Adding upstream version 1:9.16.44.upstream/1%9.16.44upstream

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

1 files changed, 815 insertions, 0 deletions

diff --git a/lib/dns/openssldh_link.c b/lib/dns/openssldh_link.c
new file mode 100644
index 0000000..f514931
--- /dev/null
+++ b/lib/dns/openssldh_link.c
@@ -0,0 +1,815 @@
+/*
+ * 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 <ctype.h>
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <openssl/opensslv.h>
+
+#include <isc/mem.h>
+#include <isc/safe.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <pk11/site.h>
+
+#include <dst/result.h>
+
+#include "dst_internal.h"
+#include "dst_openssl.h"
+#include "dst_parse.h"
+
+#define PRIME2 "02"
+
+#define PRIME768                                                               \
+	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E088"            \
+	"A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF25"   \
+	"F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A63A3620FFFFFFFFFFFFFFF" \
+	"F"
+
+#define PRIME1024                                                            \
+	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"           \
+	"8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B302B0A6DF2" \
+	"5F14374FE1356D6D51C245E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406" \
+	"B7EDEE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381FFFFFFFFFFFFFFFF"
+
+#define PRIME1536                                          \
+	"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \
+	"29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \
+	"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \
+	"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \
+	"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" \
+	"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" \
+	"83655D23DCA3AD961C62F356208552BB9ED529077096966D" \
+	"670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF"
+
+static BIGNUM *bn2 = NULL, *bn768 = NULL, *bn1024 = NULL, *bn1536 = NULL;
+
+#if !HAVE_DH_GET0_KEY
+/*
+ * DH_get0_key, DH_set0_key, DH_get0_pqg and DH_set0_pqg
+ * are from OpenSSL 1.1.0.
+ */
+static void
+DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key) {
+	if (pub_key != NULL) {
+		*pub_key = dh->pub_key;
+	}
+	if (priv_key != NULL) {
+		*priv_key = dh->priv_key;
+	}
+}
+
+static int
+DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key) {
+	if (pub_key != NULL) {
+		BN_free(dh->pub_key);
+		dh->pub_key = pub_key;
+	}
+
+	if (priv_key != NULL) {
+		BN_free(dh->priv_key);
+		dh->priv_key = priv_key;
+	}
+
+	return (1);
+}
+
+static void
+DH_get0_pqg(const DH *dh, const BIGNUM **p, const BIGNUM **q,
+	    const BIGNUM **g) {
+	if (p != NULL) {
+		*p = dh->p;
+	}
+	if (q != NULL) {
+		*q = dh->q;
+	}
+	if (g != NULL) {
+		*g = dh->g;
+	}
+}
+
+static int
+DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) {
+	/* If the fields p and g in d are NULL, the corresponding input
+	 * parameters MUST be non-NULL.  q may remain NULL.
+	 */
+	if ((dh->p == NULL && p == NULL) || (dh->g == NULL && g == NULL)) {
+		return (0);
+	}
+
+	if (p != NULL) {
+		BN_free(dh->p);
+		dh->p = p;
+	}
+	if (q != NULL) {
+		BN_free(dh->q);
+		dh->q = q;
+	}
+	if (g != NULL) {
+		BN_free(dh->g);
+		dh->g = g;
+	}
+
+	if (q != NULL) {
+		dh->length = BN_num_bits(q);
+	}
+
+	return (1);
+}
+
+#define DH_clear_flags(d, f) (d)->flags &= ~(f)
+
+#endif /* !HAVE_DH_GET0_KEY */
+
+static isc_result_t
+openssldh_computesecret(const dst_key_t *pub, const dst_key_t *priv,
+			isc_buffer_t *secret) {
+	DH *dhpub, *dhpriv;
+	const BIGNUM *pub_key = NULL;
+	int ret;
+	isc_region_t r;
+	unsigned int len;
+
+	REQUIRE(pub->keydata.dh != NULL);
+	REQUIRE(priv->keydata.dh != NULL);
+
+	dhpub = pub->keydata.dh;
+	dhpriv = priv->keydata.dh;
+
+	len = DH_size(dhpriv);
+	isc_buffer_availableregion(secret, &r);
+	if (r.length < len) {
+		return (ISC_R_NOSPACE);
+	}
+
+	DH_get0_key(dhpub, &pub_key, NULL);
+	ret = DH_compute_key(r.base, pub_key, dhpriv);
+	if (ret <= 0) {
+		return (dst__openssl_toresult2("DH_compute_key",
+					       DST_R_COMPUTESECRETFAILURE));
+	}
+	isc_buffer_add(secret, len);
+	return (ISC_R_SUCCESS);
+}
+
+static bool
+openssldh_compare(const dst_key_t *key1, const dst_key_t *key2) {
+	DH *dh1, *dh2;
+	const BIGNUM *pub_key1 = NULL, *pub_key2 = NULL;
+	const BIGNUM *priv_key1 = NULL, *priv_key2 = NULL;
+	const BIGNUM *p1 = NULL, *g1 = NULL, *p2 = NULL, *g2 = NULL;
+
+	dh1 = key1->keydata.dh;
+	dh2 = key2->keydata.dh;
+
+	if (dh1 == NULL && dh2 == NULL) {
+		return (true);
+	} else if (dh1 == NULL || dh2 == NULL) {
+		return (false);
+	}
+
+	DH_get0_key(dh1, &pub_key1, &priv_key1);
+	DH_get0_key(dh2, &pub_key2, &priv_key2);
+	DH_get0_pqg(dh1, &p1, NULL, &g1);
+	DH_get0_pqg(dh2, &p2, NULL, &g2);
+
+	if (BN_cmp(p1, p2) != 0 || BN_cmp(g1, g2) != 0 ||
+	    BN_cmp(pub_key1, pub_key2) != 0)
+	{
+		return (false);
+	}
+
+	if (priv_key1 != NULL || priv_key2 != NULL) {
+		if (priv_key1 == NULL || priv_key2 == NULL) {
+			return (false);
+		}
+		if (BN_cmp(priv_key1, priv_key2) != 0) {
+			return (false);
+		}
+	}
+	return (true);
+}
+
+static bool
+openssldh_paramcompare(const dst_key_t *key1, const dst_key_t *key2) {
+	DH *dh1, *dh2;
+	const BIGNUM *p1 = NULL, *g1 = NULL, *p2 = NULL, *g2 = NULL;
+
+	dh1 = key1->keydata.dh;
+	dh2 = key2->keydata.dh;
+
+	if (dh1 == NULL && dh2 == NULL) {
+		return (true);
+	} else if (dh1 == NULL || dh2 == NULL) {
+		return (false);
+	}
+
+	DH_get0_pqg(dh1, &p1, NULL, &g1);
+	DH_get0_pqg(dh2, &p2, NULL, &g2);
+
+	if (BN_cmp(p1, p2) != 0 || BN_cmp(g1, g2) != 0) {
+		return (false);
+	}
+	return (true);
+}
+
+static int
+progress_cb(int p, int n, BN_GENCB *cb) {
+	union {
+		void *dptr;
+		void (*fptr)(int);
+	} u;
+
+	UNUSED(n);
+
+	u.dptr = BN_GENCB_get_arg(cb);
+	if (u.fptr != NULL) {
+		u.fptr(p);
+	}
+	return (1);
+}
+
+static isc_result_t
+openssldh_generate(dst_key_t *key, int generator, void (*callback)(int)) {
+	DH *dh = NULL;
+	BN_GENCB *cb;
+#if !HAVE_BN_GENCB_NEW
+	BN_GENCB _cb;
+#endif /* !HAVE_BN_GENCB_NEW */
+	union {
+		void *dptr;
+		void (*fptr)(int);
+	} u;
+
+	if (generator == 0) {
+		if (key->key_size == 768 || key->key_size == 1024 ||
+		    key->key_size == 1536)
+		{
+			BIGNUM *p, *g;
+			dh = DH_new();
+			if (key->key_size == 768) {
+				p = BN_dup(bn768);
+			} else if (key->key_size == 1024) {
+				p = BN_dup(bn1024);
+			} else {
+				p = BN_dup(bn1536);
+			}
+			g = BN_dup(bn2);
+			if (dh == NULL || p == NULL || g == NULL) {
+				if (dh != NULL) {
+					DH_free(dh);
+				}
+				if (p != NULL) {
+					BN_free(p);
+				}
+				if (g != NULL) {
+					BN_free(g);
+				}
+				return (dst__openssl_toresult(ISC_R_NOMEMORY));
+			}
+			DH_set0_pqg(dh, p, NULL, g);
+		} else {
+			generator = 2;
+		}
+	}
+
+	if (generator != 0) {
+		dh = DH_new();
+		if (dh == NULL) {
+			return (dst__openssl_toresult(ISC_R_NOMEMORY));
+		}
+		cb = BN_GENCB_new();
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
+		if (cb == NULL) {
+			DH_free(dh);
+			return (dst__openssl_toresult(ISC_R_NOMEMORY));
+		}
+#endif /* if OPENSSL_VERSION_NUMBER >= 0x10100000L && \
+	* !defined(LIBRESSL_VERSION_NUMBER) */
+		if (callback == NULL) {
+			BN_GENCB_set_old(cb, NULL, NULL);
+		} else {
+			u.fptr = callback;
+			BN_GENCB_set(cb, progress_cb, u.dptr);
+		}
+
+		if (!DH_generate_parameters_ex(dh, key->key_size, generator,
+					       cb))
+		{
+			DH_free(dh);
+			BN_GENCB_free(cb);
+			return (dst__openssl_toresult2("DH_generate_parameters_"
+						       "ex",
+						       DST_R_OPENSSLFAILURE));
+		}
+		BN_GENCB_free(cb);
+		cb = NULL;
+	}
+
+	if (DH_generate_key(dh) == 0) {
+		DH_free(dh);
+		return (dst__openssl_toresult2("DH_generate_key",
+					       DST_R_OPENSSLFAILURE));
+	}
+	DH_clear_flags(dh, DH_FLAG_CACHE_MONT_P);
+	key->keydata.dh = dh;
+
+	return (ISC_R_SUCCESS);
+}
+
+static bool
+openssldh_isprivate(const dst_key_t *key) {
+	DH *dh = key->keydata.dh;
+	const BIGNUM *priv_key = NULL;
+
+	DH_get0_key(dh, NULL, &priv_key);
+	return (dh != NULL && priv_key != NULL);
+}
+
+static void
+openssldh_destroy(dst_key_t *key) {
+	DH *dh = key->keydata.dh;
+
+	if (dh == NULL) {
+		return;
+	}
+
+	DH_free(dh);
+	key->keydata.dh = NULL;
+}
+
+static void
+uint16_toregion(uint16_t val, isc_region_t *region) {
+	*region->base = (val & 0xff00) >> 8;
+	isc_region_consume(region, 1);
+	*region->base = (val & 0x00ff);
+	isc_region_consume(region, 1);
+}
+
+static uint16_t
+uint16_fromregion(isc_region_t *region) {
+	uint16_t val;
+	unsigned char *cp = region->base;
+
+	val = ((unsigned int)(cp[0])) << 8;
+	val |= ((unsigned int)(cp[1]));
+
+	isc_region_consume(region, 2);
+
+	return (val);
+}
+
+static isc_result_t
+openssldh_todns(const dst_key_t *key, isc_buffer_t *data) {
+	DH *dh;
+	const BIGNUM *pub_key = NULL, *p = NULL, *g = NULL;
+	isc_region_t r;
+	uint16_t dnslen, plen, glen, publen;
+
+	REQUIRE(key->keydata.dh != NULL);
+
+	dh = key->keydata.dh;
+
+	isc_buffer_availableregion(data, &r);
+
+	DH_get0_pqg(dh, &p, NULL, &g);
+	if (BN_cmp(g, bn2) == 0 &&
+	    (BN_cmp(p, bn768) == 0 || BN_cmp(p, bn1024) == 0 ||
+	     BN_cmp(p, bn1536) == 0))
+	{
+		plen = 1;
+		glen = 0;
+	} else {
+		plen = BN_num_bytes(p);
+		glen = BN_num_bytes(g);
+	}
+	DH_get0_key(dh, &pub_key, NULL);
+	publen = BN_num_bytes(pub_key);
+	dnslen = plen + glen + publen + 6;
+	if (r.length < (unsigned int)dnslen) {
+		return (ISC_R_NOSPACE);
+	}
+
+	uint16_toregion(plen, &r);
+	if (plen == 1) {
+		if (BN_cmp(p, bn768) == 0) {
+			*r.base = 1;
+		} else if (BN_cmp(p, bn1024) == 0) {
+			*r.base = 2;
+		} else {
+			*r.base = 3;
+		}
+	} else {
+		BN_bn2bin(p, r.base);
+	}
+	isc_region_consume(&r, plen);
+
+	uint16_toregion(glen, &r);
+	if (glen > 0) {
+		BN_bn2bin(g, r.base);
+	}
+	isc_region_consume(&r, glen);
+
+	uint16_toregion(publen, &r);
+	BN_bn2bin(pub_key, r.base);
+	isc_region_consume(&r, publen);
+
+	isc_buffer_add(data, dnslen);
+
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+openssldh_fromdns(dst_key_t *key, isc_buffer_t *data) {
+	DH *dh;
+	BIGNUM *pub_key = NULL, *p = NULL, *g = NULL;
+	isc_region_t r;
+	uint16_t plen, glen, publen;
+	int special = 0;
+
+	isc_buffer_remainingregion(data, &r);
+	if (r.length == 0) {
+		return (ISC_R_SUCCESS);
+	}
+
+	dh = DH_new();
+	if (dh == NULL) {
+		return (dst__openssl_toresult(ISC_R_NOMEMORY));
+	}
+	DH_clear_flags(dh, DH_FLAG_CACHE_MONT_P);
+
+	/*
+	 * Read the prime length.  1 & 2 are table entries, > 16 means a
+	 * prime follows, otherwise an error.
+	 */
+	if (r.length < 2) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	plen = uint16_fromregion(&r);
+	if (plen < 16 && plen != 1 && plen != 2) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	if (r.length < plen) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	if (plen == 1 || plen == 2) {
+		if (plen == 1) {
+			special = *r.base;
+			isc_region_consume(&r, 1);
+		} else {
+			special = uint16_fromregion(&r);
+		}
+		switch (special) {
+		case 1:
+			p = BN_dup(bn768);
+			break;
+		case 2:
+			p = BN_dup(bn1024);
+			break;
+		case 3:
+			p = BN_dup(bn1536);
+			break;
+		default:
+			DH_free(dh);
+			return (DST_R_INVALIDPUBLICKEY);
+		}
+	} else {
+		p = BN_bin2bn(r.base, plen, NULL);
+		isc_region_consume(&r, plen);
+	}
+
+	/*
+	 * Read the generator length.  This should be 0 if the prime was
+	 * special, but it might not be.  If it's 0 and the prime is not
+	 * special, we have a problem.
+	 */
+	if (r.length < 2) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	glen = uint16_fromregion(&r);
+	if (r.length < glen) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	if (special != 0) {
+		if (glen == 0) {
+			g = BN_dup(bn2);
+		} else {
+			g = BN_bin2bn(r.base, glen, NULL);
+			if (g != NULL && BN_cmp(g, bn2) != 0) {
+				DH_free(dh);
+				BN_free(g);
+				return (DST_R_INVALIDPUBLICKEY);
+			}
+		}
+	} else {
+		if (glen == 0) {
+			DH_free(dh);
+			return (DST_R_INVALIDPUBLICKEY);
+		}
+		g = BN_bin2bn(r.base, glen, NULL);
+	}
+	isc_region_consume(&r, glen);
+
+	if (p == NULL || g == NULL) {
+		DH_free(dh);
+		if (p != NULL) {
+			BN_free(p);
+		}
+		if (g != NULL) {
+			BN_free(g);
+		}
+		return (dst__openssl_toresult(ISC_R_NOMEMORY));
+	}
+	DH_set0_pqg(dh, p, NULL, g);
+
+	if (r.length < 2) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	publen = uint16_fromregion(&r);
+	if (r.length < publen) {
+		DH_free(dh);
+		return (DST_R_INVALIDPUBLICKEY);
+	}
+	pub_key = BN_bin2bn(r.base, publen, NULL);
+	if (pub_key == NULL) {
+		DH_free(dh);
+		return (dst__openssl_toresult(ISC_R_NOMEMORY));
+	}
+#if (LIBRESSL_VERSION_NUMBER >= 0x2070000fL) && \
+	(LIBRESSL_VERSION_NUMBER <= 0x2070200fL)
+	/*
+	 * LibreSSL << 2.7.3 DH_get0_key requires priv_key to be set when
+	 * DH structure is empty, hence we cannot use DH_get0_key().
+	 */
+	dh->pub_key = pub_key;
+#else  /* LIBRESSL_VERSION_NUMBER */
+	DH_set0_key(dh, pub_key, NULL);
+#endif /* LIBRESSL_VERSION_NUMBER */
+	isc_region_consume(&r, publen);
+
+	key->key_size = BN_num_bits(p);
+
+	isc_buffer_forward(data, plen + glen + publen + 6);
+
+	key->keydata.dh = dh;
+
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+openssldh_tofile(const dst_key_t *key, const char *directory) {
+	int i;
+	DH *dh;
+	const BIGNUM *pub_key = NULL, *priv_key = NULL, *p = NULL, *g = NULL;
+	dst_private_t priv;
+	unsigned char *bufs[4];
+	isc_result_t result;
+
+	if (key->keydata.dh == NULL) {
+		return (DST_R_NULLKEY);
+	}
+
+	if (key->external) {
+		return (DST_R_EXTERNALKEY);
+	}
+
+	dh = key->keydata.dh;
+	DH_get0_key(dh, &pub_key, &priv_key);
+	DH_get0_pqg(dh, &p, NULL, &g);
+
+	memset(bufs, 0, sizeof(bufs));
+	for (i = 0; i < 4; i++) {
+		bufs[i] = isc_mem_get(key->mctx, BN_num_bytes(p));
+	}
+
+	i = 0;
+
+	priv.elements[i].tag = TAG_DH_PRIME;
+	priv.elements[i].length = BN_num_bytes(p);
+	BN_bn2bin(p, bufs[i]);
+	priv.elements[i].data = bufs[i];
+	i++;
+
+	priv.elements[i].tag = TAG_DH_GENERATOR;
+	priv.elements[i].length = BN_num_bytes(g);
+	BN_bn2bin(g, bufs[i]);
+	priv.elements[i].data = bufs[i];
+	i++;
+
+	priv.elements[i].tag = TAG_DH_PRIVATE;
+	priv.elements[i].length = BN_num_bytes(priv_key);
+	BN_bn2bin(priv_key, bufs[i]);
+	priv.elements[i].data = bufs[i];
+	i++;
+
+	priv.elements[i].tag = TAG_DH_PUBLIC;
+	priv.elements[i].length = BN_num_bytes(pub_key);
+	BN_bn2bin(pub_key, bufs[i]);
+	priv.elements[i].data = bufs[i];
+	i++;
+
+	priv.nelements = i;
+	result = dst__privstruct_writefile(key, &priv, directory);
+
+	for (i = 0; i < 4; i++) {
+		if (bufs[i] == NULL) {
+			break;
+		}
+		isc_mem_put(key->mctx, bufs[i], BN_num_bytes(p));
+	}
+	return (result);
+}
+
+static isc_result_t
+openssldh_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
+	dst_private_t priv;
+	isc_result_t ret;
+	int i;
+	DH *dh = NULL;
+	BIGNUM *pub_key = NULL, *priv_key = NULL, *p = NULL, *g = NULL;
+	isc_mem_t *mctx;
+#define DST_RET(a)        \
+	{                 \
+		ret = a;  \
+		goto err; \
+	}
+
+	UNUSED(pub);
+	mctx = key->mctx;
+
+	/* read private key file */
+	ret = dst__privstruct_parse(key, DST_ALG_DH, lexer, mctx, &priv);
+	if (ret != ISC_R_SUCCESS) {
+		return (ret);
+	}
+
+	if (key->external) {
+		DST_RET(DST_R_EXTERNALKEY);
+	}
+
+	dh = DH_new();
+	if (dh == NULL) {
+		DST_RET(ISC_R_NOMEMORY);
+	}
+	DH_clear_flags(dh, DH_FLAG_CACHE_MONT_P);
+	key->keydata.dh = dh;
+
+	for (i = 0; i < priv.nelements; i++) {
+		BIGNUM *bn;
+		bn = BN_bin2bn(priv.elements[i].data, priv.elements[i].length,
+			       NULL);
+		if (bn == NULL) {
+			DST_RET(ISC_R_NOMEMORY);
+		}
+
+		switch (priv.elements[i].tag) {
+		case TAG_DH_PRIME:
+			p = bn;
+			break;
+		case TAG_DH_GENERATOR:
+			g = bn;
+			break;
+		case TAG_DH_PRIVATE:
+			priv_key = bn;
+			break;
+		case TAG_DH_PUBLIC:
+			pub_key = bn;
+			break;
+		}
+	}
+	dst__privstruct_free(&priv, mctx);
+	DH_set0_key(dh, pub_key, priv_key);
+	DH_set0_pqg(dh, p, NULL, g);
+
+	key->key_size = BN_num_bits(p);
+	return (ISC_R_SUCCESS);
+
+err:
+	if (p != NULL) {
+		BN_free(p);
+	}
+	if (g != NULL) {
+		BN_free(g);
+	}
+	if (pub_key != NULL) {
+		BN_free(pub_key);
+	}
+	if (priv_key != NULL) {
+		BN_free(priv_key);
+	}
+	openssldh_destroy(key);
+	dst__privstruct_free(&priv, mctx);
+	isc_safe_memwipe(&priv, sizeof(priv));
+	return (ret);
+}
+
+static void
+openssldh_cleanup(void) {
+	BN_free(bn2);
+	bn2 = NULL;
+
+	BN_free(bn768);
+	bn768 = NULL;
+
+	BN_free(bn1024);
+	bn1024 = NULL;
+
+	BN_free(bn1536);
+	bn1536 = NULL;
+}
+
+static dst_func_t openssldh_functions = {
+	NULL, /*%< createctx */
+	NULL, /*%< createctx2 */
+	NULL, /*%< destroyctx */
+	NULL, /*%< adddata */
+	NULL, /*%< openssldh_sign */
+	NULL, /*%< openssldh_verify */
+	NULL, /*%< openssldh_verify2 */
+	openssldh_computesecret,
+	openssldh_compare,
+	openssldh_paramcompare,
+	openssldh_generate,
+	openssldh_isprivate,
+	openssldh_destroy,
+	openssldh_todns,
+	openssldh_fromdns,
+	openssldh_tofile,
+	openssldh_parse,
+	openssldh_cleanup,
+	NULL, /*%< fromlabel */
+	NULL, /*%< dump */
+	NULL, /*%< restore */
+};
+
+isc_result_t
+dst__openssldh_init(dst_func_t **funcp) {
+	REQUIRE(funcp != NULL);
+	if (*funcp == NULL) {
+		if (BN_hex2bn(&bn2, PRIME2) == 0 || bn2 == NULL) {
+			goto cleanup;
+		}
+		if (BN_hex2bn(&bn768, PRIME768) == 0 || bn768 == NULL) {
+			goto cleanup;
+		}
+		if (BN_hex2bn(&bn1024, PRIME1024) == 0 || bn1024 == NULL) {
+			goto cleanup;
+		}
+		if (BN_hex2bn(&bn1536, PRIME1536) == 0 || bn1536 == NULL) {
+			goto cleanup;
+		}
+		*funcp = &openssldh_functions;
+	}
+	return (ISC_R_SUCCESS);
+
+cleanup:
+	if (bn2 != NULL) {
+		BN_free(bn2);
+	}
+	if (bn768 != NULL) {
+		BN_free(bn768);
+	}
+	if (bn1024 != NULL) {
+		BN_free(bn1024);
+	}
+	if (bn1536 != NULL) {
+		BN_free(bn1536);
+	}
+	return (ISC_R_NOMEMORY);
+}