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-rw-r--r--plugins/OStatus/lib/magicsig.php159
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diff --git a/plugins/OStatus/lib/magicsig.php b/plugins/OStatus/lib/magicsig.php
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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';
+
+interface Magicsig
+{
+
+ public function sign($bytes);
+
+ public function verify($signed, $signature_b64);
+}
+
+class MagicsigRsaSha256
+{
+
+ public $keypair;
+
+ public function __construct($init = null)
+ {
+ if (is_null($init)) {
+ $this->generate();
+ } else {
+ $this->fromString($init);
+ }
+ }
+
+
+ public function generate($key_length = 512)
+ {
+ $keypair = new Crypt_RSA_KeyPair($key_length);
+ $params['public_key'] = $keypair->getPublicKey();
+ $params['private_key'] = $keypair->getPrivateKey();
+
+ $this->keypair = new Crypt_RSA($params);
+ }
+
+
+ public function toString($full_pair = true)
+ {
+ $public_key = $this->keypair->_public_key;
+ $private_key = $this->keypair->_private_key;
+
+ $mod = base64_url_encode($public_key->getModulus());
+ $exp = base64_url_encode($public_key->getExponent());
+ $private_exp = '';
+ if ($full_pair && $private_key->getExponent()) {
+ $private_exp = '.' . base64_url_encode($private_key->getExponent());
+ }
+
+ return 'RSA.' . $mod . '.' . $exp . $private_exp;
+ }
+
+ public function fromString($text)
+ {
+ // remove whitespace
+ $text = preg_replace('/\s+/', '', $text);
+
+ // parse components
+ if (!preg_match('/RSA\.([^\.]+)\.([^\.]+)(.([^\.]+))?/', $text, $matches)) {
+ return false;
+ }
+
+
+ $mod = base64_url_decode($matches[1]);
+ $exp = base64_url_decode($matches[2]);
+ if ($matches[4]) {
+ $private_exp = base64_url_decode($matches[4]);
+ }
+
+ $params['public_key'] = new Crypt_RSA_KEY($mod, $exp, 'public');
+ if ($params['public_key']->isError()) {
+ $error = $params['public_key']->getLastError();
+ print $error->getMessage();
+ exit;
+ }
+ if ($private_exp) {
+ $params['private_key'] = new Crypt_RSA_KEY($mod, $private_exp, 'private');
+ if ($params['private_key']->isError()) {
+ $error = $params['private_key']->getLastError();
+ print $error->getMessage();
+ exit;
+ }
+ }
+
+ $this->keypair = new Crypt_RSA($params);
+ }
+
+ public function getName()
+ {
+ return 'RSA-SHA256';
+ }
+
+ public function sign($bytes)
+ {
+ $sig = $this->keypair->createSign($bytes, null, 'sha256');
+ if ($this->keypair->isError()) {
+ $error = $this->keypair->getLastError();
+ common_log(LOG_DEBUG, 'RSA Error: '. $error->getMessage());
+ }
+
+ return $sig;
+ }
+
+ public function verify($signed_bytes, $signature)
+ {
+ $result = $this->keypair->validateSign($signed_bytes, $signature, null, 'sha256');
+ if ($this->keypair->isError()) {
+ $error = $this->keypair->getLastError();
+ //common_log(LOG_DEBUG, 'RSA Error: '. $error->getMessage());
+ print $error->getMessage();
+ }
+ return $result;
+ }
+
+}
+
+// Define a sha256 function for hashing
+// (Crypt_RSA should really be updated to use hash() )
+function sha256($bytes)
+{
+ return hash('sha256', $bytes);
+}
+
+function base64_url_encode($input)
+{
+ return strtr(base64_encode($input), '+/', '-_');
+}
+
+function base64_url_decode($input)
+{
+ return base64_decode(strtr($input, '-_', '+/'));
+} \ No newline at end of file