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
= 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
);
507 OPENSSL_free(buffer
);
511 static int eckey_param_decode(EVP_PKEY
*pkey
,
512 const unsigned char **pder
, int derlen
)
515 if (!(eckey
= d2i_ECParameters(NULL
, pder
, derlen
))) {
516 ECerr(EC_F_ECKEY_PARAM_DECODE
, ERR_R_EC_LIB
);
519 EVP_PKEY_assign_EC_KEY(pkey
, eckey
);
523 static int eckey_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
525 return i2d_ECParameters(pkey
->pkey
.ec
, pder
);
528 static int eckey_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
531 return do_EC_KEY_print(bp
, pkey
->pkey
.ec
, indent
, 0);
534 static int eckey_pub_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
537 return do_EC_KEY_print(bp
, pkey
->pkey
.ec
, indent
, 1);
540 static int eckey_priv_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
543 return do_EC_KEY_print(bp
, pkey
->pkey
.ec
, indent
, 2);
546 static int old_ec_priv_decode(EVP_PKEY
*pkey
,
547 const unsigned char **pder
, int derlen
)
550 if (!(ec
= d2i_ECPrivateKey(NULL
, pder
, derlen
))) {
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
);