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✏️ at/primitives/cmac.py

# 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 import utils
from cryptography.exceptions import AlreadyFinalized
from cryptography.hazmat.primitives import ciphers

if typing.TYPE_CHECKING:
    from cryptography.hazmat.backends.openssl.cmac import _CMACContext

class CMAC:
    _ctx: typing.Optional[_CMACContext]
    _algorithm: ciphers.BlockCipherAlgorithm

def __init__(
        self,
        algorithm: ciphers.BlockCipherAlgorithm,
        backend: typing.Any = None,
        ctx: typing.Optional[_CMACContext] = None,
    ) -> None:
        if not isinstance(algorithm, ciphers.BlockCipherAlgorithm):
            raise TypeError("Expected instance of BlockCipherAlgorithm.")
        self._algorithm = algorithm

if ctx is None:
            from cryptography.hazmat.backends.openssl.backend import (
                backend as ossl,
            )

self._ctx = ossl.create_cmac_ctx(self._algorithm)
        else:
            self._ctx = ctx

def update(self, data: bytes) -> None:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")

utils._check_bytes("data", data)
        self._ctx.update(data)

def finalize(self) -> bytes:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        digest = self._ctx.finalize()
        self._ctx = None
        return digest

def verify(self, signature: bytes) -> None:
        utils._check_bytes("signature", signature)
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")

ctx, self._ctx = self._ctx, None
        ctx.verify(signature)

def copy(self) -> CMAC:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        return CMAC(self._algorithm, ctx=self._ctx.copy())

Batal

⬅ hazmat 17 item

Nama	Tipe	Ukuran	Diubah	Aksi
📁__pycache__	dir	—	2026-03-11 18:53	📂 Buka
📁asymmetric	dir	—	2026-03-11 18:53	📂 Buka
📁ciphers	dir	—	2026-03-11 18:53	📂 Buka
📁kdf	dir	—	2026-03-11 18:53	📂 Buka
📁serialization	dir	—	2026-03-11 18:53	📂 Buka
📁twofactor	dir	—	2026-03-11 18:53	📂 Buka
🐍__init__.py	py	180 B	2026-01-20 12:58	✏️ 👁️
🐍_asymmetric.py	py	532 B	2026-01-20 12:58	✏️ 👁️
🐍_cipheralgorithm.py	py	1.1 KB	2026-01-20 12:58	✏️ 👁️
🐍_serialization.py	py	5.1 KB	2026-01-20 12:58	✏️ 👁️
🐍cmac.py	py	2 KB	2026-01-20 12:58	✏️ 👁️
🐍constant_time.py	py	422 B	2026-01-20 12:58	✏️ 👁️
🐍hashes.py	py	5 KB	2026-01-20 12:58	✏️ 👁️
🐍hmac.py	py	423 B	2026-01-20 12:58	✏️ 👁️
🐍keywrap.py	py	5.5 KB	2026-01-20 12:58	✏️ 👁️
🐍padding.py	py	6.1 KB	2026-01-20 12:58	✏️ 👁️
🐍poly1305.py	py	355 B	2026-01-20 12:58	✏️ 👁️

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