151 lines
3.8 KiB
C
151 lines
3.8 KiB
C
/*
|
|
* RSA/SHA-1 signature verification program
|
|
*
|
|
* Copyright (C) 2006-2011, 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.
|
|
*/
|
|
|
|
#include "polarssl/config.h"
|
|
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
#include "polarssl/rsa.h"
|
|
#include "polarssl/sha1.h"
|
|
|
|
#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_RSA_C) || \
|
|
!defined(POLARSSL_SHA1_C) || !defined(POLARSSL_FS_IO)
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
((void) argc);
|
|
((void) argv);
|
|
|
|
printf("POLARSSL_BIGNUM_C and/or POLARSSL_RSA_C and/or "
|
|
"POLARSSL_SHA1_C and/or POLARSSL_FS_IO not defined.\n");
|
|
return( 0 );
|
|
}
|
|
#else
|
|
int main( int argc, char *argv[] )
|
|
{
|
|
FILE *f;
|
|
int ret, c;
|
|
size_t i;
|
|
rsa_context rsa;
|
|
unsigned char hash[20];
|
|
unsigned char buf[POLARSSL_MPI_MAX_SIZE];
|
|
|
|
ret = 1;
|
|
if( argc != 2 )
|
|
{
|
|
printf( "usage: rsa_verify <filename>\n" );
|
|
|
|
#if defined(_WIN32)
|
|
printf( "\n" );
|
|
#endif
|
|
|
|
goto exit;
|
|
}
|
|
|
|
printf( "\n . Reading public key from rsa_pub.txt" );
|
|
fflush( stdout );
|
|
|
|
if( ( f = fopen( "rsa_pub.txt", "rb" ) ) == NULL )
|
|
{
|
|
printf( " failed\n ! Could not open rsa_pub.txt\n" \
|
|
" ! Please run rsa_genkey first\n\n" );
|
|
goto exit;
|
|
}
|
|
|
|
rsa_init( &rsa, RSA_PKCS_V15, 0 );
|
|
|
|
if( ( ret = mpi_read_file( &rsa.N, 16, f ) ) != 0 ||
|
|
( ret = mpi_read_file( &rsa.E, 16, f ) ) != 0 )
|
|
{
|
|
printf( " failed\n ! mpi_read_file returned %d\n\n", ret );
|
|
goto exit;
|
|
}
|
|
|
|
rsa.len = ( mpi_msb( &rsa.N ) + 7 ) >> 3;
|
|
|
|
fclose( f );
|
|
|
|
/*
|
|
* Extract the RSA signature from the text file
|
|
*/
|
|
ret = 1;
|
|
i = strlen( argv[1] );
|
|
memcpy( argv[1] + i, ".sig", 5 );
|
|
|
|
if( ( f = fopen( argv[1], "rb" ) ) == NULL )
|
|
{
|
|
printf( "\n ! Could not open %s\n\n", argv[1] );
|
|
goto exit;
|
|
}
|
|
|
|
argv[1][i] = '\0', i = 0;
|
|
|
|
while( fscanf( f, "%02X", &c ) > 0 &&
|
|
i < (int) sizeof( buf ) )
|
|
buf[i++] = (unsigned char) c;
|
|
|
|
fclose( f );
|
|
|
|
if( i != rsa.len )
|
|
{
|
|
printf( "\n ! Invalid RSA signature format\n\n" );
|
|
goto exit;
|
|
}
|
|
|
|
/*
|
|
* Compute the SHA-1 hash of the input file and compare
|
|
* it with the hash decrypted from the RSA signature.
|
|
*/
|
|
printf( "\n . Verifying the RSA/SHA-1 signature" );
|
|
fflush( stdout );
|
|
|
|
if( ( ret = sha1_file( argv[1], hash ) ) != 0 )
|
|
{
|
|
printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
|
|
goto exit;
|
|
}
|
|
|
|
if( ( ret = rsa_pkcs1_verify( &rsa, NULL, NULL, RSA_PUBLIC,
|
|
POLARSSL_MD_SHA1, 20, hash, buf ) ) != 0 )
|
|
{
|
|
printf( " failed\n ! rsa_pkcs1_verify returned -0x%0x\n\n", -ret );
|
|
goto exit;
|
|
}
|
|
|
|
printf( "\n . OK (the decrypted SHA-1 hash matches)\n\n" );
|
|
|
|
ret = 0;
|
|
|
|
exit:
|
|
|
|
#if defined(_WIN32)
|
|
printf( " + Press Enter to exit this program.\n" );
|
|
fflush( stdout ); getchar();
|
|
#endif
|
|
|
|
return( ret );
|
|
}
|
|
#endif /* POLARSSL_BIGNUM_C && POLARSSL_RSA_C && POLARSSL_SHA1_C &&
|
|
POLARSSL_FS_IO */
|