hmac_serializable.h

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//
// Copyright (C) 2020 The Android Open Source Project
//
// 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.
 
#pragma once
 
#include <functional>
#include <optional>
#include <vector>
 
#include <keymaster/serializable.h>
 
#include "cuttlefish/host/commands/secure_env/tpm_resource_manager.h"
 
namespace cuttlefish {
 
class HmacSerializable : public keymaster::Serializable {
public:
 HmacSerializable(TpmResourceManager&,
                  std::function<TpmObjectSlot(TpmResourceManager&)>,
                  uint32_t digest_size, Serializable*, const Serializable* aad);
 
 size_t SerializedSize() const override;
 uint8_t* Serialize(uint8_t* buf, const uint8_t* end) const override;
 bool Deserialize(const uint8_t** buf_ptr, const uint8_t* end) override;
 
private:
  TpmResourceManager& resource_manager_;
  std::function<TpmObjectSlot(TpmResourceManager&)> signing_key_fn_;
  uint32_t digest_size_;
  Serializable* wrapped_;
  const Serializable* aad_;
 
  std::optional<std::vector<uint8_t>> AppendAad(const uint8_t* sensitive,
                                                size_t sensitive_size) const;
};
 
}  // namespace cuttlefish