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File Name : x448.py

# 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 import serialization
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, encoding, format):
        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):
        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)

def private_bytes(self, encoding, format, encryption_algorithm):
        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):
        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)[:]

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-09-09 12:51:37
..	dir	-	root/root	0755	2025-09-09 12:51:37
__pycache__	dir	-	root/root	0755	2025-09-09 12:51:37
__init__.py	file	336 B	root/root	0644	2020-10-28 03:11:40
aead.py	file	5.63 KB	root/root	0644	2020-10-28 03:11:40
backend.py	file	104.49 KB	root/root	0644	2025-08-26 10:01:14
ciphers.py	file	8.43 KB	root/root	0644	2025-08-26 10:01:14
cmac.py	file	2.83 KB	root/root	0644	2025-08-26 10:01:14
decode_asn1.py	file	31.59 KB	root/root	0644	2020-10-28 03:11:53
dh.py	file	10 KB	root/root	0644	2020-10-28 03:11:40
dsa.py	file	9.8 KB	root/root	0644	2020-10-28 03:11:40
ec.py	file	11.8 KB	root/root	0644	2020-10-28 03:11:53
ed25519.py	file	5.54 KB	root/root	0644	2020-10-28 03:11:53
ed448.py	file	5.49 KB	root/root	0644	2020-10-28 03:11:53
encode_asn1.py	file	23 KB	root/root	0644	2020-10-28 03:11:40
hashes.py	file	3.09 KB	root/root	0644	2020-10-28 03:11:53
hmac.py	file	2.99 KB	root/root	0644	2025-08-26 10:01:14
ocsp.py	file	13.7 KB	root/root	0644	2020-10-28 03:11:40
poly1305.py	file	2.36 KB	root/root	0644	2020-10-28 03:11:53
rsa.py	file	16.97 KB	root/root	0644	2020-10-28 03:11:40
utils.py	file	2.25 KB	root/root	0644	2020-10-28 03:11:40
x25519.py	file	4.38 KB	root/root	0644	2020-10-28 03:11:40
x448.py	file	3.92 KB	root/root	0644	2020-10-28 03:11:40
x509.py	file	21.18 KB	root/root	0644	2025-08-26 10:01:14

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