3 * StatusNet - the distributed open-source microblogging tool
4 * Copyright (C) 2010, StatusNet, Inc.
6 * A sample module to show best practices for StatusNet plugins
10 * This program is free software: you can redistribute it and/or modify
11 * it under the terms of the GNU Affero General Public License as published by
12 * the Free Software Foundation, either version 3 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Affero General Public License for more details.
20 * You should have received a copy of the GNU Affero General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * @author James Walker <james@status.net>
25 * @copyright 2010 StatusNet, Inc.
26 * @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
27 * @link http://status.net/
30 require_once 'Crypt/RSA.php';
32 class Magicsig extends Memcached_DataObject
35 const PUBLICKEYREL = 'magic-public-key';
37 public $__table = 'magicsig';
46 public function __construct($alg = 'RSA-SHA256')
51 public /*static*/ function staticGet($k, $v=null)
53 $obj = parent::staticGet(__CLASS__, $k, $v);
55 $obj = Magicsig::fromString($obj->keypair);
57 // Double check keys: Crypt_RSA did not
58 // consistently generate good keypairs.
59 // We've also moved to 1024 bit keys.
60 if (strlen($obj->publicKey->modulus->toBits()) != 1024) {
73 'user_id' => DB_DATAOBJECT_INT,
74 'keypair' => DB_DATAOBJECT_STR + DB_DATAOBJECT_NOTNULL,
75 'alg' => DB_DATAOBJECT_STR
79 static function schemaDef()
81 return array(new ColumnDef('user_id', 'integer',
83 new ColumnDef('keypair', 'text',
85 new ColumnDef('alg', 'varchar',
92 return array_keys($this->keyTypes());
97 return array('user_id' => 'K');
100 function sequenceKey() {
101 return array(false, false, false);
106 $this->keypair = $this->toString();
108 return parent::insert();
111 public function generate($user_id)
113 $rsa = new Crypt_RSA();
115 $keypair = $rsa->createKey();
117 $rsa->loadKey($keypair['privatekey']);
119 $this->privateKey = new Crypt_RSA();
120 $this->privateKey->loadKey($keypair['privatekey']);
122 $this->publicKey = new Crypt_RSA();
123 $this->publicKey->loadKey($keypair['publickey']);
125 $this->user_id = $user_id;
130 public function toString($full_pair = true)
132 $mod = Magicsig::base64_url_encode($this->publicKey->modulus->toBytes());
133 $exp = Magicsig::base64_url_encode($this->publicKey->exponent->toBytes());
135 if ($full_pair && $this->privateKey->exponent->toBytes()) {
136 $private_exp = '.' . Magicsig::base64_url_encode($this->privateKey->exponent->toBytes());
139 return 'RSA.' . $mod . '.' . $exp . $private_exp;
142 public static function fromString($text)
144 $magic_sig = new Magicsig();
147 $text = preg_replace('/\s+/', '', $text);
150 if (!preg_match('/RSA\.([^\.]+)\.([^\.]+)(.([^\.]+))?/', $text, $matches)) {
156 if (!empty($matches[4])) {
157 $private_exp = $matches[4];
159 $private_exp = false;
162 $magic_sig->loadKey($mod, $exp, 'public');
164 $magic_sig->loadKey($mod, $private_exp, 'private');
170 public function loadKey($mod, $exp, $type = 'public')
172 common_log(LOG_DEBUG, "Adding ".$type." key: (".$mod .', '. $exp .")");
174 $rsa = new Crypt_RSA();
175 $rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
176 $rsa->setHash('sha256');
177 $rsa->modulus = new Math_BigInteger(Magicsig::base64_url_decode($mod), 256);
178 $rsa->k = strlen($rsa->modulus->toBytes());
179 $rsa->exponent = new Math_BigInteger(Magicsig::base64_url_decode($exp), 256);
181 if ($type == 'private') {
182 $this->privateKey = $rsa;
184 $this->publicKey = $rsa;
188 public function getName()
193 public function getHash()
195 switch ($this->alg) {
203 public function sign($bytes)
205 $sig = $this->privateKey->sign($bytes);
206 return Magicsig::base64_url_encode($sig);
209 public function verify($signed_bytes, $signature)
211 $signature = Magicsig::base64_url_decode($signature);
212 return $this->publicKey->verify($signed_bytes, $signature);
216 public static function base64_url_encode($input)
218 return strtr(base64_encode($input), '+/', '-_');
221 public static function base64_url_decode($input)
223 return base64_decode(strtr($input, '-_', '+/'));