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/*
* sha256sum demonstration program
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* 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
#include <string.h>
#include <stdio.h>
#include "polarssl/sha256.h"
#if !defined(POLARSSL_SHA256_C) || !defined(POLARSSL_FS_IO)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_SHA256_C and/or POLARSSL_FS_IO not defined.\n");
return( 0 );
}
#else
static int sha256_wrapper( char *filename, unsigned char *sum )
{
int ret = sha256_file( filename, sum, 0 );
if( ret == 1 )
fprintf( stderr, "failed to open: %s\n", filename );
if( ret == 2 )
fprintf( stderr, "failed to read: %s\n", filename );
return( ret );
}
static int sha256_print( char *filename )
{
int i;
unsigned char sum[32];
if( sha256_wrapper( filename, sum ) != 0 )
return( 1 );
for( i = 0; i < 32; i++ )
printf( "%02x", sum[i] );
printf( " %s\n", filename );
return( 0 );
}
static int sha256_check( char *filename )
{
int i;
size_t n;
FILE *f;
int nb_err1, nb_err2;
int nb_tot1, nb_tot2;
unsigned char sum[32];
char buf[65], line[1024];
char diff;
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
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 < 68 )
continue;
if( line[64] != ' ' || line[65] != ' ' )
continue;
if( line[n - 1] == '\n' ) { n--; line[n] = '\0'; }
if( line[n - 1] == '\r' ) { n--; line[n] = '\0'; }
nb_tot1++;
if( sha256_wrapper( line + 66, sum ) != 0 )
{
nb_err1++;
continue;
}
nb_tot2++;
for( i = 0; i < 32; i++ )
sprintf( buf + i * 2, "%02x", sum[i] );
/* Use constant-time buffer comparison */
diff = 0;
for( i = 0; i < 64; i++ )
diff |= line[i] ^ buf[i];
if( diff != 0 )
{
nb_err2++;
fprintf( stderr, "wrong checksum: %s\n", line + 66 );
}
n = sizeof( line );
}
fclose( f );
if( nb_err1 != 0 )
{
printf( "WARNING: %d (out of %d) input files could "
"not be read\n", nb_err1, nb_tot1 );
}
if( nb_err2 != 0 )
{
printf( "WARNING: %d (out of %d) computed checksums did "
"not match\n", nb_err2, nb_tot2 );
}
return( nb_err1 != 0 || nb_err2 != 0 );
}
int main( int argc, char *argv[] )
{
int ret, i;
if( argc == 1 )
{
printf( "print mode: sha256sum <file> <file> ...\n" );
printf( "check mode: sha256sum -c <checksum file>\n" );
#if defined(_WIN32)
printf( "\n Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( 1 );
}
if( argc == 3 && strcmp( "-c", argv[1] ) == 0 )
return( sha256_check( argv[2] ) );
ret = 0;
for( i = 1; i < argc; i++ )
ret |= sha256_print( argv[i] );
return( ret );
}
#endif /* POLARSSL_SHA256_C && POLARSSL_FS_IO */
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