Added possibility to register custom proposal keywords

Keyword lookup and registration are handled via the new lib->proposal object.

src/libstrongswan/crypto/proposal/proposal_keywords.h

@@ -1,3 +1,18 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * 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.
+ */
+
 /*
  * Copyright (c) 2012 Nanoteq Pty Ltd
  *
@@ -28,14 +43,16 @@
 #ifndef PROPOSAL_KEYWORDS_H_
 #define PROPOSAL_KEYWORDS_H_
 
-#include <crypto/transform.h>
+typedef struct proposal_token_t proposal_token_t;
+typedef struct proposal_keywords_t proposal_keywords_t;
 
-typedef struct proposal_token proposal_token_t;
+#include <library.h>
+#include <crypto/transform.h>
 
 /**
  * Class representing a proposal token..
  */
-struct proposal_token {
+struct proposal_token_t {
 
 	/**
 	 * The name of the token.
@@ -59,11 +76,40 @@ struct proposal_token {
 };
 
 /**
- * Returns a proposal token for the specified string if a token exists.
- *
- * @param str		the string containing the name of the token
- * @return			proposal_tolen if found otherwise NULL
+ * Class to manage proposal keywords
  */
-const proposal_token_t* proposal_get_token(const char *str);
+struct proposal_keywords_t {
+
+	/**
+	 * Returns the proposal token for the specified string if a token exists.
+	 *
+	 * @param str		the string containing the name of the token
+	 * @return			proposal_token if found, NULL otherwise
+	 */
+	const proposal_token_t *(*get_token)(proposal_keywords_t *this,
+										 const char *str);
+
+	/**
+	 * Register a new proposal token for an algorithm.
+	 *
+	 * @param name		the string containing the name of the token
+	 * @param type		the transform_type_t for the token
+	 * @param algorithm	the IKE id of the algorithm
+	 * @param keysize	the key size associated with the specific algorithm
+	 */
+	void (*register_token)(proposal_keywords_t *this, const char *name,
+						   transform_type_t type, u_int16_t algorithm,
+						   u_int16_t keysize);
+
+	/**
+	 * Destroy a proposal_keywords_t instance.
+	 */
+	void (*destroy)(proposal_keywords_t *this);
+};
+
+/**
+ * Create a proposal_keywords_t instance.
+ */
+proposal_keywords_t *proposal_keywords_create();
 
 #endif /** PROPOSAL_KEYWORDS_H_ @}*/