mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import abc
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import six
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from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
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@six.add_metaclass(abc.ABCMeta)
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class X25519PublicKey(object):
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@classmethod
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def from_public_bytes(cls, data):
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from cryptography.hazmat.backends.openssl.backend import backend
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if not backend.x25519_supported():
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raise UnsupportedAlgorithm(
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"X25519 is not supported by this version of OpenSSL.",
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_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
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)
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return backend.x25519_load_public_bytes(data)
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@abc.abstractmethod
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def public_bytes(self, encoding, format):
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"""
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The serialized bytes of the public key.
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"""
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@six.add_metaclass(abc.ABCMeta)
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class X25519PrivateKey(object):
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@classmethod
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def generate(cls):
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from cryptography.hazmat.backends.openssl.backend import backend
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if not backend.x25519_supported():
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raise UnsupportedAlgorithm(
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"X25519 is not supported by this version of OpenSSL.",
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_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
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)
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return backend.x25519_generate_key()
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@classmethod
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def from_private_bytes(cls, data):
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from cryptography.hazmat.backends.openssl.backend import backend
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if not backend.x25519_supported():
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raise UnsupportedAlgorithm(
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"X25519 is not supported by this version of OpenSSL.",
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_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
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)
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return backend.x25519_load_private_bytes(data)
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@abc.abstractmethod
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def public_key(self):
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"""
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The serialized bytes of the public key.
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"""
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@abc.abstractmethod
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def private_bytes(self, encoding, format, encryption_algorithm):
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"""
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The serialized bytes of the private key.
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"""
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@abc.abstractmethod
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def exchange(self, peer_public_key):
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"""
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Performs a key exchange operation using the provided peer's public key.
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"""
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