Merge pull request #157 from reaperhulk/hmac

HMAC support

1 files changed, 57 insertions, 0 deletions

diff --git a/tests/hazmat/primitives/test_hmac.py b/tests/hazmat/primitives/test_hmac.py
new file mode 100644
index 00000000..42726a7c
--- /dev/null
+++ b/tests/hazmat/primitives/test_hmac.py
@@ -0,0 +1,57 @@
+# 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 pretend
+
+import pytest
+
+import six
+
+from cryptography.hazmat.primitives import hashes, hmac
+
+from .utils import generate_base_hmac_test
+
+
+class TestHMAC(object):
+    test_copy = generate_base_hmac_test(
+        hashes.MD5,
+        only_if=lambda backend: backend.hashes.supported(hashes.MD5),
+        skip_message="Does not support MD5",
+    )
+
+    def test_hmac_reject_unicode(self, backend):
+        h = hmac.HMAC(key=b"mykey", digestmod=hashes.SHA1, backend=backend)
+        with pytest.raises(TypeError):
+            h.update(six.u("\u00FC"))
+
+    def test_base_hash_hexdigest_string_type(self, backend):
+        h = hmac.HMAC(key=b"mykey", digestmod=hashes.SHA1, backend=backend,
+                      msg=b"")
+        assert isinstance(h.hexdigest(), str)
+
+    def test_hmac_no_digestmod(self):
+        with pytest.raises(TypeError):
+            hmac.HMAC(key=b"shortkey")
+
+
+class TestCopyHMAC(object):
+    def test_copy_backend_object(self):
+        pretend_hmac = pretend.stub(copy_ctx=lambda a: True)
+        pretend_backend = pretend.stub(hmacs=pretend_hmac)
+        pretend_ctx = pretend.stub()
+        h = hmac.HMAC(b"key", digestmod=hashes.SHA1, backend=pretend_backend,
+                      ctx=pretend_ctx)
+        assert h._backend is pretend_backend
+        assert h.copy()._backend is pretend_backend