moving magicsig.php to classes - to add storage

1 files changed, 155 insertions, 0 deletions

diff --git a/plugins/OStatus/classes/Magicsig.php b/plugins/OStatus/classes/Magicsig.php
new file mode 100644
index 000000000..9d9d32744
--- /dev/null
+++ b/plugins/OStatus/classes/Magicsig.php
@@ -0,0 +1,155 @@
+<?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
+{
+
+    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();
+
+        PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
+        $this->keypair = new Crypt_RSA($params);
+        PEAR::popErrorHandling();
+    }
+
+
+    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)
+    {
+        PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
+
+        // 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);
+        PEAR::popErrorHandling();
+    }
+
+    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, '-_', '+/'));
+}
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