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#
# Copyright 2022 aiohomekit team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
from __future__ import annotations
from aiohomekit.crypto.chacha20poly1305 import (
PACK_NONCE,
ChaCha20Poly1305Decryptor,
ChaCha20Poly1305Encryptor,
ChaCha20Poly1305PartialTag,
)
from aiohomekit.crypto.chacha20poly1305 import DecryptionError # noqa: F401
class EncryptionKey:
def __init__(self, key: bytes):
self.key = ChaCha20Poly1305Encryptor(key)
self.counter = 0
def encrypt(self, data: bytes) -> bytes:
data = self.key.encrypt(b"", PACK_NONCE(self.counter), data)
self.counter += 1
return data
class DecryptionKey:
def __init__(self, key: bytes):
self.key = ChaCha20Poly1305Decryptor(key)
self.counter = 0
def decrypt(self, data: bytes) -> bytes:
data = self.key.decrypt(b"", PACK_NONCE(self.counter), data)
self.counter += 1
return data
class BroadcastDecryptionKey:
def __init__(self, key: bytes) -> None:
self.key = ChaCha20Poly1305PartialTag(key)
def decrypt(
self, data: bytes | bytearray, gsn: int, advertising_identifier: bytes
) -> bytes | bool:
return self.key.open(PACK_NONCE(gsn), data, advertising_identifier)
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