mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-14 22:56:12 -04:00
109 lines
3.7 KiB
C++
109 lines
3.7 KiB
C++
// Copyright 2022 Google LLC
|
|
//
|
|
// 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
|
|
//
|
|
// https://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.
|
|
|
|
#include "fastpair/dataparser/fast_pair_data_parser.h"
|
|
|
|
#include <algorithm>
|
|
#include <array>
|
|
#include <cstdint>
|
|
#include <optional>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "third_party/nearby//fastpair/crypto/fast_pair_decryption.h"
|
|
#include "fastpair/common/constant.h"
|
|
#include "fastpair/dataparser/fast_pair_decoder.h"
|
|
#include "internal/platform/logging.h"
|
|
|
|
namespace nearby {
|
|
namespace fastpair {
|
|
|
|
namespace {
|
|
bool ValidateInputSizes(const std::vector<uint8_t>& aes_key_bytes,
|
|
const std::vector<uint8_t>& encrypted_bytes) {
|
|
if (aes_key_bytes.size() != kAesBlockByteSize) {
|
|
NEARBY_LOGS(WARNING) << __func__
|
|
<< ": AES key should have size = " << kAesBlockByteSize
|
|
<< ", actual = " << aes_key_bytes.size();
|
|
return false;
|
|
}
|
|
|
|
if (encrypted_bytes.size() != kEncryptedDataByteSize) {
|
|
NEARBY_LOGS(WARNING) << __func__ << ": Encrypted bytes should have size = "
|
|
<< kEncryptedDataByteSize
|
|
<< ", actual = " << encrypted_bytes.size();
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void ConvertVectorsToArrays(
|
|
const std::vector<uint8_t>& aes_key_bytes,
|
|
const std::vector<uint8_t>& encrypted_bytes,
|
|
std::array<uint8_t, kAesBlockByteSize>& out_aes_key_bytes,
|
|
std::array<uint8_t, kEncryptedDataByteSize>& out_encrypted_bytes) {
|
|
std::copy(aes_key_bytes.begin(), aes_key_bytes.end(),
|
|
out_aes_key_bytes.begin());
|
|
std::copy(encrypted_bytes.begin(), encrypted_bytes.end(),
|
|
out_encrypted_bytes.begin());
|
|
}
|
|
|
|
} // namespace
|
|
|
|
void FastPairDataParser::GetHexModelIdFromServiceData(
|
|
const std::vector<uint8_t>& service_data,
|
|
GetHexModelIdFromServiceDataCallback callback) {
|
|
callback.on_retrieved_cb(
|
|
FastPairDecoder::HasModelId(&service_data)
|
|
? FastPairDecoder::GetHexModelIdFromServiceData(&service_data)
|
|
: std::nullopt);
|
|
}
|
|
|
|
void FastPairDataParser::ParseDecryptedResponse(
|
|
const std::vector<uint8_t>& aes_key_bytes,
|
|
const std::vector<uint8_t>& encrypted_response_bytes,
|
|
ParseDecryptResponseCallback callback) {
|
|
if (!ValidateInputSizes(aes_key_bytes, encrypted_response_bytes)) {
|
|
callback.on_decrypted_cb(std::nullopt);
|
|
return;
|
|
}
|
|
|
|
std::array<uint8_t, kAesBlockByteSize> key;
|
|
std::array<uint8_t, kEncryptedDataByteSize> bytes;
|
|
ConvertVectorsToArrays(aes_key_bytes, encrypted_response_bytes, key, bytes);
|
|
|
|
callback.on_decrypted_cb(
|
|
FastPairDecryption::ParseDecryptResponse(key, bytes));
|
|
}
|
|
|
|
void FastPairDataParser::ParseDecryptedPasskey(
|
|
const std::vector<uint8_t>& aes_key_bytes,
|
|
const std::vector<uint8_t>& encrypted_passkey_bytes,
|
|
ParseDecryptPasskeyCallback callback) {
|
|
if (!ValidateInputSizes(aes_key_bytes, encrypted_passkey_bytes)) {
|
|
callback.on_decrypted_cb(std::nullopt);
|
|
return;
|
|
}
|
|
|
|
std::array<uint8_t, kAesBlockByteSize> key;
|
|
std::array<uint8_t, kEncryptedDataByteSize> bytes;
|
|
ConvertVectorsToArrays(aes_key_bytes, encrypted_passkey_bytes, key, bytes);
|
|
|
|
callback.on_decrypted_cb(FastPairDecryption::ParseDecryptPasskey(key, bytes));
|
|
}
|
|
|
|
} // namespace fastpair
|
|
} // namespace nearby
|