forked from STI/Astroport.ONE
51 lines
1.4 KiB
Python
51 lines
1.4 KiB
Python
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# 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 annotations
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import typing
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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 (
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HOTP,
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HOTPHashTypes,
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_generate_uri,
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)
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class TOTP:
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def __init__(
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self,
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key: bytes,
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length: int,
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algorithm: HOTPHashTypes,
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time_step: int,
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backend: typing.Any = None,
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enforce_key_length: bool = True,
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):
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self._time_step = time_step
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self._hotp = HOTP(
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key, length, algorithm, enforce_key_length=enforce_key_length
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)
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def generate(self, time: int | float) -> bytes:
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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: bytes, time: int) -> None:
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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(
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self, account_name: str, issuer: str | None
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) -> str:
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return _generate_uri(
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self._hotp,
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"totp",
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account_name,
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issuer,
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[("period", int(self._time_step))],
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)
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