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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
from cryptography import utils
from cryptography.hazmat.backends.openssl.utils import _evp_pkey_derive
from cryptography.hazmat.primitives.asymmetric.x448 import (
X448PrivateKey, X448PublicKey
)
_X448_KEY_SIZE = 56
@utils.register_interface(X448PublicKey)
class _X448PublicKey(object):
def __init__(self, backend, evp_pkey):
self._backend = backend
self._evp_pkey = evp_pkey
def public_bytes(self):
buf = self._backend._ffi.new("unsigned char []", _X448_KEY_SIZE)
buflen = self._backend._ffi.new("size_t *", _X448_KEY_SIZE)
res = self._backend._lib.EVP_PKEY_get_raw_public_key(
self._evp_pkey, buf, buflen
)
self._backend.openssl_assert(res == 1)
self._backend.openssl_assert(buflen[0] == _X448_KEY_SIZE)
return self._backend._ffi.buffer(buf, _X448_KEY_SIZE)[:]
@utils.register_interface(X448PrivateKey)
class _X448PrivateKey(object):
def __init__(self, backend, evp_pkey):
self._backend = backend
self._evp_pkey = evp_pkey
def public_key(self):
buf = self._backend._ffi.new("unsigned char []", _X448_KEY_SIZE)
buflen = self._backend._ffi.new("size_t *", _X448_KEY_SIZE)
res = self._backend._lib.EVP_PKEY_get_raw_public_key(
self._evp_pkey, buf, buflen
)
self._backend.openssl_assert(res == 1)
self._backend.openssl_assert(buflen[0] == _X448_KEY_SIZE)
return self._backend.x448_load_public_bytes(buf)
def exchange(self, peer_public_key):
if not isinstance(peer_public_key, X448PublicKey):
raise TypeError("peer_public_key must be X448PublicKey.")
return _evp_pkey_derive(
self._backend, self._evp_pkey, peer_public_key
)
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