1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
60 #include <openssl/x509.h>
61 #include <openssl/asn1.h>
62 #include <openssl/dh.h>
63 #include <openssl/bn.h>
64 #include "asn1_locl.h"
65 #ifndef OPENSSL_NO_CMS
66 #include <openssl/cms.h>
69 extern const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
;
71 /* i2d/d2i like DH parameter functions which use the appropriate routine
72 * for PKCS#3 DH or X9.42 DH.
75 static DH
* d2i_dhp(const EVP_PKEY
*pkey
, const unsigned char **pp
, long length
)
77 if (pkey
->ameth
== &dhx_asn1_meth
)
78 return d2i_DHxparams(NULL
, pp
, length
);
79 return d2i_DHparams(NULL
, pp
, length
);
82 static int i2d_dhp(const EVP_PKEY
*pkey
, const DH
*a
, unsigned char **pp
)
84 if (pkey
->ameth
== &dhx_asn1_meth
)
85 return i2d_DHxparams(a
, pp
);
86 return i2d_DHparams(a
, pp
);
89 static void int_dh_free(EVP_PKEY
*pkey
)
91 DH_free(pkey
->pkey
.dh
);
94 static int dh_pub_decode(EVP_PKEY
*pkey
, X509_PUBKEY
*pubkey
)
96 const unsigned char *p
, *pm
;
102 ASN1_INTEGER
*public_key
= NULL
;
106 if (!X509_PUBKEY_get0_param(NULL
, &p
, &pklen
, &palg
, pubkey
))
108 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
110 if (ptype
!= V_ASN1_SEQUENCE
)
112 DHerr(DH_F_DH_PUB_DECODE
, DH_R_PARAMETER_ENCODING_ERROR
);
118 pmlen
= pstr
->length
;
120 if (!(dh
= d2i_dhp(pkey
, &pm
, pmlen
)))
122 DHerr(DH_F_DH_PUB_DECODE
, DH_R_DECODE_ERROR
);
126 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
)))
135 DHerr(DH_F_DH_PUB_DECODE
, DH_R_BN_DECODE_ERROR
);
139 ASN1_INTEGER_free(public_key
);
140 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
145 ASN1_INTEGER_free(public_key
);
152 static int dh_pub_encode(X509_PUBKEY
*pk
, const EVP_PKEY
*pkey
)
157 unsigned char *penc
= NULL
;
160 ASN1_INTEGER
*pub_key
= NULL
;
164 str
= ASN1_STRING_new();
165 str
->length
= i2d_dhp(pkey
, dh
, &str
->data
);
166 if (str
->length
<= 0)
168 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
);
184 DHerr(DH_F_DH_PUB_ENCODE
, ERR_R_MALLOC_FAILURE
);
188 if (X509_PUBKEY_set0_param(pk
, OBJ_nid2obj(pkey
->ameth
->pkey_id
),
189 ptype
, pval
, penc
, penclen
))
196 ASN1_STRING_free(pval
);
202 /* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
203 * that the AlgorithmIdentifier contains the parameters, the private key
204 * is explcitly included and the pubkey must be recalculated.
207 static int dh_priv_decode(EVP_PKEY
*pkey
, PKCS8_PRIV_KEY_INFO
*p8
)
209 const unsigned char *p
, *pm
;
215 ASN1_INTEGER
*privkey
= NULL
;
219 if (!PKCS8_pkey_get0(NULL
, &p
, &pklen
, &palg
, p8
))
222 X509_ALGOR_get0(NULL
, &ptype
, &pval
, palg
);
224 if (ptype
!= V_ASN1_SEQUENCE
)
227 if (!(privkey
=d2i_ASN1_INTEGER(NULL
, &p
, pklen
)))
233 pmlen
= pstr
->length
;
234 if (!(dh
= d2i_dhp(pkey
, &pm
, pmlen
)))
236 /* We have parameters now set private key */
237 if (!(dh
->priv_key
= ASN1_INTEGER_to_BN(privkey
, NULL
)))
239 DHerr(DH_F_DH_PRIV_DECODE
,DH_R_BN_ERROR
);
242 /* Calculate public key */
243 if (!DH_generate_key(dh
))
246 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
248 ASN1_INTEGER_free(privkey
);
253 DHerr(DH_F_DH_PRIV_DECODE
, EVP_R_DECODE_ERROR
);
259 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO
*p8
, const EVP_PKEY
*pkey
)
261 ASN1_STRING
*params
= NULL
;
262 ASN1_INTEGER
*prkey
= NULL
;
263 unsigned char *dp
= NULL
;
266 params
= ASN1_STRING_new();
270 DHerr(DH_F_DH_PRIV_ENCODE
,ERR_R_MALLOC_FAILURE
);
274 params
->length
= i2d_dhp(pkey
, pkey
->pkey
.dh
, ¶ms
->data
);
275 if (params
->length
<= 0)
277 DHerr(DH_F_DH_PRIV_ENCODE
,ERR_R_MALLOC_FAILURE
);
280 params
->type
= V_ASN1_SEQUENCE
;
282 /* Get private key into integer */
283 prkey
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->priv_key
, NULL
);
287 DHerr(DH_F_DH_PRIV_ENCODE
,DH_R_BN_ERROR
);
291 dplen
= i2d_ASN1_INTEGER(prkey
, &dp
);
293 ASN1_INTEGER_free(prkey
);
295 if (!PKCS8_pkey_set0(p8
, OBJ_nid2obj(pkey
->ameth
->pkey_id
), 0,
296 V_ASN1_SEQUENCE
, params
, dp
, dplen
))
305 ASN1_STRING_free(params
);
307 ASN1_INTEGER_free(prkey
);
312 static void update_buflen(const BIGNUM
*b
, size_t *pbuflen
)
317 if (*pbuflen
< (i
= (size_t)BN_num_bytes(b
)))
321 static int dh_param_decode(EVP_PKEY
*pkey
,
322 const unsigned char **pder
, int derlen
)
325 if (!(dh
= d2i_dhp(pkey
, pder
, derlen
)))
327 DHerr(DH_F_DH_PARAM_DECODE
, ERR_R_DH_LIB
);
330 EVP_PKEY_assign(pkey
, pkey
->ameth
->pkey_id
, dh
);
334 static int dh_param_encode(const EVP_PKEY
*pkey
, unsigned char **pder
)
336 return i2d_dhp(pkey
, pkey
->pkey
.dh
, pder
);
339 static int do_dh_print(BIO
*bp
, const DH
*x
, int indent
,
340 ASN1_PCTX
*ctx
, int ptype
)
342 unsigned char *m
=NULL
;
343 int reason
=ERR_R_BUF_LIB
,ret
=0;
346 const char *ktype
= NULL
;
348 BIGNUM
*priv_key
, *pub_key
;
351 priv_key
= x
->priv_key
;
356 pub_key
= x
->pub_key
;
360 update_buflen(x
->p
, &buf_len
);
364 reason
= ERR_R_PASSED_NULL_PARAMETER
;
368 update_buflen(x
->g
, &buf_len
);
369 update_buflen(x
->q
, &buf_len
);
370 update_buflen(x
->j
, &buf_len
);
371 update_buflen(x
->counter
, &buf_len
);
372 update_buflen(pub_key
, &buf_len
);
373 update_buflen(priv_key
, &buf_len
);
376 ktype
= "DH Private-Key";
378 ktype
= "DH Public-Key";
380 ktype
= "DH Parameters";
382 m
= OPENSSL_malloc(buf_len
+10);
385 reason
=ERR_R_MALLOC_FAILURE
;
389 BIO_indent(bp
, indent
, 128);
390 if (BIO_printf(bp
,"%s: (%d bit)\n", ktype
, BN_num_bits(x
->p
)) <= 0)
394 if (!ASN1_bn_print(bp
,"private-key:",priv_key
,m
,indent
)) goto err
;
395 if (!ASN1_bn_print(bp
,"public-key:",pub_key
,m
,indent
)) goto err
;
397 if (!ASN1_bn_print(bp
,"prime:",x
->p
,m
,indent
)) goto err
;
398 if (!ASN1_bn_print(bp
,"generator:",x
->g
,m
,indent
)) goto err
;
399 if (x
->q
&& !ASN1_bn_print(bp
,"subgroup order:",x
->q
,m
,indent
)) goto err
;
400 if (x
->j
&& !ASN1_bn_print(bp
,"subgroup factor:",x
->j
,m
,indent
))
405 BIO_indent(bp
, indent
, 128);
406 BIO_puts(bp
, "seed:");
407 for (i
=0; i
< x
->seedlen
; i
++)
411 if(BIO_puts(bp
,"\n") <= 0
412 || !BIO_indent(bp
,indent
+4,128))
415 if (BIO_printf(bp
,"%02x%s", x
->seed
[i
],
416 ((i
+1) == x
->seedlen
)?"":":") <= 0)
419 if (BIO_write(bp
,"\n",1) <= 0) return(0);
421 if (x
->counter
&& !ASN1_bn_print(bp
,"counter:",x
->counter
,m
,indent
))
425 BIO_indent(bp
, indent
, 128);
426 if (BIO_printf(bp
,"recommended-private-length: %d bits\n",
427 (int)x
->length
) <= 0) goto err
;
435 DHerr(DH_F_DO_DH_PRINT
,reason
);
437 if (m
!= NULL
) OPENSSL_free(m
);
441 static int int_dh_size(const EVP_PKEY
*pkey
)
443 return(DH_size(pkey
->pkey
.dh
));
446 static int dh_bits(const EVP_PKEY
*pkey
)
448 return BN_num_bits(pkey
->pkey
.dh
->p
);
451 static int dh_security_bits(const EVP_PKEY
*pkey
)
453 return DH_security_bits(pkey
->pkey
.dh
);
456 static int dh_cmp_parameters(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
458 if ( BN_cmp(a
->pkey
.dh
->p
,b
->pkey
.dh
->p
) ||
459 BN_cmp(a
->pkey
.dh
->g
,b
->pkey
.dh
->g
))
461 else if (a
->ameth
== &dhx_asn1_meth
)
463 if (BN_cmp(a
->pkey
.dh
->q
,b
->pkey
.dh
->q
))
469 static int int_dh_bn_cpy(BIGNUM
**dst
, const BIGNUM
*src
)
486 static int int_dh_param_copy(DH
*to
, const DH
*from
, int is_x942
)
490 if (!int_dh_bn_cpy(&to
->p
, from
->p
))
492 if (!int_dh_bn_cpy(&to
->g
, from
->g
))
496 if (!int_dh_bn_cpy(&to
->q
, from
->q
))
498 if (!int_dh_bn_cpy(&to
->j
, from
->j
))
502 OPENSSL_free(to
->seed
);
508 to
->seed
= BUF_memdup(from
->seed
, from
->seedlen
);
511 to
->seedlen
= from
->seedlen
;
515 to
->length
= from
->length
;
520 DH
*DHparams_dup(DH
*dh
)
526 if (!int_dh_param_copy(ret
, dh
, -1))
534 static int dh_copy_parameters(EVP_PKEY
*to
, const EVP_PKEY
*from
)
536 return int_dh_param_copy(to
->pkey
.dh
, from
->pkey
.dh
,
537 from
->ameth
== &dhx_asn1_meth
);
540 static int dh_missing_parameters(const EVP_PKEY
*a
)
542 if (!a
->pkey
.dh
->p
|| !a
->pkey
.dh
->g
)
547 static int dh_pub_cmp(const EVP_PKEY
*a
, const EVP_PKEY
*b
)
549 if (dh_cmp_parameters(a
, b
) == 0)
551 if (BN_cmp(b
->pkey
.dh
->pub_key
,a
->pkey
.dh
->pub_key
) != 0)
557 static int dh_param_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
560 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 0);
563 static int dh_public_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
566 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 1);
569 static int dh_private_print(BIO
*bp
, const EVP_PKEY
*pkey
, int indent
,
572 return do_dh_print(bp
, pkey
->pkey
.dh
, indent
, ctx
, 2);
575 int DHparams_print(BIO
*bp
, const DH
*x
)
577 return do_dh_print(bp
, x
, 4, NULL
, 0);
580 #ifndef OPENSSL_NO_CMS
581 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
);
582 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
);
585 static int dh_pkey_ctrl(EVP_PKEY
*pkey
, int op
, long arg1
, void *arg2
)
589 #ifndef OPENSSL_NO_CMS
591 case ASN1_PKEY_CTRL_CMS_ENVELOPE
:
593 return dh_cms_decrypt(arg2
);
595 return dh_cms_encrypt(arg2
);
598 case ASN1_PKEY_CTRL_CMS_RI_TYPE
:
599 *(int *)arg2
= CMS_RECIPINFO_AGREE
;
608 const EVP_PKEY_ASN1_METHOD dh_asn1_meth
=
615 "OpenSSL PKCS#3 DH method",
632 dh_missing_parameters
,
642 const EVP_PKEY_ASN1_METHOD dhx_asn1_meth
=
649 "OpenSSL X9.42 DH method",
666 dh_missing_parameters
,
675 #ifndef OPENSSL_NO_CMS
677 static int dh_cms_set_peerkey(EVP_PKEY_CTX
*pctx
,
678 X509_ALGOR
*alg
, ASN1_BIT_STRING
*pubkey
)
683 ASN1_INTEGER
*public_key
= NULL
;
685 EVP_PKEY
*pkpeer
= NULL
, *pk
= NULL
;
687 const unsigned char *p
;
690 X509_ALGOR_get0(&aoid
, &atype
, &aval
, alg
);
691 if (OBJ_obj2nid(aoid
) != NID_dhpublicnumber
)
693 /* Only absent parameters allowed in RFC XXXX */
694 if (atype
!= V_ASN1_UNDEF
&& atype
== V_ASN1_NULL
)
697 pk
= EVP_PKEY_CTX_get0_pkey(pctx
);
700 if (pk
->type
!= EVP_PKEY_DHX
)
702 /* Get parameters from parent key */
703 dhpeer
= DHparams_dup(pk
->pkey
.dh
);
704 /* We have parameters now set public key */
705 plen
= ASN1_STRING_length(pubkey
);
706 p
= ASN1_STRING_data(pubkey
);
710 if (!(public_key
=d2i_ASN1_INTEGER(NULL
, &p
, plen
)))
712 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_DECODE_ERROR
);
716 /* We have parameters now set public key */
717 if (!(dhpeer
->pub_key
= ASN1_INTEGER_to_BN(public_key
, NULL
)))
719 DHerr(DH_F_DH_CMS_SET_PEERKEY
, DH_R_BN_DECODE_ERROR
);
723 pkpeer
= EVP_PKEY_new();
726 EVP_PKEY_assign(pkpeer
, pk
->ameth
->pkey_id
, dhpeer
);
728 if (EVP_PKEY_derive_set_peer(pctx
, pkpeer
) > 0)
732 ASN1_INTEGER_free(public_key
);
734 EVP_PKEY_free(pkpeer
);
740 static int dh_cms_set_shared_info(EVP_PKEY_CTX
*pctx
, CMS_RecipientInfo
*ri
)
744 X509_ALGOR
*alg
, *kekalg
= NULL
;
745 ASN1_OCTET_STRING
*ukm
;
746 const unsigned char *p
;
747 unsigned char *dukm
= NULL
;
750 const EVP_CIPHER
*kekcipher
;
751 EVP_CIPHER_CTX
*kekctx
;
753 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &alg
, &ukm
))
756 /* For DH we only have one OID permissible. If ever any more get
757 * defined we will need something cleverer.
759 if (OBJ_obj2nid(alg
->algorithm
) != NID_id_smime_alg_ESDH
)
761 DHerr(DH_F_DH_CMS_SET_SHARED_INFO
, DH_R_KDF_PARAMETER_ERROR
);
765 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, EVP_PKEY_DH_KDF_X9_42
) <= 0)
768 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, EVP_sha1()) <= 0)
771 if (alg
->parameter
->type
!= V_ASN1_SEQUENCE
)
774 p
= alg
->parameter
->value
.sequence
->data
;
775 plen
= alg
->parameter
->value
.sequence
->length
;
776 kekalg
= d2i_X509_ALGOR(NULL
, &p
, plen
);
779 kekctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
782 kekcipher
= EVP_get_cipherbyobj(kekalg
->algorithm
);
783 if (!kekcipher
|| EVP_CIPHER_mode(kekcipher
) != EVP_CIPH_WRAP_MODE
)
785 if (!EVP_EncryptInit_ex(kekctx
, kekcipher
, NULL
, NULL
, NULL
))
787 if (EVP_CIPHER_asn1_to_param(kekctx
, kekalg
->parameter
) <= 0)
790 keylen
= EVP_CIPHER_CTX_key_length(kekctx
);
791 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
793 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
794 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
,
795 OBJ_nid2obj(EVP_CIPHER_type(kekcipher
))) <= 0)
800 dukmlen
= ASN1_STRING_length(ukm
);
801 dukm
= BUF_memdup(ASN1_STRING_data(ukm
), dukmlen
);
806 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
813 X509_ALGOR_free(kekalg
);
819 static int dh_cms_decrypt(CMS_RecipientInfo
*ri
)
822 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
825 /* See if we need to set peer key */
826 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
))
837 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_PEER_KEY_ERROR
);
841 /* Set DH derivation parameters and initialise unwrap context */
842 if (!dh_cms_set_shared_info(pctx
, ri
))
844 DHerr(DH_F_DH_CMS_DECRYPT
, DH_R_SHARED_INFO_ERROR
);
850 static int dh_cms_encrypt(CMS_RecipientInfo
*ri
)
856 X509_ALGOR
*talg
, *wrap_alg
= NULL
;
858 ASN1_BIT_STRING
*pubkey
;
859 ASN1_STRING
*wrap_str
;
860 ASN1_OCTET_STRING
*ukm
;
861 unsigned char *penc
= NULL
, *dukm
= NULL
;
865 int kdf_type
, wrap_nid
;
866 const EVP_MD
*kdf_md
;
867 pctx
= CMS_RecipientInfo_get0_pkey_ctx(ri
);
870 /* Get ephemeral key */
871 pkey
= EVP_PKEY_CTX_get0_pkey(pctx
);
872 if (!CMS_RecipientInfo_kari_get0_orig_id(ri
, &talg
, &pubkey
,
875 X509_ALGOR_get0(&aoid
, NULL
, NULL
, talg
);
876 /* Is everything uninitialised? */
877 if (aoid
== OBJ_nid2obj(NID_undef
))
880 pubk
= BN_to_ASN1_INTEGER(pkey
->pkey
.dh
->pub_key
, NULL
);
885 penclen
= i2d_ASN1_INTEGER(pubk
, &penc
);
886 ASN1_INTEGER_free(pubk
);
889 ASN1_STRING_set0(pubkey
, penc
, penclen
);
890 pubkey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
|0x07);
891 pubkey
->flags
|=ASN1_STRING_FLAG_BITS_LEFT
;
894 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_dhpublicnumber
),
898 /* See if custom paraneters set */
899 kdf_type
= EVP_PKEY_CTX_get_dh_kdf_type(pctx
);
902 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx
, &kdf_md
))
905 if (kdf_type
== EVP_PKEY_DH_KDF_NONE
)
907 kdf_type
= EVP_PKEY_DH_KDF_X9_42
;
908 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx
, kdf_type
) <= 0)
911 else if (kdf_type
!= EVP_PKEY_DH_KDF_X9_42
)
916 /* Only SHA1 supported */
918 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx
, kdf_md
) <= 0)
921 else if (EVP_MD_type(kdf_md
) != NID_sha1
)
922 /* Unsupported digest */
925 if (!CMS_RecipientInfo_kari_get0_alg(ri
, &talg
, &ukm
))
929 ctx
= CMS_RecipientInfo_kari_get0_ctx(ri
);
930 wrap_nid
= EVP_CIPHER_CTX_type(ctx
);
931 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx
, OBJ_nid2obj(wrap_nid
)) <= 0)
933 keylen
= EVP_CIPHER_CTX_key_length(ctx
);
935 /* Package wrap algorithm in an AlgorithmIdentifier */
937 wrap_alg
= X509_ALGOR_new();
940 wrap_alg
->algorithm
= OBJ_nid2obj(wrap_nid
);
941 wrap_alg
->parameter
= ASN1_TYPE_new();
942 if (!wrap_alg
->parameter
)
944 if (EVP_CIPHER_param_to_asn1(ctx
, wrap_alg
->parameter
) <= 0)
946 if (ASN1_TYPE_get(wrap_alg
->parameter
) == NID_undef
)
948 ASN1_TYPE_free(wrap_alg
->parameter
);
949 wrap_alg
->parameter
= NULL
;
952 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx
, keylen
) <= 0)
957 dukmlen
= ASN1_STRING_length(ukm
);
958 dukm
= BUF_memdup(ASN1_STRING_data(ukm
), dukmlen
);
963 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx
, dukm
, dukmlen
) <= 0)
967 /* Now need to wrap encoding of wrap AlgorithmIdentifier into
968 * parameter of another AlgorithmIdentifier.
971 penclen
= i2d_X509_ALGOR(wrap_alg
, &penc
);
972 if (!penc
|| !penclen
)
974 wrap_str
= ASN1_STRING_new();
977 ASN1_STRING_set0(wrap_str
, penc
, penclen
);
979 X509_ALGOR_set0(talg
, OBJ_nid2obj(NID_id_smime_alg_ESDH
),
980 V_ASN1_SEQUENCE
, wrap_str
);
988 X509_ALGOR_free(wrap_alg
);