damgard_dec_multi.h

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/*
 * Copyright (c) 2018 XLAB d.o.o.
 *
 * 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 CIFER_DAMGARD_DEC_MULTI_H
#define CIFER_DAMGARD_DEC_MULTI_H
 
#include "cifer/data/vec.h"
#include "cifer/internal/errors.h"
#include "cifer/innerprod/fullysec/damgard_multi.h"
 
typedef struct cfe_damgard_dec_multi_client {
    size_t idx;
    cfe_damgard_multi scheme;
    mpz_t client_pub_key;
    mpz_t client_sec_key;
    cfe_mat share;
} cfe_damgard_dec_multi_client;
 
typedef struct cfe_damgard_dec_multi_dec {
    cfe_damgard_multi scheme;
} cfe_damgard_dec_multi_dec;
 
typedef struct cfe_damgard_dec_multi_sec_key {
    cfe_damgard_sec_key dam_sec_key;
    cfe_vec dam_pub_key;
    cfe_vec otp_key;
} cfe_damgard_dec_multi_sec_key;
 
typedef struct cfe_damgard_dec_multi_fe_key_part {
    cfe_damgard_fe_key key_part;
    mpz_t otp_key_part;
} cfe_damgard_dec_multi_fe_key_part;
 
void cfe_damgard_dec_multi_client_init(cfe_damgard_dec_multi_client *c,
                                       cfe_damgard_multi *damgard_multi, size_t idx);
 
void cfe_damgard_dec_multi_client_free(cfe_damgard_dec_multi_client *c);
 
void cfe_damgard_dec_multi_client_set_share(cfe_damgard_dec_multi_client *c,
                                            mpz_t *pub_keys);
 
void cfe_damgard_dec_multi_sec_key_init(cfe_damgard_dec_multi_sec_key *sec_key,
                                        cfe_damgard_dec_multi_client *c);
 
void cfe_damgard_dec_multi_sec_key_free(cfe_damgard_dec_multi_sec_key *sec_key);
 
void cfe_damgard_dec_multi_generate_keys(cfe_damgard_dec_multi_sec_key *sec_key,
                                         cfe_damgard_dec_multi_client *c);
 
void cfe_damgard_dec_multi_ciphertext_init(cfe_vec *ciphertext,
                                           cfe_damgard_dec_multi_client *c);
 
cfe_error cfe_damgard_dec_multi_encrypt(cfe_vec *cipher, cfe_vec *x,
                                        cfe_damgard_dec_multi_sec_key *sec_key,
                                        cfe_damgard_dec_multi_client *c);
 
void cfe_damgard_dec_multi_fe_key_share_init(cfe_damgard_dec_multi_fe_key_part *fe_key_part);
 
void cfe_damgard_dec_multi_fe_key_free(cfe_damgard_dec_multi_fe_key_part *fe_key_part);
 
cfe_error cfe_damgard_dec_multi_client_derive_fe_key_part(cfe_damgard_dec_multi_fe_key_part *fe_key_part,
                                                          cfe_mat *y, cfe_damgard_dec_multi_sec_key *sec_key,
                                                          cfe_damgard_dec_multi_client *c);
 
void cfe_damgard_dec_multi_dec_init(cfe_damgard_dec_multi_dec *d,
                                    cfe_damgard_multi *damgard_multi);
 
void cfe_damgard_dec_multi_dec_free(cfe_damgard_dec_multi_dec *d);
 
cfe_error cfe_damgard_dec_multi_decrypt(mpz_t res, cfe_vec *ciphers,
                                        cfe_damgard_dec_multi_fe_key_part *fe_key_parts, cfe_mat *y,
                                        cfe_damgard_dec_multi_dec *d);
 
#endif