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/* $OpenBSD: dh.c,v 1.7 2002/06/09 08:13:06 todd Exp $ */
/* $EOM: dh.c,v 1.5 1999/04/17 23:20:22 niklas Exp $ */
/*
* Copyright (c) 1998 Niels Provos. All rights reserved.
* Copyright (c) 1999 Niklas Hallqvist. 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 Ericsson Radio Systems.
* 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.
*/
/*
* This code was written under funding by Ericsson Radio Systems.
*/
#include <sys/param.h>
#include "sysdep.h"
#include "math_group.h"
#include "dh.h"
#include "log.h"
/*
* Returns the length of our exchange value.
*/
int
dh_getlen (struct group *group)
{
return group->getlen (group);
}
/*
* Creates the exchange value we are offering to the other party.
* Each time this function is called a new value is created, that
* means the application has to save the exchange value itself,
* dh_create_exchange should only be called once.
*/
int
dh_create_exchange (struct group *group, u_int8_t *buf)
{
if (group->setrandom (group, group->c))
return -1;
if (group->operation (group, group->a, group->gen, group->c))
return -1;
group->getraw (group, group->a, buf);
return 0;
}
/*
* Creates the Diffie-Hellman shared secret in 'secret', where 'exchange'
* is the exchange value offered by the other party. No length verification
* is done for the value, the application has to do that.
*/
int
dh_create_shared (struct group *group, u_int8_t *secret, u_int8_t *exchange)
{
if (group->setraw (group, group->b, exchange, group->getlen (group)))
return -1;
if (group->operation (group, group->a, group->b, group->c))
return -1;
group->getraw (group, group->a, secret);
return 0;
}
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