/* hmac.h
 *
 * Copyright (C) 2006-2018 wolfSSL Inc.  All rights reserved.
 *
 * This file is part of wolfSSL.
 *
 * wolfSSL is distributed in binary form as licensed by Espressif Systems.
 * See README file or contact licensing@wolfssl.com with any questions or comments.
 *
 * https://www.wolfssl.com
 */


/*!
    \file wolfssl/wolfcrypt/hmac.h
*/

#ifndef NO_HMAC

#ifndef WOLF_CRYPT_HMAC_H
#define WOLF_CRYPT_HMAC_H

#include <wolfssl/wolfcrypt/hash.h>

#if defined(HAVE_FIPS) && \
	(!defined(HAVE_FIPS_VERSION) || (HAVE_FIPS_VERSION < 2))
/* for fips @wc_fips */
    #include <cyassl/ctaocrypt/hmac.h>
    #define WC_HMAC_BLOCK_SIZE HMAC_BLOCK_SIZE
#endif


#if defined(HAVE_FIPS) && \
	defined(HAVE_FIPS_VERSION) && (HAVE_FIPS_VERSION >= 2)
	#include <wolfssl/wolfcrypt/fips.h>
#endif

#ifdef __cplusplus
    extern "C" {
#endif

/* avoid redefinition of structs */
#if !defined(HAVE_FIPS) || \
    (defined(HAVE_FIPS_VERSION) && (HAVE_FIPS_VERSION >= 2))

#ifdef WOLFSSL_ASYNC_CRYPT
    #include <wolfssl/wolfcrypt/async.h>
#endif

#ifndef NO_OLD_WC_NAMES
    #define HMAC_BLOCK_SIZE WC_HMAC_BLOCK_SIZE
#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
    WC_MD5     = WC_HASH_TYPE_MD5,
#endif
#ifdef NO_SHA
    WC_SHA     = WC_HASH_TYPE_SHA,
#endif
#ifdef NO_SHA256
    WC_SHA256  = WC_HASH_TYPE_SHA256,
#endif
#ifndef WOLFSSL_SHA512
    WC_SHA512  = WC_HASH_TYPE_SHA512,
#endif
#ifndef WOLFSSL_SHA384
    WC_SHA384  = WC_HASH_TYPE_SHA384,
#endif
#ifndef HAVE_BLAKE2
    BLAKE2B_ID = WC_HASH_TYPE_BLAKE2B,
#endif
#ifndef WOLFSSL_SHA224
    WC_SHA224  = WC_HASH_TYPE_SHA224,
#endif
#ifndef WOLFSSL_SHA3
    WC_SHA3_224 = WC_HASH_TYPE_SHA3_224,
    WC_SHA3_256 = WC_HASH_TYPE_SHA3_256,
    WC_SHA3_384 = WC_HASH_TYPE_SHA3_384,
    WC_SHA3_512 = WC_HASH_TYPE_SHA3_512,
#endif
};

/* Select the largest available hash for the buffer size. */
#define WC_HMAC_BLOCK_SIZE WC_MAX_BLOCK_SIZE

#if !defined(WOLFSSL_SHA3) && !defined(WOLFSSL_SHA512) && !defined(HAVE_BLAKE2) && \
    !defined(WOLFSSL_SHA384) && defined(NO_SHA256) && defined(WOLFSSL_SHA224) && \
     defined(NO_SHA) && defined(NO_MD5)
    #error "You have to have some kind of hash if you want to use HMAC."
#endif


/* hash union */
typedef union {
#ifndef NO_MD5
    wc_Md5 md5;
#endif
#ifndef NO_SHA
    wc_Sha sha;
#endif
#ifdef WOLFSSL_SHA224
    wc_Sha224 sha224;
#endif
#ifndef NO_SHA256
    wc_Sha256 sha256;
#endif
#ifdef WOLFSSL_SHA384
    wc_Sha384 sha384;
#endif
#ifdef WOLFSSL_SHA512
    wc_Sha512 sha512;
#endif
#ifdef HAVE_BLAKE2
    Blake2b blake2b;
#endif
#ifdef WOLFSSL_SHA3
    wc_Sha3 sha3;
#endif
} Hash;

/* Hmac digest */
typedef struct Hmac {
    Hash    hash;
    word32  ipad[WC_HMAC_BLOCK_SIZE  / sizeof(word32)];  /* same block size all*/
    word32  opad[WC_HMAC_BLOCK_SIZE  / sizeof(word32)];
    word32  innerHash[WC_MAX_DIGEST_SIZE / sizeof(word32)];
    void*   heap;                 /* heap hint */
    byte    macType;              /* md5 sha or sha256 */
    byte    innerHashKeyed;       /* keyed flag */

#ifdef WOLFSSL_ASYNC_CRYPT
    WC_ASYNC_DEV asyncDev;
    word16       keyLen;          /* hmac key length (key in ipad) */
#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);

WOLFSSL_API int wc_HmacInit(Hmac* hmac, void* heap, int devId);
WOLFSSL_API void wc_HmacFree(Hmac*);

WOLFSSL_API int wolfSSL_GetHmacMaxSize(void);

WOLFSSL_LOCAL int _InitHmac(Hmac* hmac, int type, void* heap);

#ifdef HAVE_HKDF

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

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 */

