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/* elgamal.h
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG is free software; you can redistribute it and/or modify
* it under the terms of 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.
*
* GNUPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifndef G10_ELGAMAL_H
#define G10_ELGAMAL_H
#include "mpi.h"
typedef struct {
MPI p; /* prime */
MPI g; /* group generator */
MPI y; /* g^x mod p */
} ELG_public_key;
typedef struct {
MPI p; /* prime */
MPI g; /* group generator */
MPI y; /* g^x mod p */
MPI x; /* secret exponent */
} ELG_secret_key;
void elg_free_public_key( ELG_public_key *pk );
void elg_free_secret_key( ELG_secret_key *sk );
void elg_generate( ELG_public_key *pk, ELG_secret_key *sk,
unsigned nbits, MPI **factors );
int elg_check_secret_key( ELG_secret_key *sk );
void elg_encrypt(MPI a, MPI b, MPI input, ELG_public_key *pkey );
void elg_decrypt(MPI output, MPI a, MPI b, ELG_secret_key *skey );
void elg_sign(MPI a, MPI b, MPI input, ELG_secret_key *skey);
int elg_verify(MPI a, MPI b, MPI input, ELG_public_key *pkey);
#endif /*G10_ELGAMAL_H*/
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