X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=md5.c;h=1c87b53f6e9510e0e3592a7123720dc9e03ac4f2;hb=6bd58d7909b89a3e05003a63cdc642638fa653e6;hp=5ae22e60dbc1a4fc879caea2b684f895711efe45;hpb=24a9a8cfc423d4bfc2ce4b5fba8ebf5eb372938e;p=avr-crypto-lib.git

diff --git a/md5.c b/md5.c
index 5ae22e6..1c87b53 100644
--- a/md5.c
+++ b/md5.c
@@ -1,9 +1,28 @@
+/* md5.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:	md5.h
- * Author:	Daniel Otte
- * Date: 	31.07.2006
- * License: GPL
- * Description: Implementation of the MD5 hash algorithm as described in RFC 1321
+ * \file	md5.c
+ * \author	Daniel Otte
+ * \date 	2006-07-31
+ * \par License:
+ * GPLv3 or later
+ * \brief Implementation of the MD5 hash algorithm as described in RFC 1321
  * 
  */
 
@@ -113,32 +132,32 @@ void md5_nextBlock(md5_ctx_t *state, void* block){
 	state->counter++;
 }
 
-void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length){
+void md5_lastBlock(md5_ctx_t *state, void* block, uint16_t length_b){
 	uint16_t l;
 	uint8_t b[64];
-	while (length >= 512){
+	while (length_b >= 512){
 		md5_nextBlock(state, block);
-		length -= 512;
-		block += 512/8;
+		length_b -= 512;
+		block = ((uint8_t*)block) + 512/8;
 	}
 	memset(b, 0, 64);
-	memcpy(b, block, length/8);
+	memcpy(b, block, length_b/8);
 	/* insert padding one */
-	l=length/8;
-	if(length%8){
+	l=length_b/8;
+	if(length_b%8){
 		uint8_t t;
 		t = ((uint8_t*)block)[l];
-		t |= (0x80>>(length%8));
+		t |= (0x80>>(length_b%8));
 		b[l]=t;
 	}else{
 		b[l]=0x80;
 	}
 	/* insert length value */
-	if(l+sizeof(uint64_t) > 512/8){
+	if(l+sizeof(uint64_t) >= 512/8){
 		md5_nextBlock(state, b);
 		state->counter--;
 		memset(b, 0, 64);
 	}
-	*((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length;
+	*((uint64_t*)&b[64-sizeof(uint64_t)]) = (state->counter * 512) + length_b;
 	md5_nextBlock(state, b);
 }