powmod.h File Reference

Powmod Implementation. More...

#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>

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Functions
void	fbpowmod_init_g (const mpz_t base, const mpz_t mod, const int bitsize)
void	fbpowmod_init_h (const mpz_t base, const mpz_t mod, const int bitsize)
void	fbpowmod_g (mpz_t result, const mpz_t exp)
void	fbpowmod_h (mpz_t result, const mpz_t exp)
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, const int bitsize)
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)

Variables
mpz_t *	m_table_g
mpz_t *	m_table_h
mpz_t *	m_prod
mpz_t	m_mod
int	m_numberOfElements_g
int	m_numberOfElements_h

Detailed Description

Powmod Implementation.

Author

danie.nosp@m.l.de.nosp@m.mmler.nosp@m.@ec-.nosp@m.sprid.nosp@m.e.de

Copyright

ABY - A Framework for Efficient Mixed-protocol Secure Two-party Computation Copyright (C) 2015 Engineering Cryptographic Protocols Group, TU Darmstadt This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. 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 Affero General Public License for more details. You should have received a copy of the GNU Affero General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Function Documentation

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
	)

double-base exponentiation ret = b1^e1*b2^e2

void fbdbpowmod	(	mpz_t	ret,
		const mpz_t	e1,
		const mpz_t	e2
	)

fixed-base double base encryption requires pre-computed product with fbdbpowmod_init

void fbpowmod_g	(	mpz_t	result,
		const mpz_t	exp
	)

fixed-base multiplication requires pre-computed table, created with fbpowmod_init_*

void fbpowmod_init_g	(	const mpz_t	base,
		const mpz_t	mod,
		const int	bitsize
	)

initialize fixed base multiplication for a given base and a desired exponent bit size identical functionality for either g or h