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);
184 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
186 const unsigned char *p = NULL;
189 EC_KEY *eckey = NULL;
192 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
194 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
196 eckey = eckey_type2param(ptype, pval);
199 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
203 /* We have parameters now set public key */
204 if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
205 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
209 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 /* calculate public key (if necessary) */
256 if (EC_KEY_get0_public_key(eckey) == NULL) {
257 const BIGNUM *priv_key;
258 const EC_GROUP *group;
261 * the public key was not included in the SEC1 private key =>
262 * calculate the public key
264 group = EC_KEY_get0_group(eckey);
265 pub_key = EC_POINT_new(group);
266 if (pub_key == NULL) {
267 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
270 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
271 EC_POINT_free(pub_key);
272 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
275 priv_key = EC_KEY_get0_private_key(eckey);
276 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
277 EC_POINT_free(pub_key);
278 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
281 if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
282 EC_POINT_free(pub_key);
283 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
286 EC_POINT_free(pub_key);
289 EVP_PKEY_assign_EC_KEY(pkey, eckey);
293 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
300 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
303 unsigned char *ep, *p;
306 unsigned int tmp_flags, old_flags;
308 ec_key = pkey->pkey.ec;
310 if (!eckey_param2type(&ptype, &pval, ec_key)) {
311 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
315 /* set the private key */
318 * do not include the parameters in the SEC1 private key see PKCS#11
321 old_flags = EC_KEY_get_enc_flags(ec_key);
322 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
323 EC_KEY_set_enc_flags(ec_key, tmp_flags);
324 eplen = i2d_ECPrivateKey(ec_key, NULL);
326 EC_KEY_set_enc_flags(ec_key, old_flags);
327 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
330 ep = (unsigned char *)OPENSSL_malloc(eplen);
332 EC_KEY_set_enc_flags(ec_key, old_flags);
333 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
337 if (!i2d_ECPrivateKey(ec_key, &p)) {
338 EC_KEY_set_enc_flags(ec_key, old_flags);
340 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
343 /* restore old encoding flags */
344 EC_KEY_set_enc_flags(ec_key, old_flags);
346 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
347 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_security_bits(const EVP_PKEY *pkey)
381 int ecbits = ec_bits(pkey);
395 static int ec_missing_parameters(const EVP_PKEY *pkey)
397 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
402 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
404 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
407 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
409 EC_GROUP_free(group);
413 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
415 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
416 *group_b = EC_KEY_get0_group(b->pkey.ec);
417 if (EC_GROUP_cmp(group_a, group_b, NULL))
423 static void int_ec_free(EVP_PKEY *pkey)
425 EC_KEY_free(pkey->pkey.ec);
428 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
430 unsigned char *buffer = NULL;
432 size_t buf_len = 0, i;
433 int ret = 0, reason = ERR_R_BIO_LIB;
434 BIGNUM *pub_key = NULL, *order = NULL;
436 const EC_GROUP *group;
437 const EC_POINT *public_key;
438 const BIGNUM *priv_key;
440 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
441 reason = ERR_R_PASSED_NULL_PARAMETER;
447 reason = ERR_R_MALLOC_FAILURE;
452 public_key = EC_KEY_get0_public_key(x);
453 if (public_key != NULL) {
454 if ((pub_key = EC_POINT_point2bn(group, public_key,
455 EC_KEY_get_conv_form(x), NULL,
457 reason = ERR_R_EC_LIB;
460 buf_len = (size_t)BN_num_bytes(pub_key);
465 priv_key = EC_KEY_get0_private_key(x);
466 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
473 if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
474 reason = ERR_R_MALLOC_FAILURE;
479 ecstr = "Private-Key";
481 ecstr = "Public-Key";
483 ecstr = "ECDSA-Parameters";
485 if (!BIO_indent(bp, off, 128))
487 if ((order = BN_new()) == NULL)
489 if (!EC_GROUP_get_order(group, order, NULL))
491 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0)
494 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
497 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
500 if (!ECPKParameters_print(bp, group, off))
505 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
513 OPENSSL_free(buffer);
517 static int eckey_param_decode(EVP_PKEY *pkey,
518 const unsigned char **pder, int derlen)
521 if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) {
522 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
525 EVP_PKEY_assign_EC_KEY(pkey, eckey);
529 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
531 return i2d_ECParameters(pkey->pkey.ec, pder);
534 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
537 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
540 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
543 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
546 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
549 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
552 static int old_ec_priv_decode(EVP_PKEY *pkey,
553 const unsigned char **pder, int derlen)
556 if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
557 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
560 EVP_PKEY_assign_EC_KEY(pkey, ec);
564 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
566 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
569 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
572 case ASN1_PKEY_CTRL_PKCS7_SIGN:
575 X509_ALGOR *alg1, *alg2;
576 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
577 if (alg1 == NULL || alg1->algorithm == NULL)
579 hnid = OBJ_obj2nid(alg1->algorithm);
580 if (hnid == NID_undef)
582 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
584 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
587 #ifndef OPENSSL_NO_CMS
588 case ASN1_PKEY_CTRL_CMS_SIGN:
591 X509_ALGOR *alg1, *alg2;
592 CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
593 if (alg1 == NULL || alg1->algorithm == NULL)
595 hnid = OBJ_obj2nid(alg1->algorithm);
596 if (hnid == NID_undef)
598 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
600 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
604 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
606 return ecdh_cms_decrypt(arg2);
608 return ecdh_cms_encrypt(arg2);
611 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
612 *(int *)arg2 = CMS_RECIPINFO_AGREE;
616 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
617 *(int *)arg2 = NID_sha256;
627 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
632 "OpenSSL EC algorithm",
649 ec_missing_parameters,
661 #ifndef OPENSSL_NO_CMS
663 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
664 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
670 EVP_PKEY *pkpeer = NULL;
671 EC_KEY *ecpeer = NULL;
672 const unsigned char *p;
674 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
675 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
677 /* If absent parameters get group from main key */
678 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
681 pk = EVP_PKEY_CTX_get0_pkey(pctx);
684 grp = EC_KEY_get0_group(pk->pkey.ec);
685 ecpeer = EC_KEY_new();
688 if (!EC_KEY_set_group(ecpeer, grp))
691 ecpeer = eckey_type2param(atype, aval);
695 /* We have parameters now set public key */
696 plen = ASN1_STRING_length(pubkey);
697 p = ASN1_STRING_data(pubkey);
700 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
702 pkpeer = EVP_PKEY_new();
705 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
706 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
712 EVP_PKEY_free(pkpeer);
716 /* Set KDF parameters based on KDF NID */
717 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
719 int kdf_nid, kdfmd_nid, cofactor;
720 const EVP_MD *kdf_md;
721 if (eckdf_nid == NID_undef)
724 /* Lookup KDF type, cofactor mode and digest */
725 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
728 if (kdf_nid == NID_dh_std_kdf)
730 else if (kdf_nid == NID_dh_cofactor_kdf)
735 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
738 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
741 kdf_md = EVP_get_digestbynid(kdfmd_nid);
745 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
750 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
754 X509_ALGOR *alg, *kekalg = NULL;
755 ASN1_OCTET_STRING *ukm;
756 const unsigned char *p;
757 unsigned char *der = NULL;
759 const EVP_CIPHER *kekcipher;
760 EVP_CIPHER_CTX *kekctx;
762 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
765 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
766 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
770 if (alg->parameter->type != V_ASN1_SEQUENCE)
773 p = alg->parameter->value.sequence->data;
774 plen = alg->parameter->value.sequence->length;
775 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
778 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
781 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
782 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
784 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
786 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
789 keylen = EVP_CIPHER_CTX_key_length(kekctx);
790 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
793 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
798 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
805 X509_ALGOR_free(kekalg);
811 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
814 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
817 /* See if we need to set peer key */
818 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
820 ASN1_BIT_STRING *pubkey;
821 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
826 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
827 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
831 /* Set ECDH derivation parameters and initialise unwrap context */
832 if (!ecdh_cms_set_shared_info(pctx, ri)) {
833 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
839 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
845 X509_ALGOR *talg, *wrap_alg = NULL;
847 ASN1_BIT_STRING *pubkey;
848 ASN1_STRING *wrap_str;
849 ASN1_OCTET_STRING *ukm;
850 unsigned char *penc = NULL;
853 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
854 const EVP_MD *kdf_md;
855 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
858 /* Get ephemeral key */
859 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
860 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
863 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
864 /* Is everything uninitialised? */
865 if (aoid == OBJ_nid2obj(NID_undef)) {
867 EC_KEY *eckey = pkey->pkey.ec;
871 penclen = i2o_ECPublicKey(eckey, NULL);
874 penc = OPENSSL_malloc(penclen);
878 penclen = i2o_ECPublicKey(eckey, &p);
881 ASN1_STRING_set0(pubkey, penc, penclen);
882 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
883 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
886 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
890 /* See if custom paraneters set */
891 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
894 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
896 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
899 else if (ecdh_nid == 0)
900 ecdh_nid = NID_dh_std_kdf;
901 else if (ecdh_nid == 1)
902 ecdh_nid = NID_dh_cofactor_kdf;
904 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
905 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
906 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
911 if (kdf_md == NULL) {
912 /* Fixme later for better MD */
914 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
918 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
921 /* Lookup NID for KDF+cofactor+digest */
923 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
926 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
927 wrap_nid = EVP_CIPHER_CTX_type(ctx);
928 keylen = EVP_CIPHER_CTX_key_length(ctx);
930 /* Package wrap algorithm in an AlgorithmIdentifier */
932 wrap_alg = X509_ALGOR_new();
935 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
936 wrap_alg->parameter = ASN1_TYPE_new();
937 if (!wrap_alg->parameter)
939 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
941 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
942 ASN1_TYPE_free(wrap_alg->parameter);
943 wrap_alg->parameter = NULL;
946 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
949 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
954 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
959 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
960 * of another AlgorithmIdentifier.
962 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
963 if (!penc || !penclen)
965 wrap_str = ASN1_STRING_new();
968 ASN1_STRING_set0(wrap_str, penc, penclen);
970 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
978 X509_ALGOR_free(wrap_alg);