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72 lines
2.3 KiB
C++
72 lines
2.3 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 CORE_INTERNAL_MEDIUMS_BLE_UTILS_H_
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#define CORE_INTERNAL_MEDIUMS_BLE_UTILS_H_
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#include <cstddef>
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#include <optional>
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#include <string>
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#include "absl/base/attributes.h"
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#include "connections/implementation/mediums/ble//ble_advertisement.h"
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#include "internal/platform/byte_array.h"
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#include "internal/platform/uuid.h"
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namespace nearby {
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namespace connections {
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namespace mediums {
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namespace bleutils {
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ABSL_CONST_INIT extern const Uuid kCopresenceServiceUuid;
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ABSL_CONST_INIT extern const Uuid kDctServiceUuid;
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// Return SHA256 hash.
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//
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// source - the string to be hashed.
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// size - size of returned byte array.
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ByteArray GenerateHash(const std::string& source, size_t size);
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// Return SHA256 hash of service ID.
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//
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// source - service id.
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// version - BleAdvertisement::Version. kV1 has been deprecated and just used
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// for testing.
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ByteArray GenerateServiceIdHash(
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const std::string& service_id,
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BleAdvertisement::Version version = BleAdvertisement::Version::kV2);
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// Returns device token generated by SHA256 hash in random uint32 and
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// size of mediums::BleAdvertisement::kDeviceTokenLength
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ByteArray GenerateDeviceToken();
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// Return SHA256 hash of advertisement byte array.
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//
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// advertisement_bytes - advertisement byte array.
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// The generated hash size is determined by byte array size of input.
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ByteArray GenerateAdvertisementHash(const ByteArray& advertisement_bytes);
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// Generates a BLE characteristic UUID for an advertisement at the given slot.
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//
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// slot - the advertisement slot to generate a UUID for.
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// NOLINTNEXTLINE(google3-legacy-absl-backports)
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std::optional<Uuid> GenerateAdvertisementUuid(int slot);
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} // namespace bleutils
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} // namespace mediums
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} // namespace connections
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} // namespace nearby
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#endif // CORE_INTERNAL_MEDIUMS_BLE_UTILS_H_
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