1 /* $OpenBSD: ec_asn1.c,v 1.37 2022/05/24 20:06:32 tb Exp $ */
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
61 #include <openssl/opensslconf.h>
62
63 #include <openssl/err.h>
64 #include <openssl/asn1t.h>
65 #include <openssl/objects.h>
66
67 #include "asn1_locl.h"
68 #include "ec_lcl.h"
69
70 int
EC_GROUP_get_basis_type(const EC_GROUP * group)71 EC_GROUP_get_basis_type(const EC_GROUP * group)
72 {
73 int i = 0;
74
75 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
76 NID_X9_62_characteristic_two_field)
77 /* everything else is currently not supported */
78 return 0;
79
80 while (group->poly[i] != 0)
81 i++;
82
83 if (i == 4)
84 return NID_X9_62_ppBasis;
85 else if (i == 2)
86 return NID_X9_62_tpBasis;
87 else
88 /* everything else is currently not supported */
89 return 0;
90 }
91
92 #ifndef OPENSSL_NO_EC2M
93 int
EC_GROUP_get_trinomial_basis(const EC_GROUP * group,unsigned int * k)94 EC_GROUP_get_trinomial_basis(const EC_GROUP * group, unsigned int *k)
95 {
96 if (group == NULL)
97 return 0;
98
99 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
100 NID_X9_62_characteristic_two_field
101 || !((group->poly[0] != 0) && (group->poly[1] != 0) && (group->poly[2] == 0))) {
102 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
103 return 0;
104 }
105 if (k)
106 *k = group->poly[1];
107
108 return 1;
109 }
110
111 int
EC_GROUP_get_pentanomial_basis(const EC_GROUP * group,unsigned int * k1,unsigned int * k2,unsigned int * k3)112 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) && (group->poly[2] != 0) && (group->poly[3] != 0) && (group->poly[4] == 0))) {
121 ECerror(ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
122 return 0;
123 }
124 if (k1)
125 *k1 = group->poly[3];
126 if (k2)
127 *k2 = group->poly[2];
128 if (k3)
129 *k3 = group->poly[1];
130
131 return 1;
132 }
133 #endif
134
135 /* some structures needed for the asn1 encoding */
136 typedef struct x9_62_pentanomial_st {
137 long k1;
138 long k2;
139 long k3;
140 } X9_62_PENTANOMIAL;
141
142 typedef struct x9_62_characteristic_two_st {
143 long m;
144 ASN1_OBJECT *type;
145 union {
146 char *ptr;
147 /* NID_X9_62_onBasis */
148 ASN1_NULL *onBasis;
149 /* NID_X9_62_tpBasis */
150 ASN1_INTEGER *tpBasis;
151 /* NID_X9_62_ppBasis */
152 X9_62_PENTANOMIAL *ppBasis;
153 /* anything else */
154 ASN1_TYPE *other;
155 } p;
156 } X9_62_CHARACTERISTIC_TWO;
157
158 typedef struct x9_62_fieldid_st {
159 ASN1_OBJECT *fieldType;
160 union {
161 char *ptr;
162 /* NID_X9_62_prime_field */
163 ASN1_INTEGER *prime;
164 /* NID_X9_62_characteristic_two_field */
165 X9_62_CHARACTERISTIC_TWO *char_two;
166 /* anything else */
167 ASN1_TYPE *other;
168 } p;
169 } X9_62_FIELDID;
170
171 typedef struct x9_62_curve_st {
172 ASN1_OCTET_STRING *a;
173 ASN1_OCTET_STRING *b;
174 ASN1_BIT_STRING *seed;
175 } X9_62_CURVE;
176
177 typedef struct ec_parameters_st {
178 long version;
179 X9_62_FIELDID *fieldID;
180 X9_62_CURVE *curve;
181 ASN1_OCTET_STRING *base;
182 ASN1_INTEGER *order;
183 ASN1_INTEGER *cofactor;
184 } ECPARAMETERS;
185
186 struct ecpk_parameters_st {
187 int type;
188 union {
189 ASN1_OBJECT *named_curve;
190 ECPARAMETERS *parameters;
191 ASN1_NULL *implicitlyCA;
192 } value;
193 } /* ECPKPARAMETERS */ ;
194
195 /* SEC1 ECPrivateKey */
196 typedef struct ec_privatekey_st {
197 long version;
198 ASN1_OCTET_STRING *privateKey;
199 ECPKPARAMETERS *parameters;
200 ASN1_BIT_STRING *publicKey;
201 } EC_PRIVATEKEY;
202
203 /* the OpenSSL ASN.1 definitions */
204 static const ASN1_TEMPLATE X9_62_PENTANOMIAL_seq_tt[] = {
205 {
206 .flags = 0,
207 .tag = 0,
208 .offset = offsetof(X9_62_PENTANOMIAL, k1),
209 .field_name = "k1",
210 .item = &LONG_it,
211 },
212 {
213 .flags = 0,
214 .tag = 0,
215 .offset = offsetof(X9_62_PENTANOMIAL, k2),
216 .field_name = "k2",
217 .item = &LONG_it,
218 },
219 {
220 .flags = 0,
221 .tag = 0,
222 .offset = offsetof(X9_62_PENTANOMIAL, k3),
223 .field_name = "k3",
224 .item = &LONG_it,
225 },
226 };
227
228 const ASN1_ITEM X9_62_PENTANOMIAL_it = {
229 .itype = ASN1_ITYPE_SEQUENCE,
230 .utype = V_ASN1_SEQUENCE,
231 .templates = X9_62_PENTANOMIAL_seq_tt,
232 .tcount = sizeof(X9_62_PENTANOMIAL_seq_tt) / sizeof(ASN1_TEMPLATE),
233 .funcs = NULL,
234 .size = sizeof(X9_62_PENTANOMIAL),
235 .sname = "X9_62_PENTANOMIAL",
236 };
237
238 X9_62_PENTANOMIAL *X9_62_PENTANOMIAL_new(void);
239 void X9_62_PENTANOMIAL_free(X9_62_PENTANOMIAL *a);
240
241 X9_62_PENTANOMIAL *
X9_62_PENTANOMIAL_new(void)242 X9_62_PENTANOMIAL_new(void)
243 {
244 return (X9_62_PENTANOMIAL*)ASN1_item_new(&X9_62_PENTANOMIAL_it);
245 }
246
247 void
X9_62_PENTANOMIAL_free(X9_62_PENTANOMIAL * a)248 X9_62_PENTANOMIAL_free(X9_62_PENTANOMIAL *a)
249 {
250 ASN1_item_free((ASN1_VALUE *)a, &X9_62_PENTANOMIAL_it);
251 }
252
253 static const ASN1_TEMPLATE char_two_def_tt = {
254 .flags = 0,
255 .tag = 0,
256 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.other),
257 .field_name = "p.other",
258 .item = &ASN1_ANY_it,
259 };
260
261 static const ASN1_ADB_TABLE X9_62_CHARACTERISTIC_TWO_adbtbl[] = {
262 {
263 .value = NID_X9_62_onBasis,
264 .tt = {
265 .flags = 0,
266 .tag = 0,
267 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.onBasis),
268 .field_name = "p.onBasis",
269 .item = &ASN1_NULL_it,
270 },
271
272 },
273 {
274 .value = NID_X9_62_tpBasis,
275 .tt = {
276 .flags = 0,
277 .tag = 0,
278 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.tpBasis),
279 .field_name = "p.tpBasis",
280 .item = &ASN1_INTEGER_it,
281 },
282
283 },
284 {
285 .value = NID_X9_62_ppBasis,
286 .tt = {
287 .flags = 0,
288 .tag = 0,
289 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, p.ppBasis),
290 .field_name = "p.ppBasis",
291 .item = &X9_62_PENTANOMIAL_it,
292 },
293
294 },
295 };
296
297 static const ASN1_ADB X9_62_CHARACTERISTIC_TWO_adb = {
298 .flags = 0,
299 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, type),
300 .tbl = X9_62_CHARACTERISTIC_TWO_adbtbl,
301 .tblcount = sizeof(X9_62_CHARACTERISTIC_TWO_adbtbl) / sizeof(ASN1_ADB_TABLE),
302 .default_tt = &char_two_def_tt,
303 .null_tt = NULL,
304 };
305
306 static const ASN1_TEMPLATE X9_62_CHARACTERISTIC_TWO_seq_tt[] = {
307 {
308 .flags = 0,
309 .tag = 0,
310 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, m),
311 .field_name = "m",
312 .item = &LONG_it,
313 },
314 {
315 .flags = 0,
316 .tag = 0,
317 .offset = offsetof(X9_62_CHARACTERISTIC_TWO, type),
318 .field_name = "type",
319 .item = &ASN1_OBJECT_it,
320 },
321 {
322 .flags = ASN1_TFLG_ADB_OID,
323 .tag = -1,
324 .offset = 0,
325 .field_name = "X9_62_CHARACTERISTIC_TWO",
326 .item = (const ASN1_ITEM *)&X9_62_CHARACTERISTIC_TWO_adb,
327 },
328 };
329
330 const ASN1_ITEM X9_62_CHARACTERISTIC_TWO_it = {
331 .itype = ASN1_ITYPE_SEQUENCE,
332 .utype = V_ASN1_SEQUENCE,
333 .templates = X9_62_CHARACTERISTIC_TWO_seq_tt,
334 .tcount = sizeof(X9_62_CHARACTERISTIC_TWO_seq_tt) / sizeof(ASN1_TEMPLATE),
335 .funcs = NULL,
336 .size = sizeof(X9_62_CHARACTERISTIC_TWO),
337 .sname = "X9_62_CHARACTERISTIC_TWO",
338 };
339
340 X9_62_CHARACTERISTIC_TWO *X9_62_CHARACTERISTIC_TWO_new(void);
341 void X9_62_CHARACTERISTIC_TWO_free(X9_62_CHARACTERISTIC_TWO *a);
342
343 X9_62_CHARACTERISTIC_TWO *
X9_62_CHARACTERISTIC_TWO_new(void)344 X9_62_CHARACTERISTIC_TWO_new(void)
345 {
346 return (X9_62_CHARACTERISTIC_TWO*)ASN1_item_new(&X9_62_CHARACTERISTIC_TWO_it);
347 }
348
349 void
X9_62_CHARACTERISTIC_TWO_free(X9_62_CHARACTERISTIC_TWO * a)350 X9_62_CHARACTERISTIC_TWO_free(X9_62_CHARACTERISTIC_TWO *a)
351 {
352 ASN1_item_free((ASN1_VALUE *)a, &X9_62_CHARACTERISTIC_TWO_it);
353 }
354
355 static const ASN1_TEMPLATE fieldID_def_tt = {
356 .flags = 0,
357 .tag = 0,
358 .offset = offsetof(X9_62_FIELDID, p.other),
359 .field_name = "p.other",
360 .item = &ASN1_ANY_it,
361 };
362
363 static const ASN1_ADB_TABLE X9_62_FIELDID_adbtbl[] = {
364 {
365 .value = NID_X9_62_prime_field,
366 .tt = {
367 .flags = 0,
368 .tag = 0,
369 .offset = offsetof(X9_62_FIELDID, p.prime),
370 .field_name = "p.prime",
371 .item = &ASN1_INTEGER_it,
372 },
373
374 },
375 {
376 .value = NID_X9_62_characteristic_two_field,
377 .tt = {
378 .flags = 0,
379 .tag = 0,
380 .offset = offsetof(X9_62_FIELDID, p.char_two),
381 .field_name = "p.char_two",
382 .item = &X9_62_CHARACTERISTIC_TWO_it,
383 },
384
385 },
386 };
387
388 static const ASN1_ADB X9_62_FIELDID_adb = {
389 .flags = 0,
390 .offset = offsetof(X9_62_FIELDID, fieldType),
391 .tbl = X9_62_FIELDID_adbtbl,
392 .tblcount = sizeof(X9_62_FIELDID_adbtbl) / sizeof(ASN1_ADB_TABLE),
393 .default_tt = &fieldID_def_tt,
394 .null_tt = NULL,
395 };
396
397 static const ASN1_TEMPLATE X9_62_FIELDID_seq_tt[] = {
398 {
399 .flags = 0,
400 .tag = 0,
401 .offset = offsetof(X9_62_FIELDID, fieldType),
402 .field_name = "fieldType",
403 .item = &ASN1_OBJECT_it,
404 },
405 {
406 .flags = ASN1_TFLG_ADB_OID,
407 .tag = -1,
408 .offset = 0,
409 .field_name = "X9_62_FIELDID",
410 .item = (const ASN1_ITEM *)&X9_62_FIELDID_adb,
411 },
412 };
413
414 const ASN1_ITEM X9_62_FIELDID_it = {
415 .itype = ASN1_ITYPE_SEQUENCE,
416 .utype = V_ASN1_SEQUENCE,
417 .templates = X9_62_FIELDID_seq_tt,
418 .tcount = sizeof(X9_62_FIELDID_seq_tt) / sizeof(ASN1_TEMPLATE),
419 .funcs = NULL,
420 .size = sizeof(X9_62_FIELDID),
421 .sname = "X9_62_FIELDID",
422 };
423
424 static const ASN1_TEMPLATE X9_62_CURVE_seq_tt[] = {
425 {
426 .flags = 0,
427 .tag = 0,
428 .offset = offsetof(X9_62_CURVE, a),
429 .field_name = "a",
430 .item = &ASN1_OCTET_STRING_it,
431 },
432 {
433 .flags = 0,
434 .tag = 0,
435 .offset = offsetof(X9_62_CURVE, b),
436 .field_name = "b",
437 .item = &ASN1_OCTET_STRING_it,
438 },
439 {
440 .flags = ASN1_TFLG_OPTIONAL,
441 .tag = 0,
442 .offset = offsetof(X9_62_CURVE, seed),
443 .field_name = "seed",
444 .item = &ASN1_BIT_STRING_it,
445 },
446 };
447
448 const ASN1_ITEM X9_62_CURVE_it = {
449 .itype = ASN1_ITYPE_SEQUENCE,
450 .utype = V_ASN1_SEQUENCE,
451 .templates = X9_62_CURVE_seq_tt,
452 .tcount = sizeof(X9_62_CURVE_seq_tt) / sizeof(ASN1_TEMPLATE),
453 .funcs = NULL,
454 .size = sizeof(X9_62_CURVE),
455 .sname = "X9_62_CURVE",
456 };
457
458 static const ASN1_TEMPLATE ECPARAMETERS_seq_tt[] = {
459 {
460 .flags = 0,
461 .tag = 0,
462 .offset = offsetof(ECPARAMETERS, version),
463 .field_name = "version",
464 .item = &LONG_it,
465 },
466 {
467 .flags = 0,
468 .tag = 0,
469 .offset = offsetof(ECPARAMETERS, fieldID),
470 .field_name = "fieldID",
471 .item = &X9_62_FIELDID_it,
472 },
473 {
474 .flags = 0,
475 .tag = 0,
476 .offset = offsetof(ECPARAMETERS, curve),
477 .field_name = "curve",
478 .item = &X9_62_CURVE_it,
479 },
480 {
481 .flags = 0,
482 .tag = 0,
483 .offset = offsetof(ECPARAMETERS, base),
484 .field_name = "base",
485 .item = &ASN1_OCTET_STRING_it,
486 },
487 {
488 .flags = 0,
489 .tag = 0,
490 .offset = offsetof(ECPARAMETERS, order),
491 .field_name = "order",
492 .item = &ASN1_INTEGER_it,
493 },
494 {
495 .flags = ASN1_TFLG_OPTIONAL,
496 .tag = 0,
497 .offset = offsetof(ECPARAMETERS, cofactor),
498 .field_name = "cofactor",
499 .item = &ASN1_INTEGER_it,
500 },
501 };
502
503 const ASN1_ITEM ECPARAMETERS_it = {
504 .itype = ASN1_ITYPE_SEQUENCE,
505 .utype = V_ASN1_SEQUENCE,
506 .templates = ECPARAMETERS_seq_tt,
507 .tcount = sizeof(ECPARAMETERS_seq_tt) / sizeof(ASN1_TEMPLATE),
508 .funcs = NULL,
509 .size = sizeof(ECPARAMETERS),
510 .sname = "ECPARAMETERS",
511 };
512
513 ECPARAMETERS *ECPARAMETERS_new(void);
514 void ECPARAMETERS_free(ECPARAMETERS *a);
515
516 ECPARAMETERS *
ECPARAMETERS_new(void)517 ECPARAMETERS_new(void)
518 {
519 return (ECPARAMETERS*)ASN1_item_new(&ECPARAMETERS_it);
520 }
521
522 void
ECPARAMETERS_free(ECPARAMETERS * a)523 ECPARAMETERS_free(ECPARAMETERS *a)
524 {
525 ASN1_item_free((ASN1_VALUE *)a, &ECPARAMETERS_it);
526 }
527
528 static const ASN1_TEMPLATE ECPKPARAMETERS_ch_tt[] = {
529 {
530 .flags = 0,
531 .tag = 0,
532 .offset = offsetof(ECPKPARAMETERS, value.named_curve),
533 .field_name = "value.named_curve",
534 .item = &ASN1_OBJECT_it,
535 },
536 {
537 .flags = 0,
538 .tag = 0,
539 .offset = offsetof(ECPKPARAMETERS, value.parameters),
540 .field_name = "value.parameters",
541 .item = &ECPARAMETERS_it,
542 },
543 {
544 .flags = 0,
545 .tag = 0,
546 .offset = offsetof(ECPKPARAMETERS, value.implicitlyCA),
547 .field_name = "value.implicitlyCA",
548 .item = &ASN1_NULL_it,
549 },
550 };
551
552 const ASN1_ITEM ECPKPARAMETERS_it = {
553 .itype = ASN1_ITYPE_CHOICE,
554 .utype = offsetof(ECPKPARAMETERS, type),
555 .templates = ECPKPARAMETERS_ch_tt,
556 .tcount = sizeof(ECPKPARAMETERS_ch_tt) / sizeof(ASN1_TEMPLATE),
557 .funcs = NULL,
558 .size = sizeof(ECPKPARAMETERS),
559 .sname = "ECPKPARAMETERS",
560 };
561
562 ECPKPARAMETERS *ECPKPARAMETERS_new(void);
563 void ECPKPARAMETERS_free(ECPKPARAMETERS *a);
564 ECPKPARAMETERS *d2i_ECPKPARAMETERS(ECPKPARAMETERS **a, const unsigned char **in, long len);
565 int i2d_ECPKPARAMETERS(const ECPKPARAMETERS *a, unsigned char **out);
566
567 ECPKPARAMETERS *
d2i_ECPKPARAMETERS(ECPKPARAMETERS ** a,const unsigned char ** in,long len)568 d2i_ECPKPARAMETERS(ECPKPARAMETERS **a, const unsigned char **in, long len)
569 {
570 return (ECPKPARAMETERS *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
571 &ECPKPARAMETERS_it);
572 }
573
574 int
i2d_ECPKPARAMETERS(const ECPKPARAMETERS * a,unsigned char ** out)575 i2d_ECPKPARAMETERS(const ECPKPARAMETERS *a, unsigned char **out)
576 {
577 return ASN1_item_i2d((ASN1_VALUE *)a, out, &ECPKPARAMETERS_it);
578 }
579
580 ECPKPARAMETERS *
ECPKPARAMETERS_new(void)581 ECPKPARAMETERS_new(void)
582 {
583 return (ECPKPARAMETERS *)ASN1_item_new(&ECPKPARAMETERS_it);
584 }
585
586 void
ECPKPARAMETERS_free(ECPKPARAMETERS * a)587 ECPKPARAMETERS_free(ECPKPARAMETERS *a)
588 {
589 ASN1_item_free((ASN1_VALUE *)a, &ECPKPARAMETERS_it);
590 }
591
592 static const ASN1_TEMPLATE EC_PRIVATEKEY_seq_tt[] = {
593 {
594 .flags = 0,
595 .tag = 0,
596 .offset = offsetof(EC_PRIVATEKEY, version),
597 .field_name = "version",
598 .item = &LONG_it,
599 },
600 {
601 .flags = 0,
602 .tag = 0,
603 .offset = offsetof(EC_PRIVATEKEY, privateKey),
604 .field_name = "privateKey",
605 .item = &ASN1_OCTET_STRING_it,
606 },
607 {
608 .flags = ASN1_TFLG_EXPLICIT | ASN1_TFLG_OPTIONAL,
609 .tag = 0,
610 .offset = offsetof(EC_PRIVATEKEY, parameters),
611 .field_name = "parameters",
612 .item = &ECPKPARAMETERS_it,
613 },
614 {
615 .flags = ASN1_TFLG_EXPLICIT | ASN1_TFLG_OPTIONAL,
616 .tag = 1,
617 .offset = offsetof(EC_PRIVATEKEY, publicKey),
618 .field_name = "publicKey",
619 .item = &ASN1_BIT_STRING_it,
620 },
621 };
622
623 const ASN1_ITEM EC_PRIVATEKEY_it = {
624 .itype = ASN1_ITYPE_SEQUENCE,
625 .utype = V_ASN1_SEQUENCE,
626 .templates = EC_PRIVATEKEY_seq_tt,
627 .tcount = sizeof(EC_PRIVATEKEY_seq_tt) / sizeof(ASN1_TEMPLATE),
628 .funcs = NULL,
629 .size = sizeof(EC_PRIVATEKEY),
630 .sname = "EC_PRIVATEKEY",
631 };
632
633 EC_PRIVATEKEY *EC_PRIVATEKEY_new(void);
634 void EC_PRIVATEKEY_free(EC_PRIVATEKEY *a);
635 EC_PRIVATEKEY *d2i_EC_PRIVATEKEY(EC_PRIVATEKEY **a, const unsigned char **in, long len);
636 int i2d_EC_PRIVATEKEY(const EC_PRIVATEKEY *a, unsigned char **out);
637
638 EC_PRIVATEKEY *
d2i_EC_PRIVATEKEY(EC_PRIVATEKEY ** a,const unsigned char ** in,long len)639 d2i_EC_PRIVATEKEY(EC_PRIVATEKEY **a, const unsigned char **in, long len)
640 {
641 return (EC_PRIVATEKEY *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
642 &EC_PRIVATEKEY_it);
643 }
644
645 int
i2d_EC_PRIVATEKEY(const EC_PRIVATEKEY * a,unsigned char ** out)646 i2d_EC_PRIVATEKEY(const EC_PRIVATEKEY *a, unsigned char **out)
647 {
648 return ASN1_item_i2d((ASN1_VALUE *)a, out, &EC_PRIVATEKEY_it);
649 }
650
651 EC_PRIVATEKEY *
EC_PRIVATEKEY_new(void)652 EC_PRIVATEKEY_new(void)
653 {
654 return (EC_PRIVATEKEY *)ASN1_item_new(&EC_PRIVATEKEY_it);
655 }
656
657 void
EC_PRIVATEKEY_free(EC_PRIVATEKEY * a)658 EC_PRIVATEKEY_free(EC_PRIVATEKEY *a)
659 {
660 ASN1_item_free((ASN1_VALUE *)a, &EC_PRIVATEKEY_it);
661 }
662
663 /* some declarations of internal function */
664
665 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
666 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
667 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
668 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
669 /* ec_asn1_parameters2group() creates a EC_GROUP object from a
670 * ECPARAMETERS object */
671 static EC_GROUP *ec_asn1_parameters2group(const ECPARAMETERS *);
672 /* ec_asn1_group2parameters() creates a ECPARAMETERS object from a
673 * EC_GROUP object */
674 static ECPARAMETERS *ec_asn1_group2parameters(const EC_GROUP *, ECPARAMETERS *);
675 /* ec_asn1_pkparameters2group() creates a EC_GROUP object from a
676 * ECPKPARAMETERS object */
677 static EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *);
678 /* ec_asn1_group2pkparameters() creates a ECPKPARAMETERS object from a
679 * EC_GROUP object */
680 static ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *,
681 ECPKPARAMETERS *);
682
683 /* the function definitions */
684
685 static int
ec_asn1_group2fieldid(const EC_GROUP * group,X9_62_FIELDID * field)686 ec_asn1_group2fieldid(const EC_GROUP * group, X9_62_FIELDID * field)
687 {
688 int ok = 0, nid;
689 BIGNUM *tmp = NULL;
690
691 if (group == NULL || field == NULL)
692 return 0;
693
694 /* clear the old values (if necessary) */
695 if (field->fieldType != NULL)
696 ASN1_OBJECT_free(field->fieldType);
697 if (field->p.other != NULL)
698 ASN1_TYPE_free(field->p.other);
699
700 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
701 /* set OID for the field */
702 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
703 ECerror(ERR_R_OBJ_LIB);
704 goto err;
705 }
706 if (nid == NID_X9_62_prime_field) {
707 if ((tmp = BN_new()) == NULL) {
708 ECerror(ERR_R_MALLOC_FAILURE);
709 goto err;
710 }
711 /* the parameters are specified by the prime number p */
712 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
713 ECerror(ERR_R_EC_LIB);
714 goto err;
715 }
716 /* set the prime number */
717 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
718 if (field->p.prime == NULL) {
719 ECerror(ERR_R_ASN1_LIB);
720 goto err;
721 }
722 } else /* nid == NID_X9_62_characteristic_two_field */
723 #ifdef OPENSSL_NO_EC2M
724 {
725 ECerror(EC_R_GF2M_NOT_SUPPORTED);
726 goto err;
727 }
728 #else
729 {
730 int field_type;
731 X9_62_CHARACTERISTIC_TWO *char_two;
732
733 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
734 char_two = field->p.char_two;
735
736 if (char_two == NULL) {
737 ECerror(ERR_R_MALLOC_FAILURE);
738 goto err;
739 }
740 char_two->m = (long) EC_GROUP_get_degree(group);
741
742 field_type = EC_GROUP_get_basis_type(group);
743
744 if (field_type == 0) {
745 ECerror(ERR_R_EC_LIB);
746 goto err;
747 }
748 /* set base type OID */
749 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
750 ECerror(ERR_R_OBJ_LIB);
751 goto err;
752 }
753 if (field_type == NID_X9_62_tpBasis) {
754 unsigned int k;
755
756 if (!EC_GROUP_get_trinomial_basis(group, &k))
757 goto err;
758
759 char_two->p.tpBasis = ASN1_INTEGER_new();
760 if (!char_two->p.tpBasis) {
761 ECerror(ERR_R_MALLOC_FAILURE);
762 goto err;
763 }
764 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long) k)) {
765 ECerror(ERR_R_ASN1_LIB);
766 goto err;
767 }
768 } else if (field_type == NID_X9_62_ppBasis) {
769 unsigned int k1, k2, k3;
770
771 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
772 goto err;
773
774 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
775 if (!char_two->p.ppBasis) {
776 ECerror(ERR_R_MALLOC_FAILURE);
777 goto err;
778 }
779 /* set k? values */
780 char_two->p.ppBasis->k1 = (long) k1;
781 char_two->p.ppBasis->k2 = (long) k2;
782 char_two->p.ppBasis->k3 = (long) k3;
783 } else { /* field_type == NID_X9_62_onBasis */
784 /* for ONB the parameters are (asn1) NULL */
785 char_two->p.onBasis = ASN1_NULL_new();
786 if (!char_two->p.onBasis) {
787 ECerror(ERR_R_MALLOC_FAILURE);
788 goto err;
789 }
790 }
791 }
792 #endif
793
794 ok = 1;
795
796 err:
797 BN_free(tmp);
798 return (ok);
799 }
800
801 static int
ec_asn1_group2curve(const EC_GROUP * group,X9_62_CURVE * curve)802 ec_asn1_group2curve(const EC_GROUP * group, X9_62_CURVE * curve)
803 {
804 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
805 unsigned char *buffer_1 = NULL, *buffer_2 = NULL, *a_buf = NULL,
806 *b_buf = NULL;
807 size_t len_1, len_2;
808 unsigned char char_zero = 0;
809 int ok = 0;
810
811 if (!group || !curve || !curve->a || !curve->b)
812 return 0;
813
814 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
815 ECerror(ERR_R_MALLOC_FAILURE);
816 goto err;
817 }
818
819 /* get a and b */
820 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
821 ECerror(ERR_R_EC_LIB);
822 goto err;
823 }
824 len_1 = (size_t) BN_num_bytes(tmp_1);
825 len_2 = (size_t) BN_num_bytes(tmp_2);
826
827 if (len_1 == 0) {
828 /* len_1 == 0 => a == 0 */
829 a_buf = &char_zero;
830 len_1 = 1;
831 } else {
832 if ((buffer_1 = malloc(len_1)) == NULL) {
833 ECerror(ERR_R_MALLOC_FAILURE);
834 goto err;
835 }
836 if ((len_1 = BN_bn2bin(tmp_1, buffer_1)) == 0) {
837 ECerror(ERR_R_BN_LIB);
838 goto err;
839 }
840 a_buf = buffer_1;
841 }
842
843 if (len_2 == 0) {
844 /* len_2 == 0 => b == 0 */
845 b_buf = &char_zero;
846 len_2 = 1;
847 } else {
848 if ((buffer_2 = malloc(len_2)) == NULL) {
849 ECerror(ERR_R_MALLOC_FAILURE);
850 goto err;
851 }
852 if ((len_2 = BN_bn2bin(tmp_2, buffer_2)) == 0) {
853 ECerror(ERR_R_BN_LIB);
854 goto err;
855 }
856 b_buf = buffer_2;
857 }
858
859 /* set a and b */
860 if (!ASN1_STRING_set(curve->a, a_buf, len_1) ||
861 !ASN1_STRING_set(curve->b, b_buf, len_2)) {
862 ECerror(ERR_R_ASN1_LIB);
863 goto err;
864 }
865
866 ASN1_BIT_STRING_free(curve->seed);
867 curve->seed = NULL;
868
869 /* set the seed (optional) */
870 if (group->seed != NULL) {
871 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
872 ECerror(ERR_R_MALLOC_FAILURE);
873 goto err;
874 }
875 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
876 (int) group->seed_len)) {
877 ECerror(ERR_R_ASN1_LIB);
878 goto err;
879 }
880 if (!asn1_abs_set_unused_bits(curve->seed, 0)) {
881 ECerror(ERR_R_ASN1_LIB);
882 goto err;
883 }
884 }
885
886 ok = 1;
887
888 err:
889 free(buffer_1);
890 free(buffer_2);
891 BN_free(tmp_1);
892 BN_free(tmp_2);
893 return (ok);
894 }
895
896 static ECPARAMETERS *
ec_asn1_group2parameters(const EC_GROUP * group,ECPARAMETERS * param)897 ec_asn1_group2parameters(const EC_GROUP * group, ECPARAMETERS * param)
898 {
899 int ok = 0;
900 size_t len = 0;
901 ECPARAMETERS *ret = NULL;
902 BIGNUM *tmp = NULL;
903 unsigned char *buffer = NULL;
904 const EC_POINT *point = NULL;
905 point_conversion_form_t form;
906
907 if ((tmp = BN_new()) == NULL) {
908 ECerror(ERR_R_MALLOC_FAILURE);
909 goto err;
910 }
911 if (param == NULL) {
912 if ((ret = ECPARAMETERS_new()) == NULL) {
913 ECerror(ERR_R_MALLOC_FAILURE);
914 goto err;
915 }
916 } else
917 ret = param;
918
919 /* set the version (always one) */
920 ret->version = (long) 0x1;
921
922 /* set the fieldID */
923 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
924 ECerror(ERR_R_EC_LIB);
925 goto err;
926 }
927 /* set the curve */
928 if (!ec_asn1_group2curve(group, ret->curve)) {
929 ECerror(ERR_R_EC_LIB);
930 goto err;
931 }
932 /* set the base point */
933 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
934 ECerror(EC_R_UNDEFINED_GENERATOR);
935 goto err;
936 }
937 form = EC_GROUP_get_point_conversion_form(group);
938
939 len = EC_POINT_point2oct(group, point, form, NULL, len, NULL);
940 if (len == 0) {
941 ECerror(ERR_R_EC_LIB);
942 goto err;
943 }
944 if ((buffer = malloc(len)) == NULL) {
945 ECerror(ERR_R_MALLOC_FAILURE);
946 goto err;
947 }
948 if (!EC_POINT_point2oct(group, point, form, buffer, len, NULL)) {
949 ECerror(ERR_R_EC_LIB);
950 goto err;
951 }
952 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
953 ECerror(ERR_R_MALLOC_FAILURE);
954 goto err;
955 }
956 if (!ASN1_OCTET_STRING_set(ret->base, buffer, len)) {
957 ECerror(ERR_R_ASN1_LIB);
958 goto err;
959 }
960 /* set the order */
961 if (!EC_GROUP_get_order(group, tmp, NULL)) {
962 ECerror(ERR_R_EC_LIB);
963 goto err;
964 }
965 ret->order = BN_to_ASN1_INTEGER(tmp, ret->order);
966 if (ret->order == NULL) {
967 ECerror(ERR_R_ASN1_LIB);
968 goto err;
969 }
970 /* set the cofactor (optional) */
971 if (EC_GROUP_get_cofactor(group, tmp, NULL)) {
972 ret->cofactor = BN_to_ASN1_INTEGER(tmp, ret->cofactor);
973 if (ret->cofactor == NULL) {
974 ECerror(ERR_R_ASN1_LIB);
975 goto err;
976 }
977 }
978 ok = 1;
979
980 err:
981 if (!ok) {
982 if (ret && !param)
983 ECPARAMETERS_free(ret);
984 ret = NULL;
985 }
986 BN_free(tmp);
987 free(buffer);
988 return (ret);
989 }
990
991 ECPKPARAMETERS *
ec_asn1_group2pkparameters(const EC_GROUP * group,ECPKPARAMETERS * params)992 ec_asn1_group2pkparameters(const EC_GROUP * group, ECPKPARAMETERS * params)
993 {
994 int ok = 1, tmp;
995 ECPKPARAMETERS *ret = params;
996
997 if (ret == NULL) {
998 if ((ret = ECPKPARAMETERS_new()) == NULL) {
999 ECerror(ERR_R_MALLOC_FAILURE);
1000 return NULL;
1001 }
1002 } else {
1003 if (ret->type == 0 && ret->value.named_curve)
1004 ASN1_OBJECT_free(ret->value.named_curve);
1005 else if (ret->type == 1 && ret->value.parameters)
1006 ECPARAMETERS_free(ret->value.parameters);
1007 }
1008
1009 if (EC_GROUP_get_asn1_flag(group)) {
1010 /*
1011 * use the asn1 OID to describe the elliptic curve
1012 * parameters
1013 */
1014 tmp = EC_GROUP_get_curve_name(group);
1015 if (tmp) {
1016 ret->type = 0;
1017 if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL)
1018 ok = 0;
1019 } else
1020 /* we don't know the group => ERROR */
1021 ok = 0;
1022 } else {
1023 /* use the ECPARAMETERS structure */
1024 ret->type = 1;
1025 if ((ret->value.parameters = ec_asn1_group2parameters(
1026 group, NULL)) == NULL)
1027 ok = 0;
1028 }
1029
1030 if (!ok) {
1031 ECPKPARAMETERS_free(ret);
1032 return NULL;
1033 }
1034 return ret;
1035 }
1036
1037 static EC_GROUP *
ec_asn1_parameters2group(const ECPARAMETERS * params)1038 ec_asn1_parameters2group(const ECPARAMETERS * params)
1039 {
1040 int ok = 0, tmp;
1041 EC_GROUP *ret = NULL;
1042 BIGNUM *p = NULL, *a = NULL, *b = NULL;
1043 EC_POINT *point = NULL;
1044 long field_bits;
1045
1046 if (!params->fieldID || !params->fieldID->fieldType ||
1047 !params->fieldID->p.ptr) {
1048 ECerror(EC_R_ASN1_ERROR);
1049 goto err;
1050 }
1051 /* now extract the curve parameters a and b */
1052 if (!params->curve || !params->curve->a ||
1053 !params->curve->a->data || !params->curve->b ||
1054 !params->curve->b->data) {
1055 ECerror(EC_R_ASN1_ERROR);
1056 goto err;
1057 }
1058 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
1059 if (a == NULL) {
1060 ECerror(ERR_R_BN_LIB);
1061 goto err;
1062 }
1063 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
1064 if (b == NULL) {
1065 ECerror(ERR_R_BN_LIB);
1066 goto err;
1067 }
1068 /* get the field parameters */
1069 tmp = OBJ_obj2nid(params->fieldID->fieldType);
1070 if (tmp == NID_X9_62_characteristic_two_field)
1071 #ifdef OPENSSL_NO_EC2M
1072 {
1073 ECerror(EC_R_GF2M_NOT_SUPPORTED);
1074 goto err;
1075 }
1076 #else
1077 {
1078 X9_62_CHARACTERISTIC_TWO *char_two;
1079
1080 char_two = params->fieldID->p.char_two;
1081
1082 field_bits = char_two->m;
1083 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
1084 ECerror(EC_R_FIELD_TOO_LARGE);
1085 goto err;
1086 }
1087 if ((p = BN_new()) == NULL) {
1088 ECerror(ERR_R_MALLOC_FAILURE);
1089 goto err;
1090 }
1091 /* get the base type */
1092 tmp = OBJ_obj2nid(char_two->type);
1093
1094 if (tmp == NID_X9_62_tpBasis) {
1095 long tmp_long;
1096
1097 if (!char_two->p.tpBasis) {
1098 ECerror(EC_R_ASN1_ERROR);
1099 goto err;
1100 }
1101 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
1102
1103 if (!(char_two->m > tmp_long && tmp_long > 0)) {
1104 ECerror(EC_R_INVALID_TRINOMIAL_BASIS);
1105 goto err;
1106 }
1107 /* create the polynomial */
1108 if (!BN_set_bit(p, (int) char_two->m))
1109 goto err;
1110 if (!BN_set_bit(p, (int) tmp_long))
1111 goto err;
1112 if (!BN_set_bit(p, 0))
1113 goto err;
1114 } else if (tmp == NID_X9_62_ppBasis) {
1115 X9_62_PENTANOMIAL *penta;
1116
1117 penta = char_two->p.ppBasis;
1118 if (!penta) {
1119 ECerror(EC_R_ASN1_ERROR);
1120 goto err;
1121 }
1122 if (!(char_two->m > penta->k3 && penta->k3 > penta->k2 && penta->k2 > penta->k1 && penta->k1 > 0)) {
1123 ECerror(EC_R_INVALID_PENTANOMIAL_BASIS);
1124 goto err;
1125 }
1126 /* create the polynomial */
1127 if (!BN_set_bit(p, (int) char_two->m))
1128 goto err;
1129 if (!BN_set_bit(p, (int) penta->k1))
1130 goto err;
1131 if (!BN_set_bit(p, (int) penta->k2))
1132 goto err;
1133 if (!BN_set_bit(p, (int) penta->k3))
1134 goto err;
1135 if (!BN_set_bit(p, 0))
1136 goto err;
1137 } else if (tmp == NID_X9_62_onBasis) {
1138 ECerror(EC_R_NOT_IMPLEMENTED);
1139 goto err;
1140 } else { /* error */
1141 ECerror(EC_R_ASN1_ERROR);
1142 goto err;
1143 }
1144
1145 /* create the EC_GROUP structure */
1146 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
1147 }
1148 #endif
1149 else if (tmp == NID_X9_62_prime_field) {
1150 /* we have a curve over a prime field */
1151 /* extract the prime number */
1152 if (!params->fieldID->p.prime) {
1153 ECerror(EC_R_ASN1_ERROR);
1154 goto err;
1155 }
1156 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
1157 if (p == NULL) {
1158 ECerror(ERR_R_ASN1_LIB);
1159 goto err;
1160 }
1161 if (BN_is_negative(p) || BN_is_zero(p)) {
1162 ECerror(EC_R_INVALID_FIELD);
1163 goto err;
1164 }
1165 field_bits = BN_num_bits(p);
1166 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
1167 ECerror(EC_R_FIELD_TOO_LARGE);
1168 goto err;
1169 }
1170 /* create the EC_GROUP structure */
1171 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
1172 } else {
1173 ECerror(EC_R_INVALID_FIELD);
1174 goto err;
1175 }
1176
1177 if (ret == NULL) {
1178 ECerror(ERR_R_EC_LIB);
1179 goto err;
1180 }
1181 /* extract seed (optional) */
1182 if (params->curve->seed != NULL) {
1183 free(ret->seed);
1184 if (!(ret->seed = malloc(params->curve->seed->length))) {
1185 ECerror(ERR_R_MALLOC_FAILURE);
1186 goto err;
1187 }
1188 memcpy(ret->seed, params->curve->seed->data,
1189 params->curve->seed->length);
1190 ret->seed_len = params->curve->seed->length;
1191 }
1192 if (!params->order || !params->base || !params->base->data) {
1193 ECerror(EC_R_ASN1_ERROR);
1194 goto err;
1195 }
1196 if ((point = EC_POINT_new(ret)) == NULL)
1197 goto err;
1198
1199 /* set the point conversion form */
1200 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
1201 (params->base->data[0] & ~0x01));
1202
1203 /* extract the ec point */
1204 if (!EC_POINT_oct2point(ret, point, params->base->data,
1205 params->base->length, NULL)) {
1206 ECerror(ERR_R_EC_LIB);
1207 goto err;
1208 }
1209 /* extract the order */
1210 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
1211 ECerror(ERR_R_ASN1_LIB);
1212 goto err;
1213 }
1214 if (BN_is_negative(a) || BN_is_zero(a)) {
1215 ECerror(EC_R_INVALID_GROUP_ORDER);
1216 goto err;
1217 }
1218 if (BN_num_bits(a) > (int) field_bits + 1) { /* Hasse bound */
1219 ECerror(EC_R_INVALID_GROUP_ORDER);
1220 goto err;
1221 }
1222 /* extract the cofactor (optional) */
1223 if (params->cofactor == NULL) {
1224 BN_free(b);
1225 b = NULL;
1226 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
1227 ECerror(ERR_R_ASN1_LIB);
1228 goto err;
1229 }
1230 /* set the generator, order and cofactor (if present) */
1231 if (!EC_GROUP_set_generator(ret, point, a, b)) {
1232 ECerror(ERR_R_EC_LIB);
1233 goto err;
1234 }
1235 ok = 1;
1236
1237 err:
1238 if (!ok) {
1239 EC_GROUP_clear_free(ret);
1240 ret = NULL;
1241 }
1242 BN_free(p);
1243 BN_free(a);
1244 BN_free(b);
1245 EC_POINT_free(point);
1246 return (ret);
1247 }
1248
1249 EC_GROUP *
ec_asn1_pkparameters2group(const ECPKPARAMETERS * params)1250 ec_asn1_pkparameters2group(const ECPKPARAMETERS * params)
1251 {
1252 EC_GROUP *ret = NULL;
1253 int tmp = 0;
1254
1255 if (params == NULL) {
1256 ECerror(EC_R_MISSING_PARAMETERS);
1257 return NULL;
1258 }
1259 if (params->type == 0) {/* the curve is given by an OID */
1260 tmp = OBJ_obj2nid(params->value.named_curve);
1261 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
1262 ECerror(EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
1263 return NULL;
1264 }
1265 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
1266 } else if (params->type == 1) { /* the parameters are given by a
1267 * ECPARAMETERS structure */
1268 ret = ec_asn1_parameters2group(params->value.parameters);
1269 if (!ret) {
1270 ECerror(ERR_R_EC_LIB);
1271 return NULL;
1272 }
1273 EC_GROUP_set_asn1_flag(ret, 0x0);
1274 } else if (params->type == 2) { /* implicitlyCA */
1275 return NULL;
1276 } else {
1277 ECerror(EC_R_ASN1_ERROR);
1278 return NULL;
1279 }
1280
1281 return ret;
1282 }
1283
1284 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
1285
1286 EC_GROUP *
d2i_ECPKParameters(EC_GROUP ** a,const unsigned char ** in,long len)1287 d2i_ECPKParameters(EC_GROUP ** a, const unsigned char **in, long len)
1288 {
1289 EC_GROUP *group = NULL;
1290 ECPKPARAMETERS *params;
1291
1292 if ((params = d2i_ECPKPARAMETERS(NULL, in, len)) == NULL) {
1293 ECerror(EC_R_D2I_ECPKPARAMETERS_FAILURE);
1294 goto err;
1295 }
1296 if ((group = ec_asn1_pkparameters2group(params)) == NULL) {
1297 ECerror(EC_R_PKPARAMETERS2GROUP_FAILURE);
1298 goto err;
1299 }
1300
1301 if (a != NULL) {
1302 EC_GROUP_clear_free(*a);
1303 *a = group;
1304 }
1305
1306 err:
1307 ECPKPARAMETERS_free(params);
1308 return (group);
1309 }
1310
1311 int
i2d_ECPKParameters(const EC_GROUP * a,unsigned char ** out)1312 i2d_ECPKParameters(const EC_GROUP * a, unsigned char **out)
1313 {
1314 int ret = 0;
1315 ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(a, NULL);
1316 if (tmp == NULL) {
1317 ECerror(EC_R_GROUP2PKPARAMETERS_FAILURE);
1318 return 0;
1319 }
1320 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
1321 ECerror(EC_R_I2D_ECPKPARAMETERS_FAILURE);
1322 ECPKPARAMETERS_free(tmp);
1323 return 0;
1324 }
1325 ECPKPARAMETERS_free(tmp);
1326 return (ret);
1327 }
1328
1329 /* some EC_KEY functions */
1330
1331 EC_KEY *
d2i_ECPrivateKey(EC_KEY ** a,const unsigned char ** in,long len)1332 d2i_ECPrivateKey(EC_KEY ** a, const unsigned char **in, long len)
1333 {
1334 EC_KEY *ret = NULL;
1335 EC_PRIVATEKEY *priv_key = NULL;
1336
1337 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, in, len)) == NULL) {
1338 ECerror(ERR_R_EC_LIB);
1339 return NULL;
1340 }
1341 if (a == NULL || *a == NULL) {
1342 if ((ret = EC_KEY_new()) == NULL) {
1343 ECerror(ERR_R_MALLOC_FAILURE);
1344 goto err;
1345 }
1346 } else
1347 ret = *a;
1348
1349 if (priv_key->parameters) {
1350 EC_GROUP_clear_free(ret->group);
1351 ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
1352 }
1353 if (ret->group == NULL) {
1354 ECerror(ERR_R_EC_LIB);
1355 goto err;
1356 }
1357 ret->version = priv_key->version;
1358
1359 if (priv_key->privateKey) {
1360 ret->priv_key = BN_bin2bn(
1361 ASN1_STRING_data(priv_key->privateKey),
1362 ASN1_STRING_length(priv_key->privateKey),
1363 ret->priv_key);
1364 if (ret->priv_key == NULL) {
1365 ECerror(ERR_R_BN_LIB);
1366 goto err;
1367 }
1368 } else {
1369 ECerror(EC_R_MISSING_PRIVATE_KEY);
1370 goto err;
1371 }
1372
1373 if (ret->pub_key)
1374 EC_POINT_clear_free(ret->pub_key);
1375 ret->pub_key = EC_POINT_new(ret->group);
1376 if (ret->pub_key == NULL) {
1377 ECerror(ERR_R_EC_LIB);
1378 goto err;
1379 }
1380
1381 if (priv_key->publicKey) {
1382 const unsigned char *pub_oct;
1383 size_t pub_oct_len;
1384
1385 pub_oct = ASN1_STRING_data(priv_key->publicKey);
1386 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1387 if (pub_oct == NULL || pub_oct_len <= 0) {
1388 ECerror(EC_R_BUFFER_TOO_SMALL);
1389 goto err;
1390 }
1391
1392 /* save the point conversion form */
1393 ret->conv_form = (point_conversion_form_t) (pub_oct[0] & ~0x01);
1394 if (!EC_POINT_oct2point(ret->group, ret->pub_key,
1395 pub_oct, pub_oct_len, NULL)) {
1396 ECerror(ERR_R_EC_LIB);
1397 goto err;
1398 }
1399 } else {
1400 if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key,
1401 NULL, NULL, NULL)) {
1402 ECerror(ERR_R_EC_LIB);
1403 goto err;
1404 }
1405 /* Remember the original private-key-only encoding. */
1406 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1407 }
1408
1409 EC_PRIVATEKEY_free(priv_key);
1410 if (a != NULL)
1411 *a = ret;
1412 return (ret);
1413
1414 err:
1415 if (a == NULL || *a != ret)
1416 EC_KEY_free(ret);
1417 if (priv_key)
1418 EC_PRIVATEKEY_free(priv_key);
1419
1420 return (NULL);
1421 }
1422
1423 int
i2d_ECPrivateKey(EC_KEY * a,unsigned char ** out)1424 i2d_ECPrivateKey(EC_KEY * a, unsigned char **out)
1425 {
1426 int ret = 0, ok = 0;
1427 unsigned char *buffer = NULL;
1428 size_t buf_len = 0, tmp_len;
1429 EC_PRIVATEKEY *priv_key = NULL;
1430
1431 if (a == NULL || a->group == NULL || a->priv_key == NULL ||
1432 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1433 ECerror(ERR_R_PASSED_NULL_PARAMETER);
1434 goto err;
1435 }
1436 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1437 ECerror(ERR_R_MALLOC_FAILURE);
1438 goto err;
1439 }
1440 priv_key->version = a->version;
1441
1442 buf_len = (size_t) BN_num_bytes(a->priv_key);
1443 buffer = malloc(buf_len);
1444 if (buffer == NULL) {
1445 ECerror(ERR_R_MALLOC_FAILURE);
1446 goto err;
1447 }
1448 if (!BN_bn2bin(a->priv_key, buffer)) {
1449 ECerror(ERR_R_BN_LIB);
1450 goto err;
1451 }
1452 if (!ASN1_STRING_set(priv_key->privateKey, buffer, buf_len)) {
1453 ECerror(ERR_R_ASN1_LIB);
1454 goto err;
1455 }
1456 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1457 if ((priv_key->parameters = ec_asn1_group2pkparameters(
1458 a->group, priv_key->parameters)) == NULL) {
1459 ECerror(ERR_R_EC_LIB);
1460 goto err;
1461 }
1462 }
1463 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key != NULL) {
1464 priv_key->publicKey = ASN1_BIT_STRING_new();
1465 if (priv_key->publicKey == NULL) {
1466 ECerror(ERR_R_MALLOC_FAILURE);
1467 goto err;
1468 }
1469 tmp_len = EC_POINT_point2oct(a->group, a->pub_key,
1470 a->conv_form, NULL, 0, NULL);
1471
1472 if (tmp_len > buf_len) {
1473 unsigned char *tmp_buffer = realloc(buffer, tmp_len);
1474 if (!tmp_buffer) {
1475 ECerror(ERR_R_MALLOC_FAILURE);
1476 goto err;
1477 }
1478 buffer = tmp_buffer;
1479 buf_len = tmp_len;
1480 }
1481 if (!EC_POINT_point2oct(a->group, a->pub_key,
1482 a->conv_form, buffer, buf_len, NULL)) {
1483 ECerror(ERR_R_EC_LIB);
1484 goto err;
1485 }
1486 if (!ASN1_STRING_set(priv_key->publicKey, buffer, buf_len)) {
1487 ECerror(ERR_R_ASN1_LIB);
1488 goto err;
1489 }
1490 if (!asn1_abs_set_unused_bits(priv_key->publicKey, 0)) {
1491 ECerror(ERR_R_ASN1_LIB);
1492 goto err;
1493 }
1494 }
1495 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1496 ECerror(ERR_R_EC_LIB);
1497 goto err;
1498 }
1499 ok = 1;
1500 err:
1501 free(buffer);
1502 if (priv_key)
1503 EC_PRIVATEKEY_free(priv_key);
1504 return (ok ? ret : 0);
1505 }
1506
1507 int
i2d_ECParameters(EC_KEY * a,unsigned char ** out)1508 i2d_ECParameters(EC_KEY * a, unsigned char **out)
1509 {
1510 if (a == NULL) {
1511 ECerror(ERR_R_PASSED_NULL_PARAMETER);
1512 return 0;
1513 }
1514 return i2d_ECPKParameters(a->group, out);
1515 }
1516
1517 EC_KEY *
d2i_ECParameters(EC_KEY ** a,const unsigned char ** in,long len)1518 d2i_ECParameters(EC_KEY ** a, const unsigned char **in, long len)
1519 {
1520 EC_KEY *ret;
1521
1522 if (in == NULL || *in == NULL) {
1523 ECerror(ERR_R_PASSED_NULL_PARAMETER);
1524 return NULL;
1525 }
1526 if (a == NULL || *a == NULL) {
1527 if ((ret = EC_KEY_new()) == NULL) {
1528 ECerror(ERR_R_MALLOC_FAILURE);
1529 return NULL;
1530 }
1531 } else
1532 ret = *a;
1533
1534 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1535 ECerror(ERR_R_EC_LIB);
1536 if (a == NULL || *a != ret)
1537 EC_KEY_free(ret);
1538 return NULL;
1539 }
1540
1541 if (a != NULL)
1542 *a = ret;
1543 return ret;
1544 }
1545
1546 EC_KEY *
o2i_ECPublicKey(EC_KEY ** a,const unsigned char ** in,long len)1547 o2i_ECPublicKey(EC_KEY ** a, const unsigned char **in, long len)
1548 {
1549 EC_KEY *ret = NULL;
1550
1551 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1552 /* An EC_GROUP structure is necessary to set the public key. */
1553 ECerror(ERR_R_PASSED_NULL_PARAMETER);
1554 return 0;
1555 }
1556 ret = *a;
1557 if (ret->pub_key == NULL &&
1558 (ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
1559 ECerror(ERR_R_MALLOC_FAILURE);
1560 return 0;
1561 }
1562 if (!EC_POINT_oct2point(ret->group, ret->pub_key, *in, len, NULL)) {
1563 ECerror(ERR_R_EC_LIB);
1564 return 0;
1565 }
1566 /* save the point conversion form */
1567 ret->conv_form = (point_conversion_form_t) (*in[0] & ~0x01);
1568 *in += len;
1569 return ret;
1570 }
1571
1572 int
i2o_ECPublicKey(const EC_KEY * a,unsigned char ** out)1573 i2o_ECPublicKey(const EC_KEY * a, unsigned char **out)
1574 {
1575 size_t buf_len = 0;
1576 int new_buffer = 0;
1577
1578 if (a == NULL) {
1579 ECerror(ERR_R_PASSED_NULL_PARAMETER);
1580 return 0;
1581 }
1582 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1583 a->conv_form, NULL, 0, NULL);
1584
1585 if (out == NULL || buf_len == 0)
1586 /* out == NULL => just return the length of the octet string */
1587 return buf_len;
1588
1589 if (*out == NULL) {
1590 if ((*out = malloc(buf_len)) == NULL) {
1591 ECerror(ERR_R_MALLOC_FAILURE);
1592 return 0;
1593 }
1594 new_buffer = 1;
1595 }
1596 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1597 *out, buf_len, NULL)) {
1598 ECerror(ERR_R_EC_LIB);
1599 if (new_buffer) {
1600 free(*out);
1601 *out = NULL;
1602 }
1603 return 0;
1604 }
1605 if (!new_buffer)
1606 *out += buf_len;
1607 return buf_len;
1608 }
1609