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 #define OSSL_NELEM(x) (sizeof(x)/sizeof(x[0]))
66
EC_GROUP_get_basis_type(const EC_GROUP * group)67 int EC_GROUP_get_basis_type(const EC_GROUP *group)
68 {
69 int i;
70
71 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
72 NID_X9_62_characteristic_two_field)
73 /* everything else is currently not supported */
74 return 0;
75
76 /* Find the last non-zero element of group->poly[] */
77 for (i = 0;
78 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
79 i++)
80 continue;
81
82 if (i == 4)
83 return NID_X9_62_ppBasis;
84 else if (i == 2)
85 return NID_X9_62_tpBasis;
86 else
87 /* everything else is currently not supported */
88 return 0;
89 }
90
91 #ifndef OPENSSL_NO_EC2M
EC_GROUP_get_trinomial_basis(const EC_GROUP * group,unsigned int * k)92 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
93 {
94 if (group == NULL)
95 return 0;
96
97 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
98 NID_X9_62_characteristic_two_field
99 || !((group->poly[0] != 0) && (group->poly[1] != 0)
100 && (group->poly[2] == 0))) {
101 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
102 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
103 return 0;
104 }
105
106 if (k)
107 *k = group->poly[1];
108
109 return 1;
110 }
111
EC_GROUP_get_pentanomial_basis(const EC_GROUP * group,unsigned int * k1,unsigned int * k2,unsigned int * k3)112 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
113 unsigned int *k2, unsigned int *k3)
114 {
115 if (group == NULL)
116 return 0;
117
118 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
119 NID_X9_62_characteristic_two_field
120 || !((group->poly[0] != 0) && (group->poly[1] != 0)
121 && (group->poly[2] != 0) && (group->poly[3] != 0)
122 && (group->poly[4] == 0))) {
123 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
124 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
125 return 0;
126 }
127
128 if (k1)
129 *k1 = group->poly[3];
130 if (k2)
131 *k2 = group->poly[2];
132 if (k3)
133 *k3 = group->poly[1];
134
135 return 1;
136 }
137 #endif
138
139 /* some structures needed for the asn1 encoding */
140 typedef struct x9_62_pentanomial_st {
141 long k1;
142 long k2;
143 long k3;
144 } X9_62_PENTANOMIAL;
145
146 typedef struct x9_62_characteristic_two_st {
147 long m;
148 ASN1_OBJECT *type;
149 union {
150 char *ptr;
151 /* NID_X9_62_onBasis */
152 ASN1_NULL *onBasis;
153 /* NID_X9_62_tpBasis */
154 ASN1_INTEGER *tpBasis;
155 /* NID_X9_62_ppBasis */
156 X9_62_PENTANOMIAL *ppBasis;
157 /* anything else */
158 ASN1_TYPE *other;
159 } p;
160 } X9_62_CHARACTERISTIC_TWO;
161
162 typedef struct x9_62_fieldid_st {
163 ASN1_OBJECT *fieldType;
164 union {
165 char *ptr;
166 /* NID_X9_62_prime_field */
167 ASN1_INTEGER *prime;
168 /* NID_X9_62_characteristic_two_field */
169 X9_62_CHARACTERISTIC_TWO *char_two;
170 /* anything else */
171 ASN1_TYPE *other;
172 } p;
173 } X9_62_FIELDID;
174
175 typedef struct x9_62_curve_st {
176 ASN1_OCTET_STRING *a;
177 ASN1_OCTET_STRING *b;
178 ASN1_BIT_STRING *seed;
179 } X9_62_CURVE;
180
181 typedef struct ec_parameters_st {
182 long version;
183 X9_62_FIELDID *fieldID;
184 X9_62_CURVE *curve;
185 ASN1_OCTET_STRING *base;
186 ASN1_INTEGER *order;
187 ASN1_INTEGER *cofactor;
188 } ECPARAMETERS;
189
190 struct ecpk_parameters_st {
191 int type;
192 union {
193 ASN1_OBJECT *named_curve;
194 ECPARAMETERS *parameters;
195 ASN1_NULL *implicitlyCA;
196 } value;
197 } /* ECPKPARAMETERS */ ;
198
199 /* SEC1 ECPrivateKey */
200 typedef struct ec_privatekey_st {
201 long version;
202 ASN1_OCTET_STRING *privateKey;
203 ECPKPARAMETERS *parameters;
204 ASN1_BIT_STRING *publicKey;
205 } EC_PRIVATEKEY;
206
207 /* the OpenSSL ASN.1 definitions */
208 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
209 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
210 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
211 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
212 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
213
214 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
215 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
216
217 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
218
219 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
220 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
221 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
222 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
223 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
224
225 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
226 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
227 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
228 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
229 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
230
231 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
232 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
233
234 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
235
236 ASN1_ADB(X9_62_FIELDID) = {
237 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
238 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
239 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
240
241 ASN1_SEQUENCE(X9_62_FIELDID) = {
242 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
243 ASN1_ADB_OBJECT(X9_62_FIELDID)
244 } ASN1_SEQUENCE_END(X9_62_FIELDID)
245
246 ASN1_SEQUENCE(X9_62_CURVE) = {
247 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
248 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
249 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
250 } ASN1_SEQUENCE_END(X9_62_CURVE)
251
252 ASN1_SEQUENCE(ECPARAMETERS) = {
253 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
254 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
255 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
256 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
257 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
258 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
259 } ASN1_SEQUENCE_END(ECPARAMETERS)
260
261 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
262 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
263
264 ASN1_CHOICE(ECPKPARAMETERS) = {
265 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
266 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
267 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
268 } ASN1_CHOICE_END(ECPKPARAMETERS)
269
270 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
271 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
272 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
273
274 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
275 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
276 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
277 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
278 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
279 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
280
281 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
282 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
283 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
284
285 /* some declarations of internal function */
286
287 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
288 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
289 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
290 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
291 /*
292 * ec_asn1_parameters2group() creates a EC_GROUP object from a ECPARAMETERS
293 * object
294 */
295 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
296 /*
297 * ec_asn1_group2parameters() creates a ECPARAMETERS object from a EC_GROUP
298 * object
299 */
300 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,
301 ECPARAMETERS *);
302 /*
303 * ec_asn1_pkparameters2group() creates a EC_GROUP object from a
304 * ECPKPARAMETERS object
305 */
306 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
307 /*
308 * ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
309 * EC_GROUP object
310 */
311 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
312 ECPKPARAMETERS *);
313
314 /* the function definitions */
315
ec_asn1_group2fieldid(const EC_GROUP * group,X9_62_FIELDID * field)316 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
317 {
318 int ok = 0, nid;
319 BIGNUM *tmp = NULL;
320
321 if (group == NULL || field == NULL)
322 return 0;
323
324 /* clear the old values (if necessary) */
325 if (field->fieldType != NULL)
326 ASN1_OBJECT_free(field->fieldType);
327 if (field->p.other != NULL)
328 ASN1_TYPE_free(field->p.other);
329
330 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
331 /* set OID for the field */
332 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
333 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
334 goto err;
335 }
336
337 if (nid == NID_X9_62_prime_field) {
338 if ((tmp = BN_new()) == NULL) {
339 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
340 goto err;
341 }
342 /* the parameters are specified by the prime number p */
343 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL)) {
344 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
345 goto err;
346 }
347 /* set the prime number */
348 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
349 if (field->p.prime == NULL) {
350 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
351 goto err;
352 }
353 } else /* nid == NID_X9_62_characteristic_two_field */
354 #ifdef OPENSSL_NO_EC2M
355 {
356 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
357 goto err;
358 }
359 #else
360 {
361 int field_type;
362 X9_62_CHARACTERISTIC_TWO *char_two;
363
364 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
365 char_two = field->p.char_two;
366
367 if (char_two == NULL) {
368 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
369 goto err;
370 }
371
372 char_two->m = (long)EC_GROUP_get_degree(group);
373
374 field_type = EC_GROUP_get_basis_type(group);
375
376 if (field_type == 0) {
377 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
378 goto err;
379 }
380 /* set base type OID */
381 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
382 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
383 goto err;
384 }
385
386 if (field_type == NID_X9_62_tpBasis) {
387 unsigned int k;
388
389 if (!EC_GROUP_get_trinomial_basis(group, &k))
390 goto err;
391
392 char_two->p.tpBasis = ASN1_INTEGER_new();
393 if (!char_two->p.tpBasis) {
394 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
395 goto err;
396 }
397 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
398 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
399 goto err;
400 }
401 } else if (field_type == NID_X9_62_ppBasis) {
402 unsigned int k1, k2, k3;
403
404 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
405 goto err;
406
407 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
408 if (!char_two->p.ppBasis) {
409 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
410 goto err;
411 }
412
413 /* set k? values */
414 char_two->p.ppBasis->k1 = (long)k1;
415 char_two->p.ppBasis->k2 = (long)k2;
416 char_two->p.ppBasis->k3 = (long)k3;
417 } else { /* field_type == NID_X9_62_onBasis */
418
419 /* for ONB the parameters are (asn1) NULL */
420 char_two->p.onBasis = ASN1_NULL_new();
421 if (!char_two->p.onBasis) {
422 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
423 goto err;
424 }
425 }
426 }
427 #endif
428
429 ok = 1;
430
431 err:if (tmp)
432 BN_free(tmp);
433 return (ok);
434 }
435
ec_asn1_group2curve(const EC_GROUP * group,X9_62_CURVE * curve)436 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
437 {
438 int ok = 0, nid;
439 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
440 unsigned char *buffer_1 = NULL, *buffer_2 = NULL,
441 *a_buf = NULL, *b_buf = NULL;
442 size_t len_1, len_2;
443 unsigned char char_zero = 0;
444
445 if (!group || !curve || !curve->a || !curve->b)
446 return 0;
447
448 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
449 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
450 goto err;
451 }
452
453 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
454
455 /* get a and b */
456 if (nid == NID_X9_62_prime_field) {
457 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL)) {
458 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
459 goto err;
460 }
461 }
462 #ifndef OPENSSL_NO_EC2M
463 else { /* nid == NID_X9_62_characteristic_two_field */
464
465 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL)) {
466 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
467 goto err;
468 }
469 }
470 #endif
471 len_1 = (size_t)BN_num_bytes(tmp_1);
472 len_2 = (size_t)BN_num_bytes(tmp_2);
473
474 if (len_1 == 0) {
475 /* len_1 == 0 => a == 0 */
476 a_buf = &char_zero;
477 len_1 = 1;
478 } else {
479 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL) {
480 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
481 goto err;
482 }
483 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
484 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
485 goto err;
486 }
487 a_buf = buffer_1;
488 }
489
490 if (len_2 == 0) {
491 /* len_2 == 0 => b == 0 */
492 b_buf = &char_zero;
493 len_2 = 1;
494 } else {
495 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL) {
496 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
497 goto err;
498 }
499 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
500 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
501 goto err;
502 }
503 b_buf = buffer_2;
504 }
505
506 /* set a and b */
507 if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
508 !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2)) {
509 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
510 goto err;
511 }
512
513 /* set the seed (optional) */
514 if (group->seed) {
515 if (!curve->seed)
516 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
517 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
518 goto err;
519 }
520 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
521 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
522 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
523 (int)group->seed_len)) {
524 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
525 goto err;
526 }
527 } else {
528 if (curve->seed) {
529 ASN1_BIT_STRING_free(curve->seed);
530 curve->seed = NULL;
531 }
532 }
533
534 ok = 1;
535
536 err:if (buffer_1)
537 OPENSSL_free(buffer_1);
538 if (buffer_2)
539 OPENSSL_free(buffer_2);
540 if (tmp_1)
541 BN_free(tmp_1);
542 if (tmp_2)
543 BN_free(tmp_2);
544 return (ok);
545 }
546
ec_asn1_group2parameters(const EC_GROUP * group,ECPARAMETERS * param)547 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
548 ECPARAMETERS *param)
549 {
550 int ok = 0;
551 size_t len = 0;
552 ECPARAMETERS *ret = NULL;
553 BIGNUM *tmp = NULL;
554 unsigned char *buffer = NULL;
555 const EC_POINT *point = NULL;
556 point_conversion_form_t form;
557
558 if ((tmp = BN_new()) == NULL) {
559 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
560 goto err;
561 }
562
563 if (param == NULL) {
564 if ((ret = ECPARAMETERS_new()) == NULL) {
565 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
566 goto err;
567 }
568 } else
569 ret = param;
570
571 /* set the version (always one) */
572 ret->version = (long)0x1;
573
574 /* set the fieldID */
575 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
576 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
577 goto err;
578 }
579
580 /* set the curve */
581 if (!ec_asn1_group2curve(group, ret->curve)) {
582 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
583 goto err;
584 }
585
586 /* set the base point */
587 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
588 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
589 goto err;
590 }
591
592 form = EC_GROUP_get_point_conversion_form(group);
593
594 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
595 if (len == 0) {
596 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
597 goto err;
598 }
599 if ((buffer = OPENSSL_malloc(len)) == NULL) {
600 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
601 goto err;
602 }
603 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
604 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
605 goto err;
606 }
607 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
608 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
609 goto err;
610 }
611 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
612 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
613 goto err;
614 }
615
616 /* set the order */
617 if (!EC_GROUP_get_order(group, tmp, NULL)) {
618 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
619 goto err;
620 }
621 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
622 if (ret->order == NULL) {
623 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
624 goto err;
625 }
626
627 /* set the cofactor (optional) */
628 if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
629 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
630 if (ret->cofactor == NULL) {
631 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
632 goto err;
633 }
634 }
635
636 ok = 1;
637
638 err:if (!ok) {
639 if (ret && !param)
640 ECPARAMETERS_free(ret);
641 ret = NULL;
642 }
643 if (tmp)
644 BN_free(tmp);
645 if (buffer)
646 OPENSSL_free(buffer);
647 return (ret);
648 }
649
ec_asn1_group2pkparameters(const EC_GROUP * group,ECPKPARAMETERS * params)650 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
651 ECPKPARAMETERS *params)
652 {
653 int ok = 1, tmp;
654 ECPKPARAMETERS *ret = params;
655
656 if (ret == NULL) {
657 if ((ret = ECPKPARAMETERS_new()) == NULL) {
658 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS, ERR_R_MALLOC_FAILURE);
659 return NULL;
660 }
661 } else {
662 if (ret->type == 0 && ret->value.named_curve)
663 ASN1_OBJECT_free(ret->value.named_curve);
664 else if (ret->type == 1 && ret->value.parameters)
665 ECPARAMETERS_free(ret->value.parameters);
666 }
667
668 if (EC_GROUP_get_asn1_flag(group)) {
669 /*
670 * use the asn1 OID to describe the the elliptic curve parameters
671 */
672 tmp = EC_GROUP_get_curve_name(group);
673 if (tmp) {
674 ret->type = 0;
675 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
676 ok = 0;
677 } else
678 /* we don't kmow the nid => ERROR */
679 ok = 0;
680 } else {
681 /* use the ECPARAMETERS structure */
682 ret->type = 1;
683 if ((ret->value.parameters =
684 ec_asn1_group2parameters(group, NULL)) == NULL)
685 ok = 0;
686 }
687
688 if (!ok) {
689 ECPKPARAMETERS_free(ret);
690 return NULL;
691 }
692 return ret;
693 }
694
ec_asn1_parameters2group(const ECPARAMETERS * params)695 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
696 {
697 int ok = 0, tmp;
698 EC_GROUP *ret = NULL;
699 BIGNUM *p = NULL, *a = NULL, *b = NULL;
700 EC_POINT *point = NULL;
701 long field_bits;
702
703 if (!params->fieldID || !params->fieldID->fieldType ||
704 !params->fieldID->p.ptr) {
705 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
706 goto err;
707 }
708
709 /* now extract the curve parameters a and b */
710 if (!params->curve || !params->curve->a ||
711 !params->curve->a->data || !params->curve->b ||
712 !params->curve->b->data) {
713 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
714 goto err;
715 }
716 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
717 if (a == NULL) {
718 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
719 goto err;
720 }
721 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
722 if (b == NULL) {
723 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
724 goto err;
725 }
726
727 /* get the field parameters */
728 tmp = OBJ_obj2nid(params->fieldID->fieldType);
729 if (tmp == NID_X9_62_characteristic_two_field)
730 #ifdef OPENSSL_NO_EC2M
731 {
732 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
733 goto err;
734 }
735 #else
736 {
737 X9_62_CHARACTERISTIC_TWO *char_two;
738
739 char_two = params->fieldID->p.char_two;
740
741 field_bits = char_two->m;
742 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
743 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
744 goto err;
745 }
746
747 if ((p = BN_new()) == NULL) {
748 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
749 goto err;
750 }
751
752 /* get the base type */
753 tmp = OBJ_obj2nid(char_two->type);
754
755 if (tmp == NID_X9_62_tpBasis) {
756 long tmp_long;
757
758 if (!char_two->p.tpBasis) {
759 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
760 goto err;
761 }
762
763 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
764
765 if (!(char_two->m > tmp_long && tmp_long > 0)) {
766 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
767 EC_R_INVALID_TRINOMIAL_BASIS);
768 goto err;
769 }
770
771 /* create the polynomial */
772 if (!BN_set_bit(p, (int)char_two->m))
773 goto err;
774 if (!BN_set_bit(p, (int)tmp_long))
775 goto err;
776 if (!BN_set_bit(p, 0))
777 goto err;
778 } else if (tmp == NID_X9_62_ppBasis) {
779 X9_62_PENTANOMIAL *penta;
780
781 penta = char_two->p.ppBasis;
782 if (!penta) {
783 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
784 goto err;
785 }
786
787 if (!
788 (char_two->m > penta->k3 && penta->k3 > penta->k2
789 && penta->k2 > penta->k1 && penta->k1 > 0)) {
790 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
791 EC_R_INVALID_PENTANOMIAL_BASIS);
792 goto err;
793 }
794
795 /* create the polynomial */
796 if (!BN_set_bit(p, (int)char_two->m))
797 goto err;
798 if (!BN_set_bit(p, (int)penta->k1))
799 goto err;
800 if (!BN_set_bit(p, (int)penta->k2))
801 goto err;
802 if (!BN_set_bit(p, (int)penta->k3))
803 goto err;
804 if (!BN_set_bit(p, 0))
805 goto err;
806 } else if (tmp == NID_X9_62_onBasis) {
807 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
808 goto err;
809 } else { /* error */
810
811 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
812 goto err;
813 }
814
815 /* create the EC_GROUP structure */
816 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
817 }
818 #endif
819 else if (tmp == NID_X9_62_prime_field) {
820 /* we have a curve over a prime field */
821 /* extract the prime number */
822 if (!params->fieldID->p.prime) {
823 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
824 goto err;
825 }
826 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
827 if (p == NULL) {
828 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
829 goto err;
830 }
831
832 if (BN_is_negative(p) || BN_is_zero(p)) {
833 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
834 goto err;
835 }
836
837 field_bits = BN_num_bits(p);
838 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
839 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
840 goto err;
841 }
842
843 /* create the EC_GROUP structure */
844 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
845 } else {
846 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
847 goto err;
848 }
849
850 if (ret == NULL) {
851 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
852 goto err;
853 }
854
855 /* extract seed (optional) */
856 if (params->curve->seed != NULL) {
857 if (ret->seed != NULL)
858 OPENSSL_free(ret->seed);
859 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length))) {
860 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
861 goto err;
862 }
863 memcpy(ret->seed, params->curve->seed->data,
864 params->curve->seed->length);
865 ret->seed_len = params->curve->seed->length;
866 }
867
868 if (!params->order || !params->base || !params->base->data) {
869 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
870 goto err;
871 }
872
873 if ((point = EC_POINT_new(ret)) == NULL)
874 goto err;
875
876 /* set the point conversion form */
877 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
878 (params->base->data[0] & ~0x01));
879
880 /* extract the ec point */
881 if (!EC_POINT_oct2point(ret, point, params->base->data,
882 params->base->length, NULL)) {
883 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
884 goto err;
885 }
886
887 /* extract the order */
888 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
889 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
890 goto err;
891 }
892 if (BN_is_negative(a) || BN_is_zero(a)) {
893 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
894 goto err;
895 }
896 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
897 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
898 goto err;
899 }
900
901 /* extract the cofactor (optional) */
902 if (params->cofactor == NULL) {
903 if (b) {
904 BN_free(b);
905 b = NULL;
906 }
907 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
908 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
909 goto err;
910 }
911 /* set the generator, order and cofactor (if present) */
912 if (!EC_GROUP_set_generator(ret, point, a, b)) {
913 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
914 goto err;
915 }
916
917 ok = 1;
918
919 err:if (!ok) {
920 if (ret)
921 EC_GROUP_clear_free(ret);
922 ret = NULL;
923 }
924
925 if (p)
926 BN_free(p);
927 if (a)
928 BN_free(a);
929 if (b)
930 BN_free(b);
931 if (point)
932 EC_POINT_free(point);
933 return (ret);
934 }
935
ec_asn1_pkparameters2group(const ECPKPARAMETERS * params)936 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
937 {
938 EC_GROUP *ret = NULL;
939 int tmp = 0;
940
941 if (params == NULL) {
942 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_MISSING_PARAMETERS);
943 return NULL;
944 }
945
946 if (params->type == 0) { /* the curve is given by an OID */
947 tmp = OBJ_obj2nid(params->value.named_curve);
948 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
949 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
950 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
951 return NULL;
952 }
953 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
954 } else if (params->type == 1) { /* the parameters are given by a
955 * ECPARAMETERS structure */
956 ret = ec_asn1_parameters2group(params->value.parameters);
957 if (!ret) {
958 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
959 return NULL;
960 }
961 EC_GROUP_set_asn1_flag(ret, 0x0);
962 } else if (params->type == 2) { /* implicitlyCA */
963 return NULL;
964 } else {
965 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
966 return NULL;
967 }
968
969 return ret;
970 }
971
972 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
973
d2i_ECPKParameters(EC_GROUP ** a,const unsigned char ** in,long len)974 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
975 {
976 EC_GROUP *group = NULL;
977 ECPKPARAMETERS *params = NULL;
978 const unsigned char *p = *in;
979
980 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
981 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
982 ECPKPARAMETERS_free(params);
983 return NULL;
984 }
985
986 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
987 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
988 ECPKPARAMETERS_free(params);
989 return NULL;
990 }
991
992 if (a && *a)
993 EC_GROUP_clear_free(*a);
994 if (a)
995 *a = group;
996
997 ECPKPARAMETERS_free(params);
998 *in = p;
999 return (group);
1000 }
1001
i2d_ECPKParameters(const EC_GROUP * a,unsigned char ** out)1002 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
1003 {
1004 int ret = 0;
1005 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
1006 if (tmp == NULL) {
1007 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
1008 return 0;
1009 }
1010 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
1011 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
1012 ECPKPARAMETERS_free(tmp);
1013 return 0;
1014 }
1015 ECPKPARAMETERS_free(tmp);
1016 return (ret);
1017 }
1018
1019 /* some EC_KEY functions */
1020
d2i_ECPrivateKey(EC_KEY ** a,const unsigned char ** in,long len)1021 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1022 {
1023 int ok = 0;
1024 EC_KEY *ret = NULL;
1025 EC_PRIVATEKEY *priv_key = NULL;
1026 const unsigned char *p = *in;
1027
1028 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
1029 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1030 return NULL;
1031 }
1032
1033 if (a == NULL || *a == NULL) {
1034 if ((ret = EC_KEY_new()) == NULL) {
1035 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1036 goto err;
1037 }
1038 } else
1039 ret = *a;
1040
1041 if (priv_key->parameters) {
1042 if (ret->group)
1043 EC_GROUP_clear_free(ret->group);
1044 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1045 }
1046
1047 if (ret->group == NULL) {
1048 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1049 goto err;
1050 }
1051
1052 ret->version = priv_key->version;
1053
1054 if (priv_key->privateKey) {
1055 ret->priv_key = BN_bin2bn(M_ASN1_STRING_data(priv_key->privateKey),
1056 M_ASN1_STRING_length(priv_key->privateKey),
1057 ret->priv_key);
1058 if (ret->priv_key == NULL) {
1059 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_BN_LIB);
1060 goto err;
1061 }
1062 } else {
1063 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1064 goto err;
1065 }
1066
1067 if (ret->pub_key)
1068 EC_POINT_clear_free(ret->pub_key);
1069 ret->pub_key = EC_POINT_new(ret->group);
1070 if (ret->pub_key == NULL) {
1071 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1072 goto err;
1073 }
1074
1075 if (priv_key->publicKey) {
1076 const unsigned char *pub_oct;
1077 int pub_oct_len;
1078
1079 pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
1080 pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
1081 /*
1082 * The first byte - point conversion form - must be present.
1083 */
1084 if (pub_oct_len <= 0) {
1085 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1086 goto err;
1087 }
1088 /* Save the point conversion form. */
1089 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1090 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1091 pub_oct, (size_t)(pub_oct_len), NULL)) {
1092 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1093 goto err;
1094 }
1095 } else {
1096 if (!EC_POINT_mul
1097 (ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL)) {
1098 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1099 goto err;
1100 }
1101 /* Remember the original private-key-only encoding. */
1102 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1103 }
1104
1105 if (a)
1106 *a = ret;
1107 *in = p;
1108 ok = 1;
1109 err:
1110 if (!ok) {
1111 if (ret && (a == NULL || *a != ret))
1112 EC_KEY_free(ret);
1113 ret = NULL;
1114 }
1115
1116 if (priv_key)
1117 EC_PRIVATEKEY_free(priv_key);
1118
1119 return (ret);
1120 }
1121
i2d_ECPrivateKey(EC_KEY * a,unsigned char ** out)1122 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1123 {
1124 int ret = 0, ok = 0;
1125 unsigned char *buffer = NULL;
1126 size_t buf_len = 0, tmp_len, bn_len;
1127 EC_PRIVATEKEY *priv_key = NULL;
1128
1129 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1130 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1131 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1132 goto err;
1133 }
1134
1135 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1136 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1137 goto err;
1138 }
1139
1140 priv_key->version = a->version;
1141
1142 bn_len = (size_t)BN_num_bytes(a->priv_key);
1143
1144 /* Octetstring may need leading zeros if BN is to short */
1145
1146 buf_len = (EC_GROUP_get_degree(a->group) + 7) / 8;
1147
1148 if (bn_len > buf_len) {
1149 ECerr(EC_F_I2D_ECPRIVATEKEY, EC_R_BUFFER_TOO_SMALL);
1150 goto err;
1151 }
1152
1153 buffer = OPENSSL_malloc(buf_len);
1154 if (buffer == NULL) {
1155 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1156 goto err;
1157 }
1158
1159 if (!BN_bn2bin(a->priv_key, buffer + buf_len - bn_len)) {
1160 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1161 goto err;
1162 }
1163
1164 if (buf_len - bn_len > 0) {
1165 memset(buffer, 0, buf_len - bn_len);
1166 }
1167
1168 if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
1169 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1170 goto err;
1171 }
1172
1173 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1174 if ((priv_key->parameters =
1175 ec_asn1_group2pkparameters(a->group,
1176 priv_key->parameters)) == NULL) {
1177 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1178 goto err;
1179 }
1180 }
1181
1182 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1183 priv_key->publicKey = M_ASN1_BIT_STRING_new();
1184 if (priv_key->publicKey == NULL) {
1185 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1186 goto err;
1187 }
1188
1189 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1190 a->conv_form, NULL, 0, NULL);
1191
1192 if (tmp_len > buf_len) {
1193 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1194 if (!tmp_buffer) {
1195 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1196 goto err;
1197 }
1198 buffer = tmp_buffer;
1199 buf_len = tmp_len;
1200 }
1201
1202 if (!EC_POINT_point2oct(a->group, a->pub_key,
1203 a->conv_form, buffer, buf_len, NULL)) {
1204 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1205 goto err;
1206 }
1207
1208 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1209 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1210 if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
1211 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1212 goto err;
1213 }
1214 }
1215
1216 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1217 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1218 goto err;
1219 }
1220 ok = 1;
1221 err:
1222 if (buffer)
1223 OPENSSL_free(buffer);
1224 if (priv_key)
1225 EC_PRIVATEKEY_free(priv_key);
1226 return (ok ? ret : 0);
1227 }
1228
i2d_ECParameters(EC_KEY * a,unsigned char ** out)1229 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1230 {
1231 if (a == NULL) {
1232 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1233 return 0;
1234 }
1235 return i2d_ECPKParameters(a->group, out);
1236 }
1237
d2i_ECParameters(EC_KEY ** a,const unsigned char ** in,long len)1238 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1239 {
1240 EC_KEY *ret;
1241
1242 if (in == NULL || *in == NULL) {
1243 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1244 return NULL;
1245 }
1246
1247 if (a == NULL || *a == NULL) {
1248 if ((ret = EC_KEY_new()) == NULL) {
1249 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1250 return NULL;
1251 }
1252 } else
1253 ret = *a;
1254
1255 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1256 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1257 if (a == NULL || *a != ret)
1258 EC_KEY_free(ret);
1259 return NULL;
1260 }
1261
1262 if (a)
1263 *a = ret;
1264
1265 return ret;
1266 }
1267
o2i_ECPublicKey(EC_KEY ** a,const unsigned char ** in,long len)1268 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1269 {
1270 EC_KEY *ret = NULL;
1271
1272 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1273 /*
1274 * sorry, but a EC_GROUP-structur is necessary to set the public key
1275 */
1276 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1277 return 0;
1278 }
1279 ret = *a;
1280 if (ret->pub_key == NULL &&
1281 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1282 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1283 return 0;
1284 }
1285 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1286 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1287 return 0;
1288 }
1289 /* save the point conversion form */
1290 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1291 *in += len;
1292 return ret;
1293 }
1294
i2o_ECPublicKey(EC_KEY * a,unsigned char ** out)1295 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1296 {
1297 size_t buf_len = 0;
1298 int new_buffer = 0;
1299
1300 if (a == NULL) {
1301 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1302 return 0;
1303 }
1304
1305 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1306 a->conv_form, NULL, 0, NULL);
1307
1308 if (out == NULL || buf_len == 0)
1309 /* out == NULL => just return the length of the octet string */
1310 return buf_len;
1311
1312 if (*out == NULL) {
1313 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1314 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1315 return 0;
1316 }
1317 new_buffer = 1;
1318 }
1319 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1320 *out, buf_len, NULL)) {
1321 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1322 if (new_buffer) {
1323 OPENSSL_free(*out);
1324 *out = NULL;
1325 }
1326 return 0;
1327 }
1328 if (!new_buffer)
1329 *out += buf_len;
1330 return buf_len;
1331 }
1332