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 "internal/asn1_int.h"
70 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
71 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
73 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
75 const EC_GROUP *group;
77 if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
78 ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
81 if (EC_GROUP_get_asn1_flag(group)
82 && (nid = EC_GROUP_get_curve_name(group)))
83 /* we have a 'named curve' => just set the OID */
85 *ppval = OBJ_nid2obj(nid);
86 *pptype = V_ASN1_OBJECT;
87 } else { /* explicit parameters */
89 ASN1_STRING *pstr = NULL;
90 pstr = ASN1_STRING_new();
93 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
94 if (pstr->length <= 0) {
95 ASN1_STRING_free(pstr);
96 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
100 *pptype = V_ASN1_SEQUENCE;
105 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
107 EC_KEY *ec_key = pkey->pkey.ec;
110 unsigned char *penc = NULL, *p;
113 if (!eckey_param2type(&ptype, &pval, ec_key)) {
114 ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
117 penclen = i2o_ECPublicKey(ec_key, NULL);
120 penc = OPENSSL_malloc(penclen);
124 penclen = i2o_ECPublicKey(ec_key, &p);
127 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
128 ptype, pval, penc, penclen))
131 if (ptype == V_ASN1_OBJECT)
132 ASN1_OBJECT_free(pval);
134 ASN1_STRING_free(pval);
140 static EC_KEY *eckey_type2param(int ptype, void *pval)
142 EC_KEY *eckey = NULL;
143 if (ptype == V_ASN1_SEQUENCE) {
144 ASN1_STRING *pstr = pval;
145 const unsigned char *pm = NULL;
148 pmlen = pstr->length;
149 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen))) {
150 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
153 } else if (ptype == V_ASN1_OBJECT) {
154 ASN1_OBJECT *poid = pval;
158 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
160 if ((eckey = EC_KEY_new()) == NULL) {
161 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
164 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
167 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
168 if (EC_KEY_set_group(eckey, group) == 0)
170 EC_GROUP_free(group);
172 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
183 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
185 const unsigned char *p = NULL;
188 EC_KEY *eckey = NULL;
191 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
193 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
195 eckey = eckey_type2param(ptype, pval);
198 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
202 /* We have parameters now set public key */
203 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
204 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
208 EVP_PKEY_assign_EC_KEY(pkey, eckey);
216 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
219 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
220 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
221 *pb = EC_KEY_get0_public_key(b->pkey.ec);
222 r = EC_POINT_cmp(group, pa, pb, NULL);
230 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
232 const unsigned char *p = NULL;
235 EC_KEY *eckey = NULL;
238 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
240 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
242 eckey = eckey_type2param(ptype, pval);
247 /* We have parameters now set private key */
248 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
249 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
253 /* calculate public key (if necessary) */
254 if (EC_KEY_get0_public_key(eckey) == NULL) {
255 const BIGNUM *priv_key;
256 const EC_GROUP *group;
259 * the public key was not included in the SEC1 private key =>
260 * calculate the public key
262 group = EC_KEY_get0_group(eckey);
263 pub_key = EC_POINT_new(group);
264 if (pub_key == NULL) {
265 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
268 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
269 EC_POINT_free(pub_key);
270 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
273 priv_key = EC_KEY_get0_private_key(eckey);
274 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
275 EC_POINT_free(pub_key);
276 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
279 if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
280 EC_POINT_free(pub_key);
281 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
284 EC_POINT_free(pub_key);
287 EVP_PKEY_assign_EC_KEY(pkey, eckey);
291 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
297 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
300 unsigned char *ep, *p;
303 unsigned int tmp_flags, old_flags;
305 ec_key = pkey->pkey.ec;
307 if (!eckey_param2type(&ptype, &pval, ec_key)) {
308 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
312 /* set the private key */
315 * do not include the parameters in the SEC1 private key see PKCS#11
318 old_flags = EC_KEY_get_enc_flags(ec_key);
319 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
320 EC_KEY_set_enc_flags(ec_key, tmp_flags);
321 eplen = i2d_ECPrivateKey(ec_key, NULL);
323 EC_KEY_set_enc_flags(ec_key, old_flags);
324 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
327 ep = (unsigned char *)OPENSSL_malloc(eplen);
329 EC_KEY_set_enc_flags(ec_key, old_flags);
330 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
334 if (!i2d_ECPrivateKey(ec_key, &p)) {
335 EC_KEY_set_enc_flags(ec_key, old_flags);
337 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
340 /* restore old encoding flags */
341 EC_KEY_set_enc_flags(ec_key, old_flags);
343 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
344 ptype, pval, ep, eplen))
350 static int int_ec_size(const EVP_PKEY *pkey)
352 return ECDSA_size(pkey->pkey.ec);
355 static int ec_bits(const EVP_PKEY *pkey)
357 BIGNUM *order = BN_new();
358 const EC_GROUP *group;
365 group = EC_KEY_get0_group(pkey->pkey.ec);
366 if (!EC_GROUP_get_order(group, order, NULL)) {
371 ret = BN_num_bits(order);
376 static int ec_security_bits(const EVP_PKEY *pkey)
378 int ecbits = ec_bits(pkey);
392 static int ec_missing_parameters(const EVP_PKEY *pkey)
394 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
399 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
401 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
404 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
406 EC_GROUP_free(group);
410 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
412 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
413 *group_b = EC_KEY_get0_group(b->pkey.ec);
414 if (EC_GROUP_cmp(group_a, group_b, NULL))
420 static void int_ec_free(EVP_PKEY *pkey)
422 EC_KEY_free(pkey->pkey.ec);
425 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
427 unsigned char *buffer = NULL;
429 size_t buf_len = 0, i;
430 int ret = 0, reason = ERR_R_BIO_LIB;
431 BIGNUM *pub_key = NULL, *order = NULL;
433 const EC_GROUP *group;
434 const EC_POINT *public_key;
435 const BIGNUM *priv_key;
437 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
438 reason = ERR_R_PASSED_NULL_PARAMETER;
444 reason = ERR_R_MALLOC_FAILURE;
449 public_key = EC_KEY_get0_public_key(x);
450 if (public_key != NULL) {
451 if ((pub_key = EC_POINT_point2bn(group, public_key,
452 EC_KEY_get_conv_form(x), NULL,
454 reason = ERR_R_EC_LIB;
457 buf_len = (size_t)BN_num_bytes(pub_key);
462 priv_key = EC_KEY_get0_private_key(x);
463 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
470 if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
471 reason = ERR_R_MALLOC_FAILURE;
476 ecstr = "Private-Key";
478 ecstr = "Public-Key";
480 ecstr = "ECDSA-Parameters";
482 if (!BIO_indent(bp, off, 128))
484 if ((order = BN_new()) == NULL)
486 if (!EC_GROUP_get_order(group, order, NULL))
488 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0)
491 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
494 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
497 if (!ECPKParameters_print(bp, group, off))
502 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
510 OPENSSL_free(buffer);
514 static int eckey_param_decode(EVP_PKEY *pkey,
515 const unsigned char **pder, int derlen)
518 if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) {
519 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
522 EVP_PKEY_assign_EC_KEY(pkey, eckey);
526 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
528 return i2d_ECParameters(pkey->pkey.ec, pder);
531 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
534 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
537 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
540 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
543 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
546 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
549 static int old_ec_priv_decode(EVP_PKEY *pkey,
550 const unsigned char **pder, int derlen)
553 if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
554 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
557 EVP_PKEY_assign_EC_KEY(pkey, ec);
561 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
563 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
566 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
569 case ASN1_PKEY_CTRL_PKCS7_SIGN:
572 X509_ALGOR *alg1, *alg2;
573 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
574 if (alg1 == NULL || alg1->algorithm == NULL)
576 hnid = OBJ_obj2nid(alg1->algorithm);
577 if (hnid == NID_undef)
579 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
581 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
584 #ifndef OPENSSL_NO_CMS
585 case ASN1_PKEY_CTRL_CMS_SIGN:
588 X509_ALGOR *alg1, *alg2;
589 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
590 if (alg1 == NULL || alg1->algorithm == NULL)
592 hnid = OBJ_obj2nid(alg1->algorithm);
593 if (hnid == NID_undef)
595 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
597 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
601 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
603 return ecdh_cms_decrypt(arg2);
605 return ecdh_cms_encrypt(arg2);
608 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
609 *(int *)arg2 = CMS_RECIPINFO_AGREE;
613 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
614 *(int *)arg2 = NID_sha256;
624 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
629 "OpenSSL EC algorithm",
646 ec_missing_parameters,
658 #ifndef OPENSSL_NO_CMS
660 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
661 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
667 EVP_PKEY *pkpeer = NULL;
668 EC_KEY *ecpeer = NULL;
669 const unsigned char *p;
671 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
672 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
674 /* If absent parameters get group from main key */
675 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
678 pk = EVP_PKEY_CTX_get0_pkey(pctx);
681 grp = EC_KEY_get0_group(pk->pkey.ec);
682 ecpeer = EC_KEY_new();
685 if (!EC_KEY_set_group(ecpeer, grp))
688 ecpeer = eckey_type2param(atype, aval);
692 /* We have parameters now set public key */
693 plen = ASN1_STRING_length(pubkey);
694 p = ASN1_STRING_data(pubkey);
697 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
699 pkpeer = EVP_PKEY_new();
702 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
703 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
707 EVP_PKEY_free(pkpeer);
711 /* Set KDF parameters based on KDF NID */
712 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
714 int kdf_nid, kdfmd_nid, cofactor;
715 const EVP_MD *kdf_md;
716 if (eckdf_nid == NID_undef)
719 /* Lookup KDF type, cofactor mode and digest */
720 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
723 if (kdf_nid == NID_dh_std_kdf)
725 else if (kdf_nid == NID_dh_cofactor_kdf)
730 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
733 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
736 kdf_md = EVP_get_digestbynid(kdfmd_nid);
740 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
745 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
749 X509_ALGOR *alg, *kekalg = NULL;
750 ASN1_OCTET_STRING *ukm;
751 const unsigned char *p;
752 unsigned char *der = NULL;
754 const EVP_CIPHER *kekcipher;
755 EVP_CIPHER_CTX *kekctx;
757 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
760 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
761 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
765 if (alg->parameter->type != V_ASN1_SEQUENCE)
768 p = alg->parameter->value.sequence->data;
769 plen = alg->parameter->value.sequence->length;
770 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
773 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
776 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
777 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
779 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
781 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
784 keylen = EVP_CIPHER_CTX_key_length(kekctx);
785 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
788 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
793 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
800 X509_ALGOR_free(kekalg);
806 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
809 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
812 /* See if we need to set peer key */
813 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
815 ASN1_BIT_STRING *pubkey;
816 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
821 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
822 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
826 /* Set ECDH derivation parameters and initialise unwrap context */
827 if (!ecdh_cms_set_shared_info(pctx, ri)) {
828 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
834 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
840 X509_ALGOR *talg, *wrap_alg = NULL;
842 ASN1_BIT_STRING *pubkey;
843 ASN1_STRING *wrap_str;
844 ASN1_OCTET_STRING *ukm;
845 unsigned char *penc = NULL;
848 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
849 const EVP_MD *kdf_md;
850 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
853 /* Get ephemeral key */
854 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
855 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
858 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
859 /* Is everything uninitialised? */
860 if (aoid == OBJ_nid2obj(NID_undef)) {
862 EC_KEY *eckey = pkey->pkey.ec;
866 penclen = i2o_ECPublicKey(eckey, NULL);
869 penc = OPENSSL_malloc(penclen);
873 penclen = i2o_ECPublicKey(eckey, &p);
876 ASN1_STRING_set0(pubkey, penc, penclen);
877 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
878 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
881 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
885 /* See if custom paraneters set */
886 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
889 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
891 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
894 else if (ecdh_nid == 0)
895 ecdh_nid = NID_dh_std_kdf;
896 else if (ecdh_nid == 1)
897 ecdh_nid = NID_dh_cofactor_kdf;
899 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
900 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
901 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
906 if (kdf_md == NULL) {
907 /* Fixme later for better MD */
909 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
913 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
916 /* Lookup NID for KDF+cofactor+digest */
918 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
921 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
922 wrap_nid = EVP_CIPHER_CTX_type(ctx);
923 keylen = EVP_CIPHER_CTX_key_length(ctx);
925 /* Package wrap algorithm in an AlgorithmIdentifier */
927 wrap_alg = X509_ALGOR_new();
930 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
931 wrap_alg->parameter = ASN1_TYPE_new();
932 if (!wrap_alg->parameter)
934 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
936 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
937 ASN1_TYPE_free(wrap_alg->parameter);
938 wrap_alg->parameter = NULL;
941 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
944 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
949 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
954 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
955 * of another AlgorithmIdentifier.
957 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
958 if (!penc || !penclen)
960 wrap_str = ASN1_STRING_new();
963 ASN1_STRING_set0(wrap_str, penc, penclen);
965 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
973 X509_ALGOR_free(wrap_alg);