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<?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);
}
}
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