/* hmac.h
 *
 * Copyright (C) 2006-2016 wolfSSL Inc.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL 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.
 *
 * wolfSSL 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
 */



#ifndef NO_HMAC

#ifndef WOLF_CRYPT_HMAC_H
#define WOLF_CRYPT_HMAC_H

#include <wolfssl/wolfcrypt/types.h>

#ifndef NO_MD5
    #include <wolfssl/wolfcrypt/md5.h>
#endif

#ifndef NO_SHA
    #include <wolfssl/wolfcrypt/sha.h>
#endif

#if !defined(NO_SHA256) || defined(WOLFSSL_SHA224)
    #include <wolfssl/wolfcrypt/sha256.h>
#endif

#ifdef WOLFSSL_SHA512
    #include <wolfssl/wolfcrypt/sha512.h>
#endif

#ifdef HAVE_BLAKE2
    #include <wolfssl/wolfcrypt/blake2.h>
#endif

#ifdef HAVE_FIPS
/* for fips */
    #include <cyassl/ctaocrypt/hmac.h>
#endif


#ifdef __cplusplus
    extern "C" {
#endif
#ifndef HAVE_FIPS
        
#ifdef WOLFSSL_ASYNC_CRYPT
    #include <wolfssl/wolfcrypt/async.h>
#endif

enum {
    HMAC_FIPS_MIN_KEY = 14,   /* 112 bit key length minimum */

    IPAD    = 0x36,
    OPAD    = 0x5C,

/* If any hash is not enabled, add the ID here. */
#ifdef NO_MD5
    MD5     = 0,
#endif
#ifdef NO_SHA
    SHA     = 1,
#endif
#ifdef NO_SHA256
    SHA256  = 2,
#endif
#ifndef WOLFSSL_SHA512
    SHA512  = 4,
#endif
#ifndef WOLFSSL_SHA384
    SHA384  = 5,
#endif
#ifndef HAVE_BLAKE2
    BLAKE2B_ID = 7,
#endif
#ifndef WOLFSSL_SHA224
    SHA224  = 8,
#endif

/* Select the largest available hash for the buffer size. */
#if defined(WOLFSSL_SHA512)
    MAX_DIGEST_SIZE = SHA512_DIGEST_SIZE,
    HMAC_BLOCK_SIZE = SHA512_BLOCK_SIZE
#elif defined(HAVE_BLAKE2)
    MAX_DIGEST_SIZE = BLAKE2B_OUTBYTES,
    HMAC_BLOCK_SIZE = BLAKE2B_BLOCKBYTES,
#elif defined(WOLFSSL_SHA384)
    MAX_DIGEST_SIZE = SHA384_DIGEST_SIZE,
    HMAC_BLOCK_SIZE = SHA384_BLOCK_SIZE
#elif !defined(NO_SHA256)
    MAX_DIGEST_SIZE = SHA256_DIGEST_SIZE,
    HMAC_BLOCK_SIZE = SHA256_BLOCK_SIZE
#elif defined(WOLFSSL_SHA224)
    MAX_DIGEST_SIZE = SHA224_DIGEST_SIZE,
    HMAC_BLOCK_SIZE = SHA224_BLOCK_SIZE
#elif !defined(NO_SHA)
    MAX_DIGEST_SIZE = SHA_DIGEST_SIZE,
    HMAC_BLOCK_SIZE = SHA_BLOCK_SIZE
#elif !defined(NO_MD5)
    MAX_DIGEST_SIZE = MD5_DIGEST_SIZE,
    HMAC_BLOCK_SIZE = MD5_BLOCK_SIZE
#else
    #error "You have to have some kind of hash if you want to use HMAC."
#endif
};


/* hash union */
typedef union {
    #ifndef NO_MD5
        Md5 md5;
    #endif
    #ifndef NO_SHA
        Sha sha;
    #endif
    #ifdef WOLFSSL_SHA224
        Sha224 sha224;
    #endif
    #ifndef NO_SHA256
        Sha256 sha256;
    #endif
    #ifdef WOLFSSL_SHA384
        Sha384 sha384;
    #endif
    #ifdef WOLFSSL_SHA512
        Sha512 sha512;
    #endif
    #ifdef HAVE_BLAKE2
        Blake2b blake2b;
    #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[MAX_DIGEST_SIZE / sizeof(word32)];
    void*   heap;                 /* heap hint */
    byte    macType;              /* md5 sha or sha256 */
    byte    innerHashKeyed;       /* keyed flag */
#ifdef WOLFSSL_ASYNC_CRYPT
    AsyncCryptDev asyncDev;
    #ifdef HAVE_CAVIUM
        word16   keyLen;          /* hmac key length */
        word16   dataLen;
        HashType type;            /* hmac key type */
        byte*    data;            /* buffered input data for one call */
    #endif /* HAVE_CAVIUM */
#endif /* WOLFSSL_ASYNC_CRYPT */
} Hmac;

#endif /* HAVE_FIPS */

/* does init */
WOLFSSL_API int wc_HmacSetKey(Hmac*, int type, const byte* key, word32 keySz);
WOLFSSL_API int wc_HmacUpdate(Hmac*, const byte*, word32);
WOLFSSL_API int wc_HmacFinal(Hmac*, byte*);
WOLFSSL_API int wc_HmacSizeByType(int type);
#ifdef WOLFSSL_ASYNC_CRYPT
    WOLFSSL_API int  wc_HmacAsyncInit(Hmac*, int);
    WOLFSSL_API void wc_HmacAsyncFree(Hmac*);
#endif



WOLFSSL_API int wolfSSL_GetHmacMaxSize(void);


#ifdef HAVE_HKDF

WOLFSSL_API int wc_HKDF(int type, const byte* inKey, word32 inKeySz,
                    const byte* salt, word32 saltSz,
                    const byte* info, word32 infoSz,
                    byte* out, word32 outSz);

#endif /* HAVE_HKDF */

#ifdef __cplusplus
    } /* extern "C" */
#endif

#endif /* WOLF_CRYPT_HMAC_H */

#endif /* NO_HMAC */

