mbedtls/programs/pkey/rsa_sign.c

133 lines
3.5 KiB
C

/*
* RSA/SHA-1 signature creation program
*
* Based on XySSL: Copyright (C) 2006-2008 Christophe Devine
*
* Copyright (C) 2009 Paul Bakker <polarssl_maintainer at polarssl dot 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.
*/
#ifndef _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE 1
#endif
#include <string.h>
#include <stdio.h>
#include "polarssl/rsa.h"
#include "polarssl/sha1.h"
int main( int argc, char *argv[] )
{
FILE *f;
int ret, i;
rsa_context rsa;
unsigned char hash[20];
unsigned char buf[512];
ret = 1;
if( argc != 2 )
{
printf( "usage: rsa_sign <filename>\n" );
#ifdef WIN32
printf( "\n" );
#endif
goto exit;
}
printf( "\n . Reading private key from rsa_priv.txt" );
fflush( stdout );
if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
{
ret = 1;
printf( " failed\n ! Could not open rsa_priv.txt\n" \
" ! Please run rsa_genkey first\n\n" );
goto exit;
}
rsa_init( &rsa, RSA_PKCS_V15, 0, NULL, NULL );
if( ( ret = mpi_read_file( &rsa.N , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.E , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.D , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.P , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.Q , 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.DP, 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.DQ, 16, f ) ) != 0 ||
( ret = mpi_read_file( &rsa.QP, 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 );
/*
* Compute the SHA-1 hash of the input file,
* then calculate the RSA signature of the hash.
*/
printf( "\n . Generating 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_sign( &rsa, RSA_PRIVATE, RSA_SHA1,
20, hash, buf ) ) != 0 )
{
printf( " failed\n ! rsa_pkcs1_sign returned %d\n\n", ret );
goto exit;
}
/*
* Write the signature into <filename>-sig.txt
*/
memcpy( argv[1] + strlen( argv[1] ), ".sig", 5 );
if( ( f = fopen( argv[1], "wb+" ) ) == NULL )
{
ret = 1;
printf( " failed\n ! Could not create %s\n\n", argv[1] );
goto exit;
}
for( i = 0; i < rsa.len; i++ )
fprintf( f, "%02X%s", buf[i],
( i + 1 ) % 16 == 0 ? "\r\n" : " " );
fclose( f );
printf( "\n . Done (created \"%s\")\n\n", argv[1] );
exit:
#ifdef WIN32
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}