SEC: add interface for message authentication codes.

git-svn-id: https://src.develer.com/svnoss/bertos/trunk@4301 38d2e660-2303-0410-9eaa-f027e97ec537

diff --git a/bertos/sec/mac.h b/bertos/sec/mac.h
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+++ b/bertos/sec/mac.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Generic interface for message authentication algorithms.
+ * \author Giovanni Bajo <rasky@develer.com>
+ * 
+ */
+
+#ifndef SEC_MAC_H
+#define SEC_MAC_H
+
+#include <cfg/compiler.h>
+#include <cfg/debug.h>
+
+typedef struct Mac {
+       uint8_t digest_len;
+       uint8_t key_len;
+       
+       void (*set_key)(struct Mac *m, const uint8_t* key, size_t len); 
+       void (*begin)(struct Mac *m);
+       void (*update)(struct Mac *m, const uint8_t *data, size_t len);
+       uint8_t* (*final)(struct Mac *m);
+} Mac;
+
+INLINE void mac_set_key(Mac *m, const uint8_t* key, size_t len)
+{
+       ASSERT(m->set_key);
+       m->set_key(m, key, len);
+}
+
+INLINE void mac_begin(Mac *m)
+{
+       ASSERT(m->begin);
+       m->begin(m);
+}
+
+INLINE void mac_update(Mac *m, const void *data, size_t len)
+{
+       ASSERT(m->update);
+       m->update(m, data, len);
+}
+
+INLINE uint8_t* mac_final(Mac *m)
+{
+       ASSERT(m->final);
+       return m->final(m);
+}
+
+INLINE size_t mac_digest_len(Mac *m)
+{
+       return m->digest_len;
+}
+
+INLINE size_t mac_key_len(Mac *m)
+{
+       return m->key_len;
+}
+
+#endif