1 /* $NetBSD: ds.c,v 1.1 2024/02/18 20:57:31 christos Exp $ */
2
3 /*
4 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
5 *
6 * SPDX-License-Identifier: MPL-2.0
7 *
8 * This Source Code Form is subject to the terms of the Mozilla Public
9 * License, v. 2.0. If a copy of the MPL was not distributed with this
10 * file, you can obtain one at https://mozilla.org/MPL/2.0/.
11 *
12 * See the COPYRIGHT file distributed with this work for additional
13 * information regarding copyright ownership.
14 */
15
16 /*! \file */
17
18 #include <string.h>
19
20 #include <isc/buffer.h>
21 #include <isc/md.h>
22 #include <isc/region.h>
23 #include <isc/util.h>
24
25 #include <dns/ds.h>
26 #include <dns/fixedname.h>
27 #include <dns/name.h>
28 #include <dns/rdata.h>
29 #include <dns/rdatastruct.h>
30 #include <dns/result.h>
31
32 #include <dst/dst.h>
33
34 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)35 dns_ds_fromkeyrdata(const dns_name_t *owner, dns_rdata_t *key,
36 dns_dsdigest_t digest_type, unsigned char *digest,
37 dns_rdata_ds_t *dsrdata) {
38 isc_result_t result;
39 dns_fixedname_t fname;
40 dns_name_t *name;
41 unsigned int digestlen;
42 isc_region_t r;
43 isc_md_t *md;
44 const isc_md_type_t *md_type = NULL;
45
46 REQUIRE(key != NULL);
47 REQUIRE(key->type == dns_rdatatype_dnskey ||
48 key->type == dns_rdatatype_cdnskey);
49
50 if (!dst_ds_digest_supported(digest_type)) {
51 return (ISC_R_NOTIMPLEMENTED);
52 }
53
54 switch (digest_type) {
55 case DNS_DSDIGEST_SHA1:
56 md_type = ISC_MD_SHA1;
57 break;
58
59 case DNS_DSDIGEST_SHA384:
60 md_type = ISC_MD_SHA384;
61 break;
62
63 case DNS_DSDIGEST_SHA256:
64 md_type = ISC_MD_SHA256;
65 break;
66
67 default:
68 UNREACHABLE();
69 }
70
71 name = dns_fixedname_initname(&fname);
72 (void)dns_name_downcase(owner, name, NULL);
73
74 md = isc_md_new();
75 if (md == NULL) {
76 return (ISC_R_NOMEMORY);
77 }
78
79 result = isc_md_init(md, md_type);
80 if (result != ISC_R_SUCCESS) {
81 goto end;
82 }
83
84 dns_name_toregion(name, &r);
85
86 result = isc_md_update(md, r.base, r.length);
87 if (result != ISC_R_SUCCESS) {
88 goto end;
89 }
90
91 dns_rdata_toregion(key, &r);
92 INSIST(r.length >= 4);
93
94 result = isc_md_update(md, r.base, r.length);
95 if (result != ISC_R_SUCCESS) {
96 goto end;
97 }
98
99 result = isc_md_final(md, digest, &digestlen);
100 if (result != ISC_R_SUCCESS) {
101 goto end;
102 }
103
104 dsrdata->mctx = NULL;
105 dsrdata->common.rdclass = key->rdclass;
106 dsrdata->common.rdtype = dns_rdatatype_ds;
107 dsrdata->algorithm = r.base[3];
108 dsrdata->key_tag = dst_region_computeid(&r);
109 dsrdata->digest_type = digest_type;
110 dsrdata->digest = digest;
111 dsrdata->length = digestlen;
112
113 end:
114 isc_md_free(md);
115 return (result);
116 }
117
118 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)119 dns_ds_buildrdata(dns_name_t *owner, dns_rdata_t *key,
120 dns_dsdigest_t digest_type, unsigned char *buffer,
121 dns_rdata_t *rdata) {
122 isc_result_t result;
123 unsigned char digest[ISC_MAX_MD_SIZE];
124 dns_rdata_ds_t ds;
125 isc_buffer_t b;
126
127 result = dns_ds_fromkeyrdata(owner, key, digest_type, digest, &ds);
128 if (result != ISC_R_SUCCESS) {
129 return (result);
130 }
131
132 memset(buffer, 0, DNS_DS_BUFFERSIZE);
133 isc_buffer_init(&b, buffer, DNS_DS_BUFFERSIZE);
134 result = dns_rdata_fromstruct(rdata, key->rdclass, dns_rdatatype_ds,
135 &ds, &b);
136 return (result);
137 }
138