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# Copyright 2016-2018 Yubico AB
#
# 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 yubihsm.defs import ALGORITHM, CAPABILITY
from yubihsm.objects import SymmetricKey
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from typing import Optional
import os
import pytest
AES_ALGORITHMS = (ALGORITHM.AES128, ALGORITHM.AES192, ALGORITHM.AES256)
AES_CAPABILITIES = (
CAPABILITY.ENCRYPT_ECB
| CAPABILITY.DECRYPT_ECB
| CAPABILITY.ENCRYPT_CBC
| CAPABILITY.DECRYPT_CBC
)
@pytest.fixture(autouse=True, scope="module")
def prerequisites(info):
if info.version < (2, 3, 0):
pytest.skip("Symmetric keys require YubiHSM 2.3.0")
@pytest.fixture(scope="module", params=AES_ALGORITHMS)
def generated_key(session, request):
algorithm = request.param
key = SymmetricKey.generate(
session,
0,
"Generated AES Key %x" % algorithm,
0xFFFF,
AES_CAPABILITIES,
algorithm,
)
yield key
key.delete()
@pytest.fixture(scope="module", params=AES_ALGORITHMS)
def imported_key(session, request):
algorithm = request.param
key_to_import = os.urandom(algorithm.to_key_size())
key = SymmetricKey.put(
session,
0,
"Imported AES Key %x" % algorithm,
0xFFFF,
AES_CAPABILITIES,
algorithm,
key_to_import,
)
yield key, key_to_import
key.delete()
def test_import_invalid_key_size(session):
# Key length must match algorithm
with pytest.raises(ValueError):
SymmetricKey.put(
session,
0,
"Test PUT invalid key length",
0xFFFF,
AES_CAPABILITIES,
ALGORITHM.AES128,
os.urandom(24),
)
def test_import_invalid_algorithm(session):
# Algorithm must be AES128, AES192 or AES256
with pytest.raises(ValueError):
SymmetricKey.put(
session,
0,
"Test PUT invalid algorithm",
0xFFFF,
AES_CAPABILITIES,
ALGORITHM.AES128_CCM_WRAP,
os.urandom(16),
)
class TestSymmetricECB:
def validate_ecb(
self, pt: bytes, keyobj: SymmetricKey, key: Optional[bytes] = None
):
ct = keyobj.encrypt_ecb(pt)
if key:
encryptor = Cipher(algorithms.AES(key), modes.ECB()).encryptor()
assert ct == encryptor.update(pt) + encryptor.finalize()
assert pt == keyobj.decrypt_ecb(ct)
def test_ecb_generated_key(self, generated_key):
pt = os.urandom(256)
self.validate_ecb(pt, generated_key)
def test_ecb_imported_key(self, imported_key):
pt = os.urandom(256)
self.validate_ecb(pt, *imported_key)
def test_ecb_large_pt_generated_key(self, generated_key):
pt = os.urandom(4096)
self.validate_ecb(pt, generated_key)
def test_ecb_large_pt_imported_key(self, imported_key):
pt = os.urandom(4096)
self.validate_ecb(pt, *imported_key)
class TestSymmetricCBC:
def validate_cbc(
self, pt: bytes, keyobj: SymmetricKey, key: Optional[bytes] = None
):
iv = os.urandom(16)
ct = keyobj.encrypt_cbc(iv, pt)
if key:
encryptor = Cipher(algorithms.AES(key), modes.CBC(iv)).encryptor()
assert ct == encryptor.update(pt) + encryptor.finalize()
assert pt == keyobj.decrypt_cbc(iv, ct)
def test_cbc_generated_key(self, generated_key):
pt = os.urandom(256)
self.validate_cbc(pt, generated_key)
def test_cbc_imported_key(self, imported_key):
pt = os.urandom(256)
self.validate_cbc(pt, *imported_key)
def test_cbc_large_pt_generated_key(self, generated_key):
pt = os.urandom(4096)
self.validate_cbc(pt, generated_key)
def test_cbc_large_pt_imported_key(self, imported_key):
pt = os.urandom(4096)
self.validate_cbc(pt, *imported_key)
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