From 9a152a91c982d5f2ba07d0197ef2fe5eb8c8510c Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@devilix.net>
Date: Tue, 18 Feb 2014 16:29:53 +0200
Subject: Add an ext/hash compatibility layer (just hash_pbkdf2(), for now)

---
 system/core/compat/hash.php | 144 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 144 insertions(+)
 create mode 100644 system/core/compat/hash.php

(limited to 'system/core/compat')

diff --git a/system/core/compat/hash.php b/system/core/compat/hash.php
new file mode 100644
index 000000000..a9f59f110
--- /dev/null
+++ b/system/core/compat/hash.php
@@ -0,0 +1,144 @@
+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 5.2.4 or newer
+ *
+ * NOTICE OF LICENSE
+ *
+ * Licensed under the Open Software License version 3.0
+ *
+ * This source file is subject to the Open Software License (OSL 3.0) that is
+ * bundled with this package in the files license.txt / license.rst.  It is
+ * also available through the world wide web at this URL:
+ * http://opensource.org/licenses/OSL-3.0
+ * 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
+ * licensing@ellislab.com so we can send you a copy immediately.
+ *
+ * @package		CodeIgniter
+ * @author		EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
+ * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
+ * @link		http://codeigniter.com
+ * @since		Version 3.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * PHP ext/hash compatibility package
+ *
+ * @package		CodeIgniter
+ * @subpackage	CodeIgniter
+ * @category	Compatibility
+ * @author		Andrey Andreev
+ * @link		http://codeigniter.com/user_guide/
+ * @link		http://php.net/hash
+ */
+
+// ------------------------------------------------------------------------
+
+if (is_php('5.5'))
+{
+	return;
+}
+
+// ------------------------------------------------------------------------
+
+if ( ! function_exists('hash_pbkdf2'))
+{
+	/**
+	 * hash_pbkdf2()
+	 *
+	 * @link	http://php.net/hash_pbkdf2
+	 * @param	string	$algo
+	 * @param	string	$password
+	 * @param	string	$salt
+	 * @param	int	$iterations
+	 * @param	int	$length
+	 * @param	bool	$raw_output
+	 * @return	string
+	 */
+	function hash_pbkdf2($algo, $password, $salt, $iterations, $length = 0, $raw_output = FALSE)
+	{
+		if ( ! in_array($algo, hash_algos(), TRUE))
+		{
+			trigger_error('hash_pbkdf2(): Unknown hashing algorithm: '.$algo, E_USER_WARNING);
+			return FALSE;
+		}
+
+		if (($type = gettype($iterations)) !== 'integer')
+		{
+			if ($type === 'object' && method_exists($iterations, '__toString'))
+			{
+				$iterations = (string) $iterations;
+			}
+
+			if (is_string($iterations) && is_numeric($iterations))
+			{
+				$iterations = (int) $iterations;
+			}
+			else
+			{
+				trigger_error('hash_pbkdf2() expects parameter 4 to be long, '.$type.' given', E_USER_WARNING);
+				return NULL;
+			}
+		}
+
+		if ($iterations < 1)
+		{
+			trigger_error('hash_pbkdf2(): Iterations must be a positive integer: '.$iterations, E_USER_WARNING);
+			return FALSE;
+		}
+
+		if (($type = gettype($length)) !== 'integer')
+		{
+			if ($type === 'object' && method_exists($length, '__toString'))
+			{
+				$length = (string) $length;
+			}
+
+			if (is_string($length) && is_numeric($length))
+			{
+				$length = (int) $length;
+			}
+			else
+			{
+				trigger_error('hash_pbkdf2() expects parameter 5 to be long, '.$type.' given', E_USER_WARNING);
+				return NULL;
+			}
+		}
+
+		if ($length < 0)
+		{
+			trigger_error('hash_pbkdf2(): Length must be greater than or equal to 0: '.$length, E_USER_WARNING);
+			return FALSE;
+		}
+
+		$hash_length = strlen(hash($algo, NULL, TRUE));
+		if (empty($length))
+		{
+			$length = $hash_length;
+		}
+
+		$hash = '';
+		// Note: Blocks are NOT 0-indexed
+		for ($bc = ceil($length / $hash_length), $bi = 1; $bi <= $bc; $bi++)
+		{
+			$key = $derived_key = hash_hmac($algo, $salt.pack('N', $bi), $password, TRUE);
+			for ($i = 1; $i < $iterations; $i++)
+			{
+				$derived_key ^= $key = hash_hmac($algo, $key, $password, TRUE);
+			}
+
+			$hash .= $derived_key;
+		}
+
+		// This is not RFC-compatible, but we're aiming for natural PHP compatibility
+		return substr($raw_output ? $hash : bin2hex($hash), 0, $length);
+	}
+}
+
+/* End of file hash.php */
+/* Location: ./system/core/compat/hash.php */
\ No newline at end of file
-- 
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