192 lines
6.5 KiB
C
192 lines
6.5 KiB
C
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/*
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* Example RSA key generation program
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: GPL-2.0
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#define mbedtls_printf printf
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif /* MBEDTLS_PLATFORM_C */
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#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_ENTROPY_C) && \
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defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME) && \
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defined(MBEDTLS_FS_IO) && defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include "mbedtls/bignum.h"
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#include "mbedtls/x509.h"
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#include "mbedtls/rsa.h"
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#include <stdio.h>
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#include <string.h>
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#endif
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#define KEY_SIZE 2048
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#define EXPONENT 65537
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#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
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!defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_GENPRIME) || \
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!defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_CTR_DRBG_C)
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int main( void )
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{
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mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
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"MBEDTLS_RSA_C and/or MBEDTLS_GENPRIME and/or "
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"MBEDTLS_FS_IO and/or MBEDTLS_CTR_DRBG_C not defined.\n");
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return( 0 );
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}
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#else
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int main( void )
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{
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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mbedtls_rsa_context rsa;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
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FILE *fpub = NULL;
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FILE *fpriv = NULL;
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const char *pers = "rsa_genkey";
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mbedtls_ctr_drbg_init( &ctr_drbg );
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mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 );
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mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
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mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP );
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mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
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mbedtls_printf( "\n . Seeding the random number generator..." );
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fflush( stdout );
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mbedtls_entropy_init( &entropy );
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if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n . Generating the RSA key [ %d-bit ]...", KEY_SIZE );
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fflush( stdout );
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if( ( ret = mbedtls_rsa_gen_key( &rsa, mbedtls_ctr_drbg_random, &ctr_drbg, KEY_SIZE,
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EXPONENT ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n . Exporting the public key in rsa_pub.txt...." );
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fflush( stdout );
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if( ( ret = mbedtls_rsa_export ( &rsa, &N, &P, &Q, &D, &E ) ) != 0 ||
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( ret = mbedtls_rsa_export_crt( &rsa, &DP, &DQ, &QP ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! could not export RSA parameters\n\n" );
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goto exit;
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}
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if( ( fpub = fopen( "rsa_pub.txt", "wb+" ) ) == NULL )
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{
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mbedtls_printf( " failed\n ! could not open rsa_pub.txt for writing\n\n" );
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goto exit;
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}
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if( ( ret = mbedtls_mpi_write_file( "N = ", &N, 16, fpub ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "E = ", &E, 16, fpub ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
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goto exit;
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}
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mbedtls_printf( " ok\n . Exporting the private key in rsa_priv.txt..." );
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fflush( stdout );
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if( ( fpriv = fopen( "rsa_priv.txt", "wb+" ) ) == NULL )
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{
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mbedtls_printf( " failed\n ! could not open rsa_priv.txt for writing\n" );
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goto exit;
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}
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if( ( ret = mbedtls_mpi_write_file( "N = " , &N , 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "E = " , &E , 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "D = " , &D , 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "P = " , &P , 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "Q = " , &Q , 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "DP = ", &DP, 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "DQ = ", &DQ, 16, fpriv ) ) != 0 ||
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( ret = mbedtls_mpi_write_file( "QP = ", &QP, 16, fpriv ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
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goto exit;
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}
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/*
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mbedtls_printf( " ok\n . Generating the certificate..." );
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x509write_init_raw( &cert );
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x509write_add_pubkey( &cert, &rsa );
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x509write_add_subject( &cert, "CN='localhost'" );
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x509write_add_validity( &cert, "2007-09-06 17:00:32",
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"2010-09-06 17:00:32" );
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x509write_create_selfsign( &cert, &rsa );
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x509write_crtfile( &cert, "cert.der", X509_OUTPUT_DER );
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x509write_crtfile( &cert, "cert.pem", X509_OUTPUT_PEM );
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x509write_free_raw( &cert );
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*/
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mbedtls_printf( " ok\n\n" );
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exit_code = MBEDTLS_EXIT_SUCCESS;
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exit:
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if( fpub != NULL )
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fclose( fpub );
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if( fpriv != NULL )
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fclose( fpriv );
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mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
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mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP );
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mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP );
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mbedtls_rsa_free( &rsa );
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mbedtls_ctr_drbg_free( &ctr_drbg );
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mbedtls_entropy_free( &entropy );
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#if defined(_WIN32)
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mbedtls_printf( " Press Enter to exit this program.\n" );
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fflush( stdout ); getchar();
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#endif
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return( exit_code );
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}
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#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C &&
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MBEDTLS_GENPRIME && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
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