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RT3065: automatically generate a missing EC public key
[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
66 int EC_GROUP_get_basis_type(const EC_GROUP *group)
67 {
68 int i=0;
69
70 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
71 NID_X9_62_characteristic_two_field)
72 /* everything else is currently not supported */
73 return 0;
74
75 while (group->poly[i] != 0)
76 i++;
77
78 if (i == 4)
79 return NID_X9_62_ppBasis;
80 else if (i == 2)
81 return NID_X9_62_tpBasis;
82 else
83 /* everything else is currently not supported */
84 return 0;
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) && (group->poly[2] == 0)))
95 {
96 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, 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 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
106 unsigned int *k2, unsigned int *k3)
107 {
108 if (group == NULL)
109 return 0;
110
111 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
112 NID_X9_62_characteristic_two_field
113 || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0)))
114 {
115 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
116 return 0;
117 }
118
119 if (k1)
120 *k1 = group->poly[3];
121 if (k2)
122 *k2 = group->poly[2];
123 if (k3)
124 *k3 = group->poly[1];
125
126 return 1;
127 }
128 #endif
129
130
131 /* some structures needed for the asn1 encoding */
132 typedef struct x9_62_pentanomial_st {
133 long k1;
134 long k2;
135 long k3;
136 } X9_62_PENTANOMIAL;
137
138 typedef struct x9_62_characteristic_two_st {
139 long m;
140 ASN1_OBJECT *type;
141 union {
142 char *ptr;
143 /* NID_X9_62_onBasis */
144 ASN1_NULL *onBasis;
145 /* NID_X9_62_tpBasis */
146 ASN1_INTEGER *tpBasis;
147 /* NID_X9_62_ppBasis */
148 X9_62_PENTANOMIAL *ppBasis;
149 /* anything else */
150 ASN1_TYPE *other;
151 } p;
152 } X9_62_CHARACTERISTIC_TWO;
153
154 typedef struct x9_62_fieldid_st {
155 ASN1_OBJECT *fieldType;
156 union {
157 char *ptr;
158 /* NID_X9_62_prime_field */
159 ASN1_INTEGER *prime;
160 /* NID_X9_62_characteristic_two_field */
161 X9_62_CHARACTERISTIC_TWO *char_two;
162 /* anything else */
163 ASN1_TYPE *other;
164 } p;
165 } X9_62_FIELDID;
166
167 typedef struct x9_62_curve_st {
168 ASN1_OCTET_STRING *a;
169 ASN1_OCTET_STRING *b;
170 ASN1_BIT_STRING *seed;
171 } X9_62_CURVE;
172
173 typedef struct ec_parameters_st {
174 long version;
175 X9_62_FIELDID *fieldID;
176 X9_62_CURVE *curve;
177 ASN1_OCTET_STRING *base;
178 ASN1_INTEGER *order;
179 ASN1_INTEGER *cofactor;
180 } ECPARAMETERS;
181
182 struct ecpk_parameters_st {
183 int type;
184 union {
185 ASN1_OBJECT *named_curve;
186 ECPARAMETERS *parameters;
187 ASN1_NULL *implicitlyCA;
188 } value;
189 }/* ECPKPARAMETERS */;
190
191 /* SEC1 ECPrivateKey */
192 typedef struct ec_privatekey_st {
193 long version;
194 ASN1_OCTET_STRING *privateKey;
195 ECPKPARAMETERS *parameters;
196 ASN1_BIT_STRING *publicKey;
197 } EC_PRIVATEKEY;
198
199 /* the OpenSSL ASN.1 definitions */
200 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
201 ASN1_SIMPLE(X9_62_PENTANOMIAL, k1, LONG),
202 ASN1_SIMPLE(X9_62_PENTANOMIAL, k2, LONG),
203 ASN1_SIMPLE(X9_62_PENTANOMIAL, k3, LONG)
204 } ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
205
206 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
207 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
208
209 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
210
211 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
212 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
213 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
214 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
215 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
216
217 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
218 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, m, LONG),
219 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
220 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
221 } ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
222
223 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
224 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
225
226 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
227
228 ASN1_ADB(X9_62_FIELDID) = {
229 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
230 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
231 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
232
233 ASN1_SEQUENCE(X9_62_FIELDID) = {
234 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
235 ASN1_ADB_OBJECT(X9_62_FIELDID)
236 } ASN1_SEQUENCE_END(X9_62_FIELDID)
237
238 ASN1_SEQUENCE(X9_62_CURVE) = {
239 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
240 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
241 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
242 } ASN1_SEQUENCE_END(X9_62_CURVE)
243
244 ASN1_SEQUENCE(ECPARAMETERS) = {
245 ASN1_SIMPLE(ECPARAMETERS, version, LONG),
246 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
247 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
248 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
249 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
250 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
251 } ASN1_SEQUENCE_END(ECPARAMETERS)
252
253 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
254 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
255
256 ASN1_CHOICE(ECPKPARAMETERS) = {
257 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
258 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
259 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
260 } ASN1_CHOICE_END(ECPKPARAMETERS)
261
262 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
263 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
264 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
265
266 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
267 ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
268 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
269 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
270 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
271 } ASN1_SEQUENCE_END(EC_PRIVATEKEY)
272
273 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
274 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
275 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
276
277 /* some declarations of internal function */
278
279 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
280 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
281 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
282 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
283 /* ec_asn1_parameters2group() creates a EC_GROUP object from a
284 * ECPARAMETERS object */
285 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
286 /* ec_asn1_group2parameters() creates a ECPARAMETERS object from a
287 * EC_GROUP object */
288 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *,ECPARAMETERS *);
289 /* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
290 * ECPKPARAMETERS object */
291 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
292 /* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
293 * EC_GROUP object */
294 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
295 ECPKPARAMETERS *);
296
297
298 /* the function definitions */
299
300 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
301 {
302 int ok=0, nid;
303 BIGNUM *tmp = NULL;
304
305 if (group == NULL || field == NULL)
306 return 0;
307
308 /* clear the old values (if necessary) */
309 if (field->fieldType != NULL)
310 ASN1_OBJECT_free(field->fieldType);
311 if (field->p.other != NULL)
312 ASN1_TYPE_free(field->p.other);
313
314 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
315 /* set OID for the field */
316 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL)
317 {
318 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
319 goto err;
320 }
321
322 if (nid == NID_X9_62_prime_field)
323 {
324 if ((tmp = BN_new()) == NULL)
325 {
326 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
327 goto err;
328 }
329 /* the parameters are specified by the prime number p */
330 if (!EC_GROUP_get_curve_GFp(group, tmp, NULL, NULL, NULL))
331 {
332 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
333 goto err;
334 }
335 /* set the prime number */
336 field->p.prime = BN_to_ASN1_INTEGER(tmp,NULL);
337 if (field->p.prime == NULL)
338 {
339 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
340 goto err;
341 }
342 }
343 else /* nid == NID_X9_62_characteristic_two_field */
344 #ifdef OPENSSL_NO_EC2M
345 {
346 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
347 goto err;
348 }
349 #else
350 {
351 int field_type;
352 X9_62_CHARACTERISTIC_TWO *char_two;
353
354 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
355 char_two = field->p.char_two;
356
357 if (char_two == NULL)
358 {
359 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
360 goto err;
361 }
362
363 char_two->m = (long)EC_GROUP_get_degree(group);
364
365 field_type = EC_GROUP_get_basis_type(group);
366
367 if (field_type == 0)
368 {
369 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
370 goto err;
371 }
372 /* set base type OID */
373 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL)
374 {
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 {
381 unsigned int k;
382
383 if (!EC_GROUP_get_trinomial_basis(group, &k))
384 goto err;
385
386 char_two->p.tpBasis = ASN1_INTEGER_new();
387 if (!char_two->p.tpBasis)
388 {
389 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
390 goto err;
391 }
392 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k))
393 {
394 ECerr(EC_F_EC_ASN1_GROUP2FIELDID,
395 ERR_R_ASN1_LIB);
396 goto err;
397 }
398 }
399 else if (field_type == NID_X9_62_ppBasis)
400 {
401 unsigned int k1, k2, k3;
402
403 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
404 goto err;
405
406 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
407 if (!char_two->p.ppBasis)
408 {
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 }
418 else /* field_type == NID_X9_62_onBasis */
419 {
420 /* for ONB the parameters are (asn1) NULL */
421 char_two->p.onBasis = ASN1_NULL_new();
422 if (!char_two->p.onBasis)
423 {
424 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
425 goto err;
426 }
427 }
428 }
429 #endif
430
431 ok = 1;
432
433 err : if (tmp)
434 BN_free(tmp);
435 return(ok);
436 }
437
438 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
439 {
440 int ok=0, nid;
441 BIGNUM *tmp_1=NULL, *tmp_2=NULL;
442 unsigned char *buffer_1=NULL, *buffer_2=NULL,
443 *a_buf=NULL, *b_buf=NULL;
444 size_t len_1, len_2;
445 unsigned char char_zero = 0;
446
447 if (!group || !curve || !curve->a || !curve->b)
448 return 0;
449
450 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL)
451 {
452 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
453 goto err;
454 }
455
456 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
457
458 /* get a and b */
459 if (nid == NID_X9_62_prime_field)
460 {
461 if (!EC_GROUP_get_curve_GFp(group, NULL, tmp_1, tmp_2, NULL))
462 {
463 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
464 goto err;
465 }
466 }
467 #ifndef OPENSSL_NO_EC2M
468 else /* nid == NID_X9_62_characteristic_two_field */
469 {
470 if (!EC_GROUP_get_curve_GF2m(group, NULL, tmp_1, tmp_2, NULL))
471 {
472 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
473 goto err;
474 }
475 }
476 #endif
477 len_1 = (size_t)BN_num_bytes(tmp_1);
478 len_2 = (size_t)BN_num_bytes(tmp_2);
479
480 if (len_1 == 0)
481 {
482 /* len_1 == 0 => a == 0 */
483 a_buf = &char_zero;
484 len_1 = 1;
485 }
486 else
487 {
488 if ((buffer_1 = OPENSSL_malloc(len_1)) == NULL)
489 {
490 ECerr(EC_F_EC_ASN1_GROUP2CURVE,
491 ERR_R_MALLOC_FAILURE);
492 goto err;
493 }
494 if ( (len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0)
495 {
496 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
497 goto err;
498 }
499 a_buf = buffer_1;
500 }
501
502 if (len_2 == 0)
503 {
504 /* len_2 == 0 => b == 0 */
505 b_buf = &char_zero;
506 len_2 = 1;
507 }
508 else
509 {
510 if ((buffer_2 = OPENSSL_malloc(len_2)) == NULL)
511 {
512 ECerr(EC_F_EC_ASN1_GROUP2CURVE,
513 ERR_R_MALLOC_FAILURE);
514 goto err;
515 }
516 if ( (len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0)
517 {
518 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
519 goto err;
520 }
521 b_buf = buffer_2;
522 }
523
524 /* set a and b */
525 if (!M_ASN1_OCTET_STRING_set(curve->a, a_buf, len_1) ||
526 !M_ASN1_OCTET_STRING_set(curve->b, b_buf, len_2))
527 {
528 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
529 goto err;
530 }
531
532 /* set the seed (optional) */
533 if (group->seed)
534 {
535 if (!curve->seed)
536 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL)
537 {
538 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
539 goto err;
540 }
541 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
542 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
543 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
544 (int)group->seed_len))
545 {
546 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
547 goto err;
548 }
549 }
550 else
551 {
552 if (curve->seed)
553 {
554 ASN1_BIT_STRING_free(curve->seed);
555 curve->seed = NULL;
556 }
557 }
558
559 ok = 1;
560
561 err: if (buffer_1)
562 OPENSSL_free(buffer_1);
563 if (buffer_2)
564 OPENSSL_free(buffer_2);
565 if (tmp_1)
566 BN_free(tmp_1);
567 if (tmp_2)
568 BN_free(tmp_2);
569 return(ok);
570 }
571
572 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *group,
573 ECPARAMETERS *param)
574 {
575 int ok=0;
576 size_t len=0;
577 ECPARAMETERS *ret=NULL;
578 BIGNUM *tmp=NULL;
579 unsigned char *buffer=NULL;
580 const EC_POINT *point=NULL;
581 point_conversion_form_t form;
582
583 if ((tmp = BN_new()) == NULL)
584 {
585 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
586 goto err;
587 }
588
589 if (param == NULL)
590 {
591 if ((ret = ECPARAMETERS_new()) == NULL)
592 {
593 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS,
594 ERR_R_MALLOC_FAILURE);
595 goto err;
596 }
597 }
598 else
599 ret = param;
600
601 /* set the version (always one) */
602 ret->version = (long)0x1;
603
604 /* set the fieldID */
605 if (!ec_asn1_group2fieldid(group, ret->fieldID))
606 {
607 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
608 goto err;
609 }
610
611 /* set the curve */
612 if (!ec_asn1_group2curve(group, ret->curve))
613 {
614 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
615 goto err;
616 }
617
618 /* set the base point */
619 if ((point = EC_GROUP_get0_generator(group)) == NULL)
620 {
621 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, EC_R_UNDEFINED_GENERATOR);
622 goto err;
623 }
624
625 form = EC_GROUP_get_point_conversion_form(group);
626
627 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
628 if (len == 0)
629 {
630 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
631 goto err;
632 }
633 if ((buffer = OPENSSL_malloc(len)) == NULL)
634 {
635 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
636 goto err;
637 }
638 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL))
639 {
640 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
641 goto err;
642 }
643 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL)
644 {
645 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_MALLOC_FAILURE);
646 goto err;
647 }
648 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len))
649 {
650 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
651 goto err;
652 }
653
654 /* set the order */
655 if (!EC_GROUP_get_order(group, tmp, NULL))
656 {
657 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_EC_LIB);
658 goto err;
659 }
660 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
661 if (ret->order == NULL)
662 {
663 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
664 goto err;
665 }
666
667 /* set the cofactor (optional) */
668 if (EC_GROUP_get_cofactor(group, tmp, NULL))
669 {
670 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
671 if (ret->cofactor == NULL)
672 {
673 ECerr(EC_F_EC_ASN1_GROUP2PARAMETERS, ERR_R_ASN1_LIB);
674 goto err;
675 }
676 }
677
678 ok = 1;
679
680 err : if(!ok)
681 {
682 if (ret && !param)
683 ECPARAMETERS_free(ret);
684 ret = NULL;
685 }
686 if (tmp)
687 BN_free(tmp);
688 if (buffer)
689 OPENSSL_free(buffer);
690 return(ret);
691 }
692
693 ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
694 ECPKPARAMETERS *params)
695 {
696 int ok = 1, tmp;
697 ECPKPARAMETERS *ret = params;
698
699 if (ret == NULL)
700 {
701 if ((ret = ECPKPARAMETERS_new()) == NULL)
702 {
703 ECerr(EC_F_EC_ASN1_GROUP2PKPARAMETERS,
704 ERR_R_MALLOC_FAILURE);
705 return NULL;
706 }
707 }
708 else
709 {
710 if (ret->type == 0 && ret->value.named_curve)
711 ASN1_OBJECT_free(ret->value.named_curve);
712 else if (ret->type == 1 && ret->value.parameters)
713 ECPARAMETERS_free(ret->value.parameters);
714 }
715
716 if (EC_GROUP_get_asn1_flag(group))
717 {
718 /* use the asn1 OID to describe the
719 * the elliptic curve parameters
720 */
721 tmp = EC_GROUP_get_curve_name(group);
722 if (tmp)
723 {
724 ret->type = 0;
725 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
726 ok = 0;
727 }
728 else
729 /* we don't kmow the nid => ERROR */
730 ok = 0;
731 }
732 else
733 {
734 /* use the ECPARAMETERS structure */
735 ret->type = 1;
736 if ((ret->value.parameters = ec_asn1_group2parameters(
737 group, NULL)) == NULL)
738 ok = 0;
739 }
740
741 if (!ok)
742 {
743 ECPKPARAMETERS_free(ret);
744 return NULL;
745 }
746 return ret;
747 }
748
749 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *params)
750 {
751 int ok = 0, tmp;
752 EC_GROUP *ret = NULL;
753 BIGNUM *p = NULL, *a = NULL, *b = NULL;
754 EC_POINT *point=NULL;
755 long field_bits;
756
757 if (!params->fieldID || !params->fieldID->fieldType ||
758 !params->fieldID->p.ptr)
759 {
760 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
761 goto err;
762 }
763
764 /* now extract the curve parameters a and b */
765 if (!params->curve || !params->curve->a ||
766 !params->curve->a->data || !params->curve->b ||
767 !params->curve->b->data)
768 {
769 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
770 goto err;
771 }
772 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
773 if (a == NULL)
774 {
775 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
776 goto err;
777 }
778 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
779 if (b == NULL)
780 {
781 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_BN_LIB);
782 goto err;
783 }
784
785 /* get the field parameters */
786 tmp = OBJ_obj2nid(params->fieldID->fieldType);
787 if (tmp == NID_X9_62_characteristic_two_field)
788 #ifdef OPENSSL_NO_EC2M
789 {
790 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_GF2M_NOT_SUPPORTED);
791 goto err;
792 }
793 #else
794 {
795 X9_62_CHARACTERISTIC_TWO *char_two;
796
797 char_two = params->fieldID->p.char_two;
798
799 field_bits = char_two->m;
800 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS)
801 {
802 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
803 goto err;
804 }
805
806 if ((p = BN_new()) == NULL)
807 {
808 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_MALLOC_FAILURE);
809 goto err;
810 }
811
812 /* get the base type */
813 tmp = OBJ_obj2nid(char_two->type);
814
815 if (tmp == NID_X9_62_tpBasis)
816 {
817 long tmp_long;
818
819 if (!char_two->p.tpBasis)
820 {
821 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
822 goto err;
823 }
824
825 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
826
827 if (!(char_two->m > tmp_long && tmp_long > 0))
828 {
829 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_TRINOMIAL_BASIS);
830 goto err;
831 }
832
833 /* create the polynomial */
834 if (!BN_set_bit(p, (int)char_two->m))
835 goto err;
836 if (!BN_set_bit(p, (int)tmp_long))
837 goto err;
838 if (!BN_set_bit(p, 0))
839 goto err;
840 }
841 else if (tmp == NID_X9_62_ppBasis)
842 {
843 X9_62_PENTANOMIAL *penta;
844
845 penta = char_two->p.ppBasis;
846 if (!penta)
847 {
848 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
849 goto err;
850 }
851
852 if (!(char_two->m > penta->k3 && penta->k3 > penta->k2 && penta->k2 > penta->k1 && penta->k1 > 0))
853 {
854 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_PENTANOMIAL_BASIS);
855 goto err;
856 }
857
858 /* create the polynomial */
859 if (!BN_set_bit(p, (int)char_two->m)) goto err;
860 if (!BN_set_bit(p, (int)penta->k1)) goto err;
861 if (!BN_set_bit(p, (int)penta->k2)) goto err;
862 if (!BN_set_bit(p, (int)penta->k3)) goto err;
863 if (!BN_set_bit(p, 0)) goto err;
864 }
865 else if (tmp == NID_X9_62_onBasis)
866 {
867 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_NOT_IMPLEMENTED);
868 goto err;
869 }
870 else /* error */
871 {
872 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
873 goto err;
874 }
875
876 /* create the EC_GROUP structure */
877 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
878 }
879 #endif
880 else if (tmp == NID_X9_62_prime_field)
881 {
882 /* we have a curve over a prime field */
883 /* extract the prime number */
884 if (!params->fieldID->p.prime)
885 {
886 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
887 goto err;
888 }
889 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
890 if (p == NULL)
891 {
892 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
893 goto err;
894 }
895
896 if (BN_is_negative(p) || BN_is_zero(p))
897 {
898 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
899 goto err;
900 }
901
902 field_bits = BN_num_bits(p);
903 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS)
904 {
905 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_FIELD_TOO_LARGE);
906 goto err;
907 }
908
909 /* create the EC_GROUP structure */
910 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
911 }
912 else
913 {
914 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_FIELD);
915 goto err;
916 }
917
918 if (ret == NULL)
919 {
920 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
921 goto err;
922 }
923
924 /* extract seed (optional) */
925 if (params->curve->seed != NULL)
926 {
927 if (ret->seed != NULL)
928 OPENSSL_free(ret->seed);
929 if (!(ret->seed = OPENSSL_malloc(params->curve->seed->length)))
930 {
931 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP,
932 ERR_R_MALLOC_FAILURE);
933 goto err;
934 }
935 memcpy(ret->seed, params->curve->seed->data,
936 params->curve->seed->length);
937 ret->seed_len = params->curve->seed->length;
938 }
939
940 if (!params->order || !params->base || !params->base->data)
941 {
942 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_ASN1_ERROR);
943 goto err;
944 }
945
946 if ((point = EC_POINT_new(ret)) == NULL) goto err;
947
948 /* set the point conversion form */
949 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
950 (params->base->data[0] & ~0x01));
951
952 /* extract the ec point */
953 if (!EC_POINT_oct2point(ret, point, params->base->data,
954 params->base->length, NULL))
955 {
956 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
957 goto err;
958 }
959
960 /* extract the order */
961 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL)
962 {
963 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
964 goto err;
965 }
966 if (BN_is_negative(a) || BN_is_zero(a))
967 {
968 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
969 goto err;
970 }
971 if (BN_num_bits(a) > (int)field_bits + 1) /* Hasse bound */
972 {
973 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, EC_R_INVALID_GROUP_ORDER);
974 goto err;
975 }
976
977 /* extract the cofactor (optional) */
978 if (params->cofactor == NULL)
979 {
980 if (b)
981 {
982 BN_free(b);
983 b = NULL;
984 }
985 }
986 else
987 if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL)
988 {
989 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_ASN1_LIB);
990 goto err;
991 }
992 /* set the generator, order and cofactor (if present) */
993 if (!EC_GROUP_set_generator(ret, point, a, b))
994 {
995 ECerr(EC_F_EC_ASN1_PARAMETERS2GROUP, ERR_R_EC_LIB);
996 goto err;
997 }
998
999 ok = 1;
1000
1001 err: if (!ok)
1002 {
1003 if (ret)
1004 EC_GROUP_clear_free(ret);
1005 ret = NULL;
1006 }
1007
1008 if (p)
1009 BN_free(p);
1010 if (a)
1011 BN_free(a);
1012 if (b)
1013 BN_free(b);
1014 if (point)
1015 EC_POINT_free(point);
1016 return(ret);
1017 }
1018
1019 EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params)
1020 {
1021 EC_GROUP *ret=NULL;
1022 int tmp=0;
1023
1024 if (params == NULL)
1025 {
1026 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
1027 EC_R_MISSING_PARAMETERS);
1028 return NULL;
1029 }
1030
1031 if (params->type == 0)
1032 { /* the curve is given by an OID */
1033 tmp = OBJ_obj2nid(params->value.named_curve);
1034 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL)
1035 {
1036 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP,
1037 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
1038 return NULL;
1039 }
1040 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
1041 }
1042 else if (params->type == 1)
1043 { /* the parameters are given by a ECPARAMETERS
1044 * structure */
1045 ret = ec_asn1_parameters2group(params->value.parameters);
1046 if (!ret)
1047 {
1048 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, ERR_R_EC_LIB);
1049 return NULL;
1050 }
1051 EC_GROUP_set_asn1_flag(ret, 0x0);
1052 }
1053 else if (params->type == 2)
1054 { /* implicitlyCA */
1055 return NULL;
1056 }
1057 else
1058 {
1059 ECerr(EC_F_EC_ASN1_PKPARAMETERS2GROUP, EC_R_ASN1_ERROR);
1060 return NULL;
1061 }
1062
1063 return ret;
1064 }
1065
1066 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
1067
1068 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
1069 {
1070 EC_GROUP *group = NULL;
1071 ECPKPARAMETERS *params = NULL;
1072
1073 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL)
1074 {
1075 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
1076 ECPKPARAMETERS_free(params);
1077 return NULL;
1078 }
1079
1080 if ((group = ec_asn1_pkparameters2group(params)) == NULL)
1081 {
1082 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
1083 ECPKPARAMETERS_free(params);
1084 return NULL;
1085 }
1086
1087
1088 if (a && *a)
1089 EC_GROUP_clear_free(*a);
1090 if (a)
1091 *a = group;
1092
1093 ECPKPARAMETERS_free(params);
1094 return(group);
1095 }
1096
1097 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
1098 {
1099 int ret=0;
1100 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
1101 if (tmp == NULL)
1102 {
1103 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
1104 return 0;
1105 }
1106 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0)
1107 {
1108 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
1109 ECPKPARAMETERS_free(tmp);
1110 return 0;
1111 }
1112 ECPKPARAMETERS_free(tmp);
1113 return(ret);
1114 }
1115
1116 /* some EC_KEY functions */
1117
1118 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
1119 {
1120 int ok=0;
1121 EC_KEY *ret=NULL;
1122 EC_PRIVATEKEY *priv_key=NULL;
1123
1124 if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
1125 {
1126 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1127 return NULL;
1128 }
1129
1130 if ((priv_key = d2i_EC_PRIVATEKEY(&priv_key, in, len)) == NULL)
1131 {
1132 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1133 EC_PRIVATEKEY_free(priv_key);
1134 return NULL;
1135 }
1136
1137 if (a == NULL || *a == NULL)
1138 {
1139 if ((ret = EC_KEY_new()) == NULL)
1140 {
1141 ECerr(EC_F_D2I_ECPRIVATEKEY,
1142 ERR_R_MALLOC_FAILURE);
1143 goto err;
1144 }
1145 if (a)
1146 *a = ret;
1147 }
1148 else
1149 ret = *a;
1150
1151 if (priv_key->parameters)
1152 {
1153 if (ret->group)
1154 EC_GROUP_clear_free(ret->group);
1155 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1156 }
1157
1158 if (ret->group == NULL)
1159 {
1160 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1161 goto err;
1162 }
1163
1164 ret->version = priv_key->version;
1165
1166 if (priv_key->privateKey)
1167 {
1168 ret->priv_key = BN_bin2bn(
1169 M_ASN1_STRING_data(priv_key->privateKey),
1170 M_ASN1_STRING_length(priv_key->privateKey),
1171 ret->priv_key);
1172 if (ret->priv_key == NULL)
1173 {
1174 ECerr(EC_F_D2I_ECPRIVATEKEY,
1175 ERR_R_BN_LIB);
1176 goto err;
1177 }
1178 }
1179 else
1180 {
1181 ECerr(EC_F_D2I_ECPRIVATEKEY,
1182 EC_R_MISSING_PRIVATE_KEY);
1183 goto err;
1184 }
1185
1186 if (ret->pub_key)
1187 EC_POINT_clear_free(ret->pub_key);
1188 ret->pub_key = EC_POINT_new(ret->group);
1189 if (ret->pub_key == NULL)
1190 {
1191 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1192 goto err;
1193 }
1194
1195 if (priv_key->publicKey)
1196 {
1197 const unsigned char *pub_oct;
1198 size_t pub_oct_len;
1199
1200 pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
1201 pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
1202 /* save the point conversion form */
1203 ret->conv_form = (point_conversion_form_t)(pub_oct[0] & ~0x01);
1204 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1205 pub_oct, pub_oct_len, NULL))
1206 {
1207 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1208 goto err;
1209 }
1210 }
1211 else
1212 {
1213 if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key, NULL, NULL, NULL))
1214 {
1215 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1216 goto err;
1217 }
1218 /* Remember the original private-key-only encoding. */
1219 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1220 }
1221
1222 ok = 1;
1223 err:
1224 if (!ok)
1225 {
1226 if (ret)
1227 EC_KEY_free(ret);
1228 ret = NULL;
1229 }
1230
1231 if (priv_key)
1232 EC_PRIVATEKEY_free(priv_key);
1233
1234 return(ret);
1235 }
1236
1237 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1238 {
1239 int ret=0, ok=0;
1240 unsigned char *buffer=NULL;
1241 size_t buf_len=0, tmp_len;
1242 EC_PRIVATEKEY *priv_key=NULL;
1243
1244 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1245 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL))
1246 {
1247 ECerr(EC_F_I2D_ECPRIVATEKEY,
1248 ERR_R_PASSED_NULL_PARAMETER);
1249 goto err;
1250 }
1251
1252 if ((priv_key = EC_PRIVATEKEY_new()) == NULL)
1253 {
1254 ECerr(EC_F_I2D_ECPRIVATEKEY,
1255 ERR_R_MALLOC_FAILURE);
1256 goto err;
1257 }
1258
1259 priv_key->version = a->version;
1260
1261 buf_len = (size_t)BN_num_bytes(a->priv_key);
1262 buffer = OPENSSL_malloc(buf_len);
1263 if (buffer == NULL)
1264 {
1265 ECerr(EC_F_I2D_ECPRIVATEKEY,
1266 ERR_R_MALLOC_FAILURE);
1267 goto err;
1268 }
1269
1270 if (!BN_bn2bin(a->priv_key, buffer))
1271 {
1272 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_BN_LIB);
1273 goto err;
1274 }
1275
1276 if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len))
1277 {
1278 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1279 goto err;
1280 }
1281
1282 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS))
1283 {
1284 if ((priv_key->parameters = ec_asn1_group2pkparameters(
1285 a->group, priv_key->parameters)) == NULL)
1286 {
1287 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1288 goto err;
1289 }
1290 }
1291
1292 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY))
1293 {
1294 priv_key->publicKey = M_ASN1_BIT_STRING_new();
1295 if (priv_key->publicKey == NULL)
1296 {
1297 ECerr(EC_F_I2D_ECPRIVATEKEY,
1298 ERR_R_MALLOC_FAILURE);
1299 goto err;
1300 }
1301
1302 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1303 a->conv_form, NULL, 0, NULL);
1304
1305 if (tmp_len > buf_len)
1306 {
1307 unsigned char *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
1308 if (!tmp_buffer)
1309 {
1310 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1311 goto err;
1312 }
1313 buffer = tmp_buffer;
1314 buf_len = tmp_len;
1315 }
1316
1317 if (!EC_POINT_point2oct(a->group, a->pub_key,
1318 a->conv_form, buffer, buf_len, NULL))
1319 {
1320 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1321 goto err;
1322 }
1323
1324 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07);
1325 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1326 if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer,
1327 buf_len))
1328 {
1329 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_ASN1_LIB);
1330 goto err;
1331 }
1332 }
1333
1334 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0)
1335 {
1336 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1337 goto err;
1338 }
1339 ok=1;
1340 err:
1341 if (buffer)
1342 OPENSSL_free(buffer);
1343 if (priv_key)
1344 EC_PRIVATEKEY_free(priv_key);
1345 return(ok?ret:0);
1346 }
1347
1348 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1349 {
1350 if (a == NULL)
1351 {
1352 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1353 return 0;
1354 }
1355 return i2d_ECPKParameters(a->group, out);
1356 }
1357
1358 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1359 {
1360 EC_KEY *ret;
1361
1362 if (in == NULL || *in == NULL)
1363 {
1364 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1365 return NULL;
1366 }
1367
1368 if (a == NULL || *a == NULL)
1369 {
1370 if ((ret = EC_KEY_new()) == NULL)
1371 {
1372 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1373 return NULL;
1374 }
1375 if (a)
1376 *a = ret;
1377 }
1378 else
1379 ret = *a;
1380
1381 if (!d2i_ECPKParameters(&ret->group, in, len))
1382 {
1383 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1384 return NULL;
1385 }
1386
1387 return ret;
1388 }
1389
1390 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1391 {
1392 EC_KEY *ret=NULL;
1393
1394 if (a == NULL || (*a) == NULL || (*a)->group == NULL)
1395 {
1396 /* sorry, but a EC_GROUP-structur is necessary
1397 * to set the public key */
1398 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1399 return 0;
1400 }
1401 ret = *a;
1402 if (ret->pub_key == NULL &&
1403 (ret->pub_key = EC_POINT_new(ret->group)) == NULL)
1404 {
1405 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1406 return 0;
1407 }
1408 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL))
1409 {
1410 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1411 return 0;
1412 }
1413 /* save the point conversion form */
1414 ret->conv_form = (point_conversion_form_t)(*in[0] & ~0x01);
1415 *in += len;
1416 return ret;
1417 }
1418
1419 int i2o_ECPublicKey(EC_KEY *a, unsigned char **out)
1420 {
1421 size_t buf_len=0;
1422 int new_buffer = 0;
1423
1424 if (a == NULL)
1425 {
1426 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1427 return 0;
1428 }
1429
1430 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1431 a->conv_form, NULL, 0, NULL);
1432
1433 if (out == NULL || buf_len == 0)
1434 /* out == NULL => just return the length of the octet string */
1435 return buf_len;
1436
1437 if (*out == NULL)
1438 {
1439 if ((*out = OPENSSL_malloc(buf_len)) == NULL)
1440 {
1441 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1442 return 0;
1443 }
1444 new_buffer = 1;
1445 }
1446 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1447 *out, buf_len, NULL))
1448 {
1449 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1450 if (new_buffer)
1451 {
1452 OPENSSL_free(*out);
1453 *out = NULL;
1454 }
1455 return 0;
1456 }
1457 if (!new_buffer)
1458 *out += buf_len;
1459 return buf_len;
1460 }
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