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mbedtls/programs/pkey/gen_key.c

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/*
* Key generation application
*
* Copyright (C) 2006-2013, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
#include <unistd.h>
#endif /* !_WIN32 && POLARSSL_FS_IO */
#include "polarssl/error.h"
#include "polarssl/pk.h"
#include "polarssl/ecdsa.h"
#include "polarssl/rsa.h"
#include "polarssl/error.h"
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#if !defined(POLARSSL_PK_WRITE_C) || !defined(POLARSSL_FS_IO) || \
!defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C)
int main( int argc, char *argv[] )
{
((void) argc);
((void) argv);
printf( "POLARSSL_PK_WRITE_C and/or POLARSSL_FS_IO and/or "
"POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C "
"not defined.\n" );
return( 0 );
}
#else
#define FORMAT_PEM 0
#define FORMAT_DER 1
#define DFL_TYPE POLARSSL_PK_RSA
#define DFL_RSA_KEYSIZE 4096
#define DFL_EC_CURVE ecp_curve_list()->grp_id
#define DFL_FILENAME "keyfile.key"
#define DFL_FORMAT FORMAT_PEM
#define DFL_USE_DEV_RANDOM 0
/*
* 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;
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
#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( POLARSSL_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( POLARSSL_ERR_ENTROPY_SOURCE_FAILED );
}
p += ret;
left -= ret;
sleep( 1 );
}
fclose( file );
*olen = len;
return( 0 );
}
#endif /* !_WIN32 && POLARSSL_FS_IO */
static int write_private_key( 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 = pk_write_key_pem( key, output_buf, 16000 ) ) != 0 )
return( ret );
len = strlen( (char *) output_buf );
}
else
{
if( ( ret = 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 );
}
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
#define USAGE_DEV_RANDOM \
" use_dev_random=0|1 default: 0\n"
#else
#define USAGE_DEV_RANDOM ""
#endif /* !_WIN32 && POLARSSL_FS_IO */
#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"
int main( int argc, char *argv[] )
{
int ret = 0;
pk_context key;
char buf[1024];
int i;
char *p, *q;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
const char *pers = "gen_key";
#if defined(POLARSSL_ECP_C)
const ecp_curve_info *curve_info;
#endif
/*
* Set to sane values
*/
pk_init( &key );
memset( buf, 0, sizeof( buf ) );
if( argc == 0 )
{
usage:
ret = 1;
printf( USAGE );
#if defined(POLARSSL_ECP_C)
printf( " availabled ec_curve values:\n" );
curve_info = ecp_curve_list();
printf( " %s (default)\n", curve_info->name );
while( ( ++curve_info )->name != NULL )
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 = POLARSSL_PK_RSA;
else if( strcmp( q, "ec" ) == 0 )
opt.type = POLARSSL_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 > 8192 )
goto usage;
}
else if( strcmp( p, "ec_curve" ) == 0 )
{
if( ( curve_info = ecp_curve_info_from_name( q ) ) == NULL )
goto usage;
opt.ec_curve = curve_info->grp_id;
}
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;
}
printf( "\n . Seeding the random number generator..." );
fflush( stdout );
entropy_init( &entropy );
#if !defined(_WIN32) && defined(POLARSSL_FS_IO)
if( opt.use_dev_random )
{
if( ( ret = entropy_add_source( &entropy, dev_random_entropy_poll,
NULL, DEV_RANDOM_THRESHOLD ) ) != 0 )
{
printf( " failed\n ! entropy_add_source returned -0x%04x\n", -ret );
goto exit;
}
printf("\n Using /dev/random, so can take a long time! " );
fflush( stdout );
}
#endif /* !_WIN32 && POLARSSL_FS_IO */
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
printf( " failed\n ! ctr_drbg_init returned -0x%04x\n", -ret );
goto exit;
}
/*
* 1.1. Generate the key
*/
printf( "\n . Generating the private key ..." );
fflush( stdout );
if( ( ret = pk_init_ctx( &key, pk_info_from_type( opt.type ) ) ) != 0 )
{
printf( " failed\n ! pk_init_ctx returned -0x%04x", -ret );
goto exit;
}
#if defined(POLARSSL_RSA_C) && defined(POLARSSL_GENPRIME)
if( opt.type == POLARSSL_PK_RSA )
{
ret = rsa_gen_key( pk_rsa( key ), ctr_drbg_random, &ctr_drbg,
opt.rsa_keysize, 65537 );
if( ret != 0 )
{
printf( " failed\n ! rsa_gen_key returned -0x%04x", -ret );
goto exit;
}
}
else
#endif /* POLARSSL_RSA_C */
#if defined(POLARSSL_ECP_C)
if( opt.type == POLARSSL_PK_ECKEY )
{
ret = ecp_gen_key( opt.ec_curve, pk_ec( key ),
ctr_drbg_random, &ctr_drbg );
if( ret != 0 )
{
printf( " failed\n ! rsa_gen_key returned -0x%04x", -ret );
goto exit;
}
}
else
#endif /* POLARSSL_ECP_C */
{
printf( " failed\n ! key type not supported\n" );
goto exit;
}
/*
* 1.2 Print the key
*/
printf( " ok\n . Key information:\n" );
#if defined(POLARSSL_RSA_C)
if( pk_get_type( &key ) == POLARSSL_PK_RSA )
{
rsa_context *rsa = pk_rsa( key );
mpi_write_file( "N: ", &rsa->N, 16, NULL );
mpi_write_file( "E: ", &rsa->E, 16, NULL );
mpi_write_file( "D: ", &rsa->D, 16, NULL );
mpi_write_file( "P: ", &rsa->P, 16, NULL );
mpi_write_file( "Q: ", &rsa->Q, 16, NULL );
mpi_write_file( "DP: ", &rsa->DP, 16, NULL );
mpi_write_file( "DQ: ", &rsa->DQ, 16, NULL );
mpi_write_file( "QP: ", &rsa->QP, 16, NULL );
}
else
#endif
#if defined(POLARSSL_ECP_C)
if( pk_get_type( &key ) == POLARSSL_PK_ECKEY )
{
ecp_keypair *ecp = pk_ec( key );
printf( "curve: %s\n",
ecp_curve_info_from_grp_id( ecp->grp.id )->name );
mpi_write_file( "X_Q: ", &ecp->Q.X, 16, NULL );
mpi_write_file( "Y_Q: ", &ecp->Q.Y, 16, NULL );
mpi_write_file( "D: ", &ecp->d , 16, NULL );
}
else
#endif
printf(" ! key type not supported\n");
write_private_key( &key, opt.filename );
exit:
if( ret != 0 && ret != 1)
{
#ifdef POLARSSL_ERROR_C
polarssl_strerror( ret, buf, sizeof( buf ) );
printf( " - %s\n", buf );
#else
printf("\n");
#endif
}
pk_free( &key );
ctr_drbg_free( &ctr_drbg );
entropy_free( &entropy );
#if defined(_WIN32)
printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_PK_WRITE_C && POLARSSL_FS_IO */
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