ctc_hmac.h

00001 /* ctc_hmac.h
00002  *
00003  * Copyright (C) 2006-2009 Sawtooth Consulting Ltd.
00004  *
00005  * This file is part of CyaSSL.
00006  *
00007  * CyaSSL is free software; you can redistribute it and/or modify
00008  * it under the terms of the GNU General Public License as published by
00009  * the Free Software Foundation; either version 2 of the License, or
00010  * (at your option) any later version.
00011  *
00012  * CyaSSL is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
00020  */
00021 
00022 #ifndef NO_HMAC
00023 
00024 #ifndef CTAO_CRYPT_HMAC_H
00025 #define CTAO_CRYPT_HMAC_H
00026 
00027 #include "ctc_md5.h"
00028 #include "ctc_sha.h"
00029 
00030 #ifndef NO_SHA256
00031     #include "sha256.h"
00032 #endif
00033 
00034 #ifdef __cplusplus
00035     extern "C" {
00036 #endif
00037 
00038 
00039 
00040 enum {
00041     IPAD    = 0x36,
00042     OPAD    = 0x5C,
00043 #ifndef NO_SHA256
00044     INNER_HASH_SIZE = SHA256_DIGEST_SIZE,
00045 #else
00046     INNER_HASH_SIZE = SHA_DIGEST_SIZE,
00047     SHA256          = 2,                     /* hash type unique */
00048 #endif
00049     HMAC_BLOCK_SIZE = MD5_BLOCK_SIZE
00050 };
00051 
00052 
00053 /* hash union */
00054 typedef union {
00055     Md5 md5;
00056     Sha sha;
00057     #ifndef NO_SHA256
00058         Sha256 sha256;
00059     #endif
00060 } Hash;
00061 
00062 /* Hmac digest */
00063 typedef struct Hmac {
00064     Hash    hash;
00065     word32  ipad[HMAC_BLOCK_SIZE  / sizeof(word32)];  /* same block size all*/
00066     word32  opad[HMAC_BLOCK_SIZE  / sizeof(word32)];
00067     word32  innerHash[INNER_HASH_SIZE / sizeof(word32)]; /* max size */
00068     byte    macType;                                     /* md5 sha or sha256 */
00069     byte    innerHashKeyed;                              /* keyed flag */
00070 } Hmac;
00071 
00072 
00073 void HmacSetKey(Hmac*, int type, const byte* key, word32 keySz); /* does init */
00074 void HmacUpdate(Hmac*, const byte*, word32);
00075 void HmacFinal(Hmac*, byte*);
00076 
00077 
00078 #ifdef __cplusplus
00079     } /* extern "C" */
00080 #endif
00081 
00082 #endif /* CTAO_CRYPT_HMAC_H */
00083 
00084 #endif /* NO_HMAC */
00085