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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
_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.
"""