1 files changed, 104 insertions, 0 deletions
diff --git a/phpBB/phpbb/passwords/helper.php b/phpBB/phpbb/passwords/helper.php
new file mode 100644
index 0000000000..c2a49202cd
--- /dev/null
+++ b/phpBB/phpbb/passwords/helper.php
@@ -0,0 +1,104 @@
+<?php
+/**
+*
+* This file is part of the phpBB Forum Software package.
+*
+* @copyright (c) phpBB Limited <https://www.phpbb.com>
+* @license GNU General Public License, version 2 (GPL-2.0)
+*
+* For full copyright and license information, please see
+* the docs/CREDITS.txt file.
+*
+*/
+
+namespace phpbb\passwords;
+
+class helper
+{
+	/**
+	* Get hash settings from combined hash
+	*
+	* @param string $hash Password hash of combined hash
+	*
+	* @return array An array containing the hash settings for the hash
+	*		types in successive order as described by the combined
+	*		password hash or an empty array if hash does not
+	*		properly fit the combined hash format
+	*/
+	public function get_combined_hash_settings($hash)
+	{
+		$output = array();
+
+		preg_match('#^\$([a-zA-Z0-9\\\]*?)\$#', $hash, $match);
+		$hash_settings = substr($hash, strpos($hash, $match[1]) + strlen($match[1]) + 1);
+		$matches = explode('\\', $match[1]);
+		foreach ($matches as $cur_type)
+		{
+			$dollar_position = strpos($hash_settings, '$');
+			$output[] = substr($hash_settings, 0, ($dollar_position != false) ? $dollar_position : strlen($hash_settings));
+			$hash_settings = substr($hash_settings, $dollar_position + 1);
+		}
+
+		return $output;
+	}
+
+	/**
+	* Combine hash prefixes, settings, and actual hash
+	*
+	* @param array $data Array containing the keys 'prefix' and 'settings'.
+	*			It will hold the prefixes and settings
+	* @param string $type Data type of the supplied value
+	* @param string $value Value that should be put into the data array
+	*
+	* @return string|null Return complete combined hash if type is neither
+	*			'prefix' nor 'settings', nothing if it is
+	*/
+	public function combine_hash_output(&$data, $type, $value)
+	{
+		if ($type == 'prefix')
+		{
+			$data[$type] .= ($data[$type] !== '$') ? '\\' : '';
+			$data[$type] .= str_replace('$', '', $value);
+		}
+		else if ($type == 'settings')
+		{
+			$data[$type] .= ($data[$type] !== '$') ? '$' : '';
+			$data[$type] .= $value;
+		}
+		else
+		{
+			// Return full hash
+			return $data['prefix'] . $data['settings'] . '$' . $value;
+		}
+	}
+
+	/**
+	* Rebuild hash for hashing functions
+	*
+	* @param string $prefix Hash prefix
+	* @param string $settings Hash settings
+	*
+	* @return string Rebuilt hash for hashing functions
+	*/
+	public function rebuild_hash($prefix, $settings)
+	{
+		$rebuilt_hash = $prefix;
+		if (strpos($settings, '\\') !== false)
+		{
+			$settings = str_replace('\\', '$', $settings);
+		}
+		$rebuilt_hash .= $settings;
+		return $rebuilt_hash;
+	}
+
+	/**
+	* Obtain only the actual hash after the prefixes
+	*
+	* @param string		$hash The full password hash
+	* @return string	Actual hash (incl. settings)
+	*/
+	public function obtain_hash_only($hash)
+	{
+		return substr($hash, strripos($hash, '$') + 1);
+	}
+}