.
Fixes #35327 for trunk.


git-svn-id: https://develop.svn.wordpress.org/trunk@36220 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/random_compat/random.php      | 10 ++-
 .../random_bytes_libsodium_legacy.php         | 84 +++++++++++++++++++
 2 files changed, 91 insertions(+), 3 deletions(-)
 create mode 100644 src/wp-includes/random_compat/random_bytes_libsodium_legacy.php

diff --git a/src/wp-includes/random_compat/random.php b/src/wp-includes/random_compat/random.php
index 8898a35bcd..fb21ef2e01 100644
--- a/src/wp-includes/random_compat/random.php
+++ b/src/wp-includes/random_compat/random.php
@@ -58,7 +58,11 @@ if (PHP_VERSION_ID < 70000) {
          */
         if (extension_loaded('libsodium')) {
             // See random_bytes_libsodium.php
-            require_once $RandomCompatDIR.'/random_bytes_libsodium.php';
+            if (PHP_VERSION_ID >= 50300 && function_exists('\\Sodium\\randombytes_buf')) {
+                require_once $RandomCompatDIR.'/random_bytes_libsodium.php';
+            } elseif (method_exists('Sodium', 'randombytes_buf')) {
+                require_once $RandomCompatDIR.'/random_bytes_libsodium_legacy.php';
+            }
         }
         if (
             !function_exists('random_bytes') && 
@@ -75,8 +79,8 @@ if (PHP_VERSION_ID < 70000) {
             // that is not helpful to us here.
             
             // See random_bytes_dev_urandom.php
-            require_once $RandomCompatDIR.'/random_bytes_dev_urandom.php';
-        }
+                require_once $RandomCompatDIR.'/random_bytes_dev_urandom.php';
+            }
         if (
             !function_exists('random_bytes') &&
             PHP_VERSION_ID >= 50307 &&
diff --git a/src/wp-includes/random_compat/random_bytes_libsodium_legacy.php b/src/wp-includes/random_compat/random_bytes_libsodium_legacy.php
new file mode 100644
index 0000000000..4c76ff96d2
--- /dev/null
+++ b/src/wp-includes/random_compat/random_bytes_libsodium_legacy.php
@@ -0,0 +1,84 @@
+<?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.
+ */
+
+/**
+ * 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'
+        );
+    }
+    /**
+     * \Sodium\randombytes_buf() doesn't allow more than 2147483647 bytes to be
+     * generated in one invocation.
+     */
+    if ($bytes > 2147483647) {
+        $buf = '';
+        for ($i = 0; $i < $bytes; $i += 1073741824) {
+            $n = ($bytes - $i) > 1073741824
+                ? 1073741824
+                : $bytes - $i;
+            $buf .= Sodium::randombytes_buf($n);
+        }
+    } else {
+        $buf = Sodium::randombytes_buf($bytes);
+    }
+
+    if ($buf !== false) {
+        if (RandomCompat_strlen($buf) === $bytes) {
+            return $buf;
+        }
+    }
+
+    /**
+     * If we reach here, PHP has failed us.
+     */
+    throw new Exception(
+        'Could not gather sufficient random data'
+    );
+}