diff options
Diffstat (limited to 'keyexchange/isakmpd-20041012/dh.c')
| -rw-r--r-- | keyexchange/isakmpd-20041012/dh.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/keyexchange/isakmpd-20041012/dh.c b/keyexchange/isakmpd-20041012/dh.c new file mode 100644 index 0000000..afb41ba --- /dev/null +++ b/keyexchange/isakmpd-20041012/dh.c @@ -0,0 +1,82 @@ +/* $OpenBSD: dh.c,v 1.9 2004/04/15 18:39:25 deraadt 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. + * + * 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; +} |