+/* sha256.c */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
+
+ This program 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
/**
* \file sha256.c
* \author Daniel Otte
/**
* block must be, 512, Bit = 64, Byte, long !!!
*/
-void sha256_nextBlock (sha256_ctx_t *state, void* block){
+void sha256_nextBlock (sha256_ctx_t *state, const void* block){
uint32_t w[64]; /* this is 256, byte, large, */
uint8_t i;
uint32_t a[8],t1,t2;
* bits are big endian, meaning high bits come first.
* if you have a message with bits at the end, the byte must be padded with zeros
*/
-void sha256_lastBlock(sha256_ctx_t *state, void* block, uint16_t length){
+void sha256_lastBlock(sha256_ctx_t *state, const void* block, uint16_t length){
uint8_t lb[SHA256_BLOCK_BITS/8]; /* local block */
state->length += length;
memcpy (&(lb[0]), block, length/8);
/* set the final one bit */
- if (length & 0x3){ // if we have single bits at the end
+ if (length & 0x7){ // if we have single bits at the end
lb[length/8] = ((uint8_t*)(block))[length/8];
} else {
lb[length/8] = 0;
}
- lb[length/8] |= 0x80>>(length & 0x3);
+ lb[length/8] |= 0x80>>(length & 0x7);
length =(length >> 3) + 1; /* from now on length contains the number of BYTES in lb*/
/* pad with zeros */
if (length>64-8){ /* not enouth space for 64bit length value */
/*
* length in bits!
*/
-void sha256(sha256_hash_t *dest, void* msg, uint32_t length){ /* length could be choosen longer but this is for ?C */
+void sha256(sha256_hash_t *dest, const void* msg, uint32_t length){ /* length could be choosen longer but this is for ยตC */
sha256_ctx_t s;
sha256_init(&s);
while(length >= SHA256_BLOCK_BITS){
sha256_nextBlock(&s, msg);
- msg += SHA256_BLOCK_BITS/8;
+ msg = (uint8_t*)msg + SHA256_BLOCK_BITS/8;
length -= SHA256_BLOCK_BITS;
}
sha256_lastBlock(&s, msg, length);
/*************************************************************************/
-void sha256_ctx2hash(sha256_hash_t *dest, sha256_ctx_t *state){
+void sha256_ctx2hash(sha256_hash_t *dest, const sha256_ctx_t *state){
#if defined LITTLE_ENDIAN
uint8_t i;
for(i=0; i<8; ++i){