1 /*
2 * Copyright 2002-2026 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 * ECDSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14 #include "internal/deprecated.h"
15
16 #include <string.h>
17 #include "ec_local.h"
18 #include <openssl/err.h>
19 #include <openssl/asn1t.h>
20 #include <openssl/objects.h>
21 #include "internal/nelem.h"
22 #include "crypto/asn1.h"
23 #include "crypto/asn1_dsa.h"
24
25 #ifndef FIPS_MODULE
26
27 /* some structures needed for the asn1 encoding */
28 typedef struct x9_62_pentanomial_st {
29 int32_t k1;
30 int32_t k2;
31 int32_t k3;
32 } X9_62_PENTANOMIAL;
33
34 typedef struct x9_62_characteristic_two_st {
35 int32_t m;
36 ASN1_OBJECT *type;
37 union {
38 char *ptr;
39 /* NID_X9_62_onBasis */
40 ASN1_NULL *onBasis;
41 /* NID_X9_62_tpBasis */
42 ASN1_INTEGER *tpBasis;
43 /* NID_X9_62_ppBasis */
44 X9_62_PENTANOMIAL *ppBasis;
45 /* anything else */
46 ASN1_TYPE *other;
47 } p;
48 } X9_62_CHARACTERISTIC_TWO;
49
50 typedef struct x9_62_fieldid_st {
51 ASN1_OBJECT *fieldType;
52 union {
53 char *ptr;
54 /* NID_X9_62_prime_field */
55 ASN1_INTEGER *prime;
56 /* NID_X9_62_characteristic_two_field */
57 X9_62_CHARACTERISTIC_TWO *char_two;
58 /* anything else */
59 ASN1_TYPE *other;
60 } p;
61 } X9_62_FIELDID;
62
63 typedef struct x9_62_curve_st {
64 ASN1_OCTET_STRING *a;
65 ASN1_OCTET_STRING *b;
66 ASN1_BIT_STRING *seed;
67 } X9_62_CURVE;
68
69 struct ec_parameters_st {
70 int32_t version;
71 X9_62_FIELDID *fieldID;
72 X9_62_CURVE *curve;
73 ASN1_OCTET_STRING *base;
74 ASN1_INTEGER *order;
75 ASN1_INTEGER *cofactor;
76 } /* ECPARAMETERS */;
77
78 typedef enum {
79 ECPKPARAMETERS_TYPE_NAMED = 0,
80 ECPKPARAMETERS_TYPE_EXPLICIT,
81 ECPKPARAMETERS_TYPE_IMPLICIT
82 } ecpk_parameters_type_t;
83
84 struct ecpk_parameters_st {
85 int type;
86 union {
87 ASN1_OBJECT *named_curve;
88 ECPARAMETERS *parameters;
89 ASN1_NULL *implicitlyCA;
90 } value;
91 } /* ECPKPARAMETERS */;
92
93 /* SEC1 ECPrivateKey */
94 typedef struct ec_privatekey_st {
95 int32_t version;
96 ASN1_OCTET_STRING *privateKey;
97 ECPKPARAMETERS *parameters;
98 ASN1_BIT_STRING *publicKey;
99 } EC_PRIVATEKEY;
100
101 /* the OpenSSL ASN.1 definitions */
102 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
103 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
104 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
105 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
106 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
107
108 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
109 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
110
111 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
112
113 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
114 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
115 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
116 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
117 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
118
119 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
120 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
121 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
122 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
123 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
124
125 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
126 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
127
128 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
129
130 ASN1_ADB(X9_62_FIELDID) = {
131 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
132 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
133 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
134
135 ASN1_SEQUENCE(X9_62_FIELDID) = {
136 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
137 ASN1_ADB_OBJECT(X9_62_FIELDID)
138 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
139
140 ASN1_SEQUENCE(X9_62_CURVE)
141 = { ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING), ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING), ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING) } static_ASN1_SEQUENCE_END(X9_62_CURVE)
142
143 ASN1_SEQUENCE(ECPARAMETERS)
144 = { ASN1_EMBED(ECPARAMETERS, version, INT32), ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID), ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE), ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING), ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER), ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER) } ASN1_SEQUENCE_END(ECPARAMETERS)
145
146 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
147 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
148
149 ASN1_CHOICE(ECPKPARAMETERS) = {
150 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
151 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
152 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
153 } ASN1_CHOICE_END(ECPKPARAMETERS)
154
155 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
156 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
157 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
158
159 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
160 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
161 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
162 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
163 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
164 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
165
166 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
167 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
168 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
169
170 /* some declarations of internal function */
171
172 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
173 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
174 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
175 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
176
177 /* the function definitions */
178
ec_asn1_group2fieldid(const EC_GROUP * group,X9_62_FIELDID * field)179 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
180 {
181 int ok = 0, nid;
182 BIGNUM *tmp = NULL;
183
184 if (group == NULL || field == NULL)
185 return 0;
186
187 /* clear the old values (if necessary) */
188 ASN1_OBJECT_free(field->fieldType);
189 ASN1_TYPE_free(field->p.other);
190
191 nid = EC_GROUP_get_field_type(group);
192 /* set OID for the field */
193 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
194 ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
195 goto err;
196 }
197
198 if (nid == NID_X9_62_prime_field) {
199 if ((tmp = BN_new()) == NULL) {
200 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
201 goto err;
202 }
203 /* the parameters are specified by the prime number p */
204 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
205 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
206 goto err;
207 }
208 /* set the prime number */
209 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
210 if (field->p.prime == NULL) {
211 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
212 goto err;
213 }
214 } else if (nid == NID_X9_62_characteristic_two_field)
215 #ifdef OPENSSL_NO_EC2M
216 {
217 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
218 goto err;
219 }
220 #else
221 {
222 int field_type;
223 X9_62_CHARACTERISTIC_TWO *char_two;
224
225 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
226 char_two = field->p.char_two;
227
228 if (char_two == NULL) {
229 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
230 goto err;
231 }
232
233 char_two->m = (long)EC_GROUP_get_degree(group);
234
235 field_type = EC_GROUP_get_basis_type(group);
236
237 if (field_type == 0) {
238 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
239 goto err;
240 }
241 /* set base type OID */
242 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
243 ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
244 goto err;
245 }
246
247 if (field_type == NID_X9_62_tpBasis) {
248 unsigned int k;
249
250 if (!EC_GROUP_get_trinomial_basis(group, &k))
251 goto err;
252
253 char_two->p.tpBasis = ASN1_INTEGER_new();
254 if (char_two->p.tpBasis == NULL) {
255 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
256 goto err;
257 }
258 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
259 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
260 goto err;
261 }
262 } else if (field_type == NID_X9_62_ppBasis) {
263 unsigned int k1, k2, k3;
264
265 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
266 goto err;
267
268 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
269 if (char_two->p.ppBasis == NULL) {
270 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
271 goto err;
272 }
273
274 /* set k? values */
275 char_two->p.ppBasis->k1 = (long)k1;
276 char_two->p.ppBasis->k2 = (long)k2;
277 char_two->p.ppBasis->k3 = (long)k3;
278 } else { /* field_type == NID_X9_62_onBasis */
279
280 /* for ONB the parameters are (asn1) NULL */
281 char_two->p.onBasis = ASN1_NULL_new();
282 if (char_two->p.onBasis == NULL) {
283 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
284 goto err;
285 }
286 }
287 }
288 #endif
289 else {
290 ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
291 goto err;
292 }
293
294 ok = 1;
295
296 err:
297 BN_free(tmp);
298 return ok;
299 }
300
ec_asn1_group2curve(const EC_GROUP * group,X9_62_CURVE * curve)301 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
302 {
303 int ok = 0;
304 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
305 unsigned char *a_buf = NULL, *b_buf = NULL;
306 size_t len;
307
308 if (!group || !curve || !curve->a || !curve->b)
309 return 0;
310
311 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
312 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
313 goto err;
314 }
315
316 /* get a and b */
317 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
318 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
319 goto err;
320 }
321
322 /*
323 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
324 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
325 * definition of how to encode the field elements.
326 */
327 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
328 if ((a_buf = OPENSSL_malloc(len)) == NULL
329 || (b_buf = OPENSSL_malloc(len)) == NULL)
330 goto err;
331 if (BN_bn2binpad(tmp_1, a_buf, len) < 0
332 || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
333 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
334 goto err;
335 }
336
337 /* set a and b */
338 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
339 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
340 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
341 goto err;
342 }
343
344 /* set the seed (optional) */
345 if (group->seed) {
346 if (!curve->seed)
347 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
348 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
349 goto err;
350 }
351 ossl_asn1_string_set_bits_left(curve->seed, 0);
352 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
353 (int)group->seed_len)) {
354 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
355 goto err;
356 }
357 } else {
358 ASN1_BIT_STRING_free(curve->seed);
359 curve->seed = NULL;
360 }
361
362 ok = 1;
363
364 err:
365 OPENSSL_free(a_buf);
366 OPENSSL_free(b_buf);
367 BN_free(tmp_1);
368 BN_free(tmp_2);
369 return ok;
370 }
371
EC_GROUP_get_ecparameters(const EC_GROUP * group,ECPARAMETERS * params)372 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
373 ECPARAMETERS *params)
374 {
375 size_t len = 0;
376 ECPARAMETERS *ret = NULL;
377 const BIGNUM *tmp;
378 unsigned char *buffer = NULL;
379 const EC_POINT *point = NULL;
380 point_conversion_form_t form;
381 ASN1_INTEGER *orig;
382
383 if (params == NULL) {
384 if ((ret = ECPARAMETERS_new()) == NULL) {
385 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
386 goto err;
387 }
388 } else
389 ret = params;
390
391 /* set the version (always one) */
392 ret->version = (long)0x1;
393
394 /* set the fieldID */
395 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
396 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
397 goto err;
398 }
399
400 /* set the curve */
401 if (!ec_asn1_group2curve(group, ret->curve)) {
402 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
403 goto err;
404 }
405
406 /* set the base point */
407 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
408 ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
409 goto err;
410 }
411
412 form = EC_GROUP_get_point_conversion_form(group);
413
414 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
415 if (len == 0) {
416 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
417 goto err;
418 }
419 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
420 OPENSSL_free(buffer);
421 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
422 goto err;
423 }
424 ASN1_STRING_set0(ret->base, buffer, len);
425
426 /* set the order */
427 tmp = EC_GROUP_get0_order(group);
428 if (tmp == NULL) {
429 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
430 goto err;
431 }
432 ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
433 if (ret->order == NULL) {
434 ret->order = orig;
435 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
436 goto err;
437 }
438
439 /* set the cofactor (optional) */
440 tmp = EC_GROUP_get0_cofactor(group);
441 if (tmp != NULL) {
442 ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
443 if (ret->cofactor == NULL) {
444 ret->cofactor = orig;
445 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
446 goto err;
447 }
448 }
449
450 return ret;
451
452 err:
453 if (params == NULL)
454 ECPARAMETERS_free(ret);
455 return NULL;
456 }
457
EC_GROUP_get_ecpkparameters(const EC_GROUP * group,ECPKPARAMETERS * params)458 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
459 ECPKPARAMETERS *params)
460 {
461 int ok = 1, tmp;
462 ECPKPARAMETERS *ret = params;
463
464 if (ret == NULL) {
465 if ((ret = ECPKPARAMETERS_new()) == NULL) {
466 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
467 return NULL;
468 }
469 } else {
470 if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
471 ASN1_OBJECT_free(ret->value.named_curve);
472 else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
473 && ret->value.parameters != NULL)
474 ECPARAMETERS_free(ret->value.parameters);
475 }
476
477 if (EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE) {
478 /*
479 * use the asn1 OID to describe the elliptic curve parameters
480 */
481 tmp = EC_GROUP_get_curve_name(group);
482 if (tmp) {
483 ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
484
485 if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
486 ASN1_OBJECT_free(asn1obj);
487 ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
488 ok = 0;
489 } else {
490 ret->type = ECPKPARAMETERS_TYPE_NAMED;
491 ret->value.named_curve = asn1obj;
492 }
493 } else
494 /* we don't know the nid => ERROR */
495 ok = 0;
496 } else {
497 /* use the ECPARAMETERS structure */
498 ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
499 if ((ret->value.parameters = EC_GROUP_get_ecparameters(group, NULL)) == NULL)
500 ok = 0;
501 }
502
503 if (!ok) {
504 ECPKPARAMETERS_free(ret);
505 return NULL;
506 }
507 return ret;
508 }
509
EC_GROUP_new_from_ecparameters(const ECPARAMETERS * params)510 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
511 {
512 int ok = 0, tmp;
513 EC_GROUP *ret = NULL, *dup = NULL;
514 BIGNUM *p = NULL, *a = NULL, *b = NULL;
515 EC_POINT *point = NULL;
516 long field_bits;
517 int curve_name = NID_undef;
518 BN_CTX *ctx = NULL;
519
520 if (params->fieldID == NULL
521 || params->fieldID->fieldType == NULL
522 || params->fieldID->p.ptr == NULL) {
523 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
524 goto err;
525 }
526
527 /*
528 * Now extract the curve parameters a and b. Note that, although SEC 1
529 * specifies the length of their encodings, historical versions of OpenSSL
530 * encoded them incorrectly, so we must accept any length for backwards
531 * compatibility.
532 */
533 if (params->curve == NULL
534 || params->curve->a == NULL || params->curve->a->data == NULL
535 || params->curve->b == NULL || params->curve->b->data == NULL) {
536 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
537 goto err;
538 }
539 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
540 if (a == NULL) {
541 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
542 goto err;
543 }
544 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
545 if (b == NULL) {
546 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
547 goto err;
548 }
549
550 /* get the field parameters */
551 tmp = OBJ_obj2nid(params->fieldID->fieldType);
552 if (tmp == NID_X9_62_characteristic_two_field)
553 #ifdef OPENSSL_NO_EC2M
554 {
555 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
556 goto err;
557 }
558 #else
559 {
560 X9_62_CHARACTERISTIC_TWO *char_two;
561
562 char_two = params->fieldID->p.char_two;
563
564 field_bits = char_two->m;
565 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
566 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
567 goto err;
568 }
569
570 if ((p = BN_new()) == NULL) {
571 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
572 goto err;
573 }
574
575 /* get the base type */
576 tmp = OBJ_obj2nid(char_two->type);
577
578 if (tmp == NID_X9_62_tpBasis) {
579 long tmp_long;
580
581 if (!char_two->p.tpBasis) {
582 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
583 goto err;
584 }
585
586 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
587
588 if (!(char_two->m > tmp_long && tmp_long > 0)) {
589 ERR_raise(ERR_LIB_EC, EC_R_INVALID_TRINOMIAL_BASIS);
590 goto err;
591 }
592
593 /* create the polynomial */
594 if (!BN_set_bit(p, (int)char_two->m))
595 goto err;
596 if (!BN_set_bit(p, (int)tmp_long))
597 goto err;
598 if (!BN_set_bit(p, 0))
599 goto err;
600 } else if (tmp == NID_X9_62_ppBasis) {
601 X9_62_PENTANOMIAL *penta;
602
603 penta = char_two->p.ppBasis;
604 if (penta == NULL) {
605 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
606 goto err;
607 }
608
609 if (!(char_two->m > penta->k3 && penta->k3 > penta->k2
610 && penta->k2 > penta->k1 && penta->k1 > 0)) {
611 ERR_raise(ERR_LIB_EC, EC_R_INVALID_PENTANOMIAL_BASIS);
612 goto err;
613 }
614
615 /* create the polynomial */
616 if (!BN_set_bit(p, (int)char_two->m))
617 goto err;
618 if (!BN_set_bit(p, (int)penta->k1))
619 goto err;
620 if (!BN_set_bit(p, (int)penta->k2))
621 goto err;
622 if (!BN_set_bit(p, (int)penta->k3))
623 goto err;
624 if (!BN_set_bit(p, 0))
625 goto err;
626 } else if (tmp == NID_X9_62_onBasis) {
627 ERR_raise(ERR_LIB_EC, EC_R_NOT_IMPLEMENTED);
628 goto err;
629 } else { /* error */
630
631 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
632 goto err;
633 }
634
635 /* create the EC_GROUP structure */
636 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
637 }
638 #endif
639 else if (tmp == NID_X9_62_prime_field) {
640 /* we have a curve over a prime field */
641 /* extract the prime number */
642 if (params->fieldID->p.prime == NULL) {
643 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
644 goto err;
645 }
646 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
647 if (p == NULL) {
648 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
649 goto err;
650 }
651
652 if (BN_is_negative(p) || BN_is_zero(p)) {
653 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
654 goto err;
655 }
656
657 field_bits = BN_num_bits(p);
658 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
659 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
660 goto err;
661 }
662
663 /* create the EC_GROUP structure */
664 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
665 } else {
666 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
667 goto err;
668 }
669
670 if (ret == NULL) {
671 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
672 goto err;
673 }
674
675 /* extract seed (optional) */
676 if (params->curve->seed != NULL) {
677 /*
678 * This happens for instance with
679 * fuzz/corpora/asn1/65cf44e85614c62f10cf3b7a7184c26293a19e4a
680 * and causes the OPENSSL_malloc below to choke on the
681 * zero length allocation request.
682 */
683 if (params->curve->seed->length == 0) {
684 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
685 goto err;
686 }
687 OPENSSL_free(ret->seed);
688 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL)
689 goto err;
690 memcpy(ret->seed, params->curve->seed->data,
691 params->curve->seed->length);
692 ret->seed_len = params->curve->seed->length;
693 }
694
695 if (params->order == NULL
696 || params->base == NULL
697 || params->base->data == NULL
698 || params->base->length == 0) {
699 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
700 goto err;
701 }
702
703 if ((point = EC_POINT_new(ret)) == NULL)
704 goto err;
705
706 /* set the point conversion form */
707 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)(params->base->data[0] & ~0x01));
708
709 /* extract the ec point */
710 if (!EC_POINT_oct2point(ret, point, params->base->data,
711 params->base->length, NULL)) {
712 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
713 goto err;
714 }
715
716 /* extract the order */
717 if (ASN1_INTEGER_to_BN(params->order, a) == NULL) {
718 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
719 goto err;
720 }
721 if (BN_is_negative(a) || BN_is_zero(a)) {
722 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
723 goto err;
724 }
725 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
726 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
727 goto err;
728 }
729
730 /* extract the cofactor (optional) */
731 if (params->cofactor == NULL) {
732 BN_free(b);
733 b = NULL;
734 } else if (ASN1_INTEGER_to_BN(params->cofactor, b) == NULL) {
735 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
736 goto err;
737 }
738 /* set the generator, order and cofactor (if present) */
739 if (!EC_GROUP_set_generator(ret, point, a, b)) {
740 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
741 goto err;
742 }
743
744 /*
745 * Check if the explicit parameters group just created matches one of the
746 * built-in curves.
747 *
748 * We create a copy of the group just built, so that we can remove optional
749 * fields for the lookup: we do this to avoid the possibility that one of
750 * the optional parameters is used to force the library into using a less
751 * performant and less secure EC_METHOD instead of the specialized one.
752 * In any case, `seed` is not really used in any computation, while a
753 * cofactor different from the one in the built-in table is just
754 * mathematically wrong anyway and should not be used.
755 */
756 if ((ctx = BN_CTX_new()) == NULL) {
757 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
758 goto err;
759 }
760 if ((dup = EC_GROUP_dup(ret)) == NULL
761 || EC_GROUP_set_seed(dup, NULL, 0) != 1
762 || !EC_GROUP_set_generator(dup, point, a, NULL)) {
763 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
764 goto err;
765 }
766 if ((curve_name = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
767 /*
768 * The input explicit parameters successfully matched one of the
769 * built-in curves: often for built-in curves we have specialized
770 * methods with better performance and hardening.
771 *
772 * In this case we replace the `EC_GROUP` created through explicit
773 * parameters with one created from a named group.
774 */
775 EC_GROUP *named_group = NULL;
776
777 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
778 /*
779 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
780 * the same curve, we prefer the SECP nid when matching explicit
781 * parameters as that is associated with a specialized EC_METHOD.
782 */
783 if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
784 curve_name = NID_secp224r1;
785 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
786
787 if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
788 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
789 goto err;
790 }
791 EC_GROUP_free(ret);
792 ret = named_group;
793
794 /*
795 * Set the flag so that EC_GROUPs created from explicit parameters are
796 * serialized using explicit parameters by default.
797 */
798 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
799
800 /*
801 * If the input params do not contain the optional seed field we make
802 * sure it is not added to the returned group.
803 *
804 * The seed field is not really used inside libcrypto anyway, and
805 * adding it to parsed explicit parameter keys would alter their DER
806 * encoding output (because of the extra field) which could impact
807 * applications fingerprinting keys by their DER encoding.
808 */
809 if (params->curve->seed == NULL) {
810 if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
811 goto err;
812 }
813 }
814
815 ok = 1;
816
817 err:
818 if (!ok) {
819 EC_GROUP_free(ret);
820 ret = NULL;
821 }
822 EC_GROUP_free(dup);
823
824 BN_free(p);
825 BN_free(a);
826 BN_free(b);
827 EC_POINT_free(point);
828
829 BN_CTX_free(ctx);
830
831 return ret;
832 }
833
EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS * params)834 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
835 {
836 EC_GROUP *ret = NULL;
837 int tmp = 0;
838
839 if (params == NULL) {
840 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
841 return NULL;
842 }
843
844 if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
845 /* the curve is given by an OID */
846 tmp = OBJ_obj2nid(params->value.named_curve);
847 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
848 ERR_raise(ERR_LIB_EC, EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
849 return NULL;
850 }
851 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
852 } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
853 /* the parameters are given by an ECPARAMETERS structure */
854 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
855 if (!ret) {
856 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
857 return NULL;
858 }
859 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
860 } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
861 /* implicit parameters inherited from CA - unsupported */
862 return NULL;
863 } else {
864 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
865 return NULL;
866 }
867
868 return ret;
869 }
870
871 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
872
d2i_ECPKParameters(EC_GROUP ** a,const unsigned char ** in,long len)873 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
874 {
875 EC_GROUP *group = NULL;
876 ECPKPARAMETERS *params = NULL;
877 const unsigned char *p = *in;
878
879 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
880 ECPKPARAMETERS_free(params);
881 return NULL;
882 }
883
884 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
885 ECPKPARAMETERS_free(params);
886 return NULL;
887 }
888
889 if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
890 group->decoded_from_explicit_params = 1;
891
892 if (a) {
893 EC_GROUP_free(*a);
894 *a = group;
895 }
896
897 ECPKPARAMETERS_free(params);
898 *in = p;
899 return group;
900 }
901
i2d_ECPKParameters(const EC_GROUP * a,unsigned char ** out)902 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
903 {
904 int ret = 0;
905 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
906 if (tmp == NULL) {
907 ERR_raise(ERR_LIB_EC, EC_R_GROUP2PKPARAMETERS_FAILURE);
908 return 0;
909 }
910 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
911 ERR_raise(ERR_LIB_EC, EC_R_I2D_ECPKPARAMETERS_FAILURE);
912 ECPKPARAMETERS_free(tmp);
913 return 0;
914 }
915 ECPKPARAMETERS_free(tmp);
916 return ret;
917 }
918
919 /* some EC_KEY functions */
920
d2i_ECPrivateKey(EC_KEY ** a,const unsigned char ** in,long len)921 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
922 {
923 EC_KEY *ret = NULL;
924 EC_PRIVATEKEY *priv_key = NULL;
925 const unsigned char *p = *in;
926
927 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
928 return NULL;
929
930 if (a == NULL || *a == NULL) {
931 if ((ret = EC_KEY_new()) == NULL) {
932 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
933 goto err;
934 }
935 } else
936 ret = *a;
937
938 if (priv_key->parameters) {
939 EC_GROUP_free(ret->group);
940 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
941 if (ret->group != NULL
942 && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
943 ret->group->decoded_from_explicit_params = 1;
944 }
945
946 if (ret->group == NULL) {
947 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
948 goto err;
949 }
950
951 ret->version = priv_key->version;
952
953 if (priv_key->privateKey) {
954 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
955 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
956 ASN1_STRING_length(pkey))
957 == 0)
958 goto err;
959 } else {
960 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
961 goto err;
962 }
963
964 if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
965 EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
966
967 EC_POINT_clear_free(ret->pub_key);
968 ret->pub_key = EC_POINT_new(ret->group);
969 if (ret->pub_key == NULL) {
970 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
971 goto err;
972 }
973
974 if (priv_key->publicKey) {
975 const unsigned char *pub_oct;
976 int pub_oct_len;
977
978 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
979 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
980 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
981 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
982 goto err;
983 }
984 } else {
985 if (ret->group->meth->keygenpub == NULL
986 || ret->group->meth->keygenpub(ret) == 0)
987 goto err;
988 /* Remember the original private-key-only encoding. */
989 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
990 }
991
992 if (a)
993 *a = ret;
994 EC_PRIVATEKEY_free(priv_key);
995 *in = p;
996 ret->dirty_cnt++;
997 return ret;
998
999 err:
1000 if (a == NULL || *a != ret)
1001 EC_KEY_free(ret);
1002 EC_PRIVATEKEY_free(priv_key);
1003 return NULL;
1004 }
1005
i2d_ECPrivateKey(const EC_KEY * a,unsigned char ** out)1006 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1007 {
1008 int ret = 0, ok = 0;
1009 unsigned char *priv = NULL, *pub = NULL;
1010 size_t privlen = 0, publen = 0;
1011
1012 EC_PRIVATEKEY *priv_key = NULL;
1013
1014 if (a == NULL || a->group == NULL || (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1015 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1016 goto err;
1017 }
1018
1019 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1020 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1021 goto err;
1022 }
1023
1024 priv_key->version = a->version;
1025
1026 privlen = EC_KEY_priv2buf(a, &priv);
1027
1028 if (privlen == 0) {
1029 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1030 goto err;
1031 }
1032
1033 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1034 priv = NULL;
1035
1036 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1037 if ((priv_key->parameters = EC_GROUP_get_ecpkparameters(a->group,
1038 priv_key->parameters))
1039 == NULL) {
1040 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1041 goto err;
1042 }
1043 }
1044
1045 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1046 priv_key->publicKey = ASN1_BIT_STRING_new();
1047 if (priv_key->publicKey == NULL) {
1048 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
1049 goto err;
1050 }
1051
1052 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1053
1054 if (publen == 0) {
1055 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1056 goto err;
1057 }
1058
1059 ossl_asn1_string_set_bits_left(priv_key->publicKey, 0);
1060 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1061 pub = NULL;
1062 }
1063
1064 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1065 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1066 goto err;
1067 }
1068 ok = 1;
1069 err:
1070 OPENSSL_clear_free(priv, privlen);
1071 OPENSSL_free(pub);
1072 EC_PRIVATEKEY_free(priv_key);
1073 return (ok ? ret : 0);
1074 }
1075
i2d_ECParameters(const EC_KEY * a,unsigned char ** out)1076 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1077 {
1078 if (a == NULL) {
1079 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1080 return 0;
1081 }
1082 return i2d_ECPKParameters(a->group, out);
1083 }
1084
d2i_ECParameters(EC_KEY ** a,const unsigned char ** in,long len)1085 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1086 {
1087 EC_KEY *ret;
1088
1089 if (in == NULL || *in == NULL) {
1090 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1091 return NULL;
1092 }
1093
1094 if (a == NULL || *a == NULL) {
1095 if ((ret = EC_KEY_new()) == NULL) {
1096 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1097 return NULL;
1098 }
1099 } else
1100 ret = *a;
1101
1102 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1103 if (a == NULL || *a != ret)
1104 EC_KEY_free(ret);
1105 else
1106 ret->dirty_cnt++;
1107 return NULL;
1108 }
1109
1110 if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
1111 EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
1112
1113 ret->dirty_cnt++;
1114
1115 if (a)
1116 *a = ret;
1117
1118 return ret;
1119 }
1120
o2i_ECPublicKey(EC_KEY ** a,const unsigned char ** in,long len)1121 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1122 {
1123 EC_KEY *ret = NULL;
1124
1125 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1126 /*
1127 * sorry, but a EC_GROUP-structure is necessary to set the public key
1128 */
1129 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1130 return 0;
1131 }
1132 ret = *a;
1133 /* EC_KEY_opt2key updates dirty_cnt */
1134 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1135 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1136 return 0;
1137 }
1138 *in += len;
1139 return ret;
1140 }
1141
i2o_ECPublicKey(const EC_KEY * a,unsigned char ** out)1142 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1143 {
1144 size_t buf_len = 0;
1145 int new_buffer = 0;
1146
1147 if (a == NULL || a->pub_key == NULL) {
1148 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1149 return 0;
1150 }
1151
1152 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1153 a->conv_form, NULL, 0, NULL);
1154
1155 if (out == NULL || buf_len == 0)
1156 /* out == NULL => just return the length of the octet string */
1157 return buf_len;
1158
1159 if (*out == NULL) {
1160 if ((*out = OPENSSL_malloc(buf_len)) == NULL)
1161 return 0;
1162 new_buffer = 1;
1163 }
1164 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1165 *out, buf_len, NULL)) {
1166 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1167 if (new_buffer) {
1168 OPENSSL_free(*out);
1169 *out = NULL;
1170 }
1171 return 0;
1172 }
1173 if (!new_buffer)
1174 *out += buf_len;
1175 return buf_len;
1176 }
1177
1178 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG,ECDSA_SIG)1179 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1180
1181 #endif /* FIPS_MODULE */
1182
1183 ECDSA_SIG *ECDSA_SIG_new(void)
1184 {
1185 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1186
1187 return sig;
1188 }
1189
ECDSA_SIG_free(ECDSA_SIG * sig)1190 void ECDSA_SIG_free(ECDSA_SIG *sig)
1191 {
1192 if (sig == NULL)
1193 return;
1194 BN_clear_free(sig->r);
1195 BN_clear_free(sig->s);
1196 OPENSSL_free(sig);
1197 }
1198
d2i_ECDSA_SIG(ECDSA_SIG ** psig,const unsigned char ** ppin,long len)1199 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1200 {
1201 ECDSA_SIG *sig;
1202
1203 if (len < 0)
1204 return NULL;
1205 if (psig != NULL && *psig != NULL) {
1206 sig = *psig;
1207 } else {
1208 sig = ECDSA_SIG_new();
1209 if (sig == NULL)
1210 return NULL;
1211 }
1212 if (sig->r == NULL)
1213 sig->r = BN_new();
1214 if (sig->s == NULL)
1215 sig->s = BN_new();
1216 if (sig->r == NULL || sig->s == NULL
1217 || ossl_decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1218 if (psig == NULL || *psig == NULL)
1219 ECDSA_SIG_free(sig);
1220 return NULL;
1221 }
1222 if (psig != NULL && *psig == NULL)
1223 *psig = sig;
1224 return sig;
1225 }
1226
i2d_ECDSA_SIG(const ECDSA_SIG * sig,unsigned char ** ppout)1227 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1228 {
1229 BUF_MEM *buf = NULL;
1230 size_t encoded_len;
1231 WPACKET pkt;
1232
1233 if (ppout == NULL) {
1234 if (!WPACKET_init_null(&pkt, 0))
1235 return -1;
1236 } else if (*ppout == NULL) {
1237 if ((buf = BUF_MEM_new()) == NULL
1238 || !WPACKET_init_len(&pkt, buf, 0)) {
1239 BUF_MEM_free(buf);
1240 return -1;
1241 }
1242 } else {
1243 if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1244 return -1;
1245 }
1246
1247 if (!ossl_encode_der_dsa_sig(&pkt, sig->r, sig->s)
1248 || !WPACKET_get_total_written(&pkt, &encoded_len)
1249 || !WPACKET_finish(&pkt)) {
1250 BUF_MEM_free(buf);
1251 WPACKET_cleanup(&pkt);
1252 return -1;
1253 }
1254
1255 if (ppout != NULL) {
1256 if (*ppout == NULL) {
1257 *ppout = (unsigned char *)buf->data;
1258 buf->data = NULL;
1259 BUF_MEM_free(buf);
1260 } else {
1261 *ppout += encoded_len;
1262 }
1263 }
1264
1265 return (int)encoded_len;
1266 }
1267
ECDSA_SIG_get0(const ECDSA_SIG * sig,const BIGNUM ** pr,const BIGNUM ** ps)1268 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1269 {
1270 if (pr != NULL)
1271 *pr = sig->r;
1272 if (ps != NULL)
1273 *ps = sig->s;
1274 }
1275
ECDSA_SIG_get0_r(const ECDSA_SIG * sig)1276 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1277 {
1278 return sig->r;
1279 }
1280
ECDSA_SIG_get0_s(const ECDSA_SIG * sig)1281 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1282 {
1283 return sig->s;
1284 }
1285
ECDSA_SIG_set0(ECDSA_SIG * sig,BIGNUM * r,BIGNUM * s)1286 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1287 {
1288 if (r == NULL || s == NULL)
1289 return 0;
1290 BN_clear_free(sig->r);
1291 BN_clear_free(sig->s);
1292 sig->r = r;
1293 sig->s = s;
1294 return 1;
1295 }
1296
ECDSA_size(const EC_KEY * ec)1297 int ECDSA_size(const EC_KEY *ec)
1298 {
1299 int ret;
1300 ECDSA_SIG sig;
1301 const EC_GROUP *group;
1302 const BIGNUM *bn;
1303
1304 if (ec == NULL)
1305 return 0;
1306 group = EC_KEY_get0_group(ec);
1307 if (group == NULL)
1308 return 0;
1309
1310 bn = EC_GROUP_get0_order(group);
1311 if (bn == NULL)
1312 return 0;
1313
1314 sig.r = sig.s = (BIGNUM *)bn;
1315 ret = i2d_ECDSA_SIG(&sig, NULL);
1316
1317 if (ret < 0)
1318 ret = 0;
1319 return ret;
1320 }
1321