/*
* Certificate request generation
*
* Copyright (C) 2006-2011, ARM Limited, All Rights Reserved
*
* This file is part of mbed TLS (https://tls.mbed.org)
*
* 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
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#include <stdio.h>
#define polarssl_printf printf
#endif
#if !defined(POLARSSL_X509_CSR_WRITE_C) || !defined(POLARSSL_FS_IO) || \
!defined(POLARSSL_PK_PARSE_C) || !defined(POLARSSL_SHA256_C) || \
!defined(POLARSSL_ENTROPY_C) || !defined(POLARSSL_CTR_DRBG_C) || \
!defined(POLARSSL_PEM_WRITE_C)
int main( void )
{
polarssl_printf( "POLARSSL_X509_CSR_WRITE_C and/or POLARSSL_FS_IO and/or "
"POLARSSL_PK_PARSE_C and/or POLARSSL_SHA256_c and/or "
"POLARSSL_ENTROPY_C and/or POLARSSL_CTR_DRBG_C and/or "
"POLARSSL_PEM_WRITE_C "
"not defined.\n");
return( 0 );
}
#else
#include "polarssl/x509_csr.h"
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/error.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define DFL_FILENAME "keyfile.key"
#define DFL_DEBUG_LEVEL 0
#define DFL_OUTPUT_FILENAME "cert.req"
#define DFL_SUBJECT_NAME "CN=Cert,O=mbed TLS,C=UK"
#define DFL_KEY_USAGE 0
#define DFL_NS_CERT_TYPE 0
#define USAGE \
"\n usage: cert_req param=<>...\n" \
"\n acceptable parameters:\n" \
" filename=%%s default: keyfile.key\n" \
" debug_level=%%d default: 0 (disabled)\n" \
" output_file=%%s default: cert.req\n" \
" subject_name=%%s default: CN=Cert,O=mbed TLS,C=UK\n" \
" key_usage=%%s default: (empty)\n" \
" Comma-separated-list of values:\n" \
" digital_signature\n" \
" non_repudiation\n" \
" key_encipherment\n" \
" data_encipherment\n" \
" key_agreement\n" \
" key_certificate_sign\n" \
" crl_sign\n" \
" ns_cert_type=%%s default: (empty)\n" \
" Comma-separated-list of values:\n" \
" ssl_client\n" \
" ssl_server\n" \
" email\n" \
" object_signing\n" \
" ssl_ca\n" \
" email_ca\n" \
" object_signing_ca\n" \
"\n"
/*
* global options
*/
struct options
{
const char *filename; /* filename of the key file */
int debug_level; /* level of debugging */
const char *output_file; /* where to store the constructed key file */
const char *subject_name; /* subject name for certificate request */
unsigned char key_usage; /* key usage flags */
unsigned char ns_cert_type; /* NS cert type */
} opt;
int write_certificate_request( x509write_csr *req, const char *output_file,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
FILE *f;
unsigned char output_buf[4096];
size_t len = 0;
memset( output_buf, 0, 4096 );
if( ( ret = x509write_csr_pem( req, output_buf, 4096, f_rng, p_rng ) ) < 0 )
return( ret );
len = strlen( (char *) output_buf );
if( ( f = fopen( output_file, "w" ) ) == NULL )
return( -1 );
if( fwrite( output_buf, 1, len, f ) != len )
{
fclose( f );
return( -1 );
}
fclose( f );
return( 0 );
}
int main( int argc, char *argv[] )
{
int ret = 0;
pk_context key;
char buf[1024];
int i;
char *p, *q, *r;
x509write_csr req;
entropy_context entropy;
ctr_drbg_context ctr_drbg;
const char *pers = "csr example app";
/*
* Set to sane values
*/
x509write_csr_init( &req );
x509write_csr_set_md_alg( &req, POLARSSL_MD_SHA256 );
pk_init( &key );
memset( buf, 0, sizeof( buf ) );
if( argc == 0 )
{
usage:
polarssl_printf( USAGE );
ret = 1;
goto exit;
}
opt.filename = DFL_FILENAME;
opt.debug_level = DFL_DEBUG_LEVEL;
opt.output_file = DFL_OUTPUT_FILENAME;
opt.subject_name = DFL_SUBJECT_NAME;
opt.key_usage = DFL_KEY_USAGE;
opt.ns_cert_type = DFL_NS_CERT_TYPE;
for( i = 1; i < argc; i++ )
{
p = argv[i];
if( ( q = strchr( p, '=' ) ) == NULL )
goto usage;
*q++ = '\0';
if( strcmp( p, "filename" ) == 0 )
opt.filename = q;
else if( strcmp( p, "output_file" ) == 0 )
opt.output_file = q;
else if( strcmp( p, "debug_level" ) == 0 )
{
opt.debug_level = atoi( q );
if( opt.debug_level < 0 || opt.debug_level > 65535 )
goto usage;
}
else if( strcmp( p, "subject_name" ) == 0 )
{
opt.subject_name = q;
}
else if( strcmp( p, "key_usage" ) == 0 )
{
while( q != NULL )
{
if( ( r = strchr( q, ',' ) ) != NULL )
*r++ = '\0';
if( strcmp( q, "digital_signature" ) == 0 )
opt.key_usage |= KU_DIGITAL_SIGNATURE;
else if( strcmp( q, "non_repudiation" ) == 0 )
opt.key_usage |= KU_NON_REPUDIATION;
else if( strcmp( q, "key_encipherment" ) == 0 )
opt.key_usage |= KU_KEY_ENCIPHERMENT;
else if( strcmp( q, "data_encipherment" ) == 0 )
opt.key_usage |= KU_DATA_ENCIPHERMENT;
else if( strcmp( q, "key_agreement" ) == 0 )
opt.key_usage |= KU_KEY_AGREEMENT;
else if( strcmp( q, "key_cert_sign" ) == 0 )
opt.key_usage |= KU_KEY_CERT_SIGN;
else if( strcmp( q, "crl_sign" ) == 0 )
opt.key_usage |= KU_CRL_SIGN;
else
goto usage;
q = r;
}
}
else if( strcmp( p, "ns_cert_type" ) == 0 )
{
while( q != NULL )
{
if( ( r = strchr( q, ',' ) ) != NULL )
*r++ = '\0';
if( strcmp( q, "ssl_client" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_SSL_CLIENT;
else if( strcmp( q, "ssl_server" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_SSL_SERVER;
else if( strcmp( q, "email" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_EMAIL;
else if( strcmp( q, "object_signing" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_OBJECT_SIGNING;
else if( strcmp( q, "ssl_ca" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_SSL_CA;
else if( strcmp( q, "email_ca" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_EMAIL_CA;
else if( strcmp( q, "object_signing_ca" ) == 0 )
opt.ns_cert_type |= NS_CERT_TYPE_OBJECT_SIGNING_CA;
else
goto usage;
q = r;
}
}
else
goto usage;
}
if( opt.key_usage )
x509write_csr_set_key_usage( &req, opt.key_usage );
if( opt.ns_cert_type )
x509write_csr_set_ns_cert_type( &req, opt.ns_cert_type );
/*
* 0. Seed the PRNG
*/
polarssl_printf( " . Seeding the random number generator..." );
fflush( stdout );
entropy_init( &entropy );
if( ( ret = ctr_drbg_init( &ctr_drbg, entropy_func, &entropy,
(const unsigned char *) pers,
strlen( pers ) ) ) != 0 )
{
polarssl_printf( " failed\n ! ctr_drbg_init returned %d", ret );
goto exit;
}
polarssl_printf( " ok\n" );
/*
* 1.0. Check the subject name for validity
*/
polarssl_printf( " . Checking subjet name..." );
fflush( stdout );
if( ( ret = x509write_csr_set_subject_name( &req, opt.subject_name ) ) != 0 )
{
polarssl_printf( " failed\n ! x509write_csr_set_subject_name returned %d", ret );
goto exit;
}
polarssl_printf( " ok\n" );
/*
* 1.1. Load the key
*/
polarssl_printf( " . Loading the private key ..." );
fflush( stdout );
ret = pk_parse_keyfile( &key, opt.filename, NULL );
if( ret != 0 )
{
polarssl_printf( " failed\n ! pk_parse_keyfile returned %d", ret );
goto exit;
}
x509write_csr_set_key( &req, &key );
polarssl_printf( " ok\n" );
/*
* 1.2. Writing the request
*/
polarssl_printf( " . Writing the certificate request ..." );
fflush( stdout );
if( ( ret = write_certificate_request( &req, opt.output_file,
ctr_drbg_random, &ctr_drbg ) ) != 0 )
{
polarssl_printf( " failed\n ! write_certifcate_request %d", ret );
goto exit;
}
polarssl_printf( " ok\n" );
exit:
if( ret != 0 && ret != 1)
{
#ifdef POLARSSL_ERROR_C
polarssl_strerror( ret, buf, sizeof( buf ) );
polarssl_printf( " - %s\n", buf );
#else
polarssl_printf("\n");
#endif
}
x509write_csr_free( &req );
pk_free( &key );
ctr_drbg_free( &ctr_drbg );
entropy_free( &entropy );
#if defined(_WIN32)
polarssl_printf( " + Press Enter to exit this program.\n" );
fflush( stdout ); getchar();
#endif
return( ret );
}
#endif /* POLARSSL_X509_CSR_WRITE_C && POLARSSL_PK_PARSE_C && POLARSSL_FS_IO &&
POLARSSL_ENTROPY_C && POLARSSL_CTR_DRBG_C && POLARSSL_PEM_WRITE_C */