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124 lines
4.4 KiB
Python
124 lines
4.4 KiB
Python
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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from cryptography import utils
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from cryptography.hazmat.backends.openssl.utils import _evp_pkey_derive
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.asymmetric.x448 import (
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X448PrivateKey, X448PublicKey
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)
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_X448_KEY_SIZE = 56
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@utils.register_interface(X448PublicKey)
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class _X448PublicKey(object):
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def __init__(self, backend, evp_pkey):
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self._backend = backend
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self._evp_pkey = evp_pkey
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def public_bytes(self, encoding, format):
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if (
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encoding is serialization.Encoding.Raw or
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format is serialization.PublicFormat.Raw
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):
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if (
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encoding is not serialization.Encoding.Raw or
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format is not serialization.PublicFormat.Raw
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):
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raise ValueError(
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"When using Raw both encoding and format must be Raw"
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)
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return self._raw_public_bytes()
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if (
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encoding in serialization._PEM_DER and
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format is not serialization.PublicFormat.SubjectPublicKeyInfo
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):
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raise ValueError(
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"format must be SubjectPublicKeyInfo when encoding is PEM or "
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"DER"
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)
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return self._backend._public_key_bytes(
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encoding, format, self, self._evp_pkey, None
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)
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def _raw_public_bytes(self):
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buf = self._backend._ffi.new("unsigned char []", _X448_KEY_SIZE)
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buflen = self._backend._ffi.new("size_t *", _X448_KEY_SIZE)
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res = self._backend._lib.EVP_PKEY_get_raw_public_key(
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self._evp_pkey, buf, buflen
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)
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self._backend.openssl_assert(res == 1)
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self._backend.openssl_assert(buflen[0] == _X448_KEY_SIZE)
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return self._backend._ffi.buffer(buf, _X448_KEY_SIZE)[:]
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@utils.register_interface(X448PrivateKey)
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class _X448PrivateKey(object):
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def __init__(self, backend, evp_pkey):
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self._backend = backend
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self._evp_pkey = evp_pkey
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def public_key(self):
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buf = self._backend._ffi.new("unsigned char []", _X448_KEY_SIZE)
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buflen = self._backend._ffi.new("size_t *", _X448_KEY_SIZE)
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res = self._backend._lib.EVP_PKEY_get_raw_public_key(
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self._evp_pkey, buf, buflen
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)
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self._backend.openssl_assert(res == 1)
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self._backend.openssl_assert(buflen[0] == _X448_KEY_SIZE)
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return self._backend.x448_load_public_bytes(buf)
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def exchange(self, peer_public_key):
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if not isinstance(peer_public_key, X448PublicKey):
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raise TypeError("peer_public_key must be X448PublicKey.")
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return _evp_pkey_derive(
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self._backend, self._evp_pkey, peer_public_key
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)
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def private_bytes(self, encoding, format, encryption_algorithm):
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if (
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encoding is serialization.Encoding.Raw or
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format is serialization.PublicFormat.Raw
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):
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if (
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format is not serialization.PrivateFormat.Raw or
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encoding is not serialization.Encoding.Raw or not
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isinstance(encryption_algorithm, serialization.NoEncryption)
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):
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raise ValueError(
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"When using Raw both encoding and format must be Raw "
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"and encryption_algorithm must be NoEncryption"
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)
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return self._raw_private_bytes()
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if (
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encoding in serialization._PEM_DER and
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format is not serialization.PrivateFormat.PKCS8
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):
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raise ValueError(
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"format must be PKCS8 when encoding is PEM or DER"
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)
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return self._backend._private_key_bytes(
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encoding, format, encryption_algorithm, self._evp_pkey, None
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)
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def _raw_private_bytes(self):
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buf = self._backend._ffi.new("unsigned char []", _X448_KEY_SIZE)
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buflen = self._backend._ffi.new("size_t *", _X448_KEY_SIZE)
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res = self._backend._lib.EVP_PKEY_get_raw_private_key(
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self._evp_pkey, buf, buflen
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)
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self._backend.openssl_assert(res == 1)
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self._backend.openssl_assert(buflen[0] == _X448_KEY_SIZE)
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return self._backend._ffi.buffer(buf, _X448_KEY_SIZE)[:]
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