diff --git a/synapse/storage/signatures.py b/synapse/storage/signatures.py
deleted file mode 100644
index fb83218f90..0000000000
--- a/synapse/storage/signatures.py
+++ /dev/null
@@ -1,102 +0,0 @@
-# -*- coding: utf-8 -*-
-# Copyright 2014-2016 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 six
-
-from unpaddedbase64 import encode_base64
-
-from twisted.internet import defer
-
-from synapse.crypto.event_signing import compute_event_reference_hash
-from synapse.util.caches.descriptors import cached, cachedList
-
-from ._base import SQLBaseStore
-
-# py2 sqlite has buffer hardcoded as only binary type, so we must use it,
-# despite being deprecated and removed in favor of memoryview
-if six.PY2:
- db_binary_type = six.moves.builtins.buffer
-else:
- db_binary_type = memoryview
-
-
-class SignatureWorkerStore(SQLBaseStore):
- @cached()
- def get_event_reference_hash(self, event_id):
- # This is a dummy function to allow get_event_reference_hashes
- # to use its cache
- raise NotImplementedError()
-
- @cachedList(
- cached_method_name="get_event_reference_hash", list_name="event_ids", num_args=1
- )
- def get_event_reference_hashes(self, event_ids):
- def f(txn):
- return {
- event_id: self._get_event_reference_hashes_txn(txn, event_id)
- for event_id in event_ids
- }
-
- return self.runInteraction("get_event_reference_hashes", f)
-
- @defer.inlineCallbacks
- def add_event_hashes(self, event_ids):
- hashes = yield self.get_event_reference_hashes(event_ids)
- hashes = {
- e_id: {k: encode_base64(v) for k, v in h.items() if k == "sha256"}
- for e_id, h in hashes.items()
- }
-
- return list(hashes.items())
-
- def _get_event_reference_hashes_txn(self, txn, event_id):
- """Get all the hashes for a given PDU.
- Args:
- txn (cursor):
- event_id (str): Id for the Event.
- Returns:
- A dict[unicode, bytes] of algorithm -> hash.
- """
- query = (
- "SELECT algorithm, hash"
- " FROM event_reference_hashes"
- " WHERE event_id = ?"
- )
- txn.execute(query, (event_id,))
- return {k: v for k, v in txn}
-
-
-class SignatureStore(SignatureWorkerStore):
- """Persistence for event signatures and hashes"""
-
- def _store_event_reference_hashes_txn(self, txn, events):
- """Store a hash for a PDU
- Args:
- txn (cursor):
- events (list): list of Events.
- """
-
- vals = []
- for event in events:
- ref_alg, ref_hash_bytes = compute_event_reference_hash(event)
- vals.append(
- {
- "event_id": event.event_id,
- "algorithm": ref_alg,
- "hash": db_binary_type(ref_hash_bytes),
- }
- )
-
- self._simple_insert_many_txn(txn, table="event_reference_hashes", values=vals)
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