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-rw-r--r--plugins/OStatus/extlib/Crypt/Random.php193
1 files changed, 124 insertions, 69 deletions
diff --git a/plugins/OStatus/extlib/Crypt/Random.php b/plugins/OStatus/extlib/Crypt/Random.php
index fbb41074e..bfc24ca62 100644
--- a/plugins/OStatus/extlib/Crypt/Random.php
+++ b/plugins/OStatus/extlib/Crypt/Random.php
@@ -1,70 +1,125 @@
-<?php
-/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
-
-/**
- * Random Number Generator
- *
- * PHP versions 4 and 5
- *
- * Here's a short example of how to use this library:
- * <code>
- * <?php
- * include('Crypt/Random.php');
- *
- * echo crypt_random();
- * ?>
- * </code>
- *
- * LICENSE: This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
- *
- * @category Crypt
- * @package Crypt_Random
- * @author Jim Wigginton <terrafrost@php.net>
- * @copyright MMVII Jim Wigginton
- * @license http://www.gnu.org/licenses/lgpl.txt
- * @version $Id: Random.php,v 1.4 2008/05/21 05:15:32 terrafrost Exp $
- * @link http://phpseclib.sourceforge.net
- */
-
-/**
- * Generate a random value. Feel free to replace this function with a cryptographically secure PRNG.
- *
- * @param optional Integer $min
- * @param optional Integer $max
- * @param optional String $randomness_path
- * @return Integer
- * @access public
- */
-function crypt_random($min = 0, $max = 0x7FFFFFFF, $randomness_path = '/dev/urandom')
-{
- static $seeded = false;
-
- if (!$seeded) {
- $seeded = true;
- if (file_exists($randomness_path)) {
- $fp = fopen($randomness_path, 'r');
- $temp = unpack('Nint', fread($fp, 4));
- mt_srand($temp['int']);
- fclose($fp);
- } else {
- list($sec, $usec) = explode(' ', microtime());
- mt_srand((float) $sec + ((float) $usec * 100000));
- }
- }
-
- return mt_rand($min, $max);
-}
+<?php
+/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
+
+/**
+ * Random Number Generator
+ *
+ * PHP versions 4 and 5
+ *
+ * Here's a short example of how to use this library:
+ * <code>
+ * <?php
+ * include('Crypt/Random.php');
+ *
+ * echo crypt_random();
+ * ?>
+ * </code>
+ *
+ * LICENSE: This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * @category Crypt
+ * @package Crypt_Random
+ * @author Jim Wigginton <terrafrost@php.net>
+ * @copyright MMVII Jim Wigginton
+ * @license http://www.gnu.org/licenses/lgpl.txt
+ * @version $Id: Random.php,v 1.6 2010/02/28 05:28:38 terrafrost Exp $
+ * @link http://phpseclib.sourceforge.net
+ */
+
+/**
+ * Generate a random value.
+ *
+ * On 32-bit machines, the largest distance that can exist between $min and $max is 2**31.
+ * If $min and $max are farther apart than that then the last ($max - range) numbers.
+ *
+ * Depending on how this is being used, it may be worth while to write a replacement. For example,
+ * a PHP-based web app that stores its data in an SQL database can collect more entropy than this function
+ * can.
+ *
+ * @param optional Integer $min
+ * @param optional Integer $max
+ * @return Integer
+ * @access public
+ */
+function crypt_random($min = 0, $max = 0x7FFFFFFF)
+{
+ if ($min == $max) {
+ return $min;
+ }
+
+ // see http://en.wikipedia.org/wiki//dev/random
+ if (file_exists('/dev/urandom')) {
+ $fp = fopen('/dev/urandom', 'rb');
+ extract(unpack('Nrandom', fread($fp, 4)));
+ fclose($fp);
+
+ // say $min = 0 and $max = 3. if we didn't do abs() then we could have stuff like this:
+ // -4 % 3 + 0 = -1, even though -1 < $min
+ return abs($random) % ($max - $min) + $min;
+ }
+
+ /* Prior to PHP 4.2.0, mt_srand() had to be called before mt_rand() could be called.
+ Prior to PHP 5.2.6, mt_rand()'s automatic seeding was subpar, as elaborated here:
+
+ http://www.suspekt.org/2008/08/17/mt_srand-and-not-so-random-numbers/
+
+ The seeding routine is pretty much ripped from PHP's own internal GENERATE_SEED() macro:
+
+ http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3_2/ext/standard/php_rand.h?view=markup */
+ if (version_compare(PHP_VERSION, '5.2.5', '<=')) {
+ static $seeded;
+ if (!isset($seeded)) {
+ $seeded = true;
+ mt_srand(fmod(time() * getmypid(), 0x7FFFFFFF) ^ fmod(1000000 * lcg_value(), 0x7FFFFFFF));
+ }
+ }
+
+ static $crypto;
+
+ // The CSPRNG's Yarrow and Fortuna periodically reseed. This function can be reseeded by hitting F5
+ // in the browser and reloading the page.
+
+ if (!isset($crypto)) {
+ $key = $iv = '';
+ for ($i = 0; $i < 8; $i++) {
+ $key.= pack('n', mt_rand(0, 0xFFFF));
+ $iv .= pack('n', mt_rand(0, 0xFFFF));
+ }
+ switch (true) {
+ case class_exists('Crypt_AES'):
+ $crypto = new Crypt_AES(CRYPT_AES_MODE_CTR);
+ break;
+ case class_exists('Crypt_TripleDES'):
+ $crypto = new Crypt_TripleDES(CRYPT_DES_MODE_CTR);
+ break;
+ case class_exists('Crypt_DES'):
+ $crypto = new Crypt_DES(CRYPT_DES_MODE_CTR);
+ break;
+ case class_exists('Crypt_RC4'):
+ $crypto = new Crypt_RC4();
+ break;
+ default:
+ extract(unpack('Nrandom', pack('H*', sha1(mt_rand(0, 0x7FFFFFFF)))));
+ return abs($random) % ($max - $min) + $min;
+ }
+ $crypto->setKey($key);
+ $crypto->setIV($iv);
+ }
+
+ extract(unpack('Nrandom', $crypto->encrypt("\0\0\0\0")));
+ return abs($random) % ($max - $min) + $min;
+}
?> \ No newline at end of file
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