private_recommendations_utils/dgk_comparison_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 DGK_COMPARISON_CLIENT_HEADER_GUARD
#define DGK_COMPARISON_CLIENT_HEADER_GUARD

//include our headers
#include "utils/config.h"
#include "core/big_integer.h"
#include "core/random_provider.h"
#include "core/paillier.h"
#include "core/dgk.h"

namespace SeComLib {
using namespace Core;

namespace PrivateRecommendationsUtils {
    //forward-declare required classes
    class DgkComparisonServer;

    class DgkComparisonClient {
    public:
        DgkComparisonClient (const Paillier &paillierCryptoProvider, const Dgk &dgkCryptoProvider);

        ~DgkComparisonClient () {}

        void SetZModTwoPowL (const BigInteger &zModTwoPowL);
        
        Dgk::Ciphertext GetTb (const Dgk::Ciphertext &tau, const size_t i) const;

        Dgk::Ciphertext GetBi (const size_t i) const;

        Paillier::Ciphertext ConvertToPaillier (const Dgk::Ciphertext &dgkCiphertext) const;

        Paillier::Ciphertext ComputeDiPSP (const Dgk::Ciphertext &CiPSP) const;

        void SetServer (const std::shared_ptr<DgkComparisonServer> &dgkComparisonServer);

        void DebugDgkEncryption (const Dgk::Ciphertext &input) const;

    private:
        const Paillier &paillierCryptoProvider;

        const Dgk &dgkCryptoProvider;

        BigInteger b;

        std::shared_ptr<const DgkComparisonServer> dgkComparisonServer;

        DgkComparisonClient (DgkComparisonClient const &);

        DgkComparisonClient operator= (DgkComparisonClient const &);
    };
}//namespace PrivateRecommendationsUtils
}//namespace SeComLib

#endif//DGK_COMPARISON_CLIENT_HEADER_GUARD