129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* sha256.c */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file sha256.c
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* \author Daniel Otte
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* \date 16.05.2006
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*
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* \par License:
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* GPL
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*
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* \brief SHA-256 implementation.
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*
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*
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*/
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#include <stdint.h>
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#include <string.h> /* for memcpy, memmove, memset */
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#include <avr/pgmspace.h>
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#include "sha2_small_common.h"
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#include "sha256.h"
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#define LITTLE_ENDIAN
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#if defined LITTLE_ENDIAN
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#elif defined BIG_ENDIAN
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#else
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#error specify endianess!!!
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#endif
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/*************************************************************************/
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const
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uint32_t sha256_init_vector[] PROGMEM = {
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0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A,
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0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 };
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/*************************************************************************/
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/**
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* \brief \c sh256_init initialises a sha256 context for hashing.
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* \c sh256_init c initialises the given sha256 context for hashing
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* @param state pointer to a sha256 context
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* @return none
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*/
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void sha256_init(sha256_ctx_t *state){
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state->length=0;
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memcpy_P(state->h, sha256_init_vector, 8*4);
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}
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/*************************************************************************/
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void sha256_nextBlock (sha256_ctx_t *state, const void *block){
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sha2_small_common_nextBlock(state, block);
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}
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/*************************************************************************/
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void sha256_lastBlock (sha256_ctx_t *state, const void *block, uint16_t length_b){
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sha2_small_common_lastBlock(state, block, length_b);
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}
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/*************************************************************************/
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/**
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* \brief function to process the last block being hashed
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* @param state Pointer to the context in which this block should be processed.
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* @param block Pointer to the message wich should be hashed.
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* @param length is the length of only THIS block in BITS not in bytes!
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* bits are big endian, meaning high bits come first.
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* if you have a message with bits at the end, the byte must be padded with zeros
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*/
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/*************************************************************************/
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/*
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* length in bits!
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*/
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void sha256(void *dest, const void *msg, uint32_t length_b){ /* length could be choosen longer but this is for µC */
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sha256_ctx_t s;
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sha256_init(&s);
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while(length_b >= SHA256_BLOCK_BITS){
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sha256_nextBlock(&s, msg);
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msg = (uint8_t*)msg + SHA256_BLOCK_BITS/8;
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length_b -= SHA256_BLOCK_BITS;
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}
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sha256_lastBlock(&s, msg, length_b);
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sha256_ctx2hash(dest,&s);
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}
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/*************************************************************************/
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void sha256_ctx2hash(void *dest, const sha256_ctx_t *state){
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#if defined LITTLE_ENDIAN
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uint8_t i, j, *s=(uint8_t*)(state->h);
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i=8;
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do{
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j=3;
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do{
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*((uint8_t*)dest) = s[j];
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dest = (uint8_t*)dest + 1;
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}while(j--);
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s += 4;
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}while(--i);
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#elif BIG_ENDIAN
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memcpy(dest, state->h, 32);
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#else
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# error unsupported endian type!
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#endif
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}
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