91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
#pragma once
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#ifndef BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_ENCRYPTEDBLOCKSTORE_H_
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#define BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_ENCRYPTEDBLOCKSTORE_H_
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#include "../../interface/BlockStore.h"
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#include <messmer/cpp-utils/macros.h>
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#include <messmer/cpp-utils/pointer/cast.h>
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#include "EncryptedBlock.h"
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#include <iostream>
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namespace blockstore {
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namespace encrypted {
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template<class Cipher>
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class EncryptedBlockStore: public BlockStore {
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public:
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EncryptedBlockStore(cpputils::unique_ref<BlockStore> baseBlockStore, const typename Cipher::EncryptionKey &encKey);
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//TODO Are createKey() tests included in generic BlockStoreTest? If not, add it!
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Key createKey() override;
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boost::optional<cpputils::unique_ref<Block>> tryCreate(const Key &key, cpputils::Data data) override;
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boost::optional<cpputils::unique_ref<Block>> load(const Key &key) override;
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void remove(cpputils::unique_ref<Block> block) override;
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uint64_t numBlocks() const override;
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//This function should only be used by test cases
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void __setKey(const typename Cipher::EncryptionKey &encKey);
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private:
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cpputils::unique_ref<BlockStore> _baseBlockStore;
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typename Cipher::EncryptionKey _encKey;
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DISALLOW_COPY_AND_ASSIGN(EncryptedBlockStore);
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};
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template<class Cipher>
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EncryptedBlockStore<Cipher>::EncryptedBlockStore(cpputils::unique_ref<BlockStore> baseBlockStore, const typename Cipher::EncryptionKey &encKey)
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: _baseBlockStore(std::move(baseBlockStore)), _encKey(encKey) {
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}
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template<class Cipher>
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Key EncryptedBlockStore<Cipher>::createKey() {
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return _baseBlockStore->createKey();
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}
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template<class Cipher>
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boost::optional<cpputils::unique_ref<Block>> EncryptedBlockStore<Cipher>::tryCreate(const Key &key, cpputils::Data data) {
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//TODO Test that this returns boost::none when base blockstore returns nullptr (for all pass-through-blockstores)
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//TODO Easier implementation? This is only so complicated because of the case EncryptedBlock -> Block
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auto result = EncryptedBlock<Cipher>::TryCreateNew(_baseBlockStore.get(), key, std::move(data), _encKey);
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if (result == boost::none) {
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return boost::none;
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}
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return cpputils::unique_ref<Block>(std::move(*result));
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}
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template<class Cipher>
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boost::optional<cpputils::unique_ref<Block>> EncryptedBlockStore<Cipher>::load(const Key &key) {
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auto block = _baseBlockStore->load(key);
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if (block == boost::none) {
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//TODO Test this path (for all pass-through-blockstores)
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return boost::none;
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}
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return boost::optional<cpputils::unique_ref<Block>>(EncryptedBlock<Cipher>::TryDecrypt(std::move(*block), _encKey));
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}
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template<class Cipher>
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void EncryptedBlockStore<Cipher>::remove(cpputils::unique_ref<Block> block) {
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auto encryptedBlock = cpputils::dynamic_pointer_move<EncryptedBlock<Cipher>>(block);
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assert(encryptedBlock != boost::none);
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auto baseBlock = (*encryptedBlock)->releaseBlock();
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return _baseBlockStore->remove(std::move(baseBlock));
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}
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template<class Cipher>
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uint64_t EncryptedBlockStore<Cipher>::numBlocks() const {
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return _baseBlockStore->numBlocks();
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}
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template<class Cipher>
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void EncryptedBlockStore<Cipher>::__setKey(const typename Cipher::EncryptionKey &encKey) {
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_encKey = encKey;
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}
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}
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}
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#endif
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