+++ /dev/null
-/**
- * \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 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.
- *#*
- *#* Revision 1.12 2007/02/05 16:52:44 asterix
- *#* Add define for harvard architecture.
- *#*
- *#* Revision 1.11 2007/02/02 18:15:31 asterix
- *#* Add function MD2_test. Fix bug in md2_update function.
- *#*
- *#* Revision 1.9 2007/02/02 13:10:01 asterix
- *#* Fix some bugs in md2_pad and md2_update fuction.
- *#*
- *#* Revision 1.8 2007/02/01 14:45:56 asterix
- *#* Rewrite md2_update function and fix some bug.
- *#*
- *#* Revision 1.7 2007/01/31 18:04:15 asterix
- *#* Write md2_end function
- *#*
- *#* Revision 1.4 2007/01/31 13:51:57 asterix
- *#* Write md2_compute function.
- *#*
- *#* Revision 1.2 2007/01/30 17:31:44 asterix
- *#* Add function prototypes.
- *#*
- *#* Revision 1.1 2007/01/30 15:53:26 batt
- *#* Add first md2 skel.
- *#*
- *#*/
-
-#include "md2.h"
-
-#include <string.h> //memset(), memcpy();
-#include <cfg/compiler.h>
-#include <cfg/debug.h> //ASSERT()
-#include <cfg/macros.h> //MIN(), countof(), ROTR();
-#include <mware/pgm.h>
-
-
-#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 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,
- 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
- 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
- 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
- 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
- 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
- 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
- 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
- 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
- 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
- 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
- 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
- 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
- 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
- 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
- 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)
- {
-
- i = i * K1;
- i = ROTR(i, R);
- i ^= X;
- i = i * K2;
-
- return i;
- }
-
- #define MD2_PERM(x) md2_perm(x)
-
-#endif
-
-
-/**
- * Pad function. Put len_pad unsigned char in
- * input block.
- */
-static void md2_pad(void *_block, size_t len_pad)
-{
- uint8_t *block;
-
- block = (uint8_t *)_block;
-
- ASSERT(len_pad <= CONFIG_MD2_BLOCK_LEN);
-
- /*
- * Fill input block with len_pad char.
- */
- memset(block, len_pad, len_pad);
-
-}
-
-static void md2_compute(void *_state, void *_checksum, void *_block)
-{
- int i = 0;
- uint16_t t = 0;
- uint8_t compute_array[COMPUTE_ARRAY_LEN];
- uint8_t *state;
- uint8_t *checksum;
- uint8_t *block;
-
- state = (uint8_t *)_state;
- checksum = (uint8_t *)_checksum;
- block = (uint8_t *)_block;
-
- /*
- * Copy state and checksum context in compute array.
- */
- memcpy(compute_array, state, CONFIG_MD2_BLOCK_LEN);
- memcpy(compute_array + CONFIG_MD2_BLOCK_LEN, block, CONFIG_MD2_BLOCK_LEN);
-
- /*
- * Fill compute array with state XOR block
- */
- for(i = 0; i < CONFIG_MD2_BLOCK_LEN; i++)
- compute_array[i + (CONFIG_MD2_BLOCK_LEN * 2)] = state[i] ^ block[i];
-
- /*
- * Encryt block.
- */
- for(i = 0; i < NUM_COMPUTE_ROUNDS; i++)
- {
- for(int j = 0; j < COMPUTE_ARRAY_LEN; j++)
- {
- compute_array[j] ^= MD2_PERM(t);
- t = compute_array[j];
- }
-
- t = (t + i) & 0xff; //modulo 256.
- }
- /*
- * Update checksum.
- */
- t = checksum[CONFIG_MD2_BLOCK_LEN - 1];
-
- for(i = 0; i < CONFIG_MD2_BLOCK_LEN; i++)
- {
- checksum[i] ^= MD2_PERM(block[i] ^ t);
- t = checksum[i];
- }
-
- /*
- * Update state and clean compute array.
- */
- memcpy(state, compute_array, CONFIG_MD2_BLOCK_LEN);
- memset(compute_array, 0, sizeof(compute_array));
-}
-
-/**
- * Algorithm initialization.
- *
- * \param context empty context.
- */
-void md2_init(Md2Context *context)
-{
-
- memset(context, 0, sizeof(Md2Context));
-
-}
-
-/**
- * Update block.
- */
-void md2_update(Md2Context *context, const void *_block_in, size_t block_len)
-{
-
- const uint8_t *block_in;
- size_t cpy_len;
-
-
- block_in = (const uint8_t *)_block_in;
-
- while(block_len > 0)
- {
- /*
- * Choose a number of block that fill input context buffer.
- */
- 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
- * context buffer block lenght.
- */
- context->counter += cpy_len;
- block_len -= cpy_len;
- block_in += cpy_len;
-
- /*
- * If buffer is full, compute it.
- */
- if (context->counter >= CONFIG_MD2_BLOCK_LEN)
- {
- md2_compute(context->state, context->checksum, context->buffer);
- context->counter = 0;
- }
- }
-
-
-}
-/**
- * Ends an MD2 message digest operation.
- * This fuction take an context and return a pointer
- * to context state.
- *
- * \param context in input.
- * \return a pointer to context state (message digest).
- */
-uint8_t *md2_end(Md2Context *context)
-{
-
- uint8_t buf[CONFIG_MD2_BLOCK_LEN];
-
- /*
- * Fill remaning empty context buffer.
- */
- md2_pad(buf, CONFIG_MD2_BLOCK_LEN - context->counter);
-
- /*
- * Update context buffer and compute it.
- */
- md2_update(context, buf, CONFIG_MD2_BLOCK_LEN - context->counter);
-
- /*
- * Add context checksum to message input.
- */
- md2_update(context, context->checksum, CONFIG_MD2_BLOCK_LEN);
-
-
- return context->state; //return a pointer to message digest.
-}
-/**
- * MD2 test fuction.
- * This function test MD2 algorithm with a standard string specified
- * in RFC 1319.
- *
- * \note This test work with official array of 256 byte pemutation
- * contructed from digits of pi, defined in the RFC 1319.
- *
- */
-bool md2_test(void)
-{
-
- Md2Context context;
-
- const char *test[] =
- {
- "",
- "message digest",
- "abcdefghijklmnopqrstuvwxyz",
- "12345678901234567890123456789012345678901234567890123456789012345678901234567890"
- };
-
-
- const uint8_t *result[] = {
- "\x83\x50\xe5\xa3\xe2\x4c\x15\x3d\xf2\x27\x5c\x9f\x80\x69\x27\x73",
- "\xab\x4f\x49\x6b\xfb\x2a\x53\x0b\x21\x9f\xf3\x30\x31\xfe\x06\xb0",
- "\x4e\x8d\xdf\xf3\x65\x02\x92\xab\x5a\x41\x08\xc3\xaa\x47\x94\x0b",
- "\xd5\x97\x6f\x79\xd8\x3d\x3a\x0d\xc9\x80\x6c\x3c\x66\xf3\xef\xd8",
- };
-
-
- for (int i = 0; i < countof(test); i++)
- {
- md2_init(&context);
- md2_update(&context, test[i], strlen(test[i]));
-
- if(memcmp(result[i], md2_end(&context), MD2_DIGEST_LEN))
- return false;
- }
-
- return true;
-}
-
-#if 0
-
-#include <stdio.h>
-int main(int argc, char * argv[])
-{
-
- if(md2_test())
- printf("MD2 algorithm work well!\n");
- else
- printf("MD2 algorithm doesn't work well.\n");
-
-}
-
-#endif
-
projects / bertos.git / blobdiff