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/* ctc_hmac.h
*
* Copyright (C) 2006-2011 Sawtooth Consulting Ltd.
*
* This file is part of CyaSSL.
*
* CyaSSL 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 2 of the License, or
* (at your option) any later version.
*
* CyaSSL 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifndef NO_HMAC
#ifndef CTAO_CRYPT_HMAC_H
#define CTAO_CRYPT_HMAC_H
#include "ctc_md5.h"
#include "ctc_sha.h"
#ifndef NO_SHA256
#include "sha256.h"
#endif
#ifdef __cplusplus
extern "C" {
#endif
enum {
IPAD = 0x36,
OPAD = 0x5C,
#ifndef NO_SHA256
INNER_HASH_SIZE = SHA256_DIGEST_SIZE,
#else
INNER_HASH_SIZE = SHA_DIGEST_SIZE,
SHA256 = 2, /* hash type unique */
#endif
HMAC_BLOCK_SIZE = MD5_BLOCK_SIZE
};
/* hash union */
typedef union {
Md5 md5;
Sha sha;
#ifndef NO_SHA256
Sha256 sha256;
#endif
} Hash;
/* Hmac digest */
typedef struct Hmac {
Hash hash;
word32 ipad[HMAC_BLOCK_SIZE / sizeof(word32)]; /* same block size all*/
word32 opad[HMAC_BLOCK_SIZE / sizeof(word32)];
word32 innerHash[INNER_HASH_SIZE / sizeof(word32)]; /* max size */
byte macType; /* md5 sha or sha256 */
byte innerHashKeyed; /* keyed flag */
} Hmac;
void HmacSetKey(Hmac*, int type, const byte* key, word32 keySz); /* does init */
void HmacUpdate(Hmac*, const byte*, word32);
void HmacFinal(Hmac*, byte*);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* CTAO_CRYPT_HMAC_H */
#endif /* NO_HMAC */
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