86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
/*
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* AsyncFileEncrypted.h
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "fdbrpc/IAsyncFile.h"
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#include "flow/FastRef.h"
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#include "flow/flow.h"
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#include "flow/IRandom.h"
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#include "flow/StreamCipher.h"
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#if ENCRYPTION_ENABLED
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#include <array>
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/*
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* Append-only file encrypted using AES-128-GCM.
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* */
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class AsyncFileEncrypted : public IAsyncFile, public ReferenceCounted<AsyncFileEncrypted> {
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public:
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enum class Mode { APPEND_ONLY, READ_ONLY };
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private:
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Reference<IAsyncFile> file;
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StreamCipher::IV firstBlockIV;
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StreamCipher::IV getIV(uint16_t block) const;
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Mode mode;
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Future<Void> writeLastBlockToFile();
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friend class AsyncFileEncryptedImpl;
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// Reading:
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class RandomCache {
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size_t maxSize;
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std::vector<uint16_t> vec;
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std::unordered_map<uint16_t, Standalone<StringRef>> hashMap;
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size_t evict();
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public:
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RandomCache(size_t maxSize);
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void insert(uint16_t block, const Standalone<StringRef>& value);
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Optional<Standalone<StringRef>> get(uint16_t block) const;
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} readBuffers;
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// Writing (append only):
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std::unique_ptr<EncryptionStreamCipher> encryptor;
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uint16_t currentBlock{ 0 };
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int offsetInBlock{ 0 };
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std::vector<unsigned char> writeBuffer;
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Future<Void> initialize();
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public:
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AsyncFileEncrypted(Reference<IAsyncFile>, Mode);
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void addref() override;
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void delref() override;
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Future<int> read(void* data, int length, int64_t offset) override;
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Future<Void> write(void const* data, int length, int64_t offset) override;
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Future<Void> zeroRange(int64_t offset, int64_t length) override;
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Future<Void> truncate(int64_t size) override;
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Future<Void> sync() override;
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Future<Void> flush() override;
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Future<int64_t> size() const override;
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std::string getFilename() const override;
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Future<Void> readZeroCopy(void** data, int* length, int64_t offset) override;
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void releaseZeroCopy(void* data, int length, int64_t offset) override;
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int64_t debugFD() const override;
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};
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#endif // ENCRYPTION_ENABLED
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