1 /* 2 * Copyright (C) 2020 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ATTESTATION_HMACKEYMANAGER_H 18 #define ATTESTATION_HMACKEYMANAGER_H 19 20 #include <array> 21 22 namespace android { 23 /** 24 * Invalid value of HMAC - SHA256. Any events with this HMAC value will be marked as not verified. 25 */ 26 constexpr std::array<uint8_t, 32> INVALID_HMAC = {0}; 27 28 class HmacKeyManager { 29 public: 30 HmacKeyManager(); 31 std::array<uint8_t, 32> sign(const uint8_t* data, size_t size) const; 32 private: 33 const std::array<uint8_t, 128> mHmacKey; 34 }; 35 } // namespace android 36 37 #endif // ATTESTATION_HMACKEYMANAGER_H