mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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123 lines
4.4 KiB
Python
123 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.x25519 import (
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X25519PrivateKey,
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X25519PublicKey,
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)
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_X25519_KEY_SIZE = 32
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@utils.register_interface(X25519PublicKey)
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class _X25519PublicKey(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
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or format is serialization.PublicFormat.Raw
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):
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if (
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encoding is not serialization.Encoding.Raw
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or 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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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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ucharpp = self._backend._ffi.new("unsigned char **")
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res = self._backend._lib.EVP_PKEY_get1_tls_encodedpoint(
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self._evp_pkey, ucharpp
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)
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self._backend.openssl_assert(res == 32)
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self._backend.openssl_assert(ucharpp[0] != self._backend._ffi.NULL)
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data = self._backend._ffi.gc(
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ucharpp[0], self._backend._lib.OPENSSL_free
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)
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return self._backend._ffi.buffer(data, res)[:]
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@utils.register_interface(X25519PrivateKey)
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class _X25519PrivateKey(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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bio = self._backend._create_mem_bio_gc()
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res = self._backend._lib.i2d_PUBKEY_bio(bio, self._evp_pkey)
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self._backend.openssl_assert(res == 1)
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evp_pkey = self._backend._lib.d2i_PUBKEY_bio(
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bio, self._backend._ffi.NULL
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)
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self._backend.openssl_assert(evp_pkey != self._backend._ffi.NULL)
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evp_pkey = self._backend._ffi.gc(
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evp_pkey, self._backend._lib.EVP_PKEY_free
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)
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return _X25519PublicKey(self._backend, evp_pkey)
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def exchange(self, peer_public_key):
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if not isinstance(peer_public_key, X25519PublicKey):
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raise TypeError("peer_public_key must be X25519PublicKey.")
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return _evp_pkey_derive(self._backend, self._evp_pkey, peer_public_key)
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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
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or format is serialization.PublicFormat.Raw
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):
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if (
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format is not serialization.PrivateFormat.Raw
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or encoding is not serialization.Encoding.Raw
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or not isinstance(
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encryption_algorithm, serialization.NoEncryption
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)
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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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return self._backend._private_key_bytes(
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encoding, format, encryption_algorithm, self, self._evp_pkey, None
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)
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def _raw_private_bytes(self):
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# When we drop support for CRYPTOGRAPHY_OPENSSL_LESS_THAN_111 we can
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# switch this to EVP_PKEY_new_raw_private_key
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# The trick we use here is serializing to a PKCS8 key and just
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# using the last 32 bytes, which is the key itself.
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bio = self._backend._create_mem_bio_gc()
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res = self._backend._lib.i2d_PKCS8PrivateKey_bio(
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bio,
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self._evp_pkey,
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self._backend._ffi.NULL,
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self._backend._ffi.NULL,
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0,
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self._backend._ffi.NULL,
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self._backend._ffi.NULL,
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)
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self._backend.openssl_assert(res == 1)
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pkcs8 = self._backend._read_mem_bio(bio)
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self._backend.openssl_assert(len(pkcs8) == 48)
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return pkcs8[-_X25519_KEY_SIZE:]
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