1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/x509.h>
61 #include <openssl/asn1.h>
62 #include <openssl/dh.h>
63 #include <openssl/bn.h>
64 #include "asn1_locl.h"
65 #ifndef OPENSSL_NO_CMS
66 #include <openssl/cms.h>
69 extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth;
71 /* i2d/d2i like DH parameter functions which use the appropriate routine
72 * for PKCS#3 DH or X9.42 DH.
75 static DH * d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp, long length)
77 if (pkey->ameth == &dhx_asn1_meth)
78 return d2i_DHxparams(NULL, pp, length);
79 return d2i_DHparams(NULL, pp, length);
82 static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
84 if (pkey->ameth == &dhx_asn1_meth)
85 return i2d_DHxparams(a, pp);
86 return i2d_DHparams(a, pp);
89 static void int_dh_free(EVP_PKEY *pkey)
91 DH_free(pkey->pkey.dh);
94 static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
96 const unsigned char *p, *pm;
102 ASN1_INTEGER *public_key = NULL;
106 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
108 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
110 if (ptype != V_ASN1_SEQUENCE)
112 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
118 pmlen = pstr->length;
120 if (!(dh = d2i_dhp(pkey, &pm, pmlen)))
122 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
126 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, pklen)))
128 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
132 /* We have parameters now set public key */
133 if (!(dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
135 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
139 ASN1_INTEGER_free(public_key);
140 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
145 ASN1_INTEGER_free(public_key);
152 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
157 unsigned char *penc = NULL;
160 ASN1_INTEGER *pub_key = NULL;
164 str = ASN1_STRING_new();
165 str->length = i2d_dhp(pkey, dh, &str->data);
166 if (str->length <= 0)
168 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
172 ptype = V_ASN1_SEQUENCE;
174 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
178 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
180 ASN1_INTEGER_free(pub_key);
184 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
188 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
189 ptype, pval, penc, penclen))
196 ASN1_STRING_free(pval);
202 /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
203 * that the AlgorithmIdentifier contains the parameters, the private key
204 * is explcitly included and the pubkey must be recalculated.
207 static int dh_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
209 const unsigned char *p, *pm;
215 ASN1_INTEGER *privkey = NULL;
219 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
222 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
224 if (ptype != V_ASN1_SEQUENCE)
227 if (!(privkey=d2i_ASN1_INTEGER(NULL, &p, pklen)))
233 pmlen = pstr->length;
234 if (!(dh = d2i_dhp(pkey, &pm, pmlen)))
236 /* We have parameters now set private key */
237 if (!(dh->priv_key = ASN1_INTEGER_to_BN(privkey, NULL)))
239 DHerr(DH_F_DH_PRIV_DECODE,DH_R_BN_ERROR);
242 /* Calculate public key */
243 if (!DH_generate_key(dh))
246 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
248 ASN1_INTEGER_free(privkey);
253 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
259 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
261 ASN1_STRING *params = NULL;
262 ASN1_INTEGER *prkey = NULL;
263 unsigned char *dp = NULL;
266 params = ASN1_STRING_new();
270 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
274 params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data);
275 if (params->length <= 0)
277 DHerr(DH_F_DH_PRIV_ENCODE,ERR_R_MALLOC_FAILURE);
280 params->type = V_ASN1_SEQUENCE;
282 /* Get private key into integer */
283 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
287 DHerr(DH_F_DH_PRIV_ENCODE,DH_R_BN_ERROR);
291 dplen = i2d_ASN1_INTEGER(prkey, &dp);
293 ASN1_INTEGER_free(prkey);
295 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
296 V_ASN1_SEQUENCE, params, dp, dplen))
305 ASN1_STRING_free(params);
307 ASN1_INTEGER_free(prkey);
312 static void update_buflen(const BIGNUM *b, size_t *pbuflen)
317 if (*pbuflen < (i = (size_t)BN_num_bytes(b)))
321 static int dh_param_decode(EVP_PKEY *pkey,
322 const unsigned char **pder, int derlen)
325 if (!(dh = d2i_dhp(pkey, pder, derlen)))
327 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
330 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
334 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
336 return i2d_dhp(pkey, pkey->pkey.dh, pder);
339 static int do_dh_print(BIO *bp, const DH *x, int indent,
340 ASN1_PCTX *ctx, int ptype)
342 unsigned char *m=NULL;
343 int reason=ERR_R_BUF_LIB,ret=0;
346 const char *ktype = NULL;
348 BIGNUM *priv_key, *pub_key;
351 priv_key = x->priv_key;
356 pub_key = x->pub_key;
360 update_buflen(x->p, &buf_len);
364 reason = ERR_R_PASSED_NULL_PARAMETER;
368 update_buflen(x->g, &buf_len);
369 update_buflen(x->q, &buf_len);
370 update_buflen(x->j, &buf_len);
371 update_buflen(x->counter, &buf_len);
372 update_buflen(pub_key, &buf_len);
373 update_buflen(priv_key, &buf_len);
376 ktype = "DH Private-Key";
378 ktype = "DH Public-Key";
380 ktype = "DH Parameters";
382 m= OPENSSL_malloc(buf_len+10);
385 reason=ERR_R_MALLOC_FAILURE;
389 BIO_indent(bp, indent, 128);
390 if (BIO_printf(bp,"%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
394 if (!ASN1_bn_print(bp,"private-key:",priv_key,m,indent)) goto err;
395 if (!ASN1_bn_print(bp,"public-key:",pub_key,m,indent)) goto err;
397 if (!ASN1_bn_print(bp,"prime:",x->p,m,indent)) goto err;
398 if (!ASN1_bn_print(bp,"generator:",x->g,m,indent)) goto err;
399 if (x->q && !ASN1_bn_print(bp,"subgroup order:",x->q,m,indent)) goto err;
400 if (x->j && !ASN1_bn_print(bp,"subgroup factor:",x->j,m,indent))
405 BIO_indent(bp, indent, 128);
406 BIO_puts(bp, "seed:");
407 for (i=0; i < x->seedlen; i++)
411 if(BIO_puts(bp,"\n") <= 0
412 || !BIO_indent(bp,indent+4,128))
415 if (BIO_printf(bp,"%02x%s", x->seed[i],
416 ((i+1) == x->seedlen)?"":":") <= 0)
419 if (BIO_write(bp,"\n",1) <= 0) return(0);
421 if (x->counter && !ASN1_bn_print(bp,"counter:",x->counter,m,indent))
425 BIO_indent(bp, indent, 128);
426 if (BIO_printf(bp,"recommended-private-length: %d bits\n",
427 (int)x->length) <= 0) goto err;
435 DHerr(DH_F_DO_DH_PRINT,reason);
437 if (m != NULL) OPENSSL_free(m);
441 static int int_dh_size(const EVP_PKEY *pkey)
443 return(DH_size(pkey->pkey.dh));
446 static int dh_bits(const EVP_PKEY *pkey)
448 return BN_num_bits(pkey->pkey.dh->p);
451 static int dh_security_bits(const EVP_PKEY *pkey)
453 return DH_security_bits(pkey->pkey.dh);
456 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
458 if ( BN_cmp(a->pkey.dh->p,b->pkey.dh->p) ||
459 BN_cmp(a->pkey.dh->g,b->pkey.dh->g))
461 else if (a->ameth == &dhx_asn1_meth)
463 if (BN_cmp(a->pkey.dh->q,b->pkey.dh->q))
469 static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src)
486 static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
490 if (!int_dh_bn_cpy(&to->p, from->p))
492 if (!int_dh_bn_cpy(&to->g, from->g))
496 if (!int_dh_bn_cpy(&to->q, from->q))
498 if (!int_dh_bn_cpy(&to->j, from->j))
502 OPENSSL_free(to->seed);
508 to->seed = BUF_memdup(from->seed, from->seedlen);
511 to->seedlen = from->seedlen;
515 to->length = from->length;
520 DH *DHparams_dup(DH *dh)
526 if (!int_dh_param_copy(ret, dh, -1))
534 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
536 return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
537 from->ameth == &dhx_asn1_meth);
540 static int dh_missing_parameters(const EVP_PKEY *a)
542 if (!a->pkey.dh->p || !a->pkey.dh->g)
547 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
549 if (dh_cmp_parameters(a, b) == 0)
551 if (BN_cmp(b->pkey.dh->pub_key,a->pkey.dh->pub_key) != 0)
557 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
560 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
563 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
566 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
569 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
572 return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
575 int DHparams_print(BIO *bp, const DH *x)
577 return do_dh_print(bp, x, 4, NULL, 0);
580 #ifndef OPENSSL_NO_CMS
581 static int dh_cms_decrypt(CMS_RecipientInfo *ri);
582 static int dh_cms_encrypt(CMS_RecipientInfo *ri);
585 static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
589 #ifndef OPENSSL_NO_CMS
591 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
593 return dh_cms_decrypt(arg2);
595 return dh_cms_encrypt(arg2);
598 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
599 *(int *)arg2 = CMS_RECIPINFO_AGREE;
608 const EVP_PKEY_ASN1_METHOD dh_asn1_meth =
615 "OpenSSL PKCS#3 DH method",
632 dh_missing_parameters,
642 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth =
649 "OpenSSL X9.42 DH method",
666 dh_missing_parameters,
675 #ifndef OPENSSL_NO_CMS
677 static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
678 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
683 ASN1_INTEGER *public_key = NULL;
685 EVP_PKEY *pkpeer = NULL, *pk = NULL;
687 const unsigned char *p;
690 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
691 if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
693 /* Only absent parameters allowed in RFC XXXX */
694 if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
697 pk = EVP_PKEY_CTX_get0_pkey(pctx);
700 if (pk->type != EVP_PKEY_DHX)
702 /* Get parameters from parent key */
703 dhpeer = DHparams_dup(pk->pkey.dh);
704 /* We have parameters now set public key */
705 plen = ASN1_STRING_length(pubkey);
706 p = ASN1_STRING_data(pubkey);
710 if (!(public_key=d2i_ASN1_INTEGER(NULL, &p, plen)))
712 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR);
716 /* We have parameters now set public key */
717 if (!(dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)))
719 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR);
723 pkpeer = EVP_PKEY_new();
726 EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer);
728 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
732 ASN1_INTEGER_free(public_key);
734 EVP_PKEY_free(pkpeer);
740 static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
744 X509_ALGOR *alg, *kekalg = NULL;
745 ASN1_OCTET_STRING *ukm;
746 const unsigned char *p;
747 unsigned char *dukm = NULL;
750 const EVP_CIPHER *kekcipher;
751 EVP_CIPHER_CTX *kekctx;
753 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
756 /* For DH we only have one OID permissible. If ever any more get
757 * defined we will need something cleverer.
759 if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH)
761 DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR);
765 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0)
768 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
771 if (alg->parameter->type != V_ASN1_SEQUENCE)
774 p = alg->parameter->value.sequence->data;
775 plen = alg->parameter->value.sequence->length;
776 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
779 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
782 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
783 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
785 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
787 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
790 keylen = EVP_CIPHER_CTX_key_length(kekctx);
791 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
793 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
794 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
795 OBJ_nid2obj(EVP_CIPHER_type(kekcipher))) <= 0)
800 dukmlen = ASN1_STRING_length(ukm);
801 dukm = BUF_memdup(ASN1_STRING_data(ukm), dukmlen);
806 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
813 X509_ALGOR_free(kekalg);
819 static int dh_cms_decrypt(CMS_RecipientInfo *ri)
822 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
825 /* See if we need to set peer key */
826 if (!EVP_PKEY_CTX_get0_peerkey(pctx))
829 ASN1_BIT_STRING *pubkey;
830 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
835 if (!dh_cms_set_peerkey(pctx, alg, pubkey))
837 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR);
841 /* Set DH derivation parameters and initialise unwrap context */
842 if (!dh_cms_set_shared_info(pctx, ri))
844 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
850 static int dh_cms_encrypt(CMS_RecipientInfo *ri)
856 X509_ALGOR *talg, *wrap_alg = NULL;
858 ASN1_BIT_STRING *pubkey;
859 ASN1_STRING *wrap_str;
860 ASN1_OCTET_STRING *ukm;
861 unsigned char *penc = NULL, *dukm = NULL;
865 int kdf_type, wrap_nid;
866 const EVP_MD *kdf_md;
867 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
870 /* Get ephemeral key */
871 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
872 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
875 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
876 /* Is everything uninitialised? */
877 if (aoid == OBJ_nid2obj(NID_undef))
880 pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
885 penclen = i2d_ASN1_INTEGER(pubk, &penc);
886 ASN1_INTEGER_free(pubk);
889 ASN1_STRING_set0(pubkey, penc, penclen);
890 pubkey->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
891 pubkey->flags|=ASN1_STRING_FLAG_BITS_LEFT;
894 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
898 /* See if custom paraneters set */
899 kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
902 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
905 if (kdf_type == EVP_PKEY_DH_KDF_NONE)
907 kdf_type = EVP_PKEY_DH_KDF_X9_42;
908 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
911 else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
916 /* Only SHA1 supported */
918 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
921 else if (EVP_MD_type(kdf_md) != NID_sha1)
922 /* Unsupported digest */
925 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
929 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
930 wrap_nid = EVP_CIPHER_CTX_type(ctx);
931 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
933 keylen = EVP_CIPHER_CTX_key_length(ctx);
935 /* Package wrap algorithm in an AlgorithmIdentifier */
937 wrap_alg = X509_ALGOR_new();
940 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
941 wrap_alg->parameter = ASN1_TYPE_new();
942 if (!wrap_alg->parameter)
944 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
946 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef)
948 ASN1_TYPE_free(wrap_alg->parameter);
949 wrap_alg->parameter = NULL;
952 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
957 dukmlen = ASN1_STRING_length(ukm);
958 dukm = BUF_memdup(ASN1_STRING_data(ukm), dukmlen);
963 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
967 /* Now need to wrap encoding of wrap AlgorithmIdentifier into
968 * parameter of another AlgorithmIdentifier.
971 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
972 if (!penc || !penclen)
974 wrap_str = ASN1_STRING_new();
977 ASN1_STRING_set0(wrap_str, penc, penclen);
979 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
980 V_ASN1_SEQUENCE, wrap_str);
988 X509_ALGOR_free(wrap_alg);