secure_recommendations/server.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 SERVER_HEADER_GUARD
#define SERVER_HEADER_GUARD

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

#include "hub.h"
#include "secure_svm.h"
#include "test_data_row.h"

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

namespace SeComLib {
using namespace Core;

namespace SecureRecommendations {
    //forward-declare required classes
    class Hub;

    //we need a reference to the Server object in the SecureSvm instances, so we make use of shared_from_this() when instantiating SecureSvm
    class Server : public std::enable_shared_from_this<Server> {
    public:
        typedef std::vector<Paillier::Ciphertext> EncryptedSvmValues;

        typedef std::vector<Paillier::Ciphertext> EncryptedClusterVotes;

        Server (const PaillierPublicKey &key);

        ~Server () {}

        void SetClient (const std::shared_ptr<const Hub> &client);

        void Initialize ();

        void InteractiveSecureDivision (const BigInteger &numerator, SecureSvm::EncryptedVector &denominators) const;

        void GetAccuracyPredictions (Server::EncryptedClusterVotes &clusterVotes, SecureSvm::EncryptedVector &safetyPredictions, const TestDataRow &medicalRelevanceTestData, const std::map<std::string, TestDataRow> &safetyTestData) const;

        void GetPerformancePredictions (SecureSvm::EncryptedVector &firstTwoBlocksPredictions, SecureSvm::EncryptedVector &SafetyBlockPredictions, const TestDataRow &medicalRelevanceTestData, const std::map<std::string, TestDataRow> &safetyTestData) const;

        std::vector<std::string> GetSafetyBlockSvmsUnsafeClasses () const;

        std::deque<std::string> GetSafetyBlockModelFiles () const;

        void DebugValue (const Paillier::Ciphertext &value) const;

    private:
        typedef std::vector<std::pair<size_t, size_t>> PermutationVector;

        std::weak_ptr<const Hub> client;

        Paillier cryptoProvider;
        
        PaillierPublicKey clientPublicKey;

        SecureSvm::KernelTypes kernel;

        unsigned int contentItemCount;

        std::vector<BigInteger> dummyContentItems;

        std::vector<Paillier::Ciphertext> dummyEncryptedPreferenceScores;

        unsigned int blindingFactorSize;

        std::string modelFileExtension;

        std::string medicalRelevanceModelsDirectory;

        std::string safetyModelsDirectory;

        std::deque<std::string> safetySvmModelFiles;

        std::vector<std::unique_ptr<SecureSvm>> medicalRelevanceSvms;

        std::vector<std::unique_ptr<SecureSvm>> safetySvms;

        unsigned int medicalRelevanceClusterCount;

        Server::EncryptedClusterVotes encryptedClusterVotes;

        Paillier::Ciphertext encryptedZero;

        Paillier::Ciphertext encryptedOne;

        void loadMedicalRelevanceSvmModels (const std::string &modelsDirectory);

        void loadSafetySvmModels (const std::string &modelsDirectory);

        Server::EncryptedClusterVotes getTotalClusterVotes (Server::EncryptedSvmValues &votes) const;

        void interactiveSignEvaluation (Server::EncryptedSvmValues &data) const;

        void interactiveMaximumEvaluation (Server::EncryptedClusterVotes &data) const;

        Server (Server const &);

        Server operator= (Server const &);
    };
}//namespace SecureRecommendations
}//namespace SeComLib

#endif//SERVER_HEADER_GUARD