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/*
* Example RSA key generation 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.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#include <stdio.h>
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/bignum.h"
#include "polarssl/x509.h"
#include "polarssl/rsa.h"
#define KEY_SIZE 1024
#define EXPONENT 65537
#if !defined(POLARSSL_BIGNUM_C) || !defined(POLARSSL_ENTROPY_C) || \
!defined(POLARSSL_RSA_C) || !defined(POLARSSL_GENPRIME) || \
!defined(POLARSSL_FS_IO) || !defined(POLARSSL_CTR_DRBG_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf("POLARSSL_BIGNUM_C and/or POLARSSL_ENTROPY_C and/or "
"POLARSSL_RSA_C and/or POLARSSL_GENPRIME and/or "
"POLARSSL_FS_IO and/or POLARSSL_CTR_DRBG_C not defined.\n");
return( 0 );
}
#else
int main( int argc, char *argv[] )
{
int ret;
rsa_context rsa;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
FILE *fpub = NULL;
FILE *fpriv = NULL;
const char *pers = "rsa_genkey";
((void) argc);
((void) argv);
printf( "\n . Seeding the random number generator..." );
fflush( stdout );
entropy_init( &entropy );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
printf( " failed\n ! ctr_drbg_init returned %d\n", ret );
goto exit;
}
printf( " ok\n . Generating the RSA key [ %d-bit ]...", KEY_SIZE );
fflush( stdout );
rsa_init( &rsa, RSA_PKCS_V15, 0 );
if( ( ret = rsa_gen_key( &rsa, ctr_drbg_random, &ctr_drbg, KEY_SIZE,
EXPONENT ) ) != 0 )
{
printf( " failed\n ! rsa_gen_key returned %d\n\n", ret );
goto exit;
}
printf( " ok\n . Exporting the public key in rsa_pub.txt...." );
fflush( stdout );
if( ( fpub = fopen( "rsa_pub.txt", "wb+" ) ) == NULL )
{
printf( " failed\n ! could not open rsa_pub.txt for writing\n\n" );
ret = 1;
goto exit;
}
if( ( ret = mpi_write_file( "N = ", &rsa.N, 16, fpub ) ) != 0 ||
( ret = mpi_write_file( "E = ", &rsa.E, 16, fpub ) ) != 0 )
{
printf( " failed\n ! mpi_write_file returned %d\n\n", ret );
goto exit;
}
printf( " ok\n . Exporting the private key in rsa_priv.txt..." );
fflush( stdout );
if( ( fpriv = fopen( "rsa_priv.txt", "wb+" ) ) == NULL )
{
printf( " failed\n ! could not open rsa_priv.txt for writing\n" );
ret = 1;
goto exit;
}
if( ( ret = mpi_write_file( "N = " , &rsa.N , 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "E = " , &rsa.E , 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "D = " , &rsa.D , 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "P = " , &rsa.P , 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "Q = " , &rsa.Q , 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "DP = ", &rsa.DP, 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "DQ = ", &rsa.DQ, 16, fpriv ) ) != 0 ||
( ret = mpi_write_file( "QP = ", &rsa.QP, 16, fpriv ) ) != 0 )
{
printf( " failed\n ! mpi_write_file returned %d\n\n", ret );
goto exit;
}
/*
printf( " ok\n . Generating the certificate..." );
x509write_init_raw( &cert );
x509write_add_pubkey( &cert, &rsa );
x509write_add_subject( &cert, "CN='localhost'" );
x509write_add_validity( &cert, "2007-09-06 17:00:32",
"2010-09-06 17:00:32" );
x509write_create_selfsign( &cert, &rsa );
x509write_crtfile( &cert, "cert.der", X509_OUTPUT_DER );
x509write_crtfile( &cert, "cert.pem", X509_OUTPUT_PEM );
x509write_free_raw( &cert );
*/
printf( " ok\n\n" );
exit:
if( fpub != NULL )
fclose( fpub );
if( fpriv != NULL )
fclose( fpriv );
rsa_free( &rsa );
ctr_drbg_free( &ctr_drbg );
entropy_free( &entropy );
#if defined(_WIN32)
printf( " Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_BIGNUM_C && POLARSSL_ENTROPY_C && POLARSSL_RSA_C &&
POLARSSL_GENPRIME && POLARSSL_FS_IO && POLARSSL_CTR_DRBG_C */
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