1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/x509.h>
61 #include <openssl/ec.h>
62 #include <openssl/bn.h>
63 #ifndef OPENSSL_NO_CMS
64 #include <openssl/cms.h>
66 #include <openssl/asn1t.h>
67 #include "asn1_locl.h"
69 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
70 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
72 static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
74 const EC_GROUP *group;
76 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;
88 else /* explicit parameters */
90 ASN1_STRING *pstr = NULL;
91 pstr = ASN1_STRING_new();
94 pstr->length = i2d_ECParameters(ec_key, &pstr->data);
95 if (pstr->length <= 0)
97 ASN1_STRING_free(pstr);
98 ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
102 *pptype = V_ASN1_SEQUENCE;
107 static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
109 EC_KEY *ec_key = pkey->pkey.ec;
112 unsigned char *penc = NULL, *p;
115 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)
148 ASN1_STRING *pstr = pval;
149 const unsigned char *pm = NULL;
152 pmlen = pstr->length;
153 if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen)))
155 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
159 else if (ptype == V_ASN1_OBJECT)
161 ASN1_OBJECT *poid = pval;
164 /* type == V_ASN1_OBJECT => the parameters are given
167 if ((eckey = EC_KEY_new()) == NULL)
169 ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
172 group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
175 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
176 if (EC_KEY_set_group(eckey, group) == 0)
178 EC_GROUP_free(group);
182 ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
194 static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
196 const unsigned char *p = NULL;
199 EC_KEY *eckey = NULL;
202 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
204 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
206 eckey = eckey_type2param(ptype, pval);
210 ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
214 /* We have parameters now set public key */
215 if (!o2i_ECPublicKey(&eckey, &p, pklen))
217 ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
221 EVP_PKEY_assign_EC_KEY(pkey, eckey);
230 static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
233 const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
234 const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
235 *pb = EC_KEY_get0_public_key(b->pkey.ec);
236 r = EC_POINT_cmp(group, pa, pb, NULL);
244 static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
246 const unsigned char *p = NULL;
249 EC_KEY *eckey = NULL;
252 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
254 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
256 eckey = eckey_type2param(ptype, pval);
261 /* We have parameters now set private key */
262 if (!d2i_ECPrivateKey(&eckey, &p, pklen))
264 ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
268 /* calculate public key (if necessary) */
269 if (EC_KEY_get0_public_key(eckey) == NULL)
271 const BIGNUM *priv_key;
272 const EC_GROUP *group;
274 /* the public key was not included in the SEC1 private
275 * key => calculate the public key */
276 group = EC_KEY_get0_group(eckey);
277 pub_key = EC_POINT_new(group);
280 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
283 if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group)))
285 EC_POINT_free(pub_key);
286 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
289 priv_key = EC_KEY_get0_private_key(eckey);
290 if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL))
292 EC_POINT_free(pub_key);
293 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
296 if (EC_KEY_set_public_key(eckey, pub_key) == 0)
298 EC_POINT_free(pub_key);
299 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
302 EC_POINT_free(pub_key);
305 EVP_PKEY_assign_EC_KEY(pkey, eckey);
309 ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
316 static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
319 unsigned char *ep, *p;
322 unsigned int tmp_flags, old_flags;
324 ec_key = pkey->pkey.ec;
326 if (!eckey_param2type(&ptype, &pval, ec_key))
328 ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
332 /* set the private key */
334 /* do not include the parameters in the SEC1 private key
335 * see PKCS#11 12.11 */
336 old_flags = EC_KEY_get_enc_flags(ec_key);
337 tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
338 EC_KEY_set_enc_flags(ec_key, tmp_flags);
339 eplen = i2d_ECPrivateKey(ec_key, NULL);
342 EC_KEY_set_enc_flags(ec_key, old_flags);
343 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
346 ep = (unsigned char *) OPENSSL_malloc(eplen);
349 EC_KEY_set_enc_flags(ec_key, old_flags);
350 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
354 if (!i2d_ECPrivateKey(ec_key, &p))
356 EC_KEY_set_enc_flags(ec_key, old_flags);
358 ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
361 /* restore old encoding flags */
362 EC_KEY_set_enc_flags(ec_key, old_flags);
364 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
365 ptype, pval, ep, eplen))
371 static int int_ec_size(const EVP_PKEY *pkey)
373 return ECDSA_size(pkey->pkey.ec);
376 static int ec_bits(const EVP_PKEY *pkey)
378 BIGNUM *order = BN_new();
379 const EC_GROUP *group;
387 group = EC_KEY_get0_group(pkey->pkey.ec);
388 if (!EC_GROUP_get_order(group, order, NULL))
394 ret = BN_num_bits(order);
399 static int ec_missing_parameters(const EVP_PKEY *pkey)
401 if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
406 static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
408 EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
411 if (EC_KEY_set_group(to->pkey.ec, group) == 0)
413 EC_GROUP_free(group);
417 static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
419 const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
420 *group_b = EC_KEY_get0_group(b->pkey.ec);
421 if (EC_GROUP_cmp(group_a, group_b, NULL))
427 static void int_ec_free(EVP_PKEY *pkey)
429 EC_KEY_free(pkey->pkey.ec);
432 static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
434 unsigned char *buffer=NULL;
437 int ret=0, reason=ERR_R_BIO_LIB;
438 BIGNUM *pub_key=NULL, *order=NULL;
440 const EC_GROUP *group;
441 const EC_POINT *public_key;
442 const BIGNUM *priv_key;
444 if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL)
446 reason = ERR_R_PASSED_NULL_PARAMETER;
453 reason = ERR_R_MALLOC_FAILURE;
459 public_key = EC_KEY_get0_public_key(x);
460 if (public_key != NULL)
462 if ((pub_key = EC_POINT_point2bn(group, public_key,
463 EC_KEY_get_conv_form(x), NULL, ctx)) == NULL)
465 reason = ERR_R_EC_LIB;
468 buf_len = (size_t)BN_num_bytes(pub_key);
474 priv_key = EC_KEY_get0_private_key(x);
475 if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
484 if ((buffer = OPENSSL_malloc(buf_len)) == NULL)
486 reason = ERR_R_MALLOC_FAILURE;
491 ecstr = "Private-Key";
493 ecstr = "Public-Key";
495 ecstr = "ECDSA-Parameters";
497 if (!BIO_indent(bp, off, 128))
499 if ((order = BN_new()) == NULL)
501 if (!EC_GROUP_get_order(group, order, NULL))
503 if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
504 BN_num_bits(order)) <= 0) goto err;
506 if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
509 if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
512 if (!ECPKParameters_print(bp, group, off))
517 ECerr(EC_F_DO_EC_KEY_PRINT, reason);
525 OPENSSL_free(buffer);
529 static int eckey_param_decode(EVP_PKEY *pkey,
530 const unsigned char **pder, int derlen)
533 if (!(eckey = d2i_ECParameters(NULL, pder, derlen)))
535 ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
538 EVP_PKEY_assign_EC_KEY(pkey, eckey);
542 static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
544 return i2d_ECParameters(pkey->pkey.ec, pder);
547 static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
550 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
553 static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
556 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
560 static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
563 return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
566 static int old_ec_priv_decode(EVP_PKEY *pkey,
567 const unsigned char **pder, int derlen)
570 if (!(ec = d2i_ECPrivateKey (NULL, pder, derlen)))
572 ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
575 EVP_PKEY_assign_EC_KEY(pkey, ec);
579 static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
581 return i2d_ECPrivateKey(pkey->pkey.ec, pder);
584 static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
588 case ASN1_PKEY_CTRL_PKCS7_SIGN:
592 X509_ALGOR *alg1, *alg2;
593 PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
594 if (alg1 == NULL || alg1->algorithm == NULL)
596 hnid = OBJ_obj2nid(alg1->algorithm);
597 if (hnid == NID_undef)
599 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
601 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
604 #ifndef OPENSSL_NO_CMS
605 case ASN1_PKEY_CTRL_CMS_SIGN:
609 X509_ALGOR *alg1, *alg2;
610 CMS_SignerInfo_get0_algs(arg2, NULL, NULL,
612 if (alg1 == NULL || alg1->algorithm == NULL)
614 hnid = OBJ_obj2nid(alg1->algorithm);
615 if (hnid == NID_undef)
617 if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
619 X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
623 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
625 return ecdh_cms_decrypt(arg2);
627 return ecdh_cms_encrypt(arg2);
630 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
631 *(int *)arg2 = CMS_RECIPINFO_AGREE;
635 case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
636 *(int *)arg2 = NID_sha256;
646 const EVP_PKEY_ASN1_METHOD eckey_asn1_meth =
652 "OpenSSL EC algorithm",
668 ec_missing_parameters,
680 #ifndef OPENSSL_NO_CMS
682 static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
683 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
689 EVP_PKEY *pkpeer = NULL;
690 EC_KEY *ecpeer = NULL;
691 const unsigned char *p;
693 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
694 if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
696 /* If absent parameters get group from main key */
697 if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL)
701 pk = EVP_PKEY_CTX_get0_pkey(pctx);
704 grp = EC_KEY_get0_group(pk->pkey.ec);
705 ecpeer = EC_KEY_new();
708 if (!EC_KEY_set_group(ecpeer, grp))
713 ecpeer = eckey_type2param(atype, aval);
717 /* We have parameters now set public key */
718 plen = ASN1_STRING_length(pubkey);
719 p = ASN1_STRING_data(pubkey);
722 if (!o2i_ECPublicKey(&ecpeer, &p, plen))
724 pkpeer = EVP_PKEY_new();
727 EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
728 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
734 EVP_PKEY_free(pkpeer);
737 /* Set KDF parameters based on KDF NID */
738 static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
740 int kdf_nid, kdfmd_nid, cofactor;
741 const EVP_MD *kdf_md;
742 if (eckdf_nid == NID_undef)
745 /* Lookup KDF type, cofactor mode and digest */
746 if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
749 if (kdf_nid == NID_dh_std_kdf)
751 else if (kdf_nid == NID_dh_cofactor_kdf)
755 if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
758 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
761 kdf_md = EVP_get_digestbynid(kdfmd_nid);
765 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
770 static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
774 X509_ALGOR *alg, *kekalg = NULL;
775 ASN1_OCTET_STRING *ukm;
776 const unsigned char *p;
777 unsigned char *der = NULL;
779 const EVP_CIPHER *kekcipher;
780 EVP_CIPHER_CTX *kekctx;
782 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
785 if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm)))
787 ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
791 if (alg->parameter->type != V_ASN1_SEQUENCE)
794 p = alg->parameter->value.sequence->data;
795 plen = alg->parameter->value.sequence->length;
796 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
799 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
802 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
803 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
805 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
807 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
810 keylen = EVP_CIPHER_CTX_key_length(kekctx);
811 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
814 plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
819 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
826 X509_ALGOR_free(kekalg);
832 static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
835 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
838 /* See if we need to set peer key */
839 if (!EVP_PKEY_CTX_get0_peerkey(pctx))
842 ASN1_BIT_STRING *pubkey;
843 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
848 if (!ecdh_cms_set_peerkey(pctx, alg, pubkey))
850 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
854 /* Set ECDH derivation parameters and initialise unwrap context */
855 if (!ecdh_cms_set_shared_info(pctx, ri))
857 ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
863 static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
869 X509_ALGOR *talg, *wrap_alg = NULL;
871 ASN1_BIT_STRING *pubkey;
872 ASN1_STRING *wrap_str;
873 ASN1_OCTET_STRING *ukm;
874 unsigned char *penc = NULL;
877 int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
878 const EVP_MD *kdf_md;
879 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
882 /* Get ephemeral key */
883 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
884 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
887 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
888 /* Is everything uninitialised? */
889 if (aoid == OBJ_nid2obj(NID_undef))
892 EC_KEY *eckey = pkey->pkey.ec;
896 penclen = i2o_ECPublicKey(eckey, NULL);
899 penc = OPENSSL_malloc(penclen);
903 penclen = i2o_ECPublicKey(eckey, &p);
906 ASN1_STRING_set0(pubkey, penc, penclen);
907 pubkey->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
908 pubkey->flags|=ASN1_STRING_FLAG_BITS_LEFT;
911 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
915 /* See if custom paraneters set */
916 kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
919 if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
921 ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
924 else if (ecdh_nid == 0)
925 ecdh_nid = NID_dh_std_kdf;
926 else if (ecdh_nid == 1)
927 ecdh_nid = NID_dh_cofactor_kdf;
929 if (kdf_type == EVP_PKEY_ECDH_KDF_NONE)
931 kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
932 if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
940 /* Fixme later for better MD */
942 if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
946 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
949 /* Lookup NID for KDF+cofactor+digest */
951 if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
954 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
955 wrap_nid = EVP_CIPHER_CTX_type(ctx);
956 keylen = EVP_CIPHER_CTX_key_length(ctx);
958 /* Package wrap algorithm in an AlgorithmIdentifier */
960 wrap_alg = X509_ALGOR_new();
963 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
964 wrap_alg->parameter = ASN1_TYPE_new();
965 if (!wrap_alg->parameter)
967 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
969 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef)
971 ASN1_TYPE_free(wrap_alg->parameter);
972 wrap_alg->parameter = NULL;
975 if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
978 penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
983 if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
987 /* Now need to wrap encoding of wrap AlgorithmIdentifier into
988 * parameter of another AlgorithmIdentifier.
990 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
991 if (!penc || !penclen)
993 wrap_str = ASN1_STRING_new();
996 ASN1_STRING_set0(wrap_str, penc, penclen);
998 X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
1006 X509_ALGOR_free(wrap_alg);