X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=sha256.c;h=1896deea2c5c8a03a71f652ec142264f64e7356d;hb=96ebafd201c9e8441c7677577b24aa402c1defc6;hp=30ab0a53494a6aff4cb147b119c796681b264723;hpb=6e51024d966bd015cb8f9c8460c5c21da6a08f9e;p=avr-crypto-lib.git

diff --git a/sha256.c b/sha256.c
index 30ab0a5..1896dee 100644
--- a/sha256.c
+++ b/sha256.c
@@ -1,3 +1,21 @@
+/* sha256.c */
+/*
+    This file is part of the Crypto-avr-lib/microcrypt-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 
@@ -93,7 +111,7 @@ uint32_t k[]={
 /**
  * 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;
@@ -140,7 +158,7 @@ void sha256_nextBlock (sha256_ctx_t *state, void* block){
  *  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);
@@ -180,12 +198,12 @@ void sha256_lastBlock(sha256_ctx_t *state, void* block, uint16_t length){
 /*
  * length in bits!
  */
-void sha256(sha256_hash_t *dest, void* msg, uint32_t length){ /* length could be choosen longer but this is for µC */
+void sha256(sha256_hash_t *dest, const void* msg, uint32_t length){ /* length could be choosen longer but this is for µC */
 	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);
@@ -196,7 +214,7 @@ void sha256(sha256_hash_t *dest, void* msg, uint32_t length){ /* length could be
 
 /*************************************************************************/
 
-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){