mirror of
https://gitlab.isc.org/isc-projects/bind9
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126 lines
2.5 KiB
C
126 lines
2.5 KiB
C
/*
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* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* See the COPYRIGHT file distributed with this work for additional
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* information regarding copyright ownership.
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*/
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/*! \file */
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#include <string.h>
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#include <isc/buffer.h>
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#include <isc/region.h>
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#include <isc/md.h>
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#include <isc/util.h>
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#include <dns/ds.h>
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#include <dns/fixedname.h>
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#include <dns/name.h>
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#include <dns/rdata.h>
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#include <dns/rdatastruct.h>
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#include <dns/result.h>
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#include <dst/dst.h>
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isc_result_t
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dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key,
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dns_dsdigest_t digest_type, unsigned char *buffer,
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dns_rdata_t *rdata)
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{
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dns_fixedname_t fname;
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dns_name_t *name;
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unsigned char digest[ISC_MAX_MD_SIZE];
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unsigned int digestlen;
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isc_region_t r;
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isc_buffer_t b;
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dns_rdata_ds_t ds;
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isc_md_t *md;
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isc_md_type_t md_type = 0;
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isc_result_t ret;
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REQUIRE(key != NULL);
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REQUIRE(key->type == dns_rdatatype_dnskey ||
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key->type == dns_rdatatype_cdnskey);
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if (!dst_ds_digest_supported(digest_type)) {
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return (ISC_R_NOTIMPLEMENTED);
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}
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switch (digest_type) {
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case DNS_DSDIGEST_SHA1:
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md_type = ISC_MD_SHA1;
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break;
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case DNS_DSDIGEST_SHA384:
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md_type = ISC_MD_SHA384;
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break;
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case DNS_DSDIGEST_SHA256:
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md_type = ISC_MD_SHA256;
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break;
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default:
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INSIST(0);
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ISC_UNREACHABLE();
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}
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name = dns_fixedname_initname(&fname);
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(void)dns_name_downcase(owner, name, NULL);
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memset(buffer, 0, DNS_DS_BUFFERSIZE);
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isc_buffer_init(&b, buffer, DNS_DS_BUFFERSIZE);
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md = isc_md_new();
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if (md == NULL) {
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return (ISC_R_NOMEMORY);
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}
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ret = isc_md_init(md, md_type);
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if (ret != ISC_R_SUCCESS) {
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goto end;
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}
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dns_name_toregion(name, &r);
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ret = isc_md_update(md, r.base, r.length);
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if (ret != ISC_R_SUCCESS) {
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goto end;
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}
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dns_rdata_toregion(key, &r);
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INSIST(r.length >= 4);
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ret = isc_md_update(md, r.base, r.length);
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if (ret != ISC_R_SUCCESS) {
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goto end;
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}
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ret = isc_md_final(md, digest, &digestlen);
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if (ret != ISC_R_SUCCESS) {
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goto end;
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}
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ds.mctx = NULL;
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ds.common.rdclass = key->rdclass;
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ds.common.rdtype = dns_rdatatype_ds;
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ds.algorithm = r.base[3];
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ds.key_tag = dst_region_computeid(&r);
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ds.digest_type = digest_type;
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ds.digest = digest;
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ds.length = digestlen;
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ret = dns_rdata_fromstruct(rdata, key->rdclass, dns_rdatatype_ds,
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&ds, &b);
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end:
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if (md != NULL) {
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isc_md_free(md);
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}
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return (ret);
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}
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