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/*
* Crypographic digest hash
*
* Copyright (C) 2018-2024, Joachim Metz <joachim.metz@gmail.com>
*
* Refer to AUTHORS for acknowledgements.
*
* This program 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 3 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 Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <types.h>
#include "digest_hash.h"
#include "fsapfstools_libcerror.h"
/* Converts the digest hash to a printable string
* Returns 1 if successful or -1 on error
*/
int digest_hash_copy_to_string(
const uint8_t *digest_hash,
size_t digest_hash_size,
char *string,
size_t string_size,
libcerror_error_t **error )
{
static char *function = "digest_hash_copy_to_string";
size_t string_iterator = 0;
size_t digest_hash_iterator = 0;
uint8_t digest_digit = 0;
if( digest_hash == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid digest hash.",
function );
return( -1 );
}
if( digest_hash_size > (size_t) SSIZE_MAX )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid digest hash size value exceeds maximum.",
function );
return( -1 );
}
if( string == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid string.",
function );
return( -1 );
}
if( string_size > (size_t) SSIZE_MAX )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,
"%s: invalid string size value exceeds maximum.",
function );
return( -1 );
}
/* The string requires space for 2 characters per digest hash digit and a end of string
*/
if( string_size < ( ( 2 * digest_hash_size ) + 1 ) )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_VALUE_TOO_SMALL,
"%s: string too small.",
function );
return( -1 );
}
for( digest_hash_iterator = 0;
digest_hash_iterator < digest_hash_size;
digest_hash_iterator++ )
{
digest_digit = digest_hash[ digest_hash_iterator ] / 16;
if( digest_digit <= 9 )
{
string[ string_iterator++ ] = (char) ( (uint8_t) '0' + digest_digit );
}
else
{
string[ string_iterator++ ] = (char) ( (uint8_t) 'a' + ( digest_digit - 10 ) );
}
digest_digit = digest_hash[ digest_hash_iterator ] % 16;
if( digest_digit <= 9 )
{
string[ string_iterator++ ] = (char) ( (uint8_t) '0' + digest_digit );
}
else
{
string[ string_iterator++ ] = (char) ( (uint8_t) 'a' + ( digest_digit - 10 ) );
}
}
string[ string_iterator ] = 0;
return( 1 );
}
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