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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\driver;
/**
*
* @version Version 0.1 / slightly modified for phpBB 3.1.x (using $H$ as hash type identifier)
*
* Portable PHP password hashing framework.
*
* Written by Solar Designer <solar at openwall.com> in 2004-2006 and placed in
* the public domain.
*
* There's absolutely no warranty.
*
* The homepage URL for this framework is:
*
* http://www.openwall.com/phpass/
*
* Please be sure to update the Version line if you edit this file in any way.
* It is suggested that you leave the main version number intact, but indicate
* your project name (after the slash) and add your own revision information.
*
* Please do not change the "private" password hashing method implemented in
* here, thereby making your hashes incompatible. However, if you must, please
* change the hash type identifier (the "$P$") to something different.
*
* Obviously, since this code is in the public domain, the above are not
* requirements (there can be none), but merely suggestions.
*
*/
/**
* @package passwords
*/
class salted_md5 extends base
{
const PREFIX = '$H$';
/**
* @inheritdoc
*/
public function get_prefix()
{
return self::PREFIX;
}
/**
* @inheritdoc
*/
public function hash($password, $setting = '')
{
if ($setting)
{
if (($settings = $this->get_hash_settings($setting)) === false)
{
// Return md5 of password if settings do not
// comply with our standards. This will only
// happen if pre-determined settings are
// directly passed to the driver. The manager
// will not do this. Same as the old hashing
// implementatio in phpBB 3.0
return md5($password);
}
}
else
{
$settings = $this->get_hash_settings($this->generate_salt());
}
$hash = md5($settings['salt'] . $password, true);
do
{
$hash = md5($hash . $password, true);
}
while (--$settings['count']);
$output = $settings['full'];
$output .= $this->helper->hash_encode64($hash, 16);
return $output;
}
/**
* @inheritdoc
*/
public function check($password, $hash)
{
if (strlen($hash) !== 34)
{
return md5($password) === $hash;
}
return $hash === $this->hash($password, $hash);
}
/**
* Generate salt for hashing method
*
* @return string Salt for hashing method
*/
protected function generate_salt()
{
$count = 6;
$random = $this->helper->get_random_salt($count);
$salt = $this->get_prefix();
$salt .= $this->helper->itoa64[min($count + 5, 30)];
$salt .= $this->helper->hash_encode64($random, $count);
return $salt;
}
/**
* Get hash settings
*
* @param string $hash The hash that contains the settings
*
* @return bool|array Array containing the count_log2, salt, and full
* hash settings string or false if supplied hash is empty
* or contains incorrect settings
*/
public function get_hash_settings($hash)
{
if (empty($hash))
{
return false;
}
$count_log2 = strpos($this->helper->itoa64, $hash[3]);
$salt = substr($hash, 4, 8);
if ($count_log2 < 7 || $count_log2 > 30 || strlen($salt) != 8)
{
return false;
}
return array(
'count' => 1 << $count_log2,
'salt' => $salt,
'full' => substr($hash, 0, 12),
);
}
/**
* @inheritdoc
*/
public function get_settings_only($hash, $full = false)
{
return substr($hash, 3, 9);
}
}
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