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Code Editor : x448.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 abc from cryptography.exceptions import UnsupportedAlgorithm, _Reasons from cryptography.hazmat.bindings._rust import openssl as rust_openssl from cryptography.hazmat.primitives import _serialization class X448PublicKey(metaclass=abc.ABCMeta): @classmethod def from_public_bytes(cls, data: bytes) -> X448PublicKey: 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: _serialization.Encoding, format: _serialization.PublicFormat, ) -> bytes: """ The serialized bytes of the public key. """ @abc.abstractmethod def public_bytes_raw(self) -> bytes: """ The raw bytes of the public key. Equivalent to public_bytes(Raw, Raw). """ @abc.abstractmethod def __eq__(self, other: object) -> bool: """ Checks equality. """ if hasattr(rust_openssl, "x448"): X448PublicKey.register(rust_openssl.x448.X448PublicKey) class X448PrivateKey(metaclass=abc.ABCMeta): @classmethod def generate(cls) -> X448PrivateKey: 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: bytes) -> X448PrivateKey: 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) -> X448PublicKey: """ Returns the public key associated with this private key """ @abc.abstractmethod def private_bytes( self, encoding: _serialization.Encoding, format: _serialization.PrivateFormat, encryption_algorithm: _serialization.KeySerializationEncryption, ) -> bytes: """ The serialized bytes of the private key. """ @abc.abstractmethod def private_bytes_raw(self) -> bytes: """ The raw bytes of the private key. Equivalent to private_bytes(Raw, Raw, NoEncryption()). """ @abc.abstractmethod def exchange(self, peer_public_key: X448PublicKey) -> bytes: """ Performs a key exchange operation using the provided peer's public key. """ if hasattr(rust_openssl, "x448"): X448PrivateKey.register(rust_openssl.x448.X448PrivateKey)
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