+/* 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
#include <stdint.h>
#include <string.h>
+#include "config.h"
#include "sha256.h"
#define IPAD 0x36
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){
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){
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()
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){