Beginnings of a constant_time module.

1 files changed, 41 insertions, 0 deletions

diff --git a/tests/hazmat/primitives/test_constant_time.py b/tests/hazmat/primitives/test_constant_time.py
new file mode 100644
index 00000000..dd910dee
--- /dev/null
+++ b/tests/hazmat/primitives/test_constant_time.py
@@ -0,0 +1,41 @@
+# 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 pytest
+
+import six
+
+from cryptography.hazmat.primitives import constant_time
+
+
+class TestConstantTimeBytesEq(object):
+    def test_reject_unicode(self):
+        with pytest.raises(TypeError):
+            constant_time.bytes_eq(b"foo", six.u("foo"))
+
+        with pytest.raises(TypeError):
+            constant_time.bytes_eq(six.u("foo"), b"foo")
+
+        with pytest.raises(TypeError):
+            constant_time.bytes_eq(six.u("foo"), six.u("foo"))
+
+    def test_compares(self):
+        assert constant_time.bytes_eq(b"foo", b"foo") is True
+
+        assert constant_time.bytes_eq(b"foo", b"bar") is False
+
+        assert constant_time.bytes_eq(b"foobar", b"foo") is False
+
+        assert constant_time.bytes_eq(b"foo", b"foobar") is False