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bertos/algo/md2.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 2007 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief MD2 Message-Digest algorithm.
+ *
+ * The algorithm takes as input a message of arbitrary length and produces
+ * as output a 128-bit message digest of the input.
+ * It is conjectured that it is computationally infeasible to produce
+ * two messages having the same message digest, or to produce any
+ * message having a given prespecified target message digest.
+ *
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ * $WIZ$ module_name = "md2"
+ * $WIZ$ module_configuration = "bertos/cfg/cfg_md2.h"
+ */
+
+#ifndef ALGO_MD2_H
+#define ALGO_MD2_H
+
+#include "cfg/cfg_md2.h"
+#include <cfg/compiler.h>
+
+#define NUM_COMPUTE_ROUNDS 18                           ///< Number of compute rounds.
+#define COMPUTE_ARRAY_LEN  CONFIG_MD2_BLOCK_LEN * 3     ///< Lenght of compute array.
+#define MD2_DIGEST_LEN CONFIG_MD2_BLOCK_LEN
+/**
+ * Context for MD2 computation.
+ */
+typedef struct Md2Context
+{
+	uint8_t buffer[CONFIG_MD2_BLOCK_LEN];   ///< Input buffer.
+	uint8_t state[CONFIG_MD2_BLOCK_LEN];    ///< Current state buffer.
+	uint8_t checksum[CONFIG_MD2_BLOCK_LEN]; ///< Checksum.
+	size_t counter;                         ///< Counter of remaining bytes.
+
+} Md2Context;
+
+void md2_init(Md2Context *context);
+void md2_update(Md2Context *context, const void *block_in, size_t block_len);
+uint8_t *md2_end(Md2Context *context);
+bool md2_test(void);
+
+#endif /* ALGO_MD2_H */