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/asn1.h>
63 #include <openssl/dh.h>
64 #include <openssl/bn.h>
65 #include "asn1_locl.h"
66 #ifndef OPENSSL_NO_CMS
67 # include <openssl/cms.h>
70 extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
;
73 * i2d/d2i like DH parameter functions which use the appropriate routine for
74 * PKCS#3 DH or X9.42 DH.
77 static DH
*d2i_dhp(const EVP_PKEY
*pkey
, const unsigned char **pp
,
80 if (pkey
->ameth
== &dhx_asn1_meth
)
81 return d2i_DHxparams(NULL
, pp
, length
);
82 return d2i_DHparams(NULL
, pp
, length
);
85 static int i2d_dhp(const EVP_PKEY
*pkey
, const DH
*a
, unsigned char **pp
)
87 if (pkey
->ameth
== &dhx_asn1_meth
)
88 return i2d_DHxparams(a
, pp
);
89 return i2d_DHparams(a
, pp
);
92 static void int_dh_free(EVP_PKEY
*pkey
)
94 DH_free(pkey
->pkey
.dh
);
97 static int dh_pub_decode(EVP_PKEY
*pkey
, X509_PUBKEY
*pubkey
)
99 const unsigned char *p
, *pm
;
105 ASN1_INTEGER
*public_key
= NULL
;
109 if (!X509_PUBKEY_get0_param(NULL
, &p
, &pklen
, &palg
, pubkey
))
111 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
113 if (ptype
!= V_ASN1_SEQUENCE
) {
114 DHerr(DH_F_DH_PUB_DECODE
, DH_R_PARAMETER_ENCODING_ERROR
);
120 pmlen
= pstr
->length
;
122 if (!(dh
= d2i_dhp(pkey
, &pm
, pmlen
))) {
123 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
127 if (!(public_key
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
))) {
128 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
132 /* We have parameters now set public key */
133 if (!(dh
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
))) {
134 DHerr(DH_F_DH_PUB_DECODE
, DH_R_BN_DECODE_ERROR
);
138 ASN1_INTEGER_free(public_key
);
139 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
144 ASN1_INTEGER_free(public_key
);
151 static int dh_pub_encode(X509_PUBKEY
*pk
, const EVP_PKEY
*pkey
)
156 unsigned char *penc
= NULL
;
159 ASN1_INTEGER
*pub_key
= NULL
;
163 str
= ASN1_STRING_new();
164 str
->length
= i2d_dhp(pkey
, dh
, &str
->data
);
165 if (str
->length
<= 0) {
166 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
170 ptype
= V_ASN1_SEQUENCE
;
172 pub_key
= BN_to_ASN1_INTEGER(dh
->pub_key
, NULL
);
176 penclen
= i2d_ASN1_INTEGER(pub_key
, &penc
);
178 ASN1_INTEGER_free(pub_key
);
181 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
185 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(pkey
->ameth
->pkey_id
),
186 ptype
, pval
, penc
, penclen
))
193 ASN1_STRING_free(pval
);
199 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
200 * the AlgorithmIdentifier contains the parameters, the private key is
201 * explcitly included and the pubkey must be recalculated.
204 static int dh_priv_decode(EVP_PKEY
*pkey
, PKCS8_PRIV_KEY_INFO
*p8
)
206 const unsigned char *p
, *pm
;
212 ASN1_INTEGER
*privkey
= NULL
;
216 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
219 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
221 if (ptype
!= V_ASN1_SEQUENCE
)
224 if (!(privkey
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
229 pmlen
= pstr
->length
;
230 if (!(dh
= d2i_dhp(pkey
, &pm
, pmlen
)))
232 /* We have parameters now set private key */
233 if (!(dh
->priv_key
= ASN1_INTEGER_to_BN(privkey
, NULL
))) {
234 DHerr(DH_F_DH_PRIV_DECODE
, DH_R_BN_ERROR
);
237 /* Calculate public key */
238 if (!DH_generate_key(dh
))
241 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
243 ASN1_INTEGER_free(privkey
);
248 DHerr(DH_F_DH_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
254 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, const EVP_PKEY
*pkey
)
256 ASN1_STRING
*params
= NULL
;
257 ASN1_INTEGER
*prkey
= NULL
;
258 unsigned char *dp
= NULL
;
261 params
= ASN1_STRING_new();
264 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
268 params
->length
= i2d_dhp(pkey
, pkey
->pkey
.dh
, ¶ms
->data
);
269 if (params
->length
<= 0) {
270 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
273 params
->type
= V_ASN1_SEQUENCE
;
275 /* Get private key into integer */
276 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->priv_key
, NULL
);
279 DHerr(DH_F_DH_PRIV_ENCODE
, DH_R_BN_ERROR
);
283 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
285 ASN1_INTEGER_free(prkey
);
288 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(pkey
->ameth
->pkey_id
), 0,
289 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
298 ASN1_STRING_free(params
);
300 ASN1_INTEGER_free(prkey
);
304 static void update_buflen(const BIGNUM
*b
, size_t *pbuflen
)
309 if (*pbuflen
< (i
= (size_t)BN_num_bytes(b
)))
313 static int dh_param_decode(EVP_PKEY
*pkey
,
314 const unsigned char **pder
, int derlen
)
317 if (!(dh
= d2i_dhp(pkey
, pder
, derlen
))) {
318 DHerr(DH_F_DH_PARAM_DECODE
, ERR_R_DH_LIB
);
321 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
325 static int dh_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
327 return i2d_dhp(pkey
, pkey
->pkey
.dh
, pder
);
330 static int do_dh_print(BIO
*bp
, const DH
*x
, int indent
,
331 ASN1_PCTX
*ctx
, int ptype
)
333 unsigned char *m
= NULL
;
334 int reason
= ERR_R_BUF_LIB
, ret
= 0;
337 const char *ktype
= NULL
;
339 BIGNUM
*priv_key
, *pub_key
;
342 priv_key
= x
->priv_key
;
347 pub_key
= x
->pub_key
;
351 update_buflen(x
->p
, &buf_len
);
354 reason
= ERR_R_PASSED_NULL_PARAMETER
;
358 update_buflen(x
->g
, &buf_len
);
359 update_buflen(x
->q
, &buf_len
);
360 update_buflen(x
->j
, &buf_len
);
361 update_buflen(x
->counter
, &buf_len
);
362 update_buflen(pub_key
, &buf_len
);
363 update_buflen(priv_key
, &buf_len
);
366 ktype
= "DH Private-Key";
368 ktype
= "DH Public-Key";
370 ktype
= "DH Parameters";
372 m
= OPENSSL_malloc(buf_len
+ 10);
374 reason
= ERR_R_MALLOC_FAILURE
;
378 BIO_indent(bp
, indent
, 128);
379 if (BIO_printf(bp
, "%s: (%d bit)\n", ktype
, BN_num_bits(x
->p
)) <= 0)
383 if (!ASN1_bn_print(bp
, "private-key:", priv_key
, m
, indent
))
385 if (!ASN1_bn_print(bp
, "public-key:", pub_key
, m
, indent
))
388 if (!ASN1_bn_print(bp
, "prime:", x
->p
, m
, indent
))
390 if (!ASN1_bn_print(bp
, "generator:", x
->g
, m
, indent
))
392 if (x
->q
&& !ASN1_bn_print(bp
, "subgroup order:", x
->q
, m
, indent
))
394 if (x
->j
&& !ASN1_bn_print(bp
, "subgroup factor:", x
->j
, m
, indent
))
398 BIO_indent(bp
, indent
, 128);
399 BIO_puts(bp
, "seed:");
400 for (i
= 0; i
< x
->seedlen
; i
++) {
402 if (BIO_puts(bp
, "\n") <= 0
403 || !BIO_indent(bp
, indent
+ 4, 128))
406 if (BIO_printf(bp
, "%02x%s", x
->seed
[i
],
407 ((i
+ 1) == x
->seedlen
) ? "" : ":") <= 0)
410 if (BIO_write(bp
, "\n", 1) <= 0)
413 if (x
->counter
&& !ASN1_bn_print(bp
, "counter:", x
->counter
, m
, indent
))
415 if (x
->length
!= 0) {
416 BIO_indent(bp
, indent
, 128);
417 if (BIO_printf(bp
, "recommended-private-length: %d bits\n",
418 (int)x
->length
) <= 0)
425 DHerr(DH_F_DO_DH_PRINT
, reason
);
432 static int int_dh_size(const EVP_PKEY
*pkey
)
434 return (DH_size(pkey
->pkey
.dh
));
437 static int dh_bits(const EVP_PKEY
*pkey
)
439 return BN_num_bits(pkey
->pkey
.dh
->p
);
442 static int dh_security_bits(const EVP_PKEY
*pkey
)
444 return DH_security_bits(pkey
->pkey
.dh
);
447 static int dh_cmp_parameters(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
449 if (BN_cmp(a
->pkey
.dh
->p
, b
->pkey
.dh
->p
) ||
450 BN_cmp(a
->pkey
.dh
->g
, b
->pkey
.dh
->g
))
452 else if (a
->ameth
== &dhx_asn1_meth
) {
453 if (BN_cmp(a
->pkey
.dh
->q
, b
->pkey
.dh
->q
))
459 static int int_dh_bn_cpy(BIGNUM
**dst
, const BIGNUM
*src
)
474 static int int_dh_param_copy(DH
*to
, const DH
*from
, int is_x942
)
477 is_x942
= ! !from
->q
;
478 if (!int_dh_bn_cpy(&to
->p
, from
->p
))
480 if (!int_dh_bn_cpy(&to
->g
, from
->g
))
483 if (!int_dh_bn_cpy(&to
->q
, from
->q
))
485 if (!int_dh_bn_cpy(&to
->j
, from
->j
))
488 OPENSSL_free(to
->seed
);
493 to
->seed
= BUF_memdup(from
->seed
, from
->seedlen
);
496 to
->seedlen
= from
->seedlen
;
499 to
->length
= from
->length
;
503 DH
*DHparams_dup(DH
*dh
)
509 if (!int_dh_param_copy(ret
, dh
, -1)) {
516 static int dh_copy_parameters(EVP_PKEY
*to
, const EVP_PKEY
*from
)
518 return int_dh_param_copy(to
->pkey
.dh
, from
->pkey
.dh
,
519 from
->ameth
== &dhx_asn1_meth
);
522 static int dh_missing_parameters(const EVP_PKEY
*a
)
524 if (!a
->pkey
.dh
->p
|| !a
->pkey
.dh
->g
)
529 static int dh_pub_cmp(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
531 if (dh_cmp_parameters(a
, b
) == 0)
533 if (BN_cmp(b
->pkey
.dh
->pub_key
, a
->pkey
.dh
->pub_key
) != 0)
539 static int dh_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
542 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 0);
545 static int dh_public_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
548 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 1);
551 static int dh_private_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
554 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 2);
557 int DHparams_print(BIO
*bp
, const DH
*x
)
559 return do_dh_print(bp
, x
, 4, NULL
, 0);
562 #ifndef OPENSSL_NO_CMS
563 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
);
564 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
);
567 static int dh_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
570 #ifndef OPENSSL_NO_CMS
572 case ASN1_PKEY_CTRL_CMS_ENVELOPE
:
574 return dh_cms_decrypt(arg2
);
576 return dh_cms_encrypt(arg2
);
579 case ASN1_PKEY_CTRL_CMS_RI_TYPE
:
580 *(int *)arg2
= CMS_RECIPINFO_AGREE
;
589 const EVP_PKEY_ASN1_METHOD dh_asn1_meth
= {
595 "OpenSSL PKCS#3 DH method",
612 dh_missing_parameters
,
622 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
= {
628 "OpenSSL X9.42 DH method",
645 dh_missing_parameters
,
655 #ifndef OPENSSL_NO_CMS
657 static int dh_cms_set_peerkey(EVP_PKEY_CTX
*pctx
,
658 X509_ALGOR
*alg
, ASN1_BIT_STRING
*pubkey
)
663 ASN1_INTEGER
*public_key
= NULL
;
665 EVP_PKEY
*pkpeer
= NULL
, *pk
= NULL
;
667 const unsigned char *p
;
670 X509_ALGOR_get0(&aoid
, &atype
, &aval
, alg
);
671 if (OBJ_obj2nid(aoid
) != NID_dhpublicnumber
)
673 /* Only absent parameters allowed in RFC XXXX */
674 if (atype
!= V_ASN1_UNDEF
&& atype
== V_ASN1_NULL
)
677 pk
= EVP_PKEY_CTX_get0_pkey(pctx
);
680 if (pk
->type
!= EVP_PKEY_DHX
)
682 /* Get parameters from parent key */
683 dhpeer
= DHparams_dup(pk
->pkey
.dh
);
684 /* We have parameters now set public key */
685 plen
= ASN1_STRING_length(pubkey
);
686 p
= ASN1_STRING_data(pubkey
);
690 if (!(public_key
= d2i_ASN1_INTEGER(NULL
, &p
, plen
))) {
691 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_DECODE_ERROR
);
695 /* We have parameters now set public key */
696 if (!(dhpeer
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
))) {
697 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_BN_DECODE_ERROR
);
701 pkpeer
= EVP_PKEY_new();
704 EVP_PKEY_assign(pkpeer
, pk
->ameth
->pkey_id
, dhpeer
);
706 if (EVP_PKEY_derive_set_peer(pctx
, pkpeer
) > 0)
710 ASN1_INTEGER_free(public_key
);
712 EVP_PKEY_free(pkpeer
);
718 static int dh_cms_set_shared_info(EVP_PKEY_CTX
*pctx
, CMS_RecipientInfo
*ri
)
722 X509_ALGOR
*alg
, *kekalg
= NULL
;
723 ASN1_OCTET_STRING
*ukm
;
724 const unsigned char *p
;
725 unsigned char *dukm
= NULL
;
728 const EVP_CIPHER
*kekcipher
;
729 EVP_CIPHER_CTX
*kekctx
;
731 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &alg
, &ukm
))
735 * For DH we only have one OID permissible. If ever any more get defined
736 * we will need something cleverer.
738 if (OBJ_obj2nid(alg
->algorithm
) != NID_id_smime_alg_ESDH
) {
739 DHerr(DH_F_DH_CMS_SET_SHARED_INFO
, DH_R_KDF_PARAMETER_ERROR
);
743 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, EVP_PKEY_DH_KDF_X9_42
) <= 0)
746 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, EVP_sha1()) <= 0)
749 if (alg
->parameter
->type
!= V_ASN1_SEQUENCE
)
752 p
= alg
->parameter
->value
.sequence
->data
;
753 plen
= alg
->parameter
->value
.sequence
->length
;
754 kekalg
= d2i_X509_ALGOR(NULL
, &p
, plen
);
757 kekctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
760 kekcipher
= EVP_get_cipherbyobj(kekalg
->algorithm
);
761 if (!kekcipher
|| EVP_CIPHER_mode(kekcipher
) != EVP_CIPH_WRAP_MODE
)
763 if (!EVP_EncryptInit_ex(kekctx
, kekcipher
, NULL
, NULL
, NULL
))
765 if (EVP_CIPHER_asn1_to_param(kekctx
, kekalg
->parameter
) <= 0)
768 keylen
= EVP_CIPHER_CTX_key_length(kekctx
);
769 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
771 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
772 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
,
773 OBJ_nid2obj(EVP_CIPHER_type(kekcipher
)))
778 dukmlen
= ASN1_STRING_length(ukm
);
779 dukm
= BUF_memdup(ASN1_STRING_data(ukm
), dukmlen
);
784 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
791 X509_ALGOR_free(kekalg
);
797 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
)
800 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
803 /* See if we need to set peer key */
804 if (!EVP_PKEY_CTX_get0_peerkey(pctx
)) {
806 ASN1_BIT_STRING
*pubkey
;
807 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &alg
, &pubkey
,
812 if (!dh_cms_set_peerkey(pctx
, alg
, pubkey
)) {
813 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_PEER_KEY_ERROR
);
817 /* Set DH derivation parameters and initialise unwrap context */
818 if (!dh_cms_set_shared_info(pctx
, ri
)) {
819 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_SHARED_INFO_ERROR
);
825 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
)
831 X509_ALGOR
*talg
, *wrap_alg
= NULL
;
833 ASN1_BIT_STRING
*pubkey
;
834 ASN1_STRING
*wrap_str
;
835 ASN1_OCTET_STRING
*ukm
;
836 unsigned char *penc
= NULL
, *dukm
= NULL
;
840 int kdf_type
, wrap_nid
;
841 const EVP_MD
*kdf_md
;
842 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
845 /* Get ephemeral key */
846 pkey
= EVP_PKEY_CTX_get0_pkey(pctx
);
847 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &talg
, &pubkey
,
850 X509_ALGOR_get0(&aoid
, NULL
, NULL
, talg
);
851 /* Is everything uninitialised? */
852 if (aoid
== OBJ_nid2obj(NID_undef
)) {
854 pubk
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->pub_key
, NULL
);
859 penclen
= i2d_ASN1_INTEGER(pubk
, &penc
);
860 ASN1_INTEGER_free(pubk
);
863 ASN1_STRING_set0(pubkey
, penc
, penclen
);
864 pubkey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
865 pubkey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
868 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_dhpublicnumber
),
872 /* See if custom paraneters set */
873 kdf_type
= EVP_PKEY_CTX_get_dh_kdf_type(pctx
);
876 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx
, &kdf_md
))
879 if (kdf_type
== EVP_PKEY_DH_KDF_NONE
) {
880 kdf_type
= EVP_PKEY_DH_KDF_X9_42
;
881 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, kdf_type
) <= 0)
883 } else if (kdf_type
!= EVP_PKEY_DH_KDF_X9_42
)
886 if (kdf_md
== NULL
) {
887 /* Only SHA1 supported */
889 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, kdf_md
) <= 0)
891 } else if (EVP_MD_type(kdf_md
) != NID_sha1
)
892 /* Unsupported digest */
895 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &talg
, &ukm
))
899 ctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
900 wrap_nid
= EVP_CIPHER_CTX_type(ctx
);
901 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
, OBJ_nid2obj(wrap_nid
)) <= 0)
903 keylen
= EVP_CIPHER_CTX_key_length(ctx
);
905 /* Package wrap algorithm in an AlgorithmIdentifier */
907 wrap_alg
= X509_ALGOR_new();
910 wrap_alg
->algorithm
= OBJ_nid2obj(wrap_nid
);
911 wrap_alg
->parameter
= ASN1_TYPE_new();
912 if (!wrap_alg
->parameter
)
914 if (EVP_CIPHER_param_to_asn1(ctx
, wrap_alg
->parameter
) <= 0)
916 if (ASN1_TYPE_get(wrap_alg
->parameter
) == NID_undef
) {
917 ASN1_TYPE_free(wrap_alg
->parameter
);
918 wrap_alg
->parameter
= NULL
;
921 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
925 dukmlen
= ASN1_STRING_length(ukm
);
926 dukm
= BUF_memdup(ASN1_STRING_data(ukm
), dukmlen
);
931 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
936 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
937 * of another AlgorithmIdentifier.
940 penclen
= i2d_X509_ALGOR(wrap_alg
, &penc
);
941 if (!penc
|| !penclen
)
943 wrap_str
= ASN1_STRING_new();
946 ASN1_STRING_set0(wrap_str
, penc
, penclen
);
948 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_id_smime_alg_ESDH
),
949 V_ASN1_SEQUENCE
, wrap_str
);
957 X509_ALGOR_free(wrap_alg
);