Adding upstream version 1:9.18.19.upstream/1%9.18.19upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2831 insertions, 0 deletions

diff --git a/lib/dns/dst_api.c b/lib/dns/dst_api.c
new file mode 100644
index 0000000..f04ae2f
--- /dev/null
+++ b/lib/dns/dst_api.c
@@ -0,0 +1,2831 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0 AND ISC
+ *
+ * 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.
+ */
+
+/*
+ * Copyright (C) Network Associates, Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC AND NETWORK ASSOCIATES DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE
+ * FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*! \file */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <isc/buffer.h>
+#include <isc/dir.h>
+#include <isc/file.h>
+#include <isc/lex.h>
+#include <isc/mem.h>
+#include <isc/once.h>
+#include <isc/os.h>
+#include <isc/print.h>
+#include <isc/random.h>
+#include <isc/refcount.h>
+#include <isc/safe.h>
+#include <isc/string.h>
+#include <isc/time.h>
+#include <isc/util.h>
+
+#define DST_KEY_INTERNAL
+
+#include <isc/result.h>
+
+#include <dns/fixedname.h>
+#include <dns/keyvalues.h>
+#include <dns/name.h>
+#include <dns/rdata.h>
+#include <dns/rdataclass.h>
+#include <dns/ttl.h>
+#include <dns/types.h>
+
+#include "dst_internal.h"
+
+#define DST_AS_STR(t) ((t).value.as_textregion.base)
+
+#define NEXTTOKEN(lex, opt, token)                       \
+	{                                                \
+		ret = isc_lex_gettoken(lex, opt, token); \
+		if (ret != ISC_R_SUCCESS)                \
+			goto cleanup;                    \
+	}
+
+#define NEXTTOKEN_OR_EOF(lex, opt, token)                \
+	do {                                             \
+		ret = isc_lex_gettoken(lex, opt, token); \
+		if (ret == ISC_R_EOF)                    \
+			break;                           \
+		if (ret != ISC_R_SUCCESS)                \
+			goto cleanup;                    \
+	} while ((*token).type == isc_tokentype_eol);
+
+#define READLINE(lex, opt, token)                        \
+	do {                                             \
+		ret = isc_lex_gettoken(lex, opt, token); \
+		if (ret == ISC_R_EOF)                    \
+			break;                           \
+		if (ret != ISC_R_SUCCESS)                \
+			goto cleanup;                    \
+	} while ((*token).type != isc_tokentype_eol)
+
+#define BADTOKEN()                           \
+	{                                    \
+		ret = ISC_R_UNEXPECTEDTOKEN; \
+		goto cleanup;                \
+	}
+
+#define NUMERIC_NTAGS (DST_MAX_NUMERIC + 1)
+static const char *numerictags[NUMERIC_NTAGS] = {
+	"Predecessor:", "Successor:",  "MaxTTL:",    "RollPeriod:",
+	"Lifetime:",	"DSPubCount:", "DSRemCount:"
+};
+
+#define BOOLEAN_NTAGS (DST_MAX_BOOLEAN + 1)
+static const char *booleantags[BOOLEAN_NTAGS] = { "KSK:", "ZSK:" };
+
+#define TIMING_NTAGS (DST_MAX_TIMES + 1)
+static const char *timingtags[TIMING_NTAGS] = {
+	"Generated:",	 "Published:",	  "Active:",	   "Revoked:",
+	"Retired:",	 "Removed:",
+
+	"DSPublish:",	 "SyncPublish:",  "SyncDelete:",
+
+	"DNSKEYChange:", "ZRRSIGChange:", "KRRSIGChange:", "DSChange:",
+
+	"DSRemoved:"
+};
+
+#define KEYSTATES_NTAGS (DST_MAX_KEYSTATES + 1)
+static const char *keystatestags[KEYSTATES_NTAGS] = {
+	"DNSKEYState:", "ZRRSIGState:", "KRRSIGState:", "DSState:", "GoalState:"
+};
+
+#define KEYSTATES_NVALUES 4
+static const char *keystates[KEYSTATES_NVALUES] = {
+	"hidden",
+	"rumoured",
+	"omnipresent",
+	"unretentive",
+};
+
+#define STATE_ALGORITHM_STR "Algorithm:"
+#define STATE_LENGTH_STR    "Length:"
+#define MAX_NTAGS \
+	(DST_MAX_NUMERIC + DST_MAX_BOOLEAN + DST_MAX_TIMES + DST_MAX_KEYSTATES)
+
+static dst_func_t *dst_t_func[DST_MAX_ALGS];
+
+static bool dst_initialized = false;
+
+void
+gss_log(int level, const char *fmt, ...) ISC_FORMAT_PRINTF(2, 3);
+
+/*
+ * Static functions.
+ */
+static dst_key_t *
+get_key_struct(const dns_name_t *name, unsigned int alg, unsigned int flags,
+	       unsigned int protocol, unsigned int bits,
+	       dns_rdataclass_t rdclass, dns_ttl_t ttl, isc_mem_t *mctx);
+static isc_result_t
+write_public_key(const dst_key_t *key, int type, const char *directory);
+static isc_result_t
+write_key_state(const dst_key_t *key, int type, const char *directory);
+static isc_result_t
+buildfilename(dns_name_t *name, dns_keytag_t id, unsigned int alg,
+	      unsigned int type, const char *directory, isc_buffer_t *out);
+static isc_result_t
+computeid(dst_key_t *key);
+static isc_result_t
+frombuffer(const dns_name_t *name, unsigned int alg, unsigned int flags,
+	   unsigned int protocol, dns_rdataclass_t rdclass,
+	   isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp);
+
+static isc_result_t
+algorithm_status(unsigned int alg);
+
+static isc_result_t
+addsuffix(char *filename, int len, const char *dirname, const char *ofilename,
+	  const char *suffix);
+
+#define RETERR(x)                            \
+	do {                                 \
+		result = (x);                \
+		if (result != ISC_R_SUCCESS) \
+			goto out;            \
+	} while (0)
+
+#define CHECKALG(alg)                       \
+	do {                                \
+		isc_result_t _r;            \
+		_r = algorithm_status(alg); \
+		if (_r != ISC_R_SUCCESS)    \
+			return ((_r));      \
+	} while (0);
+
+isc_result_t
+dst_lib_init(isc_mem_t *mctx, const char *engine) {
+	isc_result_t result;
+
+	REQUIRE(mctx != NULL);
+	REQUIRE(!dst_initialized);
+
+	UNUSED(engine);
+
+	memset(dst_t_func, 0, sizeof(dst_t_func));
+	RETERR(dst__hmacmd5_init(&dst_t_func[DST_ALG_HMACMD5]));
+	RETERR(dst__hmacsha1_init(&dst_t_func[DST_ALG_HMACSHA1]));
+	RETERR(dst__hmacsha224_init(&dst_t_func[DST_ALG_HMACSHA224]));
+	RETERR(dst__hmacsha256_init(&dst_t_func[DST_ALG_HMACSHA256]));
+	RETERR(dst__hmacsha384_init(&dst_t_func[DST_ALG_HMACSHA384]));
+	RETERR(dst__hmacsha512_init(&dst_t_func[DST_ALG_HMACSHA512]));
+	RETERR(dst__openssl_init(engine));
+	RETERR(dst__openssldh_init(&dst_t_func[DST_ALG_DH]));
+	RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSASHA1],
+				    DST_ALG_RSASHA1));
+	RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_NSEC3RSASHA1],
+				    DST_ALG_NSEC3RSASHA1));
+	RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSASHA256],
+				    DST_ALG_RSASHA256));
+	RETERR(dst__opensslrsa_init(&dst_t_func[DST_ALG_RSASHA512],
+				    DST_ALG_RSASHA512));
+	RETERR(dst__opensslecdsa_init(&dst_t_func[DST_ALG_ECDSA256]));
+	RETERR(dst__opensslecdsa_init(&dst_t_func[DST_ALG_ECDSA384]));
+#ifdef HAVE_OPENSSL_ED25519
+	RETERR(dst__openssleddsa_init(&dst_t_func[DST_ALG_ED25519]));
+#endif /* ifdef HAVE_OPENSSL_ED25519 */
+#ifdef HAVE_OPENSSL_ED448
+	RETERR(dst__openssleddsa_init(&dst_t_func[DST_ALG_ED448]));
+#endif /* ifdef HAVE_OPENSSL_ED448 */
+
+#if HAVE_GSSAPI
+	RETERR(dst__gssapi_init(&dst_t_func[DST_ALG_GSSAPI]));
+#endif /* HAVE_GSSAPI */
+
+	dst_initialized = true;
+	return (ISC_R_SUCCESS);
+
+out:
+	/* avoid immediate crash! */
+	dst_initialized = true;
+	dst_lib_destroy();
+	return (result);
+}
+
+void
+dst_lib_destroy(void) {
+	int i;
+	RUNTIME_CHECK(dst_initialized);
+	dst_initialized = false;
+
+	for (i = 0; i < DST_MAX_ALGS; i++) {
+		if (dst_t_func[i] != NULL && dst_t_func[i]->cleanup != NULL) {
+			dst_t_func[i]->cleanup();
+		}
+	}
+	dst__openssl_destroy();
+}
+
+bool
+dst_algorithm_supported(unsigned int alg) {
+	REQUIRE(dst_initialized);
+
+	if (alg >= DST_MAX_ALGS || dst_t_func[alg] == NULL) {
+		return (false);
+	}
+	return (true);
+}
+
+bool
+dst_ds_digest_supported(unsigned int digest_type) {
+	return (digest_type == DNS_DSDIGEST_SHA1 ||
+		digest_type == DNS_DSDIGEST_SHA256 ||
+		digest_type == DNS_DSDIGEST_SHA384);
+}
+
+isc_result_t
+dst_context_create(dst_key_t *key, isc_mem_t *mctx, isc_logcategory_t *category,
+		   bool useforsigning, int maxbits, dst_context_t **dctxp) {
+	dst_context_t *dctx;
+	isc_result_t result;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(mctx != NULL);
+	REQUIRE(dctxp != NULL && *dctxp == NULL);
+
+	if (key->func->createctx == NULL && key->func->createctx2 == NULL) {
+		return (DST_R_UNSUPPORTEDALG);
+	}
+	if (key->keydata.generic == NULL) {
+		return (DST_R_NULLKEY);
+	}
+
+	dctx = isc_mem_get(mctx, sizeof(dst_context_t));
+	memset(dctx, 0, sizeof(*dctx));
+	dst_key_attach(key, &dctx->key);
+	isc_mem_attach(mctx, &dctx->mctx);
+	dctx->category = category;
+	if (useforsigning) {
+		dctx->use = DO_SIGN;
+	} else {
+		dctx->use = DO_VERIFY;
+	}
+	if (key->func->createctx2 != NULL) {
+		result = key->func->createctx2(key, maxbits, dctx);
+	} else {
+		result = key->func->createctx(key, dctx);
+	}
+	if (result != ISC_R_SUCCESS) {
+		if (dctx->key != NULL) {
+			dst_key_free(&dctx->key);
+		}
+		isc_mem_putanddetach(&dctx->mctx, dctx, sizeof(dst_context_t));
+		return (result);
+	}
+	dctx->magic = CTX_MAGIC;
+	*dctxp = dctx;
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_context_destroy(dst_context_t **dctxp) {
+	dst_context_t *dctx;
+
+	REQUIRE(dctxp != NULL && VALID_CTX(*dctxp));
+
+	dctx = *dctxp;
+	*dctxp = NULL;
+	INSIST(dctx->key->func->destroyctx != NULL);
+	dctx->key->func->destroyctx(dctx);
+	if (dctx->key != NULL) {
+		dst_key_free(&dctx->key);
+	}
+	dctx->magic = 0;
+	isc_mem_putanddetach(&dctx->mctx, dctx, sizeof(dst_context_t));
+}
+
+isc_result_t
+dst_context_adddata(dst_context_t *dctx, const isc_region_t *data) {
+	REQUIRE(VALID_CTX(dctx));
+	REQUIRE(data != NULL);
+	INSIST(dctx->key->func->adddata != NULL);
+
+	return (dctx->key->func->adddata(dctx, data));
+}
+
+isc_result_t
+dst_context_sign(dst_context_t *dctx, isc_buffer_t *sig) {
+	dst_key_t *key;
+
+	REQUIRE(VALID_CTX(dctx));
+	REQUIRE(sig != NULL);
+
+	key = dctx->key;
+	CHECKALG(key->key_alg);
+	if (key->keydata.generic == NULL) {
+		return (DST_R_NULLKEY);
+	}
+
+	if (key->func->sign == NULL) {
+		return (DST_R_NOTPRIVATEKEY);
+	}
+	if (key->func->isprivate == NULL || !key->func->isprivate(key)) {
+		return (DST_R_NOTPRIVATEKEY);
+	}
+
+	return (key->func->sign(dctx, sig));
+}
+
+isc_result_t
+dst_context_verify(dst_context_t *dctx, isc_region_t *sig) {
+	REQUIRE(VALID_CTX(dctx));
+	REQUIRE(sig != NULL);
+
+	CHECKALG(dctx->key->key_alg);
+	if (dctx->key->keydata.generic == NULL) {
+		return (DST_R_NULLKEY);
+	}
+	if (dctx->key->func->verify == NULL) {
+		return (DST_R_NOTPUBLICKEY);
+	}
+
+	return (dctx->key->func->verify(dctx, sig));
+}
+
+isc_result_t
+dst_context_verify2(dst_context_t *dctx, unsigned int maxbits,
+		    isc_region_t *sig) {
+	REQUIRE(VALID_CTX(dctx));
+	REQUIRE(sig != NULL);
+
+	CHECKALG(dctx->key->key_alg);
+	if (dctx->key->keydata.generic == NULL) {
+		return (DST_R_NULLKEY);
+	}
+	if (dctx->key->func->verify == NULL && dctx->key->func->verify2 == NULL)
+	{
+		return (DST_R_NOTPUBLICKEY);
+	}
+
+	return (dctx->key->func->verify2 != NULL
+			? dctx->key->func->verify2(dctx, maxbits, sig)
+			: dctx->key->func->verify(dctx, sig));
+}
+
+isc_result_t
+dst_key_computesecret(const dst_key_t *pub, const dst_key_t *priv,
+		      isc_buffer_t *secret) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(pub) && VALID_KEY(priv));
+	REQUIRE(secret != NULL);
+
+	CHECKALG(pub->key_alg);
+	CHECKALG(priv->key_alg);
+
+	if (pub->keydata.generic == NULL || priv->keydata.generic == NULL) {
+		return (DST_R_NULLKEY);
+	}
+
+	if (pub->key_alg != priv->key_alg || pub->func->computesecret == NULL ||
+	    priv->func->computesecret == NULL)
+	{
+		return (DST_R_KEYCANNOTCOMPUTESECRET);
+	}
+
+	if (!dst_key_isprivate(priv)) {
+		return (DST_R_NOTPRIVATEKEY);
+	}
+
+	return (pub->func->computesecret(pub, priv, secret));
+}
+
+isc_result_t
+dst_key_tofile(const dst_key_t *key, int type, const char *directory) {
+	isc_result_t ret = ISC_R_SUCCESS;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE((type &
+		 (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC | DST_TYPE_STATE)) != 0);
+
+	CHECKALG(key->key_alg);
+
+	if (key->func->tofile == NULL) {
+		return (DST_R_UNSUPPORTEDALG);
+	}
+
+	if ((type & DST_TYPE_PUBLIC) != 0) {
+		ret = write_public_key(key, type, directory);
+		if (ret != ISC_R_SUCCESS) {
+			return (ret);
+		}
+	}
+
+	if ((type & DST_TYPE_STATE) != 0) {
+		ret = write_key_state(key, type, directory);
+		if (ret != ISC_R_SUCCESS) {
+			return (ret);
+		}
+	}
+
+	if (((type & DST_TYPE_PRIVATE) != 0) &&
+	    (key->key_flags & DNS_KEYFLAG_TYPEMASK) != DNS_KEYTYPE_NOKEY)
+	{
+		return (key->func->tofile(key, directory));
+	}
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_key_setexternal(dst_key_t *key, bool value) {
+	REQUIRE(VALID_KEY(key));
+
+	key->external = value;
+}
+
+bool
+dst_key_isexternal(dst_key_t *key) {
+	REQUIRE(VALID_KEY(key));
+
+	return (key->external);
+}
+
+void
+dst_key_setmodified(dst_key_t *key, bool value) {
+	REQUIRE(VALID_KEY(key));
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = value;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+bool
+dst_key_ismodified(const dst_key_t *key) {
+	bool modified;
+
+	REQUIRE(VALID_KEY(key));
+
+	isc_mutex_lock(&(((dst_key_t *)key)->mdlock));
+	modified = key->modified;
+	isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+
+	return (modified);
+}
+
+isc_result_t
+dst_key_getfilename(dns_name_t *name, dns_keytag_t id, unsigned int alg,
+		    int type, const char *directory, isc_mem_t *mctx,
+		    isc_buffer_t *buf) {
+	isc_result_t result;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(dns_name_isabsolute(name));
+	REQUIRE((type &
+		 (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC | DST_TYPE_STATE)) != 0);
+	REQUIRE(mctx != NULL);
+	REQUIRE(buf != NULL);
+
+	CHECKALG(alg);
+
+	result = buildfilename(name, id, alg, type, directory, buf);
+	if (result == ISC_R_SUCCESS) {
+		if (isc_buffer_availablelength(buf) > 0) {
+			isc_buffer_putuint8(buf, 0);
+		} else {
+			result = ISC_R_NOSPACE;
+		}
+	}
+
+	return (result);
+}
+
+isc_result_t
+dst_key_fromfile(dns_name_t *name, dns_keytag_t id, unsigned int alg, int type,
+		 const char *directory, isc_mem_t *mctx, dst_key_t **keyp) {
+	isc_result_t result;
+	char filename[NAME_MAX];
+	isc_buffer_t buf;
+	dst_key_t *key;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(dns_name_isabsolute(name));
+	REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0);
+	REQUIRE(mctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+
+	CHECKALG(alg);
+
+	key = NULL;
+
+	isc_buffer_init(&buf, filename, NAME_MAX);
+	result = dst_key_getfilename(name, id, alg, type, NULL, mctx, &buf);
+	if (result != ISC_R_SUCCESS) {
+		goto out;
+	}
+
+	result = dst_key_fromnamedfile(filename, directory, type, mctx, &key);
+	if (result != ISC_R_SUCCESS) {
+		goto out;
+	}
+
+	result = computeid(key);
+	if (result != ISC_R_SUCCESS) {
+		goto out;
+	}
+
+	if (!dns_name_equal(name, key->key_name) || id != key->key_id ||
+	    alg != key->key_alg)
+	{
+		result = DST_R_INVALIDPRIVATEKEY;
+		goto out;
+	}
+
+	*keyp = key;
+	result = ISC_R_SUCCESS;
+
+out:
+	if ((key != NULL) && (result != ISC_R_SUCCESS)) {
+		dst_key_free(&key);
+	}
+
+	return (result);
+}
+
+isc_result_t
+dst_key_fromnamedfile(const char *filename, const char *dirname, int type,
+		      isc_mem_t *mctx, dst_key_t **keyp) {
+	isc_result_t result;
+	dst_key_t *pubkey = NULL, *key = NULL;
+	char *newfilename = NULL, *statefilename = NULL;
+	int newfilenamelen = 0, statefilenamelen = 0;
+	isc_lex_t *lex = NULL;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(filename != NULL);
+	REQUIRE((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) != 0);
+	REQUIRE(mctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+
+	/* If an absolute path is specified, don't use the key directory */
+	if (filename[0] == '/') {
+		dirname = NULL;
+	}
+
+	newfilenamelen = strlen(filename) + 5;
+	if (dirname != NULL) {
+		newfilenamelen += strlen(dirname) + 1;
+	}
+	newfilename = isc_mem_get(mctx, newfilenamelen);
+	result = addsuffix(newfilename, newfilenamelen, dirname, filename,
+			   ".key");
+	INSIST(result == ISC_R_SUCCESS);
+
+	RETERR(dst_key_read_public(newfilename, type, mctx, &pubkey));
+	isc_mem_put(mctx, newfilename, newfilenamelen);
+
+	/*
+	 * Read the state file, if requested by type.
+	 */
+	if ((type & DST_TYPE_STATE) != 0) {
+		statefilenamelen = strlen(filename) + 7;
+		if (dirname != NULL) {
+			statefilenamelen += strlen(dirname) + 1;
+		}
+		statefilename = isc_mem_get(mctx, statefilenamelen);
+		result = addsuffix(statefilename, statefilenamelen, dirname,
+				   filename, ".state");
+		INSIST(result == ISC_R_SUCCESS);
+	}
+
+	pubkey->kasp = false;
+	if ((type & DST_TYPE_STATE) != 0) {
+		result = dst_key_read_state(statefilename, mctx, &pubkey);
+		if (result == ISC_R_SUCCESS) {
+			pubkey->kasp = true;
+		} else if (result == ISC_R_FILENOTFOUND) {
+			/* Having no state is valid. */
+			result = ISC_R_SUCCESS;
+		}
+		RETERR(result);
+	}
+
+	if ((type & (DST_TYPE_PRIVATE | DST_TYPE_PUBLIC)) == DST_TYPE_PUBLIC ||
+	    (pubkey->key_flags & DNS_KEYFLAG_TYPEMASK) == DNS_KEYTYPE_NOKEY)
+	{
+		RETERR(computeid(pubkey));
+		pubkey->modified = false;
+		*keyp = pubkey;
+		pubkey = NULL;
+		goto out;
+	}
+
+	RETERR(algorithm_status(pubkey->key_alg));
+
+	key = get_key_struct(pubkey->key_name, pubkey->key_alg,
+			     pubkey->key_flags, pubkey->key_proto,
+			     pubkey->key_size, pubkey->key_class,
+			     pubkey->key_ttl, mctx);
+	if (key == NULL) {
+		RETERR(ISC_R_NOMEMORY);
+	}
+
+	if (key->func->parse == NULL) {
+		RETERR(DST_R_UNSUPPORTEDALG);
+	}
+
+	newfilenamelen = strlen(filename) + 9;
+	if (dirname != NULL) {
+		newfilenamelen += strlen(dirname) + 1;
+	}
+	newfilename = isc_mem_get(mctx, newfilenamelen);
+	result = addsuffix(newfilename, newfilenamelen, dirname, filename,
+			   ".private");
+	INSIST(result == ISC_R_SUCCESS);
+
+	RETERR(isc_lex_create(mctx, 1500, &lex));
+	RETERR(isc_lex_openfile(lex, newfilename));
+	isc_mem_put(mctx, newfilename, newfilenamelen);
+
+	RETERR(key->func->parse(key, lex, pubkey));
+	isc_lex_destroy(&lex);
+
+	key->kasp = false;
+	if ((type & DST_TYPE_STATE) != 0) {
+		result = dst_key_read_state(statefilename, mctx, &key);
+		if (result == ISC_R_SUCCESS) {
+			key->kasp = true;
+		} else if (result == ISC_R_FILENOTFOUND) {
+			/* Having no state is valid. */
+			result = ISC_R_SUCCESS;
+		}
+		RETERR(result);
+	}
+
+	RETERR(computeid(key));
+
+	if (pubkey->key_id != key->key_id) {
+		RETERR(DST_R_INVALIDPRIVATEKEY);
+	}
+
+	key->modified = false;
+	*keyp = key;
+	key = NULL;
+
+out:
+	if (pubkey != NULL) {
+		dst_key_free(&pubkey);
+	}
+	if (newfilename != NULL) {
+		isc_mem_put(mctx, newfilename, newfilenamelen);
+	}
+	if (statefilename != NULL) {
+		isc_mem_put(mctx, statefilename, statefilenamelen);
+	}
+	if (lex != NULL) {
+		isc_lex_destroy(&lex);
+	}
+	if (key != NULL) {
+		dst_key_free(&key);
+	}
+	return (result);
+}
+
+isc_result_t
+dst_key_todns(const dst_key_t *key, isc_buffer_t *target) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(target != NULL);
+
+	CHECKALG(key->key_alg);
+
+	if (key->func->todns == NULL) {
+		return (DST_R_UNSUPPORTEDALG);
+	}
+
+	if (isc_buffer_availablelength(target) < 4) {
+		return (ISC_R_NOSPACE);
+	}
+	isc_buffer_putuint16(target, (uint16_t)(key->key_flags & 0xffff));
+	isc_buffer_putuint8(target, (uint8_t)key->key_proto);
+	isc_buffer_putuint8(target, (uint8_t)key->key_alg);
+
+	if ((key->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
+		if (isc_buffer_availablelength(target) < 2) {
+			return (ISC_R_NOSPACE);
+		}
+		isc_buffer_putuint16(
+			target, (uint16_t)((key->key_flags >> 16) & 0xffff));
+	}
+
+	if (key->keydata.generic == NULL) { /*%< NULL KEY */
+		return (ISC_R_SUCCESS);
+	}
+
+	return (key->func->todns(key, target));
+}
+
+isc_result_t
+dst_key_fromdns(const dns_name_t *name, dns_rdataclass_t rdclass,
+		isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp) {
+	uint8_t alg, proto;
+	uint32_t flags, extflags;
+	dst_key_t *key = NULL;
+	dns_keytag_t id, rid;
+	isc_region_t r;
+	isc_result_t result;
+
+	REQUIRE(dst_initialized);
+
+	isc_buffer_remainingregion(source, &r);
+
+	if (isc_buffer_remaininglength(source) < 4) {
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	flags = isc_buffer_getuint16(source);
+	proto = isc_buffer_getuint8(source);
+	alg = isc_buffer_getuint8(source);
+
+	id = dst_region_computeid(&r);
+	rid = dst_region_computerid(&r);
+
+	if ((flags & DNS_KEYFLAG_EXTENDED) != 0) {
+		if (isc_buffer_remaininglength(source) < 2) {
+			return (DST_R_INVALIDPUBLICKEY);
+		}
+		extflags = isc_buffer_getuint16(source);
+		flags |= (extflags << 16);
+	}
+
+	result = frombuffer(name, alg, flags, proto, rdclass, source, mctx,
+			    &key);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+	key->key_id = id;
+	key->key_rid = rid;
+
+	*keyp = key;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_frombuffer(const dns_name_t *name, unsigned int alg, unsigned int flags,
+		   unsigned int protocol, dns_rdataclass_t rdclass,
+		   isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp) {
+	dst_key_t *key = NULL;
+	isc_result_t result;
+
+	REQUIRE(dst_initialized);
+
+	result = frombuffer(name, alg, flags, protocol, rdclass, source, mctx,
+			    &key);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	result = computeid(key);
+	if (result != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+		return (result);
+	}
+
+	*keyp = key;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_tobuffer(const dst_key_t *key, isc_buffer_t *target) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(target != NULL);
+
+	CHECKALG(key->key_alg);
+
+	if (key->func->todns == NULL) {
+		return (DST_R_UNSUPPORTEDALG);
+	}
+
+	return (key->func->todns(key, target));
+}
+
+isc_result_t
+dst_key_privatefrombuffer(dst_key_t *key, isc_buffer_t *buffer) {
+	isc_lex_t *lex = NULL;
+	isc_result_t result = ISC_R_SUCCESS;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(!dst_key_isprivate(key));
+	REQUIRE(buffer != NULL);
+
+	if (key->func->parse == NULL) {
+		RETERR(DST_R_UNSUPPORTEDALG);
+	}
+
+	RETERR(isc_lex_create(key->mctx, 1500, &lex));
+	RETERR(isc_lex_openbuffer(lex, buffer));
+	RETERR(key->func->parse(key, lex, NULL));
+out:
+	if (lex != NULL) {
+		isc_lex_destroy(&lex);
+	}
+	return (result);
+}
+
+dns_gss_ctx_id_t
+dst_key_getgssctx(const dst_key_t *key) {
+	REQUIRE(key != NULL);
+
+	return (key->keydata.gssctx);
+}
+
+isc_result_t
+dst_key_fromgssapi(const dns_name_t *name, dns_gss_ctx_id_t gssctx,
+		   isc_mem_t *mctx, dst_key_t **keyp, isc_region_t *intoken) {
+	dst_key_t *key;
+	isc_result_t result;
+
+	REQUIRE(gssctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+
+	key = get_key_struct(name, DST_ALG_GSSAPI, 0, DNS_KEYPROTO_DNSSEC, 0,
+			     dns_rdataclass_in, 0, mctx);
+	if (key == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	if (intoken != NULL) {
+		/*
+		 * Keep the token for use by external ssu rules. They may need
+		 * to examine the PAC in the kerberos ticket.
+		 */
+		isc_buffer_allocate(key->mctx, &key->key_tkeytoken,
+				    intoken->length);
+		RETERR(isc_buffer_copyregion(key->key_tkeytoken, intoken));
+	}
+
+	key->keydata.gssctx = gssctx;
+	*keyp = key;
+	result = ISC_R_SUCCESS;
+out:
+	if (result != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+	}
+	return (result);
+}
+
+FILE *
+dst_key_open(char *tmpname, mode_t mode) {
+	/* Create public key file. */
+	int fd = mkstemp(tmpname);
+	if (fd == -1) {
+		return (NULL);
+	}
+
+	if (fchmod(fd, mode & ~isc_os_umask()) != 0) {
+		goto error;
+	}
+
+	FILE *fp = fdopen(fd, "w");
+	if (fp == NULL) {
+		goto error;
+	}
+
+	return (fp);
+error:
+	(void)close(fd);
+	(void)unlink(tmpname);
+	return (NULL);
+}
+
+isc_result_t
+dst_key_close(char *tmpname, FILE *fp, char *filename) {
+	if ((fflush(fp) != 0) || (ferror(fp) != 0)) {
+		return (dst_key_cleanup(tmpname, fp));
+	}
+
+	if (rename(tmpname, filename) != 0) {
+		return (dst_key_cleanup(tmpname, fp));
+	}
+
+	if (fclose(fp) != 0) {
+		/*
+		 * This is in fact error, but we don't care at this point,
+		 * as the file has been already flushed to disk.
+		 */
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_cleanup(char *tmpname, FILE *fp) {
+	if (ftruncate(fileno(fp), 0) != 0) {
+		/*
+		 * ftruncate() result can't be ignored, but we don't care, as
+		 * any sensitive data are protected by the permissions, and
+		 * unlinked in the next step, this is just a good practice.
+		 */
+	}
+
+	(void)unlink(tmpname);
+	(void)fclose(fp);
+
+	return (DST_R_WRITEERROR);
+}
+
+isc_result_t
+dst_key_buildinternal(const dns_name_t *name, unsigned int alg,
+		      unsigned int bits, unsigned int flags,
+		      unsigned int protocol, dns_rdataclass_t rdclass,
+		      void *data, isc_mem_t *mctx, dst_key_t **keyp) {
+	dst_key_t *key;
+	isc_result_t result;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(dns_name_isabsolute(name));
+	REQUIRE(mctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+	REQUIRE(data != NULL);
+
+	CHECKALG(alg);
+
+	key = get_key_struct(name, alg, flags, protocol, bits, rdclass, 0,
+			     mctx);
+	if (key == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	key->keydata.generic = data;
+
+	result = computeid(key);
+	if (result != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+		return (result);
+	}
+
+	*keyp = key;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_fromlabel(const dns_name_t *name, int alg, unsigned int flags,
+		  unsigned int protocol, dns_rdataclass_t rdclass,
+		  const char *engine, const char *label, const char *pin,
+		  isc_mem_t *mctx, dst_key_t **keyp) {
+	dst_key_t *key;
+	isc_result_t result;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(dns_name_isabsolute(name));
+	REQUIRE(mctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+	REQUIRE(label != NULL);
+
+	CHECKALG(alg);
+
+	key = get_key_struct(name, alg, flags, protocol, 0, rdclass, 0, mctx);
+	if (key == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	if (key->func->fromlabel == NULL) {
+		dst_key_free(&key);
+		return (DST_R_UNSUPPORTEDALG);
+	}
+
+	result = key->func->fromlabel(key, engine, label, pin);
+	if (result != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+		return (result);
+	}
+
+	result = computeid(key);
+	if (result != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+		return (result);
+	}
+
+	*keyp = key;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_generate(const dns_name_t *name, unsigned int alg, unsigned int bits,
+		 unsigned int param, unsigned int flags, unsigned int protocol,
+		 dns_rdataclass_t rdclass, isc_mem_t *mctx, dst_key_t **keyp,
+		 void (*callback)(int)) {
+	dst_key_t *key;
+	isc_result_t ret;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(dns_name_isabsolute(name));
+	REQUIRE(mctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+
+	CHECKALG(alg);
+
+	key = get_key_struct(name, alg, flags, protocol, bits, rdclass, 0,
+			     mctx);
+	if (key == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	if (bits == 0) { /*%< NULL KEY */
+		key->key_flags |= DNS_KEYTYPE_NOKEY;
+		*keyp = key;
+		return (ISC_R_SUCCESS);
+	}
+
+	if (key->func->generate == NULL) {
+		dst_key_free(&key);
+		return (DST_R_UNSUPPORTEDALG);
+	}
+
+	ret = key->func->generate(key, param, callback);
+	if (ret != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+		return (ret);
+	}
+
+	ret = computeid(key);
+	if (ret != ISC_R_SUCCESS) {
+		dst_key_free(&key);
+		return (ret);
+	}
+
+	*keyp = key;
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_getbool(const dst_key_t *key, int type, bool *valuep) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(valuep != NULL);
+	REQUIRE(type <= DST_MAX_BOOLEAN);
+
+	isc_mutex_lock(&(((dst_key_t *)key)->mdlock));
+	if (!key->boolset[type]) {
+		isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+		return (ISC_R_NOTFOUND);
+	}
+	*valuep = key->bools[type];
+	isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_key_setbool(dst_key_t *key, int type, bool value) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_BOOLEAN);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || !key->boolset[type] ||
+			key->bools[type] != value;
+	key->bools[type] = value;
+	key->boolset[type] = true;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+void
+dst_key_unsetbool(dst_key_t *key, int type) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_BOOLEAN);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || key->boolset[type];
+	key->boolset[type] = false;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+isc_result_t
+dst_key_getnum(const dst_key_t *key, int type, uint32_t *valuep) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(valuep != NULL);
+	REQUIRE(type <= DST_MAX_NUMERIC);
+
+	isc_mutex_lock(&(((dst_key_t *)key)->mdlock));
+	if (!key->numset[type]) {
+		isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+		return (ISC_R_NOTFOUND);
+	}
+	*valuep = key->nums[type];
+	isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_key_setnum(dst_key_t *key, int type, uint32_t value) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_NUMERIC);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || !key->numset[type] ||
+			key->nums[type] != value;
+	key->nums[type] = value;
+	key->numset[type] = true;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+void
+dst_key_unsetnum(dst_key_t *key, int type) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_NUMERIC);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || key->numset[type];
+	key->numset[type] = false;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+isc_result_t
+dst_key_gettime(const dst_key_t *key, int type, isc_stdtime_t *timep) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(timep != NULL);
+	REQUIRE(type <= DST_MAX_TIMES);
+
+	isc_mutex_lock(&(((dst_key_t *)key)->mdlock));
+	if (!key->timeset[type]) {
+		isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+		return (ISC_R_NOTFOUND);
+	}
+	*timep = key->times[type];
+	isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_key_settime(dst_key_t *key, int type, isc_stdtime_t when) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_TIMES);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || !key->timeset[type] ||
+			key->times[type] != when;
+	key->times[type] = when;
+	key->timeset[type] = true;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+void
+dst_key_unsettime(dst_key_t *key, int type) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_TIMES);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || key->timeset[type];
+	key->timeset[type] = false;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+isc_result_t
+dst_key_getstate(const dst_key_t *key, int type, dst_key_state_t *statep) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(statep != NULL);
+	REQUIRE(type <= DST_MAX_KEYSTATES);
+
+	isc_mutex_lock(&(((dst_key_t *)key)->mdlock));
+	if (!key->keystateset[type]) {
+		isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+		return (ISC_R_NOTFOUND);
+	}
+	*statep = key->keystates[type];
+	isc_mutex_unlock(&(((dst_key_t *)key)->mdlock));
+
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_key_setstate(dst_key_t *key, int type, dst_key_state_t state) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_KEYSTATES);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || !key->keystateset[type] ||
+			key->keystates[type] != state;
+	key->keystates[type] = state;
+	key->keystateset[type] = true;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+void
+dst_key_unsetstate(dst_key_t *key, int type) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type <= DST_MAX_KEYSTATES);
+
+	isc_mutex_lock(&key->mdlock);
+	key->modified = key->modified || key->keystateset[type];
+	key->keystateset[type] = false;
+	isc_mutex_unlock(&key->mdlock);
+}
+
+isc_result_t
+dst_key_getprivateformat(const dst_key_t *key, int *majorp, int *minorp) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(majorp != NULL);
+	REQUIRE(minorp != NULL);
+	*majorp = key->fmt_major;
+	*minorp = key->fmt_minor;
+	return (ISC_R_SUCCESS);
+}
+
+void
+dst_key_setprivateformat(dst_key_t *key, int major, int minor) {
+	REQUIRE(VALID_KEY(key));
+	key->fmt_major = major;
+	key->fmt_minor = minor;
+}
+
+static bool
+comparekeys(const dst_key_t *key1, const dst_key_t *key2,
+	    bool match_revoked_key,
+	    bool (*compare)(const dst_key_t *key1, const dst_key_t *key2)) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key1));
+	REQUIRE(VALID_KEY(key2));
+
+	if (key1 == key2) {
+		return (true);
+	}
+
+	if (key1->key_alg != key2->key_alg) {
+		return (false);
+	}
+
+	if (key1->key_id != key2->key_id) {
+		if (!match_revoked_key) {
+			return (false);
+		}
+		if ((key1->key_flags & DNS_KEYFLAG_REVOKE) ==
+		    (key2->key_flags & DNS_KEYFLAG_REVOKE))
+		{
+			return (false);
+		}
+		if (key1->key_id != key2->key_rid &&
+		    key1->key_rid != key2->key_id)
+		{
+			return (false);
+		}
+	}
+
+	if (compare != NULL) {
+		return (compare(key1, key2));
+	} else {
+		return (false);
+	}
+}
+
+/*
+ * Compares only the public portion of two keys, by converting them
+ * both to wire format and comparing the results.
+ */
+static bool
+pub_compare(const dst_key_t *key1, const dst_key_t *key2) {
+	isc_result_t result;
+	unsigned char buf1[DST_KEY_MAXSIZE], buf2[DST_KEY_MAXSIZE];
+	isc_buffer_t b1, b2;
+	isc_region_t r1, r2;
+
+	isc_buffer_init(&b1, buf1, sizeof(buf1));
+	result = dst_key_todns(key1, &b1);
+	if (result != ISC_R_SUCCESS) {
+		return (false);
+	}
+	/* Zero out flags. */
+	buf1[0] = buf1[1] = 0;
+	if ((key1->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
+		isc_buffer_subtract(&b1, 2);
+	}
+
+	isc_buffer_init(&b2, buf2, sizeof(buf2));
+	result = dst_key_todns(key2, &b2);
+	if (result != ISC_R_SUCCESS) {
+		return (false);
+	}
+	/* Zero out flags. */
+	buf2[0] = buf2[1] = 0;
+	if ((key2->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
+		isc_buffer_subtract(&b2, 2);
+	}
+
+	isc_buffer_usedregion(&b1, &r1);
+	/* Remove extended flags. */
+	if ((key1->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
+		memmove(&buf1[4], &buf1[6], r1.length - 6);
+		r1.length -= 2;
+	}
+
+	isc_buffer_usedregion(&b2, &r2);
+	/* Remove extended flags. */
+	if ((key2->key_flags & DNS_KEYFLAG_EXTENDED) != 0) {
+		memmove(&buf2[4], &buf2[6], r2.length - 6);
+		r2.length -= 2;
+	}
+	return (isc_region_compare(&r1, &r2) == 0);
+}
+
+bool
+dst_key_compare(const dst_key_t *key1, const dst_key_t *key2) {
+	return (comparekeys(key1, key2, false, key1->func->compare));
+}
+
+bool
+dst_key_pubcompare(const dst_key_t *key1, const dst_key_t *key2,
+		   bool match_revoked_key) {
+	return (comparekeys(key1, key2, match_revoked_key, pub_compare));
+}
+
+bool
+dst_key_paramcompare(const dst_key_t *key1, const dst_key_t *key2) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key1));
+	REQUIRE(VALID_KEY(key2));
+
+	if (key1 == key2) {
+		return (true);
+	}
+	if (key1->key_alg == key2->key_alg &&
+	    key1->func->paramcompare != NULL &&
+	    key1->func->paramcompare(key1, key2))
+	{
+		return (true);
+	} else {
+		return (false);
+	}
+}
+
+void
+dst_key_attach(dst_key_t *source, dst_key_t **target) {
+	REQUIRE(dst_initialized);
+	REQUIRE(target != NULL && *target == NULL);
+	REQUIRE(VALID_KEY(source));
+
+	isc_refcount_increment(&source->refs);
+	*target = source;
+}
+
+void
+dst_key_free(dst_key_t **keyp) {
+	REQUIRE(dst_initialized);
+	REQUIRE(keyp != NULL && VALID_KEY(*keyp));
+	dst_key_t *key = *keyp;
+	*keyp = NULL;
+
+	if (isc_refcount_decrement(&key->refs) == 1) {
+		isc_refcount_destroy(&key->refs);
+		isc_mem_t *mctx = key->mctx;
+		if (key->keydata.generic != NULL) {
+			INSIST(key->func->destroy != NULL);
+			key->func->destroy(key);
+		}
+		if (key->engine != NULL) {
+			isc_mem_free(mctx, key->engine);
+		}
+		if (key->label != NULL) {
+			isc_mem_free(mctx, key->label);
+		}
+		dns_name_free(key->key_name, mctx);
+		isc_mem_put(mctx, key->key_name, sizeof(dns_name_t));
+		if (key->key_tkeytoken) {
+			isc_buffer_free(&key->key_tkeytoken);
+		}
+		isc_mutex_destroy(&key->mdlock);
+		isc_safe_memwipe(key, sizeof(*key));
+		isc_mem_putanddetach(&mctx, key, sizeof(*key));
+	}
+}
+
+bool
+dst_key_isprivate(const dst_key_t *key) {
+	REQUIRE(VALID_KEY(key));
+	INSIST(key->func->isprivate != NULL);
+	return (key->func->isprivate(key));
+}
+
+isc_result_t
+dst_key_buildfilename(const dst_key_t *key, int type, const char *directory,
+		      isc_buffer_t *out) {
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(type == DST_TYPE_PRIVATE || type == DST_TYPE_PUBLIC ||
+		type == DST_TYPE_STATE || type == DST_TYPE_TEMPLATE ||
+		type == 0);
+
+	return (buildfilename(key->key_name, key->key_id, key->key_alg, type,
+			      directory, out));
+}
+
+isc_result_t
+dst_key_sigsize(const dst_key_t *key, unsigned int *n) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(n != NULL);
+
+	/* XXXVIX this switch statement is too sparse to gen a jump table. */
+	switch (key->key_alg) {
+	case DST_ALG_RSASHA1:
+	case DST_ALG_NSEC3RSASHA1:
+	case DST_ALG_RSASHA256:
+	case DST_ALG_RSASHA512:
+		*n = (key->key_size + 7) / 8;
+		break;
+	case DST_ALG_ECDSA256:
+		*n = DNS_SIG_ECDSA256SIZE;
+		break;
+	case DST_ALG_ECDSA384:
+		*n = DNS_SIG_ECDSA384SIZE;
+		break;
+	case DST_ALG_ED25519:
+		*n = DNS_SIG_ED25519SIZE;
+		break;
+	case DST_ALG_ED448:
+		*n = DNS_SIG_ED448SIZE;
+		break;
+	case DST_ALG_HMACMD5:
+		*n = isc_md_type_get_size(ISC_MD_MD5);
+		break;
+	case DST_ALG_HMACSHA1:
+		*n = isc_md_type_get_size(ISC_MD_SHA1);
+		break;
+	case DST_ALG_HMACSHA224:
+		*n = isc_md_type_get_size(ISC_MD_SHA224);
+		break;
+	case DST_ALG_HMACSHA256:
+		*n = isc_md_type_get_size(ISC_MD_SHA256);
+		break;
+	case DST_ALG_HMACSHA384:
+		*n = isc_md_type_get_size(ISC_MD_SHA384);
+		break;
+	case DST_ALG_HMACSHA512:
+		*n = isc_md_type_get_size(ISC_MD_SHA512);
+		break;
+	case DST_ALG_GSSAPI:
+		*n = 128; /*%< XXX */
+		break;
+	case DST_ALG_DH:
+	default:
+		return (DST_R_UNSUPPORTEDALG);
+	}
+	return (ISC_R_SUCCESS);
+}
+
+isc_result_t
+dst_key_secretsize(const dst_key_t *key, unsigned int *n) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+	REQUIRE(n != NULL);
+
+	if (key->key_alg == DST_ALG_DH) {
+		*n = (key->key_size + 7) / 8;
+		return (ISC_R_SUCCESS);
+	}
+	return (DST_R_UNSUPPORTEDALG);
+}
+
+/*%
+ * Set the flags on a key, then recompute the key ID
+ */
+isc_result_t
+dst_key_setflags(dst_key_t *key, uint32_t flags) {
+	REQUIRE(VALID_KEY(key));
+	key->key_flags = flags;
+	return (computeid(key));
+}
+
+void
+dst_key_format(const dst_key_t *key, char *cp, unsigned int size) {
+	char namestr[DNS_NAME_FORMATSIZE];
+	char algstr[DNS_NAME_FORMATSIZE];
+
+	dns_name_format(dst_key_name(key), namestr, sizeof(namestr));
+	dns_secalg_format((dns_secalg_t)dst_key_alg(key), algstr,
+			  sizeof(algstr));
+	snprintf(cp, size, "%s/%s/%d", namestr, algstr, dst_key_id(key));
+}
+
+isc_result_t
+dst_key_dump(dst_key_t *key, isc_mem_t *mctx, char **buffer, int *length) {
+	REQUIRE(buffer != NULL && *buffer == NULL);
+	REQUIRE(length != NULL && *length == 0);
+	REQUIRE(VALID_KEY(key));
+
+	if (key->func->dump == NULL) {
+		return (ISC_R_NOTIMPLEMENTED);
+	}
+	return (key->func->dump(key, mctx, buffer, length));
+}
+
+isc_result_t
+dst_key_restore(dns_name_t *name, unsigned int alg, unsigned int flags,
+		unsigned int protocol, dns_rdataclass_t rdclass,
+		isc_mem_t *mctx, const char *keystr, dst_key_t **keyp) {
+	isc_result_t result;
+	dst_key_t *key;
+
+	REQUIRE(dst_initialized);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+
+	if (alg >= DST_MAX_ALGS || dst_t_func[alg] == NULL) {
+		return (DST_R_UNSUPPORTEDALG);
+	}
+
+	if (dst_t_func[alg]->restore == NULL) {
+		return (ISC_R_NOTIMPLEMENTED);
+	}
+
+	key = get_key_struct(name, alg, flags, protocol, 0, rdclass, 0, mctx);
+	if (key == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	result = (dst_t_func[alg]->restore)(key, keystr);
+	if (result == ISC_R_SUCCESS) {
+		*keyp = key;
+	} else {
+		dst_key_free(&key);
+	}
+
+	return (result);
+}
+
+/***
+ *** Static methods
+ ***/
+
+/*%
+ * Allocates a key structure and fills in some of the fields.
+ */
+static dst_key_t *
+get_key_struct(const dns_name_t *name, unsigned int alg, unsigned int flags,
+	       unsigned int protocol, unsigned int bits,
+	       dns_rdataclass_t rdclass, dns_ttl_t ttl, isc_mem_t *mctx) {
+	dst_key_t *key;
+	int i;
+
+	key = isc_mem_get(mctx, sizeof(dst_key_t));
+
+	memset(key, 0, sizeof(dst_key_t));
+
+	key->key_name = isc_mem_get(mctx, sizeof(dns_name_t));
+
+	dns_name_init(key->key_name, NULL);
+	dns_name_dup(name, mctx, key->key_name);
+
+	isc_refcount_init(&key->refs, 1);
+	isc_mem_attach(mctx, &key->mctx);
+	key->key_alg = alg;
+	key->key_flags = flags;
+	key->key_proto = protocol;
+	key->keydata.generic = NULL;
+	key->key_size = bits;
+	key->key_class = rdclass;
+	key->key_ttl = ttl;
+	key->func = dst_t_func[alg];
+	key->fmt_major = 0;
+	key->fmt_minor = 0;
+	for (i = 0; i < (DST_MAX_TIMES + 1); i++) {
+		key->times[i] = 0;
+		key->timeset[i] = false;
+	}
+	isc_mutex_init(&key->mdlock);
+	key->inactive = false;
+	key->magic = KEY_MAGIC;
+	return (key);
+}
+
+bool
+dst_key_inactive(const dst_key_t *key) {
+	REQUIRE(VALID_KEY(key));
+
+	return (key->inactive);
+}
+
+void
+dst_key_setinactive(dst_key_t *key, bool inactive) {
+	REQUIRE(VALID_KEY(key));
+
+	key->inactive = inactive;
+}
+
+/*%
+ * Reads a public key from disk.
+ */
+isc_result_t
+dst_key_read_public(const char *filename, int type, isc_mem_t *mctx,
+		    dst_key_t **keyp) {
+	u_char rdatabuf[DST_KEY_MAXSIZE];
+	isc_buffer_t b;
+	dns_fixedname_t name;
+	isc_lex_t *lex = NULL;
+	isc_token_t token;
+	isc_result_t ret;
+	dns_rdata_t rdata = DNS_RDATA_INIT;
+	unsigned int opt = ISC_LEXOPT_DNSMULTILINE;
+	dns_rdataclass_t rdclass = dns_rdataclass_in;
+	isc_lexspecials_t specials;
+	uint32_t ttl = 0;
+	isc_result_t result;
+	dns_rdatatype_t keytype;
+
+	/*
+	 * Open the file and read its formatted contents
+	 * File format:
+	 *    domain.name [ttl] [class] [KEY|DNSKEY] <flags> <protocol>
+	 * <algorithm> <key>
+	 */
+
+	/* 1500 should be large enough for any key */
+	ret = isc_lex_create(mctx, 1500, &lex);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	memset(specials, 0, sizeof(specials));
+	specials['('] = 1;
+	specials[')'] = 1;
+	specials['"'] = 1;
+	isc_lex_setspecials(lex, specials);
+	isc_lex_setcomments(lex, ISC_LEXCOMMENT_DNSMASTERFILE);
+
+	ret = isc_lex_openfile(lex, filename);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	/* Read the domain name */
+	NEXTTOKEN(lex, opt, &token);
+	if (token.type != isc_tokentype_string) {
+		BADTOKEN();
+	}
+
+	/*
+	 * We don't support "@" in .key files.
+	 */
+	if (!strcmp(DST_AS_STR(token), "@")) {
+		BADTOKEN();
+	}
+
+	dns_fixedname_init(&name);
+	isc_buffer_init(&b, DST_AS_STR(token), strlen(DST_AS_STR(token)));
+	isc_buffer_add(&b, strlen(DST_AS_STR(token)));
+	ret = dns_name_fromtext(dns_fixedname_name(&name), &b, dns_rootname, 0,
+				NULL);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	/* Read the next word: either TTL, class, or 'KEY' */
+	NEXTTOKEN(lex, opt, &token);
+
+	if (token.type != isc_tokentype_string) {
+		BADTOKEN();
+	}
+
+	/* If it's a TTL, read the next one */
+	result = dns_ttl_fromtext(&token.value.as_textregion, &ttl);
+	if (result == ISC_R_SUCCESS) {
+		NEXTTOKEN(lex, opt, &token);
+	}
+
+	if (token.type != isc_tokentype_string) {
+		BADTOKEN();
+	}
+
+	ret = dns_rdataclass_fromtext(&rdclass, &token.value.as_textregion);
+	if (ret == ISC_R_SUCCESS) {
+		NEXTTOKEN(lex, opt, &token);
+	}
+
+	if (token.type != isc_tokentype_string) {
+		BADTOKEN();
+	}
+
+	if (strcasecmp(DST_AS_STR(token), "DNSKEY") == 0) {
+		keytype = dns_rdatatype_dnskey;
+	} else if (strcasecmp(DST_AS_STR(token), "KEY") == 0) {
+		keytype = dns_rdatatype_key; /*%< SIG(0), TKEY */
+	} else {
+		BADTOKEN();
+	}
+
+	if (((type & DST_TYPE_KEY) != 0 && keytype != dns_rdatatype_key) ||
+	    ((type & DST_TYPE_KEY) == 0 && keytype != dns_rdatatype_dnskey))
+	{
+		ret = DST_R_BADKEYTYPE;
+		goto cleanup;
+	}
+
+	isc_buffer_init(&b, rdatabuf, sizeof(rdatabuf));
+	ret = dns_rdata_fromtext(&rdata, rdclass, keytype, lex, NULL, false,
+				 mctx, &b, NULL);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	ret = dst_key_fromdns(dns_fixedname_name(&name), rdclass, &b, mctx,
+			      keyp);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	dst_key_setttl(*keyp, ttl);
+
+cleanup:
+	if (lex != NULL) {
+		isc_lex_destroy(&lex);
+	}
+	return (ret);
+}
+
+static int
+find_metadata(const char *s, const char *tags[], int ntags) {
+	for (int i = 0; i < ntags; i++) {
+		if (tags[i] != NULL && strcasecmp(s, tags[i]) == 0) {
+			return (i);
+		}
+	}
+	return (-1);
+}
+
+static int
+find_numericdata(const char *s) {
+	return (find_metadata(s, numerictags, NUMERIC_NTAGS));
+}
+
+static int
+find_booleandata(const char *s) {
+	return (find_metadata(s, booleantags, BOOLEAN_NTAGS));
+}
+
+static int
+find_timingdata(const char *s) {
+	return (find_metadata(s, timingtags, TIMING_NTAGS));
+}
+
+static int
+find_keystatedata(const char *s) {
+	return (find_metadata(s, keystatestags, KEYSTATES_NTAGS));
+}
+
+static isc_result_t
+keystate_fromtext(const char *s, dst_key_state_t *state) {
+	for (int i = 0; i < KEYSTATES_NVALUES; i++) {
+		if (keystates[i] != NULL && strcasecmp(s, keystates[i]) == 0) {
+			*state = (dst_key_state_t)i;
+			return (ISC_R_SUCCESS);
+		}
+	}
+	return (ISC_R_NOTFOUND);
+}
+
+/*%
+ * Reads a key state from disk.
+ */
+isc_result_t
+dst_key_read_state(const char *filename, isc_mem_t *mctx, dst_key_t **keyp) {
+	isc_lex_t *lex = NULL;
+	isc_token_t token;
+	isc_result_t ret;
+	unsigned int opt = ISC_LEXOPT_EOL;
+
+	ret = isc_lex_create(mctx, 1500, &lex);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+	isc_lex_setcomments(lex, ISC_LEXCOMMENT_DNSMASTERFILE);
+
+	ret = isc_lex_openfile(lex, filename);
+	if (ret != ISC_R_SUCCESS) {
+		goto cleanup;
+	}
+
+	/*
+	 * Read the comment line.
+	 */
+	READLINE(lex, opt, &token);
+
+	/*
+	 * Read the algorithm line.
+	 */
+	NEXTTOKEN(lex, opt, &token);
+	if (token.type != isc_tokentype_string ||
+	    strcmp(DST_AS_STR(token), STATE_ALGORITHM_STR) != 0)
+	{
+		BADTOKEN();
+	}
+
+	NEXTTOKEN(lex, opt | ISC_LEXOPT_NUMBER, &token);
+	if (token.type != isc_tokentype_number ||
+	    token.value.as_ulong != (unsigned long)dst_key_alg(*keyp))
+	{
+		BADTOKEN();
+	}
+
+	READLINE(lex, opt, &token);
+
+	/*
+	 * Read the length line.
+	 */
+	NEXTTOKEN(lex, opt, &token);
+	if (token.type != isc_tokentype_string ||
+	    strcmp(DST_AS_STR(token), STATE_LENGTH_STR) != 0)
+	{
+		BADTOKEN();
+	}
+
+	NEXTTOKEN(lex, opt | ISC_LEXOPT_NUMBER, &token);
+	if (token.type != isc_tokentype_number ||
+	    token.value.as_ulong != (unsigned long)dst_key_size(*keyp))
+	{
+		BADTOKEN();
+	}
+
+	READLINE(lex, opt, &token);
+
+	/*
+	 * Read the metadata.
+	 */
+	for (int n = 0; n < MAX_NTAGS; n++) {
+		int tag;
+
+		NEXTTOKEN_OR_EOF(lex, opt, &token);
+		if (ret == ISC_R_EOF) {
+			break;
+		}
+		if (token.type != isc_tokentype_string) {
+			BADTOKEN();
+		}
+
+		/* Numeric metadata */
+		tag = find_numericdata(DST_AS_STR(token));
+		if (tag >= 0) {
+			INSIST(tag < NUMERIC_NTAGS);
+
+			NEXTTOKEN(lex, opt | ISC_LEXOPT_NUMBER, &token);
+			if (token.type != isc_tokentype_number) {
+				BADTOKEN();
+			}
+
+			dst_key_setnum(*keyp, tag, token.value.as_ulong);
+			goto next;
+		}
+
+		/* Boolean metadata */
+		tag = find_booleandata(DST_AS_STR(token));
+		if (tag >= 0) {
+			INSIST(tag < BOOLEAN_NTAGS);
+
+			NEXTTOKEN(lex, opt, &token);
+			if (token.type != isc_tokentype_string) {
+				BADTOKEN();
+			}
+
+			if (strcmp(DST_AS_STR(token), "yes") == 0) {
+				dst_key_setbool(*keyp, tag, true);
+			} else if (strcmp(DST_AS_STR(token), "no") == 0) {
+				dst_key_setbool(*keyp, tag, false);
+			} else {
+				BADTOKEN();
+			}
+			goto next;
+		}
+
+		/* Timing metadata */
+		tag = find_timingdata(DST_AS_STR(token));
+		if (tag >= 0) {
+			uint32_t when;
+
+			INSIST(tag < TIMING_NTAGS);
+
+			NEXTTOKEN(lex, opt, &token);
+			if (token.type != isc_tokentype_string) {
+				BADTOKEN();
+			}
+
+			ret = dns_time32_fromtext(DST_AS_STR(token), &when);
+			if (ret != ISC_R_SUCCESS) {
+				goto cleanup;
+			}
+
+			dst_key_settime(*keyp, tag, when);
+			goto next;
+		}
+
+		/* Keystate metadata */
+		tag = find_keystatedata(DST_AS_STR(token));
+		if (tag >= 0) {
+			dst_key_state_t state;
+
+			INSIST(tag < KEYSTATES_NTAGS);
+
+			NEXTTOKEN(lex, opt, &token);
+			if (token.type != isc_tokentype_string) {
+				BADTOKEN();
+			}
+
+			ret = keystate_fromtext(DST_AS_STR(token), &state);
+			if (ret != ISC_R_SUCCESS) {
+				goto cleanup;
+			}
+
+			dst_key_setstate(*keyp, tag, state);
+			goto next;
+		}
+
+	next:
+		READLINE(lex, opt, &token);
+	}
+
+	/* Done, successfully parsed the whole file. */
+	ret = ISC_R_SUCCESS;
+
+cleanup:
+	if (lex != NULL) {
+		isc_lex_destroy(&lex);
+	}
+	return (ret);
+}
+
+static bool
+issymmetric(const dst_key_t *key) {
+	REQUIRE(dst_initialized);
+	REQUIRE(VALID_KEY(key));
+
+	/* XXXVIX this switch statement is too sparse to gen a jump table. */
+	switch (key->key_alg) {
+	case DST_ALG_RSASHA1:
+	case DST_ALG_NSEC3RSASHA1:
+	case DST_ALG_RSASHA256:
+	case DST_ALG_RSASHA512:
+	case DST_ALG_DH:
+	case DST_ALG_ECDSA256:
+	case DST_ALG_ECDSA384:
+	case DST_ALG_ED25519:
+	case DST_ALG_ED448:
+		return (false);
+	case DST_ALG_HMACMD5:
+	case DST_ALG_HMACSHA1:
+	case DST_ALG_HMACSHA224:
+	case DST_ALG_HMACSHA256:
+	case DST_ALG_HMACSHA384:
+	case DST_ALG_HMACSHA512:
+	case DST_ALG_GSSAPI:
+		return (true);
+	default:
+		return (false);
+	}
+}
+
+/*%
+ * Write key boolean metadata to a file pointer, preceded by 'tag'
+ */
+static void
+printbool(const dst_key_t *key, int type, const char *tag, FILE *stream) {
+	isc_result_t result;
+	bool value = 0;
+
+	result = dst_key_getbool(key, type, &value);
+	if (result != ISC_R_SUCCESS) {
+		return;
+	}
+	fprintf(stream, "%s: %s\n", tag, value ? "yes" : "no");
+}
+
+/*%
+ * Write key numeric metadata to a file pointer, preceded by 'tag'
+ */
+static void
+printnum(const dst_key_t *key, int type, const char *tag, FILE *stream) {
+	isc_result_t result;
+	uint32_t value = 0;
+
+	result = dst_key_getnum(key, type, &value);
+	if (result != ISC_R_SUCCESS) {
+		return;
+	}
+	fprintf(stream, "%s: %u\n", tag, value);
+}
+
+/*%
+ * Write key timing metadata to a file pointer, preceded by 'tag'
+ */
+static void
+printtime(const dst_key_t *key, int type, const char *tag, FILE *stream) {
+	isc_result_t result;
+	char output[26]; /* Minimum buffer as per ctime_r() specification. */
+	isc_stdtime_t when;
+	char utc[sizeof("YYYYMMDDHHSSMM")];
+	isc_buffer_t b;
+	isc_region_t r;
+
+	result = dst_key_gettime(key, type, &when);
+	if (result == ISC_R_NOTFOUND) {
+		return;
+	}
+
+	isc_stdtime_tostring(when, output, sizeof(output));
+	isc_buffer_init(&b, utc, sizeof(utc));
+	result = dns_time32_totext(when, &b);
+	if (result != ISC_R_SUCCESS) {
+		goto error;
+	}
+
+	isc_buffer_usedregion(&b, &r);
+	fprintf(stream, "%s: %.*s (%s)\n", tag, (int)r.length, r.base, output);
+	return;
+
+error:
+	fprintf(stream, "%s: (set, unable to display)\n", tag);
+}
+
+/*%
+ * Write key state metadata to a file pointer, preceded by 'tag'
+ */
+static void
+printstate(const dst_key_t *key, int type, const char *tag, FILE *stream) {
+	isc_result_t result;
+	dst_key_state_t value = 0;
+
+	result = dst_key_getstate(key, type, &value);
+	if (result != ISC_R_SUCCESS) {
+		return;
+	}
+	fprintf(stream, "%s: %s\n", tag, keystates[value]);
+}
+
+/*%
+ * Writes a key state to disk.
+ */
+static isc_result_t
+write_key_state(const dst_key_t *key, int type, const char *directory) {
+	FILE *fp;
+	isc_buffer_t fileb;
+	isc_buffer_t tmpb;
+	char filename[NAME_MAX];
+	char tmpname[NAME_MAX];
+	isc_result_t result;
+
+	REQUIRE(VALID_KEY(key));
+
+	/*
+	 * Make the filename.
+	 */
+	isc_buffer_init(&fileb, filename, sizeof(filename));
+	result = dst_key_buildfilename(key, DST_TYPE_STATE, directory, &fileb);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	isc_buffer_init(&tmpb, tmpname, sizeof(tmpname));
+	result = dst_key_buildfilename(key, DST_TYPE_TEMPLATE, directory,
+				       &tmpb);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	mode_t mode = issymmetric(key) ? S_IRUSR | S_IWUSR
+				       : S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+
+	/* Create temporary public key file. */
+	fp = dst_key_open(tmpname, mode);
+	if (fp == NULL) {
+		return (DST_R_WRITEERROR);
+	}
+
+	/* Write key state */
+	if ((type & DST_TYPE_KEY) == 0) {
+		fprintf(fp, "; This is the state of key %d, for ", key->key_id);
+		result = dns_name_print(key->key_name, fp);
+		if (result != ISC_R_SUCCESS) {
+			return (dst_key_cleanup(tmpname, fp));
+		}
+		fputc('\n', fp);
+
+		fprintf(fp, "Algorithm: %u\n", key->key_alg);
+		fprintf(fp, "Length: %u\n", key->key_size);
+
+		printnum(key, DST_NUM_LIFETIME, "Lifetime", fp);
+		printnum(key, DST_NUM_PREDECESSOR, "Predecessor", fp);
+		printnum(key, DST_NUM_SUCCESSOR, "Successor", fp);
+
+		printbool(key, DST_BOOL_KSK, "KSK", fp);
+		printbool(key, DST_BOOL_ZSK, "ZSK", fp);
+
+		printtime(key, DST_TIME_CREATED, "Generated", fp);
+		printtime(key, DST_TIME_PUBLISH, "Published", fp);
+		printtime(key, DST_TIME_ACTIVATE, "Active", fp);
+		printtime(key, DST_TIME_INACTIVE, "Retired", fp);
+		printtime(key, DST_TIME_REVOKE, "Revoked", fp);
+		printtime(key, DST_TIME_DELETE, "Removed", fp);
+		printtime(key, DST_TIME_DSPUBLISH, "DSPublish", fp);
+		printtime(key, DST_TIME_DSDELETE, "DSRemoved", fp);
+		printtime(key, DST_TIME_SYNCPUBLISH, "PublishCDS", fp);
+		printtime(key, DST_TIME_SYNCDELETE, "DeleteCDS", fp);
+
+		printnum(key, DST_NUM_DSPUBCOUNT, "DSPubCount", fp);
+		printnum(key, DST_NUM_DSDELCOUNT, "DSDelCount", fp);
+
+		printtime(key, DST_TIME_DNSKEY, "DNSKEYChange", fp);
+		printtime(key, DST_TIME_ZRRSIG, "ZRRSIGChange", fp);
+		printtime(key, DST_TIME_KRRSIG, "KRRSIGChange", fp);
+		printtime(key, DST_TIME_DS, "DSChange", fp);
+
+		printstate(key, DST_KEY_DNSKEY, "DNSKEYState", fp);
+		printstate(key, DST_KEY_ZRRSIG, "ZRRSIGState", fp);
+		printstate(key, DST_KEY_KRRSIG, "KRRSIGState", fp);
+		printstate(key, DST_KEY_DS, "DSState", fp);
+		printstate(key, DST_KEY_GOAL, "GoalState", fp);
+	}
+
+	return (dst_key_close(tmpname, fp, filename));
+}
+
+/*%
+ * Writes a public key to disk in DNS format.
+ */
+static isc_result_t
+write_public_key(const dst_key_t *key, int type, const char *directory) {
+	FILE *fp;
+	isc_buffer_t keyb, tmpb, textb, fileb, classb;
+	isc_region_t r;
+	char tmpname[NAME_MAX];
+	char filename[NAME_MAX];
+	unsigned char key_array[DST_KEY_MAXSIZE];
+	char text_array[DST_KEY_MAXTEXTSIZE];
+	char class_array[10];
+	isc_result_t result;
+	dns_rdata_t rdata = DNS_RDATA_INIT;
+
+	REQUIRE(VALID_KEY(key));
+
+	isc_buffer_init(&keyb, key_array, sizeof(key_array));
+	isc_buffer_init(&textb, text_array, sizeof(text_array));
+	isc_buffer_init(&classb, class_array, sizeof(class_array));
+
+	result = dst_key_todns(key, &keyb);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	isc_buffer_usedregion(&keyb, &r);
+	dns_rdata_fromregion(&rdata, key->key_class, dns_rdatatype_dnskey, &r);
+
+	result = dns_rdata_totext(&rdata, (dns_name_t *)NULL, &textb);
+	if (result != ISC_R_SUCCESS) {
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+
+	result = dns_rdataclass_totext(key->key_class, &classb);
+	if (result != ISC_R_SUCCESS) {
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+
+	/*
+	 * Make the filename.
+	 */
+	isc_buffer_init(&fileb, filename, sizeof(filename));
+	result = dst_key_buildfilename(key, DST_TYPE_PUBLIC, directory, &fileb);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	isc_buffer_init(&tmpb, tmpname, sizeof(tmpname));
+	result = dst_key_buildfilename(key, DST_TYPE_TEMPLATE, directory,
+				       &tmpb);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	/* Create temporary public key file. */
+	mode_t mode = issymmetric(key) ? S_IRUSR | S_IWUSR
+				       : S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+
+	fp = dst_key_open(tmpname, mode);
+	if (fp == NULL) {
+		return (DST_R_WRITEERROR);
+	}
+
+	/* Write key information in comments */
+	if ((type & DST_TYPE_KEY) == 0) {
+		fprintf(fp, "; This is a %s%s-signing key, keyid %d, for ",
+			(key->key_flags & DNS_KEYFLAG_REVOKE) != 0 ? "revoked "
+								   : "",
+			(key->key_flags & DNS_KEYFLAG_KSK) != 0 ? "key"
+								: "zone",
+			key->key_id);
+		result = dns_name_print(key->key_name, fp);
+		if (result != ISC_R_SUCCESS) {
+			return (dst_key_cleanup(tmpname, fp));
+		}
+		fputc('\n', fp);
+
+		printtime(key, DST_TIME_CREATED, "; Created", fp);
+		printtime(key, DST_TIME_PUBLISH, "; Publish", fp);
+		printtime(key, DST_TIME_ACTIVATE, "; Activate", fp);
+		printtime(key, DST_TIME_REVOKE, "; Revoke", fp);
+		printtime(key, DST_TIME_INACTIVE, "; Inactive", fp);
+		printtime(key, DST_TIME_DELETE, "; Delete", fp);
+		printtime(key, DST_TIME_SYNCPUBLISH, "; SyncPublish", fp);
+		printtime(key, DST_TIME_SYNCDELETE, "; SyncDelete", fp);
+	}
+
+	/* Now print the actual key */
+	result = dns_name_print(key->key_name, fp);
+	if (result != ISC_R_SUCCESS) {
+		return (dst_key_cleanup(tmpname, fp));
+	}
+	fprintf(fp, " ");
+
+	if (key->key_ttl != 0) {
+		fprintf(fp, "%u ", key->key_ttl);
+	}
+
+	isc_buffer_usedregion(&classb, &r);
+	if ((unsigned)fwrite(r.base, 1, r.length, fp) != r.length) {
+		return (dst_key_cleanup(tmpname, fp));
+	}
+
+	if ((type & DST_TYPE_KEY) != 0) {
+		fprintf(fp, " KEY ");
+	} else {
+		fprintf(fp, " DNSKEY ");
+	}
+
+	isc_buffer_usedregion(&textb, &r);
+	if ((unsigned)fwrite(r.base, 1, r.length, fp) != r.length) {
+		return (dst_key_cleanup(tmpname, fp));
+	}
+
+	fputc('\n', fp);
+
+	return (dst_key_close(tmpname, fp, filename));
+}
+
+static isc_result_t
+buildfilename(dns_name_t *name, dns_keytag_t id, unsigned int alg,
+	      unsigned int type, const char *directory, isc_buffer_t *out) {
+	const char *suffix = "";
+	isc_result_t result;
+
+	REQUIRE(out != NULL);
+
+	if ((type & DST_TYPE_PRIVATE) != 0) {
+		suffix = ".private";
+	} else if ((type & DST_TYPE_PUBLIC) != 0) {
+		suffix = ".key";
+	} else if ((type & DST_TYPE_STATE) != 0) {
+		suffix = ".state";
+	} else if ((type & DST_TYPE_TEMPLATE) != 0) {
+		suffix = ".XXXXXX";
+	}
+
+	if (directory != NULL) {
+		if (isc_buffer_availablelength(out) < strlen(directory)) {
+			return (ISC_R_NOSPACE);
+		}
+		isc_buffer_putstr(out, directory);
+		if (strlen(directory) > 0U &&
+		    directory[strlen(directory) - 1] != '/')
+		{
+			isc_buffer_putstr(out, "/");
+		}
+	}
+	if (isc_buffer_availablelength(out) < 1) {
+		return (ISC_R_NOSPACE);
+	}
+	isc_buffer_putstr(out, "K");
+	result = dns_name_tofilenametext(name, false, out);
+	if (result != ISC_R_SUCCESS) {
+		return (result);
+	}
+
+	return (isc_buffer_printf(out, "+%03d+%05d%s", alg, id, suffix));
+}
+
+static isc_result_t
+computeid(dst_key_t *key) {
+	isc_buffer_t dnsbuf;
+	unsigned char dns_array[DST_KEY_MAXSIZE];
+	isc_region_t r;
+	isc_result_t ret;
+
+	isc_buffer_init(&dnsbuf, dns_array, sizeof(dns_array));
+	ret = dst_key_todns(key, &dnsbuf);
+	if (ret != ISC_R_SUCCESS) {
+		return (ret);
+	}
+
+	isc_buffer_usedregion(&dnsbuf, &r);
+	key->key_id = dst_region_computeid(&r);
+	key->key_rid = dst_region_computerid(&r);
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+frombuffer(const dns_name_t *name, unsigned int alg, unsigned int flags,
+	   unsigned int protocol, dns_rdataclass_t rdclass,
+	   isc_buffer_t *source, isc_mem_t *mctx, dst_key_t **keyp) {
+	dst_key_t *key;
+	isc_result_t ret;
+
+	REQUIRE(dns_name_isabsolute(name));
+	REQUIRE(source != NULL);
+	REQUIRE(mctx != NULL);
+	REQUIRE(keyp != NULL && *keyp == NULL);
+
+	key = get_key_struct(name, alg, flags, protocol, 0, rdclass, 0, mctx);
+	if (key == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	if (isc_buffer_remaininglength(source) > 0) {
+		ret = algorithm_status(alg);
+		if (ret != ISC_R_SUCCESS) {
+			dst_key_free(&key);
+			return (ret);
+		}
+		if (key->func->fromdns == NULL) {
+			dst_key_free(&key);
+			return (DST_R_UNSUPPORTEDALG);
+		}
+
+		ret = key->func->fromdns(key, source);
+		if (ret != ISC_R_SUCCESS) {
+			dst_key_free(&key);
+			return (ret);
+		}
+	}
+
+	*keyp = key;
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+algorithm_status(unsigned int alg) {
+	REQUIRE(dst_initialized);
+
+	if (dst_algorithm_supported(alg)) {
+		return (ISC_R_SUCCESS);
+	}
+	return (DST_R_UNSUPPORTEDALG);
+}
+
+static isc_result_t
+addsuffix(char *filename, int len, const char *odirname, const char *ofilename,
+	  const char *suffix) {
+	int olen = strlen(ofilename);
+	int n;
+
+	if (olen > 1 && ofilename[olen - 1] == '.') {
+		olen -= 1;
+	} else if (olen > 8 && strcmp(ofilename + olen - 8, ".private") == 0) {
+		olen -= 8;
+	} else if (olen > 4 && strcmp(ofilename + olen - 4, ".key") == 0) {
+		olen -= 4;
+	}
+
+	if (odirname == NULL) {
+		n = snprintf(filename, len, "%.*s%s", olen, ofilename, suffix);
+	} else {
+		n = snprintf(filename, len, "%s/%.*s%s", odirname, olen,
+			     ofilename, suffix);
+	}
+	if (n < 0) {
+		return (ISC_R_FAILURE);
+	}
+	if (n >= len) {
+		return (ISC_R_NOSPACE);
+	}
+	return (ISC_R_SUCCESS);
+}
+
+isc_buffer_t *
+dst_key_tkeytoken(const dst_key_t *key) {
+	REQUIRE(VALID_KEY(key));
+	return (key->key_tkeytoken);
+}
+
+/*
+ * A key is considered unused if it does not have any timing metadata set
+ * other than "Created".
+ *
+ */
+bool
+dst_key_is_unused(dst_key_t *key) {
+	isc_stdtime_t val;
+	dst_key_state_t st;
+	int state_type;
+	bool state_type_set;
+
+	REQUIRE(VALID_KEY(key));
+
+	/*
+	 * None of the key timing metadata, except Created, may be set.  Key
+	 * state times may be set only if their respective state is HIDDEN.
+	 */
+	for (int i = 0; i < DST_MAX_TIMES + 1; i++) {
+		state_type_set = false;
+
+		switch (i) {
+		case DST_TIME_CREATED:
+			break;
+		case DST_TIME_DNSKEY:
+			state_type = DST_KEY_DNSKEY;
+			state_type_set = true;
+			break;
+		case DST_TIME_ZRRSIG:
+			state_type = DST_KEY_ZRRSIG;
+			state_type_set = true;
+			break;
+		case DST_TIME_KRRSIG:
+			state_type = DST_KEY_KRRSIG;
+			state_type_set = true;
+			break;
+		case DST_TIME_DS:
+			state_type = DST_KEY_DS;
+			state_type_set = true;
+			break;
+		default:
+			break;
+		}
+
+		/* Created is fine. */
+		if (i == DST_TIME_CREATED) {
+			continue;
+		}
+		/* No such timing metadata found, that is fine too. */
+		if (dst_key_gettime(key, i, &val) == ISC_R_NOTFOUND) {
+			continue;
+		}
+		/*
+		 * Found timing metadata and it is not related to key states.
+		 * This key is used.
+		 */
+		if (!state_type_set) {
+			return (false);
+		}
+		/*
+		 * If the state is not HIDDEN, the key is in use.
+		 * If the state is not set, this is odd and we default to NA.
+		 */
+		if (dst_key_getstate(key, state_type, &st) != ISC_R_SUCCESS) {
+			st = DST_KEY_STATE_NA;
+		}
+		if (st != DST_KEY_STATE_HIDDEN) {
+			return (false);
+		}
+	}
+	/* This key is unused. */
+	return (true);
+}
+
+isc_result_t
+dst_key_role(dst_key_t *key, bool *ksk, bool *zsk) {
+	bool k = false, z = false;
+	isc_result_t result, ret = ISC_R_SUCCESS;
+
+	if (ksk != NULL) {
+		result = dst_key_getbool(key, DST_BOOL_KSK, &k);
+		if (result == ISC_R_SUCCESS) {
+			*ksk = k;
+		} else {
+			*ksk = ((dst_key_flags(key) & DNS_KEYFLAG_KSK) != 0);
+			ret = result;
+		}
+	}
+
+	if (zsk != NULL) {
+		result = dst_key_getbool(key, DST_BOOL_ZSK, &z);
+		if (result == ISC_R_SUCCESS) {
+			*zsk = z;
+		} else {
+			*zsk = ((dst_key_flags(key) & DNS_KEYFLAG_KSK) == 0);
+			ret = result;
+		}
+	}
+	return (ret);
+}
+
+/* Hints on key whether it can be published and/or used for signing. */
+
+bool
+dst_key_is_published(dst_key_t *key, isc_stdtime_t now,
+		     isc_stdtime_t *publish) {
+	dst_key_state_t state;
+	isc_result_t result;
+	isc_stdtime_t when;
+	bool state_ok = true, time_ok = false;
+
+	REQUIRE(VALID_KEY(key));
+
+	result = dst_key_gettime(key, DST_TIME_PUBLISH, &when);
+	if (result == ISC_R_SUCCESS) {
+		*publish = when;
+		time_ok = (when <= now);
+	}
+
+	/* Check key states:
+	 * If the DNSKEY state is RUMOURED or OMNIPRESENT, it means it
+	 * should be published.
+	 */
+	result = dst_key_getstate(key, DST_KEY_DNSKEY, &state);
+	if (result == ISC_R_SUCCESS) {
+		state_ok = ((state == DST_KEY_STATE_RUMOURED) ||
+			    (state == DST_KEY_STATE_OMNIPRESENT));
+		/*
+		 * Key states trump timing metadata.
+		 * Ignore inactive time.
+		 */
+		time_ok = true;
+	}
+
+	return (state_ok && time_ok);
+}
+
+bool
+dst_key_is_active(dst_key_t *key, isc_stdtime_t now) {
+	dst_key_state_t state;
+	isc_result_t result;
+	isc_stdtime_t when = 0;
+	bool ksk = false, zsk = false, inactive = false;
+	bool ds_ok = true, zrrsig_ok = true, time_ok = false;
+
+	REQUIRE(VALID_KEY(key));
+
+	result = dst_key_gettime(key, DST_TIME_INACTIVE, &when);
+	if (result == ISC_R_SUCCESS) {
+		inactive = (when <= now);
+	}
+
+	result = dst_key_gettime(key, DST_TIME_ACTIVATE, &when);
+	if (result == ISC_R_SUCCESS) {
+		time_ok = (when <= now);
+	}
+
+	(void)dst_key_role(key, &ksk, &zsk);
+
+	/* Check key states:
+	 * KSK: If the DS is RUMOURED or OMNIPRESENT the key is considered
+	 * active.
+	 */
+	if (ksk) {
+		result = dst_key_getstate(key, DST_KEY_DS, &state);
+		if (result == ISC_R_SUCCESS) {
+			ds_ok = ((state == DST_KEY_STATE_RUMOURED) ||
+				 (state == DST_KEY_STATE_OMNIPRESENT));
+			/*
+			 * Key states trump timing metadata.
+			 * Ignore inactive time.
+			 */
+			time_ok = true;
+			inactive = false;
+		}
+	}
+	/*
+	 * ZSK: If the ZRRSIG state is RUMOURED or OMNIPRESENT, it means the
+	 * key is active.
+	 */
+	if (zsk) {
+		result = dst_key_getstate(key, DST_KEY_ZRRSIG, &state);
+		if (result == ISC_R_SUCCESS) {
+			zrrsig_ok = ((state == DST_KEY_STATE_RUMOURED) ||
+				     (state == DST_KEY_STATE_OMNIPRESENT));
+			/*
+			 * Key states trump timing metadata.
+			 * Ignore inactive time.
+			 */
+			time_ok = true;
+			inactive = false;
+		}
+	}
+	return (ds_ok && zrrsig_ok && time_ok && !inactive);
+}
+
+bool
+dst_key_is_signing(dst_key_t *key, int role, isc_stdtime_t now,
+		   isc_stdtime_t *active) {
+	dst_key_state_t state;
+	isc_result_t result;
+	isc_stdtime_t when = 0;
+	bool ksk = false, zsk = false, inactive = false;
+	bool krrsig_ok = true, zrrsig_ok = true, time_ok = false;
+
+	REQUIRE(VALID_KEY(key));
+
+	result = dst_key_gettime(key, DST_TIME_INACTIVE, &when);
+	if (result == ISC_R_SUCCESS) {
+		inactive = (when <= now);
+	}
+
+	result = dst_key_gettime(key, DST_TIME_ACTIVATE, &when);
+	if (result == ISC_R_SUCCESS) {
+		*active = when;
+		time_ok = (when <= now);
+	}
+
+	(void)dst_key_role(key, &ksk, &zsk);
+
+	/* Check key states:
+	 * If the RRSIG state is RUMOURED or OMNIPRESENT, it means the key
+	 * is active.
+	 */
+	if (ksk && role == DST_BOOL_KSK) {
+		result = dst_key_getstate(key, DST_KEY_KRRSIG, &state);
+		if (result == ISC_R_SUCCESS) {
+			krrsig_ok = ((state == DST_KEY_STATE_RUMOURED) ||
+				     (state == DST_KEY_STATE_OMNIPRESENT));
+			/*
+			 * Key states trump timing metadata.
+			 * Ignore inactive time.
+			 */
+			time_ok = true;
+			inactive = false;
+		}
+	} else if (zsk && role == DST_BOOL_ZSK) {
+		result = dst_key_getstate(key, DST_KEY_ZRRSIG, &state);
+		if (result == ISC_R_SUCCESS) {
+			zrrsig_ok = ((state == DST_KEY_STATE_RUMOURED) ||
+				     (state == DST_KEY_STATE_OMNIPRESENT));
+			/*
+			 * Key states trump timing metadata.
+			 * Ignore inactive time.
+			 */
+			time_ok = true;
+			inactive = false;
+		}
+	}
+	return (krrsig_ok && zrrsig_ok && time_ok && !inactive);
+}
+
+bool
+dst_key_is_revoked(dst_key_t *key, isc_stdtime_t now, isc_stdtime_t *revoke) {
+	isc_result_t result;
+	isc_stdtime_t when = 0;
+	bool time_ok = false;
+
+	REQUIRE(VALID_KEY(key));
+
+	result = dst_key_gettime(key, DST_TIME_REVOKE, &when);
+	if (result == ISC_R_SUCCESS) {
+		*revoke = when;
+		time_ok = (when <= now);
+	}
+
+	return (time_ok);
+}
+
+bool
+dst_key_is_removed(dst_key_t *key, isc_stdtime_t now, isc_stdtime_t *remove) {
+	dst_key_state_t state;
+	isc_result_t result;
+	isc_stdtime_t when = 0;
+	bool state_ok = true, time_ok = false;
+
+	REQUIRE(VALID_KEY(key));
+
+	if (dst_key_is_unused(key)) {
+		/* This key was never used. */
+		return (false);
+	}
+
+	result = dst_key_gettime(key, DST_TIME_DELETE, &when);
+	if (result == ISC_R_SUCCESS) {
+		*remove = when;
+		time_ok = (when <= now);
+	}
+
+	/* Check key states:
+	 * If the DNSKEY state is UNRETENTIVE or HIDDEN, it means the key
+	 * should not be published.
+	 */
+	result = dst_key_getstate(key, DST_KEY_DNSKEY, &state);
+	if (result == ISC_R_SUCCESS) {
+		state_ok = ((state == DST_KEY_STATE_UNRETENTIVE) ||
+			    (state == DST_KEY_STATE_HIDDEN));
+		/*
+		 * Key states trump timing metadata.
+		 * Ignore delete time.
+		 */
+		time_ok = true;
+	}
+
+	return (state_ok && time_ok);
+}
+
+dst_key_state_t
+dst_key_goal(dst_key_t *key) {
+	dst_key_state_t state;
+	isc_result_t result;
+
+	REQUIRE(VALID_KEY(key));
+
+	result = dst_key_getstate(key, DST_KEY_GOAL, &state);
+	if (result == ISC_R_SUCCESS) {
+		return (state);
+	}
+	return (DST_KEY_STATE_HIDDEN);
+}
+
+bool
+dst_key_haskasp(dst_key_t *key) {
+	REQUIRE(VALID_KEY(key));
+
+	return (key->kasp);
+}
+
+void
+dst_key_copy_metadata(dst_key_t *to, dst_key_t *from) {
+	dst_key_state_t state;
+	isc_stdtime_t when;
+	uint32_t num;
+	bool yesno;
+	isc_result_t result;
+
+	REQUIRE(VALID_KEY(to));
+	REQUIRE(VALID_KEY(from));
+
+	for (int i = 0; i < DST_MAX_TIMES + 1; i++) {
+		result = dst_key_gettime(from, i, &when);
+		if (result == ISC_R_SUCCESS) {
+			dst_key_settime(to, i, when);
+		} else {
+			dst_key_unsettime(to, i);
+		}
+	}
+
+	for (int i = 0; i < DST_MAX_NUMERIC + 1; i++) {
+		result = dst_key_getnum(from, i, &num);
+		if (result == ISC_R_SUCCESS) {
+			dst_key_setnum(to, i, num);
+		} else {
+			dst_key_unsetnum(to, i);
+		}
+	}
+
+	for (int i = 0; i < DST_MAX_BOOLEAN + 1; i++) {
+		result = dst_key_getbool(from, i, &yesno);
+		if (result == ISC_R_SUCCESS) {
+			dst_key_setbool(to, i, yesno);
+		} else {
+			dst_key_unsetbool(to, i);
+		}
+	}
+
+	for (int i = 0; i < DST_MAX_KEYSTATES + 1; i++) {
+		result = dst_key_getstate(from, i, &state);
+		if (result == ISC_R_SUCCESS) {
+			dst_key_setstate(to, i, state);
+		} else {
+			dst_key_unsetstate(to, i);
+		}
+	}
+
+	dst_key_setmodified(to, dst_key_ismodified(from));
+}
+
+const char *
+dst_hmac_algorithm_totext(dst_algorithm_t alg) {
+	switch (alg) {
+	case DST_ALG_HMACMD5:
+		return ("hmac-md5");
+	case DST_ALG_HMACSHA1:
+		return ("hmac-sha1");
+	case DST_ALG_HMACSHA224:
+		return ("hmac-sha224");
+	case DST_ALG_HMACSHA256:
+		return ("hmac-sha256");
+	case DST_ALG_HMACSHA384:
+		return ("hmac-sha384");
+	case DST_ALG_HMACSHA512:
+		return ("hmac-sha512");
+	default:
+		return ("unknown");
+	}
+}