data_packer.h

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/*
SeComLib
Copyright 2012-2013 TU Delft, Information Security & Privacy Lab (http://isplab.tudelft.nl/)

Contributors:
Inald Lagendijk (R.L.Lagendijk@TUDelft.nl)
Mihai Todor (todormihai@gmail.com)
Thijs Veugen (P.J.M.Veugen@tudelft.nl)
Zekeriya Erkin (z.erkin@tudelft.nl)

Licensed 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.
*/
#ifndef DATA_PACKER_HEADER_GUARD
#define DATA_PACKER_HEADER_GUARD

#include "utils/config.h"

//include C++ headers
#include <deque>
#include <stdexcept>

namespace SeComLib {
namespace Core {
    template <typename T_CryptoProvider>
    class DataPacker {
    public:

        struct DataBucket {
        public:
            BigInteger frontPadding;

            BigInteger data;

            BigInteger backPadding;
        };

        typedef std::deque<typename DataPacker<T_CryptoProvider>::DataBucket> UnpackedData;

        typedef std::deque<typename T_CryptoProvider::Ciphertext> PackedData;

        DataPacker (const T_CryptoProvider &cryptoProvider, const size_t dataSize, const size_t frontPaddingSize = 0, const size_t backPaddingSize = 0);

        ~DataPacker () {}

        PackedData Pack (const UnpackedData &input) const;

        UnpackedData Unpack (const PackedData &input, const size_t totalBucketCount) const;

        PackedData HomomorphicAdd (const PackedData &lhs, const PackedData &rhs);

        PackedData HomomorphicMultiply (const PackedData &lhs, const BigInteger &rhs);

    private:
        const T_CryptoProvider &cryptoProvider;

        size_t frontPaddingSize;

        BigInteger frontPaddingMessageSpace;
        
        size_t dataSize;

        BigInteger dataMessageSpace;

        size_t backPaddingSize;

        BigInteger backPaddingMessageSpace;

        size_t bucketSize;

        size_t bucketsPerEncryption;

        void initialize ();

        DataPacker (DataPacker const &);

        DataPacker operator= (DataPacker const &);
    };
}//namespace Core
}//namespace SeComLib

//Separate the implementation from the declaration of template methods
#include "data_packer.hpp"

#endif//DATA_PACKER_HEADER_GUARD