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-256 implementation.
33 #include <string.h> /* for memcpy, memmove, memset */
34 #include "sha2_small_common.h"
39 #if defined LITTLE_ENDIAN
40 #elif defined BIG_ENDIAN
42 #error specify endianess!!!
46 /*************************************************************************/
49 uint32_t sha256_init_vector[]={
50 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
51 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 };
54 /*************************************************************************/
57 * \brief \c sh256_init initialises a sha256 context for hashing.
58 * \c sh256_init c initialises the given sha256 context for hashing
59 * @param state pointer to a sha256 context
62 void sha256_init(sha256_ctx_t *state){
64 memcpy(state->h, sha256_init_vector, 8*4);
67 /*************************************************************************/
68 void sha256_nextBlock (sha256_ctx_t *state, const void* block){
69 sha2_small_common_nextBlock(state, block);
72 /*************************************************************************/
73 void sha256_lastBlock (sha256_ctx_t *state, const void* block, uint16_t length_b){
74 sha2_small_common_lastBlock(state, block, length_b);
76 /*************************************************************************/
79 * \brief function to process the last block being hashed
80 * @param state Pointer to the context in which this block should be processed.
81 * @param block Pointer to the message wich should be hashed.
82 * @param length is the length of only THIS block in BITS not in bytes!
83 * bits are big endian, meaning high bits come first.
84 * if you have a message with bits at the end, the byte must be padded with zeros
87 /*************************************************************************/
92 void sha256(void* dest, const void* msg, uint32_t length_b){ /* length could be choosen longer but this is for µC */
95 while(length_b >= SHA256_BLOCK_BITS){
96 sha256_nextBlock(&s, msg);
97 msg = (uint8_t*)msg + SHA256_BLOCK_BITS/8;
98 length_b -= SHA256_BLOCK_BITS;
100 sha256_lastBlock(&s, msg, length_b);
101 sha256_ctx2hash(dest,&s);
106 /*************************************************************************/
108 void sha256_ctx2hash(void* dest, const sha256_ctx_t *state){
109 #if defined LITTLE_ENDIAN
110 uint8_t i, j, *s=(uint8_t*)(state->h);
115 *((uint8_t*)dest) = s[j];
116 dest = (uint8_t*)dest + 1;
121 memcpy(dest, state->h, 32);
123 # error unsupported endian type!