Added CMAC tests
diff --git a/pytest.ini b/pytest.ini
index b590d0b..cb6a80a 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -2,6 +2,7 @@
addopts = -r s
markers =
cipher: this test requires a backend providing CipherBackend
+ cmac: this test requires a backend providing CMACBackend
dsa: this test requires a backend providing DSABackend
hash: this test requires a backend providing HashBackend
hmac: this test requires a backend providing HMACBackend
diff --git a/tests/conftest.py b/tests/conftest.py
index 1ee2a99..6ba8ae0 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -17,10 +17,9 @@
from cryptography.hazmat.backends import _available_backends
from cryptography.hazmat.backends.interfaces import (
- CipherBackend, DSABackend, HMACBackend, HashBackend, PBKDF2HMACBackend,
- RSABackend
+ CipherBackend, CMACBackend, DSABackend, HMACBackend, HashBackend,
+ PBKDF2HMACBackend, RSABackend
)
-
from .utils import check_backend_support, check_for_iface, select_backends
@@ -36,6 +35,7 @@
def pytest_runtest_setup(item):
check_for_iface("hmac", HMACBackend, item)
check_for_iface("cipher", CipherBackend, item)
+ check_for_iface("cmac", CMACBackend, item)
check_for_iface("hash", HashBackend, item)
check_for_iface("pbkdf2hmac", PBKDF2HMACBackend, item)
check_for_iface("dsa", DSABackend, item)
diff --git a/tests/hazmat/primitives/test_cmac.py b/tests/hazmat/primitives/test_cmac.py
new file mode 100644
index 0000000..d61ce5a
--- /dev/null
+++ b/tests/hazmat/primitives/test_cmac.py
@@ -0,0 +1,172 @@
+# 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 pretend
+
+import pytest
+
+import six
+
+from cryptography import utils
+from cryptography.exceptions import (
+ AlreadyFinalized, InvalidSignature, _Reasons
+)
+from cryptography.hazmat.backends.interfaces import CMACBackend
+from cryptography.hazmat.primitives.ciphers.algorithms import (
+ AES, ARC4, TripleDES
+)
+from cryptography.hazmat.primitives.cmac import CMAC
+
+from tests.utils import (
+ load_vectors_from_file, load_nist_vectors, raises_unsupported_algorithm
+)
+
+vectors_aes128 = load_vectors_from_file(
+ "CMAC/nist-800-38b-aes128.txt", load_nist_vectors)
+
+vectors_aes192 = load_vectors_from_file(
+ "CMAC/nist-800-38b-aes192.txt", load_nist_vectors)
+
+vectors_aes256 = load_vectors_from_file(
+ "CMAC/nist-800-38b-aes256.txt", load_nist_vectors)
+
+vectors_aes = vectors_aes128 + vectors_aes192 + vectors_aes256
+
+vectors_3des = load_vectors_from_file(
+ "CMAC/nist-800-38b-3des.txt", load_nist_vectors)
+
+
+@pytest.mark.supported(
+ only_if=lambda backend: backend.cmac_supported(),
+ skip_message="Does not support CMAC."
+)
+@pytest.mark.cmac
+class TestCMAC(object):
+ @pytest.mark.parametrize("params", vectors_aes)
+ def test_aes_generate(self, backend, params):
+ key = params["key"]
+ message = params["message"]
+ output = params["output"]
+
+ cmac = CMAC(AES(binascii.unhexlify(key)), backend)
+ cmac.update(binascii.unhexlify(message))
+ assert binascii.hexlify(cmac.finalize()) == output
+
+ @pytest.mark.parametrize("params", vectors_aes)
+ def test_aes_verify(self, backend, params):
+ key = params["key"]
+ message = params["message"]
+ output = params["output"]
+
+ cmac = CMAC(AES(binascii.unhexlify(key)), backend)
+ cmac.update(binascii.unhexlify(message))
+ assert cmac.verify(binascii.unhexlify(output)) is None
+
+ @pytest.mark.parametrize("params", vectors_3des)
+ def test_3des_generate(self, backend, params):
+ key1 = params["key1"]
+ key2 = params["key2"]
+ key3 = params["key3"]
+
+ if key1 == key3:
+ key = key1 + key2
+ else:
+ key = key1 + key2 + key3
+
+ message = params["message"]
+ output = params["output"]
+
+ cmac = CMAC(TripleDES(binascii.unhexlify(key)), backend)
+ cmac.update(binascii.unhexlify(message))
+ assert binascii.hexlify(cmac.finalize()) == output
+
+ @pytest.mark.parametrize("params", vectors_3des)
+ def test_3des_verify(self, backend, params):
+ key1 = params["key1"]
+ key2 = params["key2"]
+ key3 = params["key3"]
+
+ if key1 == key3:
+ key = key1 + key2
+ else:
+ key = key1 + key2 + key3
+
+ message = params["message"]
+ output = params["output"]
+
+ cmac = CMAC(TripleDES(binascii.unhexlify(key)), backend)
+ cmac.update(binascii.unhexlify(message))
+ assert cmac.verify(binascii.unhexlify(output)) is None
+
+ def test_invalid_verify(self, backend):
+ key = b"2b7e151628aed2a6abf7158809cf4f3c"
+ cmac = CMAC(AES(key), backend)
+ cmac.update(b"6bc1bee22e409f96e93d7e117393172a")
+
+ with pytest.raises(InvalidSignature):
+ cmac.verify(b"foobar")
+
+ def test_invalid_algorithm(self, backend):
+ key = b"0102030405"
+ with pytest.raises(TypeError):
+ CMAC(ARC4(key), backend)
+
+ def test_raises_after_finalize(self, backend):
+ key = b"2b7e151628aed2a6abf7158809cf4f3c"
+ cmac = CMAC(AES(key), backend)
+ cmac.finalize()
+
+ with pytest.raises(AlreadyFinalized):
+ cmac.update(b"foo")
+
+ with pytest.raises(AlreadyFinalized):
+ cmac.copy()
+
+ with pytest.raises(AlreadyFinalized):
+ cmac.finalize()
+
+ def test_verify_reject_unicode(self, backend):
+ key = b"2b7e151628aed2a6abf7158809cf4f3c"
+ cmac = CMAC(AES(key), backend)
+
+ with pytest.raises(TypeError):
+ cmac.update(six.u(''))
+
+ with pytest.raises(TypeError):
+ cmac.verify(six.u(''))
+
+ def test_copy(self, backend):
+ @utils.register_interface(CMACBackend)
+ class PretendBackend(object):
+ pass
+
+ pretend_backend = PretendBackend()
+ copied_ctx = pretend.stub()
+ pretend_ctx = pretend.stub(copy=lambda: copied_ctx)
+ key = b"2b7e151628aed2a6abf7158809cf4f3c"
+ cmac = CMAC(AES(key), backend=pretend_backend, ctx=pretend_ctx)
+
+ assert cmac._backend is pretend_backend
+ assert cmac.copy()._backend is pretend_backend
+
+
+def test_invalid_backend():
+ key = b"2b7e151628aed2a6abf7158809cf4f3c"
+ pretend_backend = object()
+
+ with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
+ CMAC(AES(key), pretend_backend)