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<?php
/**
* Implements the Pbkdf2Password class for the MediaWiki software.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
*/
/**
* A PBKDF2-hashed password
*
* This is a computationally complex password hash for use in modern applications.
* The number of rounds can be configured by $wgPasswordConfig['pbkdf2']['cost'].
*
* @since 1.24
*/
class Pbkdf2Password extends ParameterizedPassword {
protected function getDefaultParams() {
return array(
'algo' => $this->config['algo'],
'rounds' => $this->config['cost'],
'length' => $this->config['length']
);
}
protected function getDelimiter() {
return ':';
}
public function crypt( $password ) {
if ( count( $this->args ) == 0 ) {
$this->args[] = base64_encode( MWCryptRand::generate( 16, true ) );
}
if ( function_exists( 'hash_pbkdf2' ) ) {
$hash = hash_pbkdf2(
$this->params['algo'],
$password,
base64_decode( $this->args[0] ),
(int)$this->params['rounds'],
(int)$this->params['length'],
true
);
if ( !is_string( $hash ) ) {
throw new PasswordError( 'Error when hashing password.' );
}
} else {
$hashLenHash = hash( $this->params['algo'], '', true );
if ( !is_string( $hashLenHash ) ) {
throw new PasswordError( 'Error when hashing password.' );
}
$hashLen = strlen( $hashLenHash );
$blockCount = ceil( $this->params['length'] / $hashLen );
$hash = '';
$salt = base64_decode( $this->args[0] );
for ( $i = 1; $i <= $blockCount; ++$i ) {
$roundTotal = $lastRound = hash_hmac(
$this->params['algo'],
$salt . pack( 'N', $i ),
$password,
true
);
for ( $j = 1; $j < $this->params['rounds']; ++$j ) {
$lastRound = hash_hmac( $this->params['algo'], $lastRound, $password, true );
$roundTotal ^= $lastRound;
}
$hash .= $roundTotal;
}
$hash = substr( $hash, 0, $this->params['length'] );
}
$this->hash = base64_encode( $hash );
}
}
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