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https://github.com/Mbed-TLS/mbedtls.git
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- Added preliminary ASN.1 buffer writing support
- Added preliminary X509 Certificate Request writing support - Added key_app_writer example application - Added cert_req example application
This commit is contained in:
Paul Bakker
233
library/x509write.c
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233
library/x509write.c
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/*
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* X509 buffer writing functionality
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*
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* Copyright (C) 2006-2012, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_X509_WRITE_C)
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#include "polarssl/asn1write.h"
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#include "polarssl/x509write.h"
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#include "polarssl/x509.h"
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#include "polarssl/sha1.h"
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int x509_write_pubkey_der( unsigned char *buf, size_t size, rsa_context *rsa )
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{
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int ret;
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unsigned char *c;
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size_t len = 0;
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c = buf + size - 1;
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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if( c - buf < 1 )
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return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
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*--c = 0;
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len += 1;
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_BIT_STRING ) );
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ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( &c, buf, OID_PKCS1_RSA ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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return( len );
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}
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int x509_write_key_der( unsigned char *buf, size_t size, rsa_context *rsa )
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{
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int ret;
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unsigned char *c;
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size_t len = 0;
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c = buf + size - 1;
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->QP ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DQ ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->DP ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->Q ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->P ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->D ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->E ) );
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ASN1_CHK_ADD( len, asn1_write_mpi( &c, buf, &rsa->N ) );
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ASN1_CHK_ADD( len, asn1_write_int( &c, buf, 0 ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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// TODO: Make NON RSA Specific variant later on
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/* *--c = 0;
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len += 1;
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len += asn1_write_len( &c, len);
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len += asn1_write_tag( &c, ASN1_BIT_STRING );
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len += asn1_write_oid( &c, OID_PKCS1_RSA );
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len += asn1_write_int( &c, 0 );
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len += asn1_write_len( &c, len);
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len += asn1_write_tag( &c, ASN1_CONSTRUCTED | ASN1_SEQUENCE );*/
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/* for(i = 0; i < len; ++i)
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{
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if (i % 16 == 0 ) printf("\n");
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printf("%02x ", c[i]);
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}
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printf("\n");*/
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return( len );
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}
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int x509_write_name( unsigned char **p, unsigned char *start, char *oid,
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char *name )
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{
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int ret;
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size_t string_len = 0;
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size_t oid_len = 0;
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size_t len = 0;
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// Write PrintableString
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//
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ASN1_CHK_ADD( string_len, asn1_write_printable_string( p, start, name ) );
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// Write OID
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//
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ASN1_CHK_ADD( oid_len, asn1_write_oid( p, start, oid ) );
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len = oid_len + string_len;
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ASN1_CHK_ADD( len, asn1_write_len( p, start, oid_len + string_len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) );
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return( len );
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}
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int x509_write_sig( unsigned char **p, unsigned char *start, char *oid,
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unsigned char *sig, size_t size )
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{
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int ret;
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size_t len = 0;
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if( *p - start < (int) size + 1 )
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return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
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len = size;
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(*p) -= len;
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memcpy( *p, sig, len );
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*--(*p) = 0;
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len += 1;
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ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );
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// Write OID
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//
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ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid ) );
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return( len );
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}
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int x509_write_cert_req( unsigned char *buf, size_t size, rsa_context *rsa,
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x509_req_name *req_name )
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{
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int ret;
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unsigned char *c, *c2;
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unsigned char hash[20];
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unsigned char sig[512];
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unsigned char tmp_buf[2048];
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size_t sub_len = 0, pub_len = 0, sig_len = 0;
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size_t len = 0;
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x509_req_name *cur = req_name;
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c = tmp_buf + 2048 - 1;
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, 0 ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_CONTEXT_SPECIFIC ) );
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ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->E ) );
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ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &rsa->N ) );
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ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
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ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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if( c - tmp_buf < 1 )
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return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL );
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*--c = 0;
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pub_len += 1;
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ASN1_CHK_ADD( pub_len, asn1_write_len( &c, tmp_buf, pub_len ) );
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ASN1_CHK_ADD( pub_len, asn1_write_tag( &c, tmp_buf, ASN1_BIT_STRING ) );
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ASN1_CHK_ADD( pub_len, asn1_write_algorithm_identifier( &c, tmp_buf, OID_PKCS1_RSA ) );
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len += pub_len;
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, pub_len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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while( cur != NULL )
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{
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ASN1_CHK_ADD( sub_len, x509_write_name( &c, tmp_buf, cur->oid, cur->name ) );
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cur = cur->next;
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}
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len += sub_len;
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, sub_len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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ASN1_CHK_ADD( len, asn1_write_int( &c, tmp_buf, 0 ) );
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ASN1_CHK_ADD( len, asn1_write_len( &c, tmp_buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c, tmp_buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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sha1( c, len, hash );
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rsa_pkcs1_sign( rsa, NULL, NULL, RSA_PRIVATE, SIG_RSA_SHA1, 0, hash, sig );
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c2 = buf + size - 1;
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ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, OID_PKCS1_SHA1, sig, rsa->len ) );
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c2 -= len;
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memcpy( c2, c, len );
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len += sig_len;
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ASN1_CHK_ADD( len, asn1_write_len( &c2, buf, len ) );
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ASN1_CHK_ADD( len, asn1_write_tag( &c2, buf, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
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return( len );
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}
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#endif
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