diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
new file mode 100644
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+++ b/synapse/handlers/e2e_keys.py
@@ -0,0 +1,130 @@
+# -*- coding: utf-8 -*-
+# Copyright 2016 OpenMarket Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import collections
+import json
+import logging
+
+from twisted.internet import defer
+
+from synapse.api import errors
+import synapse.types
+
+logger = logging.getLogger(__name__)
+
+
+class E2eKeysHandler(object):
+ def __init__(self, hs):
+ self.store = hs.get_datastore()
+ self.federation = hs.get_replication_layer()
+ self.is_mine_id = hs.is_mine_id
+ self.server_name = hs.hostname
+
+ # doesn't really work as part of the generic query API, because the
+ # query request requires an object POST, but we abuse the
+ # "query handler" interface.
+ self.federation.register_query_handler(
+ "client_keys", self.on_federation_query_client_keys
+ )
+
+ @defer.inlineCallbacks
+ def query_devices(self, query_body):
+ """ Handle a device key query from a client
+
+ {
+ "device_keys": {
+ "<user_id>": ["<device_id>"]
+ }
+ }
+ ->
+ {
+ "device_keys": {
+ "<user_id>": {
+ "<device_id>": {
+ ...
+ }
+ }
+ }
+ }
+ """
+ device_keys_query = query_body.get("device_keys", {})
+
+ # separate users by domain.
+ # make a map from domain to user_id to device_ids
+ queries_by_domain = collections.defaultdict(dict)
+ for user_id, device_ids in device_keys_query.items():
+ user = synapse.types.UserID.from_string(user_id)
+ queries_by_domain[user.domain][user_id] = device_ids
+
+ # do the queries
+ # TODO: do these in parallel
+ results = {}
+ for destination, destination_query in queries_by_domain.items():
+ if destination == self.server_name:
+ res = yield self.query_local_devices(destination_query)
+ else:
+ res = yield self.federation.query_client_keys(
+ destination, {"device_keys": destination_query}
+ )
+ res = res["device_keys"]
+ for user_id, keys in res.items():
+ if user_id in destination_query:
+ results[user_id] = keys
+
+ defer.returnValue((200, {"device_keys": results}))
+
+ @defer.inlineCallbacks
+ def query_local_devices(self, query):
+ """Get E2E device keys for local users
+
+ Args:
+ query (dict[string, list[string]|None): map from user_id to a list
+ of devices to query (None for all devices)
+
+ Returns:
+ defer.Deferred: (resolves to dict[string, dict[string, dict]]):
+ map from user_id -> device_id -> device details
+ """
+ local_query = []
+
+ for user_id, device_ids in query.items():
+ if not self.is_mine_id(user_id):
+ logger.warning("Request for keys for non-local user %s",
+ user_id)
+ raise errors.SynapseError(400, "Not a user here")
+
+ if not device_ids:
+ local_query.append((user_id, None))
+ else:
+ for device_id in device_ids:
+ local_query.append((user_id, device_id))
+
+ results = yield self.store.get_e2e_device_keys(local_query)
+
+ # un-jsonify the results
+ json_result = collections.defaultdict(dict)
+ for user_id, device_keys in results.items():
+ for device_id, json_bytes in device_keys.items():
+ json_result[user_id][device_id] = json.loads(json_bytes)
+
+ defer.returnValue(json_result)
+
+ @defer.inlineCallbacks
+ def on_federation_query_client_keys(self, query_body):
+ """ Handle a device key query from a federated server
+ """
+ device_keys_query = query_body.get("device_keys", {})
+ res = yield self.query_local_devices(device_keys_query)
+ defer.returnValue({"device_keys": res})
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