1 files changed, 65 insertions, 0 deletions
diff --git a/tests/hazmat/backends/test_commoncrypto.py b/tests/hazmat/backends/test_commoncrypto.py
new file mode 100644
index 00000000..7cc0f72f
--- /dev/null
+++ b/tests/hazmat/backends/test_commoncrypto.py
@@ -0,0 +1,65 @@
+# 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 pytest
+
+from cryptography import utils
+from cryptography.exceptions import UnsupportedAlgorithm, InternalError
+from cryptography.hazmat.bindings.commoncrypto.binding import Binding
+from cryptography.hazmat.primitives import interfaces
+from cryptography.hazmat.primitives.ciphers.algorithms import AES
+from cryptography.hazmat.primitives.ciphers.base import Cipher
+from cryptography.hazmat.primitives.ciphers.modes import CBC, GCM
+
+
+@utils.register_interface(interfaces.CipherAlgorithm)
+class DummyCipher(object):
+    name = "dummy-cipher"
+    block_size = 128
+
+
+@pytest.mark.skipif(not Binding.is_available(),
+                    reason="CommonCrypto not available")
+class TestCommonCrypto(object):
+    def test_supports_cipher(self):
+        from cryptography.hazmat.backends.commoncrypto.backend import backend
+        assert backend.cipher_supported(None, None) is False
+
+    def test_register_duplicate_cipher_adapter(self):
+        from cryptography.hazmat.backends.commoncrypto.backend import backend
+        with pytest.raises(ValueError):
+            backend._register_cipher_adapter(
+                AES, backend._lib.kCCAlgorithmAES128,
+                CBC, backend._lib.kCCModeCBC
+            )
+
+    def test_handle_response(self):
+        from cryptography.hazmat.backends.commoncrypto.backend import backend
+
+        with pytest.raises(ValueError):
+            backend._check_response(backend._lib.kCCAlignmentError)
+
+        with pytest.raises(InternalError):
+            backend._check_response(backend._lib.kCCMemoryFailure)
+
+        with pytest.raises(InternalError):
+            backend._check_response(backend._lib.kCCDecodeError)
+
+    def test_nonexistent_aead_cipher(self):
+        from cryptography.hazmat.backends.commoncrypto.backend import Backend
+        b = Backend()
+        cipher = Cipher(
+            DummyCipher(), GCM(b"fake_iv_here"), backend=b,
+        )
+        with pytest.raises(UnsupportedAlgorithm):
+            cipher.encryptor()