/*
 * Copyright 1997 Niels Provos <provos@physnet.uni-hamburg.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Niels Provos.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/* $Id: modulus.h,v 1.1 1998/11/14 23:37:25 deraadt Exp $ */
/* 
 * modulus.h: 
 * modulus handling functions
 */ 

#ifndef _MODULUS_H_
#define _MODULUS_H_

#undef EXTERN

#ifdef _MODULUS_C_
#define EXTERN
#else
#define EXTERN extern
#endif

#include "gmp.h"

/* Possible values for the status field */

#define MOD_UNUSED     0
#define MOD_COMPUTING  1
#define MOD_PRIME      2
#define MOD_NOTPRIME   3

#define MOD_PRIME_ITER 5                    /* Do each cycle */
#define MOD_PRIME_MAX  20                   /* > => Is prime */
#define MOD_PRIME_TIME 4                    /* max time in mod_check_prime */

#define MOD_TIMEOUT    120

struct moduli_cache {
     struct moduli_cache *next;             /* Link to next member */
     mpz_t modulus;                         /* Modulus for computation */
     mpz_t generator;                       /* Used generator */
     mpz_t private_value;                   /* Our own private value */
     u_int8_t *exchangevalue;               /* Our own exchange value */
     u_int16_t exchangesize;
     int iterations;                        /* primality check iterations */
     int status;                            /* Status of the modulus */
     time_t lifetime;                       /* For modulus + exchange value */
};

/* Prototypes */
int mod_insert(struct moduli_cache *ob);
int mod_unlink(struct moduli_cache *ob);

struct moduli_cache *mod_new_modgen(mpz_t m, mpz_t g);
struct moduli_cache *mod_new_modulus(mpz_t m);

int mod_value_reset(struct moduli_cache *ob);

struct moduli_cache *mod_find_modgen(mpz_t modulus, mpz_t generator);
struct moduli_cache *mod_find_modgen_next(struct moduli_cache *ob, mpz_t modulus, mpz_t generator);
struct moduli_cache *mod_find_modulus(mpz_t modulus);
struct moduli_cache *mod_find_generator(mpz_t generator);
struct moduli_cache *mod_find_modulus_next(struct moduli_cache *ob, mpz_t modulus);
struct moduli_cache *mod_find_generator_next(struct moduli_cache *ob, mpz_t generator);

void mod_check_prime(int iter, int tm);

void mod_cleanup(void);


#endif