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/*
* Public key-based signature verification 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/error.h"
#include "polarssl/md.h"
#include "polarssl/pk.h"
#include "polarssl/sha1.h"
#if defined _MSC_VER && !defined snprintf
#define snprintf _snprintf
#endif
#if !defined(POLARSSL_BIGNUM_C) || \
!defined(POLARSSL_SHA1_C) || !defined(POLARSSL_PK_PARSE_C) || \
!defined(POLARSSL_FS_IO)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_BIGNUM_C and/or "
"POLARSSL_SHA1_C and/or POLARSSL_PK_PARSE_C and/or "
"POLARSSL_FS_IO not defined.\n");
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
FILE *f;
int ret = 1;
size_t i;
pk_context pk;
unsigned char hash[20];
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
char filename[512];
pk_init( &pk );
if( argc != 3 )
{
printf( "usage: pk_verify <key_file> <filename>\n" );
#if defined(_WIN32)
printf( "\n" );
#endif
goto exit;
}
printf( "\n . Reading public key from '%s'", argv[1] );
fflush( stdout );
if( ( ret = pk_parse_public_keyfile( &pk, argv[1] ) ) != 0 )
{
printf( " failed\n ! pk_parse_public_keyfile returned -0x%04x\n", -ret );
goto exit;
}
/*
* Extract the signature from the text file
*/
ret = 1;
snprintf( filename, sizeof(filename), "%s.sig", argv[2] );
if( ( f = fopen( filename, "rb" ) ) == NULL )
{
printf( "\n ! Could not open %s\n\n", filename );
goto exit;
}
i = fread( buf, 1, sizeof(buf), f );
fclose( f );
/*
* Compute the SHA-1 hash of the input file and compare
* it with the hash decrypted from the signature.
*/
printf( "\n . Verifying the SHA-1 signature" );
fflush( stdout );
if( ( ret = sha1_file( argv[2], hash ) ) != 0 )
{
printf( " failed\n ! Could not open or read %s\n\n", argv[2] );
goto exit;
}
if( ( ret = pk_verify( &pk, POLARSSL_MD_SHA1, hash, 0,
buf, i ) ) != 0 )
{
printf( " failed\n ! pk_verify returned -0x%04x\n", -ret );
goto exit;
}
printf( "\n . OK (the decrypted SHA-1 hash matches)\n\n" );
ret = 0;
exit:
pk_free( &pk );
#if defined(POLARSSL_ERROR_C)
polarssl_strerror( ret, (char *) buf, sizeof(buf) );
printf( " ! Last error was: %s\n", buf );
#endif
#if defined(_WIN32)
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_BIGNUM_C && POLARSSL_SHA1_C &&
POLARSSL_PK_PARSE_C && POLARSSL_FS_IO */
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