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# 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.
import abc
from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.primitives import _serialization
class X25519PublicKey(metaclass=abc.ABCMeta):
@classmethod
def from_public_bytes(cls, data: bytes) -> "X25519PublicKey":
from cryptography.hazmat.backends.openssl.backend import backend
if not backend.x25519_supported():
raise UnsupportedAlgorithm(
"X25519 is not supported by this version of OpenSSL.",
_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
)
return backend.x25519_load_public_bytes(data)
@abc.abstractmethod
def public_bytes(
self,
encoding: _serialization.Encoding,
format: _serialization.PublicFormat,
) -> bytes:
"""
The serialized bytes of the public key.
"""
class X25519PrivateKey(metaclass=abc.ABCMeta):
@classmethod
def generate(cls) -> "X25519PrivateKey":
from cryptography.hazmat.backends.openssl.backend import backend
if not backend.x25519_supported():
raise UnsupportedAlgorithm(
"X25519 is not supported by this version of OpenSSL.",
_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
)
return backend.x25519_generate_key()
@classmethod
def from_private_bytes(cls, data: bytes) -> "X25519PrivateKey":
from cryptography.hazmat.backends.openssl.backend import backend
if not backend.x25519_supported():
raise UnsupportedAlgorithm(
"X25519 is not supported by this version of OpenSSL.",
_Reasons.UNSUPPORTED_EXCHANGE_ALGORITHM,
)
return backend.x25519_load_private_bytes(data)
@abc.abstractmethod
def public_key(self) -> X25519PublicKey:
"""
The serialized bytes of the public 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 exchange(self, peer_public_key: X25519PublicKey) -> bytes:
"""
Performs a key exchange operation using the provided peer's public key.
"""