1 /*
2 * Copyright 2002-2021 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),
142 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
143 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
144 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
145
146 ASN1_SEQUENCE(ECPARAMETERS) = {
147 ASN1_EMBED(ECPARAMETERS, version, INT32),
148 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
149 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
150 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
151 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
152 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
153 } ASN1_SEQUENCE_END(ECPARAMETERS)
154
155 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
156 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
157
158 ASN1_CHOICE(ECPKPARAMETERS) = {
159 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
160 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
161 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
162 } ASN1_CHOICE_END(ECPKPARAMETERS)
163
164 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
165 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
166 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
167
168 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
169 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
170 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
171 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
172 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
173 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
174
175 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
176 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
177 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
178
179 /* some declarations of internal function */
180
181 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
182 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
183 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
184 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
185
186 /* the function definitions */
187
ec_asn1_group2fieldid(const EC_GROUP * group,X9_62_FIELDID * field)188 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
189 {
190 int ok = 0, nid;
191 BIGNUM *tmp = NULL;
192
193 if (group == NULL || field == NULL)
194 return 0;
195
196 /* clear the old values (if necessary) */
197 ASN1_OBJECT_free(field->fieldType);
198 ASN1_TYPE_free(field->p.other);
199
200 nid = EC_GROUP_get_field_type(group);
201 /* set OID for the field */
202 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
203 ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
204 goto err;
205 }
206
207 if (nid == NID_X9_62_prime_field) {
208 if ((tmp = BN_new()) == NULL) {
209 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
210 goto err;
211 }
212 /* the parameters are specified by the prime number p */
213 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
214 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
215 goto err;
216 }
217 /* set the prime number */
218 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
219 if (field->p.prime == NULL) {
220 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
221 goto err;
222 }
223 } else if (nid == NID_X9_62_characteristic_two_field)
224 #ifdef OPENSSL_NO_EC2M
225 {
226 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
227 goto err;
228 }
229 #else
230 {
231 int field_type;
232 X9_62_CHARACTERISTIC_TWO *char_two;
233
234 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
235 char_two = field->p.char_two;
236
237 if (char_two == NULL) {
238 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
239 goto err;
240 }
241
242 char_two->m = (long)EC_GROUP_get_degree(group);
243
244 field_type = EC_GROUP_get_basis_type(group);
245
246 if (field_type == 0) {
247 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
248 goto err;
249 }
250 /* set base type OID */
251 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
252 ERR_raise(ERR_LIB_EC, ERR_R_OBJ_LIB);
253 goto err;
254 }
255
256 if (field_type == NID_X9_62_tpBasis) {
257 unsigned int k;
258
259 if (!EC_GROUP_get_trinomial_basis(group, &k))
260 goto err;
261
262 char_two->p.tpBasis = ASN1_INTEGER_new();
263 if (char_two->p.tpBasis == NULL) {
264 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
265 goto err;
266 }
267 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
268 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
269 goto err;
270 }
271 } else if (field_type == NID_X9_62_ppBasis) {
272 unsigned int k1, k2, k3;
273
274 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
275 goto err;
276
277 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
278 if (char_two->p.ppBasis == NULL) {
279 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
280 goto err;
281 }
282
283 /* set k? values */
284 char_two->p.ppBasis->k1 = (long)k1;
285 char_two->p.ppBasis->k2 = (long)k2;
286 char_two->p.ppBasis->k3 = (long)k3;
287 } else { /* field_type == NID_X9_62_onBasis */
288
289 /* for ONB the parameters are (asn1) NULL */
290 char_two->p.onBasis = ASN1_NULL_new();
291 if (char_two->p.onBasis == NULL) {
292 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
293 goto err;
294 }
295 }
296 }
297 #endif
298 else {
299 ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD);
300 goto err;
301 }
302
303 ok = 1;
304
305 err:
306 BN_free(tmp);
307 return ok;
308 }
309
ec_asn1_group2curve(const EC_GROUP * group,X9_62_CURVE * curve)310 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
311 {
312 int ok = 0;
313 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
314 unsigned char *a_buf = NULL, *b_buf = NULL;
315 size_t len;
316
317 if (!group || !curve || !curve->a || !curve->b)
318 return 0;
319
320 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
321 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
322 goto err;
323 }
324
325 /* get a and b */
326 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
327 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
328 goto err;
329 }
330
331 /*
332 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
333 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
334 * definition of how to encode the field elements.
335 */
336 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
337 if ((a_buf = OPENSSL_malloc(len)) == NULL
338 || (b_buf = OPENSSL_malloc(len)) == NULL)
339 goto err;
340 if (BN_bn2binpad(tmp_1, a_buf, len) < 0
341 || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
342 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
343 goto err;
344 }
345
346 /* set a and b */
347 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
348 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
349 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
350 goto err;
351 }
352
353 /* set the seed (optional) */
354 if (group->seed) {
355 if (!curve->seed)
356 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
357 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
358 goto err;
359 }
360 ossl_asn1_string_set_bits_left(curve->seed, 0);
361 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
362 (int)group->seed_len)) {
363 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
364 goto err;
365 }
366 } else {
367 ASN1_BIT_STRING_free(curve->seed);
368 curve->seed = NULL;
369 }
370
371 ok = 1;
372
373 err:
374 OPENSSL_free(a_buf);
375 OPENSSL_free(b_buf);
376 BN_free(tmp_1);
377 BN_free(tmp_2);
378 return ok;
379 }
380
EC_GROUP_get_ecparameters(const EC_GROUP * group,ECPARAMETERS * params)381 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
382 ECPARAMETERS *params)
383 {
384 size_t len = 0;
385 ECPARAMETERS *ret = NULL;
386 const BIGNUM *tmp;
387 unsigned char *buffer = NULL;
388 const EC_POINT *point = NULL;
389 point_conversion_form_t form;
390 ASN1_INTEGER *orig;
391
392 if (params == NULL) {
393 if ((ret = ECPARAMETERS_new()) == NULL) {
394 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
395 goto err;
396 }
397 } else
398 ret = params;
399
400 /* set the version (always one) */
401 ret->version = (long)0x1;
402
403 /* set the fieldID */
404 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
405 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
406 goto err;
407 }
408
409 /* set the curve */
410 if (!ec_asn1_group2curve(group, ret->curve)) {
411 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
412 goto err;
413 }
414
415 /* set the base point */
416 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
417 ERR_raise(ERR_LIB_EC, EC_R_UNDEFINED_GENERATOR);
418 goto err;
419 }
420
421 form = EC_GROUP_get_point_conversion_form(group);
422
423 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
424 if (len == 0) {
425 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
426 goto err;
427 }
428 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
429 OPENSSL_free(buffer);
430 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
431 goto err;
432 }
433 ASN1_STRING_set0(ret->base, buffer, len);
434
435 /* set the order */
436 tmp = EC_GROUP_get0_order(group);
437 if (tmp == NULL) {
438 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
439 goto err;
440 }
441 ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
442 if (ret->order == NULL) {
443 ret->order = orig;
444 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
445 goto err;
446 }
447
448 /* set the cofactor (optional) */
449 tmp = EC_GROUP_get0_cofactor(group);
450 if (tmp != NULL) {
451 ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
452 if (ret->cofactor == NULL) {
453 ret->cofactor = orig;
454 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
455 goto err;
456 }
457 }
458
459 return ret;
460
461 err:
462 if (params == NULL)
463 ECPARAMETERS_free(ret);
464 return NULL;
465 }
466
EC_GROUP_get_ecpkparameters(const EC_GROUP * group,ECPKPARAMETERS * params)467 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
468 ECPKPARAMETERS *params)
469 {
470 int ok = 1, tmp;
471 ECPKPARAMETERS *ret = params;
472
473 if (ret == NULL) {
474 if ((ret = ECPKPARAMETERS_new()) == NULL) {
475 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
476 return NULL;
477 }
478 } else {
479 if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
480 ASN1_OBJECT_free(ret->value.named_curve);
481 else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
482 && ret->value.parameters != NULL)
483 ECPARAMETERS_free(ret->value.parameters);
484 }
485
486 if (EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE) {
487 /*
488 * use the asn1 OID to describe the elliptic curve parameters
489 */
490 tmp = EC_GROUP_get_curve_name(group);
491 if (tmp) {
492 ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
493
494 if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
495 ASN1_OBJECT_free(asn1obj);
496 ERR_raise(ERR_LIB_EC, EC_R_MISSING_OID);
497 ok = 0;
498 } else {
499 ret->type = ECPKPARAMETERS_TYPE_NAMED;
500 ret->value.named_curve = asn1obj;
501 }
502 } else
503 /* we don't know the nid => ERROR */
504 ok = 0;
505 } else {
506 /* use the ECPARAMETERS structure */
507 ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
508 if ((ret->value.parameters =
509 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
510 ok = 0;
511 }
512
513 if (!ok) {
514 ECPKPARAMETERS_free(ret);
515 return NULL;
516 }
517 return ret;
518 }
519
EC_GROUP_new_from_ecparameters(const ECPARAMETERS * params)520 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
521 {
522 int ok = 0, tmp;
523 EC_GROUP *ret = NULL, *dup = NULL;
524 BIGNUM *p = NULL, *a = NULL, *b = NULL;
525 EC_POINT *point = NULL;
526 long field_bits;
527 int curve_name = NID_undef;
528 BN_CTX *ctx = NULL;
529
530 if (params->fieldID == NULL
531 || params->fieldID->fieldType == NULL
532 || params->fieldID->p.ptr == NULL) {
533 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
534 goto err;
535 }
536
537 /*
538 * Now extract the curve parameters a and b. Note that, although SEC 1
539 * specifies the length of their encodings, historical versions of OpenSSL
540 * encoded them incorrectly, so we must accept any length for backwards
541 * compatibility.
542 */
543 if (params->curve == NULL
544 || params->curve->a == NULL || params->curve->a->data == NULL
545 || params->curve->b == NULL || params->curve->b->data == NULL) {
546 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
547 goto err;
548 }
549 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
550 if (a == NULL) {
551 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
552 goto err;
553 }
554 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
555 if (b == NULL) {
556 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
557 goto err;
558 }
559
560 /* get the field parameters */
561 tmp = OBJ_obj2nid(params->fieldID->fieldType);
562 if (tmp == NID_X9_62_characteristic_two_field)
563 #ifdef OPENSSL_NO_EC2M
564 {
565 ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED);
566 goto err;
567 }
568 #else
569 {
570 X9_62_CHARACTERISTIC_TWO *char_two;
571
572 char_two = params->fieldID->p.char_two;
573
574 field_bits = char_two->m;
575 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
576 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
577 goto err;
578 }
579
580 if ((p = BN_new()) == NULL) {
581 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
582 goto err;
583 }
584
585 /* get the base type */
586 tmp = OBJ_obj2nid(char_two->type);
587
588 if (tmp == NID_X9_62_tpBasis) {
589 long tmp_long;
590
591 if (!char_two->p.tpBasis) {
592 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
593 goto err;
594 }
595
596 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
597
598 if (!(char_two->m > tmp_long && tmp_long > 0)) {
599 ERR_raise(ERR_LIB_EC, EC_R_INVALID_TRINOMIAL_BASIS);
600 goto err;
601 }
602
603 /* create the polynomial */
604 if (!BN_set_bit(p, (int)char_two->m))
605 goto err;
606 if (!BN_set_bit(p, (int)tmp_long))
607 goto err;
608 if (!BN_set_bit(p, 0))
609 goto err;
610 } else if (tmp == NID_X9_62_ppBasis) {
611 X9_62_PENTANOMIAL *penta;
612
613 penta = char_two->p.ppBasis;
614 if (penta == NULL) {
615 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
616 goto err;
617 }
618
619 if (!
620 (char_two->m > penta->k3 && penta->k3 > penta->k2
621 && penta->k2 > penta->k1 && penta->k1 > 0)) {
622 ERR_raise(ERR_LIB_EC, EC_R_INVALID_PENTANOMIAL_BASIS);
623 goto err;
624 }
625
626 /* create the polynomial */
627 if (!BN_set_bit(p, (int)char_two->m))
628 goto err;
629 if (!BN_set_bit(p, (int)penta->k1))
630 goto err;
631 if (!BN_set_bit(p, (int)penta->k2))
632 goto err;
633 if (!BN_set_bit(p, (int)penta->k3))
634 goto err;
635 if (!BN_set_bit(p, 0))
636 goto err;
637 } else if (tmp == NID_X9_62_onBasis) {
638 ERR_raise(ERR_LIB_EC, EC_R_NOT_IMPLEMENTED);
639 goto err;
640 } else { /* error */
641
642 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
643 goto err;
644 }
645
646 /* create the EC_GROUP structure */
647 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
648 }
649 #endif
650 else if (tmp == NID_X9_62_prime_field) {
651 /* we have a curve over a prime field */
652 /* extract the prime number */
653 if (params->fieldID->p.prime == NULL) {
654 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
655 goto err;
656 }
657 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
658 if (p == NULL) {
659 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
660 goto err;
661 }
662
663 if (BN_is_negative(p) || BN_is_zero(p)) {
664 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
665 goto err;
666 }
667
668 field_bits = BN_num_bits(p);
669 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
670 ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE);
671 goto err;
672 }
673
674 /* create the EC_GROUP structure */
675 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
676 } else {
677 ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD);
678 goto err;
679 }
680
681 if (ret == NULL) {
682 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
683 goto err;
684 }
685
686 /* extract seed (optional) */
687 if (params->curve->seed != NULL) {
688 /*
689 * This happens for instance with
690 * fuzz/corpora/asn1/65cf44e85614c62f10cf3b7a7184c26293a19e4a
691 * and causes the OPENSSL_malloc below to choke on the
692 * zero length allocation request.
693 */
694 if (params->curve->seed->length == 0) {
695 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
696 goto err;
697 }
698 OPENSSL_free(ret->seed);
699 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL)
700 goto err;
701 memcpy(ret->seed, params->curve->seed->data,
702 params->curve->seed->length);
703 ret->seed_len = params->curve->seed->length;
704 }
705
706 if (params->order == NULL
707 || params->base == NULL
708 || params->base->data == NULL
709 || params->base->length == 0) {
710 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
711 goto err;
712 }
713
714 if ((point = EC_POINT_new(ret)) == NULL)
715 goto err;
716
717 /* set the point conversion form */
718 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
719 (params->base->data[0] & ~0x01));
720
721 /* extract the ec point */
722 if (!EC_POINT_oct2point(ret, point, params->base->data,
723 params->base->length, NULL)) {
724 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
725 goto err;
726 }
727
728 /* extract the order */
729 if (ASN1_INTEGER_to_BN(params->order, a) == NULL) {
730 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
731 goto err;
732 }
733 if (BN_is_negative(a) || BN_is_zero(a)) {
734 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
735 goto err;
736 }
737 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
738 ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER);
739 goto err;
740 }
741
742 /* extract the cofactor (optional) */
743 if (params->cofactor == NULL) {
744 BN_free(b);
745 b = NULL;
746 } else if (ASN1_INTEGER_to_BN(params->cofactor, b) == NULL) {
747 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
748 goto err;
749 }
750 /* set the generator, order and cofactor (if present) */
751 if (!EC_GROUP_set_generator(ret, point, a, b)) {
752 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
753 goto err;
754 }
755
756 /*
757 * Check if the explicit parameters group just created matches one of the
758 * built-in curves.
759 *
760 * We create a copy of the group just built, so that we can remove optional
761 * fields for the lookup: we do this to avoid the possibility that one of
762 * the optional parameters is used to force the library into using a less
763 * performant and less secure EC_METHOD instead of the specialized one.
764 * In any case, `seed` is not really used in any computation, while a
765 * cofactor different from the one in the built-in table is just
766 * mathematically wrong anyway and should not be used.
767 */
768 if ((ctx = BN_CTX_new()) == NULL) {
769 ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB);
770 goto err;
771 }
772 if ((dup = EC_GROUP_dup(ret)) == NULL
773 || EC_GROUP_set_seed(dup, NULL, 0) != 1
774 || !EC_GROUP_set_generator(dup, point, a, NULL)) {
775 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
776 goto err;
777 }
778 if ((curve_name = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
779 /*
780 * The input explicit parameters successfully matched one of the
781 * built-in curves: often for built-in curves we have specialized
782 * methods with better performance and hardening.
783 *
784 * In this case we replace the `EC_GROUP` created through explicit
785 * parameters with one created from a named group.
786 */
787 EC_GROUP *named_group = NULL;
788
789 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
790 /*
791 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
792 * the same curve, we prefer the SECP nid when matching explicit
793 * parameters as that is associated with a specialized EC_METHOD.
794 */
795 if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
796 curve_name = NID_secp224r1;
797 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
798
799 if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
800 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
801 goto err;
802 }
803 EC_GROUP_free(ret);
804 ret = named_group;
805
806 /*
807 * Set the flag so that EC_GROUPs created from explicit parameters are
808 * serialized using explicit parameters by default.
809 */
810 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
811
812 /*
813 * If the input params do not contain the optional seed field we make
814 * sure it is not added to the returned group.
815 *
816 * The seed field is not really used inside libcrypto anyway, and
817 * adding it to parsed explicit parameter keys would alter their DER
818 * encoding output (because of the extra field) which could impact
819 * applications fingerprinting keys by their DER encoding.
820 */
821 if (params->curve->seed == NULL) {
822 if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
823 goto err;
824 }
825 }
826
827 ok = 1;
828
829 err:
830 if (!ok) {
831 EC_GROUP_free(ret);
832 ret = NULL;
833 }
834 EC_GROUP_free(dup);
835
836 BN_free(p);
837 BN_free(a);
838 BN_free(b);
839 EC_POINT_free(point);
840
841 BN_CTX_free(ctx);
842
843 return ret;
844 }
845
EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS * params)846 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
847 {
848 EC_GROUP *ret = NULL;
849 int tmp = 0;
850
851 if (params == NULL) {
852 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PARAMETERS);
853 return NULL;
854 }
855
856 if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
857 /* the curve is given by an OID */
858 tmp = OBJ_obj2nid(params->value.named_curve);
859 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
860 ERR_raise(ERR_LIB_EC, EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
861 return NULL;
862 }
863 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
864 } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
865 /* the parameters are given by an ECPARAMETERS structure */
866 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
867 if (!ret) {
868 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
869 return NULL;
870 }
871 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
872 } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
873 /* implicit parameters inherited from CA - unsupported */
874 return NULL;
875 } else {
876 ERR_raise(ERR_LIB_EC, EC_R_ASN1_ERROR);
877 return NULL;
878 }
879
880 return ret;
881 }
882
883 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
884
d2i_ECPKParameters(EC_GROUP ** a,const unsigned char ** in,long len)885 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
886 {
887 EC_GROUP *group = NULL;
888 ECPKPARAMETERS *params = NULL;
889 const unsigned char *p = *in;
890
891 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
892 ECPKPARAMETERS_free(params);
893 return NULL;
894 }
895
896 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
897 ECPKPARAMETERS_free(params);
898 return NULL;
899 }
900
901 if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
902 group->decoded_from_explicit_params = 1;
903
904 if (a) {
905 EC_GROUP_free(*a);
906 *a = group;
907 }
908
909 ECPKPARAMETERS_free(params);
910 *in = p;
911 return group;
912 }
913
i2d_ECPKParameters(const EC_GROUP * a,unsigned char ** out)914 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
915 {
916 int ret = 0;
917 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
918 if (tmp == NULL) {
919 ERR_raise(ERR_LIB_EC, EC_R_GROUP2PKPARAMETERS_FAILURE);
920 return 0;
921 }
922 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
923 ERR_raise(ERR_LIB_EC, EC_R_I2D_ECPKPARAMETERS_FAILURE);
924 ECPKPARAMETERS_free(tmp);
925 return 0;
926 }
927 ECPKPARAMETERS_free(tmp);
928 return ret;
929 }
930
931 /* some EC_KEY functions */
932
d2i_ECPrivateKey(EC_KEY ** a,const unsigned char ** in,long len)933 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
934 {
935 EC_KEY *ret = NULL;
936 EC_PRIVATEKEY *priv_key = NULL;
937 const unsigned char *p = *in;
938
939 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL)
940 return NULL;
941
942 if (a == NULL || *a == NULL) {
943 if ((ret = EC_KEY_new()) == NULL) {
944 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
945 goto err;
946 }
947 } else
948 ret = *a;
949
950 if (priv_key->parameters) {
951 EC_GROUP_free(ret->group);
952 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
953 if (ret->group != NULL
954 && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
955 ret->group->decoded_from_explicit_params = 1;
956 }
957
958 if (ret->group == NULL) {
959 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
960 goto err;
961 }
962
963 ret->version = priv_key->version;
964
965 if (priv_key->privateKey) {
966 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
967 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
968 ASN1_STRING_length(pkey)) == 0)
969 goto err;
970 } else {
971 ERR_raise(ERR_LIB_EC, EC_R_MISSING_PRIVATE_KEY);
972 goto err;
973 }
974
975 if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
976 EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
977
978 EC_POINT_clear_free(ret->pub_key);
979 ret->pub_key = EC_POINT_new(ret->group);
980 if (ret->pub_key == NULL) {
981 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
982 goto err;
983 }
984
985 if (priv_key->publicKey) {
986 const unsigned char *pub_oct;
987 int pub_oct_len;
988
989 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
990 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
991 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
992 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
993 goto err;
994 }
995 } else {
996 if (ret->group->meth->keygenpub == NULL
997 || ret->group->meth->keygenpub(ret) == 0)
998 goto err;
999 /* Remember the original private-key-only encoding. */
1000 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1001 }
1002
1003 if (a)
1004 *a = ret;
1005 EC_PRIVATEKEY_free(priv_key);
1006 *in = p;
1007 ret->dirty_cnt++;
1008 return ret;
1009
1010 err:
1011 if (a == NULL || *a != ret)
1012 EC_KEY_free(ret);
1013 EC_PRIVATEKEY_free(priv_key);
1014 return NULL;
1015 }
1016
i2d_ECPrivateKey(const EC_KEY * a,unsigned char ** out)1017 int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1018 {
1019 int ret = 0, ok = 0;
1020 unsigned char *priv= NULL, *pub= NULL;
1021 size_t privlen = 0, publen = 0;
1022
1023 EC_PRIVATEKEY *priv_key = NULL;
1024
1025 if (a == NULL || a->group == NULL ||
1026 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1027 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1028 goto err;
1029 }
1030
1031 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1032 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1033 goto err;
1034 }
1035
1036 priv_key->version = a->version;
1037
1038 privlen = EC_KEY_priv2buf(a, &priv);
1039
1040 if (privlen == 0) {
1041 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1042 goto err;
1043 }
1044
1045 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1046 priv = NULL;
1047
1048 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1049 if ((priv_key->parameters =
1050 EC_GROUP_get_ecpkparameters(a->group,
1051 priv_key->parameters)) == NULL) {
1052 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1053 goto err;
1054 }
1055 }
1056
1057 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1058 priv_key->publicKey = ASN1_BIT_STRING_new();
1059 if (priv_key->publicKey == NULL) {
1060 ERR_raise(ERR_LIB_EC, ERR_R_ASN1_LIB);
1061 goto err;
1062 }
1063
1064 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1065
1066 if (publen == 0) {
1067 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1068 goto err;
1069 }
1070
1071 ossl_asn1_string_set_bits_left(priv_key->publicKey, 0);
1072 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1073 pub = NULL;
1074 }
1075
1076 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1077 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1078 goto err;
1079 }
1080 ok = 1;
1081 err:
1082 OPENSSL_clear_free(priv, privlen);
1083 OPENSSL_free(pub);
1084 EC_PRIVATEKEY_free(priv_key);
1085 return (ok ? ret : 0);
1086 }
1087
i2d_ECParameters(const EC_KEY * a,unsigned char ** out)1088 int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1089 {
1090 if (a == NULL) {
1091 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1092 return 0;
1093 }
1094 return i2d_ECPKParameters(a->group, out);
1095 }
1096
d2i_ECParameters(EC_KEY ** a,const unsigned char ** in,long len)1097 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1098 {
1099 EC_KEY *ret;
1100
1101 if (in == NULL || *in == NULL) {
1102 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1103 return NULL;
1104 }
1105
1106 if (a == NULL || *a == NULL) {
1107 if ((ret = EC_KEY_new()) == NULL) {
1108 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1109 return NULL;
1110 }
1111 } else
1112 ret = *a;
1113
1114 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1115 if (a == NULL || *a != ret)
1116 EC_KEY_free(ret);
1117 else
1118 ret->dirty_cnt++;
1119 return NULL;
1120 }
1121
1122 if (EC_GROUP_get_curve_name(ret->group) == NID_sm2)
1123 EC_KEY_set_flags(ret, EC_FLAG_SM2_RANGE);
1124
1125 ret->dirty_cnt++;
1126
1127 if (a)
1128 *a = ret;
1129
1130 return ret;
1131 }
1132
o2i_ECPublicKey(EC_KEY ** a,const unsigned char ** in,long len)1133 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1134 {
1135 EC_KEY *ret = NULL;
1136
1137 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1138 /*
1139 * sorry, but a EC_GROUP-structure is necessary to set the public key
1140 */
1141 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1142 return 0;
1143 }
1144 ret = *a;
1145 /* EC_KEY_opt2key updates dirty_cnt */
1146 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1147 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1148 return 0;
1149 }
1150 *in += len;
1151 return ret;
1152 }
1153
i2o_ECPublicKey(const EC_KEY * a,unsigned char ** out)1154 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1155 {
1156 size_t buf_len = 0;
1157 int new_buffer = 0;
1158
1159 if (a == NULL || a->pub_key == NULL) {
1160 ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER);
1161 return 0;
1162 }
1163
1164 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1165 a->conv_form, NULL, 0, NULL);
1166
1167 if (out == NULL || buf_len == 0)
1168 /* out == NULL => just return the length of the octet string */
1169 return buf_len;
1170
1171 if (*out == NULL) {
1172 if ((*out = OPENSSL_malloc(buf_len)) == NULL)
1173 return 0;
1174 new_buffer = 1;
1175 }
1176 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1177 *out, buf_len, NULL)) {
1178 ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB);
1179 if (new_buffer) {
1180 OPENSSL_free(*out);
1181 *out = NULL;
1182 }
1183 return 0;
1184 }
1185 if (!new_buffer)
1186 *out += buf_len;
1187 return buf_len;
1188 }
1189
1190 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG,ECDSA_SIG)1191 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1192
1193 #endif /* FIPS_MODULE */
1194
1195 ECDSA_SIG *ECDSA_SIG_new(void)
1196 {
1197 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1198
1199 return sig;
1200 }
1201
ECDSA_SIG_free(ECDSA_SIG * sig)1202 void ECDSA_SIG_free(ECDSA_SIG *sig)
1203 {
1204 if (sig == NULL)
1205 return;
1206 BN_clear_free(sig->r);
1207 BN_clear_free(sig->s);
1208 OPENSSL_free(sig);
1209 }
1210
d2i_ECDSA_SIG(ECDSA_SIG ** psig,const unsigned char ** ppin,long len)1211 ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1212 {
1213 ECDSA_SIG *sig;
1214
1215 if (len < 0)
1216 return NULL;
1217 if (psig != NULL && *psig != NULL) {
1218 sig = *psig;
1219 } else {
1220 sig = ECDSA_SIG_new();
1221 if (sig == NULL)
1222 return NULL;
1223 }
1224 if (sig->r == NULL)
1225 sig->r = BN_new();
1226 if (sig->s == NULL)
1227 sig->s = BN_new();
1228 if (sig->r == NULL || sig->s == NULL
1229 || ossl_decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1230 if (psig == NULL || *psig == NULL)
1231 ECDSA_SIG_free(sig);
1232 return NULL;
1233 }
1234 if (psig != NULL && *psig == NULL)
1235 *psig = sig;
1236 return sig;
1237 }
1238
i2d_ECDSA_SIG(const ECDSA_SIG * sig,unsigned char ** ppout)1239 int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1240 {
1241 BUF_MEM *buf = NULL;
1242 size_t encoded_len;
1243 WPACKET pkt;
1244
1245 if (ppout == NULL) {
1246 if (!WPACKET_init_null(&pkt, 0))
1247 return -1;
1248 } else if (*ppout == NULL) {
1249 if ((buf = BUF_MEM_new()) == NULL
1250 || !WPACKET_init_len(&pkt, buf, 0)) {
1251 BUF_MEM_free(buf);
1252 return -1;
1253 }
1254 } else {
1255 if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1256 return -1;
1257 }
1258
1259 if (!ossl_encode_der_dsa_sig(&pkt, sig->r, sig->s)
1260 || !WPACKET_get_total_written(&pkt, &encoded_len)
1261 || !WPACKET_finish(&pkt)) {
1262 BUF_MEM_free(buf);
1263 WPACKET_cleanup(&pkt);
1264 return -1;
1265 }
1266
1267 if (ppout != NULL) {
1268 if (*ppout == NULL) {
1269 *ppout = (unsigned char *)buf->data;
1270 buf->data = NULL;
1271 BUF_MEM_free(buf);
1272 } else {
1273 *ppout += encoded_len;
1274 }
1275 }
1276
1277 return (int)encoded_len;
1278 }
1279
ECDSA_SIG_get0(const ECDSA_SIG * sig,const BIGNUM ** pr,const BIGNUM ** ps)1280 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1281 {
1282 if (pr != NULL)
1283 *pr = sig->r;
1284 if (ps != NULL)
1285 *ps = sig->s;
1286 }
1287
ECDSA_SIG_get0_r(const ECDSA_SIG * sig)1288 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1289 {
1290 return sig->r;
1291 }
1292
ECDSA_SIG_get0_s(const ECDSA_SIG * sig)1293 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1294 {
1295 return sig->s;
1296 }
1297
ECDSA_SIG_set0(ECDSA_SIG * sig,BIGNUM * r,BIGNUM * s)1298 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1299 {
1300 if (r == NULL || s == NULL)
1301 return 0;
1302 BN_clear_free(sig->r);
1303 BN_clear_free(sig->s);
1304 sig->r = r;
1305 sig->s = s;
1306 return 1;
1307 }
1308
ECDSA_size(const EC_KEY * ec)1309 int ECDSA_size(const EC_KEY *ec)
1310 {
1311 int ret;
1312 ECDSA_SIG sig;
1313 const EC_GROUP *group;
1314 const BIGNUM *bn;
1315
1316 if (ec == NULL)
1317 return 0;
1318 group = EC_KEY_get0_group(ec);
1319 if (group == NULL)
1320 return 0;
1321
1322 bn = EC_GROUP_get0_order(group);
1323 if (bn == NULL)
1324 return 0;
1325
1326 sig.r = sig.s = (BIGNUM *)bn;
1327 ret = i2d_ECDSA_SIG(&sig, NULL);
1328
1329 if (ret < 0)
1330 ret = 0;
1331 return ret;
1332 }
1333
