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/**
* \file sha4.h
*
* Copyright (C) 2011, Con Kolivas <kernel@kolivas.org>
* Copyright (C) 2006-2010, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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 2 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_SHA4_H
#define POLARSSL_SHA4_H

#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
#define int64 __int64
#else
#define UL64(x) x##ULL
#define int64 long long
#endif

/**
* \brief SHA-512 context structure
*/
typedef struct
{
    unsigned int64 total[2]; /*!< number of bytes processed */
    unsigned int64 state[8]; /*!< intermediate digest state */
    unsigned char buffer[128]; /*!< data block being processed */

    unsigned char ipad[128]; /*!< HMAC: inner padding */
    unsigned char opad[128]; /*!< HMAC: outer padding */
    int is384; /*!< 0 => SHA-512, else SHA-384 */
}
sha4_context;

#ifdef __cplusplus
extern "C" {
#endif

/**
* \brief SHA-512 context setup
*
* \param ctx context to be initialized
* \param is384 0 = use SHA512, 1 = use SHA384
*/
void sha4_starts( sha4_context *ctx, int is384 );

/**
* \brief SHA-512 process buffer
*
* \param ctx SHA-512 context
* \param input buffer holding the data
* \param ilen length of the input data
*/
void sha4_update( sha4_context *ctx, const unsigned char *input, int ilen );

/**
* \brief SHA-512 final digest
*
* \param ctx SHA-512 context
* \param output SHA-384/512 checksum result
*/
void sha4_finish( sha4_context *ctx, unsigned char output[64] );

/**
* \brief Output = SHA-512( input buffer )
*
* \param input buffer holding the data
* \param ilen length of the input data
* \param output SHA-384/512 checksum result
* \param is384 0 = use SHA512, 1 = use SHA384
*/
void sha4( const unsigned char *input, int ilen,
           unsigned char output[64], int is384 );

#ifdef __cplusplus
}
#endif

#endif /* sha4.h */
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