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bertos/algo/randpool.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 Collection of functions to manage entropy pool.
+ *
+ *
+ * \author Daniele Basile <asterix@develer.com>
+ *
+ * $WIZ$ module_name = "randpool"
+ * $WIZ$ module_depends = "timer", "sprintf"
+ * $WIZ$ module_configuration = "bertos/cfg/cfg_randpool.h"
+ */
+
+#ifndef ALGO_RANDPOOL_H
+#define ALGO_RANDPOOL_H
+
+#include "cfg/cfg_randpool.h"
+#include <cfg/compiler.h>
+
+
+/**
+ * Sturct data of entropy pool.
+ */
+typedef struct EntropyPool
+{
+	size_t entropy;                                  ///< Actual value of entropy (byte).
+	size_t pos_add;                                  ///< Number of byte added in entropy pool.
+	size_t pos_get;                                  ///< Number of byte got in entropy pool.
+	size_t counter;                                  ///< Counter.
+
+#if CONFIG_RANDPOOL_TIMER
+	size_t last_counter;                             ///< Last timer value.
+#endif
+
+	uint8_t pool_entropy[CONFIG_SIZE_ENTROPY_POOL];  ///< Entropy pool.
+
+} EntropyPool;
+
+
+void randpool_add(EntropyPool *pool, void *data, size_t entropy);
+void randpool_init(EntropyPool *pool, void *_data, size_t len);
+size_t randpool_size(EntropyPool *pool);
+void randpool_get(EntropyPool *pool, void *data, size_t n_byte);
+uint8_t *randpool_pool(EntropyPool *pool);
+
+#endif /* ALGO_RANDPOOL_H */