ec_backend.c@ 102427

Last change on this file since 102427 was 101211, checked in by vboxsync, 17 months ago
openssl-3.1.3: Applied and adjusted our OpenSSL changes to 3.1.2. bugref:10527
File size: 24.7 KB

Line
1	/*
2	* Copyright 2020-2022 The OpenSSL Project Authors. All Rights Reserved.
3	*
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
8	*/
9
10	/*
11	* Low level APIs related to EC_KEY are deprecated for public use,
12	* but still ok for internal use.
13	*/
14	#include "internal/deprecated.h"
15
16	#include <openssl/core_names.h>
17	#include <openssl/objects.h>
18	#include <openssl/params.h>
19	#include <openssl/err.h>
20	#ifndef FIPS_MODULE
21	# include <openssl/engine.h>
22	# include <openssl/x509.h>
23	#endif
24	#include "crypto/bn.h"
25	#include "crypto/ec.h"
26	#include "ec_local.h"
27	#include "internal/e_os.h"
28	#include "internal/nelem.h"
29	#include "internal/param_build_set.h"
30
31	/* Mapping between a flag and a name */
32	static const OSSL_ITEM encoding_nameid_map[] = {
33	{ OPENSSL_EC_EXPLICIT_CURVE, OSSL_PKEY_EC_ENCODING_EXPLICIT },
34	{ OPENSSL_EC_NAMED_CURVE, OSSL_PKEY_EC_ENCODING_GROUP },
35	};
36
37	static const OSSL_ITEM check_group_type_nameid_map[] = {
38	{ 0, OSSL_PKEY_EC_GROUP_CHECK_DEFAULT },
39	{ EC_FLAG_CHECK_NAMED_GROUP, OSSL_PKEY_EC_GROUP_CHECK_NAMED },
40	{ EC_FLAG_CHECK_NAMED_GROUP_NIST, OSSL_PKEY_EC_GROUP_CHECK_NAMED_NIST },
41	};
42
43	static const OSSL_ITEM format_nameid_map[] = {
44	{ (int)POINT_CONVERSION_UNCOMPRESSED, OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_UNCOMPRESSED },
45	{ (int)POINT_CONVERSION_COMPRESSED, OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_COMPRESSED },
46	{ (int)POINT_CONVERSION_HYBRID, OSSL_PKEY_EC_POINT_CONVERSION_FORMAT_HYBRID },
47	};
48
49	int ossl_ec_encoding_name2id(const char *name)
50	{
51	size_t i, sz;
52
53	/* Return the default value if there is no name */
54	if (name == NULL)
55	return OPENSSL_EC_NAMED_CURVE;
56
57	for (i = 0, sz = OSSL_NELEM(encoding_nameid_map); i < sz; i++) {
58	if (OPENSSL_strcasecmp(name, encoding_nameid_map[i].ptr) == 0)
59	return encoding_nameid_map[i].id;
60	}
61	return -1;
62	}
63
64	static char *ec_param_encoding_id2name(int id)
65	{
66	size_t i, sz;
67
68	for (i = 0, sz = OSSL_NELEM(encoding_nameid_map); i < sz; i++) {
69	if (id == (int)encoding_nameid_map[i].id)
70	return encoding_nameid_map[i].ptr;
71	}
72	return NULL;
73	}
74
75	char *ossl_ec_check_group_type_id2name(int id)
76	{
77	size_t i, sz;
78
79	for (i = 0, sz = OSSL_NELEM(check_group_type_nameid_map); i < sz; i++) {
80	if (id == (int)check_group_type_nameid_map[i].id)
81	return check_group_type_nameid_map[i].ptr;
82	}
83	return NULL;
84	}
85
86	static int ec_check_group_type_name2id(const char *name)
87	{
88	size_t i, sz;
89
90	/* Return the default value if there is no name */
91	if (name == NULL)
92	return 0;
93
94	for (i = 0, sz = OSSL_NELEM(check_group_type_nameid_map); i < sz; i++) {
95	if (OPENSSL_strcasecmp(name, check_group_type_nameid_map[i].ptr) == 0)
96	return check_group_type_nameid_map[i].id;
97	}
98	return -1;
99	}
100
101	int ossl_ec_set_check_group_type_from_name(EC_KEY ec, const char name)
102	{
103	int flags = ec_check_group_type_name2id(name);
104
105	if (flags == -1)
106	return 0;
107	EC_KEY_clear_flags(ec, EC_FLAG_CHECK_NAMED_GROUP_MASK);
108	EC_KEY_set_flags(ec, flags);
109	return 1;
110	}
111
112	static int ec_set_check_group_type_from_param(EC_KEY ec, const OSSL_PARAM p)
113	{
114	const char *name = NULL;
115	int status = 0;
116
117	switch (p->data_type) {
118	case OSSL_PARAM_UTF8_STRING:
119	name = p->data;
120	status = (name != NULL);
121	break;
122	case OSSL_PARAM_UTF8_PTR:
123	status = OSSL_PARAM_get_utf8_ptr(p, &name);
124	break;
125	}
126	if (status)
127	return ossl_ec_set_check_group_type_from_name(ec, name);
128	return 0;
129	}
130
131	int ossl_ec_pt_format_name2id(const char *name)
132	{
133	size_t i, sz;
134
135	/* Return the default value if there is no name */
136	if (name == NULL)
137	return (int)POINT_CONVERSION_UNCOMPRESSED;
138
139	for (i = 0, sz = OSSL_NELEM(format_nameid_map); i < sz; i++) {
140	if (OPENSSL_strcasecmp(name, format_nameid_map[i].ptr) == 0)
141	return format_nameid_map[i].id;
142	}
143	return -1;
144	}
145
146	char *ossl_ec_pt_format_id2name(int id)
147	{
148	size_t i, sz;
149
150	for (i = 0, sz = OSSL_NELEM(format_nameid_map); i < sz; i++) {
151	if (id == (int)format_nameid_map[i].id)
152	return format_nameid_map[i].ptr;
153	}
154	return NULL;
155	}
156
157	static int ec_group_explicit_todata(const EC_GROUP group, OSSL_PARAM_BLD tmpl,
158	OSSL_PARAM params[], BN_CTX *bnctx,
159	unsigned char **genbuf)
160	{
161	int ret = 0, fid;
162	const char *field_type;
163	const OSSL_PARAM *param = NULL;
164	const OSSL_PARAM *param_p = NULL;
165	const OSSL_PARAM *param_a = NULL;
166	const OSSL_PARAM *param_b = NULL;
167
168	fid = EC_GROUP_get_field_type(group);
169
170	if (fid == NID_X9_62_prime_field) {
171	field_type = SN_X9_62_prime_field;
172	} else if (fid == NID_X9_62_characteristic_two_field) {
173	#ifdef OPENSSL_NO_EC2M
174	ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
175	goto err;
176	#else
177	field_type = SN_X9_62_characteristic_two_field;
178	#endif
179	} else {
180	ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
181	return 0;
182	}
183
184	param_p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_P);
185	param_a = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_A);
186	param_b = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_B);
187	if (tmpl != NULL \|\| param_p != NULL \|\| param_a != NULL \|\| param_b != NULL)
188	{
189	BIGNUM *p = BN_CTX_get(bnctx);
190	BIGNUM *a = BN_CTX_get(bnctx);
191	BIGNUM *b = BN_CTX_get(bnctx);
192
193	if (b == NULL) {
194	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
195	goto err;
196	}
197
198	if (!EC_GROUP_get_curve(group, p, a, b, bnctx)) {
199	ERR_raise(ERR_LIB_EC, EC_R_INVALID_CURVE);
200	goto err;
201	}
202	if (!ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_P, p)
203	\|\| !ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_A, a)
204	\|\| !ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_B, b)) {
205	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
206	goto err;
207	}
208	}
209
210	param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ORDER);
211	if (tmpl != NULL \|\| param != NULL) {
212	const BIGNUM *order = EC_GROUP_get0_order(group);
213
214	if (order == NULL) {
215	ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
216	goto err;
217	}
218	if (!ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_ORDER,
219	order)) {
220	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
221	goto err;
222	}
223	}
224
225	param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE);
226	if (tmpl != NULL \|\| param != NULL) {
227	if (!ossl_param_build_set_utf8_string(tmpl, params,
228	OSSL_PKEY_PARAM_EC_FIELD_TYPE,
229	field_type)) {
230	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
231	goto err;
232	}
233	}
234
235	param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GENERATOR);
236	if (tmpl != NULL \|\| param != NULL) {
237	size_t genbuf_len;
238	const EC_POINT *genpt = EC_GROUP_get0_generator(group);
239	point_conversion_form_t genform = EC_GROUP_get_point_conversion_form(group);
240
241	if (genpt == NULL) {
242	ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
243	goto err;
244	}
245	genbuf_len = EC_POINT_point2buf(group, genpt, genform, genbuf, bnctx);
246	if (genbuf_len == 0) {
247	ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
248	goto err;
249	}
250	if (!ossl_param_build_set_octet_string(tmpl, params,
251	OSSL_PKEY_PARAM_EC_GENERATOR,
252	*genbuf, genbuf_len)) {
253	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
254	goto err;
255	}
256	}
257
258	param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_COFACTOR);
259	if (tmpl != NULL \|\| param != NULL) {
260	const BIGNUM *cofactor = EC_GROUP_get0_cofactor(group);
261
262	if (cofactor != NULL
263	&& !ossl_param_build_set_bn(tmpl, params,
264	OSSL_PKEY_PARAM_EC_COFACTOR, cofactor)) {
265	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
266	goto err;
267	}
268	}
269
270	param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED);
271	if (tmpl != NULL \|\| param != NULL) {
272	unsigned char *seed = EC_GROUP_get0_seed(group);
273	size_t seed_len = EC_GROUP_get_seed_len(group);
274
275	if (seed != NULL
276	&& seed_len > 0
277	&& !ossl_param_build_set_octet_string(tmpl, params,
278	OSSL_PKEY_PARAM_EC_SEED,
279	seed, seed_len)) {
280	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
281	goto err;
282	}
283	}
284	ret = 1;
285	err:
286	return ret;
287	}
288
289	int ossl_ec_group_todata(const EC_GROUP group, OSSL_PARAM_BLD tmpl,
290	OSSL_PARAM params[], OSSL_LIB_CTX *libctx,
291	const char *propq,
292	BN_CTX bnctx, unsigned char *genbuf)
293	{
294	int ret = 0, curve_nid, encoding_flag;
295	const char encoding_name, pt_form_name;
296	point_conversion_form_t genform;
297
298	if (group == NULL) {
299	ERR_raise(ERR_LIB_EC,EC_R_PASSED_NULL_PARAMETER);
300	return 0;
301	}
302
303	genform = EC_GROUP_get_point_conversion_form(group);
304	pt_form_name = ossl_ec_pt_format_id2name(genform);
305	if (pt_form_name == NULL
306	\|\| !ossl_param_build_set_utf8_string(
307	tmpl, params,
308	OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, pt_form_name)) {
309	ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM);
310	return 0;
311	}
312	encoding_flag = EC_GROUP_get_asn1_flag(group) & OPENSSL_EC_NAMED_CURVE;
313	encoding_name = ec_param_encoding_id2name(encoding_flag);
314	if (encoding_name == NULL
315	\|\| !ossl_param_build_set_utf8_string(tmpl, params,
316	OSSL_PKEY_PARAM_EC_ENCODING,
317	encoding_name)) {
318	ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
319	return 0;
320	}
321
322	if (!ossl_param_build_set_int(tmpl, params,
323	OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS,
324	group->decoded_from_explicit_params))
325	return 0;
326
327	curve_nid = EC_GROUP_get_curve_name(group);
328
329	/*
330	* Get the explicit parameters in these two cases:
331	* - We do not have a template, i.e. specific parameters are requested
332	* - The curve is not a named curve
333	*/
334	if (tmpl == NULL \|\| curve_nid == NID_undef)
335	if (!ec_group_explicit_todata(group, tmpl, params, bnctx, genbuf))
336	goto err;
337
338	if (curve_nid != NID_undef) {
339	/* Named curve */
340	const char *curve_name = OSSL_EC_curve_nid2name(curve_nid);
341
342	if (curve_name == NULL
343	\|\| !ossl_param_build_set_utf8_string(tmpl, params,
344	OSSL_PKEY_PARAM_GROUP_NAME,
345	curve_name)) {
346	ERR_raise(ERR_LIB_EC, EC_R_INVALID_CURVE);
347	goto err;
348	}
349	}
350	ret = 1;
351	err:
352	return ret;
353	}
354
355	/*
356	* The intention with the "backend" source file is to offer backend support
357	* for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
358	* implementations alike.
359	*/
360	int ossl_ec_set_ecdh_cofactor_mode(EC_KEY *ec, int mode)
361	{
362	const EC_GROUP *ecg = EC_KEY_get0_group(ec);
363	const BIGNUM *cofactor;
364	/*
365	* mode can be only 0 for disable, or 1 for enable here.
366	*
367	* This is in contrast with the same parameter on an ECDH EVP_PKEY_CTX that
368	* also supports mode == -1 with the meaning of "reset to the default for
369	* the associated key".
370	*/
371	if (mode < 0 \|\| mode > 1)
372	return 0;
373
374	if ((cofactor = EC_GROUP_get0_cofactor(ecg)) == NULL )
375	return 0;
376
377	/* ECDH cofactor mode has no effect if cofactor is 1 */
378	if (BN_is_one(cofactor))
379	return 1;
380
381	if (mode == 1)
382	EC_KEY_set_flags(ec, EC_FLAG_COFACTOR_ECDH);
383	else if (mode == 0)
384	EC_KEY_clear_flags(ec, EC_FLAG_COFACTOR_ECDH);
385
386	return 1;
387	}
388
389	/*
390	* Callers of ossl_ec_key_fromdata MUST make sure that ec_key_params_fromdata has
391	* been called before!
392	*
393	* This function only gets the bare keypair, domain parameters and other
394	* parameters are treated separately, and domain parameters are required to
395	* define a keypair.
396	*/
397	int ossl_ec_key_fromdata(EC_KEY *ec, const OSSL_PARAM params[], int include_private)
398	{
399	const OSSL_PARAM param_priv_key = NULL, param_pub_key = NULL;
400	BN_CTX *ctx = NULL;
401	BIGNUM *priv_key = NULL;
402	unsigned char *pub_key = NULL;
403	size_t pub_key_len;
404	const EC_GROUP *ecg = NULL;
405	EC_POINT *pub_point = NULL;
406	int ok = 0;
407
408	ecg = EC_KEY_get0_group(ec);
409	if (ecg == NULL)
410	return 0;
411
412	param_pub_key =
413	OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
414	if (include_private)
415	param_priv_key =
416	OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
417
418	ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(ec));
419	if (ctx == NULL)
420	goto err;
421
422	if (param_pub_key != NULL)
423	if (!OSSL_PARAM_get_octet_string(param_pub_key,
424	(void **)&pub_key, 0, &pub_key_len)
425	\|\| (pub_point = EC_POINT_new(ecg)) == NULL
426	\|\| !EC_POINT_oct2point(ecg, pub_point, pub_key, pub_key_len, ctx))
427	goto err;
428
429	if (param_priv_key != NULL && include_private) {
430	int fixed_words;
431	const BIGNUM *order;
432
433	/*
434	* Key import/export should never leak the bit length of the secret
435	* scalar in the key.
436	*
437	* For this reason, on export we use padded BIGNUMs with fixed length.
438	*
439	* When importing we also should make sure that, even if short lived,
440	* the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
441	* soon as possible, so that any processing of this BIGNUM might opt for
442	* constant time implementations in the backend.
443	*
444	* Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
445	* to preallocate the BIGNUM internal buffer to a fixed public size big
446	* enough that operations performed during the processing never trigger
447	* a realloc which would leak the size of the scalar through memory
448	* accesses.
449	*
450	* Fixed Length
451	* ------------
452	*
453	* The order of the large prime subgroup of the curve is our choice for
454	* a fixed public size, as that is generally the upper bound for
455	* generating a private key in EC cryptosystems and should fit all valid
456	* secret scalars.
457	*
458	* For padding on export we just use the bit length of the order
459	* converted to bytes (rounding up).
460	*
461	* For preallocating the BIGNUM storage we look at the number of "words"
462	* required for the internal representation of the order, and we
463	* preallocate 2 extra "words" in case any of the subsequent processing
464	* might temporarily overflow the order length.
465	*/
466	order = EC_GROUP_get0_order(ecg);
467	if (order == NULL \|\| BN_is_zero(order))
468	goto err;
469
470	fixed_words = bn_get_top(order) + 2;
471
472	if ((priv_key = BN_secure_new()) == NULL)
473	goto err;
474	if (bn_wexpand(priv_key, fixed_words) == NULL)
475	goto err;
476	BN_set_flags(priv_key, BN_FLG_CONSTTIME);
477
478	if (!OSSL_PARAM_get_BN(param_priv_key, &priv_key))
479	goto err;
480	}
481
482	if (priv_key != NULL
483	&& !EC_KEY_set_private_key(ec, priv_key))
484	goto err;
485
486	if (pub_point != NULL
487	&& !EC_KEY_set_public_key(ec, pub_point))
488	goto err;
489
490	ok = 1;
491
492	err:
493	BN_CTX_free(ctx);
494	BN_clear_free(priv_key);
495	OPENSSL_free(pub_key);
496	EC_POINT_free(pub_point);
497	return ok;
498	}
499
500	int ossl_ec_group_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
501	{
502	int ok = 0;
503	EC_GROUP *group = NULL;
504
505	if (ec == NULL)
506	return 0;
507
508	group = EC_GROUP_new_from_params(params, ossl_ec_key_get_libctx(ec),
509	ossl_ec_key_get0_propq(ec));
510
511	if (!EC_KEY_set_group(ec, group))
512	goto err;
513	ok = 1;
514	err:
515	EC_GROUP_free(group);
516	return ok;
517	}
518
519	static int ec_key_point_format_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
520	{
521	const OSSL_PARAM *p;
522	int format = -1;
523
524	p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT);
525	if (p != NULL) {
526	if (!ossl_ec_pt_format_param2id(p, &format)) {
527	ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM);
528	return 0;
529	}
530	EC_KEY_set_conv_form(ec, format);
531	}
532	return 1;
533	}
534
535	static int ec_key_group_check_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
536	{
537	const OSSL_PARAM *p;
538
539	p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE);
540	if (p != NULL)
541	return ec_set_check_group_type_from_param(ec, p);
542	return 1;
543	}
544
545	static int ec_set_include_public(EC_KEY *ec, int include)
546	{
547	int flags = EC_KEY_get_enc_flags(ec);
548
549	if (!include)
550	flags \|= EC_PKEY_NO_PUBKEY;
551	else
552	flags &= ~EC_PKEY_NO_PUBKEY;
553	EC_KEY_set_enc_flags(ec, flags);
554	return 1;
555	}
556
557	int ossl_ec_key_otherparams_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
558	{
559	const OSSL_PARAM *p;
560
561	if (ec == NULL)
562	return 0;
563
564	p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
565	if (p != NULL) {
566	int mode;
567
568	if (!OSSL_PARAM_get_int(p, &mode)
569	\|\| !ossl_ec_set_ecdh_cofactor_mode(ec, mode))
570	return 0;
571	}
572
573	p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC);
574	if (p != NULL) {
575	int include = 1;
576
577	if (!OSSL_PARAM_get_int(p, &include)
578	\|\| !ec_set_include_public(ec, include))
579	return 0;
580	}
581	if (!ec_key_point_format_fromdata(ec, params))
582	return 0;
583	if (!ec_key_group_check_fromdata(ec, params))
584	return 0;
585	return 1;
586	}
587
588	int ossl_ec_key_is_foreign(const EC_KEY *ec)
589	{
590	#ifndef FIPS_MODULE
591	if (ec->engine != NULL \|\| EC_KEY_get_method(ec) != EC_KEY_OpenSSL())
592	return 1;
593	#endif
594	return 0;
595
596	}
597
598	EC_KEY ossl_ec_key_dup(const EC_KEY src, int selection)
599	{
600	EC_KEY *ret;
601
602	if (src == NULL) {
603	ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
604	return NULL;
605	}
606
607	if ((ret = ossl_ec_key_new_method_int(src->libctx, src->propq,
608	src->engine)) == NULL)
609	return NULL;
610
611	/* copy the parameters */
612	if (src->group != NULL
613	&& (selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
614	ret->group = ossl_ec_group_new_ex(src->libctx, src->propq,
615	src->group->meth);
616	if (ret->group == NULL
617	\|\| !EC_GROUP_copy(ret->group, src->group))
618	goto err;
619
620	if (src->meth != NULL) {
621	#if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODULE)
622	if (src->engine != NULL && ENGINE_init(src->engine) == 0)
623	goto err;
624	ret->engine = src->engine;
625	#endif
626	ret->meth = src->meth;
627	}
628	}
629
630	/* copy the public key */
631	if (src->pub_key != NULL
632	&& (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
633	if (ret->group == NULL)
634	/* no parameter-less keys allowed */
635	goto err;
636	ret->pub_key = EC_POINT_new(ret->group);
637	if (ret->pub_key == NULL
638	\|\| !EC_POINT_copy(ret->pub_key, src->pub_key))
639	goto err;
640	}
641
642	/* copy the private key */
643	if (src->priv_key != NULL
644	&& (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
645	if (ret->group == NULL)
646	/* no parameter-less keys allowed */
647	goto err;
648	ret->priv_key = BN_new();
649	if (ret->priv_key == NULL \|\| !BN_copy(ret->priv_key, src->priv_key))
650	goto err;
651	if (ret->group->meth->keycopy
652	&& ret->group->meth->keycopy(ret, src) == 0)
653	goto err;
654	}
655
656	/* copy the rest */
657	if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0) {
658	ret->enc_flag = src->enc_flag;
659	ret->conv_form = src->conv_form;
660	}
661
662	ret->version = src->version;
663	ret->flags = src->flags;
664
665	#ifndef FIPS_MODULE
666	if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY,
667	&ret->ex_data, &src->ex_data))
668	goto err;
669	#endif
670
671	if (ret->meth != NULL && ret->meth->copy != NULL) {
672	if ((selection
673	& OSSL_KEYMGMT_SELECT_KEYPAIR) != OSSL_KEYMGMT_SELECT_KEYPAIR)
674	goto err;
675	if (ret->meth->copy(ret, src) == 0)
676	goto err;
677	}
678
679	return ret;
680	err:
681	EC_KEY_free(ret);
682	return NULL;
683	}
684
685	int ossl_ec_encoding_param2id(const OSSL_PARAM p, int id)
686	{
687	const char *name = NULL;
688	int status = 0;
689
690	switch (p->data_type) {
691	case OSSL_PARAM_UTF8_STRING:
692	/* The OSSL_PARAM functions have no support for this */
693	name = p->data;
694	status = (name != NULL);
695	break;
696	case OSSL_PARAM_UTF8_PTR:
697	status = OSSL_PARAM_get_utf8_ptr(p, &name);
698	break;
699	}
700	if (status) {
701	int i = ossl_ec_encoding_name2id(name);
702
703	if (i >= 0) {
704	*id = i;
705	return 1;
706	}
707	}
708	return 0;
709	}
710
711	int ossl_ec_pt_format_param2id(const OSSL_PARAM p, int id)
712	{
713	const char *name = NULL;
714	int status = 0;
715
716	switch (p->data_type) {
717	case OSSL_PARAM_UTF8_STRING:
718	/* The OSSL_PARAM functions have no support for this */
719	name = p->data;
720	status = (name != NULL);
721	break;
722	case OSSL_PARAM_UTF8_PTR:
723	status = OSSL_PARAM_get_utf8_ptr(p, &name);
724	break;
725	}
726	if (status) {
727	int i = ossl_ec_pt_format_name2id(name);
728
729	if (i >= 0) {
730	*id = i;
731	return 1;
732	}
733	}
734	return 0;
735	}
736
737	#ifndef FIPS_MODULE
738	int ossl_x509_algor_is_sm2(const X509_ALGOR *palg)
739	{
740	int ptype = 0;
741	const void *pval = NULL;
742
743	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
744
745	if (ptype == V_ASN1_OBJECT)
746	return OBJ_obj2nid((ASN1_OBJECT *)pval) == NID_sm2;
747
748	if (ptype == V_ASN1_SEQUENCE) {
749	const ASN1_STRING *str = pval;
750	const unsigned char *der = str->data;
751	int derlen = str->length;
752	EC_GROUP *group;
753	int ret;
754
755	if ((group = d2i_ECPKParameters(NULL, &der, derlen)) == NULL)
756	ret = 0;
757	else
758	ret = (EC_GROUP_get_curve_name(group) == NID_sm2);
759
760	EC_GROUP_free(group);
761	return ret;
762	}
763
764	return 0;
765	}
766
767	EC_KEY ossl_ec_key_param_from_x509_algor(const X509_ALGOR palg,
768	OSSL_LIB_CTX libctx, const char propq)
769	{
770	int ptype = 0;
771	const void *pval = NULL;
772	EC_KEY *eckey = NULL;
773	EC_GROUP *group = NULL;
774
775	X509_ALGOR_get0(NULL, &ptype, &pval, palg);
776	if ((eckey = EC_KEY_new_ex(libctx, propq)) == NULL) {
777	ERR_raise(ERR_LIB_EC, ERR_R_MALLOC_FAILURE);
778	goto ecerr;
779	}
780
781	if (ptype == V_ASN1_SEQUENCE) {
782	const ASN1_STRING *pstr = pval;
783	const unsigned char *pm = pstr->data;
784	int pmlen = pstr->length;
785
786
787	if (d2i_ECParameters(&eckey, &pm, pmlen) == NULL) {
788	ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
789	goto ecerr;
790	}
791	} else if (ptype == V_ASN1_OBJECT) {
792	const ASN1_OBJECT *poid = pval;
793
794	/*
795	* type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
796	*/
797
798	group = EC_GROUP_new_by_curve_name_ex(libctx, propq, OBJ_obj2nid(poid));
799	if (group == NULL)
800	goto ecerr;
801	EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
802	if (EC_KEY_set_group(eckey, group) == 0)
803	goto ecerr;
804	EC_GROUP_free(group);
805	} else {
806	ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
807	goto ecerr;
808	}
809
810	return eckey;
811
812	ecerr:
813	EC_KEY_free(eckey);
814	EC_GROUP_free(group);
815	return NULL;
816	}
817
818	EC_KEY ossl_ec_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO p8inf,
819	OSSL_LIB_CTX libctx, const char propq)
820	{
821	const unsigned char *p = NULL;
822	int pklen;
823	EC_KEY *eckey = NULL;
824	const X509_ALGOR *palg;
825
826	if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8inf))
827	return 0;
828	eckey = ossl_ec_key_param_from_x509_algor(palg, libctx, propq);
829	if (eckey == NULL)
830	goto err;
831
832	/* We have parameters now set private key */
833	if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
834	ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
835	goto err;
836	}
837
838	return eckey;
839	err:
840	EC_KEY_free(eckey);
841	return NULL;
842	}
843	#endif

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source: vbox/trunk/src/libs/openssl-3.1.3/crypto/ec/ec_backend.c@ 102427

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