added a MODP_NULL Diffie Hellman group to avoid calculation overhead in load-testing

src/charon/config/proposal.c

@@ -739,6 +739,10 @@ static status_t add_string_algo(private_proposal_t *this, chunk_t alg)
 			add_algorithm(this, PSEUDO_RANDOM_FUNCTION, PRF_AES128_XCBC, 0);
 		}
 	}
+	else if (strncmp(alg.ptr, "modpnull", alg.len) == 0)
+	{
+		add_algorithm(this, DIFFIE_HELLMAN_GROUP, MODP_NULL, 0);
+	}
 	else if (strncmp(alg.ptr, "modp768", alg.len) == 0)
 	{
 		add_algorithm(this, DIFFIE_HELLMAN_GROUP, MODP_768_BIT, 0);
@@ -1030,6 +1034,9 @@ static void proposal_add_supported_ike(private_proposal_t *this)
 	{
 		switch (group)
 		{
+			case MODP_NULL:
+				/* only for testing purposes */
+				break;
 			case MODP_768_BIT:
 				/* weak */
 				break;

src/charon/plugins/load_tester/Makefile.am

@@ -10,7 +10,8 @@ libstrongswan_load_tester_la_SOURCES = \
   load_tester_config.c load_tester_config.h \
   load_tester_creds.c load_tester_creds.h \
   load_tester_ipsec.c load_tester_ipsec.h \
-  load_tester_listener.c load_tester_listener.h
+  load_tester_listener.c load_tester_listener.h \
+  load_tester_diffie_hellman.c load_tester_diffie_hellman.h
 
 libstrongswan_load_tester_la_LDFLAGS = -module
 

src/charon/plugins/load_tester/load_tester_diffie_hellman.c

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+#include "load_tester_diffie_hellman.h"
+
+/**
+ * Implementation of gmp_diffie_hellman_t.get_my_public_value.
+ */
+static void get_my_public_value(load_tester_diffie_hellman_t *this,
+								chunk_t *value)
+{
+	*value = chunk_empty;
+}
+
+/**
+ * Implementation of gmp_diffie_hellman_t.get_shared_secret.
+ */
+static status_t get_shared_secret(load_tester_diffie_hellman_t *this,
+								  chunk_t *secret)
+{
+	*secret = chunk_empty;
+	return SUCCESS;
+}
+
+/**
+ * Implementation of gmp_diffie_hellman_t.get_dh_group.
+ */
+static diffie_hellman_group_t get_dh_group(load_tester_diffie_hellman_t *this)
+{
+	return MODP_NULL;
+}
+
+/**
+ * See header
+ */
+load_tester_diffie_hellman_t *load_tester_diffie_hellman_create(
+												diffie_hellman_group_t group)
+{
+	load_tester_diffie_hellman_t *this;
+	
+	if (group != MODP_NULL)
+	{
+		return NULL;
+	}
+	
+	this = malloc_thing(load_tester_diffie_hellman_t);
+	
+	this->dh.get_shared_secret = (status_t (*)(diffie_hellman_t *, chunk_t *))get_shared_secret;
+	this->dh.set_other_public_value = (void (*)(diffie_hellman_t *, chunk_t ))nop;
+	this->dh.get_my_public_value = (void (*)(diffie_hellman_t *, chunk_t *))get_my_public_value;
+	this->dh.get_dh_group = (diffie_hellman_group_t (*)(diffie_hellman_t *))get_dh_group;
+	this->dh.destroy = (void (*)(diffie_hellman_t *))free;
+	
+	return this;
+}

src/charon/plugins/load_tester/load_tester_diffie_hellman.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2008 Martin Willi
+ * Hochschule fuer Technik Rapperswil
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ *
+ * $Id$
+ */
+
+/**
+ * @defgroup load_tester_diffie_hellman load_tester_diffie_hellman
+ * @{ @ingroup load_tester
+ */
+
+#ifndef LOAD_TESTER_DIFFIE_HELLMAN_H_
+#define LOAD_TESTER_DIFFIE_HELLMAN_H_
+
+#include <crypto/diffie_hellman.h>
+
+typedef struct load_tester_diffie_hellman_t load_tester_diffie_hellman_t;
+
+/**
+ * A NULL Diffie Hellman implementation to avoid calculation overhead in tests.
+ */
+struct load_tester_diffie_hellman_t {
+	
+	/**
+	 * Implements diffie_hellman_t interface.
+	 */
+	diffie_hellman_t dh;
+};
+
+/**
+ * Creates a new gmp_diffie_hellman_t object.
+ * 
+ * @param group			Diffie Hellman group, supports MODP_NULL only
+ * @return				gmp_diffie_hellman_t object
+ */
+load_tester_diffie_hellman_t *load_tester_diffie_hellman_create(
+												diffie_hellman_group_t group);
+
+#endif /* LOAD_TESTER_DIFFIE_HELLMAN_ @}*/

src/charon/plugins/load_tester/load_tester_plugin.c

@@ -20,6 +20,7 @@
 #include "load_tester_creds.h"
 #include "load_tester_ipsec.h"
 #include "load_tester_listener.h"
+#include "load_tester_diffie_hellman.h"
 
 #include <unistd.h>
 
@@ -132,6 +133,8 @@ static void destroy(private_load_tester_plugin_t *this)
 	this->config->destroy(this->config);
 	this->creds->destroy(this->creds);
 	this->listener->destroy(this->listener);
+	lib->crypto->remove_dh(lib->crypto,
+						(dh_constructor_t)load_tester_diffie_hellman_create);
 	free(this);
 }
 
@@ -145,6 +148,9 @@ plugin_t *plugin_create()
 	
 	this->public.plugin.destroy = (void(*)(plugin_t*))destroy;
 	
+	lib->crypto->add_dh(lib->crypto, MODP_NULL, 
+						(dh_constructor_t)load_tester_diffie_hellman_create);
+	
 	this->config = load_tester_config_create();
 	this->creds = load_tester_creds_create();
 	this->listener = load_tester_listener_create();

src/libstrongswan/crypto/diffie_hellman.c

@@ -36,5 +36,7 @@ ENUM_NEXT(diffie_hellman_group_names, MODP_2048_BIT, ECP_521_BIT, MODP_1536_BIT,
 ENUM_NEXT(diffie_hellman_group_names, ECP_192_BIT, ECP_224_BIT, ECP_521_BIT,
 	"ECP_192_BIT",
 	"ECP_224_BIT");
-ENUM_END(diffie_hellman_group_names, ECP_224_BIT);
+ENUM_NEXT(diffie_hellman_group_names, MODP_NULL, MODP_NULL, ECP_224_BIT,
+	"MODP_NULL");
+ENUM_END(diffie_hellman_group_names, MODP_NULL);
 

src/libstrongswan/crypto/diffie_hellman.h

@@ -52,6 +52,8 @@ enum diffie_hellman_group_t {
 	ECP_521_BIT   = 21,
 	ECP_192_BIT   = 25,
 	ECP_224_BIT   = 26,
+	/** insecure NULL diffie hellman group for testing, in PRIVATE USE */
+	MODP_NULL = 1024,
 };
 
 /**