mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-27 11:14:20 +01:00
380 lines
11 KiB
C
380 lines
11 KiB
C
/*
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* X509 buffer writing functionality
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*
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* Copyright (C) 2006-2013, 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/md.h"
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#include "polarssl/oid.h"
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#if defined(POLARSSL_MEMORY_C)
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#include "polarssl/memory.h"
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#else
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#include <stdlib.h>
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#define polarssl_malloc malloc
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#define polarssl_free free
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#endif
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void x509write_csr_init( x509_csr *ctx )
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{
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memset( ctx, 0, sizeof(x509_csr) );
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}
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void x509write_csr_free( x509_csr *ctx )
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{
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x509_req_name *cur;
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while( ( cur = ctx->subject ) != NULL )
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{
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ctx->subject = cur->next;
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polarssl_free( cur );
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}
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memset( ctx, 0, sizeof(x509_csr) );
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}
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void x509write_csr_set_md_alg( x509_csr *ctx, md_type_t md_alg )
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{
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ctx->md_alg = md_alg;
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}
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void x509write_csr_set_rsa_key( x509_csr *ctx, rsa_context *rsa )
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{
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ctx->rsa = rsa;
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}
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int x509write_csr_set_subject_name( x509_csr *ctx, char *subject_name )
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{
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int ret = 0;
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char *s = subject_name, *c = s;
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char *end = s + strlen( s );
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char *oid = NULL;
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int in_tag = 1;
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x509_req_name *cur;
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while( ctx->subject )
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{
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cur = ctx->subject;
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ctx->subject = ctx->subject->next;
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polarssl_free( cur );
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}
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while( c <= end )
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{
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if( in_tag && *c == '=' )
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{
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if( memcmp( s, "CN", 2 ) == 0 && c - s == 2 )
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oid = OID_AT_CN;
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else if( memcmp( s, "C", 1 ) == 0 && c - s == 1 )
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oid = OID_AT_COUNTRY;
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else if( memcmp( s, "O", 1 ) == 0 && c - s == 1 )
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oid = OID_AT_ORGANIZATION;
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else if( memcmp( s, "L", 1 ) == 0 && c - s == 1 )
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oid = OID_AT_LOCALITY;
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else if( memcmp( s, "R", 1 ) == 0 && c - s == 1 )
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oid = OID_PKCS9_EMAIL;
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else if( memcmp( s, "OU", 2 ) == 0 && c - s == 2 )
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oid = OID_AT_ORG_UNIT;
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else if( memcmp( s, "ST", 2 ) == 0 && c - s == 2 )
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oid = OID_AT_STATE;
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else
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{
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ret = POLARSSL_ERR_X509WRITE_UNKNOWN_OID;
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goto exit;
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}
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s = c + 1;
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in_tag = 0;
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}
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if( !in_tag && ( *c == ',' || c == end ) )
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{
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if( c - s > 127 )
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{
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ret = POLARSSL_ERR_X509WRITE_BAD_INPUT_DATA;
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goto exit;
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}
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cur = polarssl_malloc( sizeof(x509_req_name) );
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if( cur == NULL )
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{
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ret = POLARSSL_ERR_X509WRITE_MALLOC_FAILED;
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goto exit;
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}
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memset( cur, 0, sizeof(x509_req_name) );
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cur->next = ctx->subject;
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ctx->subject = cur;
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strncpy( cur->oid, oid, strlen( oid ) );
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strncpy( cur->name, s, c - s );
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s = c + 1;
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in_tag = 1;
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}
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c++;
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}
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exit:
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return( ret );
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}
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int x509write_pubkey_der( rsa_context *rsa, unsigned char *buf, size_t size )
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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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/*
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* RSAPublicKey ::= SEQUENCE {
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* modulus INTEGER, -- n
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* publicExponent INTEGER -- e
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* }
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*/
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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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/*
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* SubjectPublicKeyInfo ::= SEQUENCE {
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* algorithm AlgorithmIdentifier,
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* subjectPublicKey BIT STRING }
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*/
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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 x509write_key_der( rsa_context *rsa, unsigned char *buf, size_t size )
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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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static 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 for all except OID_PKCS9_EMAIL
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//
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if( OID_SIZE( OID_PKCS9_EMAIL ) == strlen( oid ) &&
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memcmp( oid, OID_PKCS9_EMAIL, strlen( oid ) ) == 0 )
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{
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ASN1_CHK_ADD( string_len, asn1_write_ia5_string( p, start, name ) );
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}
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else
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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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static int x509_write_sig( unsigned char **p, unsigned char *start,
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const char *oid, 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 x509write_csr_der( x509_csr *ctx, unsigned char *buf, size_t size )
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{
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int ret;
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const char *sig_oid;
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unsigned char *c, *c2;
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unsigned char hash[64];
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unsigned char sig[POLARSSL_MPI_MAX_SIZE];
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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 = ctx->subject;
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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, &ctx->rsa->E ) );
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ASN1_CHK_ADD( pub_len, asn1_write_mpi( &c, tmp_buf, &ctx->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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/*
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* AlgorithmIdentifier ::= SEQUENCE {
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* algorithm OBJECT IDENTIFIER,
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* parameters ANY DEFINED BY algorithm OPTIONAL }
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*/
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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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/*
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* Version ::= INTEGER { v1(0), v2(1), v3(2) }
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*/
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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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md( md_info_from_type( ctx->md_alg ), c, len, hash );
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rsa_pkcs1_sign( ctx->rsa, NULL, NULL, RSA_PRIVATE, ctx->md_alg, 0, hash, sig );
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// Generate correct OID
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//
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ret = oid_get_oid_by_sig_alg( POLARSSL_PK_RSA, ctx->md_alg, &sig_oid );
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c2 = buf + size - 1;
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ASN1_CHK_ADD( sig_len, x509_write_sig( &c2, buf, sig_oid, sig, ctx->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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