mbedtls/programs/hash/generic_sum.c

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/*
* generic message digest layer demonstration program
*
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* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
*
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* This file is part of mbed TLS (https://polarssl.org)
*
* 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.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#define polarssl_printf printf
#define polarssl_fprintf fprintf
#endif
#include <string.h>
#include <stdio.h>
#include "polarssl/md.h"
#if !defined(POLARSSL_MD_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
polarssl_printf("POLARSSL_MD_C not defined.\n");
return( 0 );
}
#else
static int generic_wrapper( const md_info_t *md_info, char *filename, unsigned char *sum )
{
int ret = md_file( md_info, filename, sum );
if( ret == 1 )
polarssl_fprintf( stderr, "failed to open: %s\n", filename );
if( ret == 2 )
polarssl_fprintf( stderr, "failed to read: %s\n", filename );
return( ret );
}
static int generic_print( const md_info_t *md_info, char *filename )
{
int i;
unsigned char sum[POLARSSL_MD_MAX_SIZE];
if( generic_wrapper( md_info, filename, sum ) != 0 )
return( 1 );
for( i = 0; i < md_info->size; i++ )
polarssl_printf( "%02x", sum[i] );
polarssl_printf( " %s\n", filename );
return( 0 );
}
static int generic_check( const md_info_t *md_info, char *filename )
{
int i;
size_t n;
FILE *f;
int nb_err1, nb_err2;
int nb_tot1, nb_tot2;
unsigned char sum[POLARSSL_MD_MAX_SIZE];
char buf[POLARSSL_MD_MAX_SIZE * 2 + 1], line[1024];
char diff;
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
polarssl_printf( "failed to open: %s\n", filename );
return( 1 );
}
nb_err1 = nb_err2 = 0;
nb_tot1 = nb_tot2 = 0;
memset( line, 0, sizeof( line ) );
n = sizeof( line );
while( fgets( line, (int) n - 1, f ) != NULL )
{
n = strlen( line );
if( n < (size_t) 2 * md_info->size + 4 )
{
polarssl_printf("No '%s' hash found on line.\n", md_info->name);
continue;
}
if( line[2 * md_info->size] != ' ' || line[2 * md_info->size + 1] != ' ' )
{
polarssl_printf("No '%s' hash found on line.\n", md_info->name);
continue;
}
if( line[n - 1] == '\n' ) { n--; line[n] = '\0'; }
if( line[n - 1] == '\r' ) { n--; line[n] = '\0'; }
nb_tot1++;
if( generic_wrapper( md_info, line + 2 + 2 * md_info->size, sum ) != 0 )
{
nb_err1++;
continue;
}
nb_tot2++;
for( i = 0; i < md_info->size; i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 2 * md_info->size; i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
polarssl_fprintf( stderr, "wrong checksum: %s\n", line + 66 );
}
n = sizeof( line );
}
if( nb_err1 != 0 )
{
polarssl_printf( "WARNING: %d (out of %d) input files could "
"not be read\n", nb_err1, nb_tot1 );
}
if( nb_err2 != 0 )
{
polarssl_printf( "WARNING: %d (out of %d) computed checksums did "
"not match\n", nb_err2, nb_tot2 );
}
fclose( f );
return( nb_err1 != 0 || nb_err2 != 0 );
}
int main( int argc, char *argv[] )
{
int ret, i;
const md_info_t *md_info;
md_context_t md_ctx;
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md_init( &md_ctx );
if( argc == 1 )
{
const int *list;
polarssl_printf( "print mode: generic_sum <md> <file> <file> ...\n" );
polarssl_printf( "check mode: generic_sum <md> -c <checksum file>\n" );
polarssl_printf( "\nAvailable message digests:\n" );
list = md_list();
while( *list )
{
md_info = md_info_from_type( *list );
polarssl_printf( " %s\n", md_info->name );
list++;
}
#if defined(_WIN32)
polarssl_printf( "\n Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( 1 );
}
/*
* Read the MD from the command line
*/
md_info = md_info_from_string( argv[1] );
if( md_info == NULL )
{
polarssl_fprintf( stderr, "Message Digest '%s' not found\n", argv[1] );
return( 1 );
}
if( md_init_ctx( &md_ctx, md_info) )
{
polarssl_fprintf( stderr, "Failed to initialize context.\n" );
return( 1 );
}
ret = 0;
if( argc == 4 && strcmp( "-c", argv[2] ) == 0 )
{
ret |= generic_check( md_info, argv[3] );
goto exit;
}
for( i = 2; i < argc; i++ )
ret |= generic_print( md_info, argv[i] );
exit:
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md_free( &md_ctx );
return( ret );
}
#endif /* POLARSSL_MD_C */