library/x509write.c - security/mbedtls - Rivoreo Source Code Repositories

 /*
  * X509 buffer writing functionality
  *
  *  Copyright (C) 2006-2012, 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.
  */

 #include "polarssl/config.h"

 #if defined(POLARSSL_X509_WRITE_C)

 #include "polarssl/asn1write.h"
 #include "polarssl/x509write.h"
 #include "polarssl/x509.h"
 #include "polarssl/sha1.h"
 #include "polarssl/sha2.h"
 #include "polarssl/sha4.h"
 #include "polarssl/md4.h"
 #include "polarssl/md5.h"

 int x509_write_pubkey_der( unsigned char *buf, size_t size, rsa_context *rsa )
 {
     int ret;
     unsigned char *c;
     size_t len = 0;

     c = buf + size - 1;

     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );

     ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     if( c - buf < 1 )
         return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );

     *--c = 0;
     len += 1;

     ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );

     ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, OID_PKCS1_RSA ) );

     ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     return( len );
 }

 int x509_write_key_der( unsigned char *buf, size_t size, rsa_context *rsa )
 {
     int ret;
     unsigned char *c;
     size_t len = 0;

     c = buf + size - 1;

     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
     ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
     ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) );

     ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     // TODO: Make NON RSA Specific variant later on
 /*    *--c = 0;
     len += 1;

     len += asn1_write_len( &c, len);
     len += asn1_write_tag( &c, ASN1_BIT_STRING );

     len += asn1_write_oid( &c, OID_PKCS1_RSA );

     len += asn1_write_int( &c, 0 );

     len += asn1_write_len( &c, len);
     len += asn1_write_tag( &c, ASN1_CONSTRUCTED | ASN1_SEQUENCE );*/

 /*    for(i = 0; i < len; ++i)
     {
         if (i % 16 == 0 ) printf("\n");
         printf("%02x ", c[i]);
     }
     printf("\n");*/

     return( len );
 }

 int x509_write_name( unsigned char **p, unsigned char *start, char *oid,
                      char *name )
 {
     int ret;
     size_t string_len = 0;
     size_t oid_len = 0;
     size_t len = 0;

     // Write PrintableString for all except OID_PKCS9_EMAIL
     //
     if( OID_SIZE( OID_PKCS9_EMAIL ) == strlen( oid ) &&
         memcmp( oid, OID_PKCS9_EMAIL, strlen( oid ) ) == 0 )
     {
         ASN1_CHK_ADD( string_len, asn1_write_ia5_string( p, start, name ) );
     }
     else
         ASN1_CHK_ADD( string_len, asn1_write_printable_string( p, start, name ) );

     // Write OID
     //
     ASN1_CHK_ADD( oid_len, asn1_write_oid( p, start, oid ) );

     len = oid_len + string_len;
     ASN1_CHK_ADD( len, asn1_write_len( p, start, oid_len + string_len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) );

     return( len );
 }

 /*
  * Wrapper for x509 hashes.
  *
  * \param out   Buffer to receive the hash (Should be at least 64 bytes)
  */
 static void x509_hash( const unsigned char *in, size_t len, int alg,
                        unsigned char *out )
 {
     switch( alg )
     {
 #if defined(POLARSSL_MD2_C)
         case SIG_RSA_MD2    :  md2( in, len, out ); break;
 #endif
 #if defined(POLARSSL_MD4_C)
         case SIG_RSA_MD4    :  md4( in, len, out ); break;
 #endif
 #if defined(POLARSSL_MD5_C)
         case SIG_RSA_MD5    :  md5( in, len, out ); break;
 #endif
 #if defined(POLARSSL_SHA1_C)
         case SIG_RSA_SHA1   : sha1( in, len, out ); break;
 #endif
 #if defined(POLARSSL_SHA2_C)
         case SIG_RSA_SHA224 : sha2( in, len, out, 1 ); break;
         case SIG_RSA_SHA256 : sha2( in, len, out, 0 ); break;
 #endif
 #if defined(POLARSSL_SHA4_C)
         case SIG_RSA_SHA384 : sha4( in, len, out, 1 ); break;
         case SIG_RSA_SHA512 : sha4( in, len, out, 0 ); break;
 #endif
         default:
             memset( out, '\xFF', 64 );
             break;
     }
 }

 int x509_write_sig( unsigned char **p, unsigned char *start, char *oid,
                     unsigned char *sig, size_t size )
 {
     int ret;
     size_t len = 0;

     if( *p - start < (int) size + 1 )
         return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );

     len = size;
     (*p) -= len;
     memcpy( *p, sig, len );

     *--(*p) = 0;
     len += 1;

     ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );

     // Write OID
     //
     ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid ) );

     return( len );
 }

 int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa,
                          x509_req_name *req_name, int hash_id )
 {
     int ret;
     char sig_oid[10];
     unsigned char *c, *c2;
     unsigned char hash[64];
     unsigned char sig[POLARSSL_MPI_MAX_SIZE];
     unsigned char tmp_buf[2048];
     size_t sub_len = 0, pub_len = 0, sig_len = 0;
     size_t len = 0;
     x509_req_name *cur = req_name;

     c = tmp_buf + 2048 - 1;

     ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, 0 ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) );

     ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->E ) );
     ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->N ) );

     ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
     ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     if( c - tmp_buf < 1 )
         return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );

     *--c = 0;
     pub_len += 1;

     ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
     ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_BIT_STRING ) );

     ASN1_CHK_ADD( pub_len, asn1_write_algorithm_identifier( &c, tmp_buf, OID_PKCS1_RSA ) );

     len += pub_len;
     ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, pub_len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     while( cur != NULL )
     {
         ASN1_CHK_ADD( sub_len, x509_write_name( &c, tmp_buf, cur->oid, cur->name ) );

         cur = cur->next;
     }

     len += sub_len;
     ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, sub_len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     ASN1_CHK_ADD( len, asn1_write_int( &c, tmp_buf, 0 ) );

     ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     x509_hash( c, len, hash_id, hash );

     rsa_pkcs1_sign( rsa, NULL, NULL, RSA_PRIVATE, hash_id, 0, hash, sig );

     // Generate correct OID
     //
     memcpy( sig_oid, OID_PKCS1, 8 );
     sig_oid[8] = hash_id;
     sig_oid[9] = '\0';

     c2 = buf + size - 1;
     ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, sig_oid, sig, rsa->len ) );

     c2 -= len;
     memcpy( c2, c, len );

     len += sig_len;
     ASN1_CHK_ADD( len, asn1_write_len( &c2, buf, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( &c2, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );

     return( len );
 }

 #endif
	/*
	* X509 buffer writing functionality
	*
	* Copyright (C) 2006-2012, 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.
	*/

	#include "polarssl/config.h"

	#if defined(POLARSSL_X509_WRITE_C)

	#include "polarssl/asn1write.h"
	#include "polarssl/x509write.h"
	#include "polarssl/x509.h"
	#include "polarssl/sha1.h"
	#include "polarssl/sha2.h"
	#include "polarssl/sha4.h"
	#include "polarssl/md4.h"
	#include "polarssl/md5.h"

	int x509_write_pubkey_der( unsigned char buf, size_t size, rsa_context rsa )
	{
	int ret;
	unsigned char *c;
	size_t len = 0;

	c = buf + size - 1;

	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );

	ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	if( c - buf < 1 )
	return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );

	*--c = 0;
	len += 1;

	ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );

	ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, OID_PKCS1_RSA ) );

	ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	return( len );
	}

	int x509_write_key_der( unsigned char buf, size_t size, rsa_context rsa )
	{
	int ret;
	unsigned char *c;
	size_t len = 0;

	c = buf + size - 1;

	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
	ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
	ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) );

	ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	// TODO: Make NON RSA Specific variant later on
	/* *--c = 0;
	len += 1;

	len += asn1_write_len( &c, len);
	len += asn1_write_tag( &c, ASN1_BIT_STRING );

	len += asn1_write_oid( &c, OID_PKCS1_RSA );

	len += asn1_write_int( &c, 0 );

	len += asn1_write_len( &c, len);
	len += asn1_write_tag( &c, ASN1_CONSTRUCTED \| ASN1_SEQUENCE );*/

	/* for(i = 0; i < len; ++i)
	{
	if (i % 16 == 0 ) printf("\n");
	printf("%02x ", c[i]);
	}
	printf("\n");*/

	return( len );
	}

	int x509_write_name( unsigned char *p, unsigned char start, char *oid,
	char *name )
	{
	int ret;
	size_t string_len = 0;
	size_t oid_len = 0;
	size_t len = 0;

	// Write PrintableString for all except OID_PKCS9_EMAIL
	//
	if( OID_SIZE( OID_PKCS9_EMAIL ) == strlen( oid ) &&
	memcmp( oid, OID_PKCS9_EMAIL, strlen( oid ) ) == 0 )
	{
	ASN1_CHK_ADD( string_len, asn1_write_ia5_string( p, start, name ) );
	}
	else
	ASN1_CHK_ADD( string_len, asn1_write_printable_string( p, start, name ) );

	// Write OID
	//
	ASN1_CHK_ADD( oid_len, asn1_write_oid( p, start, oid ) );

	len = oid_len + string_len;
	ASN1_CHK_ADD( len, asn1_write_len( p, start, oid_len + string_len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED \| ASN1_SET ) );

	return( len );
	}

	/*
	* Wrapper for x509 hashes.
	*
	* \param out Buffer to receive the hash (Should be at least 64 bytes)
	*/
	static void x509_hash( const unsigned char *in, size_t len, int alg,
	unsigned char *out )
	{
	switch( alg )
	{
	#if defined(POLARSSL_MD2_C)
	case SIG_RSA_MD2 : md2( in, len, out ); break;
	#endif
	#if defined(POLARSSL_MD4_C)
	case SIG_RSA_MD4 : md4( in, len, out ); break;
	#endif
	#if defined(POLARSSL_MD5_C)
	case SIG_RSA_MD5 : md5( in, len, out ); break;
	#endif
	#if defined(POLARSSL_SHA1_C)
	case SIG_RSA_SHA1 : sha1( in, len, out ); break;
	#endif
	#if defined(POLARSSL_SHA2_C)
	case SIG_RSA_SHA224 : sha2( in, len, out, 1 ); break;
	case SIG_RSA_SHA256 : sha2( in, len, out, 0 ); break;
	#endif
	#if defined(POLARSSL_SHA4_C)
	case SIG_RSA_SHA384 : sha4( in, len, out, 1 ); break;
	case SIG_RSA_SHA512 : sha4( in, len, out, 0 ); break;
	#endif
	default:
	memset( out, '\xFF', 64 );
	break;
	}
	}

	int x509_write_sig( unsigned char *p, unsigned char start, char *oid,
	unsigned char *sig, size_t size )
	{
	int ret;
	size_t len = 0;

	if( *p - start < (int) size + 1 )
	return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );

	len = size;
	(*p) -= len;
	memcpy( *p, sig, len );

	--(p) = 0;
	len += 1;

	ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );

	// Write OID
	//
	ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid ) );

	return( len );
	}

	int x509_write_cert_req( unsigned char buf, size_t size, rsa_context rsa,
	x509_req_name *req_name, int hash_id )
	{
	int ret;
	char sig_oid[10];
	unsigned char c, c2;
	unsigned char hash[64];
	unsigned char sig[POLARSSL_MPI_MAX_SIZE];
	unsigned char tmp_buf[2048];
	size_t sub_len = 0, pub_len = 0, sig_len = 0;
	size_t len = 0;
	x509_req_name *cur = req_name;

	c = tmp_buf + 2048 - 1;

	ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, 0 ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED \| ASN1_CONTEXT_SPECIFIC ) );

	ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->E ) );
	ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->N ) );

	ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
	ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	if( c - tmp_buf < 1 )
	return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );

	*--c = 0;
	pub_len += 1;

	ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
	ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_BIT_STRING ) );

	ASN1_CHK_ADD( pub_len, asn1_write_algorithm_identifier( &c, tmp_buf, OID_PKCS1_RSA ) );

	len += pub_len;
	ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, pub_len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	while( cur != NULL )
	{
	ASN1_CHK_ADD( sub_len, x509_write_name( &c, tmp_buf, cur->oid, cur->name ) );

	cur = cur->next;
	}

	len += sub_len;
	ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, sub_len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	ASN1_CHK_ADD( len, asn1_write_int( &c, tmp_buf, 0 ) );

	ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	x509_hash( c, len, hash_id, hash );

	rsa_pkcs1_sign( rsa, NULL, NULL, RSA_PRIVATE, hash_id, 0, hash, sig );

	// Generate correct OID
	//
	memcpy( sig_oid, OID_PKCS1, 8 );
	sig_oid[8] = hash_id;
	sig_oid[9] = '\0';

	c2 = buf + size - 1;
	ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, sig_oid, sig, rsa->len ) );

	c2 -= len;
	memcpy( c2, c, len );

	len += sig_len;
	ASN1_CHK_ADD( len, asn1_write_len( &c2, buf, len ) );
	ASN1_CHK_ADD( len, asn1_write_tag( &c2, buf, ASN1_CONSTRUCTED \| ASN1_SEQUENCE ) );

	return( len );
	}

	#endif