opt
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imunify360
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venv
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lib
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python3.11
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site-packages
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cryptography
/
hazmat
/
primitives
/
twofactor
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totp.py
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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 annotations import typing from cryptography.hazmat.primitives import constant_time from cryptography.hazmat.primitives.twofactor import InvalidToken from cryptography.hazmat.primitives.twofactor.hotp import ( HOTP, HOTPHashTypes, _generate_uri, ) class TOTP: def __init__( self, key: bytes, length: int, algorithm: HOTPHashTypes, time_step: int, backend: typing.Any = None, enforce_key_length: bool = True, ): self._time_step = time_step self._hotp = HOTP( key, length, algorithm, enforce_key_length=enforce_key_length ) def generate(self, time: int | float) -> bytes: counter = int(time / self._time_step) return self._hotp.generate(counter) def verify(self, totp: bytes, time: int) -> None: if not constant_time.bytes_eq(self.generate(time), totp): raise InvalidToken("Supplied TOTP value does not match.") def get_provisioning_uri( self, account_name: str, issuer: str | None ) -> str: return _generate_uri( self._hotp, "totp", account_name, issuer, [("period", int(self._time_step))], )
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