dh_ameth.c@ 91772

Last change on this file since 91772 was 91772, checked in by vboxsync, 3 years ago
openssl-1.1.1l: Applied and adjusted our OpenSSL changes to 1.1.1l. bugref:10126
File size: 22.4 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_local.h"
15	#include <openssl/bn.h>
16	#include "crypto/asn1.h"
17	#include "crypto/evp.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
25	static 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
33	static 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
40	static void int_dh_free(EVP_PKEY *pkey)
41	{
42	DH_free(pkey->pkey.dh);
43	}
44
45	static 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
97	static 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
150	static 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
202	static 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
249	static 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
262	static int dh_param_encode(const EVP_PKEY pkey, unsigned char *pder)
263	{
264	return i2d_dhp(pkey, pkey->pkey.dh, pder);
265	}
266
267	static 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
347	static int int_dh_size(const EVP_PKEY *pkey)
348	{
349	return DH_size(pkey->pkey.dh);
350	}
351
352	static int dh_bits(const EVP_PKEY *pkey)
353	{
354	return BN_num_bits(pkey->pkey.dh->p);
355	}
356
357	static int dh_security_bits(const EVP_PKEY *pkey)
358	{
359	return DH_security_bits(pkey->pkey.dh);
360	}
361
362	static 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
374	static int int_dh_bn_cpy(BIGNUM *dst, const BIGNUM src)
375	{
376	BIGNUM *a;
377
378	/*
379	* If source is read only just copy the pointer, so
380	* we don't have to reallocate it.
381	*/
382	if (src == NULL)
383	a = NULL;
384	else if (BN_get_flags(src, BN_FLG_STATIC_DATA)
385	&& !BN_get_flags(src, BN_FLG_MALLOCED))
386	a = (BIGNUM *)src;
387	else if ((a = BN_dup(src)) == NULL)
388	return 0;
389	BN_clear_free(*dst);
390	*dst = a;
391	return 1;
392	}
393
394	static int int_dh_param_copy(DH to, const DH from, int is_x942)
395	{
396	if (is_x942 == -1)
397	is_x942 = ! !from->q;
398	if (!int_dh_bn_cpy(&to->p, from->p))
399	return 0;
400	if (!int_dh_bn_cpy(&to->g, from->g))
401	return 0;
402	if (is_x942) {
403	if (!int_dh_bn_cpy(&to->q, from->q))
404	return 0;
405	if (!int_dh_bn_cpy(&to->j, from->j))
406	return 0;
407	OPENSSL_free(to->seed);
408	to->seed = NULL;
409	to->seedlen = 0;
410	if (from->seed) {
411	to->seed = OPENSSL_memdup(from->seed, from->seedlen);
412	if (!to->seed)
413	return 0;
414	to->seedlen = from->seedlen;
415	}
416	} else
417	to->length = from->length;
418	return 1;
419	}
420
421	DH DHparams_dup(DH dh)
422	{
423	DH *ret;
424	ret = DH_new();
425	if (ret == NULL)
426	return NULL;
427	if (!int_dh_param_copy(ret, dh, -1)) {
428	DH_free(ret);
429	return NULL;
430	}
431	return ret;
432	}
433
434	static int dh_copy_parameters(EVP_PKEY to, const EVP_PKEY from)
435	{
436	if (to->pkey.dh == NULL) {
437	to->pkey.dh = DH_new();
438	if (to->pkey.dh == NULL)
439	return 0;
440	}
441	return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
442	from->ameth == &dhx_asn1_meth);
443	}
444
445	static int dh_missing_parameters(const EVP_PKEY *a)
446	{
447	if (a->pkey.dh == NULL \|\| a->pkey.dh->p == NULL \|\| a->pkey.dh->g == NULL)
448	return 1;
449	return 0;
450	}
451
452	static int dh_pub_cmp(const EVP_PKEY a, const EVP_PKEY b)
453	{
454	if (dh_cmp_parameters(a, b) == 0)
455	return 0;
456	if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
457	return 0;
458	else
459	return 1;
460	}
461
462	static int dh_param_print(BIO bp, const EVP_PKEY pkey, int indent,
463	ASN1_PCTX *ctx)
464	{
465	return do_dh_print(bp, pkey->pkey.dh, indent, 0);
466	}
467
468	static int dh_public_print(BIO bp, const EVP_PKEY pkey, int indent,
469	ASN1_PCTX *ctx)
470	{
471	return do_dh_print(bp, pkey->pkey.dh, indent, 1);
472	}
473
474	static int dh_private_print(BIO bp, const EVP_PKEY pkey, int indent,
475	ASN1_PCTX *ctx)
476	{
477	return do_dh_print(bp, pkey->pkey.dh, indent, 2);
478	}
479
480	int DHparams_print(BIO bp, const DH x)
481	{
482	return do_dh_print(bp, x, 4, 0);
483	}
484
485	#ifndef OPENSSL_NO_CMS
486	static int dh_cms_decrypt(CMS_RecipientInfo *ri);
487	static int dh_cms_encrypt(CMS_RecipientInfo *ri);
488	#endif
489
490	static int dh_pkey_ctrl(EVP_PKEY pkey, int op, long arg1, void arg2)
491	{
492	switch (op) {
493	#ifndef OPENSSL_NO_CMS
494
495	case ASN1_PKEY_CTRL_CMS_ENVELOPE:
496	if (arg1 == 1)
497	return dh_cms_decrypt(arg2);
498	else if (arg1 == 0)
499	return dh_cms_encrypt(arg2);
500	return -2;
501
502	case ASN1_PKEY_CTRL_CMS_RI_TYPE:
503	(int )arg2 = CMS_RECIPINFO_AGREE;
504	return 1;
505	#endif
506	default:
507	return -2;
508	}
509
510	}
511
512	static int dh_pkey_public_check(const EVP_PKEY *pkey)
513	{
514	DH *dh = pkey->pkey.dh;
515
516	if (dh->pub_key == NULL) {
517	DHerr(DH_F_DH_PKEY_PUBLIC_CHECK, DH_R_MISSING_PUBKEY);
518	return 0;
519	}
520
521	return DH_check_pub_key_ex(dh, dh->pub_key);
522	}
523
524	static int dh_pkey_param_check(const EVP_PKEY *pkey)
525	{
526	DH *dh = pkey->pkey.dh;
527
528	return DH_check_ex(dh);
529	}
530
531	const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
532	EVP_PKEY_DH,
533	EVP_PKEY_DH,
534	0,
535
536	"DH",
537	"OpenSSL PKCS#3 DH method",
538
539	dh_pub_decode,
540	dh_pub_encode,
541	dh_pub_cmp,
542	dh_public_print,
543
544	dh_priv_decode,
545	dh_priv_encode,
546	dh_private_print,
547
548	int_dh_size,
549	dh_bits,
550	dh_security_bits,
551
552	dh_param_decode,
553	dh_param_encode,
554	dh_missing_parameters,
555	dh_copy_parameters,
556	dh_cmp_parameters,
557	dh_param_print,
558	0,
559
560	int_dh_free,
561	0,
562
563	0, 0, 0, 0, 0,
564
565	0,
566	dh_pkey_public_check,
567	dh_pkey_param_check
568	};
569
570	const EVP_PKEY_ASN1_METHOD dhx_asn1_meth = {
571	EVP_PKEY_DHX,
572	EVP_PKEY_DHX,
573	0,
574
575	"X9.42 DH",
576	"OpenSSL X9.42 DH method",
577
578	dh_pub_decode,
579	dh_pub_encode,
580	dh_pub_cmp,
581	dh_public_print,
582
583	dh_priv_decode,
584	dh_priv_encode,
585	dh_private_print,
586
587	int_dh_size,
588	dh_bits,
589	dh_security_bits,
590
591	dh_param_decode,
592	dh_param_encode,
593	dh_missing_parameters,
594	dh_copy_parameters,
595	dh_cmp_parameters,
596	dh_param_print,
597	0,
598
599	int_dh_free,
600	dh_pkey_ctrl,
601
602	0, 0, 0, 0, 0,
603
604	0,
605	dh_pkey_public_check,
606	dh_pkey_param_check
607	};
608
609	#ifndef OPENSSL_NO_CMS
610
611	static int dh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
612	X509_ALGOR alg, ASN1_BIT_STRING pubkey)
613	{
614	const ASN1_OBJECT *aoid;
615	int atype;
616	const void *aval;
617	ASN1_INTEGER *public_key = NULL;
618	int rv = 0;
619	EVP_PKEY pkpeer = NULL, pk = NULL;
620	DH *dhpeer = NULL;
621	const unsigned char *p;
622	int plen;
623
624	X509_ALGOR_get0(&aoid, &atype, &aval, alg);
625	if (OBJ_obj2nid(aoid) != NID_dhpublicnumber)
626	goto err;
627	/* Only absent parameters allowed in RFC XXXX */
628	if (atype != V_ASN1_UNDEF && atype == V_ASN1_NULL)
629	goto err;
630
631	pk = EVP_PKEY_CTX_get0_pkey(pctx);
632	if (!pk)
633	goto err;
634	if (pk->type != EVP_PKEY_DHX)
635	goto err;
636	/* Get parameters from parent key */
637	dhpeer = DHparams_dup(pk->pkey.dh);
638	/* We have parameters now set public key */
639	plen = ASN1_STRING_length(pubkey);
640	p = ASN1_STRING_get0_data(pubkey);
641	if (!p \|\| !plen)
642	goto err;
643
644	if ((public_key = d2i_ASN1_INTEGER(NULL, &p, plen)) == NULL) {
645	DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_DECODE_ERROR);
646	goto err;
647	}
648
649	/* We have parameters now set public key */
650	if ((dhpeer->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
651	DHerr(DH_F_DH_CMS_SET_PEERKEY, DH_R_BN_DECODE_ERROR);
652	goto err;
653	}
654
655	pkpeer = EVP_PKEY_new();
656	if (pkpeer == NULL)
657	goto err;
658	EVP_PKEY_assign(pkpeer, pk->ameth->pkey_id, dhpeer);
659	dhpeer = NULL;
660	if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
661	rv = 1;
662	err:
663	ASN1_INTEGER_free(public_key);
664	EVP_PKEY_free(pkpeer);
665	DH_free(dhpeer);
666	return rv;
667	}
668
669	static int dh_cms_set_shared_info(EVP_PKEY_CTX pctx, CMS_RecipientInfo ri)
670	{
671	int rv = 0;
672
673	X509_ALGOR alg, kekalg = NULL;
674	ASN1_OCTET_STRING *ukm;
675	const unsigned char *p;
676	unsigned char *dukm = NULL;
677	size_t dukmlen = 0;
678	int keylen, plen;
679	const EVP_CIPHER *kekcipher;
680	EVP_CIPHER_CTX *kekctx;
681
682	if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
683	goto err;
684
685	/*
686	* For DH we only have one OID permissible. If ever any more get defined
687	* we will need something cleverer.
688	*/
689	if (OBJ_obj2nid(alg->algorithm) != NID_id_smime_alg_ESDH) {
690	DHerr(DH_F_DH_CMS_SET_SHARED_INFO, DH_R_KDF_PARAMETER_ERROR);
691	goto err;
692	}
693
694	if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, EVP_PKEY_DH_KDF_X9_42) <= 0)
695	goto err;
696
697	if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, EVP_sha1()) <= 0)
698	goto err;
699
700	if (alg->parameter->type != V_ASN1_SEQUENCE)
701	goto err;
702
703	p = alg->parameter->value.sequence->data;
704	plen = alg->parameter->value.sequence->length;
705	kekalg = d2i_X509_ALGOR(NULL, &p, plen);
706	if (!kekalg)
707	goto err;
708	kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
709	if (!kekctx)
710	goto err;
711	kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
712	if (!kekcipher \|\| EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
713	goto err;
714	if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
715	goto err;
716	if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
717	goto err;
718
719	keylen = EVP_CIPHER_CTX_key_length(kekctx);
720	if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
721	goto err;
722	/* Use OBJ_nid2obj to ensure we use built in OID that isn't freed */
723	if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx,
724	OBJ_nid2obj(EVP_CIPHER_type(kekcipher)))
725	<= 0)
726	goto err;
727
728	if (ukm) {
729	dukmlen = ASN1_STRING_length(ukm);
730	dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
731	if (!dukm)
732	goto err;
733	}
734
735	if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
736	goto err;
737	dukm = NULL;
738
739	rv = 1;
740	err:
741	X509_ALGOR_free(kekalg);
742	OPENSSL_free(dukm);
743	return rv;
744	}
745
746	static int dh_cms_decrypt(CMS_RecipientInfo *ri)
747	{
748	EVP_PKEY_CTX *pctx;
749	pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
750	if (!pctx)
751	return 0;
752	/* See if we need to set peer key */
753	if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
754	X509_ALGOR *alg;
755	ASN1_BIT_STRING *pubkey;
756	if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
757	NULL, NULL, NULL))
758	return 0;
759	if (!alg \|\| !pubkey)
760	return 0;
761	if (!dh_cms_set_peerkey(pctx, alg, pubkey)) {
762	DHerr(DH_F_DH_CMS_DECRYPT, DH_R_PEER_KEY_ERROR);
763	return 0;
764	}
765	}
766	/* Set DH derivation parameters and initialise unwrap context */
767	if (!dh_cms_set_shared_info(pctx, ri)) {
768	DHerr(DH_F_DH_CMS_DECRYPT, DH_R_SHARED_INFO_ERROR);
769	return 0;
770	}
771	return 1;
772	}
773
774	static int dh_cms_encrypt(CMS_RecipientInfo *ri)
775	{
776	EVP_PKEY_CTX *pctx;
777	EVP_PKEY *pkey;
778	EVP_CIPHER_CTX *ctx;
779	int keylen;
780	X509_ALGOR talg, wrap_alg = NULL;
781	const ASN1_OBJECT *aoid;
782	ASN1_BIT_STRING *pubkey;
783	ASN1_STRING *wrap_str;
784	ASN1_OCTET_STRING *ukm;
785	unsigned char penc = NULL, dukm = NULL;
786	int penclen;
787	size_t dukmlen = 0;
788	int rv = 0;
789	int kdf_type, wrap_nid;
790	const EVP_MD *kdf_md;
791	pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
792	if (!pctx)
793	return 0;
794	/* Get ephemeral key */
795	pkey = EVP_PKEY_CTX_get0_pkey(pctx);
796	if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
797	NULL, NULL, NULL))
798	goto err;
799	X509_ALGOR_get0(&aoid, NULL, NULL, talg);
800	/* Is everything uninitialised? */
801	if (aoid == OBJ_nid2obj(NID_undef)) {
802	ASN1_INTEGER *pubk = BN_to_ASN1_INTEGER(pkey->pkey.dh->pub_key, NULL);
803	if (!pubk)
804	goto err;
805	/* Set the key */
806
807	penclen = i2d_ASN1_INTEGER(pubk, &penc);
808	ASN1_INTEGER_free(pubk);
809	if (penclen <= 0)
810	goto err;
811	ASN1_STRING_set0(pubkey, penc, penclen);
812	pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT \| 0x07);
813	pubkey->flags \|= ASN1_STRING_FLAG_BITS_LEFT;
814
815	penc = NULL;
816	X509_ALGOR_set0(talg, OBJ_nid2obj(NID_dhpublicnumber),
817	V_ASN1_UNDEF, NULL);
818	}
819
820	/* See if custom parameters set */
821	kdf_type = EVP_PKEY_CTX_get_dh_kdf_type(pctx);
822	if (kdf_type <= 0)
823	goto err;
824	if (!EVP_PKEY_CTX_get_dh_kdf_md(pctx, &kdf_md))
825	goto err;
826
827	if (kdf_type == EVP_PKEY_DH_KDF_NONE) {
828	kdf_type = EVP_PKEY_DH_KDF_X9_42;
829	if (EVP_PKEY_CTX_set_dh_kdf_type(pctx, kdf_type) <= 0)
830	goto err;
831	} else if (kdf_type != EVP_PKEY_DH_KDF_X9_42)
832	/* Unknown KDF */
833	goto err;
834	if (kdf_md == NULL) {
835	/* Only SHA1 supported */
836	kdf_md = EVP_sha1();
837	if (EVP_PKEY_CTX_set_dh_kdf_md(pctx, kdf_md) <= 0)
838	goto err;
839	} else if (EVP_MD_type(kdf_md) != NID_sha1)
840	/* Unsupported digest */
841	goto err;
842
843	if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
844	goto err;
845
846	/* Get wrap NID */
847	ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
848	wrap_nid = EVP_CIPHER_CTX_type(ctx);
849	if (EVP_PKEY_CTX_set0_dh_kdf_oid(pctx, OBJ_nid2obj(wrap_nid)) <= 0)
850	goto err;
851	keylen = EVP_CIPHER_CTX_key_length(ctx);
852
853	/* Package wrap algorithm in an AlgorithmIdentifier */
854
855	wrap_alg = X509_ALGOR_new();
856	if (wrap_alg == NULL)
857	goto err;
858	wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
859	wrap_alg->parameter = ASN1_TYPE_new();
860	if (wrap_alg->parameter == NULL)
861	goto err;
862	if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
863	goto err;
864	if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
865	ASN1_TYPE_free(wrap_alg->parameter);
866	wrap_alg->parameter = NULL;
867	}
868
869	if (EVP_PKEY_CTX_set_dh_kdf_outlen(pctx, keylen) <= 0)
870	goto err;
871
872	if (ukm) {
873	dukmlen = ASN1_STRING_length(ukm);
874	dukm = OPENSSL_memdup(ASN1_STRING_get0_data(ukm), dukmlen);
875	if (!dukm)
876	goto err;
877	}
878
879	if (EVP_PKEY_CTX_set0_dh_kdf_ukm(pctx, dukm, dukmlen) <= 0)
880	goto err;
881	dukm = NULL;
882
883	/*
884	* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
885	* of another AlgorithmIdentifier.
886	*/
887	penc = NULL;
888	penclen = i2d_X509_ALGOR(wrap_alg, &penc);
889	if (!penc \|\| !penclen)
890	goto err;
891	wrap_str = ASN1_STRING_new();
892	if (wrap_str == NULL)
893	goto err;
894	ASN1_STRING_set0(wrap_str, penc, penclen);
895	penc = NULL;
896	X509_ALGOR_set0(talg, OBJ_nid2obj(NID_id_smime_alg_ESDH),
897	V_ASN1_SEQUENCE, wrap_str);
898
899	rv = 1;
900
901	err:
902	OPENSSL_free(penc);
903	X509_ALGOR_free(wrap_alg);
904	OPENSSL_free(dukm);
905	return rv;
906	}
907
908	#endif

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source: vbox/trunk/src/libs/openssl-1.1.1l/crypto/dh/dh_ameth.c@ 91772

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