From eba717f95f586d2538007bd18da6e9b32b076c30 Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Fri, 31 Oct 2008 22:12:14 +0000
Subject: Merge over vendor code.

git-svn-id: http://gallery.svn.sourceforge.net/svnroot/gallery/trunk/eval/gx/gallery3/trunk@18408 57fcd75e-5312-0410-8df3-f5eb6fbb1595
---
 kohana/libraries/Encrypt.php | 164 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 164 insertions(+)
 create mode 100644 kohana/libraries/Encrypt.php

(limited to 'kohana/libraries/Encrypt.php')

diff --git a/kohana/libraries/Encrypt.php b/kohana/libraries/Encrypt.php
new file mode 100644
index 00000000..38c094f0
--- /dev/null
+++ b/kohana/libraries/Encrypt.php
@@ -0,0 +1,164 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ * The Encrypt library provides two-way encryption of text and binary strings
+ * using the MCrypt extension.
+ * @see http://php.net/mcrypt
+ *
+ * $Id$
+ *
+ * @package    Core
+ * @author     Kohana Team
+ * @copyright  (c) 2007-2008 Kohana Team
+ * @license    http://kohanaphp.com/license.html
+ */
+class Encrypt_Core {
+
+	// OS-dependant RAND type to use
+	protected static $rand;
+
+	// Configuration
+	protected $config;
+
+	/**
+	 * Returns a singleton instance of Encrypt.
+	 *
+	 * @param   array  configuration options
+	 * @return  Encrypt_Core
+	 */
+	public static function instance($config = NULL)
+	{
+		static $instance;
+
+		// Create the singleton
+		empty($instance) and $instance = new Encrypt((array) $config);
+
+		return $instance;
+	}
+
+	/**
+	 * Loads encryption configuration and validates the data.
+	 *
+	 * @param   array|string      custom configuration or config group name
+	 * @throws  Kohana_Exception
+	 */
+	public function __construct($config = FALSE)
+	{
+		if ( ! defined('MCRYPT_ENCRYPT'))
+			throw new Kohana_Exception('encrypt.requires_mcrypt');
+
+		if (is_string($config))
+		{
+			$name = $config;
+
+			// Test the config group name
+			if (($config = Kohana::config('encryption.'.$config)) === NULL)
+				throw new Kohana_Exception('encrypt.undefined_group', $name);
+		}
+
+		if (is_array($config))
+		{
+			// Append the default configuration options
+			$config += Kohana::config('encryption.default');
+		}
+		else
+		{
+			// Load the default group
+			$config = Kohana::config('encryption.default');
+		}
+
+		if (empty($config['key']))
+			throw new Kohana_Exception('encrypt.no_encryption_key');
+
+		// Find the max length of the key, based on cipher and mode
+		$size = mcrypt_get_key_size($config['cipher'], $config['mode']);
+
+		if (strlen($config['key']) > $size)
+		{
+			// Shorten the key to the maximum size
+			$config['key'] = substr($config['key'], 0, $size);
+		}
+
+		// Find the initialization vector size
+		$config['iv_size'] = mcrypt_get_iv_size($config['cipher'], $config['mode']);
+
+		// Cache the config in the object
+		$this->config = $config;
+
+		Kohana::log('debug', 'Encrypt Library initialized');
+	}
+
+	/**
+	 * Encrypts a string and returns an encrypted string that can be decoded.
+	 *
+	 * @param   string  data to be encrypted
+	 * @return  string  encrypted data
+	 */
+	public function encode($data)
+	{
+		// Set the rand type if it has not already been set
+		if (self::$rand === NULL)
+		{
+			if (KOHANA_IS_WIN)
+			{
+				// Windows only supports the system random number generator
+				self::$rand = MCRYPT_RAND;
+			}
+			else
+			{
+				if (defined('MCRYPT_DEV_URANDOM'))
+				{
+					// Use /dev/urandom
+					self::$rand = MCRYPT_DEV_URANDOM;
+				}
+				elseif (defined('MCRYPT_DEV_RANDOM'))
+				{
+					// Use /dev/random
+					self::$rand = MCRYPT_DEV_RANDOM;
+				}
+				else
+				{
+					// Use the system random number generator
+					self::$rand = MCRYPT_RAND;
+				}
+			}
+		}
+
+		if (self::$rand === MCRYPT_RAND)
+		{
+			// The system random number generator must always be seeded each
+			// time it is used, or it will not produce true random results
+			mt_srand();
+		}
+
+		// Create a random initialization vector of the proper size for the current cipher
+		$iv = mcrypt_create_iv($this->config['iv_size'], self::$rand);
+
+		// Encrypt the data using the configured options and generated iv
+		$data = mcrypt_encrypt($this->config['cipher'], $this->config['key'], $data, $this->config['mode'], $iv);
+
+		// Use base64 encoding to convert to a string
+		return base64_encode($iv.$data);
+	}
+
+	/**
+	 * Decrypts an encoded string back to its original value.
+	 *
+	 * @param   string  encoded string to be decrypted
+	 * @return  string  decrypted data
+	 */
+	public function decode($data)
+	{
+		// Convert the data back to binary
+		$data = base64_decode($data);
+
+		// Extract the initialization vector from the data
+		$iv = substr($data, 0, $this->config['iv_size']);
+
+		// Remove the iv from the data
+		$data = substr($data, $this->config['iv_size']);
+
+		// Return the decrypted data, trimming the \0 padding bytes from the end of the data
+		return rtrim(mcrypt_decrypt($this->config['cipher'], $this->config['key'], $data, $this->config['mode'], $iv), "\0");
+	}
+
+} // End Encrypt
-- 
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