/**
\file powmod.h
\author daniel.demmler@ec-spride.de
\copyright ABY - A Framework for Efficient Mixed-protocol Secure Two-party Computation
Copyright (C) 2019 ENCRYPTO Group, TU Darmstadt
This program is free software: you can redistribute it and/or modify
it under the terms of 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.
ABY 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 .
\brief Powmod Implementation
*/
#ifndef _POWMOD_H_
#define _POWMOD_H_
#include
extern mpz_t* m_table_g;
extern mpz_t* m_table_h;
extern mpz_t* m_prod;
extern mpz_t m_mod;
extern size_t m_numberOfElements_g;
extern size_t m_numberOfElements_h;
/**
* initialize fixed base multiplication for a given base and a desired exponent bit size
* identical functionality for either g or h
*/
void fbpowmod_init_g(const mpz_t base, const mpz_t mod, size_t bitsize);
void fbpowmod_init_h(const mpz_t base, const mpz_t mod, size_t bitsize);
/**
* fixed-base multiplication
* requires pre-computed table, created with fbpowmod_init_*
*/
void fbpowmod_g(mpz_t result, const mpz_t exp);
void fbpowmod_h(mpz_t result, const mpz_t exp);
/**
* fixed-base double base encryption
* requires pre-computed product with fbdbpowmod_init
*/
void fbdbpowmod(mpz_t ret, const mpz_t e1, const mpz_t e2);
void fbdbpowmod_init(const mpz_t b1, const mpz_t b2, const mpz_t mod, size_t bitsize);
/**
* double-base exponentiation ret = b1^e1*b2^e2
*/
void dbpowmod(mpz_t ret, const mpz_t b1, const mpz_t e1, const mpz_t b2, const mpz_t e2, const mpz_t mod);
#endif