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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 cryptography.hazmat.backends.openssl.utils import _evp_pkey_derive
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric.x448 import (
X448PrivateKey,
X448PublicKey,
)
_X448_KEY_SIZE = 56
class _X448PublicKey(X448PublicKey):
def __init__(self, backend, evp_pkey):
self._backend = backend
self._evp_pkey = evp_pkey
def public_bytes(
self,
encoding: serialization.Encoding,
format: serialization.PublicFormat,
) -> bytes:
if (
encoding is serialization.Encoding.Raw
or format is serialization.PublicFormat.Raw
):
if (
encoding is not serialization.Encoding.Raw
or format is not serialization.PublicFormat.Raw
):
raise ValueError(
"When using Raw both encoding and format must be Raw"
)
return self._raw_public_bytes()
return self._backend._public_key_bytes(
encoding, format, self, self._evp_pkey, None
)
def _raw_public_bytes(self) -> bytes:
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)[:]
class _X448PrivateKey(X448PrivateKey):
def __init__(self, backend, evp_pkey):
self._backend = backend
self._evp_pkey = evp_pkey
def public_key(self) -> X448PublicKey:
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: X448PublicKey) -> bytes:
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)
def private_bytes(
self,
encoding: serialization.Encoding,
format: serialization.PrivateFormat,
encryption_algorithm: serialization.KeySerializationEncryption,
) -> bytes:
if (
encoding is serialization.Encoding.Raw
or format is serialization.PublicFormat.Raw
):
if (
format is not serialization.PrivateFormat.Raw
or encoding is not serialization.Encoding.Raw
or not isinstance(
encryption_algorithm, serialization.NoEncryption
)
):
raise ValueError(
"When using Raw both encoding and format must be Raw "
"and encryption_algorithm must be NoEncryption()"
)
return self._raw_private_bytes()
return self._backend._private_key_bytes(
encoding, format, encryption_algorithm, self, self._evp_pkey, None
)
def _raw_private_bytes(self) -> bytes:
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_private_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)[:]