Add initial TKM Diffie-Hellman implementation

The tkm_diffie_hellman_t plugin acquires a DH context from the Trusted
Key Manager and uses it to get a DH public value and the calculated
shared secret. Proper context handling is still missing though, the
plugin currently uses context ID 1.

The get_shared_secret function will be removed as soon as the TKM
specific keymat is ready.

src/charon-tkm/tests/diffie_hellman_tests.c

@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2012 Reto Buerki
+ * Copyright (C) 2012 Adrian-Ken Rueegsegger
+ * 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.
+ */
+
+#include <check.h>
+
+#include "tkm_diffie_hellman.h"
+
+START_TEST(test_dh_creation)
+{
+	tkm_diffie_hellman_t *dh = NULL;
+
+	dh = tkm_diffie_hellman_create(MODP_768_BIT);
+	fail_if(dh, "MODP_768 created");
+
+	dh = tkm_diffie_hellman_create(MODP_4096_BIT);
+	fail_if(!dh, "MODP_4096 not created");
+
+	dh->dh.destroy(&dh->dh);
+}
+END_TEST
+
+START_TEST(test_dh_get_my_pubvalue)
+{
+	tkm_diffie_hellman_t *dh = tkm_diffie_hellman_create(MODP_4096_BIT);
+	fail_if(!dh, "Unable to create DH");
+
+	chunk_t value;
+	dh->dh.get_my_public_value(&dh->dh, &value);
+	dh->dh.destroy(&dh->dh);
+
+	fail_if(value.ptr == NULL, "Pubvalue is NULL");
+	fail_if(value.len != 512, "Pubvalue size mismatch");
+
+	chunk_free(&value);
+}
+END_TEST
+
+TCase *make_diffie_hellman_tests(void)
+{
+	TCase *tc = tcase_create("Diffie-Hellman tests");
+	tcase_add_test(tc, test_dh_creation);
+	tcase_add_test(tc, test_dh_get_my_pubvalue);
+
+	return tc;
+}

src/charon-tkm/tests/test_runner.c

@@ -29,6 +29,7 @@ int main(void)
 	Suite *s = suite_create("TKM tests");
 	suite_add_tcase(s, make_id_manager_tests());
 	suite_add_tcase(s, make_nonceg_tests());
+	suite_add_tcase(s, make_diffie_hellman_tests());
 
 	SRunner *sr = srunner_create(s);
 

src/charon-tkm/tests/test_runner.h

@@ -21,5 +21,6 @@
 
 TCase *make_id_manager_tests(void);
 TCase *make_nonceg_tests(void);
+TCase *make_diffie_hellman_tests(void);
 
 #endif /** TEST_RUNNER_H_ */