mirror of
https://github.com/kidfromjupiter/nearby.git
synced 2026-09-15 15:16:12 -04:00
Alexey Polyudov
4e3f343b7a
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I1f0b645549f75c08a7af4512265cef8eadc7e672
80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
// Copyright 2020 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 "core_v2/internal/mediums/utils.h"
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#include <memory>
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#include <string>
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#include "platform_v2/base/prng.h"
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#include "platform_v2/public/crypto.h"
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namespace location {
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namespace nearby {
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namespace connections {
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namespace {
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constexpr absl::string_view kUpgradeServiceIdPostfix = "_UPGRADE";
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}
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ByteArray Utils::GenerateRandomBytes(size_t length) {
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Prng rng;
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std::string data;
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data.reserve(length);
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// Adds 4 random bytes per iteration.
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while (length > 0) {
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std::uint32_t val = rng.NextUint32();
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for (int i = 0; i < 4; i++) {
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data += val & 0xFF;
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val >>= 8;
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length--;
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if (!length) break;
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}
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}
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return ByteArray(data);
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}
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ByteArray Utils::Sha256Hash(const ByteArray& source, size_t length) {
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return Utils::Sha256Hash(std::string(source), length);
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}
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ByteArray Utils::Sha256Hash(const std::string& source, size_t length) {
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ByteArray full_hash(length);
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full_hash.CopyAt(0, Crypto::Sha256(source));
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return full_hash;
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}
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std::string Utils::WrapUpgradeServiceId(const std::string& service_id) {
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if (service_id.empty()) {
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return {};
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}
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return service_id + std::string(kUpgradeServiceIdPostfix);
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}
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std::string Utils::UnwrapUpgradeServiceId(
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const std::string& upgrade_service_id) {
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auto pos = upgrade_service_id.find(std::string(kUpgradeServiceIdPostfix));
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if (pos != std::string::npos) {
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return std::string(upgrade_service_id, 0, pos);
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}
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return upgrade_service_id;
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}
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} // namespace connections
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} // namespace nearby
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} // namespace location
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