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"
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);
139 static EC_KEY *eckey_type2param(int ptype, void *pval)
141 EC_KEY *eckey = NULL;
142 if (ptype == V_ASN1_SEQUENCE) {
143 ASN1_STRING *pstr = pval;
144 const unsigned char *pm = NULL;
147 pmlen = pstr->length;
148 if ((eckey = d2i_ECParameters(NULL, &pm, pmlen)) == NULL) {
149 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
152 } else if (ptype == V_ASN1_OBJECT) {
153 ASN1_OBJECT *poid = pval;
157 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
159 if ((eckey = EC_KEY_new()) == NULL) {
160 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
163 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
166 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
167 if (EC_KEY_set_group(eckey, group) == 0)
169 EC_GROUP_free(group);
171 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
182 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
184 const unsigned char *p = NULL;
187 EC_KEY *eckey = NULL;
190 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
192 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
194 eckey = eckey_type2param(ptype, pval);
197 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
201 /* We have parameters now set public key */
202 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
203 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
207 EVP_PKEY_assign_EC_KEY(pkey, eckey);
215 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
218 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
219 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
220 *pb = EC_KEY_get0_public_key(b->pkey.ec);
221 r = EC_POINT_cmp(group, pa, pb, NULL);
229 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
231 const unsigned char *p = NULL;
234 EC_KEY *eckey = NULL;
237 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
239 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
241 eckey = eckey_type2param(ptype, pval);
246 /* We have parameters now set private key */
247 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
248 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
252 /* calculate public key (if necessary) */
253 if (EC_KEY_get0_public_key(eckey) == NULL) {
254 const BIGNUM *priv_key;
255 const EC_GROUP *group;
258 * the public key was not included in the SEC1 private key =>
259 * calculate the public key
261 group = EC_KEY_get0_group(eckey);
262 pub_key = EC_POINT_new(group);
263 if (pub_key == NULL) {
264 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
267 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
268 EC_POINT_free(pub_key);
269 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
272 priv_key = EC_KEY_get0_private_key(eckey);
273 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
274 EC_POINT_free(pub_key);
275 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
278 if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
279 EC_POINT_free(pub_key);
280 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
283 EC_POINT_free(pub_key);
286 EVP_PKEY_assign_EC_KEY(pkey, eckey);
290 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
296 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
299 unsigned char *ep, *p;
302 unsigned int tmp_flags, old_flags;
304 ec_key = pkey->pkey.ec;
306 if (!eckey_param2type(&ptype, &pval, ec_key)) {
307 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
311 /* set the private key */
314 * do not include the parameters in the SEC1 private key see PKCS#11
317 old_flags = EC_KEY_get_enc_flags(ec_key);
318 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
319 EC_KEY_set_enc_flags(ec_key, tmp_flags);
320 eplen = i2d_ECPrivateKey(ec_key, NULL);
322 EC_KEY_set_enc_flags(ec_key, old_flags);
323 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
326 ep = OPENSSL_malloc(eplen);
328 EC_KEY_set_enc_flags(ec_key, old_flags);
329 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
333 if (!i2d_ECPrivateKey(ec_key, &p)) {
334 EC_KEY_set_enc_flags(ec_key, old_flags);
336 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
339 /* restore old encoding flags */
340 EC_KEY_set_enc_flags(ec_key, old_flags);
342 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
343 ptype, pval, ep, eplen))
349 static int int_ec_size(const EVP_PKEY *pkey)
351 return ECDSA_size(pkey->pkey.ec);
354 static int ec_bits(const EVP_PKEY *pkey)
356 BIGNUM *order = BN_new();
357 const EC_GROUP *group;
364 group = EC_KEY_get0_group(pkey->pkey.ec);
365 if (!EC_GROUP_get_order(group, order, NULL)) {
370 ret = BN_num_bits(order);
375 static int ec_security_bits(const EVP_PKEY *pkey)
377 int ecbits = ec_bits(pkey);
391 static int ec_missing_parameters(const EVP_PKEY *pkey)
393 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
398 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
400 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
403 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
405 EC_GROUP_free(group);
409 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
411 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
412 *group_b = EC_KEY_get0_group(b->pkey.ec);
413 if (EC_GROUP_cmp(group_a, group_b, NULL))
419 static void int_ec_free(EVP_PKEY *pkey)
421 EC_KEY_free(pkey->pkey.ec);
424 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
426 unsigned char *buffer = NULL;
428 size_t buf_len = 0, i;
429 int ret = 0, reason = ERR_R_BIO_LIB;
430 BIGNUM *pub_key = NULL, *order = NULL;
432 const EC_GROUP *group;
433 const EC_POINT *public_key;
434 const BIGNUM *priv_key;
436 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
437 reason = ERR_R_PASSED_NULL_PARAMETER;
443 reason = ERR_R_MALLOC_FAILURE;
448 public_key = EC_KEY_get0_public_key(x);
449 if (public_key != NULL) {
450 if ((pub_key = EC_POINT_point2bn(group, public_key,
451 EC_KEY_get_conv_form(x), NULL,
453 reason = ERR_R_EC_LIB;
456 buf_len = (size_t)BN_num_bytes(pub_key);
461 priv_key = EC_KEY_get0_private_key(x);
462 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
469 if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
470 reason = ERR_R_MALLOC_FAILURE;
475 ecstr = "Private-Key";
477 ecstr = "Public-Key";
479 ecstr = "ECDSA-Parameters";
481 if (!BIO_indent(bp, off, 128))
483 if ((order = BN_new()) == NULL)
485 if (!EC_GROUP_get_order(group, order, NULL))
487 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0)
490 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
493 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
496 if (!ECPKParameters_print(bp, group, off))
501 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
505 OPENSSL_free(buffer);
509 static int eckey_param_decode(EVP_PKEY *pkey,
510 const unsigned char **pder, int derlen)
514 if ((eckey = d2i_ECParameters(NULL, pder, derlen)) == NULL) {
515 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
518 EVP_PKEY_assign_EC_KEY(pkey, eckey);
522 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
524 return i2d_ECParameters(pkey->pkey.ec, pder);
527 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
530 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
533 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
536 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
539 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
542 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
545 static int old_ec_priv_decode(EVP_PKEY *pkey,
546 const unsigned char **pder, int derlen)
550 if ((ec = d2i_ECPrivateKey(NULL, pder, derlen)) == NULL) {
551 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
554 EVP_PKEY_assign_EC_KEY(pkey, ec);
558 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
560 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
563 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
566 case ASN1_PKEY_CTRL_PKCS7_SIGN:
569 X509_ALGOR *alg1, *alg2;
570 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
571 if (alg1 == NULL || alg1->algorithm == NULL)
573 hnid = OBJ_obj2nid(alg1->algorithm);
574 if (hnid == NID_undef)
576 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
578 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
581 #ifndef OPENSSL_NO_CMS
582 case ASN1_PKEY_CTRL_CMS_SIGN:
585 X509_ALGOR *alg1, *alg2;
586 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
587 if (alg1 == NULL || alg1->algorithm == NULL)
589 hnid = OBJ_obj2nid(alg1->algorithm);
590 if (hnid == NID_undef)
592 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
594 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
598 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
600 return ecdh_cms_decrypt(arg2);
602 return ecdh_cms_encrypt(arg2);
605 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
606 *(int *)arg2 = CMS_RECIPINFO_AGREE;
610 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
611 *(int *)arg2 = NID_sha256;
621 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
626 "OpenSSL EC algorithm",
643 ec_missing_parameters,
655 #ifndef OPENSSL_NO_CMS
657 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
658 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
664 EVP_PKEY *pkpeer = NULL;
665 EC_KEY *ecpeer = NULL;
666 const unsigned char *p;
668 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
669 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
671 /* If absent parameters get group from main key */
672 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
675 pk = EVP_PKEY_CTX_get0_pkey(pctx);
678 grp = EC_KEY_get0_group(pk->pkey.ec);
679 ecpeer = EC_KEY_new();
682 if (!EC_KEY_set_group(ecpeer, grp))
685 ecpeer = eckey_type2param(atype, aval);
689 /* We have parameters now set public key */
690 plen = ASN1_STRING_length(pubkey);
691 p = ASN1_STRING_data(pubkey);
694 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
696 pkpeer = EVP_PKEY_new();
699 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
700 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
704 EVP_PKEY_free(pkpeer);
708 /* Set KDF parameters based on KDF NID */
709 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
711 int kdf_nid, kdfmd_nid, cofactor;
712 const EVP_MD *kdf_md;
713 if (eckdf_nid == NID_undef)
716 /* Lookup KDF type, cofactor mode and digest */
717 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
720 if (kdf_nid == NID_dh_std_kdf)
722 else if (kdf_nid == NID_dh_cofactor_kdf)
727 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
730 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
733 kdf_md = EVP_get_digestbynid(kdfmd_nid);
737 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
742 static int ecdh_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 *der = NULL;
751 const EVP_CIPHER *kekcipher;
752 EVP_CIPHER_CTX *kekctx;
754 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
757 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
758 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
762 if (alg->parameter->type != V_ASN1_SEQUENCE)
765 p = alg->parameter->value.sequence->data;
766 plen = alg->parameter->value.sequence->length;
767 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
770 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
773 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
774 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
776 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
778 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
781 keylen = EVP_CIPHER_CTX_key_length(kekctx);
782 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
785 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
790 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
796 X509_ALGOR_free(kekalg);
801 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
804 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
807 /* See if we need to set peer key */
808 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
810 ASN1_BIT_STRING *pubkey;
811 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
816 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
817 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
821 /* Set ECDH derivation parameters and initialise unwrap context */
822 if (!ecdh_cms_set_shared_info(pctx, ri)) {
823 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
829 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
835 X509_ALGOR *talg, *wrap_alg = NULL;
837 ASN1_BIT_STRING *pubkey;
838 ASN1_STRING *wrap_str;
839 ASN1_OCTET_STRING *ukm;
840 unsigned char *penc = NULL;
843 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
844 const EVP_MD *kdf_md;
845 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
848 /* Get ephemeral key */
849 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
850 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
853 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
854 /* Is everything uninitialised? */
855 if (aoid == OBJ_nid2obj(NID_undef)) {
857 EC_KEY *eckey = pkey->pkey.ec;
861 penclen = i2o_ECPublicKey(eckey, NULL);
864 penc = OPENSSL_malloc(penclen);
868 penclen = i2o_ECPublicKey(eckey, &p);
871 ASN1_STRING_set0(pubkey, penc, penclen);
872 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
873 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
876 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
880 /* See if custom paraneters set */
881 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
884 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
886 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
889 else if (ecdh_nid == 0)
890 ecdh_nid = NID_dh_std_kdf;
891 else if (ecdh_nid == 1)
892 ecdh_nid = NID_dh_cofactor_kdf;
894 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
895 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
896 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
901 if (kdf_md == NULL) {
902 /* Fixme later for better MD */
904 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
908 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
911 /* Lookup NID for KDF+cofactor+digest */
913 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
916 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
917 wrap_nid = EVP_CIPHER_CTX_type(ctx);
918 keylen = EVP_CIPHER_CTX_key_length(ctx);
920 /* Package wrap algorithm in an AlgorithmIdentifier */
922 wrap_alg = X509_ALGOR_new();
925 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
926 wrap_alg->parameter = ASN1_TYPE_new();
927 if (!wrap_alg->parameter)
929 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
931 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
932 ASN1_TYPE_free(wrap_alg->parameter);
933 wrap_alg->parameter = NULL;
936 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
939 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
944 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
949 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
950 * of another AlgorithmIdentifier.
952 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
953 if (!penc || !penclen)
955 wrap_str = ASN1_STRING_new();
958 ASN1_STRING_set0(wrap_str, penc, penclen);
960 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
966 X509_ALGOR_free(wrap_alg);