sgp.h

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/* *
 * Copyright (C) 2018 XLAB d.o.o.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of either:
 *
 *     * the GNU Lesser General Public License as published by the Free
 *     Software Foundation; either version 3 of the License, or (at your
 *     option) any later version.
 *
 * or
 *
 *     * the GNU General Public License as published by the Free Software
 *     Foundation; either version 2 of the License, or (at your option) any
 *     later version.
 *
 * or both in parallel, as here.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef CIFER_SGP_H
#define CIFER_SGP_H
 
#include "cifer/data/vec.h"
#include "cifer/internal/errors.h"
#include "cifer/data/vec_curve.h"
 
typedef struct cfe_sgp {
    size_t l;
    mpz_t bound;
    mpz_t mod;
    BIG_256_56 mod_big;
} cfe_sgp;
 
typedef struct cfe_sgp_sec_key {
    cfe_vec s;
    cfe_vec t;
} cfe_sgp_sec_key;
 
typedef struct cfe_sgp_cipher {
    ECP_BN254 g1MulGamma;
    cfe_vec_G1 *a;
    cfe_vec_G2 *b;
    size_t l;
} cfe_sgp_cipher;
 
cfe_error cfe_sgp_init(cfe_sgp *s, size_t l, mpz_t bound);
 
void cfe_sgp_free(cfe_sgp *s);
 
void cfe_sgp_sec_key_init(cfe_sgp_sec_key *msk, cfe_sgp *sgp);
 
void cfe_sgp_sec_key_free(cfe_sgp_sec_key *msk);
 
void cfe_sgp_generate_sec_key(cfe_sgp_sec_key *msk, cfe_sgp *s);
 
cfe_error cfe_sgp_derive_fe_key(ECP2_BN254 *key, cfe_sgp *sgp, cfe_sgp_sec_key *msk, cfe_mat *f);
 
void cfe_sgp_cipher_init(cfe_sgp_cipher *cipher, cfe_sgp *s);
 
void cfe_sgp_cipher_free(cfe_sgp_cipher *cipher);
 
cfe_error cfe_sgp_encrypt(cfe_sgp_cipher *cipher, cfe_sgp *s, cfe_vec *x, cfe_vec *y, cfe_sgp_sec_key *msk);
 
cfe_error cfe_sgp_decrypt(mpz_t res, cfe_sgp *s, cfe_sgp_cipher *cipher, ECP2_BN254 *key, cfe_mat *f);
 
#endif