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/*
* Example RSA key generation program
*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#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>
#include <stdlib.h>
#define mbedtls_printf printf
#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
#endif /* MBEDTLS_PLATFORM_C */
#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_ENTROPY_C) && \
defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME) && \
defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C)
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/bignum.h"
#include "mbedtls/x509.h"
#include "mbedtls/rsa.h"
#include <stdio.h>
#include <string.h>
#endif
#define KEY_SIZE 2048
#define EXPONENT 65537
#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_GENPRIME) || \
!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C)
int main( void )
{
mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
"MBEDTLS_RSA_C and/or MBEDTLS_GENPRIME and/or "
"MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C not defined.\n");
return( 0 );
}
#else
int main( void )
{
int ret = 1;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_rsa_context rsa;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
FILE *fpub = NULL;
FILE *fpriv = NULL;
const char *pers = "rsa_genkey";
mbedtls_ctr_drbg_init( &ctr_drbg );
mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
mbedtls_printf( "\n . Seeding the random number generator..." );
fflush( stdout );
mbedtls_entropy_init( &entropy );
if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
goto exit;
}
mbedtls_printf( " ok\n . Generating the RSA key [ %d-bit ]...", KEY_SIZE );
fflush( stdout );
if( ( ret = mbedtls_rsa_gen_key( &rsa, mbedtls_ctr_drbg_random, &ctr_drbg, KEY_SIZE,
EXPONENT ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n . Exporting the public key in rsa_pub.txt...." );
fflush( stdout );
if( ( ret = mbedtls_rsa_export ( &rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
( ret = mbedtls_rsa_export_crt( &rsa, &DP, &DQ, &QP ) ) != 0 )
{
mbedtls_printf( " failed\n ! could not export RSA parameters\n\n" );
goto exit;
}
if( ( fpub = fopen( "rsa_pub.txt", "wb+" ) ) == NULL )
{
mbedtls_printf( " failed\n ! could not open rsa_pub.txt for writing\n\n" );
goto exit;
}
if( ( ret = mbedtls_mpi_write_file( "N = ", &N, 16, fpub ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "E = ", &E, 16, fpub ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
goto exit;
}
mbedtls_printf( " ok\n . Exporting the private key in rsa_priv.txt..." );
fflush( stdout );
if( ( fpriv = fopen( "rsa_priv.txt", "wb+" ) ) == NULL )
{
mbedtls_printf( " failed\n ! could not open rsa_priv.txt for writing\n" );
goto exit;
}
if( ( ret = mbedtls_mpi_write_file( "N = " , &N , 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "E = " , &E , 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "D = " , &D , 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "P = " , &P , 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "Q = " , &Q , 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "DP = ", &DP, 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "DQ = ", &DQ, 16, fpriv ) ) != 0 ||
( ret = mbedtls_mpi_write_file( "QP = ", &QP, 16, fpriv ) ) != 0 )
{
mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
goto exit;
}
/*
mbedtls_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 );
*/
mbedtls_printf( " ok\n\n" );
exit_code = MBEDTLS_EXIT_SUCCESS;
exit:
if( fpub != NULL )
fclose( fpub );
if( fpriv != NULL )
fclose( fpriv );
mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
mbedtls_rsa_free( &rsa );
mbedtls_ctr_drbg_free( &ctr_drbg );
mbedtls_entropy_free( &entropy );
#if defined(_WIN32)
mbedtls_printf( " Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( exit_code );
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
MBEDTLS_GENPRIME && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */