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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.h"
/** \ingroup HASH_sha256_m
*/
typedef struct
{
uint32_t h[8];
uint32_t data[64];
#if (MP_WBITS == 64)
mpw length[1];
#elif (MP_WBITS == 32)
mpw length[2];
#else
# error
#endif
uint32_t offset;
} sha256Param;
#ifdef __cplusplus
extern "C" {
#endif
/** \ingroup HASH_sha256_m
* Holds the full API description of the SHA-256 algorithm.
*/
/*@observer@*/ /*@checked@*/
extern BEECRYPTAPI const hashFunction sha256;
/*@-exportlocal@*/
/** \ingroup HASH_sha256_m
* This function performs the SHA-256 hash algorithm on 64 byte blocks of data.
* @param sp hash parameter block
*/
BEECRYPTAPI
void sha256Process(sha256Param* sp)
/*@globals internalState @*/
/*@modifies sp, internalState @*/;
/** \ingroup HASH_sha256_m
* This function resets the parameter block so that it's ready for a new hash.
* @param sp hash parameter block
* @return 0 on success
*/
BEECRYPTAPI
int sha256Reset (sha256Param* sp)
/*@modifies sp @*/;
/** \ingroup HASH_sha256_m
* This function should be used to pass successive blocks of data to be hashed.
* @param sp hash parameter block
* @param *data bytes to hash
* @param size no. of bytes to hash
* @return 0 on success
*/
BEECRYPTAPI
int sha256Update (sha256Param* sp, const byte* data, size_t size)
/*@globals internalState @*/
/*@modifies sp, internalState @*/;
/** \ingroup HASH_sha256_m
* This function finishes the current hash computation, returning the digest
* value in \a digest.
* @param sp hash parameter block
* @retval *digest 32 byte SHA-256 digest
* @return 0 on success
*/
BEECRYPTAPI
int sha256Digest (sha256Param* sp, /*@out@*/ byte* digest)
/*@globals internalState @*/
/*@modifies sp, digest, internalState @*/;
/*@=exportlocal@*/
#ifdef __cplusplus
}
#endif
#endif
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