mirror of
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41 lines
1.6 KiB
Python
41 lines
1.6 KiB
Python
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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from cryptography.exceptions import (
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UnsupportedAlgorithm, _Reasons
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)
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from cryptography.hazmat.backends.interfaces import HMACBackend
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from cryptography.hazmat.primitives import constant_time
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from cryptography.hazmat.primitives.twofactor import InvalidToken
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from cryptography.hazmat.primitives.twofactor.hotp import HOTP
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from cryptography.hazmat.primitives.twofactor.utils import _generate_uri
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class TOTP(object):
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def __init__(self, key, length, algorithm, time_step, backend,
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enforce_key_length=True):
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if not isinstance(backend, HMACBackend):
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raise UnsupportedAlgorithm(
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"Backend object does not implement HMACBackend.",
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_Reasons.BACKEND_MISSING_INTERFACE
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)
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self._time_step = time_step
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self._hotp = HOTP(key, length, algorithm, backend, enforce_key_length)
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def generate(self, time):
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counter = int(time / self._time_step)
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return self._hotp.generate(counter)
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def verify(self, totp, time):
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if not constant_time.bytes_eq(self.generate(time), totp):
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raise InvalidToken("Supplied TOTP value does not match.")
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def get_provisioning_uri(self, account_name, issuer):
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return _generate_uri(self._hotp, "totp", account_name, issuer, [
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("period", int(self._time_step)),
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])
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