added keyexchange

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;
+}