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1# This file is dual licensed under the terms of the Apache License, Version
2# 2.0, and the BSD License. See the LICENSE file in the root of this repository
3# for complete details.
4
5from __future__ import absolute_import, division, print_function
6
7import abc
8
9import six
10
11from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
12
13
14@six.add_metaclass(abc.ABCMeta)
15class X448PublicKey(object):
16    @classmethod
17    def from_public_bytes(cls, data):
18        from cryptography.hazmat.backends.openssl.backend import backend
19
20        if not backend.x448_supported():
21            raise UnsupportedAlgorithm(
22                "X448 is not supported by this version of OpenSSL.",
23                _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
24            )
25
26        return backend.x448_load_public_bytes(data)
27
28    @abc.abstractmethod
29    def public_bytes(self, encoding, format):
30        """
31        The serialized bytes of the public key.
32        """
33
34
35@six.add_metaclass(abc.ABCMeta)
36class X448PrivateKey(object):
37    @classmethod
38    def generate(cls):
39        from cryptography.hazmat.backends.openssl.backend import backend
40
41        if not backend.x448_supported():
42            raise UnsupportedAlgorithm(
43                "X448 is not supported by this version of OpenSSL.",
44                _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
45            )
46        return backend.x448_generate_key()
47
48    @classmethod
49    def from_private_bytes(cls, data):
50        from cryptography.hazmat.backends.openssl.backend import backend
51
52        if not backend.x448_supported():
53            raise UnsupportedAlgorithm(
54                "X448 is not supported by this version of OpenSSL.",
55                _Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
56            )
57
58        return backend.x448_load_private_bytes(data)
59
60    @abc.abstractmethod
61    def public_key(self):
62        """
63        The serialized bytes of the public key.
64        """
65
66    @abc.abstractmethod
67    def private_bytes(self, encoding, format, encryption_algorithm):
68        """
69        The serialized bytes of the private key.
70        """
71
72    @abc.abstractmethod
73    def exchange(self, peer_public_key):
74        """
75        Performs a key exchange operation using the provided peer's public key.
76        """
77