# 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 import abc import six from cryptography.exceptions import UnsupportedAlgorithm, _Reasons @six.add_metaclass(abc.ABCMeta) class X448PublicKey(object): @classmethod def from_public_bytes(cls, data): from cryptography.hazmat.backends.openssl.backend import backend if not backend.x448_supported(): raise UnsupportedAlgorithm( "X448 is not supported by this version of OpenSSL.", _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM, ) return backend.x448_load_public_bytes(data) @abc.abstractmethod def public_bytes(self, encoding, format): """ The serialized bytes of the public key. """ @six.add_metaclass(abc.ABCMeta) class X448PrivateKey(object): @classmethod def generate(cls): from cryptography.hazmat.backends.openssl.backend import backend if not backend.x448_supported(): raise UnsupportedAlgorithm( "X448 is not supported by this version of OpenSSL.", _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM, ) return backend.x448_generate_key() @classmethod def from_private_bytes(cls, data): from cryptography.hazmat.backends.openssl.backend import backend if not backend.x448_supported(): raise UnsupportedAlgorithm( "X448 is not supported by this version of OpenSSL.", _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM, ) return backend.x448_load_private_bytes(data) @abc.abstractmethod def public_key(self): """ The serialized bytes of the public key. """ @abc.abstractmethod def private_bytes(self, encoding, format, encryption_algorithm): """ The serialized bytes of the private key. """ @abc.abstractmethod def exchange(self, peer_public_key): """ Performs a key exchange operation using the provided peer's public key. """