source: EcnlProtoTool/trunk/openssl-1.1.0e/crypto/dh/dh_ameth.c@ 331

Last change on this file since 331 was 331, checked in by coas-nagasima, 6 years ago

prototoolに関連するプロジェクトをnewlibからmuslを使うよう変更・更新
ntshellをnewlibの下位の実装から、muslのsyscallの実装に変更・更新
以下のOSSをアップデート
・mruby-1.3.0
・musl-1.1.18
・onigmo-6.1.3
・tcc-0.9.27
以下のOSSを追加
・openssl-1.1.0e
・curl-7.57.0
・zlib-1.2.11
以下のmrbgemsを追加
・iij/mruby-digest
・iij/mruby-env
・iij/mruby-errno
・iij/mruby-iijson
・iij/mruby-ipaddr
・iij/mruby-mock
・iij/mruby-require
・iij/mruby-tls-openssl
  • Property svn:eol-style set to native
  • Property svn:mime-type set to text/x-csrc
File size: 21.6 KB
Line 
1/*
2 * Copyright 2006-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/x509.h>
13#include <openssl/asn1.h>
14#include "dh_locl.h"
15#include <openssl/bn.h>
16#include "internal/asn1_int.h"
17#include "internal/evp_int.h"
18#include <openssl/cms.h>
19
20/*
21 * i2d/d2i like DH parameter functions which use the appropriate routine for
22 * PKCS#3 DH or X9.42 DH.
23 */
24
25static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp,
26 long length)
27{
28 if (pkey->ameth == &dhx_asn1_meth)
29 return d2i_DHxparams(NULL, pp, length);
30 return d2i_DHparams(NULL, pp, length);
31}
32
33static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
34{
35 if (pkey->ameth == &dhx_asn1_meth)
36 return i2d_DHxparams(a, pp);
37 return i2d_DHparams(a, pp);
38}
39
40static void int_dh_free(EVP_PKEY *pkey)
41{
42 DH_free(pkey->pkey.dh);
43}
44
45static int dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
46{
47 const unsigned char *p, *pm;
48 int pklen, pmlen;
49 int ptype;
50 const void *pval;
51 const ASN1_STRING *pstr;
52 X509_ALGOR *palg;
53 ASN1_INTEGER *public_key = NULL;
54
55 DH *dh = NULL;
56
57 if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
58 return 0;
59 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
60
61 if (ptype != V_ASN1_SEQUENCE) {
62 DHerr(DH_F_DH_PUB_DECODE, DH_R_PARAMETER_ENCODING_ERROR);
63 goto err;
64 }
65
66 pstr = pval;
67 pm = pstr->data;
68 pmlen = pstr->length;
69
70 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
71 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
72 goto err;
73 }
74
75 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
76 DHerr(DH_F_DH_PUB_DECODE, DH_R_DECODE_ERROR);
77 goto err;
78 }
79
80 /* We have parameters now set public key */
81 if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
82 DHerr(DH_F_DH_PUB_DECODE, DH_R_BN_DECODE_ERROR);
83 goto err;
84 }
85
86 ASN1_INTEGER_free(public_key);
87 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
88 return 1;
89
90 err:
91 ASN1_INTEGER_free(public_key);
92 DH_free(dh);
93 return 0;
94
95}
96
97static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
98{
99 DH *dh;
100 int ptype;
101 unsigned char *penc = NULL;
102 int penclen;
103 ASN1_STRING *str;
104 ASN1_INTEGER *pub_key = NULL;
105
106 dh = pkey->pkey.dh;
107
108 str = ASN1_STRING_new();
109 if (str == NULL) {
110 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
111 goto err;
112 }
113 str->length = i2d_dhp(pkey, dh, &str->data);
114 if (str->length <= 0) {
115 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
116 goto err;
117 }
118 ptype = V_ASN1_SEQUENCE;
119
120 pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
121 if (!pub_key)
122 goto err;
123
124 penclen = i2d_ASN1_INTEGER(pub_key, &penc);
125
126 ASN1_INTEGER_free(pub_key);
127
128 if (penclen <= 0) {
129 DHerr(DH_F_DH_PUB_ENCODE, ERR_R_MALLOC_FAILURE);
130 goto err;
131 }
132
133 if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
134 ptype, str, penc, penclen))
135 return 1;
136
137 err:
138 OPENSSL_free(penc);
139 ASN1_STRING_free(str);
140
141 return 0;
142}
143
144/*
145 * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
146 * the AlgorithmIdentifier contains the parameters, the private key is
147 * explicitly included and the pubkey must be recalculated.
148 */
149
150static int dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
151{
152 const unsigned char *p, *pm;
153 int pklen, pmlen;
154 int ptype;
155 const void *pval;
156 const ASN1_STRING *pstr;
157 const X509_ALGOR *palg;
158 ASN1_INTEGER *privkey = NULL;
159
160 DH *dh = NULL;
161
162 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
163 return 0;
164
165 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
166
167 if (ptype != V_ASN1_SEQUENCE)
168 goto decerr;
169 if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
170 goto decerr;
171
172 pstr = pval;
173 pm = pstr->data;
174 pmlen = pstr->length;
175 if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL)
176 goto decerr;
177
178 /* We have parameters now set private key */
179 if ((dh->priv_key = BN_secure_new()) == NULL
180 || !ASN1_INTEGER_to_BN(privkey, dh->priv_key)) {
181 DHerr(DH_F_DH_PRIV_DECODE, DH_R_BN_ERROR);
182 goto dherr;
183 }
184 /* Calculate public key */
185 if (!DH_generate_key(dh))
186 goto dherr;
187
188 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
189
190 ASN1_STRING_clear_free(privkey);
191
192 return 1;
193
194 decerr:
195 DHerr(DH_F_DH_PRIV_DECODE, EVP_R_DECODE_ERROR);
196 dherr:
197 DH_free(dh);
198 ASN1_STRING_clear_free(privkey);
199 return 0;
200}
201
202static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
203{
204 ASN1_STRING *params = NULL;
205 ASN1_INTEGER *prkey = NULL;
206 unsigned char *dp = NULL;
207 int dplen;
208
209 params = ASN1_STRING_new();
210
211 if (params == NULL) {
212 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
213 goto err;
214 }
215
216 params->length = i2d_dhp(pkey, pkey->pkey.dh, &params->data);
217 if (params->length <= 0) {
218 DHerr(DH_F_DH_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
219 goto err;
220 }
221 params->type = V_ASN1_SEQUENCE;
222
223 /* Get private key into integer */
224 prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);
225
226 if (!prkey) {
227 DHerr(DH_F_DH_PRIV_ENCODE, DH_R_BN_ERROR);
228 goto err;
229 }
230
231 dplen = i2d_ASN1_INTEGER(prkey, &dp);
232
233 ASN1_STRING_clear_free(prkey);
234 prkey = NULL;
235
236 if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
237 V_ASN1_SEQUENCE, params, dp, dplen))
238 goto err;
239
240 return 1;
241
242 err:
243 OPENSSL_free(dp);
244 ASN1_STRING_free(params);
245 ASN1_STRING_clear_free(prkey);
246 return 0;
247}
248
249static int dh_param_decode(EVP_PKEY *pkey,
250 const unsigned char **pder, int derlen)
251{
252 DH *dh;
253
254 if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL) {
255 DHerr(DH_F_DH_PARAM_DECODE, ERR_R_DH_LIB);
256 return 0;
257 }
258 EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
259 return 1;
260}
261
262static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
263{
264 return i2d_dhp(pkey, pkey->pkey.dh, pder);
265}
266
267static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype)
268{
269 int reason = ERR_R_BUF_LIB;
270 const char *ktype = NULL;
271 BIGNUM *priv_key, *pub_key;
272
273 if (ptype == 2)
274 priv_key = x->priv_key;
275 else
276 priv_key = NULL;
277
278 if (ptype > 0)
279 pub_key = x->pub_key;
280 else
281 pub_key = NULL;
282
283 if (x->p == NULL || (ptype == 2 && priv_key == NULL)
284 || (ptype > 0 && pub_key == NULL)) {
285 reason = ERR_R_PASSED_NULL_PARAMETER;
286 goto err;
287 }
288
289 if (ptype == 2)
290 ktype = "DH Private-Key";
291 else if (ptype == 1)
292 ktype = "DH Public-Key";
293 else
294 ktype = "DH Parameters";
295
296 BIO_indent(bp, indent, 128);
297 if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
298 goto err;
299 indent += 4;
300
301 if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
302 goto err;
303 if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
304 goto err;
305
306 if (!ASN1_bn_print(bp, "prime:", x->p, NULL, indent))
307 goto err;
308 if (!ASN1_bn_print(bp, "generator:", x->g, NULL, indent))
309 goto err;
310 if (x->q && !ASN1_bn_print(bp, "subgroup order:", x->q, NULL, indent))
311 goto err;
312 if (x->j && !ASN1_bn_print(bp, "subgroup factor:", x->j, NULL, indent))
313 goto err;
314 if (x->seed) {
315 int i;
316 BIO_indent(bp, indent, 128);
317 BIO_puts(bp, "seed:");
318 for (i = 0; i < x->seedlen; i++) {
319 if ((i % 15) == 0) {
320 if (BIO_puts(bp, "\n") <= 0
321 || !BIO_indent(bp, indent + 4, 128))
322 goto err;
323 }
324 if (BIO_printf(bp, "%02x%s", x->seed[i],
325 ((i + 1) == x->seedlen) ? "" : ":") <= 0)
326 goto err;
327 }
328 if (BIO_write(bp, "\n", 1) <= 0)
329 return (0);
330 }
331 if (x->counter && !ASN1_bn_print(bp, "counter:", x->counter, NULL, indent))
332 goto err;
333 if (x->length != 0) {
334 BIO_indent(bp, indent, 128);
335 if (BIO_printf(bp, "recommended-private-length: %d bits\n",
336 (int)x->length) <= 0)
337 goto err;
338 }
339
340 return 1;
341
342 err:
343 DHerr(DH_F_DO_DH_PRINT, reason);
344 return 0;
345}
346
347static int int_dh_size(const EVP_PKEY *pkey)
348{
349 return (DH_size(pkey->pkey.dh));
350}
351
352static int dh_bits(const EVP_PKEY *pkey)
353{
354 return BN_num_bits(pkey->pkey.dh->p);
355}
356
357static int dh_security_bits(const EVP_PKEY *pkey)
358{
359 return DH_security_bits(pkey->pkey.dh);
360}
361
362static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
363{
364 if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) ||
365 BN_cmp(a->pkey.dh->g, b->pkey.dh->g))
366 return 0;
367 else if (a->ameth == &dhx_asn1_meth) {
368 if (BN_cmp(a->pkey.dh->q, b->pkey.dh->q))
369 return 0;
370 }
371 return 1;
372}
373
374static int int_dh_bn_cpy(BIGNUM **dst, const BIGNUM *src)
375{
376 BIGNUM *a;
377 if (src) {
378 a = BN_dup(src);
379 if (!a)
380 return 0;
381 } else
382 a = NULL;
383 BN_free(*dst);
384 *dst = a;
385 return 1;
386}
387
388static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
389{
390 if (is_x942 == -1)
391 is_x942 = ! !from->q;
392 if (!int_dh_bn_cpy(&to->p, from->p))
393 return 0;
394 if (!int_dh_bn_cpy(&to->g, from->g))
395 return 0;
396 if (is_x942) {
397 if (!int_dh_bn_cpy(&to->q, from->q))
398 return 0;
399 if (!int_dh_bn_cpy(&to->j, from->j))
400 return 0;
401 OPENSSL_free(to->seed);
402 to->seed = NULL;
403 to->seedlen = 0;
404 if (from->seed) {
405 to->seed = OPENSSL_memdup(from->seed, from->seedlen);
406 if (!to->seed)
407 return 0;
408 to->seedlen = from->seedlen;
409 }
410 } else
411 to->length = from->length;
412 return 1;
413}
414
415DH *DHparams_dup(DH *dh)
416{
417 DH *ret;
418 ret = DH_new();
419 if (ret == NULL)
420 return NULL;
421 if (!int_dh_param_copy(ret, dh, -1)) {
422 DH_free(ret);
423 return NULL;
424 }
425 return ret;
426}
427
428static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
429{
430 if (to->pkey.dh == NULL) {
431 to->pkey.dh = DH_new();
432 if (to->pkey.dh == NULL)
433 return 0;
434 }
435 return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
436 from->ameth == &dhx_asn1_meth);
437}
438
439static int dh_missing_parameters(const EVP_PKEY *a)
440{
441 if (a->pkey.dh == NULL || a->pkey.dh->p == NULL || a->pkey.dh->g == NULL)
442 return 1;
443 return 0;
444}
445
446static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
447{
448 if (dh_cmp_parameters(a, b) == 0)
449 return 0;
450 if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
451 return 0;
452 else
453 return 1;
454}
455
456static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
457 ASN1_PCTX *ctx)
458{
459 return do_dh_print(bp, pkey->pkey.dh, indent, 0);
460}
461
462static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
463 ASN1_PCTX *ctx)
464{
465 return do_dh_print(bp, pkey->pkey.dh, indent, 1);
466}
467
468static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
469 ASN1_PCTX *ctx)
470{
471 return do_dh_print(bp, pkey->pkey.dh, indent, 2);
472}
473
474int DHparams_print(BIO *bp, const DH *x)
475{
476 return do_dh_print(bp, x, 4, 0);
477}
478
479#ifndef OPENSSL_NO_CMS
480static int dh_cms_decrypt(CMS_RecipientInfo *ri);
481static int dh_cms_encrypt(CMS_RecipientInfo *ri);
482#endif
483
484static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
485{
486 switch (op) {
487#ifndef OPENSSL_NO_CMS
488
489 case ASN1_PKEY_CTRL_CMS_ENVELOPE:
490 if (arg1 == 1)
491 return dh_cms_decrypt(arg2);
492 else if (arg1 == 0)
493 return dh_cms_encrypt(arg2);
494 return -2;
495
496 case ASN1_PKEY_CTRL_CMS_RI_TYPE:
497 *(int *)arg2 = CMS_RECIPINFO_AGREE;
498 return 1;
499#endif
500 default:
501 return -2;
502 }
503
504}
505
506const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
507 EVP_PKEY_DH,
508 EVP_PKEY_DH,
509 0,
510
511 "DH",
512 "OpenSSL PKCS#3 DH method",
513
514 dh_pub_decode,
515 dh_pub_encode,
516 dh_pub_cmp,
517 dh_public_print,
518
519 dh_priv_decode,
520 dh_priv_encode,
521 dh_private_print,
522
523 int_dh_size,
524 dh_bits,
525 dh_security_bits,
526
527 dh_param_decode,
528 dh_param_encode,
529 dh_missing_parameters,
530 dh_copy_parameters,
531 dh_cmp_parameters,
532 dh_param_print,
533 0,
534
535 int_dh_free,
536 0
537};
538
539const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = {
540 EVP_PKEY_DHX,
541 EVP_PKEY_DHX,
542 0,
543
544 "X9.42 DH",
545 "OpenSSL X9.42 DH method",
546
547 dh_pub_decode,
548 dh_pub_encode,
549 dh_pub_cmp,
550 dh_public_print,
551
552 dh_priv_decode,
553 dh_priv_encode,
554 dh_private_print,
555
556 int_dh_size,
557 dh_bits,
558 dh_security_bits,
559
560 dh_param_decode,
561 dh_param_encode,
562 dh_missing_parameters,
563 dh_copy_parameters,
564 dh_cmp_parameters,
565 dh_param_print,
566 0,
567
568 int_dh_free,
569 dh_pkey_ctrl
570};
571
572#ifndef OPENSSL_NO_CMS
573
574static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
575 X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
576{
577 const ASN1_OBJECT *aoid;
578 int atype;
579 const void *aval;
580 ASN1_INTEGER *public_key = NULL;
581 int rv = 0;
582 EVP_PKEY *pkpeer = NULL, *pk = NULL;
583 DH *dhpeer = NULL;
584 const unsigned char *p;
585 int plen;
586
587 X509_ALGOR_get0(&aoid, &atype, &aval, alg);
588 if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
589 goto err;
590 /* Only absent parameters allowed in RFC XXXX */
591 if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
592 goto err;
593
594 pk = EVP_PKEY_CTX_get0_pkey(pctx);
595 if (!pk)
596 goto err;
597 if (pk->type != EVP_PKEY_DHX)
598 goto err;
599 /* Get parameters from parent key */
600 dhpeer = DHparams_dup(pk->pkey.dh);
601 /* We have parameters now set public key */
602 plen = ASN1_STRING_length(pubkey);
603 p = ASN1_STRING_get0_data(pubkey);
604 if (!p || !plen)
605 goto err;
606
607 if ((public_key = d2i_ASN1_INTEGER(NULL, &p, plen)) == NULL) {
608 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR);
609 goto err;
610 }
611
612 /* We have parameters now set public key */
613 if ((dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
614 DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR);
615 goto err;
616 }
617
618 pkpeer = EVP_PKEY_new();
619 if (pkpeer == NULL)
620 goto err;
621 EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer);
622 dhpeer = NULL;
623 if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
624 rv = 1;
625 err:
626 ASN1_INTEGER_free(public_key);
627 EVP_PKEY_free(pkpeer);
628 DH_free(dhpeer);
629 return rv;
630}
631
632static int dh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
633{
634 int rv = 0;
635
636 X509_ALGOR *alg, *kekalg = NULL;
637 ASN1_OCTET_STRING *ukm;
638 const unsigned char *p;
639 unsigned char *dukm = NULL;
640 size_t dukmlen = 0;
641 int keylen, plen;
642 const EVP_CIPHER *kekcipher;
643 EVP_CIPHER_CTX *kekctx;
644
645 if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
646 goto err;
647
648 /*
649 * For DH we only have one OID permissible. If ever any more get defined
650 * we will need something cleverer.
651 */
652 if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) {
653 DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR);
654 goto err;
655 }
656
657 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0)
658 goto err;
659
660 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
661 goto err;
662
663 if (alg->parameter->type != V_ASN1_SEQUENCE)
664 goto err;
665
666 p = alg->parameter->value.sequence->data;
667 plen = alg->parameter->value.sequence->length;
668 kekalg = d2i_X509_ALGOR(NULL, &p, plen);
669 if (!kekalg)
670 goto err;
671 kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
672 if (!kekctx)
673 goto err;
674 kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
675 if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
676 goto err;
677 if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
678 goto err;
679 if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
680 goto err;
681
682 keylen = EVP_CIPHER_CTX_key_length(kekctx);
683 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
684 goto err;
685 /* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
686 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
687 OBJ_nid2obj(EVP_CIPHER_type(kekcipher)))
688 <= 0)
689 goto err;
690
691 if (ukm) {
692 dukmlen = ASN1_STRING_length(ukm);
693 dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
694 if (!dukm)
695 goto err;
696 }
697
698 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
699 goto err;
700 dukm = NULL;
701
702 rv = 1;
703 err:
704 X509_ALGOR_free(kekalg);
705 OPENSSL_free(dukm);
706 return rv;
707}
708
709static int dh_cms_decrypt(CMS_RecipientInfo *ri)
710{
711 EVP_PKEY_CTX *pctx;
712 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
713 if (!pctx)
714 return 0;
715 /* See if we need to set peer key */
716 if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
717 X509_ALGOR *alg;
718 ASN1_BIT_STRING *pubkey;
719 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
720 NULL, NULL, NULL))
721 return 0;
722 if (!alg || !pubkey)
723 return 0;
724 if (!dh_cms_set_peerkey(pctx, alg, pubkey)) {
725 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR);
726 return 0;
727 }
728 }
729 /* Set DH derivation parameters and initialise unwrap context */
730 if (!dh_cms_set_shared_info(pctx, ri)) {
731 DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
732 return 0;
733 }
734 return 1;
735}
736
737static int dh_cms_encrypt(CMS_RecipientInfo *ri)
738{
739 EVP_PKEY_CTX *pctx;
740 EVP_PKEY *pkey;
741 EVP_CIPHER_CTX *ctx;
742 int keylen;
743 X509_ALGOR *talg, *wrap_alg = NULL;
744 const ASN1_OBJECT *aoid;
745 ASN1_BIT_STRING *pubkey;
746 ASN1_STRING *wrap_str;
747 ASN1_OCTET_STRING *ukm;
748 unsigned char *penc = NULL, *dukm = NULL;
749 int penclen;
750 size_t dukmlen = 0;
751 int rv = 0;
752 int kdf_type, wrap_nid;
753 const EVP_MD *kdf_md;
754 pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
755 if (!pctx)
756 return 0;
757 /* Get ephemeral key */
758 pkey = EVP_PKEY_CTX_get0_pkey(pctx);
759 if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
760 NULL, NULL, NULL))
761 goto err;
762 X509_ALGOR_get0(&aoid, NULL, NULL, talg);
763 /* Is everything uninitialised? */
764 if (aoid == OBJ_nid2obj(NID_undef)) {
765 ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
766 if (!pubk)
767 goto err;
768 /* Set the key */
769
770 penclen = i2d_ASN1_INTEGER(pubk, &penc);
771 ASN1_INTEGER_free(pubk);
772 if (penclen <= 0)
773 goto err;
774 ASN1_STRING_set0(pubkey, penc, penclen);
775 pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
776 pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
777
778 penc = NULL;
779 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
780 V_ASN1_UNDEF, NULL);
781 }
782
783 /* See if custom parameters set */
784 kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
785 if (kdf_type <= 0)
786 goto err;
787 if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
788 goto err;
789
790 if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
791 kdf_type = EVP_PKEY_DH_KDF_X9_42;
792 if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
793 goto err;
794 } else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
795 /* Unknown KDF */
796 goto err;
797 if (kdf_md == NULL) {
798 /* Only SHA1 supported */
799 kdf_md = EVP_sha1();
800 if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
801 goto err;
802 } else if (EVP_MD_type(kdf_md) != NID_sha1)
803 /* Unsupported digest */
804 goto err;
805
806 if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
807 goto err;
808
809 /* Get wrap NID */
810 ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
811 wrap_nid = EVP_CIPHER_CTX_type(ctx);
812 if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
813 goto err;
814 keylen = EVP_CIPHER_CTX_key_length(ctx);
815
816 /* Package wrap algorithm in an AlgorithmIdentifier */
817
818 wrap_alg = X509_ALGOR_new();
819 if (wrap_alg == NULL)
820 goto err;
821 wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
822 wrap_alg->parameter = ASN1_TYPE_new();
823 if (wrap_alg->parameter == NULL)
824 goto err;
825 if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
826 goto err;
827 if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
828 ASN1_TYPE_free(wrap_alg->parameter);
829 wrap_alg->parameter = NULL;
830 }
831
832 if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
833 goto err;
834
835 if (ukm) {
836 dukmlen = ASN1_STRING_length(ukm);
837 dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
838 if (!dukm)
839 goto err;
840 }
841
842 if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
843 goto err;
844 dukm = NULL;
845
846 /*
847 * Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
848 * of another AlgorithmIdentifier.
849 */
850 penc = NULL;
851 penclen = i2d_X509_ALGOR(wrap_alg, &penc);
852 if (!penc || !penclen)
853 goto err;
854 wrap_str = ASN1_STRING_new();
855 if (wrap_str == NULL)
856 goto err;
857 ASN1_STRING_set0(wrap_str, penc, penclen);
858 penc = NULL;
859 X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
860 V_ASN1_SEQUENCE, wrap_str);
861
862 rv = 1;
863
864 err:
865 OPENSSL_free(penc);
866 X509_ALGOR_free(wrap_alg);
867 return rv;
868}
869
870#endif
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