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Extract compression form in EC_KEY_oct2key().
[thirdparty/openssl.git] / crypto / ec / ec_asn1.c
1 /*
2 * Written by Nils Larsch for the OpenSSL project.
3 */
4 /* ====================================================================
5 * Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
23 *
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
28 *
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
55 *
56 */
57
58 #include <string.h>
59 #include "ec_lcl.h"
60 #include <openssl/err.h>
61 #include <openssl/asn1t.h>
62 #include <openssl/objects.h>
63
64 int EC_GROUP_get_basis_type(const EC_GROUP *group)
65 {
66 int i = 0;
67
68 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
69 NID_X9_62_characteristic_two_field)
70 /* everything else is currently not supported */
71 return 0;
72
73 while (group->poly[i] != 0)
74 i++;
75
76 if (i == 4)
77 return NID_X9_62_ppBasis;
78 else if (i == 2)
79 return NID_X9_62_tpBasis;
80 else
81 /* everything else is currently not supported */
82 return 0;
83 }
84
85 #ifndef OPENSSL_NO_EC2M
86 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
87 {
88 if (group == NULL)
89 return 0;
90
91 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
92 NID_X9_62_characteristic_two_field
93 || !((group->poly[0] != 0) && (group->poly[1] != 0)
94 && (group->poly[2] == 0))) {
95 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
96 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
97 return 0;
98 }
99
100 if (k)
101 *k = group->poly[1];
102
103 return 1;
104 }
105
106 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
107 unsigned int *k2, unsigned int *k3)
108 {
109 if (group == NULL)
110 return 0;
111
112 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
113 NID_X9_62_characteristic_two_field
114 || !((group->poly[0] != 0) && (group->poly[1] != 0)
115 && (group->poly[2] != 0) && (group->poly[3] != 0)
116 && (group->poly[4] == 0))) {
117 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
118 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
119 return 0;
120 }
121
122 if (k1)
123 *k1 = group->poly[3];
124 if (k2)
125 *k2 = group->poly[2];
126 if (k3)
127 *k3 = group->poly[1];
128
129 return 1;
130 }
131 #endif
132
133 /* some structures needed for the asn1 encoding */
134 typedef struct x9_62_pentanomial_st {
135 long k1;
136 long k2;
137 long k3;
138 } X9_62_PENTANOMIAL;
139
140 typedef struct x9_62_characteristic_two_st {
141 long m;
142 ASN1_OBJECT *type;
143 union {
144 char *ptr;
145 /* NID_X9_62_onBasis */
146 ASN1_NULL *onBasis;
147 /* NID_X9_62_tpBasis */
148 ASN1_INTEGER *tpBasis;
149 /* NID_X9_62_ppBasis */
150 X9_62_PENTANOMIAL *ppBasis;
151 /* anything else */
152 ASN1_TYPE *other;
153 } p;
154 } X9_62_CHARACTERISTIC_TWO;
155
156 typedef struct x9_62_fieldid_st {
157 ASN1_OBJECT *fieldType;
158 union {
159 char *ptr;
160 /* NID_X9_62_prime_field */
161 ASN1_INTEGER *prime;
162 /* NID_X9_62_characteristic_two_field */
163 X9_62_CHARACTERISTIC_TWO *char_two;
164 /* anything else */
165 ASN1_TYPE *other;
166 } p;
167 } X9_62_FIELDID;
168
169 typedef struct x9_62_curve_st {
170 ASN1_OCTET_STRING *a;
171 ASN1_OCTET_STRING *b;
172 ASN1_BIT_STRING *seed;
173 } X9_62_CURVE;
174
175 typedef struct ec_parameters_st {
176 long version;
177 X9_62_FIELDID *fieldID;
178 X9_62_CURVE *curve;
179 ASN1_OCTET_STRING *base;
180 ASN1_INTEGER *order;
181 ASN1_INTEGER *cofactor;
182 } ECPARAMETERS;
183
184 struct ecpk_parameters_st {
185 int type;
186 union {
187 ASN1_OBJECT *named_curve;
188 ECPARAMETERS *parameters;
189 ASN1_NULL *implicitlyCA;
190 } value;
191 } /* ECPKPARAMETERS */ ;
192
193 /* SEC1 ECPrivateKey */
194 typedef struct ec_privatekey_st {
195 long version;
196 ASN1_OCTET_STRING *privateKey;
197 ECPKPARAMETERS *parameters;
198 ASN1_BIT_STRING *publicKey;
199 } EC_PRIVATEKEY;
200
201 /* the OpenSSL ASN.1 definitions */
202 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
203 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
204 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
205 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
206 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
207
208 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
209 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
210
211 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
212
213 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
214 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
215 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
216 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
217 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
218
219 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
220 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
221 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
222 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
223 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
224
225 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
226 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
227
228 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
229
230 ASN1_ADB(X9_62_FIELDID) = {
231 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
232 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
233 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
234
235 ASN1_SEQUENCE(X9_62_FIELDID) = {
236 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
237 ASN1_ADB_OBJECT(X9_62_FIELDID)
238 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
239
240 ASN1_SEQUENCE(X9_62_CURVE) = {
241 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
242 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
243 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
244 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
245
246 ASN1_SEQUENCE(ECPARAMETERS) = {
247 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
248 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
249 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
250 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
251 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
252 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
253 } static_ASN1_SEQUENCE_END(ECPARAMETERS)
254
255 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
256 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
257
258 ASN1_CHOICE(ECPKPARAMETERS) = {
259 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
260 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
261 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
262 } static_ASN1_CHOICE_END(ECPKPARAMETERS)
263
264 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
265 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
266 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
267
268 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
269 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
270 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
271 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
272 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
273 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
274
275 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
276 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
277 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
278
279 /* some declarations of internal function */
280
281 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
282 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
283 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
284 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
285 /*
286 * ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
287 * object
288 */
289 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
290 /*
291 * ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
292 * object
293 */
294 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
295 ECPARAMETERS *);
296 /*
297 * ec_asn1_pkparameters2group() creates a EC_GROUP object from a
298 * ECPKPARAMETERS object
299 */
300 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
301 /*
302 * ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
303 * EC_GROUP object
304 */
305 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
306 ECPKPARAMETERS *);
307
308 /* the function definitions */
309
310 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
311 {
312 int ok = 0, nid;
313 BIGNUM *tmp = NULL;
314
315 if (group == NULL || field == NULL)
316 return 0;
317
318 /* clear the old values (if necessary) */
319 ASN1_OBJECT_free(field->fieldType);
320 ASN1_TYPE_free(field->p.other);
321
322 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
323 /* set OID for the field */
324 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
325 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
326 goto err;
327 }
328
329 if (nid == NID_X9_62_prime_field) {
330 if ((tmp = BN_new()) == NULL) {
331 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
332 goto err;
333 }
334 /* the parameters are specified by the prime number p */
335 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
336 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
337 goto err;
338 }
339 /* set the prime number */
340 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
341 if (field->p.prime == NULL) {
342 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
343 goto err;
344 }
345 } else if (nid == NID_X9_62_characteristic_two_field)
346 #ifdef OPENSSL_NO_EC2M
347 {
348 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
349 goto err;
350 }
351 #else
352 {
353 int field_type;
354 X9_62_CHARACTERISTIC_TWO *char_two;
355
356 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
357 char_two = field->p.char_two;
358
359 if (char_two == NULL) {
360 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
361 goto err;
362 }
363
364 char_two->m = (long)EC_GROUP_get_degree(group);
365
366 field_type = EC_GROUP_get_basis_type(group);
367
368 if (field_type == 0) {
369 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
370 goto err;
371 }
372 /* set base type OID */
373 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
374 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
375 goto err;
376 }
377
378 if (field_type == NID_X9_62_tpBasis) {
379 unsigned int k;
380
381 if (!EC_GROUP_get_trinomial_basis(group, &k))
382 goto err;
383
384 char_two->p.tpBasis = ASN1_INTEGER_new();
385 if (char_two->p.tpBasis == NULL) {
386 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
387 goto err;
388 }
389 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
390 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
391 goto err;
392 }
393 } else if (field_type == NID_X9_62_ppBasis) {
394 unsigned int k1, k2, k3;
395
396 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
397 goto err;
398
399 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
400 if (char_two->p.ppBasis == NULL) {
401 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
402 goto err;
403 }
404
405 /* set k? values */
406 char_two->p.ppBasis->k1 = (long)k1;
407 char_two->p.ppBasis->k2 = (long)k2;
408 char_two->p.ppBasis->k3 = (long)k3;
409 } else { /* field_type == NID_X9_62_onBasis */
410
411 /* for ONB the parameters are (asn1) NULL */
412 char_two->p.onBasis = ASN1_NULL_new();
413 if (char_two->p.onBasis == NULL) {
414 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
415 goto err;
416 }
417 }
418 }
419 #endif
420 else {
421 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
422 goto err;
423 }
424
425 ok = 1;
426
427 err:
428 BN_free(tmp);
429 return (ok);
430 }
431
432 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
433 {
434 int ok = 0, nid;
435 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
436 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
437 *a_buf = NULL, *b_buf = NULL;
438 size_t len_1, len_2;
439 unsigned char char_zero = 0;
440
441 if (!group || !curve || !curve->a || !curve->b)
442 return 0;
443
444 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
445 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
446 goto err;
447 }
448
449 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
450
451 /* get a and b */
452 if (nid == NID_X9_62_prime_field) {
453 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
454 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
455 goto err;
456 }
457 }
458 #ifndef OPENSSL_NO_EC2M
459 else { /* nid == NID_X9_62_characteristic_two_field */
460
461 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
462 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
463 goto err;
464 }
465 }
466 #endif
467 len_1 = (size_t)BN_num_bytes(tmp_1);
468 len_2 = (size_t)BN_num_bytes(tmp_2);
469
470 if (len_1 == 0) {
471 /* len_1 == 0 => a == 0 */
472 a_buf = &char_zero;
473 len_1 = 1;
474 } else {
475 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
476 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
477 goto err;
478 }
479 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
480 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
481 goto err;
482 }
483 a_buf = buffer_1;
484 }
485
486 if (len_2 == 0) {
487 /* len_2 == 0 => b == 0 */
488 b_buf = &char_zero;
489 len_2 = 1;
490 } else {
491 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
492 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
493 goto err;
494 }
495 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
496 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
497 goto err;
498 }
499 b_buf = buffer_2;
500 }
501
502 /* set a and b */
503 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
504 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
505 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
506 goto err;
507 }
508
509 /* set the seed (optional) */
510 if (group->seed) {
511 if (!curve->seed)
512 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
513 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
514 goto err;
515 }
516 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
517 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
518 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
519 (int)group->seed_len)) {
520 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
521 goto err;
522 }
523 } else {
524 ASN1_BIT_STRING_free(curve->seed);
525 curve->seed = NULL;
526 }
527
528 ok = 1;
529
530 err:
531 OPENSSL_free(buffer_1);
532 OPENSSL_free(buffer_2);
533 BN_free(tmp_1);
534 BN_free(tmp_2);
535 return (ok);
536 }
537
538 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
539 ECPARAMETERS *param)
540 {
541 size_t len = 0;
542 ECPARAMETERS *ret = NULL;
543 const BIGNUM *tmp;
544 unsigned char *buffer = NULL;
545 const EC_POINT *point = NULL;
546 point_conversion_form_t form;
547
548 if (param == NULL) {
549 if ((ret = ECPARAMETERS_new()) == NULL) {
550 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
551 goto err;
552 }
553 } else
554 ret = param;
555
556 /* set the version (always one) */
557 ret->version = (long)0x1;
558
559 /* set the fieldID */
560 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
561 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
562 goto err;
563 }
564
565 /* set the curve */
566 if (!ec_asn1_group2curve(group, ret->curve)) {
567 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
568 goto err;
569 }
570
571 /* set the base point */
572 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
573 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
574 goto err;
575 }
576
577 form = EC_GROUP_get_point_conversion_form(group);
578
579 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
580 if (len == 0) {
581 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
582 goto err;
583 }
584 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
586 goto err;
587 }
588 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
589 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
590 goto err;
591 }
592
593 /* set the order */
594 tmp = EC_GROUP_get0_order(group);
595 if (tmp == NULL) {
596 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
597 goto err;
598 }
599 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
600 if (ret->order == NULL) {
601 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
602 goto err;
603 }
604
605 /* set the cofactor (optional) */
606 tmp = EC_GROUP_get0_cofactor(group);
607 if (tmp != NULL) {
608 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
609 if (ret->cofactor == NULL) {
610 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
611 goto err;
612 }
613 }
614
615 return ret;
616
617 err:
618 if (!param)
619 ECPARAMETERS_free(ret);
620 OPENSSL_free(buffer);
621 return NULL;
622 }
623
624 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
625 ECPKPARAMETERS *params)
626 {
627 int ok = 1, tmp;
628 ECPKPARAMETERS *ret = params;
629
630 if (ret == NULL) {
631 if ((ret = ECPKPARAMETERS_new()) == NULL) {
632 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
633 return NULL;
634 }
635 } else {
636 if (ret->type == 0)
637 ASN1_OBJECT_free(ret->value.named_curve);
638 else if (ret->type == 1 && ret->value.parameters)
639 ECPARAMETERS_free(ret->value.parameters);
640 }
641
642 if (EC_GROUP_get_asn1_flag(group)) {
643 /*
644 * use the asn1 OID to describe the the elliptic curve parameters
645 */
646 tmp = EC_GROUP_get_curve_name(group);
647 if (tmp) {
648 ret->type = 0;
649 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
650 ok = 0;
651 } else
652 /* we don't know the nid => ERROR */
653 ok = 0;
654 } else {
655 /* use the ECPARAMETERS structure */
656 ret->type = 1;
657 if ((ret->value.parameters =
658 ec_asn1_group2parameters(group, NULL)) == NULL)
659 ok = 0;
660 }
661
662 if (!ok) {
663 ECPKPARAMETERS_free(ret);
664 return NULL;
665 }
666 return ret;
667 }
668
669 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
670 {
671 int ok = 0, tmp;
672 EC_GROUP *ret = NULL;
673 BIGNUM *p = NULL, *a = NULL, *b = NULL;
674 EC_POINT *point = NULL;
675 long field_bits;
676
677 if (!params->fieldID || !params->fieldID->fieldType ||
678 !params->fieldID->p.ptr) {
679 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
680 goto err;
681 }
682
683 /* now extract the curve parameters a and b */
684 if (!params->curve || !params->curve->a ||
685 !params->curve->a->data || !params->curve->b ||
686 !params->curve->b->data) {
687 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
688 goto err;
689 }
690 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
691 if (a == NULL) {
692 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
693 goto err;
694 }
695 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
696 if (b == NULL) {
697 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
698 goto err;
699 }
700
701 /* get the field parameters */
702 tmp = OBJ_obj2nid(params->fieldID->fieldType);
703 if (tmp == NID_X9_62_characteristic_two_field)
704 #ifdef OPENSSL_NO_EC2M
705 {
706 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
707 goto err;
708 }
709 #else
710 {
711 X9_62_CHARACTERISTIC_TWO *char_two;
712
713 char_two = params->fieldID->p.char_two;
714
715 field_bits = char_two->m;
716 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
717 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
718 goto err;
719 }
720
721 if ((p = BN_new()) == NULL) {
722 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
723 goto err;
724 }
725
726 /* get the base type */
727 tmp = OBJ_obj2nid(char_two->type);
728
729 if (tmp == NID_X9_62_tpBasis) {
730 long tmp_long;
731
732 if (!char_two->p.tpBasis) {
733 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
734 goto err;
735 }
736
737 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
738
739 if (!(char_two->m > tmp_long && tmp_long > 0)) {
740 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
741 EC_R_INVALID_TRINOMIAL_BASIS);
742 goto err;
743 }
744
745 /* create the polynomial */
746 if (!BN_set_bit(p, (int)char_two->m))
747 goto err;
748 if (!BN_set_bit(p, (int)tmp_long))
749 goto err;
750 if (!BN_set_bit(p, 0))
751 goto err;
752 } else if (tmp == NID_X9_62_ppBasis) {
753 X9_62_PENTANOMIAL *penta;
754
755 penta = char_two->p.ppBasis;
756 if (!penta) {
757 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
758 goto err;
759 }
760
761 if (!
762 (char_two->m > penta->k3 && penta->k3 > penta->k2
763 && penta->k2 > penta->k1 && penta->k1 > 0)) {
764 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
765 EC_R_INVALID_PENTANOMIAL_BASIS);
766 goto err;
767 }
768
769 /* create the polynomial */
770 if (!BN_set_bit(p, (int)char_two->m))
771 goto err;
772 if (!BN_set_bit(p, (int)penta->k1))
773 goto err;
774 if (!BN_set_bit(p, (int)penta->k2))
775 goto err;
776 if (!BN_set_bit(p, (int)penta->k3))
777 goto err;
778 if (!BN_set_bit(p, 0))
779 goto err;
780 } else if (tmp == NID_X9_62_onBasis) {
781 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
782 goto err;
783 } else { /* error */
784
785 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
786 goto err;
787 }
788
789 /* create the EC_GROUP structure */
790 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
791 }
792 #endif
793 else if (tmp == NID_X9_62_prime_field) {
794 /* we have a curve over a prime field */
795 /* extract the prime number */
796 if (!params->fieldID->p.prime) {
797 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
798 goto err;
799 }
800 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
801 if (p == NULL) {
802 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
803 goto err;
804 }
805
806 if (BN_is_negative(p) || BN_is_zero(p)) {
807 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
808 goto err;
809 }
810
811 field_bits = BN_num_bits(p);
812 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
813 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
814 goto err;
815 }
816
817 /* create the EC_GROUP structure */
818 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
819 } else {
820 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
821 goto err;
822 }
823
824 if (ret == NULL) {
825 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
826 goto err;
827 }
828
829 /* extract seed (optional) */
830 if (params->curve->seed != NULL) {
831 OPENSSL_free(ret->seed);
832 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
833 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
834 goto err;
835 }
836 memcpy(ret->seed, params->curve->seed->data,
837 params->curve->seed->length);
838 ret->seed_len = params->curve->seed->length;
839 }
840
841 if (!params->order || !params->base || !params->base->data) {
842 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
843 goto err;
844 }
845
846 if ((point = EC_POINT_new(ret)) == NULL)
847 goto err;
848
849 /* set the point conversion form */
850 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
851 (params->base->data[0] & ~0x01));
852
853 /* extract the ec point */
854 if (!EC_POINT_oct2point(ret, point, params->base->data,
855 params->base->length, NULL)) {
856 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
857 goto err;
858 }
859
860 /* extract the order */
861 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
862 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
863 goto err;
864 }
865 if (BN_is_negative(a) || BN_is_zero(a)) {
866 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
867 goto err;
868 }
869 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
870 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
871 goto err;
872 }
873
874 /* extract the cofactor (optional) */
875 if (params->cofactor == NULL) {
876 BN_free(b);
877 b = NULL;
878 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
879 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
880 goto err;
881 }
882 /* set the generator, order and cofactor (if present) */
883 if (!EC_GROUP_set_generator(ret, point, a, b)) {
884 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
885 goto err;
886 }
887
888 ok = 1;
889
890 err:
891 if (!ok) {
892 EC_GROUP_clear_free(ret);
893 ret = NULL;
894 }
895
896 BN_free(p);
897 BN_free(a);
898 BN_free(b);
899 EC_POINT_free(point);
900 return (ret);
901 }
902
903 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
904 {
905 EC_GROUP *ret = NULL;
906 int tmp = 0;
907
908 if (params == NULL) {
909 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
910 return NULL;
911 }
912
913 if (params->type == 0) { /* the curve is given by an OID */
914 tmp = OBJ_obj2nid(params->value.named_curve);
915 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
916 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
917 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
918 return NULL;
919 }
920 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
921 } else if (params->type == 1) { /* the parameters are given by a
922 * ECPARAMETERS structure */
923 ret = ec_asn1_parameters2group(params->value.parameters);
924 if (!ret) {
925 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
926 return NULL;
927 }
928 EC_GROUP_set_asn1_flag(ret, 0x0);
929 } else if (params->type == 2) { /* implicitlyCA */
930 return NULL;
931 } else {
932 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
933 return NULL;
934 }
935
936 return ret;
937 }
938
939 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
940
941 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
942 {
943 EC_GROUP *group = NULL;
944 ECPKPARAMETERS *params = NULL;
945 const unsigned char *p = *in;
946
947 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
948 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
949 ECPKPARAMETERS_free(params);
950 return NULL;
951 }
952
953 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
954 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
955 ECPKPARAMETERS_free(params);
956 return NULL;
957 }
958
959 if (a) {
960 EC_GROUP_clear_free(*a);
961 *a = group;
962 }
963
964 ECPKPARAMETERS_free(params);
965 *in = p;
966 return (group);
967 }
968
969 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
970 {
971 int ret = 0;
972 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
973 if (tmp == NULL) {
974 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
975 return 0;
976 }
977 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
978 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
979 ECPKPARAMETERS_free(tmp);
980 return 0;
981 }
982 ECPKPARAMETERS_free(tmp);
983 return (ret);
984 }
985
986 /* some EC_KEY functions */
987
988 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
989 {
990 EC_KEY *ret = NULL;
991 EC_PRIVATEKEY *priv_key = NULL;
992 const unsigned char *p = *in;
993
994 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
995 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
996 return NULL;
997 }
998
999 if (a == NULL || *a == NULL) {
1000 if ((ret = EC_KEY_new()) == NULL) {
1001 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1002 goto err;
1003 }
1004 } else
1005 ret = *a;
1006
1007 if (priv_key->parameters) {
1008 EC_GROUP_clear_free(ret->group);
1009 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1010 }
1011
1012 if (ret->group == NULL) {
1013 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1014 goto err;
1015 }
1016
1017 ret->version = priv_key->version;
1018
1019 if (priv_key->privateKey) {
1020 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
1021 if (EC_KEY_oct2priv(ret, ASN1_STRING_data(pkey),
1022 ASN1_STRING_length(pkey)) == 0)
1023 goto err;
1024 } else {
1025 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1026 goto err;
1027 }
1028
1029 EC_POINT_clear_free(ret->pub_key);
1030 ret->pub_key = EC_POINT_new(ret->group);
1031 if (ret->pub_key == NULL) {
1032 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1033 goto err;
1034 }
1035
1036 if (priv_key->publicKey) {
1037 const unsigned char *pub_oct;
1038 int pub_oct_len;
1039
1040 pub_oct = ASN1_STRING_data(priv_key->publicKey);
1041 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1042 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
1043 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1044 goto err;
1045 }
1046 } else {
1047 if (ret->group->meth->keygenpub != NULL) {
1048 if (ret->group->meth->keygenpub(ret) == 0)
1049 goto err;
1050 } else if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key, NULL,
1051 NULL, NULL)) {
1052 goto err;
1053 }
1054 /* Remember the original private-key-only encoding. */
1055 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1056 }
1057
1058 if (a)
1059 *a = ret;
1060 EC_PRIVATEKEY_free(priv_key);
1061 *in = p;
1062 return (ret);
1063
1064 err:
1065 if (a == NULL || *a != ret)
1066 EC_KEY_free(ret);
1067 EC_PRIVATEKEY_free(priv_key);
1068 return NULL;
1069 }
1070
1071 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1072 {
1073 int ret = 0, ok = 0;
1074 unsigned char *priv= NULL, *pub= NULL;
1075 size_t privlen = 0, publen = 0;
1076
1077 EC_PRIVATEKEY *priv_key = NULL;
1078
1079 if (a == NULL || a->group == NULL ||
1080 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1081 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1082 goto err;
1083 }
1084
1085 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1086 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1087 goto err;
1088 }
1089
1090 priv_key->version = a->version;
1091
1092 privlen = EC_KEY_priv2buf(a, &priv);
1093
1094 if (privlen == 0) {
1095 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1096 goto err;
1097 }
1098
1099 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1100 priv = NULL;
1101
1102 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1103 if ((priv_key->parameters =
1104 ec_asn1_group2pkparameters(a->group,
1105 priv_key->parameters)) == NULL) {
1106 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1107 goto err;
1108 }
1109 }
1110
1111 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1112 priv_key->publicKey = ASN1_BIT_STRING_new();
1113 if (priv_key->publicKey == NULL) {
1114 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1115 goto err;
1116 }
1117
1118 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1119
1120 if (publen == 0) {
1121 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1122 goto err;
1123 }
1124
1125 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1126 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1127 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1128 pub = NULL;
1129 }
1130
1131 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1132 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1133 goto err;
1134 }
1135 ok = 1;
1136 err:
1137 OPENSSL_clear_free(priv, privlen);
1138 OPENSSL_free(pub);
1139 EC_PRIVATEKEY_free(priv_key);
1140 return (ok ? ret : 0);
1141 }
1142
1143 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1144 {
1145 if (a == NULL) {
1146 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1147 return 0;
1148 }
1149 return i2d_ECPKParameters(a->group, out);
1150 }
1151
1152 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1153 {
1154 EC_KEY *ret;
1155
1156 if (in == NULL || *in == NULL) {
1157 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1158 return NULL;
1159 }
1160
1161 if (a == NULL || *a == NULL) {
1162 if ((ret = EC_KEY_new()) == NULL) {
1163 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1164 return NULL;
1165 }
1166 } else
1167 ret = *a;
1168
1169 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1170 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1171 if (a == NULL || *a != ret)
1172 EC_KEY_free(ret);
1173 return NULL;
1174 }
1175
1176 if (a)
1177 *a = ret;
1178
1179 return ret;
1180 }
1181
1182 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1183 {
1184 EC_KEY *ret = NULL;
1185
1186 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1187 /*
1188 * sorry, but a EC_GROUP-structure is necessary to set the public key
1189 */
1190 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1191 return 0;
1192 }
1193 ret = *a;
1194 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1195 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1196 return 0;
1197 }
1198 *in += len;
1199 return ret;
1200 }
1201
1202 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1203 {
1204 size_t buf_len = 0;
1205 int new_buffer = 0;
1206
1207 if (a == NULL) {
1208 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1209 return 0;
1210 }
1211
1212 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1213 a->conv_form, NULL, 0, NULL);
1214
1215 if (out == NULL || buf_len == 0)
1216 /* out == NULL => just return the length of the octet string */
1217 return buf_len;
1218
1219 if (*out == NULL) {
1220 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1221 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1222 return 0;
1223 }
1224 new_buffer = 1;
1225 }
1226 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1227 *out, buf_len, NULL)) {
1228 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1229 if (new_buffer) {
1230 OPENSSL_free(*out);
1231 *out = NULL;
1232 }
1233 return 0;
1234 }
1235 if (!new_buffer)
1236 *out += buf_len;
1237 return buf_len;
1238 }
1239
1240 ASN1_SEQUENCE(ECDSA_SIG) = {
1241 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1242 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1243 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1244
1245 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1246 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1247 IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG)
1248
1249 void ECDSA_SIG_get0(BIGNUM **pr, BIGNUM **ps, ECDSA_SIG *sig)
1250 {
1251 if (pr != NULL)
1252 *pr = sig->r;
1253 if (ps != NULL)
1254 *ps = sig->s;
1255 }
1256
1257 int ECDSA_size(const EC_KEY *r)
1258 {
1259 int ret, i;
1260 ASN1_INTEGER bs;
1261 unsigned char buf[4];
1262 const EC_GROUP *group;
1263
1264 if (r == NULL)
1265 return 0;
1266 group = EC_KEY_get0_group(r);
1267 if (group == NULL)
1268 return 0;
1269
1270 i = EC_GROUP_order_bits(group);
1271 if (i == 0)
1272 return 0;
1273 bs.length = (i + 7) / 8;
1274 bs.data = buf;
1275 bs.type = V_ASN1_INTEGER;
1276 /* If the top bit is set the asn1 encoding is 1 larger. */
1277 buf[0] = 0xff;
1278
1279 i = i2d_ASN1_INTEGER(&bs, NULL);
1280 i += i; /* r and s */
1281 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1282 return (ret);
1283 }
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