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<?php
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* A sample module to show best practices for StatusNet plugins
*
* PHP version 5
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @package StatusNet
* @author James Walker <james@status.net>
* @copyright 2010 StatusNet, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
* @link http://status.net/
*/
require_once 'Crypt/RSA.php';
class Magicsig extends Memcached_DataObject
{
const PUBLICKEYREL = 'magic-public-key';
public $__table = 'magicsig';
public $user_id;
public $keypair;
public $alg;
private $publicKey;
private $privateKey;
public function __construct($alg = 'RSA-SHA256')
{
$this->alg = $alg;
}
public /*static*/ function staticGet($k, $v=null)
{
$obj = parent::staticGet(__CLASS__, $k, $v);
if (!empty($obj)) {
return Magicsig::fromString($obj->keypair);
}
return $obj;
}
function table()
{
return array(
'user_id' => DB_DATAOBJECT_INT,
'keypair' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
'alg' => DB_DATAOBJECT_STR
);
}
static function schemaDef()
{
return array(new ColumnDef('user_id', 'integer',
null, false, 'PRI'),
new ColumnDef('keypair', 'varchar',
255, false),
new ColumnDef('alg', 'varchar',
64, false));
}
function keys()
{
return array_keys($this->keyTypes());
}
function keyTypes()
{
return array('user_id' => 'K');
}
function sequenceKey() {
return array(false, false, false);
}
function insert()
{
$this->keypair = $this->toString();
return parent::insert();
}
public function generate($user_id, $key_length = 512)
{
// @fixme new key generation
$this->user_id = $user_id;
$this->insert();
}
public function toString($full_pair = true)
{
$mod = base64_url_encode($this->publicKey->modulus->toBytes());
$exp = base64_url_encode($this->publicKey->exponent->toBytes());
$private_exp = '';
if ($full_pair && $private_key->getExponent()) {
$private_exp = '.' . base64_url_encode($this->privateKey->exponent->toBytes());
}
return 'RSA.' . $mod . '.' . $exp . $private_exp;
}
public static function fromString($text)
{
$magic_sig = new Magicsig();
// remove whitespace
$text = preg_replace('/\s+/', '', $text);
// parse components
if (!preg_match('/RSA\.([^\.]+)\.([^\.]+)(.([^\.]+))?/', $text, $matches)) {
return false;
}
$mod = $matches[1];
$exp = $matches[2];
if (!empty($matches[4])) {
$private_exp = $matches[4];
} else {
$private_exp = false;
}
$magic_sig->loadKey($mod, $exp, 'public');
if ($private_exp) {
$magic_sig->loadKey($mod, $private_exp, 'private');
}
return $magic_sig;
}
public function loadKey($mod, $exp, $type = 'public')
{
common_log(LOG_DEBUG, "Adding ".$type." key: (".$mod .', '. $exp .")");
$rsa = new Crypt_RSA();
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
$rsa->setHash('sha256');
$rsa->modulus = new Math_BigInteger(base64_url_decode($mod), 256);
$rsa->k = strlen($rsa->modulus->toBytes());
$rsa->exponent = new Math_BigInteger(base64_url_decode($exp), 256);
if ($type == 'private') {
$this->privateKey = $rsa;
} else {
$this->publicKey = $rsa;
}
}
public function getName()
{
return $this->alg;
}
public function getHash()
{
switch ($this->alg) {
case 'RSA-SHA256':
return 'magicsig_sha256';
}
}
public function sign($bytes)
{
$sig = $this->privateKey->sign($bytes);
return base64_url_encode($sig);
}
public function verify($signed_bytes, $signature)
{
$signature = base64_url_decode($signature);
return $this->publicKey->verify($signed_bytes, $signature);
}
}
function base64_url_encode($input)
{
return strtr(base64_encode($input), '+/', '-_');
}
function base64_url_decode($input)
{
return base64_decode(strtr($input, '-_', '+/'));
}
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