3 This file is part of the ARM-Crypto-Lib.
4 Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 * \brief SHA-224 implementation.
33 #include <string.h> /* for memcpy, memmove, memset */
34 #include <avr/pgmspace.h>
35 #include "sha2_small_common.h"
40 #if defined LITTLE_ENDIAN
41 #elif defined BIG_ENDIAN
43 #error specify endianess!!!
47 /*************************************************************************/
50 uint32_t sha224_init_vector[] PROGMEM = {
51 0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
52 0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4
56 /*************************************************************************/
59 * \brief \c sh224_init initialises a sha224 context for hashing.
60 * \c sh224_init c initialises the given sha224 context for hashing
61 * @param state pointer to a sha224 context
64 void sha224_init(sha224_ctx_t *state){
66 memcpy_P(state->h, sha224_init_vector, 8*4);
69 /*************************************************************************/
70 void sha224_nextBlock (sha224_ctx_t *state, const void *block){
71 sha2_small_common_nextBlock(state, block);
74 /*************************************************************************/
75 void sha224_lastBlock (sha224_ctx_t *state, const void *block, uint16_t length_b){
76 sha2_small_common_lastBlock(state, block, length_b);
78 /*************************************************************************/
81 * \brief function to process the last block being hashed
82 * @param state Pointer to the context in which this block should be processed.
83 * @param block Pointer to the message wich should be hashed.
84 * @param length is the length of only THIS block in BITS not in bytes!
85 * bits are big endian, meaning high bits come first.
86 * if you have a message with bits at the end, the byte must be padded with zeros
89 /*************************************************************************/
94 void sha224(void *dest, const void *msg, uint32_t length_b){ /* length could be choosen longer but this is for µC */
97 while(length_b >= SHA224_BLOCK_BITS){
98 sha224_nextBlock(&s, msg);
99 msg = (uint8_t*)msg + SHA224_BLOCK_BITS/8;
100 length_b -= SHA224_BLOCK_BITS;
102 sha224_lastBlock(&s, msg, length_b);
103 sha224_ctx2hash(dest,&s);
108 /*************************************************************************/
110 void sha224_ctx2hash(void *dest, const sha224_ctx_t *state){
111 #if defined LITTLE_ENDIAN
112 uint8_t i, j, *s=(uint8_t*)(state->h);
117 *((uint8_t*)dest) = s[j];
118 dest = (uint8_t*)dest + 1;
123 memcpy(dest, state->h, 28);
125 # error unsupported endian type!