Merge pull request #188 from dstufft/hazmat

Create a Hazardous Materials Area

1 files changed, 86 insertions, 0 deletions

diff --git a/tests/hazmat/primitives/test_block.py b/tests/hazmat/primitives/test_block.py
new file mode 100644
index 00000000..e0ed6697
--- /dev/null
+++ b/tests/hazmat/primitives/test_block.py
@@ -0,0 +1,86 @@
+# 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 binascii
+
+import pytest
+
+from cryptography.hazmat.primitives import interfaces
+from cryptography.hazmat.primitives.block import BlockCipher, ciphers, modes
+
+
+class TestBlockCipher(object):
+    def test_instantiate_without_backend(self):
+        BlockCipher(
+            ciphers.AES(binascii.unhexlify(b"0" * 32)),
+            modes.CBC(binascii.unhexlify(b"0" * 32))
+        )
+
+    def test_creates_encryptor(self):
+        cipher = BlockCipher(
+            ciphers.AES(binascii.unhexlify(b"0" * 32)),
+            modes.CBC(binascii.unhexlify(b"0" * 32))
+        )
+        assert isinstance(cipher.encryptor(), interfaces.CipherContext)
+
+    def test_creates_decryptor(self):
+        cipher = BlockCipher(
+            ciphers.AES(binascii.unhexlify(b"0" * 32)),
+            modes.CBC(binascii.unhexlify(b"0" * 32))
+        )
+        assert isinstance(cipher.decryptor(), interfaces.CipherContext)
+
+
+class TestBlockCipherContext(object):
+    def test_use_after_finalize(self, backend):
+        cipher = BlockCipher(
+            ciphers.AES(binascii.unhexlify(b"0" * 32)),
+            modes.CBC(binascii.unhexlify(b"0" * 32)),
+            backend
+        )
+        encryptor = cipher.encryptor()
+        encryptor.update(b"a" * 16)
+        encryptor.finalize()
+        with pytest.raises(ValueError):
+            encryptor.update(b"b" * 16)
+        with pytest.raises(ValueError):
+            encryptor.finalize()
+        decryptor = cipher.decryptor()
+        decryptor.update(b"a" * 16)
+        decryptor.finalize()
+        with pytest.raises(ValueError):
+            decryptor.update(b"b" * 16)
+        with pytest.raises(ValueError):
+            decryptor.finalize()
+
+    def test_unaligned_block_encryption(self, backend):
+        cipher = BlockCipher(
+            ciphers.AES(binascii.unhexlify(b"0" * 32)),
+            modes.ECB(),
+            backend
+        )
+        encryptor = cipher.encryptor()
+        ct = encryptor.update(b"a" * 15)
+        assert ct == b""
+        ct += encryptor.update(b"a" * 65)
+        assert len(ct) == 80
+        ct += encryptor.finalize()
+        decryptor = cipher.decryptor()
+        pt = decryptor.update(ct[:3])
+        assert pt == b""
+        pt += decryptor.update(ct[3:])
+        assert len(pt) == 80
+        assert pt == b"a" * 80
+        decryptor.finalize()