fhipe.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_FHIPE_H
#define CIFER_FHIPE_H
 
#include "cifer/data/mat.h"
#include "cifer/data/vec_curve.h"
 
typedef struct cfe_fhipe {
    size_t l;
    mpz_t bound_x;
    mpz_t bound_y;
    mpz_t order;
} cfe_fhipe;
 
cfe_error cfe_fhipe_init(cfe_fhipe *c, size_t l, mpz_t bound_x, mpz_t bound_y);
 
void cfe_fhipe_copy(cfe_fhipe *res, cfe_fhipe *c);
 
void cfe_fhipe_free(cfe_fhipe *c);
 
typedef struct cfe_fhipe_sec_key {
    ECP_BN254 g1;
    ECP2_BN254 g2;
    cfe_mat B;
    cfe_mat B_star;
} cfe_fhipe_sec_key;
 
void cfe_fhipe_master_key_init(cfe_fhipe_sec_key *sec_key, cfe_fhipe *c);
 
void cfe_fhipe_master_key_free(cfe_fhipe_sec_key *sec_key);
 
cfe_error cfe_fhipe_generate_master_key(cfe_fhipe_sec_key *sec_key, cfe_fhipe *c);
 
typedef struct cfe_fhipe_fe_key {
    ECP_BN254 k1;
    cfe_vec_G1 k2;
} cfe_fhipe_fe_key;
 
void cfe_fhipe_fe_key_init(cfe_fhipe_fe_key *fe_key, cfe_fhipe *c);
 
void cfe_fhipe_fe_key_free(cfe_fhipe_fe_key *fe_key);
 
cfe_error cfe_fhipe_derive_fe_key(cfe_fhipe_fe_key *fe_key, cfe_vec *y,
                                  cfe_fhipe_sec_key *sec_key, cfe_fhipe *c);
 
typedef struct cfe_fhipe_ciphertext {
    ECP2_BN254 c1;
    cfe_vec_G2 c2;
} cfe_fhipe_ciphertext;
 
void cfe_fhipe_ciphertext_init(cfe_fhipe_ciphertext *cipher, cfe_fhipe *c);
 
void cfe_fhipe_ciphertext_free(cfe_fhipe_ciphertext *cipher);
 
cfe_error cfe_fhipe_encrypt(cfe_fhipe_ciphertext *cipher, cfe_vec *x,
                            cfe_fhipe_sec_key *sec_key, cfe_fhipe *c);
 
cfe_error cfe_fhipe_decrypt(mpz_t res, cfe_fhipe_ciphertext *cipher,
                            cfe_fhipe_fe_key *fe_key, cfe_fhipe *c);
 
#endif