Excise M2Crypto!

This required rewriting our Diffie-Hellman-Merkle implementation for
set_admin_password in xen. Fixes bug 917851.

Change-Id: Ic4cdcc06221f003aec2dcd5ba05a1a9ad19d39c9

doc/source/devref/development.environment.rst

@@ -54,22 +54,16 @@ Install the prerequisite packages.
 
 On Ubuntu::
 
-  sudo apt-get install python-dev swig libssl-dev python-pip git-core
+  sudo apt-get install python-dev libssl-dev python-pip git-core
 
 On Fedora-based distributions (e.g., Fedora/RHEL/CentOS/Scientific Linux)::
 
-  sudo yum install python-devel swig openssl-devel python-pip git
+  sudo yum install python-devel openssl-devel python-pip git
 
 
 Mac OS X Systems
 ----------------
 
-Install swig, which is needed to build the M2Crypto Python package. If you are
-using the `homebrew <http://mxcl.github.com/homebrew/>`_, package manager,
-install swig by doing::
-
-    brew install swig
-
 Install virtualenv::
 
     sudo easy_install virtualenv
@@ -120,7 +114,7 @@ You can manually install the virtual environment instead of having
 
 This will install all of the Python packages listed in the
 ``tools/pip-requires`` file into your virtualenv. There will also be some
-additional packages (pip, distribute, greenlet, M2Crypto) that are installed
+additional packages (pip, distribute, greenlet) that are installed
 by the ``tools/install_venv.py`` file into the virutalenv.
 
 If all goes well, you should get a message something like this::

nova/scheduler/distributed_scheduler.py

@@ -22,8 +22,6 @@ Weighing Functions.
 import json
 import operator
 
-import M2Crypto
-
 from novaclient import v1_1 as novaclient
 from novaclient import exceptions as novaclient_exceptions
 from nova import crypto
@@ -43,11 +41,6 @@ FLAGS = flags.FLAGS
 LOG = logging.getLogger('nova.scheduler.distributed_scheduler')
 
 
-class InvalidBlob(exception.NovaException):
-    message = _("Ill-formed or incorrectly routed 'blob' data sent "
-            "to instance create request.")
-
-
 class DistributedScheduler(driver.Scheduler):
     """Scheduler that can work across any nova deployment, from simple
     deployments to multiple nested zones.
@@ -185,19 +178,16 @@ class DistributedScheduler(driver.Scheduler):
         or None if invalid. Broken out for testing.
         """
         decryptor = crypto.decryptor(FLAGS.build_plan_encryption_key)
-        try:
-            json_entry = decryptor(blob)
-            # Extract our WeightedHost values
-            wh_dict = json.loads(json_entry)
-            host = wh_dict.get('host', None)
-            blob = wh_dict.get('blob', None)
-            zone = wh_dict.get('zone', None)
-            return least_cost.WeightedHost(wh_dict['weight'],
-                        host_state=host_manager.HostState(host, 'compute'),
-                        blob=blob, zone=zone)
+        json_entry = decryptor(blob)
 
-        except M2Crypto.EVP.EVPError:
-            raise InvalidBlob()
+        # Extract our WeightedHost values
+        wh_dict = json.loads(json_entry)
+        host = wh_dict.get('host', None)
+        blob = wh_dict.get('blob', None)
+        zone = wh_dict.get('zone', None)
+        return least_cost.WeightedHost(wh_dict['weight'],
+                    host_state=host_manager.HostState(host, 'compute'),
+                    blob=blob, zone=zone)
 
     def _ask_child_zone_to_create_instance(self, context, weighted_host,
             request_spec, kwargs):