diff -r 000000000000 -r 4eba9c11703f web/Zend/Crypt/Math/BigInteger.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Crypt/Math/BigInteger.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,117 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Crypt
+ * @subpackage Math
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: BigInteger.php 23439 2010-11-23 21:10:14Z alexander $
+ */
+
+/**
+ * Support for arbitrary precision mathematics in PHP.
+ *
+ * Zend_Crypt_Math_BigInteger is a wrapper across three PHP extensions: bcmath, gmp
+ * and big_int. Since each offer similar functionality, but availability of
+ * each differs across installations of PHP, this wrapper attempts to select
+ * the fastest option available and encapsulate a subset of its functionality
+ * which all extensions share in common.
+ *
+ * This class requires one of the three extensions to be available. BCMATH
+ * while the slowest, is available by default under Windows, and under Unix
+ * if PHP is compiled with the flag "--enable-bcmath". GMP requires the gmp
+ * library from http://www.swox.com/gmp/ and PHP compiled with the "--with-gmp"
+ * flag. BIG_INT support is available from a big_int PHP library available from
+ * only from PECL (a Windows port is not available).
+ *
+ * @category   Zend
+ * @package    Zend_Crypt
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Crypt_Math_BigInteger
+{
+
+    /**
+     * Holds an instance of one of the three arbitrary precision wrappers.
+     *
+     * @var Zend_Crypt_Math_BigInteger_Interface
+     */
+    protected $_math = null;
+
+    /**
+     * Constructor; a Factory which detects a suitable PHP extension for
+     * arbitrary precision math and instantiates the suitable wrapper
+     * object.
+     *
+     * @param string $extension
+     * @throws  Zend_Crypt_Math_BigInteger_Exception
+     */
+    public function __construct($extension = null)
+    {
+        if ($extension !== null && !in_array($extension, array('bcmath', 'gmp', 'bigint'))) {
+            require_once('Zend/Crypt/Math/BigInteger/Exception.php');
+            throw new Zend_Crypt_Math_BigInteger_Exception('Invalid extension type; please use one of bcmath, gmp or bigint');
+        }
+        $this->_loadAdapter($extension);
+    }
+
+    /**
+     * Redirect all public method calls to the wrapped extension object.
+     *
+     * @param   string $methodName
+     * @param   array $args
+     * @throws  Zend_Crypt_Math_BigInteger_Exception
+     */
+    public function __call($methodName, $args)
+    {
+        if(!method_exists($this->_math, $methodName)) {
+            require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
+            throw new Zend_Crypt_Math_BigInteger_Exception('invalid method call: ' . get_class($this->_math) . '::' . $methodName . '() does not exist');
+        }
+        return call_user_func_array(array($this->_math, $methodName), $args);
+    }
+
+    /**
+     * @param string $extension
+     * @throws  Zend_Crypt_Math_BigInteger_Exception
+     */
+    protected function _loadAdapter($extension = null)
+    {
+        if ($extension === null) {
+            if (extension_loaded('gmp')) {
+                $extension = 'gmp';
+            //} elseif (extension_loaded('big_int')) {
+            //    $extension = 'big_int';
+            } else {
+                $extension = 'bcmath';
+            }
+        }
+        if($extension == 'gmp' && extension_loaded('gmp')) {
+            require_once 'Zend/Crypt/Math/BigInteger/Gmp.php';
+            $this->_math = new Zend_Crypt_Math_BigInteger_Gmp();
+        //} elseif($extension == 'bigint' && extension_loaded('big_int')) {
+        //    require_once 'Zend/Crypt_Math/BigInteger/Bigint.php';
+        //    $this->_math = new Zend_Crypt_Math_BigInteger_Bigint();
+        } elseif ($extension == 'bcmath' && extension_loaded('bcmath')) {
+            require_once 'Zend/Crypt/Math/BigInteger/Bcmath.php';
+            $this->_math = new Zend_Crypt_Math_BigInteger_Bcmath();
+        } else {
+            require_once 'Zend/Crypt/Math/BigInteger/Exception.php';
+            throw new Zend_Crypt_Math_BigInteger_Exception($extension . ' big integer precision math support not detected');
+        }
+    }
+
+}
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