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# 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.
import pytest
from cryptography.exceptions import InvalidToken
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.hashes import SHA1
from cryptography.hazmat.primitives.twofactor.totp import TOTP
from tests.utils import load_vectors_from_file, load_nist_vectors
vectors = load_vectors_from_file(
"twofactor/rfc-6238.txt", load_nist_vectors)
@pytest.mark.hmac
class TestTOTP(object):
@pytest.mark.parametrize("params", vectors)
def test_generate(self, backend, params):
secret = params["secret"]
time = int(params["time"])
mode = params["mode"]
totp_value = params["totp"]
algorithm = getattr(hashes, mode.decode())
totp = TOTP(secret, 8, algorithm(), 30, backend)
assert totp.generate(time) == totp_value
@pytest.mark.parametrize("params", vectors)
def test_verify(self, backend, params):
secret = params["secret"]
time = int(params["time"])
mode = params["mode"]
totp_value = params["totp"]
algorithm = getattr(hashes, mode.decode())
totp = TOTP(secret, 8, algorithm(), 30, backend)
assert totp.verify(totp_value, time) is None
def test_invalid_verify(self, backend):
secret = b"12345678901234567890"
time = 59
totp = TOTP(secret, 8, SHA1(), 30, backend)
with pytest.raises(InvalidToken):
totp.verify(b"12345678", time)
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