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/*
* 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.
*/
/*
* photuris_spi_needed:
*
*/
#ifndef lint
static char rcsid[] = "$Id: photuris_spi_needed.c,v 1.1 1997/07/18 22:48:49 provos Exp $";
#endif
#include <stdio.h>
#include <string.h>
#include "config.h"
#include "packets.h"
#include "state.h"
#include "validity.h"
#include "encrypt.h"
int
photuris_spi_needed(struct stateob *st, u_char *buffer, int *size,
u_int8_t *attributes, u_int16_t attribsize)
{
struct spi_needed *header;
u_int16_t rsize, asize, tmp;
u_int8_t *p;
rsize = *size;
if (rsize < SPI_NEEDED_MIN)
return -1; /* buffer not large enough */
asize = SPI_NEEDED_MIN; /* Actual size */
rsize -= asize; /* Remaining size */
header = (struct spi_needed *) buffer;
header->type = SPI_NEEDED;
bzero(header->reserved, sizeof(header->reserved));
/* Copy the cookies */
bcopy(st->icookie, header->icookie, COOKIE_SIZE);
bcopy(st->rcookie, header->rcookie, COOKIE_SIZE);
p = SPI_NEEDED_VERIFICATION(header);
/* Leave space for verification data */
tmp = get_validity_verification_size(st);
if (rsize < tmp)
return -1; /* buffer not large enough */
p += tmp; asize += tmp; rsize -= tmp;
if (rsize < attribsize)
return -1; /* buffer not large enough */
/* Copy attributes and padding */
bcopy(attributes, p, attribsize);
asize += attribsize;
rsize -= attribsize;
p += attribsize;
tmp = rsize;
if(packet_create_padding(st, asize - SPI_NEEDED_MIN, p, &tmp) == -1)
return -1;
p += tmp; asize += tmp; rsize -= tmp;
/* Create verification data */
create_validity_verification(st,SPI_UPDATE_VERIFICATION(header),
(u_int8_t *)header,asize);
/* Encrypt the packet after header if wished for */
packet_encrypt(st, SPI_NEEDED_VERIFICATION(header),
asize - SPI_NEEDED_MIN);
*size = asize;
return 0;
}
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