X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=algo%2Fmd2.c;h=a36cc76361618ac8c0b33d55c65a9fa0d1c2221e;hb=HEAD;hp=53b44865776caf105d0a0d27d821c8b083103d5e;hpb=35ae4275d8730a376ca61a92f08fb447eb2935b3;p=bertos.git diff --git a/algo/md2.c b/algo/md2.c deleted file mode 100644 index 53b44865..00000000 --- a/algo/md2.c +++ /dev/null @@ -1,377 +0,0 @@ -/** - * \file - * - * - * \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 - */ - -/*#* - *#* $Log$ - *#* 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 //memset(), memcpy(); -#include -#include //ASSERT() -#include //MIN(), countof(), ROTR(); -#include - - -#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 -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 -