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# laeJu@plJbѿ ? # 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 UnsupportedAlgorithm, _Reasons from cryptography.hazmat.backends.interfaces import ( CMACBackend, CipherBackend, DERSerializationBackend, DHBackend, DSABackend, EllipticCurveBackend, HMACBackend, HashBackend, PBKDF2HMACBackend, PEMSerializationBackend, RSABackend, ScryptBackend, X509Backend ) @utils.register_interface(CMACBackend) @utils.register_interface(CipherBackend) @utils.register_interface(DERSerializationBackend) @utils.register_interface(HashBackend) @utils.register_interface(HMACBackend) @utils.register_interface(PBKDF2HMACBackend) @utils.register_interface(RSABackend) @utils.register_interface(DSABackend) @utils.register_interface(EllipticCurveBackend) @utils.register_interface(PEMSerializationBackend) @utils.register_interface(X509Backend) @utils.register_interface(DHBackend) @utils.register_interface(ScryptBackend) class MultiBackend(object): name = "multibackend" def __init__(self, backends): if len(backends) == 0: raise ValueError( "Multibackend cannot be initialized with no backends. If you " "are seeing this error when trying to use default_backend() " "please try uninstalling and reinstalling cryptography." ) self._backends = backends def _filtered_backends(self, interface): for b in self._backends: if isinstance(b, interface): yield b def cipher_supported(self, cipher, mode): return any( b.cipher_supported(cipher, mode) for b in self._filtered_backends(CipherBackend) ) def create_symmetric_encryption_ctx(self, cipher, mode): for b in self._filtered_backends(CipherBackend): try: return b.create_symmetric_encryption_ctx(cipher, mode) except UnsupportedAlgorithm: pass raise UnsupportedAlgorithm( "cipher {0} in {1} mode is not supported by this backend.".format( cipher.name, mode.name if mode else mode), _Reasons.UNSUPPORTED_CIPHER ) def create_symmetric_decryption_ctx(self, cipher, mode): for b in self._filtered_backends(CipherBackend): try: return b.create_symmetric_decryption_ctx(cipher, mode) except UnsupportedAlgorithm: pass raise UnsupportedAlgorithm( "cipher {0} in {1} mode is not supported by this backend.".format( cipher.name, mode.name if mode else mode), _Reasons.UNSUPPORTED_CIPHER ) def hash_supported(self, algorithm): return any( b.hash_supported(algorithm) for b in self._filtered_backends(HashBackend) ) def create_hash_ctx(self, algorithm): for b in self._filtered_backends(HashBackend): try: return b.create_hash_ctx(algorithm) except UnsupportedAlgorithm: pass raise UnsupportedAlgorithm( "{0} is not a supported hash on this backend.".format( algorithm.name), _Reasons.UNSUPPORTED_HASH ) def hmac_supported(self, algorithm): return any(