2 * Copyright 2006-2016 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 #include "internal/cryptlib.h"
12 #include <openssl/x509.h>
13 #include <openssl/asn1.h>
15 #include <openssl/bn.h>
16 #include "internal/asn1_int.h"
17 #include "internal/evp_int.h"
18 #include <openssl/cms.h>
19 #include <openssl/core_names.h>
20 #include "internal/param_build.h"
23 * i2d/d2i like DH parameter functions which use the appropriate routine for
24 * PKCS#3 DH or X9.42 DH.
27 static DH
*d2i_dhp(const EVP_PKEY
*pkey
, const unsigned char **pp
,
30 if (pkey
->ameth
== &dhx_asn1_meth
)
31 return d2i_DHxparams(NULL
, pp
, length
);
32 return d2i_DHparams(NULL
, pp
, length
);
35 static int i2d_dhp(const EVP_PKEY
*pkey
, const DH
*a
, unsigned char **pp
)
37 if (pkey
->ameth
== &dhx_asn1_meth
)
38 return i2d_DHxparams(a
, pp
);
39 return i2d_DHparams(a
, pp
);
42 static void int_dh_free(EVP_PKEY
*pkey
)
44 DH_free(pkey
->pkey
.dh
);
47 static int dh_pub_decode(EVP_PKEY
*pkey
, X509_PUBKEY
*pubkey
)
49 const unsigned char *p
, *pm
;
53 const ASN1_STRING
*pstr
;
55 ASN1_INTEGER
*public_key
= NULL
;
59 if (!X509_PUBKEY_get0_param(NULL
, &p
, &pklen
, &palg
, pubkey
))
61 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
63 if (ptype
!= V_ASN1_SEQUENCE
) {
64 DHerr(DH_F_DH_PUB_DECODE
, DH_R_PARAMETER_ENCODING_ERROR
);
72 if ((dh
= d2i_dhp(pkey
, &pm
, pmlen
)) == NULL
) {
73 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
77 if ((public_key
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
)) == NULL
) {
78 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
82 /* We have parameters now set public key */
83 if ((dh
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
)) == NULL
) {
84 DHerr(DH_F_DH_PUB_DECODE
, DH_R_BN_DECODE_ERROR
);
88 ASN1_INTEGER_free(public_key
);
89 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
93 ASN1_INTEGER_free(public_key
);
99 static int dh_pub_encode(X509_PUBKEY
*pk
, const EVP_PKEY
*pkey
)
103 unsigned char *penc
= NULL
;
106 ASN1_INTEGER
*pub_key
= NULL
;
110 str
= ASN1_STRING_new();
112 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
115 str
->length
= i2d_dhp(pkey
, dh
, &str
->data
);
116 if (str
->length
<= 0) {
117 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
120 ptype
= V_ASN1_SEQUENCE
;
122 pub_key
= BN_to_ASN1_INTEGER(dh
->pub_key
, NULL
);
126 penclen
= i2d_ASN1_INTEGER(pub_key
, &penc
);
128 ASN1_INTEGER_free(pub_key
);
131 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
135 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(pkey
->ameth
->pkey_id
),
136 ptype
, str
, penc
, penclen
))
141 ASN1_STRING_free(str
);
147 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
148 * the AlgorithmIdentifier contains the parameters, the private key is
149 * explicitly included and the pubkey must be recalculated.
152 static int dh_priv_decode(EVP_PKEY
*pkey
, const PKCS8_PRIV_KEY_INFO
*p8
)
154 const unsigned char *p
, *pm
;
158 const ASN1_STRING
*pstr
;
159 const X509_ALGOR
*palg
;
160 ASN1_INTEGER
*privkey
= NULL
;
164 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
167 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
169 if (ptype
!= V_ASN1_SEQUENCE
)
171 if ((privkey
= d2i_ASN1_INTEGER(NULL
, &p
, pklen
)) == NULL
)
176 pmlen
= pstr
->length
;
177 if ((dh
= d2i_dhp(pkey
, &pm
, pmlen
)) == NULL
)
180 /* We have parameters now set private key */
181 if ((dh
->priv_key
= BN_secure_new()) == NULL
182 || !ASN1_INTEGER_to_BN(privkey
, dh
->priv_key
)) {
183 DHerr(DH_F_DH_PRIV_DECODE
, DH_R_BN_ERROR
);
186 /* Calculate public key, increments dirty_cnt */
187 if (!DH_generate_key(dh
))
190 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
192 ASN1_STRING_clear_free(privkey
);
197 DHerr(DH_F_DH_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
200 ASN1_STRING_clear_free(privkey
);
204 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, const EVP_PKEY
*pkey
)
206 ASN1_STRING
*params
= NULL
;
207 ASN1_INTEGER
*prkey
= NULL
;
208 unsigned char *dp
= NULL
;
211 params
= ASN1_STRING_new();
213 if (params
== NULL
) {
214 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
218 params
->length
= i2d_dhp(pkey
, pkey
->pkey
.dh
, ¶ms
->data
);
219 if (params
->length
<= 0) {
220 DHerr(DH_F_DH_PRIV_ENCODE
, ERR_R_MALLOC_FAILURE
);
223 params
->type
= V_ASN1_SEQUENCE
;
225 /* Get private key into integer */
226 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->priv_key
, NULL
);
229 DHerr(DH_F_DH_PRIV_ENCODE
, DH_R_BN_ERROR
);
233 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
235 ASN1_STRING_clear_free(prkey
);
238 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(pkey
->ameth
->pkey_id
), 0,
239 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
246 ASN1_STRING_free(params
);
247 ASN1_STRING_clear_free(prkey
);
251 static int dh_param_decode(EVP_PKEY
*pkey
,
252 const unsigned char **pder
, int derlen
)
256 if ((dh
= d2i_dhp(pkey
, pder
, derlen
)) == NULL
) {
257 DHerr(DH_F_DH_PARAM_DECODE
, ERR_R_DH_LIB
);
261 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
265 static int dh_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
267 return i2d_dhp(pkey
, pkey
->pkey
.dh
, pder
);
270 static int do_dh_print(BIO
*bp
, const DH
*x
, int indent
, int ptype
)
272 int reason
= ERR_R_BUF_LIB
;
273 const char *ktype
= NULL
;
274 BIGNUM
*priv_key
, *pub_key
;
277 priv_key
= x
->priv_key
;
282 pub_key
= x
->pub_key
;
286 if (x
->p
== NULL
|| (ptype
== 2 && priv_key
== NULL
)
287 || (ptype
> 0 && pub_key
== NULL
)) {
288 reason
= ERR_R_PASSED_NULL_PARAMETER
;
293 ktype
= "DH Private-Key";
295 ktype
= "DH Public-Key";
297 ktype
= "DH Parameters";
299 BIO_indent(bp
, indent
, 128);
300 if (BIO_printf(bp
, "%s: (%d bit)\n", ktype
, BN_num_bits(x
->p
)) <= 0)
304 if (!ASN1_bn_print(bp
, "private-key:", priv_key
, NULL
, indent
))
306 if (!ASN1_bn_print(bp
, "public-key:", pub_key
, NULL
, indent
))
309 if (!ASN1_bn_print(bp
, "prime:", x
->p
, NULL
, indent
))
311 if (!ASN1_bn_print(bp
, "generator:", x
->g
, NULL
, indent
))
313 if (x
->q
&& !ASN1_bn_print(bp
, "subgroup order:", x
->q
, NULL
, indent
))
315 if (x
->j
&& !ASN1_bn_print(bp
, "subgroup factor:", x
->j
, NULL
, indent
))
319 BIO_indent(bp
, indent
, 128);
320 BIO_puts(bp
, "seed:");
321 for (i
= 0; i
< x
->seedlen
; i
++) {
323 if (BIO_puts(bp
, "\n") <= 0
324 || !BIO_indent(bp
, indent
+ 4, 128))
327 if (BIO_printf(bp
, "%02x%s", x
->seed
[i
],
328 ((i
+ 1) == x
->seedlen
) ? "" : ":") <= 0)
331 if (BIO_write(bp
, "\n", 1) <= 0)
334 if (x
->counter
&& !ASN1_bn_print(bp
, "counter:", x
->counter
, NULL
, indent
))
336 if (x
->length
!= 0) {
337 BIO_indent(bp
, indent
, 128);
338 if (BIO_printf(bp
, "recommended-private-length: %d bits\n",
339 (int)x
->length
) <= 0)
346 DHerr(DH_F_DO_DH_PRINT
, reason
);
350 static int int_dh_size(const EVP_PKEY
*pkey
)
352 return DH_size(pkey
->pkey
.dh
);
355 static int dh_bits(const EVP_PKEY
*pkey
)
357 return BN_num_bits(pkey
->pkey
.dh
->p
);
360 static int dh_security_bits(const EVP_PKEY
*pkey
)
362 return DH_security_bits(pkey
->pkey
.dh
);
365 static int dh_cmp_parameters(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
367 if (BN_cmp(a
->pkey
.dh
->p
, b
->pkey
.dh
->p
) ||
368 BN_cmp(a
->pkey
.dh
->g
, b
->pkey
.dh
->g
))
370 else if (a
->ameth
== &dhx_asn1_meth
) {
371 if (BN_cmp(a
->pkey
.dh
->q
, b
->pkey
.dh
->q
))
377 static int int_dh_bn_cpy(BIGNUM
**dst
, const BIGNUM
*src
)
382 * If source is read only just copy the pointer, so
383 * we don't have to reallocate it.
387 else if (BN_get_flags(src
, BN_FLG_STATIC_DATA
)
388 && !BN_get_flags(src
, BN_FLG_MALLOCED
))
390 else if ((a
= BN_dup(src
)) == NULL
)
397 static int int_dh_param_copy(DH
*to
, const DH
*from
, int is_x942
)
400 is_x942
= ! !from
->q
;
401 if (!int_dh_bn_cpy(&to
->p
, from
->p
))
403 if (!int_dh_bn_cpy(&to
->g
, from
->g
))
406 if (!int_dh_bn_cpy(&to
->q
, from
->q
))
408 if (!int_dh_bn_cpy(&to
->j
, from
->j
))
410 OPENSSL_free(to
->seed
);
414 to
->seed
= OPENSSL_memdup(from
->seed
, from
->seedlen
);
417 to
->seedlen
= from
->seedlen
;
420 to
->length
= from
->length
;
425 DH
*DHparams_dup(const DH
*dh
)
431 if (!int_dh_param_copy(ret
, dh
, -1)) {
438 static int dh_copy_parameters(EVP_PKEY
*to
, const EVP_PKEY
*from
)
440 if (to
->pkey
.dh
== NULL
) {
441 to
->pkey
.dh
= DH_new();
442 if (to
->pkey
.dh
== NULL
)
445 return int_dh_param_copy(to
->pkey
.dh
, from
->pkey
.dh
,
446 from
->ameth
== &dhx_asn1_meth
);
449 static int dh_missing_parameters(const EVP_PKEY
*a
)
451 if (a
->pkey
.dh
== NULL
|| a
->pkey
.dh
->p
== NULL
|| a
->pkey
.dh
->g
== NULL
)
456 static int dh_pub_cmp(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
458 if (dh_cmp_parameters(a
, b
) == 0)
460 if (BN_cmp(b
->pkey
.dh
->pub_key
, a
->pkey
.dh
->pub_key
) != 0)
466 static int dh_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
469 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, 0);
472 static int dh_public_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
475 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, 1);
478 static int dh_private_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
481 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, 2);
484 int DHparams_print(BIO
*bp
, const DH
*x
)
486 return do_dh_print(bp
, x
, 4, 0);
489 #ifndef OPENSSL_NO_CMS
490 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
);
491 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
);
494 static int dh_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
497 case ASN1_PKEY_CTRL_SET1_TLS_ENCPT
:
498 return dh_buf2key(EVP_PKEY_get0_DH(pkey
), arg2
, arg1
);
499 case ASN1_PKEY_CTRL_GET1_TLS_ENCPT
:
500 return dh_key2buf(EVP_PKEY_get0_DH(pkey
), arg2
);
506 static int dhx_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
509 #ifndef OPENSSL_NO_CMS
511 case ASN1_PKEY_CTRL_CMS_ENVELOPE
:
513 return dh_cms_decrypt(arg2
);
515 return dh_cms_encrypt(arg2
);
518 case ASN1_PKEY_CTRL_CMS_RI_TYPE
:
519 *(int *)arg2
= CMS_RECIPINFO_AGREE
;
528 static int dh_pkey_public_check(const EVP_PKEY
*pkey
)
530 DH
*dh
= pkey
->pkey
.dh
;
532 if (dh
->pub_key
== NULL
) {
533 DHerr(DH_F_DH_PKEY_PUBLIC_CHECK
, DH_R_MISSING_PUBKEY
);
537 return DH_check_pub_key_ex(dh
, dh
->pub_key
);
540 static int dh_pkey_param_check(const EVP_PKEY
*pkey
)
542 DH
*dh
= pkey
->pkey
.dh
;
544 return DH_check_ex(dh
);
547 static size_t dh_pkey_dirty_cnt(const EVP_PKEY
*pkey
)
549 return pkey
->pkey
.dh
->dirty_cnt
;
552 static void *dh_pkey_export_to(const EVP_PKEY
*pk
, EVP_KEYMGMT
*keymgmt
)
554 DH
*dh
= pk
->pkey
.dh
;
556 const BIGNUM
*p
= DH_get0_p(dh
), *g
= DH_get0_g(dh
), *q
= DH_get0_q(dh
);
557 const BIGNUM
*pub_key
= DH_get0_pub_key(dh
);
558 const BIGNUM
*priv_key
= DH_get0_priv_key(dh
);
560 void *provkey
= NULL
;
562 if (p
== NULL
|| g
== NULL
)
565 ossl_param_bld_init(&tmpl
);
566 if (!ossl_param_bld_push_BN(&tmpl
, OSSL_PKEY_PARAM_FFC_P
, p
)
567 || !ossl_param_bld_push_BN(&tmpl
, OSSL_PKEY_PARAM_FFC_G
, g
))
571 if (!ossl_param_bld_push_BN(&tmpl
, OSSL_PKEY_PARAM_FFC_Q
, q
))
576 * This may be used to pass domain parameters only without any key data -
577 * so "pub_key" is optional. We can never have a "priv_key" without a
578 * corresponding "pub_key" though.
580 if (pub_key
!= NULL
) {
581 if (!ossl_param_bld_push_BN(&tmpl
, OSSL_PKEY_PARAM_DH_PUB_KEY
, pub_key
))
584 if (priv_key
!= NULL
) {
585 if (!ossl_param_bld_push_BN(&tmpl
, OSSL_PKEY_PARAM_DH_PRIV_KEY
,
591 params
= ossl_param_bld_to_param(&tmpl
);
593 /* We export, the provider imports */
594 provkey
= evp_keymgmt_importkey(keymgmt
, params
);
596 ossl_param_bld_free(params
);
600 const EVP_PKEY_ASN1_METHOD dh_asn1_meth
= {
606 "OpenSSL PKCS#3 DH method",
623 dh_missing_parameters
,
635 dh_pkey_public_check
,
644 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
= {
650 "OpenSSL X9.42 DH method",
667 dh_missing_parameters
,
679 dh_pkey_public_check
,
683 #ifndef OPENSSL_NO_CMS
685 static int dh_cms_set_peerkey(EVP_PKEY_CTX
*pctx
,
686 X509_ALGOR
*alg
, ASN1_BIT_STRING
*pubkey
)
688 const ASN1_OBJECT
*aoid
;
691 ASN1_INTEGER
*public_key
= NULL
;
693 EVP_PKEY
*pkpeer
= NULL
, *pk
= NULL
;
695 const unsigned char *p
;
698 X509_ALGOR_get0(&aoid
, &atype
, &aval
, alg
);
699 if (OBJ_obj2nid(aoid
) != NID_dhpublicnumber
)
701 /* Only absent parameters allowed in RFC XXXX */
702 if (atype
!= V_ASN1_UNDEF
&& atype
== V_ASN1_NULL
)
705 pk
= EVP_PKEY_CTX_get0_pkey(pctx
);
708 if (pk
->type
!= EVP_PKEY_DHX
)
710 /* Get parameters from parent key */
711 dhpeer
= DHparams_dup(pk
->pkey
.dh
);
712 /* We have parameters now set public key */
713 plen
= ASN1_STRING_length(pubkey
);
714 p
= ASN1_STRING_get0_data(pubkey
);
718 if ((public_key
= d2i_ASN1_INTEGER(NULL
, &p
, plen
)) == NULL
) {
719 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_DECODE_ERROR
);
723 /* We have parameters now set public key */
724 if ((dhpeer
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
)) == NULL
) {
725 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_BN_DECODE_ERROR
);
729 pkpeer
= EVP_PKEY_new();
732 EVP_PKEY_assign(pkpeer
, pk
->ameth
->pkey_id
, dhpeer
);
734 if (EVP_PKEY_derive_set_peer(pctx
, pkpeer
) > 0)
737 ASN1_INTEGER_free(public_key
);
738 EVP_PKEY_free(pkpeer
);
743 static int dh_cms_set_shared_info(EVP_PKEY_CTX
*pctx
, CMS_RecipientInfo
*ri
)
747 X509_ALGOR
*alg
, *kekalg
= NULL
;
748 ASN1_OCTET_STRING
*ukm
;
749 const unsigned char *p
;
750 unsigned char *dukm
= NULL
;
753 const EVP_CIPHER
*kekcipher
;
754 EVP_CIPHER_CTX
*kekctx
;
756 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &alg
, &ukm
))
760 * For DH we only have one OID permissible. If ever any more get defined
761 * we will need something cleverer.
763 if (OBJ_obj2nid(alg
->algorithm
) != NID_id_smime_alg_ESDH
) {
764 DHerr(DH_F_DH_CMS_SET_SHARED_INFO
, DH_R_KDF_PARAMETER_ERROR
);
768 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, EVP_PKEY_DH_KDF_X9_42
) <= 0)
771 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, EVP_sha1()) <= 0)
774 if (alg
->parameter
->type
!= V_ASN1_SEQUENCE
)
777 p
= alg
->parameter
->value
.sequence
->data
;
778 plen
= alg
->parameter
->value
.sequence
->length
;
779 kekalg
= d2i_X509_ALGOR(NULL
, &p
, plen
);
782 kekctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
785 kekcipher
= EVP_get_cipherbyobj(kekalg
->algorithm
);
786 if (!kekcipher
|| EVP_CIPHER_mode(kekcipher
) != EVP_CIPH_WRAP_MODE
)
788 if (!EVP_EncryptInit_ex(kekctx
, kekcipher
, NULL
, NULL
, NULL
))
790 if (EVP_CIPHER_asn1_to_param(kekctx
, kekalg
->parameter
) <= 0)
793 keylen
= EVP_CIPHER_CTX_key_length(kekctx
);
794 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
796 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
797 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
,
798 OBJ_nid2obj(EVP_CIPHER_type(kekcipher
)))
803 dukmlen
= ASN1_STRING_length(ukm
);
804 dukm
= OPENSSL_memdup(ASN1_STRING_get0_data(ukm
), dukmlen
);
809 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
815 X509_ALGOR_free(kekalg
);
820 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
)
823 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
826 /* See if we need to set peer key */
827 if (!EVP_PKEY_CTX_get0_peerkey(pctx
)) {
829 ASN1_BIT_STRING
*pubkey
;
830 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &alg
, &pubkey
,
835 if (!dh_cms_set_peerkey(pctx
, alg
, pubkey
)) {
836 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_PEER_KEY_ERROR
);
840 /* Set DH derivation parameters and initialise unwrap context */
841 if (!dh_cms_set_shared_info(pctx
, ri
)) {
842 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_SHARED_INFO_ERROR
);
848 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
)
854 X509_ALGOR
*talg
, *wrap_alg
= NULL
;
855 const ASN1_OBJECT
*aoid
;
856 ASN1_BIT_STRING
*pubkey
;
857 ASN1_STRING
*wrap_str
;
858 ASN1_OCTET_STRING
*ukm
;
859 unsigned char *penc
= NULL
, *dukm
= NULL
;
863 int kdf_type
, wrap_nid
;
864 const EVP_MD
*kdf_md
;
865 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
868 /* Get ephemeral key */
869 pkey
= EVP_PKEY_CTX_get0_pkey(pctx
);
870 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &talg
, &pubkey
,
873 X509_ALGOR_get0(&aoid
, NULL
, NULL
, talg
);
874 /* Is everything uninitialised? */
875 if (aoid
== OBJ_nid2obj(NID_undef
)) {
876 ASN1_INTEGER
*pubk
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->pub_key
, NULL
);
881 penclen
= i2d_ASN1_INTEGER(pubk
, &penc
);
882 ASN1_INTEGER_free(pubk
);
885 ASN1_STRING_set0(pubkey
, penc
, penclen
);
886 pubkey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
887 pubkey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
890 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_dhpublicnumber
),
894 /* See if custom parameters set */
895 kdf_type
= EVP_PKEY_CTX_get_dh_kdf_type(pctx
);
898 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx
, &kdf_md
))
901 if (kdf_type
== EVP_PKEY_DH_KDF_NONE
) {
902 kdf_type
= EVP_PKEY_DH_KDF_X9_42
;
903 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, kdf_type
) <= 0)
905 } else if (kdf_type
!= EVP_PKEY_DH_KDF_X9_42
)
908 if (kdf_md
== NULL
) {
909 /* Only SHA1 supported */
911 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, kdf_md
) <= 0)
913 } else if (EVP_MD_type(kdf_md
) != NID_sha1
)
914 /* Unsupported digest */
917 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &talg
, &ukm
))
921 ctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
922 wrap_nid
= EVP_CIPHER_CTX_type(ctx
);
923 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
, OBJ_nid2obj(wrap_nid
)) <= 0)
925 keylen
= EVP_CIPHER_CTX_key_length(ctx
);
927 /* Package wrap algorithm in an AlgorithmIdentifier */
929 wrap_alg
= X509_ALGOR_new();
930 if (wrap_alg
== NULL
)
932 wrap_alg
->algorithm
= OBJ_nid2obj(wrap_nid
);
933 wrap_alg
->parameter
= ASN1_TYPE_new();
934 if (wrap_alg
->parameter
== NULL
)
936 if (EVP_CIPHER_param_to_asn1(ctx
, wrap_alg
->parameter
) <= 0)
938 if (ASN1_TYPE_get(wrap_alg
->parameter
) == NID_undef
) {
939 ASN1_TYPE_free(wrap_alg
->parameter
);
940 wrap_alg
->parameter
= NULL
;
943 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
947 dukmlen
= ASN1_STRING_length(ukm
);
948 dukm
= OPENSSL_memdup(ASN1_STRING_get0_data(ukm
), dukmlen
);
953 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
958 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
959 * of another AlgorithmIdentifier.
962 penclen
= i2d_X509_ALGOR(wrap_alg
, &penc
);
963 if (!penc
|| !penclen
)
965 wrap_str
= ASN1_STRING_new();
966 if (wrap_str
== NULL
)
968 ASN1_STRING_set0(wrap_str
, penc
, penclen
);
970 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_id_smime_alg_ESDH
),
971 V_ASN1_SEQUENCE
, wrap_str
);
977 X509_ALGOR_free(wrap_alg
);