| /****************************************************************************** |
| * |
| * Copyright 2018 Google, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ******************************************************************************/ |
| |
| #include "address_obfuscator.h" |
| |
| #include <base/logging.h> |
| #include <openssl/hmac.h> |
| |
| #include <algorithm> |
| |
| #include "internal_include/bt_trace.h" |
| #include "types/raw_address.h" |
| |
| namespace bluetooth { |
| namespace common { |
| |
| bool AddressObfuscator::IsSaltValid(const Octet32& salt_256bit) { |
| return !std::all_of(salt_256bit.begin(), salt_256bit.end(), |
| [](uint8_t i) { return i == 0; }); |
| } |
| |
| void AddressObfuscator::Initialize(const Octet32& salt_256bit) { |
| std::lock_guard<std::recursive_mutex> lock(instance_mutex_); |
| salt_256bit_ = salt_256bit; |
| } |
| |
| bool AddressObfuscator::IsInitialized() { |
| std::lock_guard<std::recursive_mutex> lock(instance_mutex_); |
| return IsSaltValid(salt_256bit_); |
| } |
| |
| std::string AddressObfuscator::Obfuscate(const RawAddress& address) { |
| std::lock_guard<std::recursive_mutex> lock(instance_mutex_); |
| CHECK(IsInitialized()); |
| std::array<uint8_t, EVP_MAX_MD_SIZE> result = {}; |
| unsigned int out_len = 0; |
| CHECK(::HMAC(EVP_sha256(), salt_256bit_.data(), salt_256bit_.size(), |
| address.address, address.kLength, result.data(), |
| &out_len) != nullptr); |
| CHECK_EQ(out_len, static_cast<unsigned int>(kOctet32Length)); |
| return std::string(reinterpret_cast<const char*>(result.data()), out_len); |
| } |
| |
| } // namespace common |
| } // namespace bluetooth |