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