blob: 5c30288fcb5a98c68ecea955fbf456c4d4dc9e69 [file] [log] [blame]
/******************************************************************************
*
* 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 <algorithm>
#include <base/logging.h>
#include <openssl/hmac.h>
#include "bt_trace.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