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Fix a failure to NULL a pointer freed on error.
[thirdparty/openssl.git] / crypto / ec / ec_asn1.c
1 /* crypto/ec/ec_asn1.c */
2 /*
3 * Written by Nils Larsch for the OpenSSL project.
4 */
5 /* ====================================================================
6 * Copyright (c) 2000-2003 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59 #include <string.h>
60 #include "ec_lcl.h"
61 #include <openssl/err.h>
62 #include <openssl/asn1t.h>
63 #include <openssl/objects.h>
64
65 int EC_GROUP_get_basis_type(const EC_GROUP *group)
66 {
67 int i = 0;
68
69 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
70 NID_X9_62_characteristic_two_field)
71 /* everything else is currently not supported */
72 return 0;
73
74 while (group->poly[i] != 0)
75 i++;
76
77 if (i == 4)
78 return NID_X9_62_ppBasis;
79 else if (i == 2)
80 return NID_X9_62_tpBasis;
81 else
82 /* everything else is currently not supported */
83 return 0;
84 }
85
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_GROUP_method_of(group)->group_set_curve !=
92 ec_GF2m_simple_group_set_curve || !((group->poly[0] != 0)
93 && (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_GROUP_method_of(group)->group_set_curve !=
113 ec_GF2m_simple_group_set_curve || !((group->poly[0] != 0)
114 && (group->poly[1] != 0)
115 && (group->poly[2] != 0)
116 && (group->poly[3] != 0)
117 && (group->poly[4] == 0))) {
118 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
119 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
120 return 0;
121 }
122
123 if (k1)
124 *k1 = group->poly[3];
125 if (k2)
126 *k2 = group->poly[2];
127 if (k3)
128 *k3 = group->poly[1];
129
130 return 1;
131 }
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 } 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 } 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 } 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 } 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 } 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 } 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 } 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 if (field->fieldType != NULL)
320 ASN1_OBJECT_free(field->fieldType);
321 if (field->p.other != NULL)
322 ASN1_TYPE_free(field->p.other);
323
324 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
325 /* set OID for the field */
326 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
327 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
328 goto err;
329 }
330
331 if (nid == NID_X9_62_prime_field) {
332 if ((tmp = BN_new()) == NULL) {
333 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
334 goto err;
335 }
336 /* the parameters are specified by the prime number p */
337 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
338 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
339 goto err;
340 }
341 /* set the prime number */
342 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
343 if (field->p.prime == NULL) {
344 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
345 goto err;
346 }
347 } else { /* nid == NID_X9_62_characteristic_two_field */
348
349 int field_type;
350 X9_62_CHARACTERISTIC_TWO *char_two;
351
352 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
353 char_two = field->p.char_two;
354
355 if (char_two == NULL) {
356 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
357 goto err;
358 }
359
360 char_two->m = (long)EC_GROUP_get_degree(group);
361
362 field_type = EC_GROUP_get_basis_type(group);
363
364 if (field_type == 0) {
365 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
366 goto err;
367 }
368 /* set base type OID */
369 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
370 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
371 goto err;
372 }
373
374 if (field_type == NID_X9_62_tpBasis) {
375 unsigned int k;
376
377 if (!EC_GROUP_get_trinomial_basis(group, &k))
378 goto err;
379
380 char_two->p.tpBasis = ASN1_INTEGER_new();
381 if (!char_two->p.tpBasis) {
382 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
383 goto err;
384 }
385 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
386 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
387 goto err;
388 }
389 } else if (field_type == NID_X9_62_ppBasis) {
390 unsigned int k1, k2, k3;
391
392 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
393 goto err;
394
395 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
396 if (!char_two->p.ppBasis) {
397 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
398 goto err;
399 }
400
401 /* set k? values */
402 char_two->p.ppBasis->k1 = (long)k1;
403 char_two->p.ppBasis->k2 = (long)k2;
404 char_two->p.ppBasis->k3 = (long)k3;
405 } else { /* field_type == NID_X9_62_onBasis */
406
407 /* for ONB the parameters are (asn1) NULL */
408 char_two->p.onBasis = ASN1_NULL_new();
409 if (!char_two->p.onBasis) {
410 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
411 goto err;
412 }
413 }
414 }
415
416 ok = 1;
417
418 err:if (tmp)
419 BN_free(tmp);
420 return (ok);
421 }
422
423 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
424 {
425 int ok = 0, nid;
426 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
427 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
428 *a_buf = NULL, *b_buf = NULL;
429 size_t len_1, len_2;
430 unsigned char char_zero = 0;
431
432 if (!group || !curve || !curve->a || !curve->b)
433 return 0;
434
435 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
436 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
437 goto err;
438 }
439
440 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
441
442 /* get a and b */
443 if (nid == NID_X9_62_prime_field) {
444 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
445 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
446 goto err;
447 }
448 } else { /* nid == NID_X9_62_characteristic_two_field */
449
450 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
451 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
452 goto err;
453 }
454 }
455
456 len_1 = (size_t)BN_num_bytes(tmp_1);
457 len_2 = (size_t)BN_num_bytes(tmp_2);
458
459 if (len_1 == 0) {
460 /* len_1 == 0 => a == 0 */
461 a_buf = &char_zero;
462 len_1 = 1;
463 } else {
464 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
465 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
466 goto err;
467 }
468 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
469 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
470 goto err;
471 }
472 a_buf = buffer_1;
473 }
474
475 if (len_2 == 0) {
476 /* len_2 == 0 => b == 0 */
477 b_buf = &char_zero;
478 len_2 = 1;
479 } else {
480 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
481 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
482 goto err;
483 }
484 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
485 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
486 goto err;
487 }
488 b_buf = buffer_2;
489 }
490
491 /* set a and b */
492 if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
493 !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
494 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
495 goto err;
496 }
497
498 /* set the seed (optional) */
499 if (group->seed) {
500 if (!curve->seed)
501 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
502 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
503 goto err;
504 }
505 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
506 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
507 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
508 (int)group->seed_len)) {
509 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
510 goto err;
511 }
512 } else {
513 if (curve->seed) {
514 ASN1_BIT_STRING_free(curve->seed);
515 curve->seed = NULL;
516 }
517 }
518
519 ok = 1;
520
521 err:if (buffer_1)
522 OPENSSL_free(buffer_1);
523 if (buffer_2)
524 OPENSSL_free(buffer_2);
525 if (tmp_1)
526 BN_free(tmp_1);
527 if (tmp_2)
528 BN_free(tmp_2);
529 return (ok);
530 }
531
532 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
533 ECPARAMETERS *param)
534 {
535 int ok = 0;
536 size_t len = 0;
537 ECPARAMETERS *ret = NULL;
538 BIGNUM *tmp = NULL;
539 unsigned char *buffer = NULL;
540 const EC_POINT *point = NULL;
541 point_conversion_form_t form;
542
543 if ((tmp = BN_new()) == NULL) {
544 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
545 goto err;
546 }
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_point2oct(group, point, form, NULL, len, NULL);
580 if (len == 0) {
581 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
582 goto err;
583 }
584 if ((buffer = OPENSSL_malloc(len)) == NULL) {
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
586 goto err;
587 }
588 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
589 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
590 goto err;
591 }
592 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
593 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
594 goto err;
595 }
596 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
597 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
598 goto err;
599 }
600
601 /* set the order */
602 if (!EC_GROUP_get_order(group, tmp, NULL)) {
603 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
604 goto err;
605 }
606 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
607 if (ret->order == NULL) {
608 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
609 goto err;
610 }
611
612 /* set the cofactor (optional) */
613 if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
614 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
615 if (ret->cofactor == NULL) {
616 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
617 goto err;
618 }
619 }
620
621 ok = 1;
622
623 err:if (!ok) {
624 if (ret && !param)
625 ECPARAMETERS_free(ret);
626 ret = NULL;
627 }
628 if (tmp)
629 BN_free(tmp);
630 if (buffer)
631 OPENSSL_free(buffer);
632 return (ret);
633 }
634
635 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
636 ECPKPARAMETERS *params)
637 {
638 int ok = 1, tmp;
639 ECPKPARAMETERS *ret = params;
640
641 if (ret == NULL) {
642 if ((ret = ECPKPARAMETERS_new()) == NULL) {
643 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
644 return NULL;
645 }
646 } else {
647 if (ret->type == 0 && ret->value.named_curve)
648 ASN1_OBJECT_free(ret->value.named_curve);
649 else if (ret->type == 1 && ret->value.parameters)
650 ECPARAMETERS_free(ret->value.parameters);
651 }
652
653 if (EC_GROUP_get_asn1_flag(group)) {
654 /*
655 * use the asn1 OID to describe the the elliptic curve parameters
656 */
657 tmp = EC_GROUP_get_curve_name(group);
658 if (tmp) {
659 ret->type = 0;
660 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
661 ok = 0;
662 } else
663 /* we don't kmow the nid => ERROR */
664 ok = 0;
665 } else {
666 /* use the ECPARAMETERS structure */
667 ret->type = 1;
668 if ((ret->value.parameters =
669 ec_asn1_group2parameters(group, NULL)) == NULL)
670 ok = 0;
671 }
672
673 if (!ok) {
674 ECPKPARAMETERS_free(ret);
675 return NULL;
676 }
677 return ret;
678 }
679
680 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
681 {
682 int ok = 0, tmp;
683 EC_GROUP *ret = NULL;
684 BIGNUM *p = NULL, *a = NULL, *b = NULL;
685 EC_POINT *point = NULL;
686 long field_bits;
687
688 if (!params->fieldID || !params->fieldID->fieldType ||
689 !params->fieldID->p.ptr) {
690 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
691 goto err;
692 }
693
694 /* now extract the curve parameters a and b */
695 if (!params->curve || !params->curve->a ||
696 !params->curve->a->data || !params->curve->b ||
697 !params->curve->b->data) {
698 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
699 goto err;
700 }
701 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
702 if (a == NULL) {
703 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
704 goto err;
705 }
706 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
707 if (b == NULL) {
708 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
709 goto err;
710 }
711
712 /* get the field parameters */
713 tmp = OBJ_obj2nid(params->fieldID->fieldType);
714
715 if (tmp == NID_X9_62_characteristic_two_field) {
716 X9_62_CHARACTERISTIC_TWO *char_two;
717
718 char_two = params->fieldID->p.char_two;
719
720 field_bits = char_two->m;
721 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
722 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
723 goto err;
724 }
725
726 if ((p = BN_new()) == NULL) {
727 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
728 goto err;
729 }
730
731 /* get the base type */
732 tmp = OBJ_obj2nid(char_two->type);
733
734 if (tmp == NID_X9_62_tpBasis) {
735 long tmp_long;
736
737 if (!char_two->p.tpBasis) {
738 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
739 goto err;
740 }
741
742 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
743
744 if (!(char_two->m > tmp_long && tmp_long > 0)) {
745 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
746 EC_R_INVALID_TRINOMIAL_BASIS);
747 goto err;
748 }
749
750 /* create the polynomial */
751 if (!BN_set_bit(p, (int)char_two->m))
752 goto err;
753 if (!BN_set_bit(p, (int)tmp_long))
754 goto err;
755 if (!BN_set_bit(p, 0))
756 goto err;
757 } else if (tmp == NID_X9_62_ppBasis) {
758 X9_62_PENTANOMIAL *penta;
759
760 penta = char_two->p.ppBasis;
761 if (!penta) {
762 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
763 goto err;
764 }
765
766 if (!
767 (char_two->m > penta->k3 && penta->k3 > penta->k2
768 && penta->k2 > penta->k1 && penta->k1 > 0)) {
769 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
770 EC_R_INVALID_PENTANOMIAL_BASIS);
771 goto err;
772 }
773
774 /* create the polynomial */
775 if (!BN_set_bit(p, (int)char_two->m))
776 goto err;
777 if (!BN_set_bit(p, (int)penta->k1))
778 goto err;
779 if (!BN_set_bit(p, (int)penta->k2))
780 goto err;
781 if (!BN_set_bit(p, (int)penta->k3))
782 goto err;
783 if (!BN_set_bit(p, 0))
784 goto err;
785 } else if (tmp == NID_X9_62_onBasis) {
786 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
787 goto err;
788 } else { /* error */
789
790 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
791 goto err;
792 }
793
794 /* create the EC_GROUP structure */
795 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
796 } else if (tmp == NID_X9_62_prime_field) {
797 /* we have a curve over a prime field */
798 /* extract the prime number */
799 if (!params->fieldID->p.prime) {
800 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
801 goto err;
802 }
803 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
804 if (p == NULL) {
805 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
806 goto err;
807 }
808
809 if (BN_is_negative(p) || BN_is_zero(p)) {
810 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
811 goto err;
812 }
813
814 field_bits = BN_num_bits(p);
815 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
816 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
817 goto err;
818 }
819
820 /* create the EC_GROUP structure */
821 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
822 } else {
823 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
824 goto err;
825 }
826
827 if (ret == NULL) {
828 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
829 goto err;
830 }
831
832 /* extract seed (optional) */
833 if (params->curve->seed != NULL) {
834 if (ret->seed != NULL)
835 OPENSSL_free(ret->seed);
836 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) {
837 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
838 goto err;
839 }
840 memcpy(ret->seed, params->curve->seed->data,
841 params->curve->seed->length);
842 ret->seed_len = params->curve->seed->length;
843 }
844
845 if (!params->order || !params->base || !params->base->data) {
846 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
847 goto err;
848 }
849
850 if ((point = EC_POINT_new(ret)) == NULL)
851 goto err;
852
853 /* set the point conversion form */
854 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
855 (params->base->data[0] & ~0x01));
856
857 /* extract the ec point */
858 if (!EC_POINT_oct2point(ret, point, params->base->data,
859 params->base->length, NULL)) {
860 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
861 goto err;
862 }
863
864 /* extract the order */
865 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
866 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
867 goto err;
868 }
869 if (BN_is_negative(a) || BN_is_zero(a)) {
870 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
871 goto err;
872 }
873 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
874 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
875 goto err;
876 }
877
878 /* extract the cofactor (optional) */
879 if (params->cofactor == NULL) {
880 if (b) {
881 BN_free(b);
882 b = NULL;
883 }
884 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
885 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
886 goto err;
887 }
888 /* set the generator, order and cofactor (if present) */
889 if (!EC_GROUP_set_generator(ret, point, a, b)) {
890 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
891 goto err;
892 }
893
894 ok = 1;
895
896 err:if (!ok) {
897 if (ret)
898 EC_GROUP_clear_free(ret);
899 ret = NULL;
900 }
901
902 if (p)
903 BN_free(p);
904 if (a)
905 BN_free(a);
906 if (b)
907 BN_free(b);
908 if (point)
909 EC_POINT_free(point);
910 return (ret);
911 }
912
913 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
914 {
915 EC_GROUP *ret = NULL;
916 int tmp = 0;
917
918 if (params == NULL) {
919 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
920 return NULL;
921 }
922
923 if (params->type == 0) { /* the curve is given by an OID */
924 tmp = OBJ_obj2nid(params->value.named_curve);
925 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
926 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
927 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
928 return NULL;
929 }
930 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
931 } else if (params->type == 1) { /* the parameters are given by a
932 * ECPARAMETERS structure */
933 ret = ec_asn1_parameters2group(params->value.parameters);
934 if (!ret) {
935 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
936 return NULL;
937 }
938 EC_GROUP_set_asn1_flag(ret, 0x0);
939 } else if (params->type == 2) { /* implicitlyCA */
940 return NULL;
941 } else {
942 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
943 return NULL;
944 }
945
946 return ret;
947 }
948
949 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
950
951 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
952 {
953 EC_GROUP *group = NULL;
954 ECPKPARAMETERS *params = NULL;
955
956 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) {
957 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
958 ECPKPARAMETERS_free(params);
959 return NULL;
960 }
961
962 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
963 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
964 return NULL;
965 }
966
967 if (a && *a)
968 EC_GROUP_clear_free(*a);
969 if (a)
970 *a = group;
971
972 ECPKPARAMETERS_free(params);
973 return (group);
974 }
975
976 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
977 {
978 int ret = 0;
979 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
980 if (tmp == NULL) {
981 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
982 return 0;
983 }
984 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
985 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
986 ECPKPARAMETERS_free(tmp);
987 return 0;
988 }
989 ECPKPARAMETERS_free(tmp);
990 return (ret);
991 }
992
993 /* some EC_KEY functions */
994
995 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
996 {
997 int ok = 0;
998 EC_KEY *ret = NULL;
999 EC_PRIVATEKEY *priv_key = NULL;
1000
1001 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1002 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1003 return NULL;
1004 }
1005
1006 if ((priv_key = d2i_EC_PRIVATEKEY(&priv_key, in, len)) == NULL) {
1007 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1008 EC_PRIVATEKEY_free(priv_key);
1009 return NULL;
1010 }
1011
1012 if (a == NULL || *a == NULL) {
1013 if ((ret = EC_KEY_new()) == NULL) {
1014 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1015 goto err;
1016 }
1017 } else
1018 ret = *a;
1019
1020 if (priv_key->parameters) {
1021 if (ret->group)
1022 EC_GROUP_clear_free(ret->group);
1023 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1024 }
1025
1026 if (ret->group == NULL) {
1027 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1028 goto err;
1029 }
1030
1031 ret->version = priv_key->version;
1032
1033 if (priv_key->privateKey) {
1034 ret->priv_key = BN_bin2bn(M_ASN1_STRING_data(priv_key->privateKey),
1035 M_ASN1_STRING_length(priv_key->privateKey),
1036 ret->priv_key);
1037 if (ret->priv_key == NULL) {
1038 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
1039 goto err;
1040 }
1041 } else {
1042 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1043 goto err;
1044 }
1045
1046 if (priv_key->publicKey) {
1047 const unsigned char *pub_oct;
1048 size_t pub_oct_len;
1049
1050 if (ret->pub_key)
1051 EC_POINT_clear_free(ret->pub_key);
1052 ret->pub_key = EC_POINT_new(ret->group);
1053 if (ret->pub_key == NULL) {
1054 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1055 goto err;
1056 }
1057 pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
1058 pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
1059 /* save the point conversion form */
1060 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1061 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1062 pub_oct, pub_oct_len, NULL)) {
1063 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1064 goto err;
1065 }
1066 }
1067
1068 if (a)
1069 *a = ret;
1070 ok = 1;
1071 err:
1072 if (!ok) {
1073 if (ret && (a == NULL || *a != ret))
1074 EC_KEY_free(ret);
1075 ret = NULL;
1076 }
1077
1078 if (priv_key)
1079 EC_PRIVATEKEY_free(priv_key);
1080
1081 return (ret);
1082 }
1083
1084 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1085 {
1086 int ret = 0, ok = 0;
1087 unsigned char *buffer = NULL;
1088 size_t buf_len = 0, tmp_len;
1089 EC_PRIVATEKEY *priv_key = NULL;
1090
1091 if (a == NULL || a->group == NULL || a->priv_key == NULL) {
1092 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1093 goto err;
1094 }
1095
1096 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1097 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1098 goto err;
1099 }
1100
1101 priv_key->version = a->version;
1102
1103 buf_len = (size_t)BN_num_bytes(a->priv_key);
1104 buffer = OPENSSL_malloc(buf_len);
1105 if (buffer == NULL) {
1106 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1107 goto err;
1108 }
1109
1110 if (!BN_bn2bin(a->priv_key, buffer)) {
1111 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1112 goto err;
1113 }
1114
1115 if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
1116 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1117 goto err;
1118 }
1119
1120 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1121 if ((priv_key->parameters =
1122 ec_asn1_group2pkparameters(a->group,
1123 priv_key->parameters)) == NULL) {
1124 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1125 goto err;
1126 }
1127 }
1128
1129 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1130 priv_key->publicKey = M_ASN1_BIT_STRING_new();
1131 if (priv_key->publicKey == NULL) {
1132 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1133 goto err;
1134 }
1135
1136 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1137 a->conv_form, NULL, 0, NULL);
1138
1139 if (tmp_len > buf_len) {
1140 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1141 if (!tmp_buffer) {
1142 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1143 goto err;
1144 }
1145 buffer = tmp_buffer;
1146 buf_len = tmp_len;
1147 }
1148
1149 if (!EC_POINT_point2oct(a->group, a->pub_key,
1150 a->conv_form, buffer, buf_len, NULL)) {
1151 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1152 goto err;
1153 }
1154
1155 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1156 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1157 if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
1158 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1159 goto err;
1160 }
1161 }
1162
1163 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1164 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1165 goto err;
1166 }
1167 ok = 1;
1168 err:
1169 if (buffer)
1170 OPENSSL_free(buffer);
1171 if (priv_key)
1172 EC_PRIVATEKEY_free(priv_key);
1173 return (ok ? ret : 0);
1174 }
1175
1176 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1177 {
1178 if (a == NULL) {
1179 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1180 return 0;
1181 }
1182 return i2d_ECPKParameters(a->group, out);
1183 }
1184
1185 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1186 {
1187 EC_KEY *ret;
1188
1189 if (in == NULL || *in == NULL) {
1190 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1191 return NULL;
1192 }
1193
1194 if (a == NULL || *a == NULL) {
1195 if ((ret = EC_KEY_new()) == NULL) {
1196 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1197 return NULL;
1198 }
1199 } else
1200 ret = *a;
1201
1202 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1203 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1204 if (a == NULL || *a != ret)
1205 EC_KEY_free(ret);
1206 return NULL;
1207 }
1208
1209 if (a)
1210 *a = ret;
1211
1212 return ret;
1213 }
1214
1215 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1216 {
1217 EC_KEY *ret = NULL;
1218
1219 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1220 /*
1221 * sorry, but a EC_GROUP-structur is necessary to set the public key
1222 */
1223 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1224 return 0;
1225 }
1226 ret = *a;
1227 if (ret->pub_key == NULL &&
1228 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1229 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1230 return 0;
1231 }
1232 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1233 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1234 return 0;
1235 }
1236 /* save the point conversion form */
1237 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1238 *in += len;
1239 return ret;
1240 }
1241
1242 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1243 {
1244 size_t buf_len = 0;
1245 int new_buffer = 0;
1246
1247 if (a == NULL) {
1248 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1249 return 0;
1250 }
1251
1252 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1253 a->conv_form, NULL, 0, NULL);
1254
1255 if (out == NULL || buf_len == 0)
1256 /* out == NULL => just return the length of the octet string */
1257 return buf_len;
1258
1259 if (*out == NULL) {
1260 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1261 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1262 return 0;
1263 }
1264 new_buffer = 1;
1265 }
1266 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1267 *out, buf_len, NULL)) {
1268 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1269 OPENSSL_free(*out);
1270 *out = NULL;
1271 return 0;
1272 }
1273 if (!new_buffer)
1274 *out += buf_len;
1275 return buf_len;
1276 }
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