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# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import pytest
from cryptography.exceptions import _Reasons
from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.twofactor import InvalidToken
from cryptography.hazmat.primitives.twofactor.totp import TOTP
from ....utils import (
load_nist_vectors, load_vectors_from_file, raises_unsupported_algorithm
)
vectors = load_vectors_from_file(
"twofactor/rfc-6238.txt", load_nist_vectors)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
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"
def test_get_provisioning_uri(self, backend):
secret = b"12345678901234567890"
totp = TOTP(secret, 6, hashes.SHA1(), 30, backend=backend)
assert totp.get_provisioning_uri("Alice Smith", None) == (
"otpauth://totp/Alice%20Smith?digits=6&secret=GEZDGNBVG"
"Y3TQOJQGEZDGNBVGY3TQOJQ&algorithm=SHA1&period=30")
assert totp.get_provisioning_uri("Alice Smith", 'World') == (
"otpauth://totp/World:Alice%20Smith?digits=6&secret=GEZ"
"DGNBVGY3TQOJQGEZDGNBVGY3TQOJQ&algorithm=SHA1&issuer=World"
"&period=30")
def test_buffer_protocol(self, backend):
key = bytearray(b"a long key with lots of entropy goes here")
totp = TOTP(key, 8, hashes.SHA512(), 30, backend)
time = 60
assert totp.generate(time) == b"53049576"
def test_invalid_backend():
secret = b"12345678901234567890"
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
TOTP(secret, 8, hashes.SHA1(), 30, pretend_backend)
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