244 lines
7.1 KiB
C
244 lines
7.1 KiB
C
/*
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* X.509 Certificate Signing Request writing
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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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/*
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* References:
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* - CSRs: PKCS#10 v1.7 aka RFC 2986
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* - attributes: PKCS#9 v2.0 aka RFC 2985
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*/
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#include "polarssl/config.h"
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#if defined(POLARSSL_X509_CSR_WRITE_C)
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#include "polarssl/x509_csr.h"
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#include "polarssl/oid.h"
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#include "polarssl/asn1write.h"
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#if defined(POLARSSL_PEM_WRITE_C)
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#include "polarssl/pem.h"
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#endif
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#include <string.h>
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#include <stdlib.h>
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void x509write_csr_init( x509write_csr *ctx )
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{
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memset( ctx, 0, sizeof(x509write_csr) );
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}
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void x509write_csr_free( x509write_csr *ctx )
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{
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asn1_free_named_data_list( &ctx->subject );
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asn1_free_named_data_list( &ctx->extensions );
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memset( ctx, 0, sizeof(x509write_csr) );
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}
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void x509write_csr_set_md_alg( x509write_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_key( x509write_csr *ctx, pk_context *key )
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{
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ctx->key = key;
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}
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int x509write_csr_set_subject_name( x509write_csr *ctx, char *subject_name )
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{
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return x509_string_to_names( &ctx->subject, subject_name );
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}
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int x509write_csr_set_extension( x509write_csr *ctx,
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const char *oid, size_t oid_len,
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const unsigned char *val, size_t val_len )
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{
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return x509_set_extension( &ctx->extensions, oid, oid_len,
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0, val, val_len );
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}
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int x509write_csr_set_key_usage( x509write_csr *ctx, unsigned char key_usage )
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{
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unsigned char buf[4];
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unsigned char *c;
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int ret;
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c = buf + 4;
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if( ( ret = asn1_write_bitstring( &c, buf, &key_usage, 7 ) ) != 4 )
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return( ret );
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ret = x509write_csr_set_extension( ctx, OID_KEY_USAGE,
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OID_SIZE( OID_KEY_USAGE ),
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buf, 4 );
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if( ret != 0 )
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return( ret );
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return( 0 );
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}
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int x509write_csr_set_ns_cert_type( x509write_csr *ctx,
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unsigned char ns_cert_type )
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{
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unsigned char buf[4];
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unsigned char *c;
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int ret;
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c = buf + 4;
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if( ( ret = asn1_write_bitstring( &c, buf, &ns_cert_type, 8 ) ) != 4 )
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return( ret );
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ret = x509write_csr_set_extension( ctx, OID_NS_CERT_TYPE,
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OID_SIZE( OID_NS_CERT_TYPE ),
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buf, 4 );
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if( ret != 0 )
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return( ret );
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return( 0 );
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}
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int x509write_csr_der( x509write_csr *ctx, unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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int ret;
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const char *sig_oid;
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size_t sig_oid_len = 0;
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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 pub_len = 0, sig_and_oid_len = 0, sig_len;
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size_t len = 0;
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pk_type_t pk_alg;
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/*
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* Prepare data to be signed in tmp_buf
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*/
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c = tmp_buf + sizeof( tmp_buf );
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ASN1_CHK_ADD( len, x509_write_extensions( &c, tmp_buf, ctx->extensions ) );
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if( len )
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{
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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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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_SET ) );
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ASN1_CHK_ADD( len, asn1_write_oid( &c, tmp_buf, OID_PKCS9_CSR_EXT_REQ,
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OID_SIZE( OID_PKCS9_CSR_EXT_REQ ) ) );
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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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}
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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_CONTEXT_SPECIFIC ) );
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ASN1_CHK_ADD( pub_len, pk_write_pubkey_der( ctx->key,
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tmp_buf, c - tmp_buf ) );
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c -= pub_len;
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len += pub_len;
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/*
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* Subject ::= Name
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*/
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ASN1_CHK_ADD( len, x509_write_names( &c, tmp_buf, ctx->subject ) );
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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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/*
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* Prepare signature
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*/
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md( md_info_from_type( ctx->md_alg ), c, len, hash );
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pk_alg = pk_get_type( ctx->key );
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if( pk_alg == POLARSSL_PK_ECKEY )
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pk_alg = POLARSSL_PK_ECDSA;
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if( ( ret = pk_sign( ctx->key, ctx->md_alg, hash, 0, sig, &sig_len,
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f_rng, p_rng ) ) != 0 ||
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( ret = oid_get_oid_by_sig_alg( pk_alg, ctx->md_alg,
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&sig_oid, &sig_oid_len ) ) != 0 )
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{
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return( ret );
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}
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/*
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* Write data to output buffer
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*/
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c2 = buf + size;
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ASN1_CHK_ADD( sig_and_oid_len, x509_write_sig( &c2, buf,
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sig_oid, sig_oid_len, sig, sig_len ) );
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c2 -= len;
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memcpy( c2, c, len );
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len += sig_and_oid_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( (int) len );
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}
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#define PEM_BEGIN_CSR "-----BEGIN CERTIFICATE REQUEST-----\n"
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#define PEM_END_CSR "-----END CERTIFICATE REQUEST-----\n"
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#if defined(POLARSSL_PEM_WRITE_C)
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int x509write_csr_pem( x509write_csr *ctx, unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng )
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{
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int ret;
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unsigned char output_buf[4096];
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size_t olen = 0;
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if( ( ret = x509write_csr_der( ctx, output_buf, sizeof(output_buf),
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f_rng, p_rng ) ) < 0 )
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{
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return( ret );
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}
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if( ( ret = pem_write_buffer( PEM_BEGIN_CSR, PEM_END_CSR,
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output_buf + sizeof(output_buf) - ret,
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ret, buf, size, &olen ) ) != 0 )
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{
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return( ret );
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}
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return( 0 );
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}
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#endif /* POLARSSL_PEM_WRITE_C */
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#endif /* POLARSSL_X509_CSR_WRITE_C */
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