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/*
* generic message digest layer demonstration program
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#define mbedtls_exit exit
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */
#if defined(MBEDTLS_MD_C) && defined(MBEDTLS_FS_IO)
#include "mbedtls/md.h"
#include <stdio.h>
#include <string.h>
#endif
#if !defined(MBEDTLS_MD_C) || !defined(MBEDTLS_FS_IO)
int main( void )
{
mbedtls_printf("MBEDTLS_MD_C and/or MBEDTLS_FS_IO not defined.\n");
mbedtls_exit( 0 );
}
#else
static int generic_wrapper( const mbedtls_md_info_t *md_info, char *filename, unsigned char *sum )
{
int ret = mbedtls_md_file( md_info, filename, sum );
if( ret == 1 )
mbedtls_fprintf( stderr, "failed to open: %s\n", filename );
if( ret == 2 )
mbedtls_fprintf( stderr, "failed to read: %s\n", filename );
return( ret );
}
static int generic_print( const mbedtls_md_info_t *md_info, char *filename )
{
int i;
unsigned char sum[MBEDTLS_MD_MAX_SIZE];
if( generic_wrapper( md_info, filename, sum ) != 0 )
return( 1 );
for( i = 0; i < mbedtls_md_get_size( md_info ); i++ )
mbedtls_printf( "%02x", sum[i] );
mbedtls_printf( " %s\n", filename );
return( 0 );
}
static int generic_check( const mbedtls_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[MBEDTLS_MD_MAX_SIZE];
char line[1024];
char diff;
#if defined(__clang_analyzer__)
char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1] = { };
#else
char buf[MBEDTLS_MD_MAX_SIZE * 2 + 1];
#endif
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
mbedtls_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 * mbedtls_md_get_size( md_info ) + 4 )
{
mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name( md_info ));
continue;
}
if( line[2 * mbedtls_md_get_size( md_info )] != ' ' || line[2 * mbedtls_md_get_size( md_info ) + 1] != ' ' )
{
mbedtls_printf("No '%s' hash found on line.\n", mbedtls_md_get_name( md_info ));
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 * mbedtls_md_get_size( md_info ), sum ) != 0 )
{
nb_err1++;
continue;
}
nb_tot2++;
for( i = 0; i < mbedtls_md_get_size( md_info ); i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 2 * mbedtls_md_get_size( md_info ); i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
mbedtls_fprintf( stderr, "wrong checksum: %s\n", line + 66 );
}
n = sizeof( line );
}
if( nb_err1 != 0 )
{
mbedtls_printf( "WARNING: %d (out of %d) input files could "
"not be read\n", nb_err1, nb_tot1 );
}
if( nb_err2 != 0 )
{
mbedtls_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 = 1, i;
int exit_code = MBEDTLS_EXIT_FAILURE;
const mbedtls_md_info_t *md_info;
mbedtls_md_context_t md_ctx;
mbedtls_md_init( &md_ctx );
if( argc == 1 )
{
const int *list;
mbedtls_printf( "print mode: generic_sum <mbedtls_md> <file> <file> ...\n" );
mbedtls_printf( "check mode: generic_sum <mbedtls_md> -c <checksum file>\n" );
mbedtls_printf( "\nAvailable message digests:\n" );
list = mbedtls_md_list();
while( *list )
{
md_info = mbedtls_md_info_from_type( *list );
mbedtls_printf( " %s\n", mbedtls_md_get_name( md_info ) );
list++;
}
#if defined(_WIN32)
mbedtls_printf( "\n Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
mbedtls_exit( exit_code );
}
/*
* Read the MD from the command line
*/
md_info = mbedtls_md_info_from_string( argv[1] );
if( md_info == NULL )
{
mbedtls_fprintf( stderr, "Message Digest '%s' not found\n", argv[1] );
mbedtls_exit( exit_code );
}
if( mbedtls_md_setup( &md_ctx, md_info, 0 ) )
{
mbedtls_fprintf( stderr, "Failed to initialize context.\n" );
mbedtls_exit( exit_code );
}
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] );
if ( ret == 0 )
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
mbedtls_md_free( &md_ctx );
mbedtls_exit( exit_code );
}
#endif /* MBEDTLS_MD_C && MBEDTLS_FS_IO */
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