2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
60 #include "internal/cryptlib.h"
61 #include <openssl/x509.h>
62 #include <openssl/ec.h>
63 #include <openssl/bn.h>
64 #ifndef OPENSSL_NO_CMS
65 # include <openssl/cms.h>
67 #include <openssl/asn1t.h>
68 #include "internal/asn1_int.h"
69 #include "internal/evp_int.h"
71 #ifndef OPENSSL_NO_CMS
72 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
73 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
76 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
78 const EC_GROUP *group;
80 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
81 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
84 if (EC_GROUP_get_asn1_flag(group)
85 && (nid = EC_GROUP_get_curve_name(group)))
86 /* we have a 'named curve' => just set the OID */
88 *ppval = OBJ_nid2obj(nid);
89 *pptype = V_ASN1_OBJECT;
90 } else { /* explicit parameters */
92 ASN1_STRING *pstr = NULL;
93 pstr = ASN1_STRING_new();
96 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
97 if (pstr->length <= 0) {
98 ASN1_STRING_free(pstr);
99 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
103 *pptype = V_ASN1_SEQUENCE;
108 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
110 EC_KEY *ec_key = pkey->pkey.ec;
113 unsigned char *penc = NULL, *p;
116 if (!eckey_param2type(&ptype, &pval, ec_key)) {
117 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
120 penclen = i2o_ECPublicKey(ec_key, NULL);
123 penc = OPENSSL_malloc(penclen);
127 penclen = i2o_ECPublicKey(ec_key, &p);
130 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
131 ptype, pval, penc, penclen))
134 if (ptype == V_ASN1_OBJECT)
135 ASN1_OBJECT_free(pval);
137 ASN1_STRING_free(pval);
142 static EC_KEY *eckey_type2param(int ptype, void *pval)
144 EC_KEY *eckey = NULL;
145 if (ptype == V_ASN1_SEQUENCE) {
146 ASN1_STRING *pstr = pval;
147 const unsigned char *pm = NULL;
150 pmlen = pstr->length;
151 if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
152 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
155 } else if (ptype == V_ASN1_OBJECT) {
156 ASN1_OBJECT *poid = pval;
160 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
162 if ((eckey = EC_KEY_new()) == NULL) {
163 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
166 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
169 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
170 if (EC_KEY_set_group(eckey, group) == 0)
172 EC_GROUP_free(group);
174 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
185 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
187 const unsigned char *p = NULL;
190 EC_KEY *eckey = NULL;
193 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
195 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
197 eckey = eckey_type2param(ptype, pval);
200 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
204 /* We have parameters now set public key */
205 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
206 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
210 EVP_PKEY_assign_EC_KEY(pkey, eckey);
218 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
221 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
222 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
223 *pb = EC_KEY_get0_public_key(b->pkey.ec);
224 r = EC_POINT_cmp(group, pa, pb, NULL);
232 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
234 const unsigned char *p = NULL;
237 EC_KEY *eckey = NULL;
240 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
242 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
244 eckey = eckey_type2param(ptype, pval);
249 /* We have parameters now set private key */
250 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
251 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
255 EVP_PKEY_assign_EC_KEY(pkey, eckey);
259 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
265 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
268 unsigned char *ep, *p;
271 unsigned int tmp_flags, old_flags;
273 ec_key = pkey->pkey.ec;
275 if (!eckey_param2type(&ptype, &pval, ec_key)) {
276 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
280 /* set the private key */
283 * do not include the parameters in the SEC1 private key see PKCS#11
286 old_flags = EC_KEY_get_enc_flags(ec_key);
287 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
288 EC_KEY_set_enc_flags(ec_key, tmp_flags);
289 eplen = i2d_ECPrivateKey(ec_key, NULL);
291 EC_KEY_set_enc_flags(ec_key, old_flags);
292 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
295 ep = OPENSSL_malloc(eplen);
297 EC_KEY_set_enc_flags(ec_key, old_flags);
298 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
302 if (!i2d_ECPrivateKey(ec_key, &p)) {
303 EC_KEY_set_enc_flags(ec_key, old_flags);
305 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
308 /* restore old encoding flags */
309 EC_KEY_set_enc_flags(ec_key, old_flags);
311 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
312 ptype, pval, ep, eplen))
318 static int int_ec_size(const EVP_PKEY *pkey)
320 return ECDSA_size(pkey->pkey.ec);
323 static int ec_bits(const EVP_PKEY *pkey)
325 return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
328 static int ec_security_bits(const EVP_PKEY *pkey)
330 int ecbits = ec_bits(pkey);
344 static int ec_missing_parameters(const EVP_PKEY *pkey)
346 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
351 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
353 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
356 if (to->pkey.ec == NULL) {
357 to->pkey.ec = EC_KEY_new();
358 if (to->pkey.ec == NULL)
361 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
363 EC_GROUP_free(group);
367 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
369 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
370 *group_b = EC_KEY_get0_group(b->pkey.ec);
371 if (EC_GROUP_cmp(group_a, group_b, NULL))
377 static void int_ec_free(EVP_PKEY *pkey)
379 EC_KEY_free(pkey->pkey.ec);
383 EC_KEY_PRINT_PRIVATE,
388 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
391 unsigned char *priv = NULL, *pub = NULL;
392 size_t privlen = 0, publen = 0;
394 const EC_GROUP *group;
396 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
397 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER);
401 if (ktype != EC_KEY_PRINT_PARAM) {
402 publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
407 if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
408 privlen = EC_KEY_priv2buf(x, &priv);
413 if (ktype == EC_KEY_PRINT_PRIVATE)
414 ecstr = "Private-Key";
415 else if (ktype == EC_KEY_PRINT_PUBLIC)
416 ecstr = "Public-Key";
418 ecstr = "ECDSA-Parameters";
420 if (!BIO_indent(bp, off, 128))
422 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
423 EC_GROUP_order_bits(group)) <= 0)
427 if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
429 if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
434 if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
436 if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
440 if (!ECPKParameters_print(bp, group, off))
445 ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB);
446 OPENSSL_clear_free(priv, privlen);
451 static int eckey_param_decode(EVP_PKEY *pkey,
452 const unsigned char **pder, int derlen)
456 if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
457 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
460 EVP_PKEY_assign_EC_KEY(pkey, eckey);
464 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
466 return i2d_ECParameters(pkey->pkey.ec, pder);
469 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
472 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
475 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
478 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
481 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
484 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
487 static int old_ec_priv_decode(EVP_PKEY *pkey,
488 const unsigned char **pder, int derlen)
492 if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
493 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
496 EVP_PKEY_assign_EC_KEY(pkey, ec);
500 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
502 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
505 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
508 case ASN1_PKEY_CTRL_PKCS7_SIGN:
511 X509_ALGOR *alg1, *alg2;
512 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
513 if (alg1 == NULL || alg1->algorithm == NULL)
515 hnid = OBJ_obj2nid(alg1->algorithm);
516 if (hnid == NID_undef)
518 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
520 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
523 #ifndef OPENSSL_NO_CMS
524 case ASN1_PKEY_CTRL_CMS_SIGN:
527 X509_ALGOR *alg1, *alg2;
528 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
529 if (alg1 == NULL || alg1->algorithm == NULL)
531 hnid = OBJ_obj2nid(alg1->algorithm);
532 if (hnid == NID_undef)
534 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
536 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
540 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
542 return ecdh_cms_decrypt(arg2);
544 return ecdh_cms_encrypt(arg2);
547 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
548 *(int *)arg2 = CMS_RECIPINFO_AGREE;
552 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
553 *(int *)arg2 = NID_sha256;
563 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
568 "OpenSSL EC algorithm",
585 ec_missing_parameters,
597 #ifndef OPENSSL_NO_CMS
599 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
600 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
606 EVP_PKEY *pkpeer = NULL;
607 EC_KEY *ecpeer = NULL;
608 const unsigned char *p;
610 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
611 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
613 /* If absent parameters get group from main key */
614 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
617 pk = EVP_PKEY_CTX_get0_pkey(pctx);
620 grp = EC_KEY_get0_group(pk->pkey.ec);
621 ecpeer = EC_KEY_new();
624 if (!EC_KEY_set_group(ecpeer, grp))
627 ecpeer = eckey_type2param(atype, aval);
631 /* We have parameters now set public key */
632 plen = ASN1_STRING_length(pubkey);
633 p = ASN1_STRING_data(pubkey);
636 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
638 pkpeer = EVP_PKEY_new();
641 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
642 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
646 EVP_PKEY_free(pkpeer);
650 /* Set KDF parameters based on KDF NID */
651 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
653 int kdf_nid, kdfmd_nid, cofactor;
654 const EVP_MD *kdf_md;
655 if (eckdf_nid == NID_undef)
658 /* Lookup KDF type, cofactor mode and digest */
659 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
662 if (kdf_nid == NID_dh_std_kdf)
664 else if (kdf_nid == NID_dh_cofactor_kdf)
669 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
672 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
675 kdf_md = EVP_get_digestbynid(kdfmd_nid);
679 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
684 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
688 X509_ALGOR *alg, *kekalg = NULL;
689 ASN1_OCTET_STRING *ukm;
690 const unsigned char *p;
691 unsigned char *der = NULL;
693 const EVP_CIPHER *kekcipher;
694 EVP_CIPHER_CTX *kekctx;
696 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
699 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
700 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
704 if (alg->parameter->type != V_ASN1_SEQUENCE)
707 p = alg->parameter->value.sequence->data;
708 plen = alg->parameter->value.sequence->length;
709 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
712 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
715 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
716 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
718 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
720 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
723 keylen = EVP_CIPHER_CTX_key_length(kekctx);
724 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
727 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
732 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
738 X509_ALGOR_free(kekalg);
743 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
746 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
749 /* See if we need to set peer key */
750 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
752 ASN1_BIT_STRING *pubkey;
753 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
758 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
759 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
763 /* Set ECDH derivation parameters and initialise unwrap context */
764 if (!ecdh_cms_set_shared_info(pctx, ri)) {
765 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
771 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
777 X509_ALGOR *talg, *wrap_alg = NULL;
779 ASN1_BIT_STRING *pubkey;
780 ASN1_STRING *wrap_str;
781 ASN1_OCTET_STRING *ukm;
782 unsigned char *penc = NULL;
785 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
786 const EVP_MD *kdf_md;
787 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
790 /* Get ephemeral key */
791 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
792 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
795 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
796 /* Is everything uninitialised? */
797 if (aoid == OBJ_nid2obj(NID_undef)) {
799 EC_KEY *eckey = pkey->pkey.ec;
803 penclen = i2o_ECPublicKey(eckey, NULL);
806 penc = OPENSSL_malloc(penclen);
810 penclen = i2o_ECPublicKey(eckey, &p);
813 ASN1_STRING_set0(pubkey, penc, penclen);
814 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
815 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
818 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
822 /* See if custom parameters set */
823 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
826 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
828 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
831 else if (ecdh_nid == 0)
832 ecdh_nid = NID_dh_std_kdf;
833 else if (ecdh_nid == 1)
834 ecdh_nid = NID_dh_cofactor_kdf;
836 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
837 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
838 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
843 if (kdf_md == NULL) {
844 /* Fixme later for better MD */
846 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
850 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
853 /* Lookup NID for KDF+cofactor+digest */
855 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
858 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
859 wrap_nid = EVP_CIPHER_CTX_type(ctx);
860 keylen = EVP_CIPHER_CTX_key_length(ctx);
862 /* Package wrap algorithm in an AlgorithmIdentifier */
864 wrap_alg = X509_ALGOR_new();
865 if (wrap_alg == NULL)
867 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
868 wrap_alg->parameter = ASN1_TYPE_new();
869 if (wrap_alg->parameter == NULL)
871 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
873 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
874 ASN1_TYPE_free(wrap_alg->parameter);
875 wrap_alg->parameter = NULL;
878 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
881 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
886 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
891 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
892 * of another AlgorithmIdentifier.
894 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
895 if (!penc || !penclen)
897 wrap_str = ASN1_STRING_new();
898 if (wrap_str == NULL)
900 ASN1_STRING_set0(wrap_str, penc, penclen);
902 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
908 X509_ALGOR_free(wrap_alg);