1 files changed, 79 insertions, 0 deletions
diff --git a/sbin/isakmpd/dh.c b/sbin/isakmpd/dh.c
new file mode 100644
index 00000000000..5062ad44b05
--- /dev/null
+++ b/sbin/isakmpd/dh.c
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+/*	$Id: dh.c,v 1.1 1998/11/15 00:03:48 niklas Exp $	*/
+
+/*
+ * Copyright (c) 1998 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 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 "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.
+ */ 
+
+void
+dh_create_exchange (struct group *group, u_int8_t *buf)
+{
+  group->setrandom (group, group->c);
+  group->operation (group, group->a, group->gen, group->c);
+  group->getraw (group, group->a, buf);
+}
+
+/*
+ * 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.
+ */
+
+void
+dh_create_shared (struct group *group, u_int8_t *secret, u_int8_t *exchange)
+{
+  group->setraw (group, group->b, exchange, group->getlen(group));
+  group->operation (group, group->a, group->b, group->c);
+  group->getraw (group, group->a, secret);
+}