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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 #include "parquet/platform.h" namespace arrow { namespace json { namespace internal { class ObjectParser; } // namespace internal } // namespace json } // namespace arrow namespace parquet::encryption { // KeyMaterial class represents the "key material", keeping the information that allows // readers to recover an encryption key (see description of the KeyMetadata class). The // keytools package (PARQUET-1373) implements the "envelope encryption" pattern, in a // "single wrapping" or "double wrapping" mode. In the single wrapping mode, the key // material is generated by encrypting the "data encryption key" (DEK) by a "master key". // In the double wrapping mode, the key material is generated by encrypting the DEK by a // "key encryption key" (KEK), that in turn is encrypted by a "master key". // // Key material is kept in a flat json object, with the following fields: // 1. "keyMaterialType" - a String, with the type of key material. In the current // version, only one value is allowed - "PKMT1" (stands // for "parquet key management tools, version 1"). For external key material storage, // this field is written in both "key metadata" and "key material" jsons. For internal // key material storage, this field is written only once in the common json. // 2. "isFooterKey" - a boolean. If true, means that the material belongs to a file footer // key, and keeps additional information (such as // KMS instance ID and URL). If false, means that the material belongs to a column // key. // 3. "kmsInstanceID" - a String, with the KMS Instance ID. Written only in footer key // material. // 4. "kmsInstanceURL" - a String, with the KMS Instance URL. Written only in footer key // material. // 5. "masterKeyID" - a String, with the ID of the master key used to generate the // material. // 6. "wrappedDEK" - a String, with the wrapped DEK (base64 encoding). // 7. "doubleWrapping" - a boolean. If true, means that the material was generated in // double wrapping mode. // If false - in single wrapping mode. // 8. "keyEncryptionKeyID" - a String, with the ID of the KEK used to generate the // material. Written only in double wrapping mode. // 9. "wrappedKEK" - a String, with the wrapped KEK (base64 encoding). Written only in // double wrapping mode. class PARQUET_EXPORT KeyMaterial { public: // these fields are defined in a specification and should never be changed static constexpr const char kKeyMaterialTypeField[] = "keyMaterialType"; static constexpr const char kKeyMaterialType1[] = "PKMT1"; static constexpr const char kFooterKeyIdInFile[] = "footerKey"; static constexpr const char kColumnKeyIdInFilePrefix[] = "columnKey"; static constexpr const char kIsFooterKeyField[] = "isFooterKey"; static constexpr const char kDoubleWrappingField[] = "doubleWrapping"; static constexpr const char kKmsInstanceIdField[] = "kmsInstanceID"; static constexpr const char kKmsInstanceUrlField[] = "kmsInstanceURL"; static constexpr const char kMasterKeyIdField[] = "masterKeyID"; static constexpr const char kWrappedDataEncryptionKeyField[] = "wrappedDEK"; static constexpr const char kKeyEncryptionKeyIdField[] = "keyEncryptionKeyID"; static constexpr const char kWrappedKeyEncryptionKeyField[] = "wrappedKEK"; public: KeyMaterial() = default; static KeyMaterial Parse(const std::string& key_material_string); static KeyMaterial Parse( const ::arrow::json::internal::ObjectParser* key_material_json); /// This method returns a json string that will be stored either inside a parquet file /// or in a key material store outside the parquet file. static std::string SerializeToJson(bool is_footer_key, const std::string& kms_instance_id, const std::string& kms_instance_url, const std::string& master_key_id, bool is_double_wrapped, const std::string& kek_id, const std::string& encoded_wrapped_kek, const std::string& encoded_wrapped_dek, bool is_internal_storage); bool is_footer_key() const { return is_footer_key_; } bool is_double_wrapped() const { return is_double_wrapped_; } const std::string& master_key_id() const { return master_key_id_; } const std::string& wrapped_dek() const { return encoded_wrapped_dek_; } const std::string& kek_id() const { return kek_id_; } const std::string& wrapped_kek() const { return encoded_wrapped_kek_; } const std::string& kms_instance_id() const { return kms_instance_id_; } const std::string& kms_instance_url() const { return kms_instance_url_; } private: KeyMaterial(bool is_footer_key, const std::string& kms_instance_id, const std::string& kms_instance_url, const std::string& master_key_id, bool is_double_wrapped, const std::string& kek_id, const std::string& encoded_wrapped_kek, const std::string& encoded_wrapped_dek); bool is_footer_key_; std::string kms_instance_id_; std::string kms_instance_url_; std::string master_key_id_; bool is_double_wrapped_; std::string kek_id_; std::string encoded_wrapped_kek_; std::string encoded_wrapped_dek_; }; } // namespace parquet::encryption