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ASN.1: adapt our use of INTxx et al by making them explicitely embedded
[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;
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 /* Find the last non-zero element of group->poly[] */
26 for (i = 0;
27 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
28 i++)
29 continue;
30
31 if (i == 4)
32 return NID_X9_62_ppBasis;
33 else if (i == 2)
34 return NID_X9_62_tpBasis;
35 else
36 /* everything else is currently not supported */
37 return 0;
38 }
39
40 #ifndef OPENSSL_NO_EC2M
41 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
42 {
43 if (group == NULL)
44 return 0;
45
46 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
47 NID_X9_62_characteristic_two_field
48 || !((group->poly[0] != 0) && (group->poly[1] != 0)
49 && (group->poly[2] == 0))) {
50 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
51 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
52 return 0;
53 }
54
55 if (k)
56 *k = group->poly[1];
57
58 return 1;
59 }
60
61 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
62 unsigned int *k2, unsigned int *k3)
63 {
64 if (group == NULL)
65 return 0;
66
67 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
68 NID_X9_62_characteristic_two_field
69 || !((group->poly[0] != 0) && (group->poly[1] != 0)
70 && (group->poly[2] != 0) && (group->poly[3] != 0)
71 && (group->poly[4] == 0))) {
72 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
73 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
74 return 0;
75 }
76
77 if (k1)
78 *k1 = group->poly[3];
79 if (k2)
80 *k2 = group->poly[2];
81 if (k3)
82 *k3 = group->poly[1];
83
84 return 1;
85 }
86 #endif
87
88 /* some structures needed for the asn1 encoding */
89 typedef struct x9_62_pentanomial_st {
90 int32_t k1;
91 int32_t k2;
92 int32_t k3;
93 } X9_62_PENTANOMIAL;
94
95 typedef struct x9_62_characteristic_two_st {
96 int32_t m;
97 ASN1_OBJECT *type;
98 union {
99 char *ptr;
100 /* NID_X9_62_onBasis */
101 ASN1_NULL *onBasis;
102 /* NID_X9_62_tpBasis */
103 ASN1_INTEGER *tpBasis;
104 /* NID_X9_62_ppBasis */
105 X9_62_PENTANOMIAL *ppBasis;
106 /* anything else */
107 ASN1_TYPE *other;
108 } p;
109 } X9_62_CHARACTERISTIC_TWO;
110
111 typedef struct x9_62_fieldid_st {
112 ASN1_OBJECT *fieldType;
113 union {
114 char *ptr;
115 /* NID_X9_62_prime_field */
116 ASN1_INTEGER *prime;
117 /* NID_X9_62_characteristic_two_field */
118 X9_62_CHARACTERISTIC_TWO *char_two;
119 /* anything else */
120 ASN1_TYPE *other;
121 } p;
122 } X9_62_FIELDID;
123
124 typedef struct x9_62_curve_st {
125 ASN1_OCTET_STRING *a;
126 ASN1_OCTET_STRING *b;
127 ASN1_BIT_STRING *seed;
128 } X9_62_CURVE;
129
130 struct ec_parameters_st {
131 int32_t version;
132 X9_62_FIELDID *fieldID;
133 X9_62_CURVE *curve;
134 ASN1_OCTET_STRING *base;
135 ASN1_INTEGER *order;
136 ASN1_INTEGER *cofactor;
137 } /* ECPARAMETERS */ ;
138
139 struct ecpk_parameters_st {
140 int type;
141 union {
142 ASN1_OBJECT *named_curve;
143 ECPARAMETERS *parameters;
144 ASN1_NULL *implicitlyCA;
145 } value;
146 } /* ECPKPARAMETERS */ ;
147
148 /* SEC1 ECPrivateKey */
149 typedef struct ec_privatekey_st {
150 int32_t version;
151 ASN1_OCTET_STRING *privateKey;
152 ECPKPARAMETERS *parameters;
153 ASN1_BIT_STRING *publicKey;
154 } EC_PRIVATEKEY;
155
156 /* the OpenSSL ASN.1 definitions */
157 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
158 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
159 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
160 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
161 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
162
163 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
164 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
165
166 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
167
168 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
169 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
170 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
171 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
172 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
173
174 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
175 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
176 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
177 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
178 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
179
180 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
181 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
182
183 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
184
185 ASN1_ADB(X9_62_FIELDID) = {
186 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
187 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
188 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
189
190 ASN1_SEQUENCE(X9_62_FIELDID) = {
191 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
192 ASN1_ADB_OBJECT(X9_62_FIELDID)
193 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
194
195 ASN1_SEQUENCE(X9_62_CURVE) = {
196 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
197 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
198 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
199 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
200
201 ASN1_SEQUENCE(ECPARAMETERS) = {
202 ASN1_EMBED(ECPARAMETERS, version, INT32),
203 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
204 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
205 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
206 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
207 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
208 } ASN1_SEQUENCE_END(ECPARAMETERS)
209
210 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
211 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
212
213 ASN1_CHOICE(ECPKPARAMETERS) = {
214 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
215 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
216 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
217 } ASN1_CHOICE_END(ECPKPARAMETERS)
218
219 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
220 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
221 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
222
223 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
224 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
225 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
226 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
227 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
228 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
229
230 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
231 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
232 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
233
234 /* some declarations of internal function */
235
236 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
237 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
238 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
239 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
240
241 /* the function definitions */
242
243 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
244 {
245 int ok = 0, nid;
246 BIGNUM *tmp = NULL;
247
248 if (group == NULL || field == NULL)
249 return 0;
250
251 /* clear the old values (if necessary) */
252 ASN1_OBJECT_free(field->fieldType);
253 ASN1_TYPE_free(field->p.other);
254
255 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
256 /* set OID for the field */
257 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
258 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
259 goto err;
260 }
261
262 if (nid == NID_X9_62_prime_field) {
263 if ((tmp = BN_new()) == NULL) {
264 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
265 goto err;
266 }
267 /* the parameters are specified by the prime number p */
268 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
269 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
270 goto err;
271 }
272 /* set the prime number */
273 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
274 if (field->p.prime == NULL) {
275 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
276 goto err;
277 }
278 } else if (nid == NID_X9_62_characteristic_two_field)
279 #ifdef OPENSSL_NO_EC2M
280 {
281 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
282 goto err;
283 }
284 #else
285 {
286 int field_type;
287 X9_62_CHARACTERISTIC_TWO *char_two;
288
289 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
290 char_two = field->p.char_two;
291
292 if (char_two == NULL) {
293 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
294 goto err;
295 }
296
297 char_two->m = (long)EC_GROUP_get_degree(group);
298
299 field_type = EC_GROUP_get_basis_type(group);
300
301 if (field_type == 0) {
302 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
303 goto err;
304 }
305 /* set base type OID */
306 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
307 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
308 goto err;
309 }
310
311 if (field_type == NID_X9_62_tpBasis) {
312 unsigned int k;
313
314 if (!EC_GROUP_get_trinomial_basis(group, &k))
315 goto err;
316
317 char_two->p.tpBasis = ASN1_INTEGER_new();
318 if (char_two->p.tpBasis == NULL) {
319 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
320 goto err;
321 }
322 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
323 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
324 goto err;
325 }
326 } else if (field_type == NID_X9_62_ppBasis) {
327 unsigned int k1, k2, k3;
328
329 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
330 goto err;
331
332 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
333 if (char_two->p.ppBasis == NULL) {
334 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
335 goto err;
336 }
337
338 /* set k? values */
339 char_two->p.ppBasis->k1 = (long)k1;
340 char_two->p.ppBasis->k2 = (long)k2;
341 char_two->p.ppBasis->k3 = (long)k3;
342 } else { /* field_type == NID_X9_62_onBasis */
343
344 /* for ONB the parameters are (asn1) NULL */
345 char_two->p.onBasis = ASN1_NULL_new();
346 if (char_two->p.onBasis == NULL) {
347 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
348 goto err;
349 }
350 }
351 }
352 #endif
353 else {
354 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
355 goto err;
356 }
357
358 ok = 1;
359
360 err:
361 BN_free(tmp);
362 return (ok);
363 }
364
365 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
366 {
367 int ok = 0, nid;
368 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
369 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
370 *a_buf = NULL, *b_buf = NULL;
371 size_t len_1, len_2;
372 unsigned char char_zero = 0;
373
374 if (!group || !curve || !curve->a || !curve->b)
375 return 0;
376
377 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
378 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
379 goto err;
380 }
381
382 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
383
384 /* get a and b */
385 if (nid == NID_X9_62_prime_field) {
386 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
387 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
388 goto err;
389 }
390 }
391 #ifndef OPENSSL_NO_EC2M
392 else { /* nid == NID_X9_62_characteristic_two_field */
393
394 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
395 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
396 goto err;
397 }
398 }
399 #endif
400 len_1 = (size_t)BN_num_bytes(tmp_1);
401 len_2 = (size_t)BN_num_bytes(tmp_2);
402
403 if (len_1 == 0) {
404 /* len_1 == 0 => a == 0 */
405 a_buf = &char_zero;
406 len_1 = 1;
407 } else {
408 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
409 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
410 goto err;
411 }
412 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
413 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
414 goto err;
415 }
416 a_buf = buffer_1;
417 }
418
419 if (len_2 == 0) {
420 /* len_2 == 0 => b == 0 */
421 b_buf = &char_zero;
422 len_2 = 1;
423 } else {
424 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
425 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
426 goto err;
427 }
428 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
429 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
430 goto err;
431 }
432 b_buf = buffer_2;
433 }
434
435 /* set a and b */
436 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
437 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
438 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
439 goto err;
440 }
441
442 /* set the seed (optional) */
443 if (group->seed) {
444 if (!curve->seed)
445 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
446 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
447 goto err;
448 }
449 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
450 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
451 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
452 (int)group->seed_len)) {
453 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
454 goto err;
455 }
456 } else {
457 ASN1_BIT_STRING_free(curve->seed);
458 curve->seed = NULL;
459 }
460
461 ok = 1;
462
463 err:
464 OPENSSL_free(buffer_1);
465 OPENSSL_free(buffer_2);
466 BN_free(tmp_1);
467 BN_free(tmp_2);
468 return (ok);
469 }
470
471 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
472 ECPARAMETERS *params)
473 {
474 size_t len = 0;
475 ECPARAMETERS *ret = NULL;
476 const BIGNUM *tmp;
477 unsigned char *buffer = NULL;
478 const EC_POINT *point = NULL;
479 point_conversion_form_t form;
480
481 if (params == NULL) {
482 if ((ret = ECPARAMETERS_new()) == NULL) {
483 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
484 goto err;
485 }
486 } else
487 ret = params;
488
489 /* set the version (always one) */
490 ret->version = (long)0x1;
491
492 /* set the fieldID */
493 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
494 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
495 goto err;
496 }
497
498 /* set the curve */
499 if (!ec_asn1_group2curve(group, ret->curve)) {
500 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
501 goto err;
502 }
503
504 /* set the base point */
505 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
506 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
507 goto err;
508 }
509
510 form = EC_GROUP_get_point_conversion_form(group);
511
512 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
513 if (len == 0) {
514 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
515 goto err;
516 }
517 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
518 OPENSSL_free(buffer);
519 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
520 goto err;
521 }
522 ASN1_STRING_set0(ret->base, buffer, len);
523
524 /* set the order */
525 tmp = EC_GROUP_get0_order(group);
526 if (tmp == NULL) {
527 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
528 goto err;
529 }
530 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
531 if (ret->order == NULL) {
532 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
533 goto err;
534 }
535
536 /* set the cofactor (optional) */
537 tmp = EC_GROUP_get0_cofactor(group);
538 if (tmp != NULL) {
539 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
540 if (ret->cofactor == NULL) {
541 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
542 goto err;
543 }
544 }
545
546 return ret;
547
548 err:
549 if (params == NULL)
550 ECPARAMETERS_free(ret);
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_get0_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_get0_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(const 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_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG)
1174
1175 ECDSA_SIG *ECDSA_SIG_new(void)
1176 {
1177 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1178 if (sig == NULL)
1179 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1180 return sig;
1181 }
1182
1183 void ECDSA_SIG_free(ECDSA_SIG *sig)
1184 {
1185 if (sig == NULL)
1186 return;
1187 BN_clear_free(sig->r);
1188 BN_clear_free(sig->s);
1189 OPENSSL_free(sig);
1190 }
1191
1192 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1193 {
1194 if (pr != NULL)
1195 *pr = sig->r;
1196 if (ps != NULL)
1197 *ps = sig->s;
1198 }
1199
1200 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1201 {
1202 if (r == NULL || s == NULL)
1203 return 0;
1204 BN_clear_free(sig->r);
1205 BN_clear_free(sig->s);
1206 sig->r = r;
1207 sig->s = s;
1208 return 1;
1209 }
1210
1211 int ECDSA_size(const EC_KEY *r)
1212 {
1213 int ret, i;
1214 ASN1_INTEGER bs;
1215 unsigned char buf[4];
1216 const EC_GROUP *group;
1217
1218 if (r == NULL)
1219 return 0;
1220 group = EC_KEY_get0_group(r);
1221 if (group == NULL)
1222 return 0;
1223
1224 i = EC_GROUP_order_bits(group);
1225 if (i == 0)
1226 return 0;
1227 bs.length = (i + 7) / 8;
1228 bs.data = buf;
1229 bs.type = V_ASN1_INTEGER;
1230 /* If the top bit is set the asn1 encoding is 1 larger. */
1231 buf[0] = 0xff;
1232
1233 i = i2d_ASN1_INTEGER(&bs, NULL);
1234 i += i; /* r and s */
1235 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1236 return (ret);
1237 }
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