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Following the license change, modify the boilerplates in crypto/ec/
[thirdparty/openssl.git] / crypto / ec / ec_asn1.c
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_lcl.h"
12 #include <openssl/err.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
15 #include "internal/nelem.h"
16
17 int EC_GROUP_get_basis_type(const EC_GROUP *group)
18 {
19 int i;
20
21 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
22 NID_X9_62_characteristic_two_field)
23 /* everything else is currently not supported */
24 return 0;
25
26 /* Find the last non-zero element of group->poly[] */
27 for (i = 0;
28 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
29 i++)
30 continue;
31
32 if (i == 4)
33 return NID_X9_62_ppBasis;
34 else if (i == 2)
35 return NID_X9_62_tpBasis;
36 else
37 /* everything else is currently not supported */
38 return 0;
39 }
40
41 #ifndef OPENSSL_NO_EC2M
42 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
43 {
44 if (group == NULL)
45 return 0;
46
47 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
48 NID_X9_62_characteristic_two_field
49 || !((group->poly[0] != 0) && (group->poly[1] != 0)
50 && (group->poly[2] == 0))) {
51 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
52 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
53 return 0;
54 }
55
56 if (k)
57 *k = group->poly[1];
58
59 return 1;
60 }
61
62 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
63 unsigned int *k2, unsigned int *k3)
64 {
65 if (group == NULL)
66 return 0;
67
68 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
69 NID_X9_62_characteristic_two_field
70 || !((group->poly[0] != 0) && (group->poly[1] != 0)
71 && (group->poly[2] != 0) && (group->poly[3] != 0)
72 && (group->poly[4] == 0))) {
73 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
74 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
75 return 0;
76 }
77
78 if (k1)
79 *k1 = group->poly[3];
80 if (k2)
81 *k2 = group->poly[2];
82 if (k3)
83 *k3 = group->poly[1];
84
85 return 1;
86 }
87 #endif
88
89 /* some structures needed for the asn1 encoding */
90 typedef struct x9_62_pentanomial_st {
91 int32_t k1;
92 int32_t k2;
93 int32_t k3;
94 } X9_62_PENTANOMIAL;
95
96 typedef struct x9_62_characteristic_two_st {
97 int32_t m;
98 ASN1_OBJECT *type;
99 union {
100 char *ptr;
101 /* NID_X9_62_onBasis */
102 ASN1_NULL *onBasis;
103 /* NID_X9_62_tpBasis */
104 ASN1_INTEGER *tpBasis;
105 /* NID_X9_62_ppBasis */
106 X9_62_PENTANOMIAL *ppBasis;
107 /* anything else */
108 ASN1_TYPE *other;
109 } p;
110 } X9_62_CHARACTERISTIC_TWO;
111
112 typedef struct x9_62_fieldid_st {
113 ASN1_OBJECT *fieldType;
114 union {
115 char *ptr;
116 /* NID_X9_62_prime_field */
117 ASN1_INTEGER *prime;
118 /* NID_X9_62_characteristic_two_field */
119 X9_62_CHARACTERISTIC_TWO *char_two;
120 /* anything else */
121 ASN1_TYPE *other;
122 } p;
123 } X9_62_FIELDID;
124
125 typedef struct x9_62_curve_st {
126 ASN1_OCTET_STRING *a;
127 ASN1_OCTET_STRING *b;
128 ASN1_BIT_STRING *seed;
129 } X9_62_CURVE;
130
131 struct ec_parameters_st {
132 int32_t version;
133 X9_62_FIELDID *fieldID;
134 X9_62_CURVE *curve;
135 ASN1_OCTET_STRING *base;
136 ASN1_INTEGER *order;
137 ASN1_INTEGER *cofactor;
138 } /* ECPARAMETERS */ ;
139
140 struct ecpk_parameters_st {
141 int type;
142 union {
143 ASN1_OBJECT *named_curve;
144 ECPARAMETERS *parameters;
145 ASN1_NULL *implicitlyCA;
146 } value;
147 } /* ECPKPARAMETERS */ ;
148
149 /* SEC1 ECPrivateKey */
150 typedef struct ec_privatekey_st {
151 int32_t version;
152 ASN1_OCTET_STRING *privateKey;
153 ECPKPARAMETERS *parameters;
154 ASN1_BIT_STRING *publicKey;
155 } EC_PRIVATEKEY;
156
157 /* the OpenSSL ASN.1 definitions */
158 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
159 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
160 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
161 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
162 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
163
164 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
165 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
166
167 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
168
169 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
170 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
171 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
172 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
173 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
174
175 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
176 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
177 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
178 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
179 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
180
181 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
182 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
183
184 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
185
186 ASN1_ADB(X9_62_FIELDID) = {
187 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
188 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
189 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
190
191 ASN1_SEQUENCE(X9_62_FIELDID) = {
192 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
193 ASN1_ADB_OBJECT(X9_62_FIELDID)
194 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
195
196 ASN1_SEQUENCE(X9_62_CURVE) = {
197 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
198 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
199 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
200 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
201
202 ASN1_SEQUENCE(ECPARAMETERS) = {
203 ASN1_EMBED(ECPARAMETERS, version, INT32),
204 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
205 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
206 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
207 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
208 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
209 } ASN1_SEQUENCE_END(ECPARAMETERS)
210
211 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
212 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
213
214 ASN1_CHOICE(ECPKPARAMETERS) = {
215 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
216 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
217 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
218 } ASN1_CHOICE_END(ECPKPARAMETERS)
219
220 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
221 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
222 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
223
224 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
225 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
226 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
227 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
228 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
229 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
230
231 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
232 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
233 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
234
235 /* some declarations of internal function */
236
237 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
238 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
239 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
240 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
241
242 /* the function definitions */
243
244 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
245 {
246 int ok = 0, nid;
247 BIGNUM *tmp = NULL;
248
249 if (group == NULL || field == NULL)
250 return 0;
251
252 /* clear the old values (if necessary) */
253 ASN1_OBJECT_free(field->fieldType);
254 ASN1_TYPE_free(field->p.other);
255
256 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
257 /* set OID for the field */
258 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
259 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
260 goto err;
261 }
262
263 if (nid == NID_X9_62_prime_field) {
264 if ((tmp = BN_new()) == NULL) {
265 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
266 goto err;
267 }
268 /* the parameters are specified by the prime number p */
269 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
270 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
271 goto err;
272 }
273 /* set the prime number */
274 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
275 if (field->p.prime == NULL) {
276 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
277 goto err;
278 }
279 } else if (nid == NID_X9_62_characteristic_two_field)
280 #ifdef OPENSSL_NO_EC2M
281 {
282 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
283 goto err;
284 }
285 #else
286 {
287 int field_type;
288 X9_62_CHARACTERISTIC_TWO *char_two;
289
290 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
291 char_two = field->p.char_two;
292
293 if (char_two == NULL) {
294 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
295 goto err;
296 }
297
298 char_two->m = (long)EC_GROUP_get_degree(group);
299
300 field_type = EC_GROUP_get_basis_type(group);
301
302 if (field_type == 0) {
303 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
304 goto err;
305 }
306 /* set base type OID */
307 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
308 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
309 goto err;
310 }
311
312 if (field_type == NID_X9_62_tpBasis) {
313 unsigned int k;
314
315 if (!EC_GROUP_get_trinomial_basis(group, &k))
316 goto err;
317
318 char_two->p.tpBasis = ASN1_INTEGER_new();
319 if (char_two->p.tpBasis == NULL) {
320 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
321 goto err;
322 }
323 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
324 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
325 goto err;
326 }
327 } else if (field_type == NID_X9_62_ppBasis) {
328 unsigned int k1, k2, k3;
329
330 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
331 goto err;
332
333 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
334 if (char_two->p.ppBasis == NULL) {
335 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
336 goto err;
337 }
338
339 /* set k? values */
340 char_two->p.ppBasis->k1 = (long)k1;
341 char_two->p.ppBasis->k2 = (long)k2;
342 char_two->p.ppBasis->k3 = (long)k3;
343 } else { /* field_type == NID_X9_62_onBasis */
344
345 /* for ONB the parameters are (asn1) NULL */
346 char_two->p.onBasis = ASN1_NULL_new();
347 if (char_two->p.onBasis == NULL) {
348 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
349 goto err;
350 }
351 }
352 }
353 #endif
354 else {
355 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
356 goto err;
357 }
358
359 ok = 1;
360
361 err:
362 BN_free(tmp);
363 return ok;
364 }
365
366 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
367 {
368 int ok = 0;
369 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
370 unsigned char *a_buf = NULL, *b_buf = NULL;
371 size_t len;
372
373 if (!group || !curve || !curve->a || !curve->b)
374 return 0;
375
376 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
377 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
378 goto err;
379 }
380
381 /* get a and b */
382 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
383 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
384 goto err;
385 }
386
387 /*
388 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
389 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
390 * definition of how to encode the field elements.
391 */
392 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
393 if ((a_buf = OPENSSL_malloc(len)) == NULL
394 || (b_buf = OPENSSL_malloc(len)) == NULL) {
395 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
396 goto err;
397 }
398 if (BN_bn2binpad(tmp_1, a_buf, len) < 0
399 || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
400 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
401 goto err;
402 }
403
404 /* set a and b */
405 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
406 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
407 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
408 goto err;
409 }
410
411 /* set the seed (optional) */
412 if (group->seed) {
413 if (!curve->seed)
414 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
415 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
416 goto err;
417 }
418 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
419 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
420 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
421 (int)group->seed_len)) {
422 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
423 goto err;
424 }
425 } else {
426 ASN1_BIT_STRING_free(curve->seed);
427 curve->seed = NULL;
428 }
429
430 ok = 1;
431
432 err:
433 OPENSSL_free(a_buf);
434 OPENSSL_free(b_buf);
435 BN_free(tmp_1);
436 BN_free(tmp_2);
437 return ok;
438 }
439
440 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
441 ECPARAMETERS *params)
442 {
443 size_t len = 0;
444 ECPARAMETERS *ret = NULL;
445 const BIGNUM *tmp;
446 unsigned char *buffer = NULL;
447 const EC_POINT *point = NULL;
448 point_conversion_form_t form;
449
450 if (params == NULL) {
451 if ((ret = ECPARAMETERS_new()) == NULL) {
452 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
453 goto err;
454 }
455 } else
456 ret = params;
457
458 /* set the version (always one) */
459 ret->version = (long)0x1;
460
461 /* set the fieldID */
462 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
463 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
464 goto err;
465 }
466
467 /* set the curve */
468 if (!ec_asn1_group2curve(group, ret->curve)) {
469 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
470 goto err;
471 }
472
473 /* set the base point */
474 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
475 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
476 goto err;
477 }
478
479 form = EC_GROUP_get_point_conversion_form(group);
480
481 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
482 if (len == 0) {
483 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
484 goto err;
485 }
486 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
487 OPENSSL_free(buffer);
488 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
489 goto err;
490 }
491 ASN1_STRING_set0(ret->base, buffer, len);
492
493 /* set the order */
494 tmp = EC_GROUP_get0_order(group);
495 if (tmp == NULL) {
496 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
497 goto err;
498 }
499 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
500 if (ret->order == NULL) {
501 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
502 goto err;
503 }
504
505 /* set the cofactor (optional) */
506 tmp = EC_GROUP_get0_cofactor(group);
507 if (tmp != NULL) {
508 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
509 if (ret->cofactor == NULL) {
510 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
511 goto err;
512 }
513 }
514
515 return ret;
516
517 err:
518 if (params == NULL)
519 ECPARAMETERS_free(ret);
520 return NULL;
521 }
522
523 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
524 ECPKPARAMETERS *params)
525 {
526 int ok = 1, tmp;
527 ECPKPARAMETERS *ret = params;
528
529 if (ret == NULL) {
530 if ((ret = ECPKPARAMETERS_new()) == NULL) {
531 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
532 return NULL;
533 }
534 } else {
535 if (ret->type == 0)
536 ASN1_OBJECT_free(ret->value.named_curve);
537 else if (ret->type == 1 && ret->value.parameters)
538 ECPARAMETERS_free(ret->value.parameters);
539 }
540
541 if (EC_GROUP_get_asn1_flag(group)) {
542 /*
543 * use the asn1 OID to describe the elliptic curve parameters
544 */
545 tmp = EC_GROUP_get_curve_name(group);
546 if (tmp) {
547 ret->type = 0;
548 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
549 ok = 0;
550 } else
551 /* we don't know the nid => ERROR */
552 ok = 0;
553 } else {
554 /* use the ECPARAMETERS structure */
555 ret->type = 1;
556 if ((ret->value.parameters =
557 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
558 ok = 0;
559 }
560
561 if (!ok) {
562 ECPKPARAMETERS_free(ret);
563 return NULL;
564 }
565 return ret;
566 }
567
568 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
569 {
570 int ok = 0, tmp;
571 EC_GROUP *ret = NULL;
572 BIGNUM *p = NULL, *a = NULL, *b = NULL;
573 EC_POINT *point = NULL;
574 long field_bits;
575
576 if (!params->fieldID || !params->fieldID->fieldType ||
577 !params->fieldID->p.ptr) {
578 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
579 goto err;
580 }
581
582 /*
583 * Now extract the curve parameters a and b. Note that, although SEC 1
584 * specifies the length of their encodings, historical versions of OpenSSL
585 * encoded them incorrectly, so we must accept any length for backwards
586 * compatibility.
587 */
588 if (!params->curve || !params->curve->a ||
589 !params->curve->a->data || !params->curve->b ||
590 !params->curve->b->data) {
591 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
592 goto err;
593 }
594 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
595 if (a == NULL) {
596 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
597 goto err;
598 }
599 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
600 if (b == NULL) {
601 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
602 goto err;
603 }
604
605 /* get the field parameters */
606 tmp = OBJ_obj2nid(params->fieldID->fieldType);
607 if (tmp == NID_X9_62_characteristic_two_field)
608 #ifdef OPENSSL_NO_EC2M
609 {
610 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
611 goto err;
612 }
613 #else
614 {
615 X9_62_CHARACTERISTIC_TWO *char_two;
616
617 char_two = params->fieldID->p.char_two;
618
619 field_bits = char_two->m;
620 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
621 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
622 goto err;
623 }
624
625 if ((p = BN_new()) == NULL) {
626 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
627 goto err;
628 }
629
630 /* get the base type */
631 tmp = OBJ_obj2nid(char_two->type);
632
633 if (tmp == NID_X9_62_tpBasis) {
634 long tmp_long;
635
636 if (!char_two->p.tpBasis) {
637 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
638 goto err;
639 }
640
641 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
642
643 if (!(char_two->m > tmp_long && tmp_long > 0)) {
644 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
645 EC_R_INVALID_TRINOMIAL_BASIS);
646 goto err;
647 }
648
649 /* create the polynomial */
650 if (!BN_set_bit(p, (int)char_two->m))
651 goto err;
652 if (!BN_set_bit(p, (int)tmp_long))
653 goto err;
654 if (!BN_set_bit(p, 0))
655 goto err;
656 } else if (tmp == NID_X9_62_ppBasis) {
657 X9_62_PENTANOMIAL *penta;
658
659 penta = char_two->p.ppBasis;
660 if (!penta) {
661 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
662 goto err;
663 }
664
665 if (!
666 (char_two->m > penta->k3 && penta->k3 > penta->k2
667 && penta->k2 > penta->k1 && penta->k1 > 0)) {
668 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
669 EC_R_INVALID_PENTANOMIAL_BASIS);
670 goto err;
671 }
672
673 /* create the polynomial */
674 if (!BN_set_bit(p, (int)char_two->m))
675 goto err;
676 if (!BN_set_bit(p, (int)penta->k1))
677 goto err;
678 if (!BN_set_bit(p, (int)penta->k2))
679 goto err;
680 if (!BN_set_bit(p, (int)penta->k3))
681 goto err;
682 if (!BN_set_bit(p, 0))
683 goto err;
684 } else if (tmp == NID_X9_62_onBasis) {
685 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
686 goto err;
687 } else { /* error */
688
689 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
690 goto err;
691 }
692
693 /* create the EC_GROUP structure */
694 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
695 }
696 #endif
697 else if (tmp == NID_X9_62_prime_field) {
698 /* we have a curve over a prime field */
699 /* extract the prime number */
700 if (!params->fieldID->p.prime) {
701 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
702 goto err;
703 }
704 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
705 if (p == NULL) {
706 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
707 goto err;
708 }
709
710 if (BN_is_negative(p) || BN_is_zero(p)) {
711 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
712 goto err;
713 }
714
715 field_bits = BN_num_bits(p);
716 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
717 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
718 goto err;
719 }
720
721 /* create the EC_GROUP structure */
722 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
723 } else {
724 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
725 goto err;
726 }
727
728 if (ret == NULL) {
729 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
730 goto err;
731 }
732
733 /* extract seed (optional) */
734 if (params->curve->seed != NULL) {
735 OPENSSL_free(ret->seed);
736 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
737 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
738 goto err;
739 }
740 memcpy(ret->seed, params->curve->seed->data,
741 params->curve->seed->length);
742 ret->seed_len = params->curve->seed->length;
743 }
744
745 if (!params->order || !params->base || !params->base->data) {
746 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
747 goto err;
748 }
749
750 if ((point = EC_POINT_new(ret)) == NULL)
751 goto err;
752
753 /* set the point conversion form */
754 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
755 (params->base->data[0] & ~0x01));
756
757 /* extract the ec point */
758 if (!EC_POINT_oct2point(ret, point, params->base->data,
759 params->base->length, NULL)) {
760 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
761 goto err;
762 }
763
764 /* extract the order */
765 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
766 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
767 goto err;
768 }
769 if (BN_is_negative(a) || BN_is_zero(a)) {
770 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
771 goto err;
772 }
773 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
774 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
775 goto err;
776 }
777
778 /* extract the cofactor (optional) */
779 if (params->cofactor == NULL) {
780 BN_free(b);
781 b = NULL;
782 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
783 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
784 goto err;
785 }
786 /* set the generator, order and cofactor (if present) */
787 if (!EC_GROUP_set_generator(ret, point, a, b)) {
788 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
789 goto err;
790 }
791
792 ok = 1;
793
794 err:
795 if (!ok) {
796 EC_GROUP_clear_free(ret);
797 ret = NULL;
798 }
799
800 BN_free(p);
801 BN_free(a);
802 BN_free(b);
803 EC_POINT_free(point);
804 return ret;
805 }
806
807 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
808 {
809 EC_GROUP *ret = NULL;
810 int tmp = 0;
811
812 if (params == NULL) {
813 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
814 return NULL;
815 }
816
817 if (params->type == 0) { /* the curve is given by an OID */
818 tmp = OBJ_obj2nid(params->value.named_curve);
819 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
820 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
821 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
822 return NULL;
823 }
824 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
825 } else if (params->type == 1) { /* the parameters are given by a
826 * ECPARAMETERS structure */
827 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
828 if (!ret) {
829 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
830 return NULL;
831 }
832 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
833 } else if (params->type == 2) { /* implicitlyCA */
834 return NULL;
835 } else {
836 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
837 return NULL;
838 }
839
840 return ret;
841 }
842
843 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
844
845 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
846 {
847 EC_GROUP *group = NULL;
848 ECPKPARAMETERS *params = NULL;
849 const unsigned char *p = *in;
850
851 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
852 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
853 ECPKPARAMETERS_free(params);
854 return NULL;
855 }
856
857 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
858 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
859 ECPKPARAMETERS_free(params);
860 return NULL;
861 }
862
863 if (a) {
864 EC_GROUP_clear_free(*a);
865 *a = group;
866 }
867
868 ECPKPARAMETERS_free(params);
869 *in = p;
870 return group;
871 }
872
873 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
874 {
875 int ret = 0;
876 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
877 if (tmp == NULL) {
878 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
879 return 0;
880 }
881 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
882 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
883 ECPKPARAMETERS_free(tmp);
884 return 0;
885 }
886 ECPKPARAMETERS_free(tmp);
887 return ret;
888 }
889
890 /* some EC_KEY functions */
891
892 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
893 {
894 EC_KEY *ret = NULL;
895 EC_PRIVATEKEY *priv_key = NULL;
896 const unsigned char *p = *in;
897
898 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
899 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
900 return NULL;
901 }
902
903 if (a == NULL || *a == NULL) {
904 if ((ret = EC_KEY_new()) == NULL) {
905 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
906 goto err;
907 }
908 } else
909 ret = *a;
910
911 if (priv_key->parameters) {
912 EC_GROUP_clear_free(ret->group);
913 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
914 }
915
916 if (ret->group == NULL) {
917 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
918 goto err;
919 }
920
921 ret->version = priv_key->version;
922
923 if (priv_key->privateKey) {
924 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
925 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
926 ASN1_STRING_length(pkey)) == 0)
927 goto err;
928 } else {
929 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
930 goto err;
931 }
932
933 EC_POINT_clear_free(ret->pub_key);
934 ret->pub_key = EC_POINT_new(ret->group);
935 if (ret->pub_key == NULL) {
936 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
937 goto err;
938 }
939
940 if (priv_key->publicKey) {
941 const unsigned char *pub_oct;
942 int pub_oct_len;
943
944 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
945 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
946 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
947 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
948 goto err;
949 }
950 } else {
951 if (ret->group->meth->keygenpub == NULL
952 || ret->group->meth->keygenpub(ret) == 0)
953 goto err;
954 /* Remember the original private-key-only encoding. */
955 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
956 }
957
958 if (a)
959 *a = ret;
960 EC_PRIVATEKEY_free(priv_key);
961 *in = p;
962 return ret;
963
964 err:
965 if (a == NULL || *a != ret)
966 EC_KEY_free(ret);
967 EC_PRIVATEKEY_free(priv_key);
968 return NULL;
969 }
970
971 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
972 {
973 int ret = 0, ok = 0;
974 unsigned char *priv= NULL, *pub= NULL;
975 size_t privlen = 0, publen = 0;
976
977 EC_PRIVATEKEY *priv_key = NULL;
978
979 if (a == NULL || a->group == NULL ||
980 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
981 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
982 goto err;
983 }
984
985 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
986 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
987 goto err;
988 }
989
990 priv_key->version = a->version;
991
992 privlen = EC_KEY_priv2buf(a, &priv);
993
994 if (privlen == 0) {
995 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
996 goto err;
997 }
998
999 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1000 priv = NULL;
1001
1002 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1003 if ((priv_key->parameters =
1004 EC_GROUP_get_ecpkparameters(a->group,
1005 priv_key->parameters)) == NULL) {
1006 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1007 goto err;
1008 }
1009 }
1010
1011 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1012 priv_key->publicKey = ASN1_BIT_STRING_new();
1013 if (priv_key->publicKey == NULL) {
1014 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1015 goto err;
1016 }
1017
1018 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1019
1020 if (publen == 0) {
1021 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1022 goto err;
1023 }
1024
1025 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1026 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1027 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1028 pub = NULL;
1029 }
1030
1031 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1032 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1033 goto err;
1034 }
1035 ok = 1;
1036 err:
1037 OPENSSL_clear_free(priv, privlen);
1038 OPENSSL_free(pub);
1039 EC_PRIVATEKEY_free(priv_key);
1040 return (ok ? ret : 0);
1041 }
1042
1043 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1044 {
1045 if (a == NULL) {
1046 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1047 return 0;
1048 }
1049 return i2d_ECPKParameters(a->group, out);
1050 }
1051
1052 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1053 {
1054 EC_KEY *ret;
1055
1056 if (in == NULL || *in == NULL) {
1057 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1058 return NULL;
1059 }
1060
1061 if (a == NULL || *a == NULL) {
1062 if ((ret = EC_KEY_new()) == NULL) {
1063 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1064 return NULL;
1065 }
1066 } else
1067 ret = *a;
1068
1069 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1070 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1071 if (a == NULL || *a != ret)
1072 EC_KEY_free(ret);
1073 return NULL;
1074 }
1075
1076 if (a)
1077 *a = ret;
1078
1079 return ret;
1080 }
1081
1082 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1083 {
1084 EC_KEY *ret = NULL;
1085
1086 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1087 /*
1088 * sorry, but a EC_GROUP-structure is necessary to set the public key
1089 */
1090 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1091 return 0;
1092 }
1093 ret = *a;
1094 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1095 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1096 return 0;
1097 }
1098 *in += len;
1099 return ret;
1100 }
1101
1102 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1103 {
1104 size_t buf_len = 0;
1105 int new_buffer = 0;
1106
1107 if (a == NULL) {
1108 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1109 return 0;
1110 }
1111
1112 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1113 a->conv_form, NULL, 0, NULL);
1114
1115 if (out == NULL || buf_len == 0)
1116 /* out == NULL => just return the length of the octet string */
1117 return buf_len;
1118
1119 if (*out == NULL) {
1120 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1121 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1122 return 0;
1123 }
1124 new_buffer = 1;
1125 }
1126 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1127 *out, buf_len, NULL)) {
1128 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1129 if (new_buffer) {
1130 OPENSSL_free(*out);
1131 *out = NULL;
1132 }
1133 return 0;
1134 }
1135 if (!new_buffer)
1136 *out += buf_len;
1137 return buf_len;
1138 }
1139
1140 ASN1_SEQUENCE(ECDSA_SIG) = {
1141 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1142 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1143 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1144
1145 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1146 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1147 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG)
1148
1149 ECDSA_SIG *ECDSA_SIG_new(void)
1150 {
1151 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1152 if (sig == NULL)
1153 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1154 return sig;
1155 }
1156
1157 void ECDSA_SIG_free(ECDSA_SIG *sig)
1158 {
1159 if (sig == NULL)
1160 return;
1161 BN_clear_free(sig->r);
1162 BN_clear_free(sig->s);
1163 OPENSSL_free(sig);
1164 }
1165
1166 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1167 {
1168 if (pr != NULL)
1169 *pr = sig->r;
1170 if (ps != NULL)
1171 *ps = sig->s;
1172 }
1173
1174 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1175 {
1176 return sig->r;
1177 }
1178
1179 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1180 {
1181 return sig->s;
1182 }
1183
1184 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1185 {
1186 if (r == NULL || s == NULL)
1187 return 0;
1188 BN_clear_free(sig->r);
1189 BN_clear_free(sig->s);
1190 sig->r = r;
1191 sig->s = s;
1192 return 1;
1193 }
1194
1195 int ECDSA_size(const EC_KEY *r)
1196 {
1197 int ret, i;
1198 ASN1_INTEGER bs;
1199 unsigned char buf[4];
1200 const EC_GROUP *group;
1201
1202 if (r == NULL)
1203 return 0;
1204 group = EC_KEY_get0_group(r);
1205 if (group == NULL)
1206 return 0;
1207
1208 i = EC_GROUP_order_bits(group);
1209 if (i == 0)
1210 return 0;
1211 bs.length = (i + 7) / 8;
1212 bs.data = buf;
1213 bs.type = V_ASN1_INTEGER;
1214 /* If the top bit is set the asn1 encoding is 1 larger. */
1215 buf[0] = 0xff;
1216
1217 i = i2d_ASN1_INTEGER(&bs, NULL);
1218 i += i; /* r and s */
1219 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1220 return ret;
1221 }
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