2 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * DH low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
17 #include "internal/cryptlib.h"
18 #include <openssl/x509.h>
19 #include <openssl/asn1.h>
21 #include <openssl/bn.h>
22 #include "crypto/asn1.h"
23 #include "crypto/dh.h"
24 #include "crypto/evp.h"
25 #include <openssl/cms.h>
26 #include <openssl/core_names.h>
27 #include <openssl/param_build.h>
28 #include "internal/ffc.h"
31 * i2d/d2i like DH parameter functions which use the appropriate routine for
32 * PKCS#3 DH or X9.42 DH.
35 static DH
*d2i_dhp(const EVP_PKEY
*pkey
, const unsigned char **pp
,
38 if (pkey
->ameth
== &dhx_asn1_meth
)
39 return d2i_DHxparams(NULL
, pp
, length
);
40 return d2i_DHparams(NULL
, pp
, length
);
43 static int i2d_dhp(const EVP_PKEY
*pkey
, const DH
*a
, unsigned char **pp
)
45 if (pkey
->ameth
== &dhx_asn1_meth
)
46 return i2d_DHxparams(a
, pp
);
47 return i2d_DHparams(a
, pp
);
50 static void int_dh_free(EVP_PKEY
*pkey
)
52 DH_free(pkey
->pkey
.dh
);
55 static int dh_pub_decode(EVP_PKEY
*pkey
, const X509_PUBKEY
*pubkey
)
57 const unsigned char *p
, *pm
;
61 const ASN1_STRING
*pstr
;
63 ASN1_INTEGER
*public_key
= NULL
;
67 if (!X509_PUBKEY_get0_param(NULL
, &p
, &pklen
, &palg
, pubkey
))
69 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
71 if (ptype
!= V_ASN1_SEQUENCE
) {
72 DHerr(DH_F_DH_PUB_DECODE
, DH_R_PARAMETER_ENCODING_ERROR
);
80 if ((dh
= d2i_dhp(pkey
, &pm
, pmlen
)) == NULL
) {
81 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
85 if ((public_key
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
)) == NULL
) {
86 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
90 /* We have parameters now set public key */
91 if ((dh
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
)) == NULL
) {
92 DHerr(DH_F_DH_PUB_DECODE
, DH_R_BN_DECODE_ERROR
);
96 ASN1_INTEGER_free(public_key
);
97 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
101 ASN1_INTEGER_free(public_key
);
107 static int dh_pub_encode(X509_PUBKEY
*pk
, const EVP_PKEY
*pkey
)
111 unsigned char *penc
= NULL
;
114 ASN1_INTEGER
*pub_key
= NULL
;
118 str
= ASN1_STRING_new();
120 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
123 str
->length
= i2d_dhp(pkey
, dh
, &str
->data
);
124 if (str
->length
<= 0) {
125 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
128 ptype
= V_ASN1_SEQUENCE
;
130 pub_key
= BN_to_ASN1_INTEGER(dh
->pub_key
, NULL
);
134 penclen
= i2d_ASN1_INTEGER(pub_key
, &penc
);
136 ASN1_INTEGER_free(pub_key
);
139 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
143 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(pkey
->ameth
->pkey_id
),
144 ptype
, str
, penc
, penclen
))
149 ASN1_STRING_free(str
);
155 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
156 * the AlgorithmIdentifier contains the parameters, the private key is
157 * explicitly included and the pubkey must be recalculated.
160 static int dh_priv_decode(EVP_PKEY
*pkey
, const PKCS8_PRIV_KEY_INFO
*p8
)
162 const unsigned char *p
, *pm
;
166 const ASN1_STRING
*pstr
;
167 const X509_ALGOR
*palg
;
168 ASN1_INTEGER
*privkey
= NULL
;
171 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
174 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
176 if (ptype
!= V_ASN1_SEQUENCE
)
178 if ((privkey
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
)) == NULL
)
183 pmlen
= pstr
->length
;
184 if ((dh
= d2i_dhp(pkey
, &pm
, pmlen
)) == NULL
)
187 /* We have parameters now set private key */
188 if ((dh
->priv_key
= BN_secure_new()) == NULL
189 || !ASN1_INTEGER_to_BN(privkey
, dh
->priv_key
)) {
190 DHerr(DH_F_DH_PRIV_DECODE
, DH_R_BN_ERROR
);
193 /* Calculate public key, increments dirty_cnt */
194 if (!DH_generate_key(dh
))
197 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
199 ASN1_STRING_clear_free(privkey
);
204 DHerr(DH_F_DH_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
207 ASN1_STRING_clear_free(privkey
);
211 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, const EVP_PKEY
*pkey
)
213 ASN1_STRING
*params
= NULL
;
214 ASN1_INTEGER
*prkey
= NULL
;
215 unsigned char *dp
= NULL
;
218 params
= ASN1_STRING_new();
220 if (params
== NULL
) {
221 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
225 params
->length
= i2d_dhp(pkey
, pkey
->pkey
.dh
, ¶ms
->data
);
226 if (params
->length
<= 0) {
227 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
230 params
->type
= V_ASN1_SEQUENCE
;
232 /* Get private key into integer */
233 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->priv_key
, NULL
);
236 DHerr(DH_F_DH_PRIV_ENCODE
, DH_R_BN_ERROR
);
240 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
242 ASN1_STRING_clear_free(prkey
);
245 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(pkey
->ameth
->pkey_id
), 0,
246 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
253 ASN1_STRING_free(params
);
254 ASN1_STRING_clear_free(prkey
);
258 static int dh_param_decode(EVP_PKEY
*pkey
,
259 const unsigned char **pder
, int derlen
)
263 if ((dh
= d2i_dhp(pkey
, pder
, derlen
)) == NULL
) {
264 DHerr(DH_F_DH_PARAM_DECODE
, ERR_R_DH_LIB
);
268 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
272 static int dh_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
274 return i2d_dhp(pkey
, pkey
->pkey
.dh
, pder
);
277 static int do_dh_print(BIO
*bp
, const DH
*x
, int indent
, int ptype
)
279 int reason
= ERR_R_BUF_LIB
;
280 const char *ktype
= NULL
;
281 BIGNUM
*priv_key
, *pub_key
;
284 priv_key
= x
->priv_key
;
289 pub_key
= x
->pub_key
;
293 if (x
->params
.p
== NULL
|| (ptype
== 2 && priv_key
== NULL
)
294 || (ptype
> 0 && pub_key
== NULL
)) {
295 reason
= ERR_R_PASSED_NULL_PARAMETER
;
300 ktype
= "DH Private-Key";
302 ktype
= "DH Public-Key";
304 ktype
= "DH Parameters";
306 if (!BIO_indent(bp
, indent
, 128)
307 || BIO_printf(bp
, "%s: (%d bit)\n", ktype
, DH_bits(x
)) <= 0)
311 if (!ASN1_bn_print(bp
, "private-key:", priv_key
, NULL
, indent
))
313 if (!ASN1_bn_print(bp
, "public-key:", pub_key
, NULL
, indent
))
316 if (!ffc_params_print(bp
, &x
->params
, indent
))
319 if (x
->length
!= 0) {
320 if (!BIO_indent(bp
, indent
, 128)
321 || BIO_printf(bp
, "recommended-private-length: %d bits\n",
322 (int)x
->length
) <= 0)
329 DHerr(DH_F_DO_DH_PRINT
, reason
);
333 static int int_dh_size(const EVP_PKEY
*pkey
)
335 return DH_size(pkey
->pkey
.dh
);
338 static int dh_bits(const EVP_PKEY
*pkey
)
340 return DH_bits(pkey
->pkey
.dh
);
343 static int dh_security_bits(const EVP_PKEY
*pkey
)
345 return DH_security_bits(pkey
->pkey
.dh
);
348 static int dh_cmp_parameters(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
350 return ffc_params_cmp(&a
->pkey
.dh
->params
, &a
->pkey
.dh
->params
,
351 a
->ameth
!= &dhx_asn1_meth
);
354 static int int_dh_param_copy(DH
*to
, const DH
*from
, int is_x942
)
357 is_x942
= (from
->params
.q
!= NULL
);
358 if (!ffc_params_copy(&to
->params
, &from
->params
))
361 to
->length
= from
->length
;
366 DH
*DHparams_dup(const DH
*dh
)
372 if (!int_dh_param_copy(ret
, dh
, -1)) {
379 static int dh_copy_parameters(EVP_PKEY
*to
, const EVP_PKEY
*from
)
381 if (to
->pkey
.dh
== NULL
) {
382 to
->pkey
.dh
= DH_new();
383 if (to
->pkey
.dh
== NULL
)
386 return int_dh_param_copy(to
->pkey
.dh
, from
->pkey
.dh
,
387 from
->ameth
== &dhx_asn1_meth
);
390 static int dh_missing_parameters(const EVP_PKEY
*a
)
392 return a
->pkey
.dh
== NULL
393 || a
->pkey
.dh
->params
.p
== NULL
394 || a
->pkey
.dh
->params
.g
== NULL
;
397 static int dh_pub_cmp(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
399 if (dh_cmp_parameters(a
, b
) == 0)
401 if (BN_cmp(b
->pkey
.dh
->pub_key
, a
->pkey
.dh
->pub_key
) != 0)
407 static int dh_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
410 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, 0);
413 static int dh_public_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
416 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, 1);
419 static int dh_private_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
422 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, 2);
425 int DHparams_print(BIO
*bp
, const DH
*x
)
427 return do_dh_print(bp
, x
, 4, 0);
430 #ifndef OPENSSL_NO_CMS
431 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
);
432 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
);
435 static int dh_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
438 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT
:
439 return dh_buf2key(EVP_PKEY_get0_DH(pkey
), arg2
, arg1
);
440 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT
:
441 return dh_key2buf(EVP_PKEY_get0_DH(pkey
), arg2
);
447 static int dhx_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
450 #ifndef OPENSSL_NO_CMS
452 case ASN1_PKEY_CTRL_CMS_ENVELOPE
:
454 return dh_cms_decrypt(arg2
);
456 return dh_cms_encrypt(arg2
);
459 case ASN1_PKEY_CTRL_CMS_RI_TYPE
:
460 *(int *)arg2
= CMS_RECIPINFO_AGREE
;
469 static int dh_pkey_public_check(const EVP_PKEY
*pkey
)
471 DH
*dh
= pkey
->pkey
.dh
;
473 if (dh
->pub_key
== NULL
) {
474 DHerr(DH_F_DH_PKEY_PUBLIC_CHECK
, DH_R_MISSING_PUBKEY
);
478 return DH_check_pub_key_ex(dh
, dh
->pub_key
);
481 static int dh_pkey_param_check(const EVP_PKEY
*pkey
)
483 DH
*dh
= pkey
->pkey
.dh
;
485 return DH_check_ex(dh
);
488 static size_t dh_pkey_dirty_cnt(const EVP_PKEY
*pkey
)
490 return pkey
->pkey
.dh
->dirty_cnt
;
493 static int dh_pkey_export_to(const EVP_PKEY
*from
, void *to_keydata
,
494 EVP_KEYMGMT
*to_keymgmt
, OPENSSL_CTX
*libctx
,
497 DH
*dh
= from
->pkey
.dh
;
498 OSSL_PARAM_BLD
*tmpl
;
499 const BIGNUM
*p
= DH_get0_p(dh
), *g
= DH_get0_g(dh
), *q
= DH_get0_q(dh
);
500 const BIGNUM
*pub_key
= DH_get0_pub_key(dh
);
501 const BIGNUM
*priv_key
= DH_get0_priv_key(dh
);
502 OSSL_PARAM
*params
= NULL
;
507 * If the DH method is foreign, then we can't be sure of anything, and
508 * can therefore not export or pretend to export.
510 if (dh_get_method(dh
) != DH_OpenSSL())
513 if (p
== NULL
|| g
== NULL
)
516 tmpl
= OSSL_PARAM_BLD_new();
519 if (!OSSL_PARAM_BLD_push_BN(tmpl
, OSSL_PKEY_PARAM_FFC_P
, p
)
520 || !OSSL_PARAM_BLD_push_BN(tmpl
, OSSL_PKEY_PARAM_FFC_G
, g
))
523 if (!OSSL_PARAM_BLD_push_BN(tmpl
, OSSL_PKEY_PARAM_FFC_Q
, q
))
526 selection
|= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS
;
527 if (pub_key
!= NULL
) {
528 if (!OSSL_PARAM_BLD_push_BN(tmpl
, OSSL_PKEY_PARAM_PUB_KEY
, pub_key
))
530 selection
|= OSSL_KEYMGMT_SELECT_PUBLIC_KEY
;
532 if (priv_key
!= NULL
) {
533 if (!OSSL_PARAM_BLD_push_BN(tmpl
, OSSL_PKEY_PARAM_PRIV_KEY
,
536 selection
|= OSSL_KEYMGMT_SELECT_PRIVATE_KEY
;
539 if ((params
= OSSL_PARAM_BLD_to_param(tmpl
)) == NULL
)
542 /* We export, the provider imports */
543 rv
= evp_keymgmt_import(to_keymgmt
, to_keydata
, selection
, params
);
545 OSSL_PARAM_BLD_free_params(params
);
547 OSSL_PARAM_BLD_free(tmpl
);
551 static int dh_pkey_import_from(const OSSL_PARAM params
[], void *vpctx
)
553 EVP_PKEY_CTX
*pctx
= vpctx
;
554 EVP_PKEY
*pkey
= EVP_PKEY_CTX_get0_pkey(pctx
);
555 DH
*dh
= dh_new_with_libctx(pctx
->libctx
);
558 ERR_raise(ERR_LIB_DH
, ERR_R_MALLOC_FAILURE
);
562 if (!dh_ffc_params_fromdata(dh
, params
)
563 || !dh_key_fromdata(dh
, params
)
564 || !EVP_PKEY_assign_DH(pkey
, dh
)) {
571 const EVP_PKEY_ASN1_METHOD dh_asn1_meth
= {
577 "OpenSSL PKCS#3 DH method",
594 dh_missing_parameters
,
606 dh_pkey_public_check
,
616 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
= {
622 "OpenSSL X9.42 DH method",
639 dh_missing_parameters
,
651 dh_pkey_public_check
,
655 #ifndef OPENSSL_NO_CMS
657 static int dh_cms_set_peerkey(EVP_PKEY_CTX
*pctx
,
658 X509_ALGOR
*alg
, ASN1_BIT_STRING
*pubkey
)
660 const ASN1_OBJECT
*aoid
;
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_get0_data(pubkey
);
687 if (p
== NULL
|| plen
== 0)
690 if ((public_key
= d2i_ASN1_INTEGER(NULL
, &p
, plen
)) == NULL
) {
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
)) == 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)
709 ASN1_INTEGER_free(public_key
);
710 EVP_PKEY_free(pkpeer
);
715 static int dh_cms_set_shared_info(EVP_PKEY_CTX
*pctx
, CMS_RecipientInfo
*ri
)
719 X509_ALGOR
*alg
, *kekalg
= NULL
;
720 ASN1_OCTET_STRING
*ukm
;
721 const unsigned char *p
;
722 unsigned char *dukm
= NULL
;
725 const EVP_CIPHER
*kekcipher
;
726 EVP_CIPHER_CTX
*kekctx
;
728 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &alg
, &ukm
))
732 * For DH we only have one OID permissible. If ever any more get defined
733 * we will need something cleverer.
735 if (OBJ_obj2nid(alg
->algorithm
) != NID_id_smime_alg_ESDH
) {
736 DHerr(DH_F_DH_CMS_SET_SHARED_INFO
, DH_R_KDF_PARAMETER_ERROR
);
740 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, EVP_PKEY_DH_KDF_X9_42
) <= 0)
743 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, EVP_sha1()) <= 0)
746 if (alg
->parameter
->type
!= V_ASN1_SEQUENCE
)
749 p
= alg
->parameter
->value
.sequence
->data
;
750 plen
= alg
->parameter
->value
.sequence
->length
;
751 kekalg
= d2i_X509_ALGOR(NULL
, &p
, plen
);
754 kekctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
757 kekcipher
= EVP_get_cipherbyobj(kekalg
->algorithm
);
758 if (!kekcipher
|| EVP_CIPHER_mode(kekcipher
) != EVP_CIPH_WRAP_MODE
)
760 if (!EVP_EncryptInit_ex(kekctx
, kekcipher
, NULL
, NULL
, NULL
))
762 if (EVP_CIPHER_asn1_to_param(kekctx
, kekalg
->parameter
) <= 0)
765 keylen
= EVP_CIPHER_CTX_key_length(kekctx
);
766 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
768 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
769 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
,
770 OBJ_nid2obj(EVP_CIPHER_type(kekcipher
)))
775 dukmlen
= ASN1_STRING_length(ukm
);
776 dukm
= OPENSSL_memdup(ASN1_STRING_get0_data(ukm
), dukmlen
);
781 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
787 X509_ALGOR_free(kekalg
);
792 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
)
796 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
800 /* See if we need to set peer key */
801 if (!EVP_PKEY_CTX_get0_peerkey(pctx
)) {
803 ASN1_BIT_STRING
*pubkey
;
804 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &alg
, &pubkey
,
809 if (!dh_cms_set_peerkey(pctx
, alg
, pubkey
)) {
810 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_PEER_KEY_ERROR
);
814 /* Set DH derivation parameters and initialise unwrap context */
815 if (!dh_cms_set_shared_info(pctx
, ri
)) {
816 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_SHARED_INFO_ERROR
);
822 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
)
828 X509_ALGOR
*talg
, *wrap_alg
= NULL
;
829 const ASN1_OBJECT
*aoid
;
830 ASN1_BIT_STRING
*pubkey
;
831 ASN1_STRING
*wrap_str
;
832 ASN1_OCTET_STRING
*ukm
;
833 unsigned char *penc
= NULL
, *dukm
= NULL
;
837 int kdf_type
, wrap_nid
;
838 const EVP_MD
*kdf_md
;
840 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
843 /* Get ephemeral key */
844 pkey
= EVP_PKEY_CTX_get0_pkey(pctx
);
845 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &talg
, &pubkey
,
848 X509_ALGOR_get0(&aoid
, NULL
, NULL
, talg
);
849 /* Is everything uninitialised? */
850 if (aoid
== OBJ_nid2obj(NID_undef
)) {
851 ASN1_INTEGER
*pubk
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->pub_key
, NULL
);
857 penclen
= i2d_ASN1_INTEGER(pubk
, &penc
);
858 ASN1_INTEGER_free(pubk
);
861 ASN1_STRING_set0(pubkey
, penc
, penclen
);
862 pubkey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
863 pubkey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
866 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_dhpublicnumber
),
870 /* See if custom parameters set */
871 kdf_type
= EVP_PKEY_CTX_get_dh_kdf_type(pctx
);
874 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx
, &kdf_md
))
877 if (kdf_type
== EVP_PKEY_DH_KDF_NONE
) {
878 kdf_type
= EVP_PKEY_DH_KDF_X9_42
;
879 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, kdf_type
) <= 0)
881 } else if (kdf_type
!= EVP_PKEY_DH_KDF_X9_42
)
884 if (kdf_md
== NULL
) {
885 /* Only SHA1 supported */
887 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, kdf_md
) <= 0)
889 } else if (EVP_MD_type(kdf_md
) != NID_sha1
)
890 /* Unsupported digest */
893 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &talg
, &ukm
))
897 ctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
898 wrap_nid
= EVP_CIPHER_CTX_type(ctx
);
899 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
, OBJ_nid2obj(wrap_nid
)) <= 0)
901 keylen
= EVP_CIPHER_CTX_key_length(ctx
);
903 /* Package wrap algorithm in an AlgorithmIdentifier */
905 wrap_alg
= X509_ALGOR_new();
906 if (wrap_alg
== NULL
)
908 wrap_alg
->algorithm
= OBJ_nid2obj(wrap_nid
);
909 wrap_alg
->parameter
= ASN1_TYPE_new();
910 if (wrap_alg
->parameter
== NULL
)
912 if (EVP_CIPHER_param_to_asn1(ctx
, wrap_alg
->parameter
) <= 0)
914 if (ASN1_TYPE_get(wrap_alg
->parameter
) == NID_undef
) {
915 ASN1_TYPE_free(wrap_alg
->parameter
);
916 wrap_alg
->parameter
= NULL
;
919 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
923 dukmlen
= ASN1_STRING_length(ukm
);
924 dukm
= OPENSSL_memdup(ASN1_STRING_get0_data(ukm
), dukmlen
);
929 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
934 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
935 * of another AlgorithmIdentifier.
938 penclen
= i2d_X509_ALGOR(wrap_alg
, &penc
);
939 if (penc
== NULL
|| penclen
== 0)
941 wrap_str
= ASN1_STRING_new();
942 if (wrap_str
== NULL
)
944 ASN1_STRING_set0(wrap_str
, penc
, penclen
);
946 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_id_smime_alg_ESDH
),
947 V_ASN1_SEQUENCE
, wrap_str
);
953 X509_ALGOR_free(wrap_alg
);