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Copyright consolidation 05/10
[thirdparty/openssl.git] / crypto / ec / ec_asn1.c
1 /*
2 * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (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
16 int EC_GROUP_get_basis_type(const EC_GROUP *group)
17 {
18 int i = 0;
19
20 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
21 NID_X9_62_characteristic_two_field)
22 /* everything else is currently not supported */
23 return 0;
24
25 while (group->poly[i] != 0)
26 i++;
27
28 if (i == 4)
29 return NID_X9_62_ppBasis;
30 else if (i == 2)
31 return NID_X9_62_tpBasis;
32 else
33 /* everything else is currently not supported */
34 return 0;
35 }
36
37 #ifndef OPENSSL_NO_EC2M
38 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
39 {
40 if (group == NULL)
41 return 0;
42
43 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
44 NID_X9_62_characteristic_two_field
45 || !((group->poly[0] != 0) && (group->poly[1] != 0)
46 && (group->poly[2] == 0))) {
47 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
48 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
49 return 0;
50 }
51
52 if (k)
53 *k = group->poly[1];
54
55 return 1;
56 }
57
58 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
59 unsigned int *k2, unsigned int *k3)
60 {
61 if (group == NULL)
62 return 0;
63
64 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
65 NID_X9_62_characteristic_two_field
66 || !((group->poly[0] != 0) && (group->poly[1] != 0)
67 && (group->poly[2] != 0) && (group->poly[3] != 0)
68 && (group->poly[4] == 0))) {
69 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
70 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
71 return 0;
72 }
73
74 if (k1)
75 *k1 = group->poly[3];
76 if (k2)
77 *k2 = group->poly[2];
78 if (k3)
79 *k3 = group->poly[1];
80
81 return 1;
82 }
83 #endif
84
85 /* some structures needed for the asn1 encoding */
86 typedef struct x9_62_pentanomial_st {
87 long k1;
88 long k2;
89 long k3;
90 } X9_62_PENTANOMIAL;
91
92 typedef struct x9_62_characteristic_two_st {
93 long m;
94 ASN1_OBJECT *type;
95 union {
96 char *ptr;
97 /* NID_X9_62_onBasis */
98 ASN1_NULL *onBasis;
99 /* NID_X9_62_tpBasis */
100 ASN1_INTEGER *tpBasis;
101 /* NID_X9_62_ppBasis */
102 X9_62_PENTANOMIAL *ppBasis;
103 /* anything else */
104 ASN1_TYPE *other;
105 } p;
106 } X9_62_CHARACTERISTIC_TWO;
107
108 typedef struct x9_62_fieldid_st {
109 ASN1_OBJECT *fieldType;
110 union {
111 char *ptr;
112 /* NID_X9_62_prime_field */
113 ASN1_INTEGER *prime;
114 /* NID_X9_62_characteristic_two_field */
115 X9_62_CHARACTERISTIC_TWO *char_two;
116 /* anything else */
117 ASN1_TYPE *other;
118 } p;
119 } X9_62_FIELDID;
120
121 typedef struct x9_62_curve_st {
122 ASN1_OCTET_STRING *a;
123 ASN1_OCTET_STRING *b;
124 ASN1_BIT_STRING *seed;
125 } X9_62_CURVE;
126
127 struct ec_parameters_st {
128 long version;
129 X9_62_FIELDID *fieldID;
130 X9_62_CURVE *curve;
131 ASN1_OCTET_STRING *base;
132 ASN1_INTEGER *order;
133 ASN1_INTEGER *cofactor;
134 } /* ECPARAMETERS */ ;
135
136 struct ecpk_parameters_st {
137 int type;
138 union {
139 ASN1_OBJECT *named_curve;
140 ECPARAMETERS *parameters;
141 ASN1_NULL *implicitlyCA;
142 } value;
143 } /* ECPKPARAMETERS */ ;
144
145 /* SEC1 ECPrivateKey */
146 typedef struct ec_privatekey_st {
147 long version;
148 ASN1_OCTET_STRING *privateKey;
149 ECPKPARAMETERS *parameters;
150 ASN1_BIT_STRING *publicKey;
151 } EC_PRIVATEKEY;
152
153 /* the OpenSSL ASN.1 definitions */
154 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
155 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
156 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
157 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
158 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
159
160 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
161 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
162
163 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
164
165 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
166 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
167 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
168 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
169 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
170
171 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
172 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
173 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
174 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
175 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
176
177 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
178 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
179
180 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
181
182 ASN1_ADB(X9_62_FIELDID) = {
183 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
184 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
185 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
186
187 ASN1_SEQUENCE(X9_62_FIELDID) = {
188 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
189 ASN1_ADB_OBJECT(X9_62_FIELDID)
190 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
191
192 ASN1_SEQUENCE(X9_62_CURVE) = {
193 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
194 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
195 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
196 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
197
198 ASN1_SEQUENCE(ECPARAMETERS) = {
199 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
200 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
201 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
202 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
203 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
204 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
205 } ASN1_SEQUENCE_END(ECPARAMETERS)
206
207 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
208 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
209
210 ASN1_CHOICE(ECPKPARAMETERS) = {
211 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
212 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
213 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
214 } ASN1_CHOICE_END(ECPKPARAMETERS)
215
216 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
217 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
218 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
219
220 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
221 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
222 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
223 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
224 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
225 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
226
227 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
228 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
229 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
230
231 /* some declarations of internal function */
232
233 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
234 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
235 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
236 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
237
238 /* the function definitions */
239
240 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
241 {
242 int ok = 0, nid;
243 BIGNUM *tmp = NULL;
244
245 if (group == NULL || field == NULL)
246 return 0;
247
248 /* clear the old values (if necessary) */
249 ASN1_OBJECT_free(field->fieldType);
250 ASN1_TYPE_free(field->p.other);
251
252 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
253 /* set OID for the field */
254 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
255 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
256 goto err;
257 }
258
259 if (nid == NID_X9_62_prime_field) {
260 if ((tmp = BN_new()) == NULL) {
261 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
262 goto err;
263 }
264 /* the parameters are specified by the prime number p */
265 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
266 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
267 goto err;
268 }
269 /* set the prime number */
270 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
271 if (field->p.prime == NULL) {
272 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
273 goto err;
274 }
275 } else if (nid == NID_X9_62_characteristic_two_field)
276 #ifdef OPENSSL_NO_EC2M
277 {
278 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
279 goto err;
280 }
281 #else
282 {
283 int field_type;
284 X9_62_CHARACTERISTIC_TWO *char_two;
285
286 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
287 char_two = field->p.char_two;
288
289 if (char_two == NULL) {
290 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
291 goto err;
292 }
293
294 char_two->m = (long)EC_GROUP_get_degree(group);
295
296 field_type = EC_GROUP_get_basis_type(group);
297
298 if (field_type == 0) {
299 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
300 goto err;
301 }
302 /* set base type OID */
303 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
304 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
305 goto err;
306 }
307
308 if (field_type == NID_X9_62_tpBasis) {
309 unsigned int k;
310
311 if (!EC_GROUP_get_trinomial_basis(group, &k))
312 goto err;
313
314 char_two->p.tpBasis = ASN1_INTEGER_new();
315 if (char_two->p.tpBasis == NULL) {
316 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
317 goto err;
318 }
319 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
320 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
321 goto err;
322 }
323 } else if (field_type == NID_X9_62_ppBasis) {
324 unsigned int k1, k2, k3;
325
326 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
327 goto err;
328
329 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
330 if (char_two->p.ppBasis == NULL) {
331 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
332 goto err;
333 }
334
335 /* set k? values */
336 char_two->p.ppBasis->k1 = (long)k1;
337 char_two->p.ppBasis->k2 = (long)k2;
338 char_two->p.ppBasis->k3 = (long)k3;
339 } else { /* field_type == NID_X9_62_onBasis */
340
341 /* for ONB the parameters are (asn1) NULL */
342 char_two->p.onBasis = ASN1_NULL_new();
343 if (char_two->p.onBasis == NULL) {
344 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
345 goto err;
346 }
347 }
348 }
349 #endif
350 else {
351 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
352 goto err;
353 }
354
355 ok = 1;
356
357 err:
358 BN_free(tmp);
359 return (ok);
360 }
361
362 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
363 {
364 int ok = 0, nid;
365 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
366 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
367 *a_buf = NULL, *b_buf = NULL;
368 size_t len_1, len_2;
369 unsigned char char_zero = 0;
370
371 if (!group || !curve || !curve->a || !curve->b)
372 return 0;
373
374 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
375 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
376 goto err;
377 }
378
379 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
380
381 /* get a and b */
382 if (nid == NID_X9_62_prime_field) {
383 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
384 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
385 goto err;
386 }
387 }
388 #ifndef OPENSSL_NO_EC2M
389 else { /* nid == NID_X9_62_characteristic_two_field */
390
391 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
392 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
393 goto err;
394 }
395 }
396 #endif
397 len_1 = (size_t)BN_num_bytes(tmp_1);
398 len_2 = (size_t)BN_num_bytes(tmp_2);
399
400 if (len_1 == 0) {
401 /* len_1 == 0 => a == 0 */
402 a_buf = &char_zero;
403 len_1 = 1;
404 } else {
405 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
406 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
407 goto err;
408 }
409 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
410 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
411 goto err;
412 }
413 a_buf = buffer_1;
414 }
415
416 if (len_2 == 0) {
417 /* len_2 == 0 => b == 0 */
418 b_buf = &char_zero;
419 len_2 = 1;
420 } else {
421 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
422 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
423 goto err;
424 }
425 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
426 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
427 goto err;
428 }
429 b_buf = buffer_2;
430 }
431
432 /* set a and b */
433 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
434 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
435 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
436 goto err;
437 }
438
439 /* set the seed (optional) */
440 if (group->seed) {
441 if (!curve->seed)
442 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
443 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
444 goto err;
445 }
446 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
447 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
448 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
449 (int)group->seed_len)) {
450 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
451 goto err;
452 }
453 } else {
454 ASN1_BIT_STRING_free(curve->seed);
455 curve->seed = NULL;
456 }
457
458 ok = 1;
459
460 err:
461 OPENSSL_free(buffer_1);
462 OPENSSL_free(buffer_2);
463 BN_free(tmp_1);
464 BN_free(tmp_2);
465 return (ok);
466 }
467
468 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
469 ECPARAMETERS *params)
470 {
471 size_t len = 0;
472 ECPARAMETERS *ret = NULL;
473 const BIGNUM *tmp;
474 unsigned char *buffer = NULL;
475 const EC_POINT *point = NULL;
476 point_conversion_form_t form;
477
478 if (params == NULL) {
479 if ((ret = ECPARAMETERS_new()) == NULL) {
480 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
481 goto err;
482 }
483 } else
484 ret = params;
485
486 /* set the version (always one) */
487 ret->version = (long)0x1;
488
489 /* set the fieldID */
490 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
491 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
492 goto err;
493 }
494
495 /* set the curve */
496 if (!ec_asn1_group2curve(group, ret->curve)) {
497 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
498 goto err;
499 }
500
501 /* set the base point */
502 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
503 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
504 goto err;
505 }
506
507 form = EC_GROUP_get_point_conversion_form(group);
508
509 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
510 if (len == 0) {
511 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
512 goto err;
513 }
514 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
515 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
516 goto err;
517 }
518 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
519 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
520 goto err;
521 }
522
523 /* set the order */
524 tmp = EC_GROUP_get0_order(group);
525 if (tmp == NULL) {
526 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
527 goto err;
528 }
529 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
530 if (ret->order == NULL) {
531 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
532 goto err;
533 }
534
535 /* set the cofactor (optional) */
536 tmp = EC_GROUP_get0_cofactor(group);
537 if (tmp != NULL) {
538 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
539 if (ret->cofactor == NULL) {
540 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
541 goto err;
542 }
543 }
544
545 return ret;
546
547 err:
548 if (params == NULL)
549 ECPARAMETERS_free(ret);
550 OPENSSL_free(buffer);
551 return NULL;
552 }
553
554 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
555 ECPKPARAMETERS *params)
556 {
557 int ok = 1, tmp;
558 ECPKPARAMETERS *ret = params;
559
560 if (ret == NULL) {
561 if ((ret = ECPKPARAMETERS_new()) == NULL) {
562 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
563 return NULL;
564 }
565 } else {
566 if (ret->type == 0)
567 ASN1_OBJECT_free(ret->value.named_curve);
568 else if (ret->type == 1 && ret->value.parameters)
569 ECPARAMETERS_free(ret->value.parameters);
570 }
571
572 if (EC_GROUP_get_asn1_flag(group)) {
573 /*
574 * use the asn1 OID to describe the the elliptic curve parameters
575 */
576 tmp = EC_GROUP_get_curve_name(group);
577 if (tmp) {
578 ret->type = 0;
579 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
580 ok = 0;
581 } else
582 /* we don't know the nid => ERROR */
583 ok = 0;
584 } else {
585 /* use the ECPARAMETERS structure */
586 ret->type = 1;
587 if ((ret->value.parameters =
588 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
589 ok = 0;
590 }
591
592 if (!ok) {
593 ECPKPARAMETERS_free(ret);
594 return NULL;
595 }
596 return ret;
597 }
598
599 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
600 {
601 int ok = 0, tmp;
602 EC_GROUP *ret = NULL;
603 BIGNUM *p = NULL, *a = NULL, *b = NULL;
604 EC_POINT *point = NULL;
605 long field_bits;
606
607 if (!params->fieldID || !params->fieldID->fieldType ||
608 !params->fieldID->p.ptr) {
609 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
610 goto err;
611 }
612
613 /* now extract the curve parameters a and b */
614 if (!params->curve || !params->curve->a ||
615 !params->curve->a->data || !params->curve->b ||
616 !params->curve->b->data) {
617 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
618 goto err;
619 }
620 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
621 if (a == NULL) {
622 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
623 goto err;
624 }
625 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
626 if (b == NULL) {
627 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
628 goto err;
629 }
630
631 /* get the field parameters */
632 tmp = OBJ_obj2nid(params->fieldID->fieldType);
633 if (tmp == NID_X9_62_characteristic_two_field)
634 #ifdef OPENSSL_NO_EC2M
635 {
636 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
637 goto err;
638 }
639 #else
640 {
641 X9_62_CHARACTERISTIC_TWO *char_two;
642
643 char_two = params->fieldID->p.char_two;
644
645 field_bits = char_two->m;
646 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
647 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
648 goto err;
649 }
650
651 if ((p = BN_new()) == NULL) {
652 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
653 goto err;
654 }
655
656 /* get the base type */
657 tmp = OBJ_obj2nid(char_two->type);
658
659 if (tmp == NID_X9_62_tpBasis) {
660 long tmp_long;
661
662 if (!char_two->p.tpBasis) {
663 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
664 goto err;
665 }
666
667 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
668
669 if (!(char_two->m > tmp_long && tmp_long > 0)) {
670 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
671 EC_R_INVALID_TRINOMIAL_BASIS);
672 goto err;
673 }
674
675 /* create the polynomial */
676 if (!BN_set_bit(p, (int)char_two->m))
677 goto err;
678 if (!BN_set_bit(p, (int)tmp_long))
679 goto err;
680 if (!BN_set_bit(p, 0))
681 goto err;
682 } else if (tmp == NID_X9_62_ppBasis) {
683 X9_62_PENTANOMIAL *penta;
684
685 penta = char_two->p.ppBasis;
686 if (!penta) {
687 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
688 goto err;
689 }
690
691 if (!
692 (char_two->m > penta->k3 && penta->k3 > penta->k2
693 && penta->k2 > penta->k1 && penta->k1 > 0)) {
694 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
695 EC_R_INVALID_PENTANOMIAL_BASIS);
696 goto err;
697 }
698
699 /* create the polynomial */
700 if (!BN_set_bit(p, (int)char_two->m))
701 goto err;
702 if (!BN_set_bit(p, (int)penta->k1))
703 goto err;
704 if (!BN_set_bit(p, (int)penta->k2))
705 goto err;
706 if (!BN_set_bit(p, (int)penta->k3))
707 goto err;
708 if (!BN_set_bit(p, 0))
709 goto err;
710 } else if (tmp == NID_X9_62_onBasis) {
711 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
712 goto err;
713 } else { /* error */
714
715 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
716 goto err;
717 }
718
719 /* create the EC_GROUP structure */
720 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
721 }
722 #endif
723 else if (tmp == NID_X9_62_prime_field) {
724 /* we have a curve over a prime field */
725 /* extract the prime number */
726 if (!params->fieldID->p.prime) {
727 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
728 goto err;
729 }
730 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
731 if (p == NULL) {
732 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
733 goto err;
734 }
735
736 if (BN_is_negative(p) || BN_is_zero(p)) {
737 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
738 goto err;
739 }
740
741 field_bits = BN_num_bits(p);
742 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
743 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
744 goto err;
745 }
746
747 /* create the EC_GROUP structure */
748 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
749 } else {
750 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
751 goto err;
752 }
753
754 if (ret == NULL) {
755 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
756 goto err;
757 }
758
759 /* extract seed (optional) */
760 if (params->curve->seed != NULL) {
761 OPENSSL_free(ret->seed);
762 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
763 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
764 goto err;
765 }
766 memcpy(ret->seed, params->curve->seed->data,
767 params->curve->seed->length);
768 ret->seed_len = params->curve->seed->length;
769 }
770
771 if (!params->order || !params->base || !params->base->data) {
772 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
773 goto err;
774 }
775
776 if ((point = EC_POINT_new(ret)) == NULL)
777 goto err;
778
779 /* set the point conversion form */
780 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
781 (params->base->data[0] & ~0x01));
782
783 /* extract the ec point */
784 if (!EC_POINT_oct2point(ret, point, params->base->data,
785 params->base->length, NULL)) {
786 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
787 goto err;
788 }
789
790 /* extract the order */
791 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
792 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
793 goto err;
794 }
795 if (BN_is_negative(a) || BN_is_zero(a)) {
796 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
797 goto err;
798 }
799 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
800 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
801 goto err;
802 }
803
804 /* extract the cofactor (optional) */
805 if (params->cofactor == NULL) {
806 BN_free(b);
807 b = NULL;
808 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
809 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
810 goto err;
811 }
812 /* set the generator, order and cofactor (if present) */
813 if (!EC_GROUP_set_generator(ret, point, a, b)) {
814 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
815 goto err;
816 }
817
818 ok = 1;
819
820 err:
821 if (!ok) {
822 EC_GROUP_clear_free(ret);
823 ret = NULL;
824 }
825
826 BN_free(p);
827 BN_free(a);
828 BN_free(b);
829 EC_POINT_free(point);
830 return (ret);
831 }
832
833 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
834 {
835 EC_GROUP *ret = NULL;
836 int tmp = 0;
837
838 if (params == NULL) {
839 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
840 return NULL;
841 }
842
843 if (params->type == 0) { /* the curve is given by an OID */
844 tmp = OBJ_obj2nid(params->value.named_curve);
845 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
846 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
847 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
848 return NULL;
849 }
850 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
851 } else if (params->type == 1) { /* the parameters are given by a
852 * ECPARAMETERS structure */
853 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
854 if (!ret) {
855 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
856 return NULL;
857 }
858 EC_GROUP_set_asn1_flag(ret, 0x0);
859 } else if (params->type == 2) { /* implicitlyCA */
860 return NULL;
861 } else {
862 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
863 return NULL;
864 }
865
866 return ret;
867 }
868
869 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
870
871 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
872 {
873 EC_GROUP *group = NULL;
874 ECPKPARAMETERS *params = NULL;
875 const unsigned char *p = *in;
876
877 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
878 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
879 ECPKPARAMETERS_free(params);
880 return NULL;
881 }
882
883 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
884 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
885 ECPKPARAMETERS_free(params);
886 return NULL;
887 }
888
889 if (a) {
890 EC_GROUP_clear_free(*a);
891 *a = group;
892 }
893
894 ECPKPARAMETERS_free(params);
895 *in = p;
896 return (group);
897 }
898
899 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
900 {
901 int ret = 0;
902 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
903 if (tmp == NULL) {
904 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
905 return 0;
906 }
907 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
908 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
909 ECPKPARAMETERS_free(tmp);
910 return 0;
911 }
912 ECPKPARAMETERS_free(tmp);
913 return (ret);
914 }
915
916 /* some EC_KEY functions */
917
918 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
919 {
920 EC_KEY *ret = NULL;
921 EC_PRIVATEKEY *priv_key = NULL;
922 const unsigned char *p = *in;
923
924 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
925 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
926 return NULL;
927 }
928
929 if (a == NULL || *a == NULL) {
930 if ((ret = EC_KEY_new()) == NULL) {
931 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
932 goto err;
933 }
934 } else
935 ret = *a;
936
937 if (priv_key->parameters) {
938 EC_GROUP_clear_free(ret->group);
939 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
940 }
941
942 if (ret->group == NULL) {
943 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
944 goto err;
945 }
946
947 ret->version = priv_key->version;
948
949 if (priv_key->privateKey) {
950 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
951 if (EC_KEY_oct2priv(ret, ASN1_STRING_data(pkey),
952 ASN1_STRING_length(pkey)) == 0)
953 goto err;
954 } else {
955 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
956 goto err;
957 }
958
959 EC_POINT_clear_free(ret->pub_key);
960 ret->pub_key = EC_POINT_new(ret->group);
961 if (ret->pub_key == NULL) {
962 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
963 goto err;
964 }
965
966 if (priv_key->publicKey) {
967 const unsigned char *pub_oct;
968 int pub_oct_len;
969
970 pub_oct = ASN1_STRING_data(priv_key->publicKey);
971 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
972 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
973 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
974 goto err;
975 }
976 } else {
977 if (ret->group->meth->keygenpub == NULL
978 || ret->group->meth->keygenpub(ret) == 0)
979 goto err;
980 /* Remember the original private-key-only encoding. */
981 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
982 }
983
984 if (a)
985 *a = ret;
986 EC_PRIVATEKEY_free(priv_key);
987 *in = p;
988 return (ret);
989
990 err:
991 if (a == NULL || *a != ret)
992 EC_KEY_free(ret);
993 EC_PRIVATEKEY_free(priv_key);
994 return NULL;
995 }
996
997 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
998 {
999 int ret = 0, ok = 0;
1000 unsigned char *priv= NULL, *pub= NULL;
1001 size_t privlen = 0, publen = 0;
1002
1003 EC_PRIVATEKEY *priv_key = NULL;
1004
1005 if (a == NULL || a->group == NULL ||
1006 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1007 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1008 goto err;
1009 }
1010
1011 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1012 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1013 goto err;
1014 }
1015
1016 priv_key->version = a->version;
1017
1018 privlen = EC_KEY_priv2buf(a, &priv);
1019
1020 if (privlen == 0) {
1021 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1022 goto err;
1023 }
1024
1025 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1026 priv = NULL;
1027
1028 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1029 if ((priv_key->parameters =
1030 EC_GROUP_get_ecpkparameters(a->group,
1031 priv_key->parameters)) == NULL) {
1032 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1033 goto err;
1034 }
1035 }
1036
1037 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1038 priv_key->publicKey = ASN1_BIT_STRING_new();
1039 if (priv_key->publicKey == NULL) {
1040 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1041 goto err;
1042 }
1043
1044 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1045
1046 if (publen == 0) {
1047 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1048 goto err;
1049 }
1050
1051 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1052 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1053 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1054 pub = NULL;
1055 }
1056
1057 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1058 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1059 goto err;
1060 }
1061 ok = 1;
1062 err:
1063 OPENSSL_clear_free(priv, privlen);
1064 OPENSSL_free(pub);
1065 EC_PRIVATEKEY_free(priv_key);
1066 return (ok ? ret : 0);
1067 }
1068
1069 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1070 {
1071 if (a == NULL) {
1072 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1073 return 0;
1074 }
1075 return i2d_ECPKParameters(a->group, out);
1076 }
1077
1078 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1079 {
1080 EC_KEY *ret;
1081
1082 if (in == NULL || *in == NULL) {
1083 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1084 return NULL;
1085 }
1086
1087 if (a == NULL || *a == NULL) {
1088 if ((ret = EC_KEY_new()) == NULL) {
1089 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1090 return NULL;
1091 }
1092 } else
1093 ret = *a;
1094
1095 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1096 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1097 if (a == NULL || *a != ret)
1098 EC_KEY_free(ret);
1099 return NULL;
1100 }
1101
1102 if (a)
1103 *a = ret;
1104
1105 return ret;
1106 }
1107
1108 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1109 {
1110 EC_KEY *ret = NULL;
1111
1112 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1113 /*
1114 * sorry, but a EC_GROUP-structure is necessary to set the public key
1115 */
1116 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1117 return 0;
1118 }
1119 ret = *a;
1120 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1121 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1122 return 0;
1123 }
1124 *in += len;
1125 return ret;
1126 }
1127
1128 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1129 {
1130 size_t buf_len = 0;
1131 int new_buffer = 0;
1132
1133 if (a == NULL) {
1134 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1135 return 0;
1136 }
1137
1138 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1139 a->conv_form, NULL, 0, NULL);
1140
1141 if (out == NULL || buf_len == 0)
1142 /* out == NULL => just return the length of the octet string */
1143 return buf_len;
1144
1145 if (*out == NULL) {
1146 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1147 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1148 return 0;
1149 }
1150 new_buffer = 1;
1151 }
1152 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1153 *out, buf_len, NULL)) {
1154 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1155 if (new_buffer) {
1156 OPENSSL_free(*out);
1157 *out = NULL;
1158 }
1159 return 0;
1160 }
1161 if (!new_buffer)
1162 *out += buf_len;
1163 return buf_len;
1164 }
1165
1166 ASN1_SEQUENCE(ECDSA_SIG) = {
1167 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1168 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1169 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1170
1171 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1172 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1173 IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG)
1174
1175 void ECDSA_SIG_get0(BIGNUM **pr, BIGNUM **ps, const ECDSA_SIG *sig)
1176 {
1177 if (pr != NULL)
1178 *pr = sig->r;
1179 if (ps != NULL)
1180 *ps = sig->s;
1181 }
1182
1183 int ECDSA_size(const EC_KEY *r)
1184 {
1185 int ret, i;
1186 ASN1_INTEGER bs;
1187 unsigned char buf[4];
1188 const EC_GROUP *group;
1189
1190 if (r == NULL)
1191 return 0;
1192 group = EC_KEY_get0_group(r);
1193 if (group == NULL)
1194 return 0;
1195
1196 i = EC_GROUP_order_bits(group);
1197 if (i == 0)
1198 return 0;
1199 bs.length = (i + 7) / 8;
1200 bs.data = buf;
1201 bs.type = V_ASN1_INTEGER;
1202 /* If the top bit is set the asn1 encoding is 1 larger. */
1203 buf[0] = 0xff;
1204
1205 i = i2d_ASN1_INTEGER(&bs, NULL);
1206 i += i; /* r and s */
1207 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1208 return (ret);
1209 }
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