/* * Copyright 1997-2000 Niels Provos * 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 1.2 2000/12/15 02:50:39 provos Exp $"; #endif #include #include #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; }