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-rw-r--r--lib/dns/ds.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/dns/ds.c b/lib/dns/ds.c
new file mode 100644
index 0000000..feb73a7
--- /dev/null
+++ b/lib/dns/ds.c
@@ -0,0 +1,135 @@
+/*
+ * 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/util.h>
+
+#include <dns/ds.h>
+#include <dns/fixedname.h>
+#include <dns/name.h>
+#include <dns/rdata.h>
+#include <dns/rdatastruct.h>
+#include <dns/result.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);
+}