From f4b34d67c54022b70185e83fe628c17e3656d91f Mon Sep 17 00:00:00 2001
From: James Walker <walkah@walkah.net>
Date: Mon, 22 Feb 2010 23:11:40 -0500
Subject: [PATCH] generate keypairs for users, and put them in the XRD for
 discovery

---
 plugins/OStatus/OStatusPlugin.php     |  1 +
 plugins/OStatus/actions/webfinger.php | 11 ++++++
 plugins/OStatus/classes/Magicsig.php  | 55 +++++++++++++++++++++------
 3 files changed, 55 insertions(+), 12 deletions(-)

diff --git a/plugins/OStatus/OStatusPlugin.php b/plugins/OStatus/OStatusPlugin.php
index 472008419a..db4a0af358 100644
--- a/plugins/OStatus/OStatusPlugin.php
+++ b/plugins/OStatus/OStatusPlugin.php
@@ -312,6 +312,7 @@ class OStatusPlugin extends Plugin
         $schema->ensureTable('ostatus_source', Ostatus_source::schemaDef());
         $schema->ensureTable('feedsub', FeedSub::schemaDef());
         $schema->ensureTable('hubsub', HubSub::schemaDef());
+        $schema->ensureTable('magicsig', Magicsig::schemaDef());
         return true;
     }
 
diff --git a/plugins/OStatus/actions/webfinger.php b/plugins/OStatus/actions/webfinger.php
index cf60b8069d..fbbd8d0397 100644
--- a/plugins/OStatus/actions/webfinger.php
+++ b/plugins/OStatus/actions/webfinger.php
@@ -71,6 +71,17 @@ class WebfingerAction extends Action
         $xrd->links[] = array('rel' => 'salmon',
                               'href' => $salmon_url);
 
+        // Get this user's keypair
+        $magickey = Magicsig::staticGet('user_id', $this->user->id);
+        if (!$magickey) {
+            // No keypair yet, let's generate one.
+            $magickey = new Magicsig();
+            $magickey->generate();
+        }
+        
+        $xrd->links[] = array('rel' => Magicsig::PUBLICKEYREL,
+                              'href' => 'data:application/magic-public-key;'. $magickey->keypair);
+        
         // TODO - finalize where the redirect should go on the publisher
         $url = common_local_url('ostatussub') . '?profile={uri}';
         $xrd->links[] = array('rel' => 'http://ostatus.org/schema/1.0/subscribe',
diff --git a/plugins/OStatus/classes/Magicsig.php b/plugins/OStatus/classes/Magicsig.php
index 6d09c54ecb..85664bbf9d 100644
--- a/plugins/OStatus/classes/Magicsig.php
+++ b/plugins/OStatus/classes/Magicsig.php
@@ -32,6 +32,8 @@ require_once 'Crypt/RSA.php';
 class Magicsig extends Memcached_DataObject
 {
 
+    const PUBLICKEYREL = 'magic-public-key';
+    
     public $__table = 'magicsig';
 
     public $user_id;
@@ -40,6 +42,11 @@ class Magicsig extends Memcached_DataObject
     
     private $_rsa;
 
+    public function __construct($alg = 'RSA-SHA256')
+    {
+        $this->alg = $alg;
+    }
+    
     public /*static*/ function staticGet($k, $v=null)
     {
         return parent::staticGet(__CLASS__, $k, $v);
@@ -75,23 +82,33 @@ class Magicsig extends Memcached_DataObject
     {
         return array('user_id' => 'K');
     }
+
+    function insert()
+    {
+        $this->keypair = $this->toString();
+
+        return parent::insert();
+    }
     
     public function generate($key_length = 512)
     {
+        PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
+
         $keypair = new Crypt_RSA_KeyPair($key_length);
         $params['public_key'] = $keypair->getPublicKey();
         $params['private_key'] = $keypair->getPrivateKey();
 
-        PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
-        $this->keypair = new Crypt_RSA($params);
+        $this->_rsa = new Crypt_RSA($params);
         PEAR::popErrorHandling();
+
+        $this->insert();
     }
 
 
     public function toString($full_pair = true)
     {
-        $public_key = $this->keypair->_public_key;
-        $private_key = $this->keypair->_private_key;
+        $public_key = $this->_rsa->_public_key;
+        $private_key = $this->_rsa->_private_key;
 
         $mod = base64_url_encode($public_key->getModulus());
         $exp = base64_url_encode($public_key->getExponent());
@@ -103,10 +120,12 @@ class Magicsig extends Memcached_DataObject
         return 'RSA.' . $mod . '.' . $exp . $private_exp; 
     }
     
-    public function fromString($text)
+    public static function fromString($text)
     {
         PEAR::pushErrorHandling(PEAR_ERROR_RETURN);
 
+        $magic_sig = new Magicsig();
+        
         // remove whitespace
         $text = preg_replace('/\s+/', '', $text);
 
@@ -136,20 +155,32 @@ class Magicsig extends Memcached_DataObject
             }
         }
 
-        $this->keypair = new Crypt_RSA($params);
+        $magic_sig->_rsa = new Crypt_RSA($params);
         PEAR::popErrorHandling();
+
+        return $magic_sig;
     }
 
     public function getName()
     {
-        return 'RSA-SHA256';
+        $this->alg;
     }
 
+    public function getHash()
+    {
+        switch ($this->alg) {
+
+        case 'RSA-SHA256':
+            return 'sha256';
+        }
+
+    }
+    
     public function sign($bytes)
     {
-        $sig = $this->keypair->createSign($bytes, null, 'sha256');
-        if ($this->keypair->isError()) {
-            $error = $this->keypair->getLastError();
+        $sig = $this->_rsa->createSign($bytes, null, 'sha256');
+        if ($this->_rsa->isError()) {
+            $error = $this->_rsa->getLastError();
             common_log(LOG_DEBUG, 'RSA Error: '. $error->getMessage());
         }
 
@@ -158,8 +189,8 @@ class Magicsig extends Memcached_DataObject
 
     public function verify($signed_bytes, $signature)
     {
-        $result =  $this->keypair->validateSign($signed_bytes, $signature, null, 'sha256');
-        if ($this->keypair->isError()) {
+        $result =  $this->_rsa->validateSign($signed_bytes, $signature, null, 'sha256');
+        if ($this->_rsa->isError()) {
             $error = $this->keypair->getLastError();
             //common_log(LOG_DEBUG, 'RSA Error: '. $error->getMessage());
             print $error->getMessage();