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<?php
/**
*
* @package phpBB3
* @copyright (c) 2013 phpBB Group
* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
*
*/
namespace phpbb\passwords;
/**
* @package passwords
*/
class helper
{
/**
* @var phpbb\passwords\manager
*/
protected $manager;
/**
* Set the passwords manager instance
*
* @param phpbb\passwords\manager $manager Crypto manager object
*/
public function set_manager(\phpbb\passwords\manager $manager)
{
if ($this->manager === null)
{
$this->manager = $manager;
}
}
/**
* Get hash settings from combined hash
*
* @param string $hash Password hash of combined hash
*
* @return array An array containing the hash settings for the hash
* types in successive order as described by the comined
* password hash
*/
protected function get_combined_hash_settings($hash)
{
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;
}
/**
* Create combined hash from already hashed password
*
* @param string $password_hash Complete current password hash
* @param string $type Type of the hashing algorithm the password hash
* should be combined with
* @return string|bool Combined password hash if combined hashing was
* successful, else false
*/
public function combined_hash_password($password_hash, $type)
{
$data = array(
'prefix' => '$',
'settings' => '$',
);
$hash_settings = $this->get_combined_hash_settings($password_hash);
$hash = $hash_settings[0];
// Put settings of current hash into data array
$stored_hash_type = $this->manager->detect_algorithm($password_hash);
$this->combine_hash_output($data, 'prefix', $stored_hash_type->get_prefix());
$this->combine_hash_output($data, 'settings', $stored_hash_type->get_settings_only($password_hash));
// Hash current hash with the defined types
foreach ($type as $cur_type)
{
if (isset($this->manager->algorithms[$cur_type]))
{
$new_hash_type = $this->manager->algorithms[$cur_type];
}
else
{
return false;
}
$new_hash = $new_hash_type->hash(str_replace($stored_hash_type->get_settings_only($password_hash), '', $hash));
$this->combine_hash_output($data, 'prefix', $new_hash_type->get_prefix());
$this->combine_hash_output($data, 'settings', substr(str_replace('$', '\\', $new_hash_type->get_settings_only($new_hash, true)), 0));
$hash = str_replace($new_hash_type->get_settings_only($new_hash), '', $this->obtain_hash_only($new_hash));
}
return $this->combine_hash_output($data, 'hash', $hash);
}
/**
* Check combined password hash against the supplied password
*
* @param string $password Password entered by user
* @param array $stored_hash_type An array containing the hash types
* as described by stored password hash
* @param string $hash Stored password hash
*
* @return bool True if password is correct, false if not
*/
public function check_combined_hash($password, $stored_hash_type, $hash)
{
$i = 0;
$data = array(
'prefix' => '$',
'settings' => '$',
);
$hash_settings = $this->get_combined_hash_settings($hash);
foreach ($stored_hash_type as $key => $hash_type)
{
$rebuilt_hash = $this->rebuild_hash($hash_type->get_prefix(), $hash_settings[$i]);
$this->combine_hash_output($data, 'prefix', $key);
$this->combine_hash_output($data, 'settings', $hash_settings[$i]);
$cur_hash = $hash_type->hash($password, $rebuilt_hash);
$password = str_replace($rebuilt_hash, '', $cur_hash);
$i++;
}
return ($hash === $this->combine_hash_output($data, 'hash', $password));
}
/**
* 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 $value Value that should be put into the data array
*
* @return string|none Return complete combined hash if type is neither
* 'prefix' nor 'settings', nothing if it is
*/
protected function combine_hash_output(&$data, $type, $value)
{
if ($type == 'prefix')
{
$data[$type] .= ($data[$type] !== '$') ? '\\' : '';
$data[$type] .= str_replace('$', '', $value);
}
elseif ($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 $settings Hash settings
*
* @return string Rebuilt hash for hashing functions
*/
protected function rebuild_hash($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 $hash The full password hash
* @return string Actual hash (incl. settings)
*/
protected function obtain_hash_only($hash)
{
return substr($hash, strripos($hash, '$') + 1);
}
}
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