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ewf_hash.c
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ewf_hash.c
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/*
* EWF hash section
*
* Copyright (c) 2006-2007, Joachim Metz <forensics@hoffmannbv.nl>,
* Hoffmann Investigations. All rights reserved.
*
* Refer to AUTHORS for acknowledgements.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the creator, related organisations, nor the names of
* its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* - All advertising materials mentioning features or use of this software
* must acknowledge the contribution by people stated in the acknowledgements.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER, COMPANY AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "libewf_includes.h"
#include "libewf_common.h"
#include "libewf_endian.h"
#include "libewf_notify.h"
#include "ewf_crc.h"
#include "ewf_hash.h"
/* Reads the hash from a file descriptor
* Returns the amount of bytes read, or -1 on error
*/
ssize_t ewf_hash_read( EWF_HASH *hash, int file_descriptor )
{
ssize_t count = 0;
size_t size = EWF_HASH_SIZE;
if( hash == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_hash_read: unable to create hash.\n" );
return( -1 );
}
count = libewf_common_read( file_descriptor, hash, size );
if( count < (ssize_t) size )
{
LIBEWF_WARNING_PRINT( "ewf_hash_read: unable to read hash.\n" );
return( -1 );
}
return( count );
}
/* Writes the hash to a file descriptor
* Returns the amount of bytes written, or -1 on error
*/
ssize_t ewf_hash_write( EWF_HASH *hash, int file_descriptor )
{
EWF_CRC crc = 0;
ssize_t count = 0;
size_t size = EWF_HASH_SIZE;
if( hash == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_hash_write: invalid hash.\n" );
return( -1 );
}
if( ewf_crc_calculate( &crc, (uint8_t *) hash, ( size - EWF_CRC_SIZE ), 1 ) != 1 )
{
LIBEWF_WARNING_PRINT( "ewf_hash_write: unable to calculate CRC.\n" );
return( -1 );
}
if( libewf_endian_revert_32bit( crc, hash->crc ) != 1 )
{
LIBEWF_WARNING_PRINT( "ewf_hash_write: unable to revert CRC value.\n" );
return( -1 );
}
count = libewf_common_write( file_descriptor, hash, size );
if( count < (ssize_t) size )
{
LIBEWF_WARNING_PRINT( "ewf_hash_write: unable to write hash.\n" );
return( -1 );
}
return( count );
}

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ewf_hash.c (3 KB)

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