/******************************************************************************
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*
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* Copyright 2018 Google, Inc.
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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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* http://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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*
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******************************************************************************/
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#include "address_obfuscator.h"
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#include <algorithm>
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#include <base/logging.h>
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#include <openssl/hmac.h>
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#include "bt_trace.h"
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namespace bluetooth {
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namespace common {
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bool AddressObfuscator::IsSaltValid(const Octet32& salt_256bit) {
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return !std::all_of(salt_256bit.begin(), salt_256bit.end(),
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[](uint8_t i) { return i == 0; });
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}
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void AddressObfuscator::Initialize(const Octet32& salt_256bit) {
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std::lock_guard<std::recursive_mutex> lock(instance_mutex_);
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salt_256bit_ = salt_256bit;
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}
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bool AddressObfuscator::IsInitialized() {
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std::lock_guard<std::recursive_mutex> lock(instance_mutex_);
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return IsSaltValid(salt_256bit_);
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}
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std::string AddressObfuscator::Obfuscate(const RawAddress& address) {
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std::lock_guard<std::recursive_mutex> lock(instance_mutex_);
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CHECK(IsInitialized());
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std::array<uint8_t, EVP_MAX_MD_SIZE> result = {};
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unsigned int out_len = 0;
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CHECK(::HMAC(EVP_sha256(), salt_256bit_.data(), salt_256bit_.size(),
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address.address, address.kLength, result.data(),
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&out_len) != nullptr);
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CHECK_EQ(out_len, static_cast<unsigned int>(kOctet32Length));
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return std::string(reinterpret_cast<const char*>(result.data()), out_len);
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}
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} // namespace common
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} // namespace bluetooth
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