mirror of
https://github.com/kidfromjupiter/nearby.git
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109 lines
3.7 KiB
C++
109 lines
3.7 KiB
C++
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "fastpair/dataparser/fast_pair_data_parser.h"
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#include <algorithm>
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#include <array>
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#include <cstdint>
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#include <optional>
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#include <string>
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#include <vector>
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#include "third_party/nearby//fastpair/crypto/fast_pair_decryption.h"
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#include "fastpair/common/constant.h"
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#include "fastpair/dataparser/fast_pair_decoder.h"
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#include "internal/platform/logging.h"
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namespace nearby {
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namespace fastpair {
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namespace {
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bool ValidateInputSizes(const std::vector<uint8_t>& aes_key_bytes,
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const std::vector<uint8_t>& encrypted_bytes) {
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if (aes_key_bytes.size() != kAesBlockByteSize) {
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NEARBY_LOGS(WARNING) << __func__
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<< ": AES key should have size = " << kAesBlockByteSize
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<< ", actual = " << aes_key_bytes.size();
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return false;
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}
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if (encrypted_bytes.size() != kEncryptedDataByteSize) {
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NEARBY_LOGS(WARNING) << __func__ << ": Encrypted bytes should have size = "
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<< kEncryptedDataByteSize
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<< ", actual = " << encrypted_bytes.size();
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return false;
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}
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return true;
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}
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void ConvertVectorsToArrays(
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const std::vector<uint8_t>& aes_key_bytes,
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const std::vector<uint8_t>& encrypted_bytes,
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std::array<uint8_t, kAesBlockByteSize>& out_aes_key_bytes,
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std::array<uint8_t, kEncryptedDataByteSize>& out_encrypted_bytes) {
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std::copy(aes_key_bytes.begin(), aes_key_bytes.end(),
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out_aes_key_bytes.begin());
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std::copy(encrypted_bytes.begin(), encrypted_bytes.end(),
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out_encrypted_bytes.begin());
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}
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} // namespace
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void FastPairDataParser::GetHexModelIdFromServiceData(
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const std::vector<uint8_t>& service_data,
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GetHexModelIdFromServiceDataCallback callback) {
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callback.on_retrieved_cb(
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FastPairDecoder::HasModelId(&service_data)
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? FastPairDecoder::GetHexModelIdFromServiceData(&service_data)
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: std::nullopt);
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}
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void FastPairDataParser::ParseDecryptedResponse(
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const std::vector<uint8_t>& aes_key_bytes,
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const std::vector<uint8_t>& encrypted_response_bytes,
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ParseDecryptResponseCallback callback) {
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if (!ValidateInputSizes(aes_key_bytes, encrypted_response_bytes)) {
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callback.on_decrypted_cb(std::nullopt);
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return;
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}
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std::array<uint8_t, kAesBlockByteSize> key;
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std::array<uint8_t, kEncryptedDataByteSize> bytes;
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ConvertVectorsToArrays(aes_key_bytes, encrypted_response_bytes, key, bytes);
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callback.on_decrypted_cb(
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FastPairDecryption::ParseDecryptResponse(key, bytes));
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}
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void FastPairDataParser::ParseDecryptedPasskey(
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const std::vector<uint8_t>& aes_key_bytes,
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const std::vector<uint8_t>& encrypted_passkey_bytes,
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ParseDecryptPasskeyCallback callback) {
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if (!ValidateInputSizes(aes_key_bytes, encrypted_passkey_bytes)) {
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callback.on_decrypted_cb(std::nullopt);
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return;
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}
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std::array<uint8_t, kAesBlockByteSize> key;
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std::array<uint8_t, kEncryptedDataByteSize> bytes;
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ConvertVectorsToArrays(aes_key_bytes, encrypted_passkey_bytes, key, bytes);
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callback.on_decrypted_cb(FastPairDecryption::ParseDecryptPasskey(key, bytes));
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}
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} // namespace fastpair
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} // namespace nearby
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