private_recommendations_data_packing/client.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 CLIENT_HEADER_GUARD
#define CLIENT_HEADER_GUARD

//include our headers
#include "utils/config.h"
#include "utils/date_time.h"
#include "utils/cpu_timer.h"
#include "core/paillier.h"
#include "core/randomizer_cache.h"
#include "core/blinding_factor_cache_parameters.h"

#include "private_recommendations_utils/decryption_blinding_factor_container.h"
#include "service_provider.h"
#include "privacy_service_provider.h"

//include C++ libraries
#include <fstream>
#include <string>
#include <sstream>
#include <deque>
#include <stdexcept>

namespace SeComLib {
using namespace Core;
using namespace PrivateRecommendationsUtils;

//hackish way of computing everything for only a single user (see also service_provider.h)
#define FIRST_USER_ONLY

namespace PrivateRecommendationsDataPacking {
    class Client {
    public:

        Client (const std::shared_ptr<ServiceProvider> &serviceProvider, const std::shared_ptr<PrivacyServiceProvider> &privacyServiceProvider, const PaillierPublicKey &publicKey);

        ~Client () {}

        const ServiceProvider::EncryptedUserDataContainer &GetNormalizedScaledRatings () const;

        const ServiceProvider::PackedItems &GetSparseRatings () const;

        void ComputeRecommendations ();

    private:
        typedef DecryptionBlindingFactorContainer<Paillier, BlindingFactorCacheParameters> BlindingFactorContainer;

        const std::shared_ptr<ServiceProvider> serviceProvider;

        const std::shared_ptr<PrivacyServiceProvider> privacyServiceProvider;

        Paillier paillierCryptoProvider;

        static const std::string configurationPath;

        size_t userCount;

        size_t itemCount;

        size_t denselyRatedItemCount;

        size_t ratingBitSize;

        size_t scaledNormalizedRatingBitSize;

        unsigned int digitsToPreserve;

        size_t kappa;

        size_t hatL;

        std::deque<BigInteger> emptyBuckets;

        std::string ratingsFilePath;

        ServiceProvider::EncryptedUserDataContainer normalizedScaledRatings;

        std::deque<std::deque<unsigned long>> plaintextSparseRatings;

        ServiceProvider::PackedItems sparseRatings;

        RandomizerCache<BlindingFactorContainer> LdecryptionBlindingFactorCache;

        RandomizerCache<BlindingFactorContainer> URSumDecryptionBlindingFactorCache;

        std::deque<BigInteger> computeEmptyBuckets (const size_t L) const;

        ServiceProvider::PackedData packUserSparseRatings (const std::deque<unsigned long> &userPlaintextSparseRatings, const std::deque<BigInteger> &userEmptyBuckets) const;

        Client (Client const &);

        Client operator= (Client const &);
    };
}//namespace PrivateRecommendationsDataPacking
}//namespace SeComLib

#endif//CLIENT_HEADER_GUARD