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/*
* RSA/SHA-256 signature creation program
*
* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.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.
*/
#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>
#define mbedtls_fprintf fprintf
#define mbedtls_printf printf
#endif
#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \
defined(MBEDTLS_SHA256_C) && defined(MBEDTLS_FS_IO)
#include "mbedtls/rsa.h"
#include "mbedtls/sha1.h"
#include <stdio.h>
#include <string.h>
#endif
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \
!defined(MBEDTLS_SHA256_C) || !defined(MBEDTLS_FS_IO)
int main( void )
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
"MBEDTLS_SHA256_C and/or MBEDTLS_FS_IO not defined.\n");
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
FILE *f;
int ret;
size_t i;
mbedtls_rsa_context rsa;
unsigned char hash[20];
unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
ret = 1;
if( argc != 2 )
{
mbedtls_printf( "usage: rsa_sign <filename>\n" );
#if defined(_WIN32)
mbedtls_printf( "\n" );
#endif
goto exit;
}
mbedtls_printf( "\n . Reading private key from rsa_priv.txt" );
fflush( stdout );
if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL )
{
ret = 1;
mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \
" ! Please run rsa_genkey first\n\n" );
goto exit;
}
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
if( ( ret = mbedtls_mpi_read_file( &rsa.N , 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.E , 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.D , 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.P , 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.Q , 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.DP, 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.DQ, 16, f ) ) != 0 ||
( ret = mbedtls_mpi_read_file( &rsa.QP, 16, f ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret );
goto exit;
}
rsa.len = ( mbedtls_mpi_msb( &rsa.N ) + 7 ) >> 3;
fclose( f );
mbedtls_printf( "\n . Checking the private key" );
fflush( stdout );
if( ( ret = mbedtls_rsa_check_privkey( &rsa ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n", -ret );
goto exit;
}
/*
* Compute the SHA-256 hash of the input file,
* then calculate the RSA signature of the hash.
*/
mbedtls_printf( "\n . Generating the RSA/SHA-256 signature" );
fflush( stdout );
if( ( ret = mbedtls_sha1_file( argv[1], hash ) ) != 0 )
{
mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] );
goto exit;
}
if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256,
20, hash, buf ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\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;
mbedtls_printf( " failed\n ! Could not create %s\n\n", argv[1] );
goto exit;
}
for( i = 0; i < rsa.len; i++ )
mbedtls_fprintf( f, "%02X%s", buf[i],
( i + 1 ) % 16 == 0 ? "\r\n" : " " );
fclose( f );
mbedtls_printf( "\n . Done (created \"%s\")\n\n", argv[1] );
exit:
#if defined(_WIN32)
mbedtls_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_SHA256_C &&
MBEDTLS_FS_IO */