ddh.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_DDH_H
#define CIFER_DDH_H
 
#include "cifer/data/vec.h"
#include "cifer/internal/errors.h"
 
typedef struct cfe_ddh {
    size_t l;
    mpz_t bound;
    mpz_t g;
    mpz_t p;
    mpz_t q;
} cfe_ddh;
 
cfe_error cfe_ddh_init(cfe_ddh *s, size_t l, size_t modulus_len, mpz_t bound);
 
cfe_error cfe_ddh_precomp_init(cfe_ddh *s, size_t l, size_t modulus_len, mpz_t bound);
 
void cfe_ddh_free(cfe_ddh *s);
 
void cfe_ddh_copy(cfe_ddh *res, cfe_ddh *s);
 
void cfe_ddh_master_keys_init(cfe_vec *msk, cfe_vec *mpk, cfe_ddh *s);
 
void cfe_ddh_ciphertext_init(cfe_vec *ciphertext, cfe_ddh *s);
 
void cfe_ddh_generate_master_keys(cfe_vec *msk, cfe_vec *mpk, cfe_ddh *s);
 
cfe_error cfe_ddh_derive_fe_key(mpz_t res, cfe_ddh *s, cfe_vec *msk, cfe_vec *y);
 
cfe_error cfe_ddh_encrypt(cfe_vec *ciphertext, cfe_ddh *s, cfe_vec *x, cfe_vec *mpk);
 
cfe_error cfe_ddh_decrypt(mpz_t res, cfe_ddh *s, cfe_vec *ciphertext, mpz_t key, cfe_vec *y);
 
#endif