libcryfs/implementations/encrypted/EncryptedBlock.h

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#pragma once
#ifndef BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_ENCRYPTEDBLOCK_H_
#define BLOCKSTORE_IMPLEMENTATIONS_ENCRYPTED_ENCRYPTEDBLOCK_H_
#include "../../interface/Block.h"
#include "EncryptionKey.h"
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#include "../../utils/Data.h"
#include "../../interface/BlockStore.h"
#include "messmer/cpp-utils/macros.h"
#include <memory>
namespace blockstore {
namespace encrypted {
class EncryptedBlockStore;
class EncryptedBlock: public Block {
public:
//TODO Storing key twice (in parent class and in object pointed to). Once would be enough.
EncryptedBlock(std::unique_ptr<Block> baseBlock, const EncryptionKey &encKey);
EncryptedBlock(std::unique_ptr<Block> baseBlock, const EncryptionKey &encKey, Data plaintextData);
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virtual ~EncryptedBlock();
static std::unique_ptr<EncryptedBlock> TryCreateNew(BlockStore *baseBlockStore, const Key &key, Data data, const EncryptionKey &encKey);
const void *data() const override;
void write(const void *source, uint64_t offset, uint64_t size) override;
void flush() override;
size_t size() const override;
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static constexpr unsigned int BASE_BLOCK_SIZE(unsigned int useableBlockSize) {
return useableBlockSize + IV_SIZE;
}
static constexpr unsigned int USEABLE_BLOCK_SIZE(unsigned int baseBlockSize) {
return baseBlockSize - IV_SIZE;
}
private:
std::unique_ptr<Block> _baseBlock;
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Data _plaintextData;
EncryptionKey _encKey;
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bool _dataChanged;
static constexpr unsigned int IV_SIZE = CryptoPP::AES::BLOCKSIZE;
byte *baseBlockIV();
byte *baseBlockData();
void _encryptToBaseBlock();
void _decryptFromBaseBlock();
static Data _encrypt(const Data &plaintext, const EncryptionKey &encKey);
DISALLOW_COPY_AND_ASSIGN(EncryptedBlock);
};
}
}
#endif