rlwe.h

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.

#pragma once

#include "seal/ciphertext.h"
#include "seal/context.h"
#include "seal/encryptionparams.h"
#include "seal/publickey.h"
#include "seal/randomgen.h"
#include "seal/secretkey.h"
#include <cstdint>

namespace seal
{
    namespace util
    {
        /**
        Generate a ternary polynomial uniformlly and store in RNS representation.

        @param[in] rng A uniform random generator.
        @param[in] parms EncryptionParameters used to parametize an RNS polynomial.
        @param[out] destination Allocated space to store a random polynomia.
        */
        void sample_poly_ternary(
            std::shared_ptr<UniformRandomGenerator> rng, const EncryptionParameters &parms, std::uint64_t *destination);

        /**
        Generate a polynomial from a normal distribution and store in RNS representation.

        @param[in] rng A uniform random generator.
        @param[in] parms EncryptionParameters used to parametize an RNS polynomial.
        @param[out] destination Allocated space to store a random polynomia.
        */
        void sample_poly_normal(
            std::shared_ptr<UniformRandomGenerator> rng, const EncryptionParameters &parms, std::uint64_t *destination);

        /**
        Generate a polynomial uniformly from Rq and store in RNS representation.

        @param[in] rng A uniform random generator.
        @param[in] parms EncryptionParameters used to parametize an RNS polynomial.
        @param[out] destination Allocated space to store a random polynomia.
        */
        void sample_poly_uniform(
            std::shared_ptr<UniformRandomGenerator> rng, const EncryptionParameters &parms, std::uint64_t *destination);

        /**
        Create an encryption of zero with a public key and store in a ciphertext.

        @param[in] public_key The public key used for encryption.
        @param[in] context The SEALContext containing a chain of ContextData.
        @param[in] parms_id Indicates the level of encryption.
        @param[in] is_ntt_form If true, store Ciphertext in NTT form.
        @param[out] destination The output ciphertext - an encryption of zero.
        */
        void encrypt_zero_asymmetric(
            const PublicKey &public_key, std::shared_ptr<SEALContext> context, parms_id_type parms_id, bool is_ntt_form,
            Ciphertext &destination);

        /**
        Create an encryption of zero with a secret key and store in a ciphertext.

        @param[out] destination The output ciphertext - an encryption of zero.
        @param[in] secret_key The secret key used for encryption.
        @param[in] context The SEALContext containing a chain of ContextData.
        @param[in] parms_id Indicates the level of encryption.
        @param[in] is_ntt_form If true, store Ciphertext in NTT form.
        @param[in] save_seed If true, The second component of ciphertext is
        replaced with the random seed used to sample this component.
        */
        void encrypt_zero_symmetric(
            const SecretKey &secret_key, std::shared_ptr<SEALContext> context, parms_id_type parms_id, bool is_ntt_form,
            bool save_seed, Ciphertext &destination);
    } // namespace util
} // namespace seal