Program Listing for File rlwe-mp.h

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//==================================================================================
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// Copyright (c) 2014-2025, NJIT, Duality Technologies Inc. and other contributors
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#ifndef __RLWE_MP_H_
#define __RLWE_MP_H_

#include "ciphertext-fwd.h"
#include "cryptocontext-fwd.h"
#include "key/keypair.h"
#include "openfhecore.h"

#include <memory>
#include <vector>

namespace lbcrypto {

class SchemeletRLWEMP {
    using DggType = typename DCRTPoly::DggType;
    using DugType = typename DCRTPoly::DugType;

public:
    ~SchemeletRLWEMP() = default;

    static std::shared_ptr<ILDCRTParams<DCRTPoly::Integer>> GetElementParams(const PrivateKey<DCRTPoly>& privateKey,
                                                                             uint32_t level = 0);

    static std::vector<Poly> EncryptCoeff(std::vector<int64_t> input, const BigInteger& Q, const BigInteger& p,
                                          const PrivateKey<DCRTPoly>& privateKey,
                                          const std::shared_ptr<ILDCRTParams<DCRTPoly::Integer>>& elementParams,
                                          bool bitReverse = false);

    static std::vector<int64_t> DecryptCoeff(const std::vector<Poly>& input, const BigInteger& Q, const BigInteger& p,
                                             const PrivateKey<DCRTPoly>& privateKey,
                                             const std::shared_ptr<ILDCRTParams<DCRTPoly::Integer>>& elementParams,
                                             uint32_t numSlots, uint32_t length = 0, bool bitReverse = false);

    static void ModSwitch(std::vector<Poly>& input, const BigInteger& Q1, const BigInteger& Q2);

    static Ciphertext<DCRTPoly> ConvertRLWEToCKKS(const CryptoContextImpl<DCRTPoly>& cc,
                                                  const std::vector<Poly>& coeffs, const PublicKey<DCRTPoly>& pubKey,
                                                  const BigInteger& Bigq, uint32_t slots, uint32_t level = 0);

    static std::vector<Poly> ConvertCKKSToRLWE(ConstCiphertext<DCRTPoly>& ctxt, const BigInteger& Q);

    static BigInteger GetQPrime(const PublicKey<DCRTPoly>& pubKey, uint32_t lvls);
};

}  // namespace lbcrypto

#endif  // __RLWE_MP_H_