implemented XCBC algorithms (signer, prf) for IKE on top of a crypter

supporting ike=...-aesxcbc-... in ipsec.conf 
added AUTH_AES_XCBC_96 and PRF_AES128_CBC to default IKE proposal
AES XCBC testcase

src/libstrongswan/plugins/xcbc/xcbc_plugin.c

@@ -0,0 +1,65 @@
+/*
+ * 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 "xcbc_plugin.h"
+
+#include <library.h>
+#include "xcbc_signer.h"
+#include "xcbc_prf.h"
+
+typedef struct private_xcbc_plugin_t private_xcbc_plugin_t;
+
+/**
+ * private data of xcbc_plugin
+ */
+struct private_xcbc_plugin_t {
+
+	/**
+	 * public functions
+	 */
+	xcbc_plugin_t public;
+};
+
+/**
+ * Implementation of xcbc_plugin_t.xcbctroy
+ */
+static void destroy(private_xcbc_plugin_t *this)
+{
+	lib->crypto->remove_prf(lib->crypto,
+							(prf_constructor_t)xcbc_prf_create);
+	lib->crypto->remove_signer(lib->crypto,
+							   (signer_constructor_t)xcbc_signer_create);
+	free(this);
+}
+
+/*
+ * see header file
+ */
+plugin_t *plugin_create()
+{
+	private_xcbc_plugin_t *this = malloc_thing(private_xcbc_plugin_t);
+	
+	this->public.plugin.destroy = (void(*)(plugin_t*))destroy;
+	
+	lib->crypto->add_prf(lib->crypto, PRF_AES128_CBC, 
+						 (prf_constructor_t)xcbc_prf_create);
+	lib->crypto->add_signer(lib->crypto, AUTH_AES_XCBC_96, 
+							(signer_constructor_t)xcbc_signer_create);
+
+	return &this->public.plugin;
+}
+