1/*
2 * Copyright 2002-2018 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#include <string.h>
11#include "ec_local.h"
12#include <openssl/err.h>
13#include <openssl/asn1t.h>
14#include <openssl/objects.h>
15#include "internal/nelem.h"
16#include "crypto/asn1_dsa.h"
17
18#ifndef FIPS_MODE
19
20int EC_GROUP_get_basis_type(const EC_GROUP *group)
21{
22 int i;
23
24 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
25 NID_X9_62_characteristic_two_field)
26 /* everything else is currently not supported */
27 return 0;
28
29 /* Find the last non-zero element of group->poly[] */
30 for (i = 0;
31 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
32 i++)
33 continue;
34
35 if (i == 4)
36 return NID_X9_62_ppBasis;
37 else if (i == 2)
38 return NID_X9_62_tpBasis;
39 else
40 /* everything else is currently not supported */
41 return 0;
42}
43
44#ifndef OPENSSL_NO_EC2M
45int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
46{
47 if (group == NULL)
48 return 0;
49
50 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
51 NID_X9_62_characteristic_two_field
52 || !((group->poly[0] != 0) && (group->poly[1] != 0)
53 && (group->poly[2] == 0))) {
54 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
55 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
56 return 0;
57 }
58
59 if (k)
60 *k = group->poly[1];
61
62 return 1;
63}
64
65int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
66 unsigned int *k2, unsigned int *k3)
67{
68 if (group == NULL)
69 return 0;
70
71 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
72 NID_X9_62_characteristic_two_field
73 || !((group->poly[0] != 0) && (group->poly[1] != 0)
74 && (group->poly[2] != 0) && (group->poly[3] != 0)
75 && (group->poly[4] == 0))) {
76 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
77 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
78 return 0;
79 }
80
81 if (k1)
82 *k1 = group->poly[3];
83 if (k2)
84 *k2 = group->poly[2];
85 if (k3)
86 *k3 = group->poly[1];
87
88 return 1;
89}
90#endif
91
92/* some structures needed for the asn1 encoding */
93typedef struct x9_62_pentanomial_st {
94 int32_t k1;
95 int32_t k2;
96 int32_t k3;
97} X9_62_PENTANOMIAL;
98
99typedef struct x9_62_characteristic_two_st {
100 int32_t m;
101 ASN1_OBJECT *type;
102 union {
103 char *ptr;
104 /* NID_X9_62_onBasis */
105 ASN1_NULL *onBasis;
106 /* NID_X9_62_tpBasis */
107 ASN1_INTEGER *tpBasis;
108 /* NID_X9_62_ppBasis */
109 X9_62_PENTANOMIAL *ppBasis;
110 /* anything else */
111 ASN1_TYPE *other;
112 } p;
113} X9_62_CHARACTERISTIC_TWO;
114
115typedef struct x9_62_fieldid_st {
116 ASN1_OBJECT *fieldType;
117 union {
118 char *ptr;
119 /* NID_X9_62_prime_field */
120 ASN1_INTEGER *prime;
121 /* NID_X9_62_characteristic_two_field */
122 X9_62_CHARACTERISTIC_TWO *char_two;
123 /* anything else */
124 ASN1_TYPE *other;
125 } p;
126} X9_62_FIELDID;
127
128typedef struct x9_62_curve_st {
129 ASN1_OCTET_STRING *a;
130 ASN1_OCTET_STRING *b;
131 ASN1_BIT_STRING *seed;
132} X9_62_CURVE;
133
134struct ec_parameters_st {
135 int32_t version;
136 X9_62_FIELDID *fieldID;
137 X9_62_CURVE *curve;
138 ASN1_OCTET_STRING *base;
139 ASN1_INTEGER *order;
140 ASN1_INTEGER *cofactor;
141} /* ECPARAMETERS */ ;
142
143struct ecpk_parameters_st {
144 int type;
145 union {
146 ASN1_OBJECT *named_curve;
147 ECPARAMETERS *parameters;
148 ASN1_NULL *implicitlyCA;
149 } value;
150} /* ECPKPARAMETERS */ ;
151
152/* SEC1 ECPrivateKey */
153typedef struct ec_privatekey_st {
154 int32_t version;
155 ASN1_OCTET_STRING *privateKey;
156 ECPKPARAMETERS *parameters;
157 ASN1_BIT_STRING *publicKey;
158} EC_PRIVATEKEY;
159
160/* the OpenSSL ASN.1 definitions */
161ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
162 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
163 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
164 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
165} static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
166
167DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
168IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
169
170ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
171
172ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
173 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
174 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
175 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
176} ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
177
178ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
179 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
180 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
181 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
182} static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
183
184DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
185IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
186
187ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
188
189ASN1_ADB(X9_62_FIELDID) = {
190 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
191 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
192} ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
193
194ASN1_SEQUENCE(X9_62_FIELDID) = {
195 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
196 ASN1_ADB_OBJECT(X9_62_FIELDID)
197} static_ASN1_SEQUENCE_END(X9_62_FIELDID)
198
199ASN1_SEQUENCE(X9_62_CURVE) = {
200 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
201 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
202 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
203} static_ASN1_SEQUENCE_END(X9_62_CURVE)
204
205ASN1_SEQUENCE(ECPARAMETERS) = {
206 ASN1_EMBED(ECPARAMETERS, version, INT32),
207 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
208 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
209 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
210 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
211 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
212} ASN1_SEQUENCE_END(ECPARAMETERS)
213
214DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
215IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
216
217ASN1_CHOICE(ECPKPARAMETERS) = {
218 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
219 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
220 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
221} ASN1_CHOICE_END(ECPKPARAMETERS)
222
223DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS)
224DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS)
225IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS)
226
227ASN1_SEQUENCE(EC_PRIVATEKEY) = {
228 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
229 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
230 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
231 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
232} static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
233
234DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY)
235DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY)
236IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY)
237
238/* some declarations of internal function */
239
240/* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
241static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
242/* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
243static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
244
245/* the function definitions */
246
247static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
248{
249 int ok = 0, nid;
250 BIGNUM *tmp = NULL;
251
252 if (group == NULL || field == NULL)
253 return 0;
254
255 /* clear the old values (if necessary) */
256 ASN1_OBJECT_free(field->fieldType);
257 ASN1_TYPE_free(field->p.other);
258
259 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
260 /* set OID for the field */
261 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
262 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
263 goto err;
264 }
265
266 if (nid == NID_X9_62_prime_field) {
267 if ((tmp = BN_new()) == NULL) {
268 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
269 goto err;
270 }
271 /* the parameters are specified by the prime number p */
272 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
273 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
274 goto err;
275 }
276 /* set the prime number */
277 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
278 if (field->p.prime == NULL) {
279 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
280 goto err;
281 }
282 } else if (nid == NID_X9_62_characteristic_two_field)
283#ifdef OPENSSL_NO_EC2M
284 {
285 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
286 goto err;
287 }
288#else
289 {
290 int field_type;
291 X9_62_CHARACTERISTIC_TWO *char_two;
292
293 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
294 char_two = field->p.char_two;
295
296 if (char_two == NULL) {
297 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
298 goto err;
299 }
300
301 char_two->m = (long)EC_GROUP_get_degree(group);
302
303 field_type = EC_GROUP_get_basis_type(group);
304
305 if (field_type == 0) {
306 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
307 goto err;
308 }
309 /* set base type OID */
310 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
311 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
312 goto err;
313 }
314
315 if (field_type == NID_X9_62_tpBasis) {
316 unsigned int k;
317
318 if (!EC_GROUP_get_trinomial_basis(group, &k))
319 goto err;
320
321 char_two->p.tpBasis = ASN1_INTEGER_new();
322 if (char_two->p.tpBasis == NULL) {
323 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
324 goto err;
325 }
326 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
327 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
328 goto err;
329 }
330 } else if (field_type == NID_X9_62_ppBasis) {
331 unsigned int k1, k2, k3;
332
333 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
334 goto err;
335
336 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
337 if (char_two->p.ppBasis == NULL) {
338 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
339 goto err;
340 }
341
342 /* set k? values */
343 char_two->p.ppBasis->k1 = (long)k1;
344 char_two->p.ppBasis->k2 = (long)k2;
345 char_two->p.ppBasis->k3 = (long)k3;
346 } else { /* field_type == NID_X9_62_onBasis */
347
348 /* for ONB the parameters are (asn1) NULL */
349 char_two->p.onBasis = ASN1_NULL_new();
350 if (char_two->p.onBasis == NULL) {
351 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
352 goto err;
353 }
354 }
355 }
356#endif
357 else {
358 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
359 goto err;
360 }
361
362 ok = 1;
363
364 err:
365 BN_free(tmp);
366 return ok;
367}
368
369static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
370{
371 int ok = 0;
372 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
373 unsigned char *a_buf = NULL, *b_buf = NULL;
374 size_t len;
375
376 if (!group || !curve || !curve->a || !curve->b)
377 return 0;
378
379 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
380 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
381 goto err;
382 }
383
384 /* get a and b */
385 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
386 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
387 goto err;
388 }
389
390 /*
391 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
392 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
393 * definition of how to encode the field elements.
394 */
395 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
396 if ((a_buf = OPENSSL_malloc(len)) == NULL
397 || (b_buf = OPENSSL_malloc(len)) == NULL) {
398 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
399 goto err;
400 }
401 if (BN_bn2binpad(tmp_1, a_buf, len) < 0
402 || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
403 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
404 goto err;
405 }
406
407 /* set a and b */
408 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
409 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
410 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
411 goto err;
412 }
413
414 /* set the seed (optional) */
415 if (group->seed) {
416 if (!curve->seed)
417 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
418 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
419 goto err;
420 }
421 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
422 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
423 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
424 (int)group->seed_len)) {
425 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
426 goto err;
427 }
428 } else {
429 ASN1_BIT_STRING_free(curve->seed);
430 curve->seed = NULL;
431 }
432
433 ok = 1;
434
435 err:
436 OPENSSL_free(a_buf);
437 OPENSSL_free(b_buf);
438 BN_free(tmp_1);
439 BN_free(tmp_2);
440 return ok;
441}
442
443ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
444 ECPARAMETERS *params)
445{
446 size_t len = 0;
447 ECPARAMETERS *ret = NULL;
448 const BIGNUM *tmp;
449 unsigned char *buffer = NULL;
450 const EC_POINT *point = NULL;
451 point_conversion_form_t form;
452 ASN1_INTEGER *orig;
453
454 if (params == NULL) {
455 if ((ret = ECPARAMETERS_new()) == NULL) {
456 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
457 goto err;
458 }
459 } else
460 ret = params;
461
462 /* set the version (always one) */
463 ret->version = (long)0x1;
464
465 /* set the fieldID */
466 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
467 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
468 goto err;
469 }
470
471 /* set the curve */
472 if (!ec_asn1_group2curve(group, ret->curve)) {
473 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
474 goto err;
475 }
476
477 /* set the base point */
478 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
479 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
480 goto err;
481 }
482
483 form = EC_GROUP_get_point_conversion_form(group);
484
485 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
486 if (len == 0) {
487 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
488 goto err;
489 }
490 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
491 OPENSSL_free(buffer);
492 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
493 goto err;
494 }
495 ASN1_STRING_set0(ret->base, buffer, len);
496
497 /* set the order */
498 tmp = EC_GROUP_get0_order(group);
499 if (tmp == NULL) {
500 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
501 goto err;
502 }
503 ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
504 if (ret->order == NULL) {
505 ret->order = orig;
506 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
507 goto err;
508 }
509
510 /* set the cofactor (optional) */
511 tmp = EC_GROUP_get0_cofactor(group);
512 if (tmp != NULL) {
513 ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
514 if (ret->cofactor == NULL) {
515 ret->cofactor = orig;
516 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
517 goto err;
518 }
519 }
520
521 return ret;
522
523 err:
524 if (params == NULL)
525 ECPARAMETERS_free(ret);
526 return NULL;
527}
528
529ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
530 ECPKPARAMETERS *params)
531{
532 int ok = 1, tmp;
533 ECPKPARAMETERS *ret = params;
534
535 if (ret == NULL) {
536 if ((ret = ECPKPARAMETERS_new()) == NULL) {
537 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
538 return NULL;
539 }
540 } else {
541 if (ret->type == 0)
542 ASN1_OBJECT_free(ret->value.named_curve);
543 else if (ret->type == 1 && ret->value.parameters)
544 ECPARAMETERS_free(ret->value.parameters);
545 }
546
547 if (EC_GROUP_get_asn1_flag(group)) {
548 /*
549 * use the asn1 OID to describe the elliptic curve parameters
550 */
551 tmp = EC_GROUP_get_curve_name(group);
552 if (tmp) {
553 ret->type = 0;
554 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
555 ok = 0;
556 } else
557 /* we don't know the nid => ERROR */
558 ok = 0;
559 } else {
560 /* use the ECPARAMETERS structure */
561 ret->type = 1;
562 if ((ret->value.parameters =
563 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
564 ok = 0;
565 }
566
567 if (!ok) {
568 ECPKPARAMETERS_free(ret);
569 return NULL;
570 }
571 return ret;
572}
573
574EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
575{
576 int ok = 0, tmp;
577 EC_GROUP *ret = NULL, *dup = NULL;
578 BIGNUM *p = NULL, *a = NULL, *b = NULL;
579 EC_POINT *point = NULL;
580 long field_bits;
581 int curve_name = NID_undef;
582 BN_CTX *ctx = NULL;
583
584 if (params->fieldID == NULL
585 || params->fieldID->fieldType == NULL
586 || params->fieldID->p.ptr == NULL) {
587 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
588 goto err;
589 }
590
591 /*
592 * Now extract the curve parameters a and b. Note that, although SEC 1
593 * specifies the length of their encodings, historical versions of OpenSSL
594 * encoded them incorrectly, so we must accept any length for backwards
595 * compatibility.
596 */
597 if (params->curve == NULL
598 || params->curve->a == NULL || params->curve->a->data == NULL
599 || params->curve->b == NULL || params->curve->b->data == NULL) {
600 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
601 goto err;
602 }
603 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
604 if (a == NULL) {
605 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
606 goto err;
607 }
608 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
609 if (b == NULL) {
610 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
611 goto err;
612 }
613
614 /* get the field parameters */
615 tmp = OBJ_obj2nid(params->fieldID->fieldType);
616 if (tmp == NID_X9_62_characteristic_two_field)
617#ifdef OPENSSL_NO_EC2M
618 {
619 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
620 goto err;
621 }
622#else
623 {
624 X9_62_CHARACTERISTIC_TWO *char_two;
625
626 char_two = params->fieldID->p.char_two;
627
628 field_bits = char_two->m;
629 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
630 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
631 goto err;
632 }
633
634 if ((p = BN_new()) == NULL) {
635 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
636 goto err;
637 }
638
639 /* get the base type */
640 tmp = OBJ_obj2nid(char_two->type);
641
642 if (tmp == NID_X9_62_tpBasis) {
643 long tmp_long;
644
645 if (!char_two->p.tpBasis) {
646 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
647 goto err;
648 }
649
650 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
651
652 if (!(char_two->m > tmp_long && tmp_long > 0)) {
653 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
654 EC_R_INVALID_TRINOMIAL_BASIS);
655 goto err;
656 }
657
658 /* create the polynomial */
659 if (!BN_set_bit(p, (int)char_two->m))
660 goto err;
661 if (!BN_set_bit(p, (int)tmp_long))
662 goto err;
663 if (!BN_set_bit(p, 0))
664 goto err;
665 } else if (tmp == NID_X9_62_ppBasis) {
666 X9_62_PENTANOMIAL *penta;
667
668 penta = char_two->p.ppBasis;
669 if (penta == NULL) {
670 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
671 goto err;
672 }
673
674 if (!
675 (char_two->m > penta->k3 && penta->k3 > penta->k2
676 && penta->k2 > penta->k1 && penta->k1 > 0)) {
677 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
678 EC_R_INVALID_PENTANOMIAL_BASIS);
679 goto err;
680 }
681
682 /* create the polynomial */
683 if (!BN_set_bit(p, (int)char_two->m))
684 goto err;
685 if (!BN_set_bit(p, (int)penta->k1))
686 goto err;
687 if (!BN_set_bit(p, (int)penta->k2))
688 goto err;
689 if (!BN_set_bit(p, (int)penta->k3))
690 goto err;
691 if (!BN_set_bit(p, 0))
692 goto err;
693 } else if (tmp == NID_X9_62_onBasis) {
694 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
695 goto err;
696 } else { /* error */
697
698 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
699 goto err;
700 }
701
702 /* create the EC_GROUP structure */
703 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
704 }
705#endif
706 else if (tmp == NID_X9_62_prime_field) {
707 /* we have a curve over a prime field */
708 /* extract the prime number */
709 if (params->fieldID->p.prime == NULL) {
710 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
711 goto err;
712 }
713 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
714 if (p == NULL) {
715 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
716 goto err;
717 }
718
719 if (BN_is_negative(p) || BN_is_zero(p)) {
720 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
721 goto err;
722 }
723
724 field_bits = BN_num_bits(p);
725 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
726 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
727 goto err;
728 }
729
730 /* create the EC_GROUP structure */
731 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
732 } else {
733 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
734 goto err;
735 }
736
737 if (ret == NULL) {
738 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
739 goto err;
740 }
741
742 /* extract seed (optional) */
743 if (params->curve->seed != NULL) {
744 OPENSSL_free(ret->seed);
745 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
746 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
747 goto err;
748 }
749 memcpy(ret->seed, params->curve->seed->data,
750 params->curve->seed->length);
751 ret->seed_len = params->curve->seed->length;
752 }
753
754 if (params->order == NULL
755 || params->base == NULL
756 || params->base->data == NULL) {
757 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
758 goto err;
759 }
760
761 if ((point = EC_POINT_new(ret)) == NULL)
762 goto err;
763
764 /* set the point conversion form */
765 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
766 (params->base->data[0] & ~0x01));
767
768 /* extract the ec point */
769 if (!EC_POINT_oct2point(ret, point, params->base->data,
770 params->base->length, NULL)) {
771 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
772 goto err;
773 }
774
775 /* extract the order */
776 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
777 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
778 goto err;
779 }
780 if (BN_is_negative(a) || BN_is_zero(a)) {
781 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
782 goto err;
783 }
784 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
785 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
786 goto err;
787 }
788
789 /* extract the cofactor (optional) */
790 if (params->cofactor == NULL) {
791 BN_free(b);
792 b = NULL;
793 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
794 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
795 goto err;
796 }
797 /* set the generator, order and cofactor (if present) */
798 if (!EC_GROUP_set_generator(ret, point, a, b)) {
799 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
800 goto err;
801 }
802
803 /*
804 * Check if the explicit parameters group just created matches one of the
805 * built-in curves.
806 *
807 * We create a copy of the group just built, so that we can remove optional
808 * fields for the lookup: we do this to avoid the possibility that one of
809 * the optional parameters is used to force the library into using a less
810 * performant and less secure EC_METHOD instead of the specialized one.
811 * In any case, `seed` is not really used in any computation, while a
812 * cofactor different from the one in the built-in table is just
813 * mathematically wrong anyway and should not be used.
814 */
815 if ((ctx = BN_CTX_new()) == NULL) {
816 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
817 goto err;
818 }
819 if ((dup = EC_GROUP_dup(ret)) == NULL
820 || EC_GROUP_set_seed(dup, NULL, 0) != 1
821 || !EC_GROUP_set_generator(dup, point, a, NULL)) {
822 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
823 goto err;
824 }
825 if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
826 /*
827 * The input explicit parameters successfully matched one of the
828 * built-in curves: often for built-in curves we have specialized
829 * methods with better performance and hardening.
830 *
831 * In this case we replace the `EC_GROUP` created through explicit
832 * parameters with one created from a named group.
833 */
834 EC_GROUP *named_group = NULL;
835
836#ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
837 /*
838 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
839 * the same curve, we prefer the SECP nid when matching explicit
840 * parameters as that is associated with a specialized EC_METHOD.
841 */
842 if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
843 curve_name = NID_secp224r1;
844#endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
845
846 if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
847 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
848 goto err;
849 }
850 EC_GROUP_free(ret);
851 ret = named_group;
852
853 /*
854 * Set the flag so that EC_GROUPs created from explicit parameters are
855 * serialized using explicit parameters by default.
856 */
857 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
858
859 /*
860 * If the input params do not contain the optional seed field we make
861 * sure it is not added to the returned group.
862 *
863 * The seed field is not really used inside libcrypto anyway, and
864 * adding it to parsed explicit parameter keys would alter their DER
865 * encoding output (because of the extra field) which could impact
866 * applications fingerprinting keys by their DER encoding.
867 */
868 if (params->curve->seed == NULL) {
869 if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
870 goto err;
871 }
872 }
873
874 ok = 1;
875
876 err:
877 if (!ok) {
878 EC_GROUP_free(ret);
879 ret = NULL;
880 }
881 EC_GROUP_free(dup);
882
883 BN_free(p);
884 BN_free(a);
885 BN_free(b);
886 EC_POINT_free(point);
887
888 BN_CTX_free(ctx);
889
890 return ret;
891}
892
893EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
894{
895 EC_GROUP *ret = NULL;
896 int tmp = 0;
897
898 if (params == NULL) {
899 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
900 return NULL;
901 }
902
903 if (params->type == 0) { /* the curve is given by an OID */
904 tmp = OBJ_obj2nid(params->value.named_curve);
905 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
906 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
907 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
908 return NULL;
909 }
910 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
911 } else if (params->type == 1) { /* the parameters are given by a
912 * ECPARAMETERS structure */
913 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
914 if (!ret) {
915 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
916 return NULL;
917 }
918 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
919 } else if (params->type == 2) { /* implicitlyCA */
920 return NULL;
921 } else {
922 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
923 return NULL;
924 }
925
926 return ret;
927}
928
929/* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
930
931EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
932{
933 EC_GROUP *group = NULL;
934 ECPKPARAMETERS *params = NULL;
935 const unsigned char *p = *in;
936
937 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
938 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
939 ECPKPARAMETERS_free(params);
940 return NULL;
941 }
942
943 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
944 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
945 ECPKPARAMETERS_free(params);
946 return NULL;
947 }
948
949 if (a) {
950 EC_GROUP_free(*a);
951 *a = group;
952 }
953
954 ECPKPARAMETERS_free(params);
955 *in = p;
956 return group;
957}
958
959int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
960{
961 int ret = 0;
962 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
963 if (tmp == NULL) {
964 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
965 return 0;
966 }
967 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
968 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
969 ECPKPARAMETERS_free(tmp);
970 return 0;
971 }
972 ECPKPARAMETERS_free(tmp);
973 return ret;
974}
975
976/* some EC_KEY functions */
977
978EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
979{
980 EC_KEY *ret = NULL;
981 EC_PRIVATEKEY *priv_key = NULL;
982 const unsigned char *p = *in;
983
984 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
985 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
986 return NULL;
987 }
988
989 if (a == NULL || *a == NULL) {
990 if ((ret = EC_KEY_new()) == NULL) {
991 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
992 goto err;
993 }
994 } else
995 ret = *a;
996
997 if (priv_key->parameters) {
998 EC_GROUP_free(ret->group);
999 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
1000 }
1001
1002 if (ret->group == NULL) {
1003 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1004 goto err;
1005 }
1006
1007 ret->version = priv_key->version;
1008
1009 if (priv_key->privateKey) {
1010 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
1011 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
1012 ASN1_STRING_length(pkey)) == 0)
1013 goto err;
1014 } else {
1015 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1016 goto err;
1017 }
1018
1019 EC_POINT_clear_free(ret->pub_key);
1020 ret->pub_key = EC_POINT_new(ret->group);
1021 if (ret->pub_key == NULL) {
1022 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1023 goto err;
1024 }
1025
1026 if (priv_key->publicKey) {
1027 const unsigned char *pub_oct;
1028 int pub_oct_len;
1029
1030 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
1031 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1032 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
1033 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1034 goto err;
1035 }
1036 } else {
1037 if (ret->group->meth->keygenpub == NULL
1038 || ret->group->meth->keygenpub(ret) == 0)
1039 goto err;
1040 /* Remember the original private-key-only encoding. */
1041 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1042 }
1043
1044 if (a)
1045 *a = ret;
1046 EC_PRIVATEKEY_free(priv_key);
1047 *in = p;
1048 return ret;
1049
1050 err:
1051 if (a == NULL || *a != ret)
1052 EC_KEY_free(ret);
1053 EC_PRIVATEKEY_free(priv_key);
1054 return NULL;
1055}
1056
1057int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out)
1058{
1059 int ret = 0, ok = 0;
1060 unsigned char *priv= NULL, *pub= NULL;
1061 size_t privlen = 0, publen = 0;
1062
1063 EC_PRIVATEKEY *priv_key = NULL;
1064
1065 if (a == NULL || a->group == NULL ||
1066 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1067 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1068 goto err;
1069 }
1070
1071 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1072 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1073 goto err;
1074 }
1075
1076 priv_key->version = a->version;
1077
1078 privlen = EC_KEY_priv2buf(a, &priv);
1079
1080 if (privlen == 0) {
1081 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1082 goto err;
1083 }
1084
1085 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1086 priv = NULL;
1087
1088 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1089 if ((priv_key->parameters =
1090 EC_GROUP_get_ecpkparameters(a->group,
1091 priv_key->parameters)) == NULL) {
1092 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1093 goto err;
1094 }
1095 }
1096
1097 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1098 priv_key->publicKey = ASN1_BIT_STRING_new();
1099 if (priv_key->publicKey == NULL) {
1100 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1101 goto err;
1102 }
1103
1104 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1105
1106 if (publen == 0) {
1107 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1108 goto err;
1109 }
1110
1111 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1112 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1113 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1114 pub = NULL;
1115 }
1116
1117 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1118 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1119 goto err;
1120 }
1121 ok = 1;
1122 err:
1123 OPENSSL_clear_free(priv, privlen);
1124 OPENSSL_free(pub);
1125 EC_PRIVATEKEY_free(priv_key);
1126 return (ok ? ret : 0);
1127}
1128
1129int i2d_ECParameters(const EC_KEY *a, unsigned char **out)
1130{
1131 if (a == NULL) {
1132 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1133 return 0;
1134 }
1135 return i2d_ECPKParameters(a->group, out);
1136}
1137
1138EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1139{
1140 EC_KEY *ret;
1141
1142 if (in == NULL || *in == NULL) {
1143 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1144 return NULL;
1145 }
1146
1147 if (a == NULL || *a == NULL) {
1148 if ((ret = EC_KEY_new()) == NULL) {
1149 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1150 return NULL;
1151 }
1152 } else
1153 ret = *a;
1154
1155 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1156 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1157 if (a == NULL || *a != ret)
1158 EC_KEY_free(ret);
1159 return NULL;
1160 }
1161
1162 if (a)
1163 *a = ret;
1164
1165 return ret;
1166}
1167
1168EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1169{
1170 EC_KEY *ret = NULL;
1171
1172 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1173 /*
1174 * sorry, but a EC_GROUP-structure is necessary to set the public key
1175 */
1176 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1177 return 0;
1178 }
1179 ret = *a;
1180 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1181 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1182 return 0;
1183 }
1184 *in += len;
1185 return ret;
1186}
1187
1188int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1189{
1190 size_t buf_len = 0;
1191 int new_buffer = 0;
1192
1193 if (a == NULL) {
1194 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1195 return 0;
1196 }
1197
1198 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1199 a->conv_form, NULL, 0, NULL);
1200
1201 if (out == NULL || buf_len == 0)
1202 /* out == NULL => just return the length of the octet string */
1203 return buf_len;
1204
1205 if (*out == NULL) {
1206 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1207 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1208 return 0;
1209 }
1210 new_buffer = 1;
1211 }
1212 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1213 *out, buf_len, NULL)) {
1214 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1215 if (new_buffer) {
1216 OPENSSL_free(*out);
1217 *out = NULL;
1218 }
1219 return 0;
1220 }
1221 if (!new_buffer)
1222 *out += buf_len;
1223 return buf_len;
1224}
1225
1226DECLARE_ASN1_FUNCTIONS(ECDSA_SIG)
1227DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG)
1228
1229#endif /* FIPS_MODE */
1230
1231ECDSA_SIG *ECDSA_SIG_new(void)
1232{
1233 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1234 if (sig == NULL)
1235 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1236 return sig;
1237}
1238
1239void ECDSA_SIG_free(ECDSA_SIG *sig)
1240{
1241 if (sig == NULL)
1242 return;
1243 BN_clear_free(sig->r);
1244 BN_clear_free(sig->s);
1245 OPENSSL_free(sig);
1246}
1247
1248ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len)
1249{
1250 ECDSA_SIG *sig;
1251
1252 if (len < 0)
1253 return NULL;
1254 if (psig != NULL && *psig != NULL) {
1255 sig = *psig;
1256 } else {
1257 sig = ECDSA_SIG_new();
1258 if (sig == NULL)
1259 return NULL;
1260 }
1261 if (sig->r == NULL)
1262 sig->r = BN_new();
1263 if (sig->s == NULL)
1264 sig->s = BN_new();
1265 if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) {
1266 if (psig == NULL || *psig == NULL)
1267 ECDSA_SIG_free(sig);
1268 return NULL;
1269 }
1270 if (psig != NULL && *psig == NULL)
1271 *psig = sig;
1272 return sig;
1273}
1274
1275int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout)
1276{
1277 BUF_MEM *buf = NULL;
1278 size_t encoded_len;
1279 WPACKET pkt;
1280
1281 if (ppout == NULL) {
1282 if (!WPACKET_init_null(&pkt, 0))
1283 return -1;
1284 } else if (*ppout == NULL) {
1285 if ((buf = BUF_MEM_new()) == NULL
1286 || !WPACKET_init_len(&pkt, buf, 0)) {
1287 BUF_MEM_free(buf);
1288 return -1;
1289 }
1290 } else {
1291 if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0))
1292 return -1;
1293 }
1294
1295 if (!encode_der_dsa_sig(&pkt, sig->r, sig->s)
1296 || !WPACKET_get_total_written(&pkt, &encoded_len)
1297 || !WPACKET_finish(&pkt)) {
1298 BUF_MEM_free(buf);
1299 WPACKET_cleanup(&pkt);
1300 return -1;
1301 }
1302
1303 if (ppout != NULL) {
1304 if (*ppout == NULL) {
1305 *ppout = (unsigned char *)buf->data;
1306 buf->data = NULL;
1307 BUF_MEM_free(buf);
1308 } else {
1309 *ppout += encoded_len;
1310 }
1311 }
1312
1313 return (int)encoded_len;
1314}
1315
1316void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1317{
1318 if (pr != NULL)
1319 *pr = sig->r;
1320 if (ps != NULL)
1321 *ps = sig->s;
1322}
1323
1324const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1325{
1326 return sig->r;
1327}
1328
1329const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1330{
1331 return sig->s;
1332}
1333
1334int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1335{
1336 if (r == NULL || s == NULL)
1337 return 0;
1338 BN_clear_free(sig->r);
1339 BN_clear_free(sig->s);
1340 sig->r = r;
1341 sig->s = s;
1342 return 1;
1343}
1344
1345#ifndef FIPS_MODE
1346int ECDSA_size(const EC_KEY *r)
1347{
1348 int ret, i;
1349 ASN1_INTEGER bs;
1350 unsigned char buf[4];
1351 const EC_GROUP *group;
1352
1353 if (r == NULL)
1354 return 0;
1355 group = EC_KEY_get0_group(r);
1356 if (group == NULL)
1357 return 0;
1358
1359 i = EC_GROUP_order_bits(group);
1360 if (i == 0)
1361 return 0;
1362 bs.length = (i + 7) / 8;
1363 bs.data = buf;
1364 bs.type = V_ASN1_INTEGER;
1365 /* If the top bit is set the asn1 encoding is 1 larger. */
1366 buf[0] = 0xff;
1367
1368 i = i2d_ASN1_INTEGER(&bs, NULL);
1369 i += i; /* r and s */
1370 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1371 return ret;
1372}
1373#endif
1374