1 files changed, 140 insertions, 0 deletions
diff --git a/src/charon-tkm/src/tkm/tkm_diffie_hellman.c b/src/charon-tkm/src/tkm/tkm_diffie_hellman.c
new file mode 100644
index 000000000..19f57de01
--- /dev/null
+++ b/src/charon-tkm/src/tkm/tkm_diffie_hellman.c
@@ -0,0 +1,140 @@
+/*
+ * Copyrigth (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 <tkm/client.h>
+#include <tkm/constants.h>
+
+#include "tkm.h"
+#include "tkm_utils.h"
+#include "tkm_diffie_hellman.h"
+
+#include <utils/debug.h>
+
+typedef struct private_tkm_diffie_hellman_t private_tkm_diffie_hellman_t;
+
+/**
+ * Private data of a tkm_diffie_hellman_t object.
+ */
+struct private_tkm_diffie_hellman_t {
+
+	/**
+	 * Public tkm_diffie_hellman_t interface.
+	 */
+	tkm_diffie_hellman_t public;
+
+	/**
+	 * Diffie Hellman group number.
+	 */
+	u_int16_t group;
+
+	/**
+	 * Diffie Hellman public value.
+	 */
+	dh_pubvalue_type pubvalue;
+
+	/**
+	 * Context id.
+	 */
+	dh_id_type context_id;
+
+};
+
+METHOD(diffie_hellman_t, get_my_public_value, void,
+	private_tkm_diffie_hellman_t *this, chunk_t *value)
+{
+	sequence_to_chunk(this->pubvalue.data, this->pubvalue.size, value);
+}
+
+METHOD(diffie_hellman_t, get_shared_secret, status_t,
+	private_tkm_diffie_hellman_t *this, chunk_t *secret)
+{
+	*secret = chunk_empty;
+	return SUCCESS;
+}
+
+
+METHOD(diffie_hellman_t, set_other_public_value, void,
+	private_tkm_diffie_hellman_t *this, chunk_t value)
+{
+	// TODO: unvoid this function
+
+	dh_pubvalue_type othervalue;
+	othervalue.size = value.len;
+	memcpy(&othervalue.data, value.ptr, value.len);
+
+	ike_dh_generate_key(this->context_id, othervalue);
+}
+
+METHOD(diffie_hellman_t, get_dh_group, diffie_hellman_group_t,
+	private_tkm_diffie_hellman_t *this)
+{
+	return this->group;
+}
+
+METHOD(diffie_hellman_t, destroy, void,
+	private_tkm_diffie_hellman_t *this)
+{
+	if (ike_dh_reset(this->context_id) != TKM_OK)
+	{
+		DBG1(DBG_LIB, "failed to reset DH context %d", this->context_id);
+	}
+
+	tkm->idmgr->release_id(tkm->idmgr, TKM_CTX_DH, this->context_id);
+	free(this);
+}
+
+METHOD(tkm_diffie_hellman_t, get_id, dh_id_type,
+	private_tkm_diffie_hellman_t *this)
+{
+	return this->context_id;
+}
+
+/*
+ * Described in header.
+ */
+tkm_diffie_hellman_t *tkm_diffie_hellman_create(diffie_hellman_group_t group)
+{
+	private_tkm_diffie_hellman_t *this;
+
+	INIT(this,
+		.public = {
+			.dh = {
+				.get_shared_secret = _get_shared_secret,
+				.set_other_public_value = _set_other_public_value,
+				.get_my_public_value = _get_my_public_value,
+				.get_dh_group = _get_dh_group,
+				.destroy = _destroy,
+			},
+			.get_id = _get_id,
+		},
+		.group = group,
+		.context_id = tkm->idmgr->acquire_id(tkm->idmgr, TKM_CTX_DH),
+	);
+
+	if (!this->context_id)
+	{
+		free(this);
+		return NULL;
+	}
+
+	if (ike_dh_create(this->context_id, group, &this->pubvalue) != TKM_OK)
+	{
+		free(this);
+		return NULL;
+	}
+
+	return &this->public;
+}