2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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 #include "internal/cryptlib.h"
12 #include <openssl/x509.h>
13 #include <openssl/ec.h>
14 #include <openssl/bn.h>
15 #include <openssl/cms.h>
16 #include <openssl/asn1t.h>
17 #include "internal/asn1_int.h"
18 #include "internal/evp_int.h"
21 #ifndef OPENSSL_NO_CMS
22 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
23 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
26 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
28 const EC_GROUP *group;
30 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
31 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
34 if (EC_GROUP_get_asn1_flag(group)
35 && (nid = EC_GROUP_get_curve_name(group)))
36 /* we have a 'named curve' => just set the OID */
38 *ppval = OBJ_nid2obj(nid);
39 *pptype = V_ASN1_OBJECT;
40 } else { /* explicit parameters */
42 ASN1_STRING *pstr = NULL;
43 pstr = ASN1_STRING_new();
46 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
47 if (pstr->length <= 0) {
48 ASN1_STRING_free(pstr);
49 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
53 *pptype = V_ASN1_SEQUENCE;
58 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
60 EC_KEY *ec_key = pkey->pkey.ec;
63 unsigned char *penc = NULL, *p;
66 if (!eckey_param2type(&ptype, &pval, ec_key)) {
67 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
70 penclen = i2o_ECPublicKey(ec_key, NULL);
73 penc = OPENSSL_malloc(penclen);
77 penclen = i2o_ECPublicKey(ec_key, &p);
80 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
81 ptype, pval, penc, penclen))
84 if (ptype == V_ASN1_OBJECT)
85 ASN1_OBJECT_free(pval);
87 ASN1_STRING_free(pval);
92 static EC_KEY *eckey_type2param(int ptype, const void *pval)
95 if (ptype == V_ASN1_SEQUENCE) {
96 const ASN1_STRING *pstr = pval;
97 const unsigned char *pm = NULL;
100 pmlen = pstr->length;
101 if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
102 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
105 } else if (ptype == V_ASN1_OBJECT) {
106 const ASN1_OBJECT *poid = pval;
110 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
112 if ((eckey = EC_KEY_new()) == NULL) {
113 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
116 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
119 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
120 if (EC_KEY_set_group(eckey, group) == 0)
122 EC_GROUP_free(group);
124 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
135 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
137 const unsigned char *p = NULL;
140 EC_KEY *eckey = NULL;
143 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
145 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
147 eckey = eckey_type2param(ptype, pval);
150 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
154 /* We have parameters now set public key */
155 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
156 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
160 EVP_PKEY_assign_EC_KEY(pkey, eckey);
168 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
171 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
172 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
173 *pb = EC_KEY_get0_public_key(b->pkey.ec);
174 if (group == NULL || pa == NULL || pb == NULL)
176 r = EC_POINT_cmp(group, pa, pb, NULL);
184 static int eckey_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
186 const unsigned char *p = NULL;
189 EC_KEY *eckey = NULL;
190 const X509_ALGOR *palg;
192 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
194 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
196 eckey = eckey_type2param(ptype, pval);
201 /* We have parameters now set private key */
202 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
203 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
207 EVP_PKEY_assign_EC_KEY(pkey, eckey);
211 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
217 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
219 EC_KEY ec_key = *(pkey->pkey.ec);
220 unsigned char *ep, *p;
223 unsigned int old_flags;
225 if (!eckey_param2type(&ptype, &pval, &ec_key)) {
226 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
230 /* set the private key */
233 * do not include the parameters in the SEC1 private key see PKCS#11
236 old_flags = EC_KEY_get_enc_flags(&ec_key);
237 EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
239 eplen = i2d_ECPrivateKey(&ec_key, NULL);
241 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
244 ep = OPENSSL_malloc(eplen);
246 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
250 if (!i2d_ECPrivateKey(&ec_key, &p)) {
252 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
256 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
257 ptype, pval, ep, eplen)) {
265 static int int_ec_size(const EVP_PKEY *pkey)
267 return ECDSA_size(pkey->pkey.ec);
270 static int ec_bits(const EVP_PKEY *pkey)
272 return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
275 static int ec_security_bits(const EVP_PKEY *pkey)
277 int ecbits = ec_bits(pkey);
291 static int ec_missing_parameters(const EVP_PKEY *pkey)
293 if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
298 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
300 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
304 if (to->pkey.ec == NULL) {
305 to->pkey.ec = EC_KEY_new();
306 if (to->pkey.ec == NULL)
309 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
311 EC_GROUP_free(group);
314 EC_GROUP_free(group);
318 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
320 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
321 *group_b = EC_KEY_get0_group(b->pkey.ec);
322 if (group_a == NULL || group_b == NULL)
324 if (EC_GROUP_cmp(group_a, group_b, NULL))
330 static void int_ec_free(EVP_PKEY *pkey)
332 EC_KEY_free(pkey->pkey.ec);
336 EC_KEY_PRINT_PRIVATE,
341 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
344 unsigned char *priv = NULL, *pub = NULL;
345 size_t privlen = 0, publen = 0;
347 const EC_GROUP *group;
349 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
350 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER);
354 if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) {
355 publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
360 if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
361 privlen = EC_KEY_priv2buf(x, &priv);
366 if (ktype == EC_KEY_PRINT_PRIVATE)
367 ecstr = "Private-Key";
368 else if (ktype == EC_KEY_PRINT_PUBLIC)
369 ecstr = "Public-Key";
371 ecstr = "ECDSA-Parameters";
373 if (!BIO_indent(bp, off, 128))
375 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
376 EC_GROUP_order_bits(group)) <= 0)
380 if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
382 if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
387 if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
389 if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
393 if (!ECPKParameters_print(bp, group, off))
398 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB);
399 OPENSSL_clear_free(priv, privlen);
404 static int eckey_param_decode(EVP_PKEY *pkey,
405 const unsigned char **pder, int derlen)
409 if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
410 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
413 EVP_PKEY_assign_EC_KEY(pkey, eckey);
417 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
419 return i2d_ECParameters(pkey->pkey.ec, pder);
422 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
425 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
428 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
431 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
434 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
437 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
440 static int old_ec_priv_decode(EVP_PKEY *pkey,
441 const unsigned char **pder, int derlen)
445 if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
446 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
449 EVP_PKEY_assign_EC_KEY(pkey, ec);
453 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
455 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
458 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
461 case ASN1_PKEY_CTRL_PKCS7_SIGN:
464 X509_ALGOR *alg1, *alg2;
465 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
466 if (alg1 == NULL || alg1->algorithm == NULL)
468 hnid = OBJ_obj2nid(alg1->algorithm);
469 if (hnid == NID_undef)
471 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
473 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
476 #ifndef OPENSSL_NO_CMS
477 case ASN1_PKEY_CTRL_CMS_SIGN:
480 X509_ALGOR *alg1, *alg2;
481 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
482 if (alg1 == NULL || alg1->algorithm == NULL)
484 hnid = OBJ_obj2nid(alg1->algorithm);
485 if (hnid == NID_undef)
487 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
489 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
493 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
495 return ecdh_cms_decrypt(arg2);
497 return ecdh_cms_encrypt(arg2);
500 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
501 *(int *)arg2 = CMS_RECIPINFO_AGREE;
505 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
506 *(int *)arg2 = NID_sha256;
509 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
510 return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL);
512 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
513 return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey),
514 POINT_CONVERSION_UNCOMPRESSED, arg2, NULL);
523 static int ec_pkey_check(const EVP_PKEY *pkey)
525 EC_KEY *eckey = pkey->pkey.ec;
527 /* stay consistent to what EVP_PKEY_check demands */
528 if (eckey->priv_key == NULL) {
529 ECerr(EC_F_EC_PKEY_CHECK, EC_R_MISSING_PRIVATE_KEY);
533 return EC_KEY_check_key(eckey);
536 static int ec_pkey_public_check(const EVP_PKEY *pkey)
538 EC_KEY *eckey = pkey->pkey.ec;
541 * Note: it unnecessary to check eckey->pub_key here since
542 * it will be checked in EC_KEY_check_key(). In fact, the
543 * EC_KEY_check_key() mainly checks the public key, and checks
544 * the private key optionally (only if there is one). So if
545 * someone passes a whole EC key (public + private), this
549 return EC_KEY_check_key(eckey);
552 static int ec_pkey_param_check(const EVP_PKEY *pkey)
554 EC_KEY *eckey = pkey->pkey.ec;
556 /* stay consistent to what EVP_PKEY_check demands */
557 if (eckey->group == NULL) {
558 ECerr(EC_F_EC_PKEY_PARAM_CHECK, EC_R_MISSING_PARAMETERS);
562 return EC_GROUP_check(eckey->group, NULL);
565 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
570 "OpenSSL EC algorithm",
587 ec_missing_parameters,
601 ec_pkey_public_check,
605 int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)
607 int private = EC_KEY_get0_private_key(x) != NULL;
609 return do_EC_KEY_print(bp, x, off,
610 private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC);
613 int ECParameters_print(BIO *bp, const EC_KEY *x)
615 return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
618 #ifndef OPENSSL_NO_CMS
620 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
621 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
623 const ASN1_OBJECT *aoid;
627 EVP_PKEY *pkpeer = NULL;
628 EC_KEY *ecpeer = NULL;
629 const unsigned char *p;
631 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
632 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
634 /* If absent parameters get group from main key */
635 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
638 pk = EVP_PKEY_CTX_get0_pkey(pctx);
641 grp = EC_KEY_get0_group(pk->pkey.ec);
642 ecpeer = EC_KEY_new();
645 if (!EC_KEY_set_group(ecpeer, grp))
648 ecpeer = eckey_type2param(atype, aval);
652 /* We have parameters now set public key */
653 plen = ASN1_STRING_length(pubkey);
654 p = ASN1_STRING_get0_data(pubkey);
657 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
659 pkpeer = EVP_PKEY_new();
662 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
663 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
667 EVP_PKEY_free(pkpeer);
671 /* Set KDF parameters based on KDF NID */
672 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
674 int kdf_nid, kdfmd_nid, cofactor;
675 const EVP_MD *kdf_md;
676 if (eckdf_nid == NID_undef)
679 /* Lookup KDF type, cofactor mode and digest */
680 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
683 if (kdf_nid == NID_dh_std_kdf)
685 else if (kdf_nid == NID_dh_cofactor_kdf)
690 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
693 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
696 kdf_md = EVP_get_digestbynid(kdfmd_nid);
700 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
705 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
709 X509_ALGOR *alg, *kekalg = NULL;
710 ASN1_OCTET_STRING *ukm;
711 const unsigned char *p;
712 unsigned char *der = NULL;
714 const EVP_CIPHER *kekcipher;
715 EVP_CIPHER_CTX *kekctx;
717 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
720 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
721 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
725 if (alg->parameter->type != V_ASN1_SEQUENCE)
728 p = alg->parameter->value.sequence->data;
729 plen = alg->parameter->value.sequence->length;
730 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
733 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
736 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
737 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
739 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
741 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
744 keylen = EVP_CIPHER_CTX_key_length(kekctx);
745 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
748 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
753 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
759 X509_ALGOR_free(kekalg);
764 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
767 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
770 /* See if we need to set peer key */
771 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
773 ASN1_BIT_STRING *pubkey;
774 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
779 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
780 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
784 /* Set ECDH derivation parameters and initialise unwrap context */
785 if (!ecdh_cms_set_shared_info(pctx, ri)) {
786 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
792 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
798 X509_ALGOR *talg, *wrap_alg = NULL;
799 const ASN1_OBJECT *aoid;
800 ASN1_BIT_STRING *pubkey;
801 ASN1_STRING *wrap_str;
802 ASN1_OCTET_STRING *ukm;
803 unsigned char *penc = NULL;
806 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
807 const EVP_MD *kdf_md;
808 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
811 /* Get ephemeral key */
812 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
813 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
816 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
817 /* Is everything uninitialised? */
818 if (aoid == OBJ_nid2obj(NID_undef)) {
820 EC_KEY *eckey = pkey->pkey.ec;
824 penclen = i2o_ECPublicKey(eckey, NULL);
827 penc = OPENSSL_malloc(penclen);
831 penclen = i2o_ECPublicKey(eckey, &p);
834 ASN1_STRING_set0(pubkey, penc, penclen);
835 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
836 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
839 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
843 /* See if custom parameters set */
844 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
847 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
849 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
852 else if (ecdh_nid == 0)
853 ecdh_nid = NID_dh_std_kdf;
854 else if (ecdh_nid == 1)
855 ecdh_nid = NID_dh_cofactor_kdf;
857 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
858 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
859 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
864 if (kdf_md == NULL) {
865 /* Fixme later for better MD */
867 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
871 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
874 /* Lookup NID for KDF+cofactor+digest */
876 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
879 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
880 wrap_nid = EVP_CIPHER_CTX_type(ctx);
881 keylen = EVP_CIPHER_CTX_key_length(ctx);
883 /* Package wrap algorithm in an AlgorithmIdentifier */
885 wrap_alg = X509_ALGOR_new();
886 if (wrap_alg == NULL)
888 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
889 wrap_alg->parameter = ASN1_TYPE_new();
890 if (wrap_alg->parameter == NULL)
892 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
894 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
895 ASN1_TYPE_free(wrap_alg->parameter);
896 wrap_alg->parameter = NULL;
899 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
902 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
907 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
912 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
913 * of another AlgorithmIdentifier.
915 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
916 if (!penc || !penclen)
918 wrap_str = ASN1_STRING_new();
919 if (wrap_str == NULL)
921 ASN1_STRING_set0(wrap_str, penc, penclen);
923 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
929 X509_ALGOR_free(wrap_alg);