1 /*
2 * Copyright 2020-2024 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
ossl_ec_encoding_name2id(const char * name)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
ec_param_encoding_id2name(int id)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
ossl_ec_check_group_type_id2name(int id)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
ec_check_group_type_name2id(const char * name)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
ossl_ec_set_check_group_type_from_name(EC_KEY * ec,const char * name)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
ec_set_check_group_type_from_param(EC_KEY * ec,const OSSL_PARAM * p)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
ossl_ec_pt_format_name2id(const char * name)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
ossl_ec_pt_format_id2name(int id)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
ec_group_explicit_todata(const EC_GROUP * group,OSSL_PARAM_BLD * tmpl,OSSL_PARAM params[],BN_CTX * bnctx,unsigned char ** genbuf)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 BIGNUM *p = BN_CTX_get(bnctx);
189 BIGNUM *a = BN_CTX_get(bnctx);
190 BIGNUM *b = BN_CTX_get(bnctx);
191
192 if (b == NULL) {
193 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
194 goto err;
195 }
196
197 if (!EC_GROUP_get_curve(group, p, a, b, bnctx)) {
198 ERR_raise(ERR_LIB_EC, EC_R_INVALID_CURVE);
199 goto err;
200 }
201 if (!ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_P, p)
202 || !ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_A, a)
203 || !ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_B, b)) {
204 ERR_raise(ERR_LIB_EC, ERR_R_CRYPTO_LIB);
205 goto err;
206 }
207 }
208
209 param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ORDER);
210 if (tmpl != NULL || param != NULL) {
211 const BIGNUM *order = EC_GROUP_get0_order(group);
212
213 if (order == NULL) {
214 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
215 goto err;
216 }
217 if (!ossl_param_build_set_bn(tmpl, params, OSSL_PKEY_PARAM_EC_ORDER,
218 order)) {
219 ERR_raise(ERR_LIB_EC, ERR_R_CRYPTO_LIB);
220 goto err;
221 }
222 }
223
224 param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE);
225 if (tmpl != NULL || param != NULL) {
226 if (!ossl_param_build_set_utf8_string(tmpl, params,
227 OSSL_PKEY_PARAM_EC_FIELD_TYPE,
228 field_type)) {
229 ERR_raise(ERR_LIB_EC, ERR_R_CRYPTO_LIB);
230 goto err;
231 }
232 }
233
234 param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GENERATOR);
235 if (tmpl != NULL || param != NULL) {
236 size_t genbuf_len;
237 const EC_POINT *genpt = EC_GROUP_get0_generator(group);
238 point_conversion_form_t genform = EC_GROUP_get_point_conversion_form(group);
239
240 if (genpt == NULL) {
241 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
242 goto err;
243 }
244 genbuf_len = EC_POINT_point2buf(group, genpt, genform, genbuf, bnctx);
245 if (genbuf_len == 0) {
246 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR);
247 goto err;
248 }
249 if (!ossl_param_build_set_octet_string(tmpl, params,
250 OSSL_PKEY_PARAM_EC_GENERATOR,
251 *genbuf, genbuf_len)) {
252 ERR_raise(ERR_LIB_EC, ERR_R_CRYPTO_LIB);
253 goto err;
254 }
255 }
256
257 param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_COFACTOR);
258 if (tmpl != NULL || param != NULL) {
259 const BIGNUM *cofactor = EC_GROUP_get0_cofactor(group);
260
261 if (cofactor != NULL
262 && !ossl_param_build_set_bn(tmpl, params,
263 OSSL_PKEY_PARAM_EC_COFACTOR, cofactor)) {
264 ERR_raise(ERR_LIB_EC, ERR_R_CRYPTO_LIB);
265 goto err;
266 }
267 }
268
269 param = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED);
270 if (tmpl != NULL || param != NULL) {
271 unsigned char *seed = EC_GROUP_get0_seed(group);
272 size_t seed_len = EC_GROUP_get_seed_len(group);
273
274 if (seed != NULL
275 && seed_len > 0
276 && !ossl_param_build_set_octet_string(tmpl, params,
277 OSSL_PKEY_PARAM_EC_SEED,
278 seed, seed_len)) {
279 ERR_raise(ERR_LIB_EC, ERR_R_CRYPTO_LIB);
280 goto err;
281 }
282 }
283 ret = 1;
284 err:
285 return ret;
286 }
287
ossl_ec_group_todata(const EC_GROUP * group,OSSL_PARAM_BLD * tmpl,OSSL_PARAM params[],OSSL_LIB_CTX * libctx,const char * propq,BN_CTX * bnctx,unsigned char ** genbuf)288 int ossl_ec_group_todata(const EC_GROUP *group, OSSL_PARAM_BLD *tmpl,
289 OSSL_PARAM params[], OSSL_LIB_CTX *libctx,
290 const char *propq,
291 BN_CTX *bnctx, unsigned char **genbuf)
292 {
293 int ret = 0, curve_nid, encoding_flag;
294 const char *encoding_name, *pt_form_name;
295 point_conversion_form_t genform;
296
297 if (group == NULL) {
298 ERR_raise(ERR_LIB_EC, EC_R_PASSED_NULL_PARAMETER);
299 return 0;
300 }
301
302 genform = EC_GROUP_get_point_conversion_form(group);
303 pt_form_name = ossl_ec_pt_format_id2name(genform);
304 if (pt_form_name == NULL
305 || !ossl_param_build_set_utf8_string(
306 tmpl, params,
307 OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT, pt_form_name)) {
308 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM);
309 return 0;
310 }
311 encoding_flag = EC_GROUP_get_asn1_flag(group) & OPENSSL_EC_NAMED_CURVE;
312 encoding_name = ec_param_encoding_id2name(encoding_flag);
313 if (encoding_name == NULL
314 || !ossl_param_build_set_utf8_string(tmpl, params,
315 OSSL_PKEY_PARAM_EC_ENCODING,
316 encoding_name)) {
317 ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING);
318 return 0;
319 }
320
321 if (!ossl_param_build_set_int(tmpl, params,
322 OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS,
323 group->decoded_from_explicit_params))
324 return 0;
325
326 curve_nid = EC_GROUP_get_curve_name(group);
327
328 /*
329 * Get the explicit parameters in these two cases:
330 * - We do not have a template, i.e. specific parameters are requested
331 * - The curve is not a named curve
332 */
333 if (tmpl == NULL || curve_nid == NID_undef)
334 if (!ec_group_explicit_todata(group, tmpl, params, bnctx, genbuf))
335 goto err;
336
337 if (curve_nid != NID_undef) {
338 /* Named curve */
339 const char *curve_name = OSSL_EC_curve_nid2name(curve_nid);
340
341 if (curve_name == NULL
342 || !ossl_param_build_set_utf8_string(tmpl, params,
343 OSSL_PKEY_PARAM_GROUP_NAME,
344 curve_name)) {
345 ERR_raise(ERR_LIB_EC, EC_R_INVALID_CURVE);
346 goto err;
347 }
348 }
349 ret = 1;
350 err:
351 return ret;
352 }
353
354 /*
355 * The intention with the "backend" source file is to offer backend support
356 * for legacy backends (EVP_PKEY_ASN1_METHOD and EVP_PKEY_METHOD) and provider
357 * implementations alike.
358 */
ossl_ec_set_ecdh_cofactor_mode(EC_KEY * ec,int mode)359 int ossl_ec_set_ecdh_cofactor_mode(EC_KEY *ec, int mode)
360 {
361 const EC_GROUP *ecg = EC_KEY_get0_group(ec);
362 const BIGNUM *cofactor;
363 /*
364 * mode can be only 0 for disable, or 1 for enable here.
365 *
366 * This is in contrast with the same parameter on an ECDH EVP_PKEY_CTX that
367 * also supports mode == -1 with the meaning of "reset to the default for
368 * the associated key".
369 */
370 if (mode < 0 || mode > 1)
371 return 0;
372
373 if ((cofactor = EC_GROUP_get0_cofactor(ecg)) == NULL )
374 return 0;
375
376 /* ECDH cofactor mode has no effect if cofactor is 1 */
377 if (BN_is_one(cofactor))
378 return 1;
379
380 if (mode == 1)
381 EC_KEY_set_flags(ec, EC_FLAG_COFACTOR_ECDH);
382 else if (mode == 0)
383 EC_KEY_clear_flags(ec, EC_FLAG_COFACTOR_ECDH);
384
385 return 1;
386 }
387
388 /*
389 * Callers of ossl_ec_key_fromdata MUST make sure that ec_key_params_fromdata has
390 * been called before!
391 *
392 * This function only gets the bare keypair, domain parameters and other
393 * parameters are treated separately, and domain parameters are required to
394 * define a keypair.
395 */
ossl_ec_key_fromdata(EC_KEY * ec,const OSSL_PARAM params[],int include_private)396 int ossl_ec_key_fromdata(EC_KEY *ec, const OSSL_PARAM params[], int include_private)
397 {
398 const OSSL_PARAM *param_priv_key = NULL, *param_pub_key = NULL;
399 BN_CTX *ctx = NULL;
400 BIGNUM *priv_key = NULL;
401 unsigned char *pub_key = NULL;
402 size_t pub_key_len;
403 const EC_GROUP *ecg = NULL;
404 EC_POINT *pub_point = NULL;
405 int ok = 0;
406
407 ecg = EC_KEY_get0_group(ec);
408 if (ecg == NULL)
409 return 0;
410
411 param_pub_key =
412 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
413 if (include_private)
414 param_priv_key =
415 OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
416
417 ctx = BN_CTX_new_ex(ossl_ec_key_get_libctx(ec));
418 if (ctx == NULL)
419 goto err;
420
421 if (param_pub_key != NULL)
422 if (!OSSL_PARAM_get_octet_string(param_pub_key,
423 (void **)&pub_key, 0, &pub_key_len)
424 || (pub_point = EC_POINT_new(ecg)) == NULL
425 || !EC_POINT_oct2point(ecg, pub_point, pub_key, pub_key_len, ctx))
426 goto err;
427
428 if (param_priv_key != NULL && include_private) {
429 int fixed_words;
430 const BIGNUM *order;
431
432 /*
433 * Key import/export should never leak the bit length of the secret
434 * scalar in the key.
435 *
436 * For this reason, on export we use padded BIGNUMs with fixed length.
437 *
438 * When importing we also should make sure that, even if short lived,
439 * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
440 * soon as possible, so that any processing of this BIGNUM might opt for
441 * constant time implementations in the backend.
442 *
443 * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
444 * to preallocate the BIGNUM internal buffer to a fixed public size big
445 * enough that operations performed during the processing never trigger
446 * a realloc which would leak the size of the scalar through memory
447 * accesses.
448 *
449 * Fixed Length
450 * ------------
451 *
452 * The order of the large prime subgroup of the curve is our choice for
453 * a fixed public size, as that is generally the upper bound for
454 * generating a private key in EC cryptosystems and should fit all valid
455 * secret scalars.
456 *
457 * For padding on export we just use the bit length of the order
458 * converted to bytes (rounding up).
459 *
460 * For preallocating the BIGNUM storage we look at the number of "words"
461 * required for the internal representation of the order, and we
462 * preallocate 2 extra "words" in case any of the subsequent processing
463 * might temporarily overflow the order length.
464 */
465 order = EC_GROUP_get0_order(ecg);
466 if (order == NULL || BN_is_zero(order))
467 goto err;
468
469 fixed_words = bn_get_top(order) + 2;
470
471 if ((priv_key = BN_secure_new()) == NULL)
472 goto err;
473 if (bn_wexpand(priv_key, fixed_words) == NULL)
474 goto err;
475 BN_set_flags(priv_key, BN_FLG_CONSTTIME);
476
477 if (!OSSL_PARAM_get_BN(param_priv_key, &priv_key))
478 goto err;
479 }
480
481 if (priv_key != NULL
482 && !EC_KEY_set_private_key(ec, priv_key))
483 goto err;
484
485 if (pub_point != NULL
486 && !EC_KEY_set_public_key(ec, pub_point))
487 goto err;
488
489 ok = 1;
490
491 err:
492 BN_CTX_free(ctx);
493 BN_clear_free(priv_key);
494 OPENSSL_free(pub_key);
495 EC_POINT_free(pub_point);
496 return ok;
497 }
498
ossl_ec_group_fromdata(EC_KEY * ec,const OSSL_PARAM params[])499 int ossl_ec_group_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
500 {
501 int ok = 0;
502 EC_GROUP *group = NULL;
503
504 if (ec == NULL)
505 return 0;
506
507 group = EC_GROUP_new_from_params(params, ossl_ec_key_get_libctx(ec),
508 ossl_ec_key_get0_propq(ec));
509
510 if (!EC_KEY_set_group(ec, group))
511 goto err;
512 ok = 1;
513 err:
514 EC_GROUP_free(group);
515 return ok;
516 }
517
ec_key_point_format_fromdata(EC_KEY * ec,const OSSL_PARAM params[])518 static int ec_key_point_format_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
519 {
520 const OSSL_PARAM *p;
521 int format = -1;
522
523 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT);
524 if (p != NULL) {
525 if (!ossl_ec_pt_format_param2id(p, &format)) {
526 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM);
527 return 0;
528 }
529 EC_KEY_set_conv_form(ec, format);
530 }
531 return 1;
532 }
533
ec_key_group_check_fromdata(EC_KEY * ec,const OSSL_PARAM params[])534 static int ec_key_group_check_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
535 {
536 const OSSL_PARAM *p;
537
538 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GROUP_CHECK_TYPE);
539 if (p != NULL)
540 return ec_set_check_group_type_from_param(ec, p);
541 return 1;
542 }
543
ec_set_include_public(EC_KEY * ec,int include)544 static int ec_set_include_public(EC_KEY *ec, int include)
545 {
546 int flags = EC_KEY_get_enc_flags(ec);
547
548 if (!include)
549 flags |= EC_PKEY_NO_PUBKEY;
550 else
551 flags &= ~EC_PKEY_NO_PUBKEY;
552 EC_KEY_set_enc_flags(ec, flags);
553 return 1;
554 }
555
ossl_ec_key_otherparams_fromdata(EC_KEY * ec,const OSSL_PARAM params[])556 int ossl_ec_key_otherparams_fromdata(EC_KEY *ec, const OSSL_PARAM params[])
557 {
558 const OSSL_PARAM *p;
559
560 if (ec == NULL)
561 return 0;
562
563 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_USE_COFACTOR_ECDH);
564 if (p != NULL) {
565 int mode;
566
567 if (!OSSL_PARAM_get_int(p, &mode)
568 || !ossl_ec_set_ecdh_cofactor_mode(ec, mode))
569 return 0;
570 }
571
572 p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_INCLUDE_PUBLIC);
573 if (p != NULL) {
574 int include = 1;
575
576 if (!OSSL_PARAM_get_int(p, &include)
577 || !ec_set_include_public(ec, include))
578 return 0;
579 }
580 if (!ec_key_point_format_fromdata(ec, params))
581 return 0;
582 if (!ec_key_group_check_fromdata(ec, params))
583 return 0;
584 return 1;
585 }
586
ossl_ec_key_is_foreign(const EC_KEY * ec)587 int ossl_ec_key_is_foreign(const EC_KEY *ec)
588 {
589 #ifndef FIPS_MODULE
590 if (ec->engine != NULL || EC_KEY_get_method(ec) != EC_KEY_OpenSSL())
591 return 1;
592 #endif
593 return 0;
594
595 }
596
ossl_ec_key_dup(const EC_KEY * src,int selection)597 EC_KEY *ossl_ec_key_dup(const EC_KEY *src, int selection)
598 {
599 EC_KEY *ret;
600
601 if (src == NULL) {
602 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
603 return NULL;
604 }
605
606 if ((ret = ossl_ec_key_new_method_int(src->libctx, src->propq,
607 src->engine)) == NULL)
608 return NULL;
609
610 /* copy the parameters */
611 if (src->group != NULL
612 && (selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0) {
613 ret->group = ossl_ec_group_new_ex(src->libctx, src->propq,
614 src->group->meth);
615 if (ret->group == NULL
616 || !EC_GROUP_copy(ret->group, src->group))
617 goto err;
618
619 if (src->meth != NULL)
620 ret->meth = src->meth;
621 }
622
623 /* copy the public key */
624 if (src->pub_key != NULL
625 && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
626 if (ret->group == NULL)
627 /* no parameter-less keys allowed */
628 goto err;
629 ret->pub_key = EC_POINT_new(ret->group);
630 if (ret->pub_key == NULL
631 || !EC_POINT_copy(ret->pub_key, src->pub_key))
632 goto err;
633 }
634
635 /* copy the private key */
636 if (src->priv_key != NULL
637 && (selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
638 if (ret->group == NULL)
639 /* no parameter-less keys allowed */
640 goto err;
641 ret->priv_key = BN_new();
642 if (ret->priv_key == NULL || !BN_copy(ret->priv_key, src->priv_key))
643 goto err;
644 if (ret->group->meth->keycopy
645 && ret->group->meth->keycopy(ret, src) == 0)
646 goto err;
647 }
648
649 /* copy the rest */
650 if ((selection & OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS) != 0) {
651 ret->enc_flag = src->enc_flag;
652 ret->conv_form = src->conv_form;
653 }
654
655 ret->version = src->version;
656 ret->flags = src->flags;
657
658 #ifndef FIPS_MODULE
659 if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY,
660 &ret->ex_data, &src->ex_data))
661 goto err;
662 #endif
663
664 if (ret->meth != NULL && ret->meth->copy != NULL) {
665 if ((selection
666 & OSSL_KEYMGMT_SELECT_KEYPAIR) != OSSL_KEYMGMT_SELECT_KEYPAIR)
667 goto err;
668 if (ret->meth->copy(ret, src) == 0)
669 goto err;
670 }
671
672 return ret;
673 err:
674 EC_KEY_free(ret);
675 return NULL;
676 }
677
ossl_ec_encoding_param2id(const OSSL_PARAM * p,int * id)678 int ossl_ec_encoding_param2id(const OSSL_PARAM *p, int *id)
679 {
680 const char *name = NULL;
681 int status = 0;
682
683 switch (p->data_type) {
684 case OSSL_PARAM_UTF8_STRING:
685 /* The OSSL_PARAM functions have no support for this */
686 name = p->data;
687 status = (name != NULL);
688 break;
689 case OSSL_PARAM_UTF8_PTR:
690 status = OSSL_PARAM_get_utf8_ptr(p, &name);
691 break;
692 }
693 if (status) {
694 int i = ossl_ec_encoding_name2id(name);
695
696 if (i >= 0) {
697 *id = i;
698 return 1;
699 }
700 }
701 return 0;
702 }
703
ossl_ec_pt_format_param2id(const OSSL_PARAM * p,int * id)704 int ossl_ec_pt_format_param2id(const OSSL_PARAM *p, int *id)
705 {
706 const char *name = NULL;
707 int status = 0;
708
709 switch (p->data_type) {
710 case OSSL_PARAM_UTF8_STRING:
711 /* The OSSL_PARAM functions have no support for this */
712 name = p->data;
713 status = (name != NULL);
714 break;
715 case OSSL_PARAM_UTF8_PTR:
716 status = OSSL_PARAM_get_utf8_ptr(p, &name);
717 break;
718 }
719 if (status) {
720 int i = ossl_ec_pt_format_name2id(name);
721
722 if (i >= 0) {
723 *id = i;
724 return 1;
725 }
726 }
727 return 0;
728 }
729
730 #ifndef FIPS_MODULE
ossl_x509_algor_is_sm2(const X509_ALGOR * palg)731 int ossl_x509_algor_is_sm2(const X509_ALGOR *palg)
732 {
733 int ptype = 0;
734 const void *pval = NULL;
735
736 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
737
738 if (ptype == V_ASN1_OBJECT)
739 return OBJ_obj2nid((ASN1_OBJECT *)pval) == NID_sm2;
740
741 if (ptype == V_ASN1_SEQUENCE) {
742 const ASN1_STRING *str = pval;
743 const unsigned char *der = str->data;
744 int derlen = str->length;
745 EC_GROUP *group;
746 int ret;
747
748 if ((group = d2i_ECPKParameters(NULL, &der, derlen)) == NULL)
749 ret = 0;
750 else
751 ret = (EC_GROUP_get_curve_name(group) == NID_sm2);
752
753 EC_GROUP_free(group);
754 return ret;
755 }
756
757 return 0;
758 }
759
ossl_ec_key_param_from_x509_algor(const X509_ALGOR * palg,OSSL_LIB_CTX * libctx,const char * propq)760 EC_KEY *ossl_ec_key_param_from_x509_algor(const X509_ALGOR *palg,
761 OSSL_LIB_CTX *libctx, const char *propq)
762 {
763 int ptype = 0;
764 const void *pval = NULL;
765 EC_KEY *eckey = NULL;
766 EC_GROUP *group = NULL;
767
768 X509_ALGOR_get0(NULL, &ptype, &pval, palg);
769 if ((eckey = EC_KEY_new_ex(libctx, propq)) == NULL) {
770 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
771 goto ecerr;
772 }
773
774 if (ptype == V_ASN1_SEQUENCE) {
775 const ASN1_STRING *pstr = pval;
776 const unsigned char *pm = pstr->data;
777 int pmlen = pstr->length;
778
779
780 if (d2i_ECParameters(&eckey, &pm, pmlen) == NULL) {
781 ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
782 goto ecerr;
783 }
784 } else if (ptype == V_ASN1_OBJECT) {
785 const ASN1_OBJECT *poid = pval;
786
787 /*
788 * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
789 */
790
791 group = EC_GROUP_new_by_curve_name_ex(libctx, propq, OBJ_obj2nid(poid));
792 if (group == NULL)
793 goto ecerr;
794 EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
795 if (EC_KEY_set_group(eckey, group) == 0)
796 goto ecerr;
797 EC_GROUP_free(group);
798 } else {
799 ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
800 goto ecerr;
801 }
802
803 return eckey;
804
805 ecerr:
806 EC_KEY_free(eckey);
807 EC_GROUP_free(group);
808 return NULL;
809 }
810
ossl_ec_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO * p8inf,OSSL_LIB_CTX * libctx,const char * propq)811 EC_KEY *ossl_ec_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
812 OSSL_LIB_CTX *libctx, const char *propq)
813 {
814 const unsigned char *p = NULL;
815 int pklen;
816 EC_KEY *eckey = NULL;
817 const X509_ALGOR *palg;
818
819 if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8inf))
820 return 0;
821 eckey = ossl_ec_key_param_from_x509_algor(palg, libctx, propq);
822 if (eckey == NULL)
823 goto err;
824
825 /* We have parameters now set private key */
826 if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
827 ERR_raise(ERR_LIB_EC, EC_R_DECODE_ERROR);
828 goto err;
829 }
830
831 return eckey;
832 err:
833 EC_KEY_free(eckey);
834 return NULL;
835 }
836 #endif
837
