2 * Copyright 2006-2020 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,
39 int is_dhx = (pkey->ameth == &dhx_asn1_meth);
42 dh = d2i_DHxparams(NULL, pp, length);
44 dh = d2i_DHparams(NULL, pp, length);
47 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
48 DH_set_flags(dh, is_dhx ? DH_FLAG_TYPE_DHX : DH_FLAG_TYPE_DH);
53 static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
55 if (pkey->ameth == &dhx_asn1_meth)
56 return i2d_DHxparams(a, pp);
57 return i2d_DHparams(a, pp);
60 static void int_dh_free(EVP_PKEY *pkey)
62 DH_free(pkey->pkey.dh);
65 static int dh_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
67 const unsigned char *p, *pm;
71 const ASN1_STRING *pstr;
73 ASN1_INTEGER *public_key = NULL;
77 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
79 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
81 if (ptype != V_ASN1_SEQUENCE) {
82 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
90 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
91 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
95 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
96 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
100 /* We have parameters now set public key */
101 if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
102 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
106 ASN1_INTEGER_free(public_key);
107 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
111 ASN1_INTEGER_free(public_key);
116 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
120 unsigned char *penc = NULL;
123 ASN1_INTEGER *pub_key = NULL;
127 str = ASN1_STRING_new();
129 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
132 str->length = i2d_dhp(pkey, dh, &str->data);
133 if (str->length <= 0) {
134 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
137 ptype = V_ASN1_SEQUENCE;
139 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
143 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
145 ASN1_INTEGER_free(pub_key);
148 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
152 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
153 ptype, str, penc, penclen))
158 ASN1_STRING_free(str);
164 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
165 * the AlgorithmIdentifier contains the parameters, the private key is
166 * explicitly included and the pubkey must be recalculated.
169 static int dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
171 const unsigned char *p, *pm;
175 const ASN1_STRING *pstr;
176 const X509_ALGOR *palg;
177 ASN1_INTEGER *privkey = NULL;
180 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
183 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
185 if (ptype != V_ASN1_SEQUENCE)
187 if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
192 pmlen = pstr->length;
193 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL)
196 /* We have parameters now set private key */
197 if ((dh->priv_key = BN_secure_new()) == NULL
198 || !ASN1_INTEGER_to_BN(privkey, dh->priv_key)) {
199 DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR);
202 /* Calculate public key, increments dirty_cnt */
203 if (!DH_generate_key(dh))
206 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
208 ASN1_STRING_clear_free(privkey);
213 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
216 ASN1_STRING_clear_free(privkey);
220 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
222 ASN1_STRING *params = NULL;
223 ASN1_INTEGER *prkey = NULL;
224 unsigned char *dp = NULL;
227 params = ASN1_STRING_new();
229 if (params == NULL) {
230 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
234 params->length = i2d_dhp(pkey, pkey->pkey.dh, ¶ms->data);
235 if (params->length <= 0) {
236 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
239 params->type = V_ASN1_SEQUENCE;
241 /* Get private key into integer */
242 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
245 DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR);
249 dplen = i2d_ASN1_INTEGER(prkey, &dp);
251 ASN1_STRING_clear_free(prkey);
254 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
255 V_ASN1_SEQUENCE, params, dp, dplen))
262 ASN1_STRING_free(params);
263 ASN1_STRING_clear_free(prkey);
267 static int dh_param_decode(EVP_PKEY *pkey,
268 const unsigned char **pder, int derlen)
272 if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL) {
273 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
277 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
281 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
283 return i2d_dhp(pkey, pkey->pkey.dh, pder);
286 static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype)
288 int reason = ERR_R_BUF_LIB;
289 const char *ktype = NULL;
290 BIGNUM *priv_key, *pub_key;
293 priv_key = x->priv_key;
298 pub_key = x->pub_key;
302 if (x->params.p == NULL || (ptype == 2 && priv_key == NULL)
303 || (ptype > 0 && pub_key == NULL)) {
304 reason = ERR_R_PASSED_NULL_PARAMETER;
309 ktype = "DH Private-Key";
311 ktype = "DH Public-Key";
313 ktype = "DH Parameters";
315 if (!BIO_indent(bp, indent, 128)
316 || BIO_printf(bp, "%s: (%d bit)\n", ktype, DH_bits(x)) <= 0)
320 if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
322 if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
325 if (!ffc_params_print(bp, &x->params, indent))
328 if (x->length != 0) {
329 if (!BIO_indent(bp, indent, 128)
330 || BIO_printf(bp, "recommended-private-length: %d bits\n",
331 (int)x->length) <= 0)
338 DHerr(DH_F_DO_DH_PRINT, reason);
342 static int int_dh_size(const EVP_PKEY *pkey)
344 return DH_size(pkey->pkey.dh);
347 static int dh_bits(const EVP_PKEY *pkey)
349 return DH_bits(pkey->pkey.dh);
352 static int dh_security_bits(const EVP_PKEY *pkey)
354 return DH_security_bits(pkey->pkey.dh);
357 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
359 return ffc_params_cmp(&a->pkey.dh->params, &a->pkey.dh->params,
360 a->ameth != &dhx_asn1_meth);
363 static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
366 is_x942 = (from->params.q != NULL);
367 if (!ffc_params_copy(&to->params, &from->params))
370 to->length = from->length;
375 DH *DHparams_dup(const DH *dh)
381 if (!int_dh_param_copy(ret, dh, -1)) {
388 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
390 if (to->pkey.dh == NULL) {
391 to->pkey.dh = DH_new();
392 if (to->pkey.dh == NULL)
395 return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
396 from->ameth == &dhx_asn1_meth);
399 static int dh_missing_parameters(const EVP_PKEY *a)
401 return a->pkey.dh == NULL
402 || a->pkey.dh->params.p == NULL
403 || a->pkey.dh->params.g == NULL;
406 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
408 if (dh_cmp_parameters(a, b) == 0)
410 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
416 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
419 return do_dh_print(bp, pkey->pkey.dh, indent, 0);
422 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
425 return do_dh_print(bp, pkey->pkey.dh, indent, 1);
428 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
431 return do_dh_print(bp, pkey->pkey.dh, indent, 2);
434 int DHparams_print(BIO *bp, const DH *x)
436 return do_dh_print(bp, x, 4, 0);
439 #ifndef OPENSSL_NO_CMS
440 static int dh_cms_decrypt(CMS_RecipientInfo *ri);
441 static int dh_cms_encrypt(CMS_RecipientInfo *ri);
444 static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
447 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
448 return dh_buf2key(EVP_PKEY_get0_DH(pkey), arg2, arg1);
449 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
450 return dh_key2buf(EVP_PKEY_get0_DH(pkey), arg2, 0, 1);
456 static int dhx_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
459 #ifndef OPENSSL_NO_CMS
461 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
463 return dh_cms_decrypt(arg2);
465 return dh_cms_encrypt(arg2);
468 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
469 *(int *)arg2 = CMS_RECIPINFO_AGREE;
478 static int dh_pkey_public_check(const EVP_PKEY *pkey)
480 DH *dh = pkey->pkey.dh;
482 if (dh->pub_key == NULL) {
483 DHerr(DH_F_DH_PKEY_PUBLIC_CHECK, DH_R_MISSING_PUBKEY);
487 return DH_check_pub_key_ex(dh, dh->pub_key);
490 static int dh_pkey_param_check(const EVP_PKEY *pkey)
492 DH *dh = pkey->pkey.dh;
494 return DH_check_ex(dh);
497 static size_t dh_pkey_dirty_cnt(const EVP_PKEY *pkey)
499 return pkey->pkey.dh->dirty_cnt;
502 static int dh_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
503 EVP_KEYMGMT *to_keymgmt, OPENSSL_CTX *libctx,
506 DH *dh = from->pkey.dh;
507 OSSL_PARAM_BLD *tmpl;
508 const BIGNUM *p = DH_get0_p(dh), *g = DH_get0_g(dh), *q = DH_get0_q(dh);
509 const BIGNUM *pub_key = DH_get0_pub_key(dh);
510 const BIGNUM *priv_key = DH_get0_priv_key(dh);
511 OSSL_PARAM *params = NULL;
516 * If the DH method is foreign, then we can't be sure of anything, and
517 * can therefore not export or pretend to export.
519 if (dh_get_method(dh) != DH_OpenSSL())
522 if (p == NULL || g == NULL)
525 tmpl = OSSL_PARAM_BLD_new();
528 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
529 || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
532 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q))
535 selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
536 if (pub_key != NULL) {
537 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
539 selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
541 if (priv_key != NULL) {
542 if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
545 selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
548 if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
551 /* We export, the provider imports */
552 rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
554 OSSL_PARAM_BLD_free_params(params);
556 OSSL_PARAM_BLD_free(tmpl);
560 static int dh_pkey_import_from_type(const OSSL_PARAM params[], void *vpctx,
563 EVP_PKEY_CTX *pctx = vpctx;
564 EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
565 DH *dh = dh_new_with_libctx(pctx->libctx);
567 DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
568 DH_set_flags(dh, type == EVP_PKEY_DH ? DH_FLAG_TYPE_DH : DH_FLAG_TYPE_DHX);
571 ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
575 if (!dh_ffc_params_fromdata(dh, params)
576 || !dh_key_fromdata(dh, params)
577 || !EVP_PKEY_assign(pkey, type, dh)) {
584 static int dh_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
586 return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DH);
589 static int dhx_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
591 return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DHX);
594 const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
600 "OpenSSL PKCS#3 DH method",
617 dh_missing_parameters,
629 dh_pkey_public_check,
639 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = {
645 "OpenSSL X9.42 DH method",
662 dh_missing_parameters,
674 dh_pkey_public_check,
679 dhx_pkey_import_from,
682 #ifndef OPENSSL_NO_CMS
684 static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
685 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
687 const ASN1_OBJECT *aoid;
690 ASN1_INTEGER *public_key = NULL;
692 EVP_PKEY *pkpeer = NULL, *pk = NULL;
694 const unsigned char *p;
697 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
698 if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
700 /* Only absent parameters allowed in RFC XXXX */
701 if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
704 pk = EVP_PKEY_CTX_get0_pkey(pctx);
707 if (pk->type != EVP_PKEY_DHX)
709 /* Get parameters from parent key */
710 dhpeer = DHparams_dup(pk->pkey.dh);
711 /* We have parameters now set public key */
712 plen = ASN1_STRING_length(pubkey);
713 p = ASN1_STRING_get0_data(pubkey);
714 if (p == NULL || plen == 0)
717 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, plen)) == NULL) {
718 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR);
722 /* We have parameters now set public key */
723 if ((dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
724 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR);
728 pkpeer = EVP_PKEY_new();
731 EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer);
733 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
736 ASN1_INTEGER_free(public_key);
737 EVP_PKEY_free(pkpeer);
742 static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
746 X509_ALGOR *alg, *kekalg = NULL;
747 ASN1_OCTET_STRING *ukm;
748 const unsigned char *p;
749 unsigned char *dukm = NULL;
752 const EVP_CIPHER *kekcipher;
753 EVP_CIPHER_CTX *kekctx;
755 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
759 * For DH we only have one OID permissible. If ever any more get defined
760 * we will need something cleverer.
762 if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) {
763 DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR);
767 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0)
770 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
773 if (alg->parameter->type != V_ASN1_SEQUENCE)
776 p = alg->parameter->value.sequence->data;
777 plen = alg->parameter->value.sequence->length;
778 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
781 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
784 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
785 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
787 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
789 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
792 keylen = EVP_CIPHER_CTX_key_length(kekctx);
793 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
795 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
796 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
797 OBJ_nid2obj(EVP_CIPHER_type(kekcipher)))
802 dukmlen = ASN1_STRING_length(ukm);
803 dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
808 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
814 X509_ALGOR_free(kekalg);
819 static int dh_cms_decrypt(CMS_RecipientInfo *ri)
823 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
827 /* See if we need to set peer key */
828 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
830 ASN1_BIT_STRING *pubkey;
831 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
836 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)) {
843 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
849 static int dh_cms_encrypt(CMS_RecipientInfo *ri)
855 X509_ALGOR *talg, *wrap_alg = NULL;
856 const ASN1_OBJECT *aoid;
857 ASN1_BIT_STRING *pubkey;
858 ASN1_STRING *wrap_str;
859 ASN1_OCTET_STRING *ukm;
860 unsigned char *penc = NULL, *dukm = NULL;
864 int kdf_type, wrap_nid;
865 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)) {
878 ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
884 penclen = i2d_ASN1_INTEGER(pubk, &penc);
885 ASN1_INTEGER_free(pubk);
888 ASN1_STRING_set0(pubkey, penc, penclen);
889 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
890 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
893 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
897 /* See if custom parameters set */
898 kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
901 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
904 if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
905 kdf_type = EVP_PKEY_DH_KDF_X9_42;
906 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
908 } else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
911 if (kdf_md == NULL) {
912 /* Only SHA1 supported */
914 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
916 } else if (EVP_MD_type(kdf_md) != NID_sha1)
917 /* Unsupported digest */
920 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
924 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
925 wrap_nid = EVP_CIPHER_CTX_type(ctx);
926 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
928 keylen = EVP_CIPHER_CTX_key_length(ctx);
930 /* Package wrap algorithm in an AlgorithmIdentifier */
932 wrap_alg = X509_ALGOR_new();
933 if (wrap_alg == NULL)
935 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
936 wrap_alg->parameter = ASN1_TYPE_new();
937 if (wrap_alg->parameter == NULL)
939 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
941 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
942 ASN1_TYPE_free(wrap_alg->parameter);
943 wrap_alg->parameter = NULL;
946 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
950 dukmlen = ASN1_STRING_length(ukm);
951 dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
956 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
961 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
962 * of another AlgorithmIdentifier.
965 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
966 if (penc == NULL || penclen == 0)
968 wrap_str = ASN1_STRING_new();
969 if (wrap_str == NULL)
971 ASN1_STRING_set0(wrap_str, penc, penclen);
973 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
974 V_ASN1_SEQUENCE, wrap_str);
980 X509_ALGOR_free(wrap_alg);