bug #96 move libraries to library - better alignment of like rotator

2025-04-25 22:30:10 +00:00 · 2011-06-28 21:11:52 -07:00 · 2011-06-28 21:11:52 -07:00 · 0b221e8945
commit 0b221e8945
parent 60caa03494
397 changed files with 30 additions and 30 deletions
--- a/library/phpsec/Crypt/Random.php
+++ b/library/phpsec/Crypt/Random.php
@ -0,0 +1,130 @@
+<?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 1.9 2010/04/24 06:40:48 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 open_basedir is enabled file_exists() will ouput an "open_basedir restriction in effect" warning,
+    // so we suppress it.
+    if (@file_exists('/dev/urandom')) {
+        static $fp;
+        if (!$fp) {
+            $fp = fopen('/dev/urandom', 'rb');
+        }
+        extract(unpack('Nrandom', fread($fp, 4)));
+
+        // 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);
+        $crypto->enableContinuousBuffer();
+    }
+
+    extract(unpack('Nrandom', $crypto->encrypt("\0\0\0\0")));
+    return abs($random) % ($max - $min) + $min;
+}
+?>