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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
asymmetric	[ DIR ]	drwxr-xr-x
ciphers	[ DIR ]	drwxr-xr-x
kdf	[ DIR ]	drwxr-xr-x
serialization	[ DIR ]	drwxr-xr-x
twofactor	[ DIR ]	drwxr-xr-x
__init__.py	180 B	-rw-r--r--
_asymmetric.py	532 B	-rw-r--r--
_cipheralgorithm.py	1.07 KB	-rw-r--r--
_serialization.py	5.09 KB	-rw-r--r--
cmac.py	2.02 KB	-rw-r--r--
constant_time.py	422 B	-rw-r--r--
hashes.py	5 KB	-rw-r--r--
hmac.py	423 B	-rw-r--r--
keywrap.py	5.54 KB	-rw-r--r--
padding.py	6.1 KB	-rw-r--r--
poly1305.py	355 B	-rw-r--r--

Code Editor : 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())

${this.title}

Code Editor : cmac.py