CollectiveKeyGenerator.hpp

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//                                                                            //
// Copyright (C) 2021-2023 Crypto Lab Inc.                                    //
//                                                                            //
// - This file is part of HEaaN homomorphic encryption library.               //
// - HEaaN cannot be copied and/or distributed without the express permission //
//  of Crypto Lab Inc.                                                        //
//                                                                            //
 
#pragma once
 
#include "HEaaN/Context.hpp"
#include "HEaaN/HEaaNExport.hpp"
 
#include "HEaaN/multiparty/CollectiveKeyGenConfig.hpp"
#include "HEaaN/multiparty/CollectiveKeyGenData.hpp"
 
#include <memory>
 
namespace HEaaN {
 
class CollectiveKeyGeneratorImpl;
class SecretKey;
class KeyPack;
class EncryptionKey;
class EvaluationKey;
class SparseSecretEncapsulationKey;
 
class HEAAN_API CollectiveKeyGenerator {
public:
    explicit CollectiveKeyGenerator(const Context &context);
 
    explicit CollectiveKeyGenerator(const Context &context,
                                    const Context &context_sparse);
 
    CollectiveKeyGenData
    genCommonRandomData(const CollectiveKeyGenConfig &config) const;
 
    CollectiveKeyGenData genKeyShare(const SecretKey &sk,
                                     const CollectiveKeyGenData &crd) const;
 
    CollectiveKeyGenData aggregateKeyShare(
        const std::vector<const CollectiveKeyGenData *> &parts) const;
 
    CollectiveKeyGenData
    genMultKeyShareRoundOne(const SecretKey &sk, const SecretKey &tmp_sk,
                            const CollectiveKeyGenData &crd) const;
 
    CollectiveKeyGenData
    genMultKeyShareRoundTwo(const SecretKey &sk, const SecretKey &tmp_sk,
                            const CollectiveKeyGenData &data_round_one) const;
 
    std::shared_ptr<EncryptionKey>
    genEncKey(const CollectiveKeyGenData &crd,
              const CollectiveKeyGenData &agg) const;
 
    std::shared_ptr<EvaluationKey>
    genConjKey(const CollectiveKeyGenData &crd,
               const CollectiveKeyGenData &agg) const;
 
    std::shared_ptr<EvaluationKey>
    genRotKey(const CollectiveKeyGenData &crd,
              const CollectiveKeyGenData &agg) const;
 
    std::shared_ptr<EvaluationKey>
    genMultKey(const CollectiveKeyGenData &data_round_one,
               const CollectiveKeyGenData &data_round_two) const;
 
    std::shared_ptr<SparseSecretEncapsulationKey>
    genSparseSecretEncapsulationKey(const CollectiveKeyGenData &crd,
                                    const CollectiveKeyGenData &agg) const;
 
private:
    std::shared_ptr<CollectiveKeyGeneratorImpl> impl_;
};
} // namespace HEaaN