1 files changed, 0 insertions, 30 deletions
diff --git a/synapse/storage/data_stores/main/signatures.py b/synapse/storage/data_stores/main/signatures.py
index 563216b63c..36244d9f5d 100644
--- a/synapse/storage/data_stores/main/signatures.py
+++ b/synapse/storage/data_stores/main/signatures.py
@@ -13,23 +13,13 @@
 # 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.storage._base import SQLBaseStore
 from synapse.util.caches.descriptors import cached, cachedList
 
-# 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()
@@ -79,23 +69,3 @@ class SignatureWorkerStore(SQLBaseStore):
 
 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.db.simple_insert_many_txn(txn, table="event_reference_hashes", values=vals)