Ciphers should know what size their keys are

1 files changed, 29 insertions, 0 deletions

diff --git a/tests/primitives/test_ciphers.py b/tests/primitives/test_ciphers.py
new file mode 100644
index 00000000..31b4275e
--- /dev/null
+++ b/tests/primitives/test_ciphers.py
@@ -0,0 +1,29 @@
+# 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 binascii
+
+import pytest
+
+from cryptography.primitives.block.ciphers import AES
+
+
+class TestAES(object):
+    @pytest.mark.parametrize(("key", "keysize"), [
+        (b"0" * 32, 128),
+        (b"0" * 48, 192),
+        (b"0" * 64, 256),
+    ])
+    def test_key_size(self, key, keysize):
+        cipher = AES(binascii.unhexlify(key))
+        assert cipher.key_size == keysize