2009-01-03 22:22:43 +01:00
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/*
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* Example RSA key generation program
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*
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2020-08-07 13:07:28 +02:00
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* Copyright The Mbed TLS Contributors
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2015-09-04 14:21:07 +02:00
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* SPDX-License-Identifier: Apache-2.0
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2010-07-18 22:36:00 +02:00
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*
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2015-09-04 14:21:07 +02:00
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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2010-07-18 22:36:00 +02:00
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*
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2015-09-04 14:21:07 +02:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2009-01-03 22:22:43 +01:00
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*
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2015-09-04 14:21:07 +02:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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2009-01-03 22:22:43 +01:00
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*/
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2015-04-08 12:49:31 +02:00
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#if !defined(MBEDTLS_CONFIG_FILE)
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2015-03-09 18:05:11 +01:00
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#include "mbedtls/config.h"
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2014-04-29 12:39:06 +02:00
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#else
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2015-04-08 12:49:31 +02:00
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#include MBEDTLS_CONFIG_FILE
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2014-04-29 12:39:06 +02:00
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#endif
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2009-01-03 22:22:43 +01:00
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2015-04-08 12:49:31 +02:00
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#if defined(MBEDTLS_PLATFORM_C)
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2015-03-09 18:05:11 +01:00
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#include "mbedtls/platform.h"
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2015-01-19 15:26:37 +01:00
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#else
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2015-02-11 15:06:19 +01:00
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#include <stdio.h>
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2018-04-29 21:12:43 +02:00
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#include <stdlib.h>
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#define mbedtls_printf printf
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2018-12-10 14:31:45 +01:00
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#define mbedtls_exit exit
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2018-04-30 23:42:33 +02:00
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#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
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2018-04-29 21:12:43 +02:00
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#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
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#endif /* MBEDTLS_PLATFORM_C */
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2015-01-19 15:26:37 +01:00
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2015-04-08 12:49:31 +02:00
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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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2015-03-09 18:05:11 +01:00
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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/rsa.h"
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2015-02-13 15:12:07 +01:00
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2015-02-11 15:06:19 +01:00
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#include <stdio.h>
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#include <string.h>
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#endif
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2009-01-03 22:22:43 +01:00
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2015-08-27 21:42:49 +02:00
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#define KEY_SIZE 2048
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2009-01-03 22:22:43 +01:00
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#define EXPONENT 65537
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2015-04-08 12:49:31 +02:00
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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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2015-02-12 12:37:29 +01:00
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int main( void )
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2011-05-26 15:16:06 +02:00
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{
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2015-04-08 12:49:31 +02:00
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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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2019-04-24 14:24:46 +02:00
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mbedtls_exit( 0 );
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2011-05-26 15:16:06 +02:00
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}
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#else
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2018-12-06 18:43:31 +01:00
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2015-02-12 12:37:29 +01:00
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int main( void )
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2009-01-03 22:22:43 +01:00
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{
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2018-04-29 21:12:43 +02:00
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int ret = 1;
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int exit_code = MBEDTLS_EXIT_FAILURE;
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2015-04-08 12:49:31 +02:00
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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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2017-08-23 08:42:28 +02:00
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mbedtls_mpi N, P, Q, D, E, DP, DQ, QP;
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2009-01-03 22:22:43 +01:00
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FILE *fpub = NULL;
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FILE *fpriv = NULL;
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2013-06-24 13:01:08 +02:00
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const char *pers = "rsa_genkey";
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2009-01-03 22:22:43 +01:00
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2015-04-28 22:52:30 +02:00
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mbedtls_ctr_drbg_init( &ctr_drbg );
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2018-01-10 08:12:01 +01:00
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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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2015-04-28 22:52:30 +02:00
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( "\n . Seeding the random number generator..." );
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2009-01-03 22:22:43 +01:00
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fflush( stdout );
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2015-04-08 12:49:31 +02:00
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mbedtls_entropy_init( &entropy );
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2015-04-28 22:52:30 +02:00
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if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
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2013-06-24 13:01:08 +02:00
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(const unsigned char *) pers,
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strlen( pers ) ) ) != 0 )
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2011-12-04 18:09:26 +01:00
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{
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2015-04-28 22:52:30 +02:00
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mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
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2011-12-04 18:09:26 +01:00
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goto exit;
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}
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2009-01-03 22:22:43 +01:00
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " ok\n . Generating the RSA key [ %d-bit ]...", KEY_SIZE );
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2009-01-03 22:22:43 +01:00
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fflush( stdout );
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2015-04-08 12:49:31 +02:00
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if( ( ret = mbedtls_rsa_gen_key( &rsa, mbedtls_ctr_drbg_random, &ctr_drbg, KEY_SIZE,
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2017-08-23 08:42:28 +02:00
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EXPONENT ) ) != 0 )
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2009-01-03 22:22:43 +01:00
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{
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned %d\n\n", ret );
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2009-01-03 22:22:43 +01:00
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goto exit;
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}
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " ok\n . Exporting the public key in rsa_pub.txt...." );
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2009-01-03 22:22:43 +01:00
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fflush( stdout );
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2017-08-23 08:42:28 +02:00
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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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2009-01-03 22:22:43 +01:00
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if( ( fpub = fopen( "rsa_pub.txt", "wb+" ) ) == NULL )
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{
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " failed\n ! could not open rsa_pub.txt for writing\n\n" );
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2009-01-03 22:22:43 +01:00
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goto exit;
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}
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2017-08-23 08:42:28 +02:00
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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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2009-01-03 22:22:43 +01:00
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{
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
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2009-01-03 22:22:43 +01:00
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goto exit;
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}
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " ok\n . Exporting the private key in rsa_priv.txt..." );
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2009-01-03 22:22:43 +01:00
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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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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " failed\n ! could not open rsa_priv.txt for writing\n" );
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2009-01-03 22:22:43 +01:00
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goto exit;
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}
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2017-08-23 08:42:28 +02:00
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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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2009-01-03 22:22:43 +01:00
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{
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " failed\n ! mbedtls_mpi_write_file returned %d\n\n", ret );
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2009-01-03 22:22:43 +01:00
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goto exit;
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}
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " ok\n\n" );
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2009-01-03 22:22:43 +01:00
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2018-04-29 21:12:43 +02:00
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exit_code = MBEDTLS_EXIT_SUCCESS;
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2009-01-03 22:22:43 +01:00
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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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2017-08-23 08:42:28 +02:00
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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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2015-04-08 12:49:31 +02:00
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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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2009-01-03 22:22:43 +01:00
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2011-11-18 15:26:47 +01:00
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#if defined(_WIN32)
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2015-04-08 12:49:31 +02:00
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mbedtls_printf( " Press Enter to exit this program.\n" );
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2009-01-03 22:22:43 +01:00
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fflush( stdout ); getchar();
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#endif
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2019-04-24 14:24:46 +02:00
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mbedtls_exit( exit_code );
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2009-01-03 22:22:43 +01:00
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}
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2015-04-08 12:49:31 +02:00
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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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