in_memory_kms.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 <cstdint>
#include <span>
#include <string>
#include <string_view>
#include <unordered_map>
#include <vector>
 
#include "iceberg/encryption/key_management_client.h"
#include "iceberg/iceberg_bundle_export.h"
 
namespace iceberg {
 
class ICEBERG_BUNDLE_EXPORT InMemoryKms : public KeyManagementClient {
 public:
  static constexpr std::string_view kName = "in-memory";
  static constexpr std::string_view kKeyPropertyPrefix = "encryption.in-memory-kms.key.";
 
  InMemoryKms() = default;
  explicit InMemoryKms(std::unordered_map<std::string, std::vector<uint8_t>> master_keys)
      : master_keys_(std::move(master_keys)) {}
 
  static void Register();
 
  Status Initialize(
      const std::unordered_map<std::string, std::string>& properties) override;
 
  Result<std::vector<uint8_t>> WrapKey(std::span<const uint8_t> key,
                                       std::string_view wrapping_key_id) override;
  Result<std::vector<uint8_t>> UnwrapKey(std::span<const uint8_t> wrapped_key,
                                         std::string_view wrapping_key_id) override;
 
 private:
  Result<const std::vector<uint8_t>*> MasterKey(std::string_view id) const;
 
  std::unordered_map<std::string, std::vector<uint8_t>> master_keys_;
};
 
}  // namespace iceberg