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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.
from __future__ import absolute_import, division, print_function
import os
import pytest
from cryptography.exceptions import InvalidToken, _Reasons
from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.hashes import MD5, SHA1
from cryptography.hazmat.primitives.twofactor.hotp import HOTP
from ....utils import (
load_nist_vectors, load_vectors_from_file, raises_unsupported_algorithm
)
vectors = load_vectors_from_file(
"twofactor/rfc-4226.txt", load_nist_vectors)
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.SHA1()),
skip_message="Does not support HMAC-SHA1."
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHOTP(object):
def test_invalid_key_length(self, backend):
secret = os.urandom(10)
with pytest.raises(ValueError):
HOTP(secret, 6, SHA1(), backend)
def test_invalid_hotp_length(self, backend):
secret = os.urandom(16)
with pytest.raises(ValueError):
HOTP(secret, 4, SHA1(), backend)
def test_invalid_algorithm(self, backend):
secret = os.urandom(16)
with pytest.raises(TypeError):
HOTP(secret, 6, MD5(), backend)
@pytest.mark.parametrize("params", vectors)
def test_truncate(self, backend, params):
secret = params["secret"]
counter = int(params["counter"])
truncated = params["truncated"]
hotp = HOTP(secret, 6, SHA1(), backend)
assert hotp._dynamic_truncate(counter) == int(truncated.decode(), 16)
@pytest.mark.parametrize("params", vectors)
def test_generate(self, backend, params):
secret = params["secret"]
counter = int(params["counter"])
hotp_value = params["hotp"]
hotp = HOTP(secret, 6, SHA1(), backend)
assert hotp.generate(counter) == hotp_value
@pytest.mark.parametrize("params", vectors)
def test_verify(self, backend, params):
secret = params["secret"]
counter = int(params["counter"])
hotp_value = params["hotp"]
hotp = HOTP(secret, 6, SHA1(), backend)
assert hotp.verify(hotp_value, counter) is None
def test_invalid_verify(self, backend):
secret = b"12345678901234567890"
counter = 0
hotp = HOTP(secret, 6, SHA1(), backend)
with pytest.raises(InvalidToken):
hotp.verify(b"123456", counter)
def test_length_not_int(self, backend):
secret = b"12345678901234567890"
with pytest.raises(TypeError):
HOTP(secret, b"foo", SHA1(), backend)
def test_invalid_backend():
secret = b"12345678901234567890"
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
HOTP(secret, 8, hashes.SHA1(), pretend_backend)
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