422 lines
12 KiB
C
422 lines
12 KiB
C
/*
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* Key generation application
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*
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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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#define mbedtls_printf printf
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#endif
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#if defined(MBEDTLS_PK_WRITE_C) && defined(MBEDTLS_FS_IO) && \
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defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_CTR_DRBG_C)
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#include "mbedtls/error.h"
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#include "mbedtls/pk.h"
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#include "mbedtls/ecdsa.h"
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#include "mbedtls/rsa.h"
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#include "mbedtls/error.h"
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#include "mbedtls/entropy.h"
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#include "mbedtls/ctr_drbg.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if !defined(_WIN32)
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#include <unistd.h>
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#define DEV_RANDOM_THRESHOLD 32
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int dev_random_entropy_poll( void *data, unsigned char *output,
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size_t len, size_t *olen )
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{
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FILE *file;
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size_t ret, left = len;
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unsigned char *p = output;
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((void) data);
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*olen = 0;
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file = fopen( "/dev/random", "rb" );
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if( file == NULL )
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return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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while( left > 0 )
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{
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/* /dev/random can return much less than requested. If so, try again */
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ret = fread( p, 1, left, file );
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if( ret == 0 && ferror( file ) )
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{
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fclose( file );
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return( MBEDTLS_ERR_ENTROPY_SOURCE_FAILED );
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}
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p += ret;
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left -= ret;
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sleep( 1 );
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}
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fclose( file );
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*olen = len;
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return( 0 );
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}
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#endif /* !_WIN32 */
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#endif
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#if defined(MBEDTLS_ECP_C)
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#define DFL_EC_CURVE mbedtls_ecp_curve_list()->grp_id
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#else
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#define DFL_EC_CURVE 0
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#endif
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#if !defined(_WIN32) && defined(MBEDTLS_FS_IO)
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#define USAGE_DEV_RANDOM \
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" use_dev_random=0|1 default: 0\n"
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#else
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#define USAGE_DEV_RANDOM ""
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#endif /* !_WIN32 && MBEDTLS_FS_IO */
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#define FORMAT_PEM 0
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#define FORMAT_DER 1
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#define DFL_TYPE MBEDTLS_PK_RSA
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#define DFL_RSA_KEYSIZE 4096
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#define DFL_FILENAME "keyfile.key"
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#define DFL_FORMAT FORMAT_PEM
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#define DFL_USE_DEV_RANDOM 0
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#define USAGE \
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"\n usage: gen_key param=<>...\n" \
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"\n acceptable parameters:\n" \
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" type=rsa|ec default: rsa\n" \
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" rsa_keysize=%%d default: 4096\n" \
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" ec_curve=%%s see below\n" \
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" filename=%%s default: keyfile.key\n" \
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" format=pem|der default: pem\n" \
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USAGE_DEV_RANDOM \
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"\n"
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#if !defined(MBEDTLS_PK_WRITE_C) || !defined(MBEDTLS_FS_IO) || \
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!defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C)
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int main( void )
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{
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mbedtls_printf( "MBEDTLS_PK_WRITE_C and/or MBEDTLS_FS_IO and/or "
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"MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C "
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"not defined.\n" );
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return( 0 );
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}
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#else
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/*
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* global options
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*/
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struct options
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{
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int type; /* the type of key to generate */
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int rsa_keysize; /* length of key in bits */
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int ec_curve; /* curve identifier for EC keys */
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const char *filename; /* filename of the key file */
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int format; /* the output format to use */
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int use_dev_random; /* use /dev/random as entropy source */
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} opt;
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static int write_private_key( mbedtls_pk_context *key, const char *output_file )
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{
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int ret;
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FILE *f;
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unsigned char output_buf[16000];
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unsigned char *c = output_buf;
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size_t len = 0;
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memset(output_buf, 0, 16000);
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if( opt.format == FORMAT_PEM )
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{
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if( ( ret = mbedtls_pk_write_key_pem( key, output_buf, 16000 ) ) != 0 )
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return( ret );
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len = strlen( (char *) output_buf );
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}
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else
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{
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if( ( ret = mbedtls_pk_write_key_der( key, output_buf, 16000 ) ) < 0 )
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return( ret );
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len = ret;
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c = output_buf + sizeof(output_buf) - len;
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}
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if( ( f = fopen( output_file, "wb" ) ) == NULL )
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return( -1 );
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if( fwrite( c, 1, len, f ) != len )
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{
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fclose( f );
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return( -1 );
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}
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fclose( f );
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return( 0 );
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}
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int main( int argc, char *argv[] )
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{
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int ret = 0;
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mbedtls_pk_context key;
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char buf[1024];
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int i;
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char *p, *q;
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mbedtls_entropy_context entropy;
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mbedtls_ctr_drbg_context ctr_drbg;
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const char *pers = "gen_key";
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#if defined(MBEDTLS_ECP_C)
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const mbedtls_ecp_curve_info *curve_info;
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#endif
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/*
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* Set to sane values
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*/
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mbedtls_pk_init( &key );
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mbedtls_ctr_drbg_init( &ctr_drbg );
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memset( buf, 0, sizeof( buf ) );
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if( argc == 0 )
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{
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usage:
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ret = 1;
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mbedtls_printf( USAGE );
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#if defined(MBEDTLS_ECP_C)
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mbedtls_printf( " available ec_curve values:\n" );
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curve_info = mbedtls_ecp_curve_list();
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mbedtls_printf( " %s (default)\n", curve_info->name );
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while( ( ++curve_info )->name != NULL )
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mbedtls_printf( " %s\n", curve_info->name );
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#endif
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goto exit;
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}
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opt.type = DFL_TYPE;
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opt.rsa_keysize = DFL_RSA_KEYSIZE;
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opt.ec_curve = DFL_EC_CURVE;
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opt.filename = DFL_FILENAME;
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opt.format = DFL_FORMAT;
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opt.use_dev_random = DFL_USE_DEV_RANDOM;
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for( i = 1; i < argc; i++ )
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{
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p = argv[i];
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if( ( q = strchr( p, '=' ) ) == NULL )
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goto usage;
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*q++ = '\0';
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if( strcmp( p, "type" ) == 0 )
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{
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if( strcmp( q, "rsa" ) == 0 )
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opt.type = MBEDTLS_PK_RSA;
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else if( strcmp( q, "ec" ) == 0 )
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opt.type = MBEDTLS_PK_ECKEY;
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else
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goto usage;
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}
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else if( strcmp( p, "format" ) == 0 )
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{
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if( strcmp( q, "pem" ) == 0 )
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opt.format = FORMAT_PEM;
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else if( strcmp( q, "der" ) == 0 )
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opt.format = FORMAT_DER;
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else
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goto usage;
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}
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else if( strcmp( p, "rsa_keysize" ) == 0 )
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{
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opt.rsa_keysize = atoi( q );
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if( opt.rsa_keysize < 1024 ||
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opt.rsa_keysize > MBEDTLS_MPI_MAX_BITS )
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goto usage;
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}
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#if defined(MBEDTLS_ECP_C)
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else if( strcmp( p, "ec_curve" ) == 0 )
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{
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if( ( curve_info = mbedtls_ecp_curve_info_from_name( q ) ) == NULL )
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goto usage;
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opt.ec_curve = curve_info->grp_id;
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}
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#endif
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else if( strcmp( p, "filename" ) == 0 )
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opt.filename = q;
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else if( strcmp( p, "use_dev_random" ) == 0 )
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{
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opt.use_dev_random = atoi( q );
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if( opt.use_dev_random < 0 || opt.use_dev_random > 1 )
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goto usage;
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}
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else
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goto usage;
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}
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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 !defined(_WIN32) && defined(MBEDTLS_FS_IO)
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if( opt.use_dev_random )
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{
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if( ( ret = mbedtls_entropy_add_source( &entropy, dev_random_entropy_poll,
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NULL, DEV_RANDOM_THRESHOLD,
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MBEDTLS_ENTROPY_SOURCE_STRONG ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_entropy_add_source returned -0x%04x\n", -ret );
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goto exit;
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}
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mbedtls_printf("\n Using /dev/random, so can take a long time! " );
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fflush( stdout );
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}
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#endif /* !_WIN32 && MBEDTLS_FS_IO */
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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 -0x%04x\n", -ret );
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goto exit;
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}
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/*
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* 1.1. Generate the key
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*/
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mbedtls_printf( "\n . Generating the private key ..." );
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fflush( stdout );
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if( ( ret = mbedtls_pk_setup( &key, mbedtls_pk_info_from_type( opt.type ) ) ) != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_pk_setup returned -0x%04x", -ret );
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goto exit;
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}
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#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
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if( opt.type == MBEDTLS_PK_RSA )
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{
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ret = mbedtls_rsa_gen_key( mbedtls_pk_rsa( key ), mbedtls_ctr_drbg_random, &ctr_drbg,
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opt.rsa_keysize, 65537 );
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if( ret != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned -0x%04x", -ret );
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goto exit;
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}
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}
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else
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#endif /* MBEDTLS_RSA_C */
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#if defined(MBEDTLS_ECP_C)
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if( opt.type == MBEDTLS_PK_ECKEY )
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{
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ret = mbedtls_ecp_gen_key( opt.ec_curve, mbedtls_pk_ec( key ),
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mbedtls_ctr_drbg_random, &ctr_drbg );
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if( ret != 0 )
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{
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mbedtls_printf( " failed\n ! mbedtls_rsa_gen_key returned -0x%04x", -ret );
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goto exit;
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}
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}
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else
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#endif /* MBEDTLS_ECP_C */
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{
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mbedtls_printf( " failed\n ! key type not supported\n" );
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goto exit;
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}
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/*
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* 1.2 Print the key
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*/
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mbedtls_printf( " ok\n . Key information:\n" );
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#if defined(MBEDTLS_RSA_C)
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if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_RSA )
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{
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mbedtls_rsa_context *rsa = mbedtls_pk_rsa( key );
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mbedtls_mpi_write_file( "N: ", &rsa->N, 16, NULL );
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mbedtls_mpi_write_file( "E: ", &rsa->E, 16, NULL );
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mbedtls_mpi_write_file( "D: ", &rsa->D, 16, NULL );
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mbedtls_mpi_write_file( "P: ", &rsa->P, 16, NULL );
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mbedtls_mpi_write_file( "Q: ", &rsa->Q, 16, NULL );
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mbedtls_mpi_write_file( "DP: ", &rsa->DP, 16, NULL );
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mbedtls_mpi_write_file( "DQ: ", &rsa->DQ, 16, NULL );
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mbedtls_mpi_write_file( "QP: ", &rsa->QP, 16, NULL );
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}
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else
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#endif
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#if defined(MBEDTLS_ECP_C)
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if( mbedtls_pk_get_type( &key ) == MBEDTLS_PK_ECKEY )
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{
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mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( key );
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mbedtls_printf( "curve: %s\n",
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mbedtls_ecp_curve_info_from_grp_id( ecp->grp.id )->name );
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mbedtls_mpi_write_file( "X_Q: ", &ecp->Q.X, 16, NULL );
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mbedtls_mpi_write_file( "Y_Q: ", &ecp->Q.Y, 16, NULL );
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mbedtls_mpi_write_file( "D: ", &ecp->d , 16, NULL );
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}
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else
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#endif
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mbedtls_printf(" ! key type not supported\n");
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/*
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* 1.3 Export key
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*/
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mbedtls_printf( " . Writing key to file..." );
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if( ( ret = write_private_key( &key, opt.filename ) ) != 0 )
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{
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mbedtls_printf( " failed\n" );
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goto exit;
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}
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mbedtls_printf( " ok\n" );
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exit:
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if( ret != 0 && ret != 1)
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{
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#ifdef MBEDTLS_ERROR_C
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mbedtls_strerror( ret, buf, sizeof( buf ) );
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mbedtls_printf( " - %s\n", buf );
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#else
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mbedtls_printf("\n");
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#endif
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}
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mbedtls_pk_free( &key );
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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( ret );
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}
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#endif /* MBEDTLS_PK_WRITE_C && MBEDTLS_FS_IO */
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