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https://github.com/kidfromjupiter/nearby.git
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85 lines
3.0 KiB
C++
85 lines
3.0 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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#ifndef THIRD_PARTY_NEARBY_FASTPAIR_DATAPARSER_FAST_PAIR_DATA_PARSER_H_
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#define THIRD_PARTY_NEARBY_FASTPAIR_DATAPARSER_FAST_PAIR_DATA_PARSER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <array>
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#include <functional>
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#include <optional>
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#include <string>
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#include <vector>
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#include "absl/functional/any_invocable.h"
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#include "absl/strings/string_view.h"
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#include "fastpair/common/non_discoverable_advertisement.h"
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#include "fastpair/crypto/decrypted_passkey.h"
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#include "fastpair/crypto/decrypted_response.h"
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namespace nearby {
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namespace fastpair {
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// This class is responsible for parsing the untrusted bytes for Fast Pair.
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class FastPairDataParser {
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using GetHexModelIdFromServiceDataCallback =
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absl::AnyInvocable<void(std::optional<absl::string_view>)>;
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using ParseDecryptResponseCallback =
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absl::AnyInvocable<void(std::optional<DecryptedResponse>)>;
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using ParseDecryptPasskeyCallback =
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absl::AnyInvocable<void(std::optional<DecryptedPasskey>)>;
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using ParseNotDiscoverableAdvertisementCallback =
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absl::AnyInvocable<void(std::optional<NonDiscoverableAdvertisement>)>;
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public:
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// Gets the hex string representation of the device's model ID from the
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// service data.
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static void GetHexModelIdFromServiceData(
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const std::vector<uint8_t>& fast_pair_service_data,
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GetHexModelIdFromServiceDataCallback callback);
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// Decrypts |encrypted_response_bytes| using |aes_key| and returns a parsed
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// DecryptedResponse instance if possible.
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static void 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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// Decrypts |encrypted_passkey_bytes| using |aes_key| and returns a parsed
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// DecryptedPasskey instance if possible.
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static void 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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// Parses a 'Non Discoverable' advertisement from |service_data|.
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// If the advertisement does not contain information about salt, use the
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// |address| as salt instead.
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static void ParseNotDiscoverableAdvertisement(
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absl::string_view fast_pair_service_data, absl::string_view address,
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ParseNotDiscoverableAdvertisementCallback callback);
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};
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} // namespace fastpair
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} // namespace nearby
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#endif // THIRD_PARTY_NEARBY_FASTPAIR_DATAPARSER_FAST_PAIR_DATA_PARSER_H_
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