# 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 _ED25519_KEY_SIZE = 32 _ED25519_SIG_SIZE = 64 @six.add_metaclass(abc.ABCMeta) class Ed25519PublicKey(object): @classmethod def from_public_bytes(cls, data): from cryptography.hazmat.backends.openssl.backend import backend if not backend.ed25519_supported(): raise UnsupportedAlgorithm( "ed25519 is not supported by this version of OpenSSL.", _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM, ) return backend.ed25519_load_public_bytes(data) @abc.abstractmethod def public_bytes(self, encoding, format): """ The serialized bytes of the public key. """ @abc.abstractmethod def verify(self, signature, data): """ Verify the signature. """ @six.add_metaclass(abc.ABCMeta) class Ed25519PrivateKey(object): @classmethod def generate(cls): from cryptography.hazmat.backends.openssl.backend import backend if not backend.ed25519_supported(): raise UnsupportedAlgorithm( "ed25519 is not supported by this version of OpenSSL.", _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM, ) return backend.ed25519_generate_key() @classmethod def from_private_bytes(cls, data): from cryptography.hazmat.backends.openssl.backend import backend if not backend.ed25519_supported(): raise UnsupportedAlgorithm( "ed25519 is not supported by this version of OpenSSL.", _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM, ) return backend.ed25519_load_private_bytes(data) @abc.abstractmethod def public_key(self): """ The Ed25519PublicKey derived from the private key. """ @abc.abstractmethod def private_bytes(self, encoding, format, encryption_algorithm): """ The serialized bytes of the private key. """ @abc.abstractmethod def sign(self, data): """ Signs the data. """