| /* |
| * Key generation application |
| * |
| * 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> |
| #define mbedtls_printf printf |
| #endif |
| |
| #if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO) && \ |
| defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C) |
| #include "mbedtls/error.h" |
| #include "mbedtls/pk.h" |
| #include "mbedtls/ecdsa.h" |
| #include "mbedtls/rsa.h" |
| #include "mbedtls/error.h" |
| #include "mbedtls/entropy.h" |
| #include "mbedtls/ctr_drbg.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #if !defined(_WIN32) |
| #include <unistd.h> |
| |
| #define DEV_RANDOM_THRESHOLD 32 |
| |
| int dev_random_entropy_poll( void *data, unsigned char *output, |
| size_t len, size_t *olen ) |
| { |
| FILE *file; |
| size_t ret, left = len; |
| unsigned char *p = output; |
| ((void) data); |
| |
| *olen = 0; |
| |
| file = fopen( "/dev/random", "rb" ); |
| if( file == NULL ) |
| return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED ); |
| |
| while( left > 0 ) |
| { |
| /* /dev/random can return much less than requested. If so, try again */ |
| ret = fread( p, 1, left, file ); |
| if( ret == 0 && ferror( file ) ) |
| { |
| fclose( file ); |
| return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED ); |
| } |
| |
| p += ret; |
| left -= ret; |
| sleep( 1 ); |
| } |
| fclose( file ); |
| *olen = len; |
| |
| return( 0 ); |
| } |
| #endif /* !_WIN32 */ |
| #endif |
| |
| #if defined(MBEDTLS_ECP_C) |
| #define DFL_EC_CURVE mbedtls_ecp_curve_list()->grp_id |
| #else |
| #define DFL_EC_CURVE 0 |
| #endif |
| |
| #if !defined(_WIN32) && defined(MBEDTLS_FS_IO) |
| #define USAGE_DEV_RANDOM \ |
| " use_dev_random=0|1 default: 0\n" |
| #else |
| #define USAGE_DEV_RANDOM "" |
| #endif /* !_WIN32 && MBEDTLS_FS_IO */ |
| |
| #define FORMAT_PEM 0 |
| #define FORMAT_DER 1 |
| |
| #define DFL_TYPE MBEDTLS_PK_RSA |
| #define DFL_RSA_KEYSIZE 4096 |
| #define DFL_FILENAME "keyfile.key" |
| #define DFL_FORMAT FORMAT_PEM |
| #define DFL_USE_DEV_RANDOM 0 |
| |
| #define USAGE \ |
| "\n usage: gen_key param=<>...\n" \ |
| "\n acceptable parameters:\n" \ |
| " type=rsa|ec default: rsa\n" \ |
| " rsa_keysize=%%d default: 4096\n" \ |
| " ec_curve=%%s see below\n" \ |
| " filename=%%s default: keyfile.key\n" \ |
| " format=pem|der default: pem\n" \ |
| USAGE_DEV_RANDOM \ |
| "\n" |
| |
| #if !defined(MBEDTLS_PK_WRITE_C) || !defined(MBEDTLS_PEM_WRITE_C) || \ |
| !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \ |
| !defined(MBEDTLS_CTR_DRBG_C) |
| int main( void ) |
| { |
| mbedtls_printf( "MBEDTLS_PK_WRITE_C and/or MBEDTLS_FS_IO and/or " |
| "MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or " |
| "MBEDTLS_PEM_WRITE_C" |
| "not defined.\n" ); |
| return( 0 ); |
| } |
| #else |
| /* |
| * global options |
| */ |
| struct options |
| { |
| int type; /* the type of key to generate */ |
| int rsa_keysize; /* length of key in bits */ |
| int ec_curve; /* curve identifier for EC keys */ |
| const char *filename; /* filename of the key file */ |
| int format; /* the output format to use */ |
| int use_dev_random; /* use /dev/random as entropy source */ |
| } opt; |
| |
| static int write_private_key( mbedtls_pk_context *key, const char *output_file ) |
| { |
| int ret; |
| FILE *f; |
| unsigned char output_buf[16000]; |
| unsigned char *c = output_buf; |
| size_t len = 0; |
| |
| memset(output_buf, 0, 16000); |
| if( opt.format == FORMAT_PEM ) |
| { |
| if( ( ret = mbedtls_pk_write_key_pem( key, output_buf, 16000 ) ) != 0 ) |
| return( ret ); |
| |
| len = strlen( (char *) output_buf ); |
| } |
| else |
| { |
| if( ( ret = mbedtls_pk_write_key_der( key, output_buf, 16000 ) ) < 0 ) |
| return( ret ); |
| |
| len = ret; |
| c = output_buf + sizeof(output_buf) - len; |
| } |
| |
| if( ( f = fopen( output_file, "wb" ) ) == NULL ) |
| return( -1 ); |
| |
| if( fwrite( c, 1, len, f ) != len ) |
| { |
| fclose( f ); |
| return( -1 ); |
| } |
| |
| fclose( f ); |
| |
| return( 0 ); |
| } |
| |
| int main( int argc, char *argv[] ) |
| { |
| int ret = 0; |
| mbedtls_pk_context key; |
| char buf[1024]; |
| int i; |
| char *p, *q; |
| mbedtls_mpi N, P, Q, D, E, DP, DQ, QP; |
| mbedtls_entropy_context entropy; |
| mbedtls_ctr_drbg_context ctr_drbg; |
| const char *pers = "gen_key"; |
| #if defined(MBEDTLS_ECP_C) |
| const mbedtls_ecp_curve_info *curve_info; |
| #endif |
| |
| /* |
| * Set to sane values |
| */ |
| |
| 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_pk_init( &key ); |
| mbedtls_ctr_drbg_init( &ctr_drbg ); |
| memset( buf, 0, sizeof( buf ) ); |
| |
| if( argc == 0 ) |
| { |
| usage: |
| ret = 1; |
| mbedtls_printf( USAGE ); |
| #if defined(MBEDTLS_ECP_C) |
| mbedtls_printf( " available ec_curve values:\n" ); |
| curve_info = mbedtls_ecp_curve_list(); |
| mbedtls_printf( " %s (default)\n", curve_info->name ); |
| while( ( ++curve_info )->name != NULL ) |
| mbedtls_printf( " %s\n", curve_info->name ); |
| #endif |
| goto exit; |
| } |
| |
| opt.type = DFL_TYPE; |
| opt.rsa_keysize = DFL_RSA_KEYSIZE; |
| opt.ec_curve = DFL_EC_CURVE; |
| opt.filename = DFL_FILENAME; |
| opt.format = DFL_FORMAT; |
| opt.use_dev_random = DFL_USE_DEV_RANDOM; |
| |
| for( i = 1; i < argc; i++ ) |
| { |
| p = argv[i]; |
| if( ( q = strchr( p, '=' ) ) == NULL ) |
| goto usage; |
| *q++ = '\0'; |
| |
| if( strcmp( p, "type" ) == 0 ) |
| { |
| if( strcmp( q, "rsa" ) == 0 ) |
| opt.type = MBEDTLS_PK_RSA; |
| else if( strcmp( q, "ec" ) == 0 ) |
| opt.type = MBEDTLS_PK_ECKEY; |
| else |
| goto usage; |
| } |
| else if( strcmp( p, "format" ) == 0 ) |
| { |
| if( strcmp( q, "pem" ) == 0 ) |
| opt.format = FORMAT_PEM; |
| else if( strcmp( q, "der" ) == 0 ) |
| opt.format = FORMAT_DER; |
| else |
| goto usage; |
| } |
| else if( strcmp( p, "rsa_keysize" ) == 0 ) |
| { |
| opt.rsa_keysize = atoi( q ); |
| if( opt.rsa_keysize < 1024 || |
| opt.rsa_keysize > MBEDTLS_MPI_MAX_BITS ) |
| goto usage; |
| } |
| #if defined(MBEDTLS_ECP_C) |
| else if( strcmp( p, "ec_curve" ) == 0 ) |
| { |
| if( ( curve_info = mbedtls_ecp_curve_info_from_name( q ) ) == NULL ) |
| goto usage; |
| opt.ec_curve = curve_info->grp_id; |
| } |
| #endif |
| else if( strcmp( p, "filename" ) == 0 ) |
| opt.filename = q; |
| else if( strcmp( p, "use_dev_random" ) == 0 ) |
| { |
| opt.use_dev_random = atoi( q ); |
| if( opt.use_dev_random < 0 || opt.use_dev_random > 1 ) |
| goto usage; |
| } |
| else |
| goto usage; |
| } |
| |
| mbedtls_printf( "\n . Seeding the random number generator..." ); |
| fflush( stdout ); |
| |
| mbedtls_entropy_init( &entropy ); |
| #if !defined(_WIN32) && defined(MBEDTLS_FS_IO) |
| if( opt.use_dev_random ) |
| { |
| if( ( ret = mbedtls_entropy_add_source( &entropy, dev_random_entropy_poll, |
| NULL, DEV_RANDOM_THRESHOLD, |
| MBEDTLS_ENTROPY_SOURCE_STRONG ) ) != 0 ) |
| { |
| mbedtls_printf( " failed\n ! mbedtls_entropy_add_source returned -0x%04x\n", -ret ); |
| goto exit; |
| } |
| |
| mbedtls_printf("\n Using /dev/random, so can take a long time! " ); |
| fflush( stdout ); |
| } |
| #endif /* !_WIN32 && MBEDTLS_FS_IO */ |
| |
| 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 -0x%04x\n", -ret ); |
| goto exit; |
| } |
| |
| /* |
| * 1.1. Generate the key |
| */ |
| mbedtls_printf( "\n . Generating the private key ..." ); |
| fflush( stdout ); |
| |
| if( ( ret = mbedtls_pk_setup( &key, mbedtls_pk_info_from_type( opt.type ) ) ) != 0 ) |
| { |
| mbedtls_printf( " failed\n ! mbedtls_pk_setup returned -0x%04x", -ret ); |
| goto exit; |
| } |
| |
| #if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME) |
| if( opt.type == MBEDTLS_PK_RSA ) |
| { |
| ret = mbedtls_rsa_gen_key( mbedtls_pk_rsa( key ), mbedtls_ctr_drbg_random, &ctr_drbg, |
| opt.rsa_keysize, 65537 ); |
| if( ret != 0 ) |
| { |
| mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned -0x%04x", -ret ); |
| goto exit; |
| } |
| } |
| else |
| #endif /* MBEDTLS_RSA_C */ |
| #if defined(MBEDTLS_ECP_C) |
| if( opt.type == MBEDTLS_PK_ECKEY ) |
| { |
| ret = mbedtls_ecp_gen_key( opt.ec_curve, mbedtls_pk_ec( key ), |
| mbedtls_ctr_drbg_random, &ctr_drbg ); |
| if( ret != 0 ) |
| { |
| mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned -0x%04x", -ret ); |
| goto exit; |
| } |
| } |
| else |
| #endif /* MBEDTLS_ECP_C */ |
| { |
| mbedtls_printf( " failed\n ! key type not supported\n" ); |
| goto exit; |
| } |
| |
| /* |
| * 1.2 Print the key |
| */ |
| mbedtls_printf( " ok\n . Key information:\n" ); |
| |
| #if defined(MBEDTLS_RSA_C) |
| if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA ) |
| { |
| mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key ); |
| |
| 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; |
| } |
| |
| mbedtls_mpi_write_file( "N: ", &N, 16, NULL ); |
| mbedtls_mpi_write_file( "E: ", &E, 16, NULL ); |
| mbedtls_mpi_write_file( "D: ", &D, 16, NULL ); |
| mbedtls_mpi_write_file( "P: ", &P, 16, NULL ); |
| mbedtls_mpi_write_file( "Q: ", &Q, 16, NULL ); |
| mbedtls_mpi_write_file( "DP: ", &DP, 16, NULL ); |
| mbedtls_mpi_write_file( "DQ: ", &DQ, 16, NULL ); |
| mbedtls_mpi_write_file( "QP: ", &QP, 16, NULL ); |
| } |
| else |
| #endif |
| #if defined(MBEDTLS_ECP_C) |
| if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY ) |
| { |
| mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key ); |
| mbedtls_printf( "curve: %s\n", |
| mbedtls_ecp_curve_info_from_grp_id( ecp->grp.id )->name ); |
| mbedtls_mpi_write_file( "X_Q: ", &ecp->Q.X, 16, NULL ); |
| mbedtls_mpi_write_file( "Y_Q: ", &ecp->Q.Y, 16, NULL ); |
| mbedtls_mpi_write_file( "D: ", &ecp->d , 16, NULL ); |
| } |
| else |
| #endif |
| mbedtls_printf(" ! key type not supported\n"); |
| |
| /* |
| * 1.3 Export key |
| */ |
| mbedtls_printf( " . Writing key to file..." ); |
| |
| if( ( ret = write_private_key( &key, opt.filename ) ) != 0 ) |
| { |
| mbedtls_printf( " failed\n" ); |
| goto exit; |
| } |
| |
| mbedtls_printf( " ok\n" ); |
| |
| exit: |
| |
| if( ret != 0 && ret != 1) |
| { |
| #ifdef MBEDTLS_ERROR_C |
| mbedtls_strerror( ret, buf, sizeof( buf ) ); |
| mbedtls_printf( " - %s\n", buf ); |
| #else |
| mbedtls_printf("\n"); |
| #endif |
| } |
| |
| 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_pk_free( &key ); |
| 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( ret ); |
| } |
| #endif /* MBEDTLS_PK_WRITE_C && MBEDTLS_PEM_WRITE_C && MBEDTLS_FS_IO && |
| * MBEDTLS_ENTROPY_C && MBEDTLS_CTR_DRBG_C */ |