42 "ˆl–Ãa¾”ªeJu@·pÜlJbÑ¿Á ƒ™oÀ¿»# 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 absolute_import, division, print_function from cryptography import utils from cryptography.exceptions import ( AlreadyFinalized, UnsupportedAlgorithm, _Reasons ) from cryptography.hazmat.backends.interfaces import CMACBackend from cryptography.hazmat.primitives import ciphers, interfaces @utils.register_interface(interfaces.MACContext) class CMAC(object): def __init__(self, algorithm, backend, ctx=None): if not isinstance(backend, CMACBackend): raise UnsupportedAlgorithm( "Backend object does not implement CMACBackend.", _Reasons.BACKEND_MISSING_INTERFACE ) if not isinstance(algorithm, ciphers.BlockCipherAlgorithm): raise TypeError( "Expected instance of BlockCipherAlgorithm." ) self._algorithm = algorithm self._backend = backend if ctx is None: self._ctx = self._backend.create_cmac_ctx(self._algorithm) else: self._ctx = ctx def update(self, data): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") if not isinstance(data, bytes): raise TypeError("data must be bytes.") self._ctx.update(data) def finalize(self): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") digest = self._ctx.finalize() self._ctx = None return digest def verify(self, signature): if not isinstance(signature, bytes): raise TypeError("signature must be bytes.") if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") ctx, self._ctx = self._ctx, None ctx.verify(signature) def copy(self): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") return CMAC( self._algorithm, backend=self._backend, ctx=self._ctx.copy() ) ˆl–ß=¿Jå2ÛR‚œP¸\JbÑ¿Â 0ÁÀ 355_•I|¥‰ÓMjqØ‚¦ ë<óo¬ÂÁc 404 Not Found

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