1 files changed, 21 insertions, 0 deletions
diff --git a/cryptography/primitives/interfaces.py b/cryptography/primitives/interfaces.py
new file mode 100644
index 00000000..a2b091df
--- /dev/null
+++ b/cryptography/primitives/interfaces.py
@@ -0,0 +1,21 @@
+# 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.
+
+from __future__ import absolute_import, division, print_function
+
+import abc
+import six
+
+
+class ModeWithInitializationVector(six.with_metaclass(abc.ABCMeta)):
+    pass