From cd46dc479cf975cbb843c360f1240203aebfcb32 Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Sun, 1 Apr 2012 12:39:48 -0700
Subject: [PATCH] Beef up the random number generator by using Joomla's new
 implementation.

---
 modules/gallery/helpers/random.php      |   6 +-
 modules/gallery/vendor/joomla/crypt.php | 151 ++++++++++++++++++++++++
 modules/rest/helpers/rest_event.php     |   6 +-
 3 files changed, 158 insertions(+), 5 deletions(-)
 create mode 100644 modules/gallery/vendor/joomla/crypt.php

diff --git a/modules/gallery/helpers/random.php b/modules/gallery/helpers/random.php
index 0ee83f497b..ea08815a87 100644
--- a/modules/gallery/helpers/random.php
+++ b/modules/gallery/helpers/random.php
@@ -17,13 +17,15 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
  */
+
 class random_Core {
   /**
    * Return a random 32 byte hash value.
    * @param string extra entropy data
    */
-  static function hash($entropy="") {
-    return md5($entropy . uniqid(mt_rand(), true));
+  static function hash($length=32) {
+    require_once(MODPATH . "gallery/vendor/joomla/crypt.php");
+    return md5(JCrypt::genRandomBytes($length));
   }
 
   /**
diff --git a/modules/gallery/vendor/joomla/crypt.php b/modules/gallery/vendor/joomla/crypt.php
new file mode 100644
index 0000000000..c7d477dd03
--- /dev/null
+++ b/modules/gallery/vendor/joomla/crypt.php
@@ -0,0 +1,151 @@
+<?php defined("SYSPATH") or die("No direct script access.");
+/**
+ * @package     Joomla.Platform
+ * @subpackage  Crypt
+ *
+ * @copyright   Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE
+ */
+
+// defined('JPATH_PLATFORM') or die;
+
+/**
+ * JCrypt is a Joomla Platform class for handling basic encryption/decryption of data.
+ *
+ * @package     Joomla.Platform
+ * @subpackage  Crypt
+ * @since       12.1
+ */
+class JCrypt
+{
+	/**
+	 * Generate random bytes.
+	 *
+	 * @param   integer  $length  Length of the random data to generate
+	 *
+	 * @return  string  Random binary data
+	 *
+	 * @since  12.1
+	 */
+	public static function genRandomBytes($length = 16)
+	{
+		$sslStr = '';
+		/*
+		 * if a secure randomness generator exists and we don't
+		 * have a buggy PHP version use it.
+		 */
+		if (
+			function_exists('openssl_random_pseudo_bytes')
+			&& (version_compare(PHP_VERSION, '5.3.4') >= 0
+				|| substr(PHP_OS, 0, 3) !== 'WIN'
+			)
+		)
+		{
+			$sslStr = openssl_random_pseudo_bytes($length, $strong);
+			if ($strong)
+			{
+				return $sslStr;
+			}
+		}
+
+		/*
+		 * Collect any entropy available in the system along with a number
+		 * of time measurements of operating system randomness.
+		 */
+		$bitsPerRound = 2;
+		$maxTimeMicro = 400;
+		$shaHashLength = 20;
+		$randomStr = '';
+		$total = $length;
+
+		// Check if we can use /dev/urandom.
+		$urandom = false;
+		$handle = null;
+		if (function_exists('stream_set_read_buffer') && @is_readable('/dev/urandom'))
+		{
+			$handle = @fopen('/dev/urandom', 'rb');
+			if ($handle)
+			{
+				$urandom = true;
+			}
+		}
+
+		while ($length > strlen($randomStr))
+		{
+			$bytes = ($total > $shaHashLength)? $shaHashLength : $total;
+			$total -= $bytes;
+			/*
+			 * Collect any entropy available from the PHP system and filesystem.
+			 * If we have ssl data that isn't strong, we use it once.
+			 */
+			$entropy = rand() . uniqid(mt_rand(), true) . $sslStr;
+			$entropy .= implode('', @fstat(fopen( __FILE__, 'r')));
+			$entropy .= memory_get_usage();
+			$sslStr = '';
+			if ($urandom)
+			{
+				stream_set_read_buffer($handle, 0);
+				$entropy .= @fread($handle, $bytes);
+			}
+			else
+			{
+				/*
+				 * There is no external source of entropy so we repeat calls
+				 * to mt_rand until we are assured there's real randomness in
+				 * the result.
+				 *
+				 * Measure the time that the operations will take on average.
+				 */
+				$samples = 3;
+				$duration = 0;
+				for ($pass = 0; $pass < $samples; ++$pass)
+				{
+					$microStart = microtime(true) * 1000000;
+					$hash = sha1(mt_rand(), true);
+					for ($count = 0; $count < 50; ++$count)
+					{
+						$hash = sha1($hash, true);
+					}
+					$microEnd = microtime(true) * 1000000;
+					$entropy .= $microStart . $microEnd;
+					if ($microStart > $microEnd) {
+						$microEnd += 1000000;
+					}
+					$duration += $microEnd - $microStart;
+				}
+				$duration = $duration / $samples;
+
+				/*
+				 * Based on the average time, determine the total rounds so that
+				 * the total running time is bounded to a reasonable number.
+				 */
+				$rounds = (int)(($maxTimeMicro / $duration) * 50);
+
+				/*
+				 * Take additional measurements. On average we can expect
+				 * at least $bitsPerRound bits of entropy from each measurement.
+				 */
+				$iter = $bytes * (int) ceil(8 / $bitsPerRound);
+				for ($pass = 0; $pass < $iter; ++$pass)
+				{
+					$microStart = microtime(true);
+					$hash = sha1(mt_rand(), true);
+					for ($count = 0; $count < $rounds; ++$count)
+					{
+						$hash = sha1($hash, true);
+					}
+					$entropy .= $microStart . microtime(true);
+				}
+			}
+
+			$randomStr .= sha1($entropy, true);
+		}
+
+		if ($urandom)
+		{
+			@fclose($handle);
+		}
+
+		return substr($randomStr, 0, $length);
+	}
+}
diff --git a/modules/rest/helpers/rest_event.php b/modules/rest/helpers/rest_event.php
index 0204eb55bb..ec50088456 100644
--- a/modules/rest/helpers/rest_event.php
+++ b/modules/rest/helpers/rest_event.php
@@ -43,7 +43,7 @@ static function change_provider($new_provider) {
   static function user_add_form_admin_completed($user, $form) {
     $key = ORM::factory("user_access_key");
     $key->user_id = $user->id;
-    $key->access_key = random::hash($user->name);
+    $key->access_key = random::hash();
     $key->save();
   }
 
@@ -64,7 +64,7 @@ static function _get_access_key_form($user, $form) {
 
     if (!$key->loaded()) {
       $key->user_id = $user->id;
-      $key->access_key = random::hash($user->name);
+      $key->access_key = random::hash();
       $key->save();
     }
 
@@ -93,7 +93,7 @@ static function show_user_profile($data) {
 
     if (!$key->loaded()) {
       $key->user_id = $data->user->id;
-      $key->access_key = random::hash($data->user->name);
+      $key->access_key = random::hash();
       $key->save();
     }
     $view->rest_key = $key->access_key;