Program Listing for File lwe-pke.h

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#ifndef _LWE_PKE_H_
#define _LWE_PKE_H_

#include "binfhe-constants.h"
#include "lwe-ciphertext.h"
#include "lwe-keyswitchkey.h"
#include "lwe-privatekey.h"
#include "lwe-publickey.h"
#include "lwe-keypair.h"
#include "lwe-cryptoparameters.h"

#include <memory>

namespace lbcrypto {

class LWEEncryptionScheme {
    NativeInteger RoundqQ(const NativeInteger& v, const NativeInteger& q, const NativeInteger& Q) const;

public:
    LWEEncryptionScheme() = default;

    LWEPrivateKey KeyGen(usint size, const NativeInteger& modulus) const;

    LWEPrivateKey KeyGenGaussian(usint size, const NativeInteger& modulus) const;

    LWEKeyPair KeyGenPair(const std::shared_ptr<LWECryptoParams>& params) const;

    LWEPublicKey PubKeyGen(const std::shared_ptr<LWECryptoParams>& params, ConstLWEPrivateKey& skN) const;

    LWECiphertext Encrypt(const std::shared_ptr<LWECryptoParams>& params, ConstLWEPrivateKey& sk, LWEPlaintext m,
                          LWEPlaintextModulus p = 4, NativeInteger mod = 0) const;

    LWECiphertext EncryptN(const std::shared_ptr<LWECryptoParams>& params, ConstLWEPublicKey& pk, LWEPlaintext m,
                           LWEPlaintextModulus p = 4, NativeInteger mod = 0) const;

    LWECiphertext SwitchCTtoqn(const std::shared_ptr<LWECryptoParams>& params, ConstLWESwitchingKey& ksk,
                               ConstLWECiphertext& ct) const;

    void Decrypt(const std::shared_ptr<LWECryptoParams>& params, ConstLWEPrivateKey& sk, ConstLWECiphertext& ct,
                 LWEPlaintext* result, LWEPlaintextModulus p = 4) const;

    void EvalAddEq(LWECiphertext& ct1, ConstLWECiphertext& ct2) const;

    void EvalAddConstEq(LWECiphertext& ct, NativeInteger cnst) const;

    void EvalSubEq(LWECiphertext& ct1, ConstLWECiphertext& ct2) const;

    void EvalSubEq2(ConstLWECiphertext& ct1, LWECiphertext& ct2) const;

    void EvalSubConstEq(LWECiphertext& ct, NativeInteger cnst) const;

    void EvalMultConstEq(LWECiphertext& ct, NativeInteger cnst) const;

    LWECiphertext ModSwitch(NativeInteger q, ConstLWECiphertext& ctQ) const;

    LWESwitchingKey KeySwitchGen(const std::shared_ptr<LWECryptoParams>& params, ConstLWEPrivateKey& sk,
                                 ConstLWEPrivateKey& skN) const;

    LWECiphertext KeySwitch(const std::shared_ptr<LWECryptoParams>& params, ConstLWESwitchingKey& K,
                            ConstLWECiphertext& ctQN) const;

    LWECiphertext NoiselessEmbedding(const std::shared_ptr<LWECryptoParams>& params, LWEPlaintext m) const;
};

}  // namespace lbcrypto

#endif