/**
* \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/)
- * This file is part of DevLib - See README.devlib for information.
+ *
* -->
*
* \brief API function for to manage entropy pool.
/*#*
*#* $Log$
+ *#* Revision 1.20 2007/06/07 16:06:39 batt
+ *#* Fix some doxygen errors.
+ *#*
+ *#* Revision 1.19 2007/02/15 13:54:26 asterix
+ *#* Rename randpool_getN in randpool_get. Fix bug in randpool_get.
+ *#*
*#* Revision 1.17 2007/02/15 13:40:42 asterix
*#* Fix bug in randpool_add and randpool_strir.
*#*
}
/**
- * Add \param entropy bits from \param data buffer to the entropy \param pool.
+ * Add \param entropy bits from \param data buffer to the entropy \param pool
*/
void randpool_add(EntropyPool *pool, void *data, size_t entropy)
{
data = (uint8_t *)_data;
memset(pool, 0, sizeof(EntropyPool));
- pool->pos_get = CONFIG_MD2_BLOCK_LEN;
+ pool->pos_get = MD2_DIGEST_LEN;
#if CONFIG_RANDPOOL_TIMER
pool->last_counter = timer_clock();
#endif
- ASSERT(len < CONFIG_SIZE_ENTROPY_POOL);
-
- if(len > 0)
+ if(data)
{
/*
* Initialize a entropy pool with a
* previous pool, and assume all pool as
* entropy.
*/
+ len = MIN(len,(size_t)CONFIG_SIZE_ENTROPY_POOL);
memcpy(pool->pool_entropy, data, len);
pool->entropy = len;
}
return pool->entropy;
}
-void randpool_get(EntropyPool *pool, void *data, size_t n_byte)
-{
-
-}
-
/**
- * Get n_byte from entropy pool. If n_byte is larger than number
- * byte of entropy in entropy pool, rand_pool_getN continue
+ * Get \param n_byte from entropy pool. If n_byte is larger than number
+ * byte of entropy in entropy pool, randpool_get continue
* to generate pseudocasual value from previous state of
* pool.
+ * \param n_byte number fo bytes to read.
+ * \param pool is the pool entropy context.
+ * \param _data is the pointer to write the random data to.
*/
-void randpool_getN(EntropyPool *pool, void *_data, size_t n_byte)
+void randpool_get(EntropyPool *pool, void *_data, size_t n_byte)
{
Md2Context context;
size_t i = pool->pos_get;
size_t n = n_byte;
size_t pos_write = 0; //Number of block has been written in data.
- size_t len = MIN((size_t)CONFIG_MD2_BLOCK_LEN, n_byte);
+ size_t len = MIN((size_t)MD2_DIGEST_LEN, n_byte);
uint8_t *data;
data = (uint8_t *)_data;
/* Test if i + CONFIG_MD2_BLOCK_LEN is inside of entropy pool.*/
- ASSERT((CONFIG_MD2_BLOCK_LEN + i) < CONFIG_SIZE_ENTROPY_POOL);
+ ASSERT((MD2_DIGEST_LEN + i) < CONFIG_SIZE_ENTROPY_POOL);
- md2_init(&context);
+ md2_init(&context);
while(n > 0)
{
/*Hash previous state of pool*/
- md2_update(&context, &pool->pool_entropy[i], CONFIG_MD2_BLOCK_LEN);
+ md2_update(&context, &pool->pool_entropy[i], MD2_DIGEST_LEN);
memcpy(&data[pos_write], md2_end(&context), len);
pos_write += len; //Update number of block has been written in data.
n -= len; //Number of byte copied in data.
- len = MIN(n,(size_t)CONFIG_MD2_BLOCK_LEN);
+ len = MIN(n,(size_t)MD2_DIGEST_LEN);
- i = (i + CONFIG_MD2_BLOCK_LEN) % CONFIG_SIZE_ENTROPY_POOL;
+ i = (i + MD2_DIGEST_LEN) % CONFIG_SIZE_ENTROPY_POOL;
/* If we haven't more entropy pool to hash, we stir it.*/
- if(i < CONFIG_MD2_BLOCK_LEN)
+ if(i < MD2_DIGEST_LEN)
{
randpool_stir(pool);
i = pool->pos_get;
}
}
-
pool->pos_get = i; //Current number of byte we get from pool.
-
pool->entropy -= n_byte; //Update a entropy.
/*If we get all entropy entropy is 0*/