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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.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.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA1()),
skip_message="Does not support HMAC-SHA1."
)
@pytest.mark.parametrize(
"params", [i for i in vectors if i["mode"] == b"SHA1"])
def test_generate_sha1(self, backend, params):
secret = params["secret"]
time = int(params["time"])
totp_value = params["totp"]
totp = TOTP(secret, 8, hashes.SHA1(), 30, backend)
assert totp.generate(time) == totp_value
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA256()),
skip_message="Does not support HMAC-SHA256."
)
@pytest.mark.parametrize(
"params", [i for i in vectors if i["mode"] == b"SHA256"])
def test_generate_sha256(self, backend, params):
secret = params["secret"]
time = int(params["time"])
totp_value = params["totp"]
totp = TOTP(secret, 8, hashes.SHA256(), 30, backend)
assert totp.generate(time) == totp_value
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA512()),
skip_message="Does not support HMAC-SHA512."
)
@pytest.mark.parametrize(
"params", [i for i in vectors if i["mode"] == b"SHA512"])
def test_generate_sha512(self, backend, params):
secret = params["secret"]
time = int(params["time"])
totp_value = params["totp"]
totp = TOTP(secret, 8, hashes.SHA512(), 30, backend)
assert totp.generate(time) == totp_value
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA1()),
skip_message="Does not support HMAC-SHA1."
)
@pytest.mark.parametrize(
"params", [i for i in vectors if i["mode"] == b"SHA1"])
def test_verify_sha1(self, backend, params):
secret = params["secret"]
time = int(params["time"])
totp_value = params["totp"]
totp = TOTP(secret, 8, hashes.SHA1(), 30, backend)
assert totp.verify(totp_value, time) is None
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA256()),
skip_message="Does not support HMAC-SHA256."
)
@pytest.mark.parametrize(
"params", [i for i in vectors if i["mode"] == b"SHA256"])
def test_verify_sha256(self, backend, params):
secret = params["secret"]
time = int(params["time"])
totp_value = params["totp"]
totp = TOTP(secret, 8, hashes.SHA256(), 30, backend)
assert totp.verify(totp_value, time) is None
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA512()),
skip_message="Does not support HMAC-SHA512."
)
@pytest.mark.parametrize(
"params", [i for i in vectors if i["mode"] == b"SHA512"])
def test_verify_sha512(self, backend, params):
secret = params["secret"]
time = int(params["time"])
totp_value = params["totp"]
totp = TOTP(secret, 8, hashes.SHA512(), 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, hashes.SHA1(), 30, backend)
with pytest.raises(InvalidToken):
totp.verify(b"12345678", time)
def test_floating_point_time_generate(self, backend):
secret = b"12345678901234567890"
time = 59.1
totp = TOTP(secret, 8, hashes.SHA1(), 30, backend)
assert totp.generate(time) == b"94287082"
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