X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=hmac-sha256.c;h=c57ba95becb42b71b83ee4cb25d310462cc3f108;hb=96ebafd201c9e8441c7677577b24aa402c1defc6;hp=e6fe3bc5bf18c1778aef59bcaa41f90b1cd61b69;hpb=38806fc75038026e167a26eff90b6111066a3642;p=avr-crypto-lib.git

diff --git a/hmac-sha256.c b/hmac-sha256.c
index e6fe3bc..c57ba95 100644
--- a/hmac-sha256.c
+++ b/hmac-sha256.c
@@ -1,3 +1,21 @@
+/* hmac-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/>.
+*/
 /**
  * 
  * implementation of HMAC as described in RFC2104
@@ -12,6 +30,7 @@
 
 #include <stdint.h>
 #include <string.h>
+#include "config.h"
 #include "sha256.h"
 
 #define IPAD 0x36
@@ -19,14 +38,17 @@
 
 typedef sha256_ctx_t hmac_sha256_ctx_t;
 
+#ifndef HMAC_SHORTONLY
+
 void hmac_sha256_init(hmac_sha256_ctx_t *s, void* key, uint16_t kl){
 	uint8_t buffer[SHA256_BLOCK_BITS/8];
 	uint8_t i;
 	
+	memset(buffer, 0, SHA256_BLOCK_BITS/8);
 	if (kl > SHA256_BLOCK_BITS){
 		sha256((void*)buffer, key, kl);
 	} else {
-		memcpy(buffer, key, kl/8 + (kl & 0x7)?1:0);
+		memcpy(buffer, key, (kl+7)/8);
 	}
 	
 	for (i=0; i<SHA256_BLOCK_BITS/8; ++i){
@@ -45,10 +67,11 @@ void hmac_sha256_final(hmac_sha256_ctx_t *s, void* key, uint16_t kl){
 	uint8_t i;
 	sha256_ctx_t a;
 	
+	memset(buffer, 0, SHA256_BLOCK_BITS/8);
 	if (kl > SHA256_BLOCK_BITS){
 		sha256((void*)buffer, key, kl);
 	} else {
-		memcpy(buffer, key, kl/8 + (kl & 0x7)?1:0);
+		memcpy(buffer, key, (kl+7)/8);
 	}
 	
 	for (i=0; i<SHA256_BLOCK_BITS/8; ++i){
@@ -58,13 +81,16 @@ void hmac_sha256_final(hmac_sha256_ctx_t *s, void* key, uint16_t kl){
 	sha256_init(&a);
 	sha256_nextBlock(&a, buffer); /* hash key ^ opad */
 	sha256_ctx2hash((void*)buffer, s);  /* copy hash(key ^ ipad, msg) to buffer */
-	sha256_lastBlock(s, buffer, SHA256_HASH_BITS);
+	sha256_lastBlock(&a, buffer, SHA256_HASH_BITS);
+	memcpy(s, &a, sizeof(sha256_ctx_t));
 #if defined SECURE_WIPE_BUFFER
 	memset(buffer, 0, SHA256_BLOCK_BITS/8);
 	memset(a.h, 0, 8*4);
 #endif	
 }
 
+#endif
+
 /*
 void hmac_sha256_nextBlock()
 void hmac_sha256_lastBlock()
@@ -85,7 +111,7 @@ void hmac_sha256(void* dest, void* key, uint16_t kl, void* msg, uint64_t ml){ /*
 	if (kl > SHA256_BLOCK_BITS){
 		sha256((void*)buffer, key, kl);
 	} else {
-		memcpy(buffer, key, kl/8 + (kl & 0x7)?1:0);
+		memcpy(buffer, key, (kl+7)/8);
 	}
 	
 	for (i=0; i<SHA256_BLOCK_BITS/8; ++i){
@@ -95,7 +121,7 @@ void hmac_sha256(void* dest, void* key, uint16_t kl, void* msg, uint64_t ml){ /*
 	sha256_nextBlock(&s, buffer);
 	while (ml >= SHA256_BLOCK_BITS){
 		sha256_nextBlock(&s, msg);
-		msg += SHA256_BLOCK_BITS/8;
+		msg = (uint8_t*)msg + SHA256_BLOCK_BITS/8;
 		ml -=  SHA256_BLOCK_BITS;
 	}
 	sha256_lastBlock(&s, msg, ml);