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
)
155 unsigned char *penc
= NULL
;
158 ASN1_INTEGER
*pub_key
= NULL
;
162 str
= ASN1_STRING_new();
164 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
167 str
->length
= i2d_dhp(pkey
, dh
, &str
->data
);
168 if (str
->length
<= 0) {
169 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
172 ptype
= V_ASN1_SEQUENCE
;
174 pub_key
= BN_to_ASN1_INTEGER(dh
->pub_key
, NULL
);
178 penclen
= i2d_ASN1_INTEGER(pub_key
, &penc
);
180 ASN1_INTEGER_free(pub_key
);
183 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
187 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(pkey
->ameth
->pkey_id
),
188 ptype
, str
, penc
, penclen
))
195 ASN1_STRING_free(str
);
201 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
202 * the AlgorithmIdentifier contains the paramaters, the private key is
203 * explcitly included and the pubkey must be recalculated.
206 static int dh_priv_decode(EVP_PKEY
*pkey
, PKCS8_PRIV_KEY_INFO
*p8
)
208 const unsigned char *p
, *pm
;
214 ASN1_INTEGER
*privkey
= NULL
;
218 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
221 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
223 if (ptype
!= V_ASN1_SEQUENCE
)
226 if (!(privkey
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
231 pmlen
= pstr
->length
;
232 if (!(dh
= d2i_dhp(pkey
, &pm
, pmlen
)))
234 /* We have parameters now set private key */
235 if (!(dh
->priv_key
= ASN1_INTEGER_to_BN(privkey
, NULL
))) {
236 DHerr(DH_F_DH_PRIV_DECODE
, DH_R_BN_ERROR
);
239 /* Calculate public key */
240 if (!DH_generate_key(dh
))
243 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
245 ASN1_STRING_clear_free(privkey
);
250 DHerr(DH_F_DH_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
253 ASN1_STRING_clear_free(privkey
);
257 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, const EVP_PKEY
*pkey
)
259 ASN1_STRING
*params
= NULL
;
260 ASN1_INTEGER
*prkey
= NULL
;
261 unsigned char *dp
= NULL
;
264 params
= ASN1_STRING_new();
267 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
271 params
->length
= i2d_dhp(pkey
, pkey
->pkey
.dh
, ¶ms
->data
);
272 if (params
->length
<= 0) {
273 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
276 params
->type
= V_ASN1_SEQUENCE
;
278 /* Get private key into integer */
279 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->priv_key
, NULL
);
282 DHerr(DH_F_DH_PRIV_ENCODE
, DH_R_BN_ERROR
);
286 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
288 ASN1_STRING_clear_free(prkey
);
291 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(pkey
->ameth
->pkey_id
), 0,
292 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
301 ASN1_STRING_free(params
);
303 ASN1_STRING_clear_free(prkey
);
307 static void update_buflen(const BIGNUM
*b
, size_t *pbuflen
)
312 if (*pbuflen
< (i
= (size_t)BN_num_bytes(b
)))
316 static int dh_param_decode(EVP_PKEY
*pkey
,
317 const unsigned char **pder
, int derlen
)
320 if (!(dh
= d2i_dhp(pkey
, pder
, derlen
))) {
321 DHerr(DH_F_DH_PARAM_DECODE
, ERR_R_DH_LIB
);
324 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
328 static int dh_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
330 return i2d_dhp(pkey
, pkey
->pkey
.dh
, pder
);
333 static int do_dh_print(BIO
*bp
, const DH
*x
, int indent
,
334 ASN1_PCTX
*ctx
, int ptype
)
336 unsigned char *m
= NULL
;
337 int reason
= ERR_R_BUF_LIB
, ret
= 0;
340 const char *ktype
= NULL
;
342 BIGNUM
*priv_key
, *pub_key
;
345 priv_key
= x
->priv_key
;
350 pub_key
= x
->pub_key
;
354 update_buflen(x
->p
, &buf_len
);
357 reason
= ERR_R_PASSED_NULL_PARAMETER
;
361 update_buflen(x
->g
, &buf_len
);
362 update_buflen(x
->q
, &buf_len
);
363 update_buflen(x
->j
, &buf_len
);
364 update_buflen(x
->counter
, &buf_len
);
365 update_buflen(pub_key
, &buf_len
);
366 update_buflen(priv_key
, &buf_len
);
369 ktype
= "DH Private-Key";
371 ktype
= "DH Public-Key";
373 ktype
= "DH Parameters";
375 m
= OPENSSL_malloc(buf_len
+ 10);
377 reason
= ERR_R_MALLOC_FAILURE
;
381 BIO_indent(bp
, indent
, 128);
382 if (BIO_printf(bp
, "%s: (%d bit)\n", ktype
, BN_num_bits(x
->p
)) <= 0)
386 if (!ASN1_bn_print(bp
, "private-key:", priv_key
, m
, indent
))
388 if (!ASN1_bn_print(bp
, "public-key:", pub_key
, m
, indent
))
391 if (!ASN1_bn_print(bp
, "prime:", x
->p
, m
, indent
))
393 if (!ASN1_bn_print(bp
, "generator:", x
->g
, m
, indent
))
395 if (x
->q
&& !ASN1_bn_print(bp
, "subgroup order:", x
->q
, m
, indent
))
397 if (x
->j
&& !ASN1_bn_print(bp
, "subgroup factor:", x
->j
, m
, indent
))
401 BIO_indent(bp
, indent
, 128);
402 BIO_puts(bp
, "seed:");
403 for (i
= 0; i
< x
->seedlen
; i
++) {
405 if (BIO_puts(bp
, "\n") <= 0
406 || !BIO_indent(bp
, indent
+ 4, 128))
409 if (BIO_printf(bp
, "%02x%s", x
->seed
[i
],
410 ((i
+ 1) == x
->seedlen
) ? "" : ":") <= 0)
413 if (BIO_write(bp
, "\n", 1) <= 0)
416 if (x
->counter
&& !ASN1_bn_print(bp
, "counter:", x
->counter
, m
, indent
))
418 if (x
->length
!= 0) {
419 BIO_indent(bp
, indent
, 128);
420 if (BIO_printf(bp
, "recommended-private-length: %d bits\n",
421 (int)x
->length
) <= 0)
428 DHerr(DH_F_DO_DH_PRINT
, reason
);
435 static int int_dh_size(const EVP_PKEY
*pkey
)
437 return (DH_size(pkey
->pkey
.dh
));
440 static int dh_bits(const EVP_PKEY
*pkey
)
442 return BN_num_bits(pkey
->pkey
.dh
->p
);
445 static int dh_cmp_parameters(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
447 if (BN_cmp(a
->pkey
.dh
->p
, b
->pkey
.dh
->p
) ||
448 BN_cmp(a
->pkey
.dh
->g
, b
->pkey
.dh
->g
))
450 else if (a
->ameth
== &dhx_asn1_meth
) {
451 if (BN_cmp(a
->pkey
.dh
->q
, b
->pkey
.dh
->q
))
457 static int int_dh_bn_cpy(BIGNUM
**dst
, const BIGNUM
*src
)
472 static int int_dh_param_copy(DH
*to
, const DH
*from
, int is_x942
)
475 is_x942
= ! !from
->q
;
476 if (!int_dh_bn_cpy(&to
->p
, from
->p
))
478 if (!int_dh_bn_cpy(&to
->g
, from
->g
))
481 if (!int_dh_bn_cpy(&to
->q
, from
->q
))
483 if (!int_dh_bn_cpy(&to
->j
, from
->j
))
486 OPENSSL_free(to
->seed
);
491 to
->seed
= BUF_memdup(from
->seed
, from
->seedlen
);
494 to
->seedlen
= from
->seedlen
;
497 to
->length
= from
->length
;
501 DH
*DHparams_dup(DH
*dh
)
507 if (!int_dh_param_copy(ret
, dh
, -1)) {
514 static int dh_copy_parameters(EVP_PKEY
*to
, const EVP_PKEY
*from
)
516 return int_dh_param_copy(to
->pkey
.dh
, from
->pkey
.dh
,
517 from
->ameth
== &dhx_asn1_meth
);
520 static int dh_missing_parameters(const EVP_PKEY
*a
)
522 if (!a
->pkey
.dh
->p
|| !a
->pkey
.dh
->g
)
527 static int dh_pub_cmp(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
529 if (dh_cmp_parameters(a
, b
) == 0)
531 if (BN_cmp(b
->pkey
.dh
->pub_key
, a
->pkey
.dh
->pub_key
) != 0)
537 static int dh_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
540 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 0);
543 static int dh_public_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
546 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 1);
549 static int dh_private_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
552 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 2);
555 int DHparams_print(BIO
*bp
, const DH
*x
)
557 return do_dh_print(bp
, x
, 4, NULL
, 0);
560 #ifndef OPENSSL_NO_CMS
561 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
);
562 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
);
565 static int dh_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
568 #ifndef OPENSSL_NO_CMS
570 case ASN1_PKEY_CTRL_CMS_ENVELOPE
:
572 return dh_cms_decrypt(arg2
);
574 return dh_cms_encrypt(arg2
);
577 case ASN1_PKEY_CTRL_CMS_RI_TYPE
:
578 *(int *)arg2
= CMS_RECIPINFO_AGREE
;
587 const EVP_PKEY_ASN1_METHOD dh_asn1_meth
= {
593 "OpenSSL PKCS#3 DH method",
609 dh_missing_parameters
,
619 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
= {
625 "OpenSSL X9.42 DH method",
641 dh_missing_parameters
,
651 #ifndef OPENSSL_NO_CMS
653 static int dh_cms_set_peerkey(EVP_PKEY_CTX
*pctx
,
654 X509_ALGOR
*alg
, ASN1_BIT_STRING
*pubkey
)
659 ASN1_INTEGER
*public_key
= NULL
;
661 EVP_PKEY
*pkpeer
= NULL
, *pk
= NULL
;
663 const unsigned char *p
;
666 X509_ALGOR_get0(&aoid
, &atype
, &aval
, alg
);
667 if (OBJ_obj2nid(aoid
) != NID_dhpublicnumber
)
669 /* Only absent parameters allowed in RFC XXXX */
670 if (atype
!= V_ASN1_UNDEF
&& atype
== V_ASN1_NULL
)
673 pk
= EVP_PKEY_CTX_get0_pkey(pctx
);
676 if (pk
->type
!= EVP_PKEY_DHX
)
678 /* Get parameters from parent key */
679 dhpeer
= DHparams_dup(pk
->pkey
.dh
);
680 /* We have parameters now set public key */
681 plen
= ASN1_STRING_length(pubkey
);
682 p
= ASN1_STRING_data(pubkey
);
686 if (!(public_key
= d2i_ASN1_INTEGER(NULL
, &p
, plen
))) {
687 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_DECODE_ERROR
);
691 /* We have parameters now set public key */
692 if (!(dhpeer
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
))) {
693 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_BN_DECODE_ERROR
);
697 pkpeer
= EVP_PKEY_new();
700 EVP_PKEY_assign(pkpeer
, pk
->ameth
->pkey_id
, dhpeer
);
702 if (EVP_PKEY_derive_set_peer(pctx
, pkpeer
) > 0)
706 ASN1_INTEGER_free(public_key
);
708 EVP_PKEY_free(pkpeer
);
714 static int dh_cms_set_shared_info(EVP_PKEY_CTX
*pctx
, CMS_RecipientInfo
*ri
)
718 X509_ALGOR
*alg
, *kekalg
= NULL
;
719 ASN1_OCTET_STRING
*ukm
;
720 const unsigned char *p
;
721 unsigned char *dukm
= NULL
;
724 const EVP_CIPHER
*kekcipher
;
725 EVP_CIPHER_CTX
*kekctx
;
727 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &alg
, &ukm
))
731 * For DH we only have one OID permissible. If ever any more get defined
732 * we will need something cleverer.
734 if (OBJ_obj2nid(alg
->algorithm
) != NID_id_smime_alg_ESDH
) {
735 DHerr(DH_F_DH_CMS_SET_SHARED_INFO
, DH_R_KDF_PARAMETER_ERROR
);
739 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, EVP_PKEY_DH_KDF_X9_42
) <= 0)
742 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, EVP_sha1()) <= 0)
745 if (alg
->parameter
->type
!= V_ASN1_SEQUENCE
)
748 p
= alg
->parameter
->value
.sequence
->data
;
749 plen
= alg
->parameter
->value
.sequence
->length
;
750 kekalg
= d2i_X509_ALGOR(NULL
, &p
, plen
);
753 kekctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
756 kekcipher
= EVP_get_cipherbyobj(kekalg
->algorithm
);
757 if (!kekcipher
|| EVP_CIPHER_mode(kekcipher
) != EVP_CIPH_WRAP_MODE
)
759 if (!EVP_EncryptInit_ex(kekctx
, kekcipher
, NULL
, NULL
, NULL
))
761 if (EVP_CIPHER_asn1_to_param(kekctx
, kekalg
->parameter
) <= 0)
764 keylen
= EVP_CIPHER_CTX_key_length(kekctx
);
765 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
767 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
768 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
,
769 OBJ_nid2obj(EVP_CIPHER_type(kekcipher
)))
774 dukmlen
= ASN1_STRING_length(ukm
);
775 dukm
= BUF_memdup(ASN1_STRING_data(ukm
), dukmlen
);
780 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
787 X509_ALGOR_free(kekalg
);
793 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
)
796 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
799 /* See if we need to set peer key */
800 if (!EVP_PKEY_CTX_get0_peerkey(pctx
)) {
802 ASN1_BIT_STRING
*pubkey
;
803 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &alg
, &pubkey
,
808 if (!dh_cms_set_peerkey(pctx
, alg
, pubkey
)) {
809 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_PEER_KEY_ERROR
);
813 /* Set DH derivation parameters and initialise unwrap context */
814 if (!dh_cms_set_shared_info(pctx
, ri
)) {
815 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_SHARED_INFO_ERROR
);
821 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
)
827 X509_ALGOR
*talg
, *wrap_alg
= NULL
;
829 ASN1_BIT_STRING
*pubkey
;
830 ASN1_STRING
*wrap_str
;
831 ASN1_OCTET_STRING
*ukm
;
832 unsigned char *penc
= NULL
, *dukm
= NULL
;
836 int kdf_type
, wrap_nid
;
837 const EVP_MD
*kdf_md
;
838 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
841 /* Get ephemeral key */
842 pkey
= EVP_PKEY_CTX_get0_pkey(pctx
);
843 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &talg
, &pubkey
,
846 X509_ALGOR_get0(&aoid
, NULL
, NULL
, talg
);
847 /* Is everything uninitialised? */
848 if (aoid
== OBJ_nid2obj(NID_undef
)) {
850 pubk
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->pub_key
, NULL
);
855 penclen
= i2d_ASN1_INTEGER(pubk
, &penc
);
856 ASN1_INTEGER_free(pubk
);
859 ASN1_STRING_set0(pubkey
, penc
, penclen
);
860 pubkey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
861 pubkey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
864 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_dhpublicnumber
),
868 /* See if custom paraneters set */
869 kdf_type
= EVP_PKEY_CTX_get_dh_kdf_type(pctx
);
872 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx
, &kdf_md
))
875 if (kdf_type
== EVP_PKEY_DH_KDF_NONE
) {
876 kdf_type
= EVP_PKEY_DH_KDF_X9_42
;
877 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, kdf_type
) <= 0)
879 } else if (kdf_type
!= EVP_PKEY_DH_KDF_X9_42
)
882 if (kdf_md
== NULL
) {
883 /* Only SHA1 supported */
885 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, kdf_md
) <= 0)
887 } else if (EVP_MD_type(kdf_md
) != NID_sha1
)
888 /* Unsupported digest */
891 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &talg
, &ukm
))
895 ctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
896 wrap_nid
= EVP_CIPHER_CTX_type(ctx
);
897 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
, OBJ_nid2obj(wrap_nid
)) <= 0)
899 keylen
= EVP_CIPHER_CTX_key_length(ctx
);
901 /* Package wrap algorithm in an AlgorithmIdentifier */
903 wrap_alg
= X509_ALGOR_new();
906 wrap_alg
->algorithm
= OBJ_nid2obj(wrap_nid
);
907 wrap_alg
->parameter
= ASN1_TYPE_new();
908 if (!wrap_alg
->parameter
)
910 if (EVP_CIPHER_param_to_asn1(ctx
, wrap_alg
->parameter
) <= 0)
912 if (ASN1_TYPE_get(wrap_alg
->parameter
) == NID_undef
) {
913 ASN1_TYPE_free(wrap_alg
->parameter
);
914 wrap_alg
->parameter
= NULL
;
917 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
921 dukmlen
= ASN1_STRING_length(ukm
);
922 dukm
= BUF_memdup(ASN1_STRING_data(ukm
), dukmlen
);
927 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
932 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
933 * of another AlgorithmIdentifier.
936 penclen
= i2d_X509_ALGOR(wrap_alg
, &penc
);
937 if (!penc
|| !penclen
)
939 wrap_str
= ASN1_STRING_new();
942 ASN1_STRING_set0(wrap_str
, penc
, penclen
);
944 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_id_smime_alg_ESDH
),
945 V_ASN1_SEQUENCE
, wrap_str
);
953 X509_ALGOR_free(wrap_alg
);