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:
/
usr
/
lib64
/
python3.6
/
site-packages
/
cryptography
/
hazmat
/
primitives
/
asymmetric
/
Filename :
x25519.py
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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. from __future__ import absolute_import, division, print_function import abc import six from cryptography.exceptions import UnsupportedAlgorithm, _Reasons @six.add_metaclass(abc.ABCMeta) class X25519PublicKey(object): @classmethod def from_public_bytes(cls, data): 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, format): """ The serialized bytes of the public key. """ @six.add_metaclass(abc.ABCMeta) class X25519PrivateKey(object): @classmethod def generate(cls): 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): 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): """ 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. """