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).
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 "asn1_locl.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);
143 static EC_KEY *eckey_type2param(int ptype, void *pval)
145 EC_KEY *eckey = NULL;
146 if (ptype == V_ASN1_SEQUENCE) {
147 ASN1_STRING *pstr = pval;
148 const unsigned char *pm = NULL;
151 pmlen = pstr->length;
152 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen))) {
153 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
156 } else if (ptype == V_ASN1_OBJECT) {
157 ASN1_OBJECT *poid = pval;
161 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
163 if ((eckey = EC_KEY_new()) == NULL) {
164 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
167 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
170 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
171 if (EC_KEY_set_group(eckey, group) == 0)
173 EC_GROUP_free(group);
175 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
187 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
189 const unsigned char *p = NULL;
192 EC_KEY *eckey = NULL;
195 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
197 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
199 eckey = eckey_type2param(ptype, pval);
202 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
206 /* We have parameters now set public key */
207 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
208 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
212 EVP_PKEY_assign_EC_KEY(pkey, eckey);
221 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
224 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
225 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
226 *pb = EC_KEY_get0_public_key(b->pkey.ec);
227 if (group == NULL || pa == NULL || pb == NULL)
229 r = EC_POINT_cmp(group, pa, pb, NULL);
237 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
239 const unsigned char *p = NULL;
242 EC_KEY *eckey = NULL;
245 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
247 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
249 eckey = eckey_type2param(ptype, pval);
254 /* We have parameters now set private key */
255 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
256 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
260 /* calculate public key (if necessary) */
261 if (EC_KEY_get0_public_key(eckey) == NULL) {
262 const BIGNUM *priv_key;
263 const EC_GROUP *group;
266 * the public key was not included in the SEC1 private key =>
267 * calculate the public key
269 group = EC_KEY_get0_group(eckey);
270 pub_key = EC_POINT_new(group);
271 if (pub_key == NULL) {
272 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
275 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
276 EC_POINT_free(pub_key);
277 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
280 priv_key = EC_KEY_get0_private_key(eckey);
281 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
282 EC_POINT_free(pub_key);
283 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
286 if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
287 EC_POINT_free(pub_key);
288 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
291 EC_POINT_free(pub_key);
294 EVP_PKEY_assign_EC_KEY(pkey, eckey);
298 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
305 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
307 EC_KEY ec_key = *(pkey->pkey.ec);
308 unsigned char *ep, *p;
311 unsigned int old_flags;
313 if (!eckey_param2type(&ptype, &pval, &ec_key)) {
314 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
318 /* set the private key */
321 * do not include the parameters in the SEC1 private key see PKCS#11
324 old_flags = EC_KEY_get_enc_flags(&ec_key);
325 EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
327 eplen = i2d_ECPrivateKey(&ec_key, NULL);
329 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
332 ep = (unsigned char *)OPENSSL_malloc(eplen);
334 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
338 if (!i2d_ECPrivateKey(&ec_key, &p)) {
340 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
344 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
345 ptype, pval, ep, eplen)) {
353 static int int_ec_size(const EVP_PKEY *pkey)
355 return ECDSA_size(pkey->pkey.ec);
358 static int ec_bits(const EVP_PKEY *pkey)
360 BIGNUM *order = BN_new();
361 const EC_GROUP *group;
368 group = EC_KEY_get0_group(pkey->pkey.ec);
369 if (!EC_GROUP_get_order(group, order, NULL)) {
374 ret = BN_num_bits(order);
379 static int ec_missing_parameters(const EVP_PKEY *pkey)
381 if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
386 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
388 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
391 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
393 EC_GROUP_free(group);
397 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
399 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
400 *group_b = EC_KEY_get0_group(b->pkey.ec);
401 if (group_a == NULL || group_b == NULL)
403 if (EC_GROUP_cmp(group_a, group_b, NULL))
409 static void int_ec_free(EVP_PKEY *pkey)
411 EC_KEY_free(pkey->pkey.ec);
414 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
416 unsigned char *buffer = NULL;
418 size_t buf_len = 0, i;
419 int ret = 0, reason = ERR_R_BIO_LIB;
420 BIGNUM *pub_key = NULL, *order = NULL;
422 const EC_GROUP *group;
423 const EC_POINT *public_key;
424 const BIGNUM *priv_key;
426 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
427 reason = ERR_R_PASSED_NULL_PARAMETER;
433 reason = ERR_R_MALLOC_FAILURE;
438 public_key = EC_KEY_get0_public_key(x);
439 if (public_key != NULL) {
440 if ((pub_key = EC_POINT_point2bn(group, public_key,
441 EC_KEY_get_conv_form(x), NULL,
443 reason = ERR_R_EC_LIB;
446 buf_len = (size_t)BN_num_bytes(pub_key);
451 priv_key = EC_KEY_get0_private_key(x);
452 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
459 if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
460 reason = ERR_R_MALLOC_FAILURE;
465 ecstr = "Private-Key";
467 ecstr = "Public-Key";
469 ecstr = "ECDSA-Parameters";
471 if (!BIO_indent(bp, off, 128))
473 if ((order = BN_new()) == NULL)
475 if (!EC_GROUP_get_order(group, order, NULL))
477 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0)
480 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
483 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
486 if (!ECPKParameters_print(bp, group, off))
491 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
499 OPENSSL_free(buffer);
503 static int eckey_param_decode(EVP_PKEY *pkey,
504 const unsigned char **pder, int derlen)
507 if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) {
508 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
511 EVP_PKEY_assign_EC_KEY(pkey, eckey);
515 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
517 return i2d_ECParameters(pkey->pkey.ec, pder);
520 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
523 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
526 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
529 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
532 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
535 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
538 static int old_ec_priv_decode(EVP_PKEY *pkey,
539 const unsigned char **pder, int derlen)
542 if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
543 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
546 EVP_PKEY_assign_EC_KEY(pkey, ec);
550 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
552 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
555 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
558 case ASN1_PKEY_CTRL_PKCS7_SIGN:
561 X509_ALGOR *alg1, *alg2;
562 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
563 if (alg1 == NULL || alg1->algorithm == NULL)
565 hnid = OBJ_obj2nid(alg1->algorithm);
566 if (hnid == NID_undef)
568 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
570 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
573 #ifndef OPENSSL_NO_CMS
574 case ASN1_PKEY_CTRL_CMS_SIGN:
577 X509_ALGOR *alg1, *alg2;
578 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
579 if (alg1 == NULL || alg1->algorithm == NULL)
581 hnid = OBJ_obj2nid(alg1->algorithm);
582 if (hnid == NID_undef)
584 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
586 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
590 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
592 return ecdh_cms_decrypt(arg2);
594 return ecdh_cms_encrypt(arg2);
597 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
598 *(int *)arg2 = CMS_RECIPINFO_AGREE;
602 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
603 *(int *)arg2 = NID_sha256;
613 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
618 "OpenSSL EC algorithm",
634 ec_missing_parameters,
646 #ifndef OPENSSL_NO_CMS
648 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
649 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
655 EVP_PKEY *pkpeer = NULL;
656 EC_KEY *ecpeer = NULL;
657 const unsigned char *p;
659 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
660 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
662 /* If absent parameters get group from main key */
663 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
666 pk = EVP_PKEY_CTX_get0_pkey(pctx);
669 grp = EC_KEY_get0_group(pk->pkey.ec);
670 ecpeer = EC_KEY_new();
673 if (!EC_KEY_set_group(ecpeer, grp))
676 ecpeer = eckey_type2param(atype, aval);
680 /* We have parameters now set public key */
681 plen = ASN1_STRING_length(pubkey);
682 p = ASN1_STRING_data(pubkey);
685 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
687 pkpeer = EVP_PKEY_new();
690 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
691 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
697 EVP_PKEY_free(pkpeer);
701 /* Set KDF parameters based on KDF NID */
702 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
704 int kdf_nid, kdfmd_nid, cofactor;
705 const EVP_MD *kdf_md;
706 if (eckdf_nid == NID_undef)
709 /* Lookup KDF type, cofactor mode and digest */
710 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
713 if (kdf_nid == NID_dh_std_kdf)
715 else if (kdf_nid == NID_dh_cofactor_kdf)
720 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
723 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
726 kdf_md = EVP_get_digestbynid(kdfmd_nid);
730 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
735 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
739 X509_ALGOR *alg, *kekalg = NULL;
740 ASN1_OCTET_STRING *ukm;
741 const unsigned char *p;
742 unsigned char *der = NULL;
744 const EVP_CIPHER *kekcipher;
745 EVP_CIPHER_CTX *kekctx;
747 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
750 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
751 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
755 if (alg->parameter->type != V_ASN1_SEQUENCE)
758 p = alg->parameter->value.sequence->data;
759 plen = alg->parameter->value.sequence->length;
760 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
763 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
766 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
767 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
769 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
771 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
774 keylen = EVP_CIPHER_CTX_key_length(kekctx);
775 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
778 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
783 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
790 X509_ALGOR_free(kekalg);
796 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
799 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
802 /* See if we need to set peer key */
803 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
805 ASN1_BIT_STRING *pubkey;
806 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
811 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
812 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
816 /* Set ECDH derivation parameters and initialise unwrap context */
817 if (!ecdh_cms_set_shared_info(pctx, ri)) {
818 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
824 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
830 X509_ALGOR *talg, *wrap_alg = NULL;
832 ASN1_BIT_STRING *pubkey;
833 ASN1_STRING *wrap_str;
834 ASN1_OCTET_STRING *ukm;
835 unsigned char *penc = NULL;
838 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
839 const EVP_MD *kdf_md;
840 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
843 /* Get ephemeral key */
844 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
845 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
848 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
849 /* Is everything uninitialised? */
850 if (aoid == OBJ_nid2obj(NID_undef)) {
852 EC_KEY *eckey = pkey->pkey.ec;
856 penclen = i2o_ECPublicKey(eckey, NULL);
859 penc = OPENSSL_malloc(penclen);
863 penclen = i2o_ECPublicKey(eckey, &p);
866 ASN1_STRING_set0(pubkey, penc, penclen);
867 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
868 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
871 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
875 /* See if custom paraneters set */
876 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
879 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
881 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
884 else if (ecdh_nid == 0)
885 ecdh_nid = NID_dh_std_kdf;
886 else if (ecdh_nid == 1)
887 ecdh_nid = NID_dh_cofactor_kdf;
889 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
890 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
891 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
896 if (kdf_md == NULL) {
897 /* Fixme later for better MD */
899 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
903 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
906 /* Lookup NID for KDF+cofactor+digest */
908 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
911 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
912 wrap_nid = EVP_CIPHER_CTX_type(ctx);
913 keylen = EVP_CIPHER_CTX_key_length(ctx);
915 /* Package wrap algorithm in an AlgorithmIdentifier */
917 wrap_alg = X509_ALGOR_new();
920 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
921 wrap_alg->parameter = ASN1_TYPE_new();
922 if (!wrap_alg->parameter)
924 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
926 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
927 ASN1_TYPE_free(wrap_alg->parameter);
928 wrap_alg->parameter = NULL;
931 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
934 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
939 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
944 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
945 * of another AlgorithmIdentifier.
947 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
948 if (!penc || !penclen)
950 wrap_str = ASN1_STRING_new();
953 ASN1_STRING_set0(wrap_str, penc, penclen);
955 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
963 X509_ALGOR_free(wrap_alg);