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[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 #ifndef OPENSSL_NO_EC2M
87 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
88 {
89 if (group == NULL)
90 return 0;
91
92 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
93 NID_X9_62_characteristic_two_field
94 || !((group->poly[0] != 0) && (group->poly[1] != 0)
95 && (group->poly[2] == 0))) {
96 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
97 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
98 return 0;
99 }
100
101 if (k)
102 *k = group->poly[1];
103
104 return 1;
105 }
106
107 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
108 unsigned int *k2, unsigned int *k3)
109 {
110 if (group == NULL)
111 return 0;
112
113 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
114 NID_X9_62_characteristic_two_field
115 || !((group->poly[0] != 0) && (group->poly[1] != 0)
116 && (group->poly[2] != 0) && (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 #endif
133
134 /* some structures needed for the asn1 encoding */
135 typedef struct x9_62_pentanomial_st {
136 long k1;
137 long k2;
138 long k3;
139 } X9_62_PENTANOMIAL;
140
141 typedef struct x9_62_characteristic_two_st {
142 long m;
143 ASN1_OBJECT *type;
144 union {
145 char *ptr;
146 /* NID_X9_62_onBasis */
147 ASN1_NULL *onBasis;
148 /* NID_X9_62_tpBasis */
149 ASN1_INTEGER *tpBasis;
150 /* NID_X9_62_ppBasis */
151 X9_62_PENTANOMIAL *ppBasis;
152 /* anything else */
153 ASN1_TYPE *other;
154 } p;
155 } X9_62_CHARACTERISTIC_TWO;
156
157 typedef struct x9_62_fieldid_st {
158 ASN1_OBJECT *fieldType;
159 union {
160 char *ptr;
161 /* NID_X9_62_prime_field */
162 ASN1_INTEGER *prime;
163 /* NID_X9_62_characteristic_two_field */
164 X9_62_CHARACTERISTIC_TWO *char_two;
165 /* anything else */
166 ASN1_TYPE *other;
167 } p;
168 } X9_62_FIELDID;
169
170 typedef struct x9_62_curve_st {
171 ASN1_OCTET_STRING *a;
172 ASN1_OCTET_STRING *b;
173 ASN1_BIT_STRING *seed;
174 } X9_62_CURVE;
175
176 typedef struct ec_parameters_st {
177 long version;
178 X9_62_FIELDID *fieldID;
179 X9_62_CURVE *curve;
180 ASN1_OCTET_STRING *base;
181 ASN1_INTEGER *order;
182 ASN1_INTEGER *cofactor;
183 } ECPARAMETERS;
184
185 struct ecpk_parameters_st {
186 int type;
187 union {
188 ASN1_OBJECT *named_curve;
189 ECPARAMETERS *parameters;
190 ASN1_NULL *implicitlyCA;
191 } value;
192 } /* ECPKPARAMETERS */ ;
193
194 /* SEC1 ECPrivateKey */
195 typedef struct ec_privatekey_st {
196 long version;
197 ASN1_OCTET_STRING *privateKey;
198 ECPKPARAMETERS *parameters;
199 ASN1_BIT_STRING *publicKey;
200 } EC_PRIVATEKEY;
201
202 /* the OpenSSL ASN.1 definitions */
203 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
204 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
205 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
206 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
207 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
208
209 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
210 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
211
212 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
213
214 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
215 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
216 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
217 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
218 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
219
220 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
221 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
222 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
223 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
224 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
225
226 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
227 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
228
229 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
230
231 ASN1_ADB(X9_62_FIELDID) = {
232 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
233 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
234 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
235
236 ASN1_SEQUENCE(X9_62_FIELDID) = {
237 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
238 ASN1_ADB_OBJECT(X9_62_FIELDID)
239 } ASN1_SEQUENCE_END(X9_62_FIELDID)
240
241 ASN1_SEQUENCE(X9_62_CURVE) = {
242 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
243 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
244 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
245 } ASN1_SEQUENCE_END(X9_62_CURVE)
246
247 ASN1_SEQUENCE(ECPARAMETERS) = {
248 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
249 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
250 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
251 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
252 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
253 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
254 } ASN1_SEQUENCE_END(ECPARAMETERS)
255
256 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
257 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
258
259 ASN1_CHOICE(ECPKPARAMETERS) = {
260 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
261 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
262 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
263 } ASN1_CHOICE_END(ECPKPARAMETERS)
264
265 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
266 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
267 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
268
269 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
270 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
271 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
272 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
273 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
274 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
275
276 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
277 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
278 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
279
280 /* some declarations of internal function */
281
282 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
283 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
284 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
285 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
286 /*
287 * ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
288 * object
289 */
290 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
291 /*
292 * ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
293 * object
294 */
295 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
296 ECPARAMETERS *);
297 /*
298 * ec_asn1_pkparameters2group() creates a EC_GROUP object from a
299 * ECPKPARAMETERS object
300 */
301 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
302 /*
303 * ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
304 * EC_GROUP object
305 */
306 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
307 ECPKPARAMETERS *);
308
309 /* the function definitions */
310
311 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
312 {
313 int ok = 0, nid;
314 BIGNUM *tmp = NULL;
315
316 if (group == NULL || field == NULL)
317 return 0;
318
319 /* clear the old values (if necessary) */
320 ASN1_OBJECT_free(field->fieldType);
321 ASN1_TYPE_free(field->p.other);
322
323 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
324 /* set OID for the field */
325 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
326 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
327 goto err;
328 }
329
330 if (nid == NID_X9_62_prime_field) {
331 if ((tmp = BN_new()) == NULL) {
332 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
333 goto err;
334 }
335 /* the parameters are specified by the prime number p */
336 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
337 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
338 goto err;
339 }
340 /* set the prime number */
341 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
342 if (field->p.prime == NULL) {
343 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
344 goto err;
345 }
346 } else /* nid == NID_X9_62_characteristic_two_field */
347 #ifdef OPENSSL_NO_EC2M
348 {
349 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
350 goto err;
351 }
352 #else
353 {
354 int field_type;
355 X9_62_CHARACTERISTIC_TWO *char_two;
356
357 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
358 char_two = field->p.char_two;
359
360 if (char_two == NULL) {
361 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
362 goto err;
363 }
364
365 char_two->m = (long)EC_GROUP_get_degree(group);
366
367 field_type = EC_GROUP_get_basis_type(group);
368
369 if (field_type == 0) {
370 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
371 goto err;
372 }
373 /* set base type OID */
374 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
375 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
376 goto err;
377 }
378
379 if (field_type == NID_X9_62_tpBasis) {
380 unsigned int k;
381
382 if (!EC_GROUP_get_trinomial_basis(group, &k))
383 goto err;
384
385 char_two->p.tpBasis = ASN1_INTEGER_new();
386 if (!char_two->p.tpBasis) {
387 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
388 goto err;
389 }
390 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
391 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
392 goto err;
393 }
394 } else if (field_type == NID_X9_62_ppBasis) {
395 unsigned int k1, k2, k3;
396
397 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
398 goto err;
399
400 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
401 if (!char_two->p.ppBasis) {
402 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
403 goto err;
404 }
405
406 /* set k? values */
407 char_two->p.ppBasis->k1 = (long)k1;
408 char_two->p.ppBasis->k2 = (long)k2;
409 char_two->p.ppBasis->k3 = (long)k3;
410 } else { /* field_type == NID_X9_62_onBasis */
411
412 /* for ONB the parameters are (asn1) NULL */
413 char_two->p.onBasis = ASN1_NULL_new();
414 if (!char_two->p.onBasis) {
415 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
416 goto err;
417 }
418 }
419 }
420 #endif
421
422 ok = 1;
423
424 err:
425 BN_free(tmp);
426 return (ok);
427 }
428
429 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
430 {
431 int ok = 0, nid;
432 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
433 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
434 *a_buf = NULL, *b_buf = NULL;
435 size_t len_1, len_2;
436 unsigned char char_zero = 0;
437
438 if (!group || !curve || !curve->a || !curve->b)
439 return 0;
440
441 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
442 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
443 goto err;
444 }
445
446 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
447
448 /* get a and b */
449 if (nid == NID_X9_62_prime_field) {
450 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
451 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
452 goto err;
453 }
454 }
455 #ifndef OPENSSL_NO_EC2M
456 else { /* nid == NID_X9_62_characteristic_two_field */
457
458 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
459 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
460 goto err;
461 }
462 }
463 #endif
464 len_1 = (size_t)BN_num_bytes(tmp_1);
465 len_2 = (size_t)BN_num_bytes(tmp_2);
466
467 if (len_1 == 0) {
468 /* len_1 == 0 => a == 0 */
469 a_buf = &char_zero;
470 len_1 = 1;
471 } else {
472 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
473 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
474 goto err;
475 }
476 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
477 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
478 goto err;
479 }
480 a_buf = buffer_1;
481 }
482
483 if (len_2 == 0) {
484 /* len_2 == 0 => b == 0 */
485 b_buf = &char_zero;
486 len_2 = 1;
487 } else {
488 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
489 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
490 goto err;
491 }
492 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
493 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
494 goto err;
495 }
496 b_buf = buffer_2;
497 }
498
499 /* set a and b */
500 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
501 !ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
502 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
503 goto err;
504 }
505
506 /* set the seed (optional) */
507 if (group->seed) {
508 if (!curve->seed)
509 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
510 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
511 goto err;
512 }
513 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
514 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
515 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
516 (int)group->seed_len)) {
517 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
518 goto err;
519 }
520 } else {
521 ASN1_BIT_STRING_free(curve->seed);
522 curve->seed = NULL;
523 }
524
525 ok = 1;
526
527 err:
528 if (buffer_1)
529 OPENSSL_free(buffer_1);
530 if (buffer_2)
531 OPENSSL_free(buffer_2);
532 BN_free(tmp_1);
533 BN_free(tmp_2);
534 return (ok);
535 }
536
537 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
538 ECPARAMETERS *param)
539 {
540 size_t len = 0;
541 ECPARAMETERS *ret = NULL;
542 BIGNUM *tmp = NULL;
543 unsigned char *buffer = NULL;
544 const EC_POINT *point = NULL;
545 point_conversion_form_t form;
546
547 if ((tmp = BN_new()) == NULL) {
548 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
549 goto err;
550 }
551
552 if (param == NULL) {
553 if ((ret = ECPARAMETERS_new()) == NULL) {
554 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
555 goto err;
556 }
557 } else
558 ret = param;
559
560 /* set the version (always one) */
561 ret->version = (long)0x1;
562
563 /* set the fieldID */
564 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
565 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
566 goto err;
567 }
568
569 /* set the curve */
570 if (!ec_asn1_group2curve(group, ret->curve)) {
571 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
572 goto err;
573 }
574
575 /* set the base point */
576 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
577 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
578 goto err;
579 }
580
581 form = EC_GROUP_get_point_conversion_form(group);
582
583 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
584 if (len == 0) {
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
586 goto err;
587 }
588 if ((buffer = OPENSSL_malloc(len)) == NULL) {
589 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
590 goto err;
591 }
592 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
593 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
594 goto err;
595 }
596 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
597 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
598 goto err;
599 }
600 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
601 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
602 goto err;
603 }
604
605 /* set the order */
606 if (!EC_GROUP_get_order(group, tmp, NULL)) {
607 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
608 goto err;
609 }
610 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
611 if (ret->order == NULL) {
612 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
613 goto err;
614 }
615
616 /* set the cofactor (optional) */
617 if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
618 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
619 if (ret->cofactor == NULL) {
620 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
621 goto err;
622 }
623 }
624
625 return ret;
626
627 err:
628 if (!param)
629 ECPARAMETERS_free(ret);
630 BN_free(tmp);
631 if (buffer)
632 OPENSSL_free(buffer);
633 return NULL;
634 }
635
636 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
637 ECPKPARAMETERS *params)
638 {
639 int ok = 1, tmp;
640 ECPKPARAMETERS *ret = params;
641
642 if (ret == NULL) {
643 if ((ret = ECPKPARAMETERS_new()) == NULL) {
644 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
645 return NULL;
646 }
647 } else {
648 if (ret->type == 0)
649 ASN1_OBJECT_free(ret->value.named_curve);
650 else if (ret->type == 1 && ret->value.parameters)
651 ECPARAMETERS_free(ret->value.parameters);
652 }
653
654 if (EC_GROUP_get_asn1_flag(group)) {
655 /*
656 * use the asn1 OID to describe the the elliptic curve parameters
657 */
658 tmp = EC_GROUP_get_curve_name(group);
659 if (tmp) {
660 ret->type = 0;
661 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
662 ok = 0;
663 } else
664 /* we don't kmow the nid => ERROR */
665 ok = 0;
666 } else {
667 /* use the ECPARAMETERS structure */
668 ret->type = 1;
669 if ((ret->value.parameters =
670 ec_asn1_group2parameters(group, NULL)) == NULL)
671 ok = 0;
672 }
673
674 if (!ok) {
675 ECPKPARAMETERS_free(ret);
676 return NULL;
677 }
678 return ret;
679 }
680
681 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
682 {
683 int ok = 0, tmp;
684 EC_GROUP *ret = NULL;
685 BIGNUM *p = NULL, *a = NULL, *b = NULL;
686 EC_POINT *point = NULL;
687 long field_bits;
688
689 if (!params->fieldID || !params->fieldID->fieldType ||
690 !params->fieldID->p.ptr) {
691 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
692 goto err;
693 }
694
695 /* now extract the curve parameters a and b */
696 if (!params->curve || !params->curve->a ||
697 !params->curve->a->data || !params->curve->b ||
698 !params->curve->b->data) {
699 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
700 goto err;
701 }
702 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
703 if (a == NULL) {
704 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
705 goto err;
706 }
707 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
708 if (b == NULL) {
709 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
710 goto err;
711 }
712
713 /* get the field parameters */
714 tmp = OBJ_obj2nid(params->fieldID->fieldType);
715 if (tmp == NID_X9_62_characteristic_two_field)
716 #ifdef OPENSSL_NO_EC2M
717 {
718 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
719 goto err;
720 }
721 #else
722 {
723 X9_62_CHARACTERISTIC_TWO *char_two;
724
725 char_two = params->fieldID->p.char_two;
726
727 field_bits = char_two->m;
728 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
729 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
730 goto err;
731 }
732
733 if ((p = BN_new()) == NULL) {
734 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
735 goto err;
736 }
737
738 /* get the base type */
739 tmp = OBJ_obj2nid(char_two->type);
740
741 if (tmp == NID_X9_62_tpBasis) {
742 long tmp_long;
743
744 if (!char_two->p.tpBasis) {
745 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
746 goto err;
747 }
748
749 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
750
751 if (!(char_two->m > tmp_long && tmp_long > 0)) {
752 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
753 EC_R_INVALID_TRINOMIAL_BASIS);
754 goto err;
755 }
756
757 /* create the polynomial */
758 if (!BN_set_bit(p, (int)char_two->m))
759 goto err;
760 if (!BN_set_bit(p, (int)tmp_long))
761 goto err;
762 if (!BN_set_bit(p, 0))
763 goto err;
764 } else if (tmp == NID_X9_62_ppBasis) {
765 X9_62_PENTANOMIAL *penta;
766
767 penta = char_two->p.ppBasis;
768 if (!penta) {
769 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
770 goto err;
771 }
772
773 if (!
774 (char_two->m > penta->k3 && penta->k3 > penta->k2
775 && penta->k2 > penta->k1 && penta->k1 > 0)) {
776 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
777 EC_R_INVALID_PENTANOMIAL_BASIS);
778 goto err;
779 }
780
781 /* create the polynomial */
782 if (!BN_set_bit(p, (int)char_two->m))
783 goto err;
784 if (!BN_set_bit(p, (int)penta->k1))
785 goto err;
786 if (!BN_set_bit(p, (int)penta->k2))
787 goto err;
788 if (!BN_set_bit(p, (int)penta->k3))
789 goto err;
790 if (!BN_set_bit(p, 0))
791 goto err;
792 } else if (tmp == NID_X9_62_onBasis) {
793 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
794 goto err;
795 } else { /* error */
796
797 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
798 goto err;
799 }
800
801 /* create the EC_GROUP structure */
802 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
803 }
804 #endif
805 else if (tmp == NID_X9_62_prime_field) {
806 /* we have a curve over a prime field */
807 /* extract the prime number */
808 if (!params->fieldID->p.prime) {
809 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
810 goto err;
811 }
812 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
813 if (p == NULL) {
814 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
815 goto err;
816 }
817
818 if (BN_is_negative(p) || BN_is_zero(p)) {
819 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
820 goto err;
821 }
822
823 field_bits = BN_num_bits(p);
824 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
825 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
826 goto err;
827 }
828
829 /* create the EC_GROUP structure */
830 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
831 } else {
832 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
833 goto err;
834 }
835
836 if (ret == NULL) {
837 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
838 goto err;
839 }
840
841 /* extract seed (optional) */
842 if (params->curve->seed != NULL) {
843 if (ret->seed != NULL)
844 OPENSSL_free(ret->seed);
845 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) {
846 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
847 goto err;
848 }
849 memcpy(ret->seed, params->curve->seed->data,
850 params->curve->seed->length);
851 ret->seed_len = params->curve->seed->length;
852 }
853
854 if (!params->order || !params->base || !params->base->data) {
855 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
856 goto err;
857 }
858
859 if ((point = EC_POINT_new(ret)) == NULL)
860 goto err;
861
862 /* set the point conversion form */
863 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
864 (params->base->data[0] & ~0x01));
865
866 /* extract the ec point */
867 if (!EC_POINT_oct2point(ret, point, params->base->data,
868 params->base->length, NULL)) {
869 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
870 goto err;
871 }
872
873 /* extract the order */
874 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
875 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
876 goto err;
877 }
878 if (BN_is_negative(a) || BN_is_zero(a)) {
879 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
880 goto err;
881 }
882 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
883 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
884 goto err;
885 }
886
887 /* extract the cofactor (optional) */
888 if (params->cofactor == NULL) {
889 BN_free(b);
890 b = NULL;
891 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
892 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
893 goto err;
894 }
895 /* set the generator, order and cofactor (if present) */
896 if (!EC_GROUP_set_generator(ret, point, a, b)) {
897 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
898 goto err;
899 }
900
901 ok = 1;
902
903 err:
904 if (!ok) {
905 EC_GROUP_clear_free(ret);
906 ret = NULL;
907 }
908
909 BN_free(p);
910 BN_free(a);
911 BN_free(b);
912 EC_POINT_free(point);
913 return (ret);
914 }
915
916 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
917 {
918 EC_GROUP *ret = NULL;
919 int tmp = 0;
920
921 if (params == NULL) {
922 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
923 return NULL;
924 }
925
926 if (params->type == 0) { /* the curve is given by an OID */
927 tmp = OBJ_obj2nid(params->value.named_curve);
928 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
929 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
930 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
931 return NULL;
932 }
933 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
934 } else if (params->type == 1) { /* the parameters are given by a
935 * ECPARAMETERS structure */
936 ret = ec_asn1_parameters2group(params->value.parameters);
937 if (!ret) {
938 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
939 return NULL;
940 }
941 EC_GROUP_set_asn1_flag(ret, 0x0);
942 } else if (params->type == 2) { /* implicitlyCA */
943 return NULL;
944 } else {
945 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
946 return NULL;
947 }
948
949 return ret;
950 }
951
952 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
953
954 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
955 {
956 EC_GROUP *group = NULL;
957 ECPKPARAMETERS *params = NULL;
958
959 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) {
960 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
961 ECPKPARAMETERS_free(params);
962 return NULL;
963 }
964
965 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
966 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
967 ECPKPARAMETERS_free(params);
968 return NULL;
969 }
970
971 if (a) {
972 EC_GROUP_clear_free(*a);
973 *a = group;
974 }
975
976 ECPKPARAMETERS_free(params);
977 return (group);
978 }
979
980 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
981 {
982 int ret = 0;
983 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
984 if (tmp == NULL) {
985 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
986 return 0;
987 }
988 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
989 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
990 ECPKPARAMETERS_free(tmp);
991 return 0;
992 }
993 ECPKPARAMETERS_free(tmp);
994 return (ret);
995 }
996
997 /* some EC_KEY functions */
998
999 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1000 {
1001 int ok = 0;
1002 EC_KEY *ret = NULL;
1003 EC_PRIVATEKEY *priv_key = NULL;
1004
1005 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, in, len)) == NULL) {
1006 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1007 return NULL;
1008 }
1009
1010 if (a == NULL || *a == NULL) {
1011 if ((ret = EC_KEY_new()) == NULL) {
1012 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1013 goto err;
1014 }
1015 } else
1016 ret = *a;
1017
1018 if (priv_key->parameters) {
1019 EC_GROUP_clear_free(ret->group);
1020 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1021 }
1022
1023 if (ret->group == NULL) {
1024 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1025 goto err;
1026 }
1027
1028 ret->version = priv_key->version;
1029
1030 if (priv_key->privateKey) {
1031 ret->priv_key = BN_bin2bn(ASN1_STRING_data(priv_key->privateKey),
1032 ASN1_STRING_length(priv_key->privateKey),
1033 ret->priv_key);
1034 if (ret->priv_key == NULL) {
1035 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
1036 goto err;
1037 }
1038 } else {
1039 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1040 goto err;
1041 }
1042
1043 EC_POINT_clear_free(ret->pub_key);
1044 ret->pub_key = EC_POINT_new(ret->group);
1045 if (ret->pub_key == NULL) {
1046 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1047 goto err;
1048 }
1049
1050 if (priv_key->publicKey) {
1051 const unsigned char *pub_oct;
1052 int pub_oct_len;
1053
1054 pub_oct = ASN1_STRING_data(priv_key->publicKey);
1055 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1056 /*
1057 * The first byte - point conversion form - must be present.
1058 */
1059 if (pub_oct_len <= 0) {
1060 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1061 goto err;
1062 }
1063 /* Save the point conversion form. */
1064 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1065 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1066 pub_oct, (size_t)(pub_oct_len), NULL)) {
1067 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1068 goto err;
1069 }
1070 } else {
1071 if (!EC_POINT_mul
1072 (ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL)) {
1073 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1074 goto err;
1075 }
1076 /* Remember the original private-key-only encoding. */
1077 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1078 }
1079
1080 if (a)
1081 *a = ret;
1082 ok = 1;
1083 err:
1084 if (!ok) {
1085 if (a == NULL || *a != ret)
1086 EC_KEY_free(ret);
1087 ret = NULL;
1088 }
1089
1090 if (priv_key)
1091 EC_PRIVATEKEY_free(priv_key);
1092
1093 return (ret);
1094 }
1095
1096 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1097 {
1098 int ret = 0, ok = 0;
1099 unsigned char *buffer = NULL;
1100 size_t buf_len = 0, tmp_len, bn_len;
1101 EC_PRIVATEKEY *priv_key = NULL;
1102
1103 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1104 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1105 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1106 goto err;
1107 }
1108
1109 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1110 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1111 goto err;
1112 }
1113
1114 priv_key->version = a->version;
1115
1116 bn_len = (size_t)BN_num_bytes(a->priv_key);
1117
1118 /* Octetstring may need leading zeros if BN is to short */
1119
1120 buf_len = (EC_GROUP_get_degree(a->group) + 7) / 8;
1121
1122 if (bn_len > buf_len) {
1123 ECerr(EC_F_I2D_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1124 goto err;
1125 }
1126
1127 buffer = OPENSSL_malloc(buf_len);
1128 if (buffer == NULL) {
1129 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1130 goto err;
1131 }
1132
1133 if (!BN_bn2bin(a->priv_key, buffer + buf_len - bn_len)) {
1134 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1135 goto err;
1136 }
1137
1138 if (buf_len - bn_len > 0) {
1139 memset(buffer, 0, buf_len - bn_len);
1140 }
1141
1142 if (!ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
1143 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1144 goto err;
1145 }
1146
1147 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1148 if ((priv_key->parameters =
1149 ec_asn1_group2pkparameters(a->group,
1150 priv_key->parameters)) == NULL) {
1151 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1152 goto err;
1153 }
1154 }
1155
1156 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1157 priv_key->publicKey = ASN1_BIT_STRING_new();
1158 if (priv_key->publicKey == NULL) {
1159 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1160 goto err;
1161 }
1162
1163 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1164 a->conv_form, NULL, 0, NULL);
1165
1166 if (tmp_len > buf_len) {
1167 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1168 if (!tmp_buffer) {
1169 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1170 goto err;
1171 }
1172 buffer = tmp_buffer;
1173 buf_len = tmp_len;
1174 }
1175
1176 if (!EC_POINT_point2oct(a->group, a->pub_key,
1177 a->conv_form, buffer, buf_len, NULL)) {
1178 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1179 goto err;
1180 }
1181
1182 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1183 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1184 if (!ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
1185 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1186 goto err;
1187 }
1188 }
1189
1190 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1191 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1192 goto err;
1193 }
1194 ok = 1;
1195 err:
1196 if (buffer)
1197 OPENSSL_free(buffer);
1198 if (priv_key)
1199 EC_PRIVATEKEY_free(priv_key);
1200 return (ok ? ret : 0);
1201 }
1202
1203 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1204 {
1205 if (a == NULL) {
1206 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1207 return 0;
1208 }
1209 return i2d_ECPKParameters(a->group, out);
1210 }
1211
1212 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1213 {
1214 EC_KEY *ret;
1215
1216 if (in == NULL || *in == NULL) {
1217 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1218 return NULL;
1219 }
1220
1221 if (a == NULL || *a == NULL) {
1222 if ((ret = EC_KEY_new()) == NULL) {
1223 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1224 return NULL;
1225 }
1226 } else
1227 ret = *a;
1228
1229 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1230 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1231 if (a == NULL || *a != ret)
1232 EC_KEY_free(ret);
1233 return NULL;
1234 }
1235
1236 if (a)
1237 *a = ret;
1238
1239 return ret;
1240 }
1241
1242 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1243 {
1244 EC_KEY *ret = NULL;
1245
1246 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1247 /*
1248 * sorry, but a EC_GROUP-structur is necessary to set the public key
1249 */
1250 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1251 return 0;
1252 }
1253 ret = *a;
1254 if (ret->pub_key == NULL &&
1255 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1256 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1257 return 0;
1258 }
1259 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1260 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1261 return 0;
1262 }
1263 /* save the point conversion form */
1264 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1265 *in += len;
1266 return ret;
1267 }
1268
1269 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1270 {
1271 size_t buf_len = 0;
1272 int new_buffer = 0;
1273
1274 if (a == NULL) {
1275 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1276 return 0;
1277 }
1278
1279 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1280 a->conv_form, NULL, 0, NULL);
1281
1282 if (out == NULL || buf_len == 0)
1283 /* out == NULL => just return the length of the octet string */
1284 return buf_len;
1285
1286 if (*out == NULL) {
1287 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1288 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1289 return 0;
1290 }
1291 new_buffer = 1;
1292 }
1293 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1294 *out, buf_len, NULL)) {
1295 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1296 if (new_buffer) {
1297 OPENSSL_free(*out);
1298 *out = NULL;
1299 }
1300 return 0;
1301 }
1302 if (!new_buffer)
1303 *out += buf_len;
1304 return buf_len;
1305 }
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