X-Git-Url: https://git.cryptolib.org/?a=blobdiff_plain;f=hmac-sha256.c;h=c57ba95becb42b71b83ee4cb25d310462cc3f108;hb=96ebafd201c9e8441c7677577b24aa402c1defc6;hp=714933f8cda7a4ea48b59e9f42f57d37f65ed842;hpb=639b9bea16571c3f3a901cefc4bca48f84b09705;p=avr-crypto-lib.git
diff --git a/hmac-sha256.c b/hmac-sha256.c
index 714933f..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 .
+*/
/**
*
* implementation of HMAC as described in RFC2104
@@ -26,10 +44,11 @@ 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+7/8));
+ memcpy(buffer, key, (kl+7)/8);
}
for (i=0; i SHA256_BLOCK_BITS){
sha256((void*)buffer, key, kl);
} else {
@@ -61,7 +81,8 @@ 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);