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/*
* Copyright (c) 2000, 2001, 2002 Virtual Unlimited B.V.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*!\file sha256.h
* \brief SHA-256 hash function, headers.
* \author Bob Deblier <bob.deblier@pandora.be>
* \ingroup HASH_m HASH_sha256_m
*/
#ifndef _SHA256_H
#define _SHA256_H
#include "beecrypt/beecrypt.h"
/*!\brief Holds all the parameters necessary for the SHA-256 algorithm.
* \ingroup HASH_sha256_m
*/
#ifdef __cplusplus
struct BEECRYPTAPI sha256Param
#else
struct _sha256Param
#endif
{
/*!\var h
*/
uint32_t h[8];
/*!\var data
*/
uint32_t data[64];
/*!\var length
* \brief Multi-precision integer counter for the bits that have been
* processed so far.
*/
#if (MP_WBITS == 64)
mpw length[1];
#elif (MP_WBITS == 32)
mpw length[2];
#else
# error
#endif
/*!\var offset
* \brief Offset into \a data; points to the place where new data will be
* copied before it is processed.
*/
uint32_t offset;
};
#ifndef __cplusplus
typedef struct _sha256Param sha256Param;
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*!\var sha256
* \brief Holds the full API description of the SHA-256 algorithm.
*/
extern BEECRYPTAPI const hashFunction sha256;
/*!\fn void sha256Process(sha256Param* sp)
* \brief This function performs the core of the SHA-256 hash algorithm; it
* processes a block of 64 bytes.
* \param sp The hash function's parameter block.
*/
BEECRYPTAPI
void sha256Process(sha256Param* sp);
/*!\fn int sha256Reset(sha256Param* sp)
* \brief This function resets the parameter block so that it's ready for a
* new hash.
* \param sp The hash function's parameter block.
* \retval 0 on success.
*/
BEECRYPTAPI
int sha256Reset (sha256Param* sp);
/*!\fn int sha256Update(sha256Param* sp, const byte* data, size_t size)
* \brief This function should be used to pass successive blocks of data
* to be hashed.
* \param sp The hash function's parameter block.
* \param data
* \param size
* \retval 0 on success.
*/
BEECRYPTAPI
int sha256Update (sha256Param* sp, const byte* data, size_t size);
/*!\fn int sha256Digest(sha256Param* sp, byte* digest)
* \brief This function finishes the current hash computation and copies
* the digest value into \a digest.
* \param sp The hash function's parameter block.
* \param digest The place to store the 32-byte digest.
* \retval 0 on success.
*/
BEECRYPTAPI
int sha256Digest (sha256Param* sp, byte* digest);
#ifdef __cplusplus
}
#endif
#endif
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