2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * DH low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
17 #include "internal/cryptlib.h"
18 #include <openssl/x509.h>
19 #include <openssl/asn1.h>
21 #include <openssl/bn.h>
22 #include "crypto/asn1.h"
23 #include "crypto/dh.h"
24 #include "crypto/evp.h"
25 #include <openssl/cms.h>
26 #include <openssl/core_names.h>
27 #include "openssl/param_build.h"
28 #include "internal/ffc.h"
31 * i2d/d2i like DH parameter functions which use the appropriate routine for
32 * PKCS#3 DH or X9.42 DH.
35 static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp,
38 if (pkey->ameth == &dhx_asn1_meth)
39 return d2i_DHxparams(NULL, pp, length);
40 return d2i_DHparams(NULL, pp, length);
43 static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
45 if (pkey->ameth == &dhx_asn1_meth)
46 return i2d_DHxparams(a, pp);
47 return i2d_DHparams(a, pp);
50 static void int_dh_free(EVP_PKEY *pkey)
52 DH_free(pkey->pkey.dh);
55 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
57 const unsigned char *p, *pm;
61 const ASN1_STRING *pstr;
63 ASN1_INTEGER *public_key = NULL;
67 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
69 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
71 if (ptype != V_ASN1_SEQUENCE) {
72 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
80 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
81 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
85 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
86 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
90 /* We have parameters now set public key */
91 if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
92 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
96 ASN1_INTEGER_free(public_key);
97 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
101 ASN1_INTEGER_free(public_key);
107 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
111 unsigned char *penc = NULL;
114 ASN1_INTEGER *pub_key = NULL;
118 str = ASN1_STRING_new();
120 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
123 str->length = i2d_dhp(pkey, dh, &str->data);
124 if (str->length <= 0) {
125 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
128 ptype = V_ASN1_SEQUENCE;
130 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
134 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
136 ASN1_INTEGER_free(pub_key);
139 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
143 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
144 ptype, str, penc, penclen))
149 ASN1_STRING_free(str);
155 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
156 * the AlgorithmIdentifier contains the parameters, the private key is
157 * explicitly included and the pubkey must be recalculated.
160 static int dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
162 const unsigned char *p, *pm;
166 const ASN1_STRING *pstr;
167 const X509_ALGOR *palg;
168 ASN1_INTEGER *privkey = NULL;
171 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
174 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
176 if (ptype != V_ASN1_SEQUENCE)
178 if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
183 pmlen = pstr->length;
184 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL)
187 /* We have parameters now set private key */
188 if ((dh->priv_key = BN_secure_new()) == NULL
189 || !ASN1_INTEGER_to_BN(privkey, dh->priv_key)) {
190 DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR);
193 /* Calculate public key, increments dirty_cnt */
194 if (!DH_generate_key(dh))
197 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
199 ASN1_STRING_clear_free(privkey);
204 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
207 ASN1_STRING_clear_free(privkey);
211 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
213 ASN1_STRING *params = NULL;
214 ASN1_INTEGER *prkey = NULL;
215 unsigned char *dp = NULL;
218 params = ASN1_STRING_new();
220 if (params == NULL) {
221 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
225 params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data);
226 if (params->length <= 0) {
227 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
230 params->type = V_ASN1_SEQUENCE;
232 /* Get private key into integer */
233 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
236 DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR);
240 dplen = i2d_ASN1_INTEGER(prkey, &dp);
242 ASN1_STRING_clear_free(prkey);
245 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
246 V_ASN1_SEQUENCE, params, dp, dplen))
253 ASN1_STRING_free(params);
254 ASN1_STRING_clear_free(prkey);
258 static int dh_param_decode(EVP_PKEY *pkey,
259 const unsigned char **pder, int derlen)
263 if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL) {
264 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
268 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
272 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
274 return i2d_dhp(pkey, pkey->pkey.dh, pder);
277 static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype)
279 int reason = ERR_R_BUF_LIB;
280 const char *ktype = NULL;
281 BIGNUM *priv_key, *pub_key;
284 priv_key = x->priv_key;
289 pub_key = x->pub_key;
293 if (x->params.p == NULL || (ptype == 2 && priv_key == NULL)
294 || (ptype > 0 && pub_key == NULL)) {
295 reason = ERR_R_PASSED_NULL_PARAMETER;
300 ktype = "DH Private-Key";
302 ktype = "DH Public-Key";
304 ktype = "DH Parameters";
306 if (!BIO_indent(bp, indent, 128)
307 || BIO_printf(bp, "%s: (%d bit)\n", ktype, DH_bits(x)) <= 0)
311 if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
313 if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
316 if (!ffc_params_print(bp, &x->params, indent))
319 if (x->length != 0) {
320 if (!BIO_indent(bp, indent, 128)
321 || BIO_printf(bp, "recommended-private-length: %d bits\n",
322 (int)x->length) <= 0)
329 DHerr(DH_F_DO_DH_PRINT, reason);
333 static int int_dh_size(const EVP_PKEY *pkey)
335 return DH_size(pkey->pkey.dh);
338 static int dh_bits(const EVP_PKEY *pkey)
340 return DH_bits(pkey->pkey.dh);
343 static int dh_security_bits(const EVP_PKEY *pkey)
345 return DH_security_bits(pkey->pkey.dh);
348 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
350 return ffc_params_cmp(&a->pkey.dh->params, &a->pkey.dh->params,
351 a->ameth != &dhx_asn1_meth);
354 static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
357 is_x942 = (from->params.q != NULL);
358 if (!ffc_params_copy(&to->params, &from->params))
361 to->length = from->length;
366 DH *DHparams_dup(const DH *dh)
372 if (!int_dh_param_copy(ret, dh, -1)) {
379 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
381 if (to->pkey.dh == NULL) {
382 to->pkey.dh = DH_new();
383 if (to->pkey.dh == NULL)
386 return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
387 from->ameth == &dhx_asn1_meth);
390 static int dh_missing_parameters(const EVP_PKEY *a)
392 return a->pkey.dh == NULL
393 || a->pkey.dh->params.p == NULL
394 || a->pkey.dh->params.g == NULL;
397 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
399 if (dh_cmp_parameters(a, b) == 0)
401 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
407 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
410 return do_dh_print(bp, pkey->pkey.dh, indent, 0);
413 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
416 return do_dh_print(bp, pkey->pkey.dh, indent, 1);
419 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
422 return do_dh_print(bp, pkey->pkey.dh, indent, 2);
425 int DHparams_print(BIO *bp, const DH *x)
427 return do_dh_print(bp, x, 4, 0);
430 #ifndef OPENSSL_NO_CMS
431 static int dh_cms_decrypt(CMS_RecipientInfo *ri);
432 static int dh_cms_encrypt(CMS_RecipientInfo *ri);
435 static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
438 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
439 return dh_buf2key(EVP_PKEY_get0_DH(pkey), arg2, arg1);
440 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
441 return dh_key2buf(EVP_PKEY_get0_DH(pkey), arg2);
447 static int dhx_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
450 #ifndef OPENSSL_NO_CMS
452 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
454 return dh_cms_decrypt(arg2);
456 return dh_cms_encrypt(arg2);
459 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
460 *(int *)arg2 = CMS_RECIPINFO_AGREE;
469 static int dh_pkey_public_check(const EVP_PKEY *pkey)
471 DH *dh = pkey->pkey.dh;
473 if (dh->pub_key == NULL) {
474 DHerr(DH_F_DH_PKEY_PUBLIC_CHECK, DH_R_MISSING_PUBKEY);
478 return DH_check_pub_key_ex(dh, dh->pub_key);
481 static int dh_pkey_param_check(const EVP_PKEY *pkey)
483 DH *dh = pkey->pkey.dh;
485 return DH_check_ex(dh);
488 static size_t dh_pkey_dirty_cnt(const EVP_PKEY *pkey)
490 return pkey->pkey.dh->dirty_cnt;
493 static int dh_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
494 EVP_KEYMGMT *to_keymgmt, OPENSSL_CTX *libctx,
497 DH *dh = from->pkey.dh;
498 OSSL_PARAM_BLD *tmpl;
499 const BIGNUM *p = DH_get0_p(dh), *g = DH_get0_g(dh), *q = DH_get0_q(dh);
500 const BIGNUM *pub_key = DH_get0_pub_key(dh);
501 const BIGNUM *priv_key = DH_get0_priv_key(dh);
502 OSSL_PARAM *params = NULL;
507 * If the DH method is foreign, then we can't be sure of anything, and
508 * can therefore not export or pretend to export.
510 if (dh_get_method(dh) != DH_OpenSSL())
513 if (p == NULL || g == NULL)
516 tmpl = OSSL_PARAM_BLD_new();
519 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
520 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
523 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q))
526 selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
527 if (pub_key != NULL) {
528 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
530 selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
532 if (priv_key != NULL) {
533 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
536 selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
539 if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
542 /* We export, the provider imports */
543 rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
545 OSSL_PARAM_BLD_free_params(params);
547 OSSL_PARAM_BLD_free(tmpl);
551 static int dh_pkey_import_from(const OSSL_PARAM params[], void *key)
553 EVP_PKEY *pkey = key;
557 ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
561 if (!ffc_fromdata(dh_get0_params(dh), params)
562 || !dh_key_fromdata(dh, params)
563 || !EVP_PKEY_assign_DH(pkey, dh)) {
570 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
576 "OpenSSL PKCS#3 DH method",
593 dh_missing_parameters,
605 dh_pkey_public_check,
615 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = {
621 "OpenSSL X9.42 DH method",
638 dh_missing_parameters,
650 dh_pkey_public_check,
654 #ifndef OPENSSL_NO_CMS
656 static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
657 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
659 const ASN1_OBJECT *aoid;
662 ASN1_INTEGER *public_key = NULL;
664 EVP_PKEY *pkpeer = NULL, *pk = NULL;
666 const unsigned char *p;
669 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
670 if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
672 /* Only absent parameters allowed in RFC XXXX */
673 if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
676 pk = EVP_PKEY_CTX_get0_pkey(pctx);
679 if (pk->type != EVP_PKEY_DHX)
681 /* Get parameters from parent key */
682 dhpeer = DHparams_dup(pk->pkey.dh);
683 /* We have parameters now set public key */
684 plen = ASN1_STRING_length(pubkey);
685 p = ASN1_STRING_get0_data(pubkey);
686 if (p == NULL || plen == 0)
689 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, plen)) == NULL) {
690 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR);
694 /* We have parameters now set public key */
695 if ((dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
696 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR);
700 pkpeer = EVP_PKEY_new();
703 EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer);
705 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
708 ASN1_INTEGER_free(public_key);
709 EVP_PKEY_free(pkpeer);
714 static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
718 X509_ALGOR *alg, *kekalg = NULL;
719 ASN1_OCTET_STRING *ukm;
720 const unsigned char *p;
721 unsigned char *dukm = NULL;
724 const EVP_CIPHER *kekcipher;
725 EVP_CIPHER_CTX *kekctx;
727 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
731 * For DH we only have one OID permissible. If ever any more get defined
732 * we will need something cleverer.
734 if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) {
735 DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR);
739 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0)
742 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
745 if (alg->parameter->type != V_ASN1_SEQUENCE)
748 p = alg->parameter->value.sequence->data;
749 plen = alg->parameter->value.sequence->length;
750 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
753 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
756 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
757 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
759 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
761 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
764 keylen = EVP_CIPHER_CTX_key_length(kekctx);
765 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
767 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
768 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
769 OBJ_nid2obj(EVP_CIPHER_type(kekcipher)))
774 dukmlen = ASN1_STRING_length(ukm);
775 dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
780 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
786 X509_ALGOR_free(kekalg);
791 static int dh_cms_decrypt(CMS_RecipientInfo *ri)
795 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
799 /* See if we need to set peer key */
800 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
802 ASN1_BIT_STRING *pubkey;
803 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
808 if (!dh_cms_set_peerkey(pctx, alg, pubkey)) {
809 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR);
813 /* Set DH derivation parameters and initialise unwrap context */
814 if (!dh_cms_set_shared_info(pctx, ri)) {
815 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
821 static int dh_cms_encrypt(CMS_RecipientInfo *ri)
827 X509_ALGOR *talg, *wrap_alg = NULL;
828 const ASN1_OBJECT *aoid;
829 ASN1_BIT_STRING *pubkey;
830 ASN1_STRING *wrap_str;
831 ASN1_OCTET_STRING *ukm;
832 unsigned char *penc = NULL, *dukm = NULL;
836 int kdf_type, wrap_nid;
837 const EVP_MD *kdf_md;
839 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
842 /* Get ephemeral key */
843 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
844 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
847 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
848 /* Is everything uninitialised? */
849 if (aoid == OBJ_nid2obj(NID_undef)) {
850 ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
856 penclen = i2d_ASN1_INTEGER(pubk, &penc);
857 ASN1_INTEGER_free(pubk);
860 ASN1_STRING_set0(pubkey, penc, penclen);
861 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
862 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
865 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
869 /* See if custom parameters set */
870 kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
873 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
876 if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
877 kdf_type = EVP_PKEY_DH_KDF_X9_42;
878 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
880 } else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
883 if (kdf_md == NULL) {
884 /* Only SHA1 supported */
886 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
888 } else if (EVP_MD_type(kdf_md) != NID_sha1)
889 /* Unsupported digest */
892 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
896 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
897 wrap_nid = EVP_CIPHER_CTX_type(ctx);
898 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
900 keylen = EVP_CIPHER_CTX_key_length(ctx);
902 /* Package wrap algorithm in an AlgorithmIdentifier */
904 wrap_alg = X509_ALGOR_new();
905 if (wrap_alg == NULL)
907 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
908 wrap_alg->parameter = ASN1_TYPE_new();
909 if (wrap_alg->parameter == NULL)
911 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
913 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
914 ASN1_TYPE_free(wrap_alg->parameter);
915 wrap_alg->parameter = NULL;
918 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
922 dukmlen = ASN1_STRING_length(ukm);
923 dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
928 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
933 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
934 * of another AlgorithmIdentifier.
937 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
938 if (penc == NULL || penclen == 0)
940 wrap_str = ASN1_STRING_new();
941 if (wrap_str == NULL)
943 ASN1_STRING_set0(wrap_str, penc, penclen);
945 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
946 V_ASN1_SEQUENCE, wrap_str);
952 X509_ALGOR_free(wrap_alg);