/**
* \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 MD2 Message-Digest algorithm.
*
+ * The MD2 algorithm work with a constant array of 256 permutationt
+ * defined in RFC1319. If you don't want to use a standard array of
+ * permutatione you can use a md2_perm() function that generate an
+ * array of 256 "casual" permutation. To swich from a standard array
+ * to md2_perm function you must chanche CONFIG_MD2_STD_PERM defined in
+ * appconfig.h.
+ * If you need to store array in program memory you must define
+ * a macro _PROGMEM (for more info see mware/pgm.h).
+ *
+ *
* \version $Id$
* \author Daniele Basile <asterix@develer.com>
*/
/*#*
*#* $Log$
+ *#* Revision 1.17 2007/06/07 16:06:39 batt
+ *#* Fix some doxygen errors.
+ *#*
+ *#* Revision 1.16 2007/02/15 13:29:49 asterix
+ *#* Add MD2_DIGEST_LEN macro.
+ *#*
+ *#* Revision 1.15 2007/02/06 15:53:34 asterix
+ *#* Add ROTR macro in m2d_perm, add comments, typos.
+ *#*
*#* Revision 1.13 2007/02/05 18:44:42 asterix
*#* Add md2_perm function.
*#*
#include <string.h> //memset(), memcpy();
#include <cfg/compiler.h>
#include <cfg/debug.h> //ASSERT()
-#include <cfg/macros.h> //MIN(), countof();
-#include <mware/pgm.h>
+#include <cfg/macros.h> //MIN(), countof(), ROTR();
+#include <mware/pgm.h>
-#ifdef STD_PERMUTATION
+#if CONFIG_MD2_STD_PERM
/*
* Official array of 256 byte pemutation contructed from digits of pi, defined
* in the RFC 1319.
*/
- static const uint8_t PROGMEM md2_perm[256] =
+ static const uint8_t PGM_ATTR md2_perm[256] =
{
41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
31, 26, 219, 153, 141, 51, 159, 17, 131, 20
};
+
+ #define MD2_PERM(x) PGM_READ_CHAR(&md2_perm[x])
#else
/**
* Md2_perm() function generate an array of 256 "casual" permutation.
*/
-
+
/**
* Costant define for computing an array of 256 "casual" permutation.
+ * \{
*/
#define K1 5
#define K2 3
#define R 2
#define X 172
+ /*\}*/
+ static uint8_t md2_perm(uint8_t i)
+ {
-uint8_t md2_perm(uint8_t i)
-{
-
- i = i * K1;
- i = (i >> R) ^ (i << R); //Rotate i for R times.
- i ^= X;
- i = i * K2;
+ i = i * K1;
+ i = ROTR(i, R);
+ i ^= X;
+ i = i * K2;
- return i;
-}
-
-#endif
+ return i;
+ }
+ #define MD2_PERM(x) md2_perm(x)
-#if CPU_HARVARD
- #ifdef STD_PERMUTATION
- #define MD2_PERM(x) pgm_read_char(&md2_permr[x]) //Read from program memory, if CPU is harvard
- #else
- #define MD2_PERM(x) pgm_read_char(&md2_permr(x)) //Read from program memory, if CPU is harvard
- #endif
-#else
- #ifdef STD_PERMUTATION
- #define MD2_PERM(x) md2_perm[x] //
- #else
- #define MD2_PERM(x) md2_perm(x) //
- #endif
#endif
+
/**
* Pad function. Put len_pad unsigned char in
* input block.
/**
* Algorithm initialization.
*
- * \param empty context.
+ * \param context empty context.
*/
void md2_init(Md2Context *context)
{
*/
cpy_len = MIN(block_len, CONFIG_MD2_BLOCK_LEN - context->counter);
-
+
/*
* Copy in the buffer input block.
*/
memcpy(&context->buffer[context->counter], block_in, cpy_len);
/*
- * Update a context counter, input block length and remaning
+ * Update a context counter, input block length and remaning
* context buffer block lenght.
*/
context->counter += cpy_len;
md2_init(&context);
md2_update(&context, test[i], strlen(test[i]));
- if(memcmp(result[i], md2_end(&context), CONFIG_MD2_BLOCK_LEN))
+ if(memcmp(result[i], md2_end(&context), MD2_DIGEST_LEN))
return false;
}
projects / bertos.git / blobdiff