| /* |
| * Example RSA key generation program |
| * |
| * Copyright The Mbed TLS Contributors |
| * 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. |
| */ |
| |
| #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 exit |
| #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/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"); |
| mbedtls_exit( 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\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 |
| |
| mbedtls_exit( exit_code ); |
| } |
| #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_RSA_C && |
| MBEDTLS_GENPRIME && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */ |