1 /*
2 * Copyright 2002-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <string.h>
11 #include "ec_local.h"
12 #include <openssl/err.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
15 #include "internal/nelem.h"
16
EC_GROUP_get_basis_type(const EC_GROUP * group)17 int EC_GROUP_get_basis_type(const EC_GROUP *group)
18 {
19 int i;
20
21 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
22 NID_X9_62_characteristic_two_field)
23 /* everything else is currently not supported */
24 return 0;
25
26 /* Find the last non-zero element of group->poly[] */
27 for (i = 0;
28 i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0;
29 i++)
30 continue;
31
32 if (i == 4)
33 return NID_X9_62_ppBasis;
34 else if (i == 2)
35 return NID_X9_62_tpBasis;
36 else
37 /* everything else is currently not supported */
38 return 0;
39 }
40
41 #ifndef OPENSSL_NO_EC2M
EC_GROUP_get_trinomial_basis(const EC_GROUP * group,unsigned int * k)42 int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k)
43 {
44 if (group == NULL)
45 return 0;
46
47 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
48 NID_X9_62_characteristic_two_field
49 || !((group->poly[0] != 0) && (group->poly[1] != 0)
50 && (group->poly[2] == 0))) {
51 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS,
52 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
53 return 0;
54 }
55
56 if (k)
57 *k = group->poly[1];
58
59 return 1;
60 }
61
EC_GROUP_get_pentanomial_basis(const EC_GROUP * group,unsigned int * k1,unsigned int * k2,unsigned int * k3)62 int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1,
63 unsigned int *k2, unsigned int *k3)
64 {
65 if (group == NULL)
66 return 0;
67
68 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) !=
69 NID_X9_62_characteristic_two_field
70 || !((group->poly[0] != 0) && (group->poly[1] != 0)
71 && (group->poly[2] != 0) && (group->poly[3] != 0)
72 && (group->poly[4] == 0))) {
73 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS,
74 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
75 return 0;
76 }
77
78 if (k1)
79 *k1 = group->poly[3];
80 if (k2)
81 *k2 = group->poly[2];
82 if (k3)
83 *k3 = group->poly[1];
84
85 return 1;
86 }
87 #endif
88
89 /* some structures needed for the asn1 encoding */
90 typedef struct x9_62_pentanomial_st {
91 int32_t k1;
92 int32_t k2;
93 int32_t k3;
94 } X9_62_PENTANOMIAL;
95
96 typedef struct x9_62_characteristic_two_st {
97 int32_t m;
98 ASN1_OBJECT *type;
99 union {
100 char *ptr;
101 /* NID_X9_62_onBasis */
102 ASN1_NULL *onBasis;
103 /* NID_X9_62_tpBasis */
104 ASN1_INTEGER *tpBasis;
105 /* NID_X9_62_ppBasis */
106 X9_62_PENTANOMIAL *ppBasis;
107 /* anything else */
108 ASN1_TYPE *other;
109 } p;
110 } X9_62_CHARACTERISTIC_TWO;
111
112 typedef struct x9_62_fieldid_st {
113 ASN1_OBJECT *fieldType;
114 union {
115 char *ptr;
116 /* NID_X9_62_prime_field */
117 ASN1_INTEGER *prime;
118 /* NID_X9_62_characteristic_two_field */
119 X9_62_CHARACTERISTIC_TWO *char_two;
120 /* anything else */
121 ASN1_TYPE *other;
122 } p;
123 } X9_62_FIELDID;
124
125 typedef struct x9_62_curve_st {
126 ASN1_OCTET_STRING *a;
127 ASN1_OCTET_STRING *b;
128 ASN1_BIT_STRING *seed;
129 } X9_62_CURVE;
130
131 struct ec_parameters_st {
132 int32_t version;
133 X9_62_FIELDID *fieldID;
134 X9_62_CURVE *curve;
135 ASN1_OCTET_STRING *base;
136 ASN1_INTEGER *order;
137 ASN1_INTEGER *cofactor;
138 } /* ECPARAMETERS */ ;
139
140 typedef enum {
141 ECPKPARAMETERS_TYPE_NAMED = 0,
142 ECPKPARAMETERS_TYPE_EXPLICIT,
143 ECPKPARAMETERS_TYPE_IMPLICIT
144 } ecpk_parameters_type_t;
145
146 struct ecpk_parameters_st {
147 int type;
148 union {
149 ASN1_OBJECT *named_curve;
150 ECPARAMETERS *parameters;
151 ASN1_NULL *implicitlyCA;
152 } value;
153 } /* ECPKPARAMETERS */ ;
154
155 /* SEC1 ECPrivateKey */
156 typedef struct ec_privatekey_st {
157 int32_t version;
158 ASN1_OCTET_STRING *privateKey;
159 ECPKPARAMETERS *parameters;
160 ASN1_BIT_STRING *publicKey;
161 } EC_PRIVATEKEY;
162
163 /* the OpenSSL ASN.1 definitions */
164 ASN1_SEQUENCE(X9_62_PENTANOMIAL) = {
165 ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32),
166 ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32),
167 ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32)
168 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL)
169
170 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
171 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL)
172
173 ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY);
174
175 ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = {
176 ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)),
177 ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)),
178 ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL))
179 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL);
180
181 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = {
182 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32),
183 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT),
184 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO)
185 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO)
186
187 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
188 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO)
189
190 ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
191
192 ASN1_ADB(X9_62_FIELDID) = {
193 ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
194 ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO))
195 } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
196
197 ASN1_SEQUENCE(X9_62_FIELDID) = {
198 ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
199 ASN1_ADB_OBJECT(X9_62_FIELDID)
200 } static_ASN1_SEQUENCE_END(X9_62_FIELDID)
201
202 ASN1_SEQUENCE(X9_62_CURVE) = {
203 ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
204 ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
205 ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
206 } static_ASN1_SEQUENCE_END(X9_62_CURVE)
207
208 ASN1_SEQUENCE(ECPARAMETERS) = {
209 ASN1_EMBED(ECPARAMETERS, version, INT32),
210 ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
211 ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
212 ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
213 ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
214 ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
215 } ASN1_SEQUENCE_END(ECPARAMETERS)
216
217 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
218 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS)
219
220 ASN1_CHOICE(ECPKPARAMETERS) = {
221 ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
222 ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
223 ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL)
224 } ASN1_CHOICE_END(ECPKPARAMETERS)
225
226 DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
227 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS)
228 IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS)
229
230 ASN1_SEQUENCE(EC_PRIVATEKEY) = {
231 ASN1_EMBED(EC_PRIVATEKEY, version, INT32),
232 ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
233 ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
234 ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1)
235 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY)
236
237 DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
238 DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY)
239 IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY)
240
241 /* some declarations of internal function */
242
243 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
244 static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *);
245 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
246 static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *);
247
248 /* the function definitions */
249
ec_asn1_group2fieldid(const EC_GROUP * group,X9_62_FIELDID * field)250 static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field)
251 {
252 int ok = 0, nid;
253 BIGNUM *tmp = NULL;
254
255 if (group == NULL || field == NULL)
256 return 0;
257
258 /* clear the old values (if necessary) */
259 ASN1_OBJECT_free(field->fieldType);
260 ASN1_TYPE_free(field->p.other);
261
262 nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group));
263 /* set OID for the field */
264 if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) {
265 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
266 goto err;
267 }
268
269 if (nid == NID_X9_62_prime_field) {
270 if ((tmp = BN_new()) == NULL) {
271 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
272 goto err;
273 }
274 /* the parameters are specified by the prime number p */
275 if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) {
276 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
277 goto err;
278 }
279 /* set the prime number */
280 field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL);
281 if (field->p.prime == NULL) {
282 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
283 goto err;
284 }
285 } else if (nid == NID_X9_62_characteristic_two_field)
286 #ifdef OPENSSL_NO_EC2M
287 {
288 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED);
289 goto err;
290 }
291 #else
292 {
293 int field_type;
294 X9_62_CHARACTERISTIC_TWO *char_two;
295
296 field->p.char_two = X9_62_CHARACTERISTIC_TWO_new();
297 char_two = field->p.char_two;
298
299 if (char_two == NULL) {
300 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
301 goto err;
302 }
303
304 char_two->m = (long)EC_GROUP_get_degree(group);
305
306 field_type = EC_GROUP_get_basis_type(group);
307
308 if (field_type == 0) {
309 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB);
310 goto err;
311 }
312 /* set base type OID */
313 if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) {
314 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB);
315 goto err;
316 }
317
318 if (field_type == NID_X9_62_tpBasis) {
319 unsigned int k;
320
321 if (!EC_GROUP_get_trinomial_basis(group, &k))
322 goto err;
323
324 char_two->p.tpBasis = ASN1_INTEGER_new();
325 if (char_two->p.tpBasis == NULL) {
326 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
327 goto err;
328 }
329 if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) {
330 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB);
331 goto err;
332 }
333 } else if (field_type == NID_X9_62_ppBasis) {
334 unsigned int k1, k2, k3;
335
336 if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3))
337 goto err;
338
339 char_two->p.ppBasis = X9_62_PENTANOMIAL_new();
340 if (char_two->p.ppBasis == NULL) {
341 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
342 goto err;
343 }
344
345 /* set k? values */
346 char_two->p.ppBasis->k1 = (long)k1;
347 char_two->p.ppBasis->k2 = (long)k2;
348 char_two->p.ppBasis->k3 = (long)k3;
349 } else { /* field_type == NID_X9_62_onBasis */
350
351 /* for ONB the parameters are (asn1) NULL */
352 char_two->p.onBasis = ASN1_NULL_new();
353 if (char_two->p.onBasis == NULL) {
354 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE);
355 goto err;
356 }
357 }
358 }
359 #endif
360 else {
361 ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD);
362 goto err;
363 }
364
365 ok = 1;
366
367 err:
368 BN_free(tmp);
369 return ok;
370 }
371
ec_asn1_group2curve(const EC_GROUP * group,X9_62_CURVE * curve)372 static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve)
373 {
374 int ok = 0;
375 BIGNUM *tmp_1 = NULL, *tmp_2 = NULL;
376 unsigned char *a_buf = NULL, *b_buf = NULL;
377 size_t len;
378
379 if (!group || !curve || !curve->a || !curve->b)
380 return 0;
381
382 if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) {
383 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
384 goto err;
385 }
386
387 /* get a and b */
388 if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) {
389 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB);
390 goto err;
391 }
392
393 /*
394 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
395 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
396 * definition of how to encode the field elements.
397 */
398 len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8;
399 if ((a_buf = OPENSSL_malloc(len)) == NULL
400 || (b_buf = OPENSSL_malloc(len)) == NULL) {
401 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
402 goto err;
403 }
404 if (BN_bn2binpad(tmp_1, a_buf, len) < 0
405 || BN_bn2binpad(tmp_2, b_buf, len) < 0) {
406 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB);
407 goto err;
408 }
409
410 /* set a and b */
411 if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len)
412 || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) {
413 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
414 goto err;
415 }
416
417 /* set the seed (optional) */
418 if (group->seed) {
419 if (!curve->seed)
420 if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) {
421 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE);
422 goto err;
423 }
424 curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
425 curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT;
426 if (!ASN1_BIT_STRING_set(curve->seed, group->seed,
427 (int)group->seed_len)) {
428 ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB);
429 goto err;
430 }
431 } else {
432 ASN1_BIT_STRING_free(curve->seed);
433 curve->seed = NULL;
434 }
435
436 ok = 1;
437
438 err:
439 OPENSSL_free(a_buf);
440 OPENSSL_free(b_buf);
441 BN_free(tmp_1);
442 BN_free(tmp_2);
443 return ok;
444 }
445
EC_GROUP_get_ecparameters(const EC_GROUP * group,ECPARAMETERS * params)446 ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group,
447 ECPARAMETERS *params)
448 {
449 size_t len = 0;
450 ECPARAMETERS *ret = NULL;
451 const BIGNUM *tmp;
452 unsigned char *buffer = NULL;
453 const EC_POINT *point = NULL;
454 point_conversion_form_t form;
455 ASN1_INTEGER *orig;
456
457 if (params == NULL) {
458 if ((ret = ECPARAMETERS_new()) == NULL) {
459 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
460 goto err;
461 }
462 } else
463 ret = params;
464
465 /* set the version (always one) */
466 ret->version = (long)0x1;
467
468 /* set the fieldID */
469 if (!ec_asn1_group2fieldid(group, ret->fieldID)) {
470 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
471 goto err;
472 }
473
474 /* set the curve */
475 if (!ec_asn1_group2curve(group, ret->curve)) {
476 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
477 goto err;
478 }
479
480 /* set the base point */
481 if ((point = EC_GROUP_get0_generator(group)) == NULL) {
482 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR);
483 goto err;
484 }
485
486 form = EC_GROUP_get_point_conversion_form(group);
487
488 len = EC_POINT_point2buf(group, point, form, &buffer, NULL);
489 if (len == 0) {
490 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
491 goto err;
492 }
493 if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) {
494 OPENSSL_free(buffer);
495 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
496 goto err;
497 }
498 ASN1_STRING_set0(ret->base, buffer, len);
499
500 /* set the order */
501 tmp = EC_GROUP_get0_order(group);
502 if (tmp == NULL) {
503 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB);
504 goto err;
505 }
506 ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order);
507 if (ret->order == NULL) {
508 ret->order = orig;
509 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
510 goto err;
511 }
512
513 /* set the cofactor (optional) */
514 tmp = EC_GROUP_get0_cofactor(group);
515 if (tmp != NULL) {
516 ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor);
517 if (ret->cofactor == NULL) {
518 ret->cofactor = orig;
519 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB);
520 goto err;
521 }
522 }
523
524 return ret;
525
526 err:
527 if (params == NULL)
528 ECPARAMETERS_free(ret);
529 return NULL;
530 }
531
EC_GROUP_get_ecpkparameters(const EC_GROUP * group,ECPKPARAMETERS * params)532 ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group,
533 ECPKPARAMETERS *params)
534 {
535 int ok = 1, tmp;
536 ECPKPARAMETERS *ret = params;
537
538 if (ret == NULL) {
539 if ((ret = ECPKPARAMETERS_new()) == NULL) {
540 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE);
541 return NULL;
542 }
543 } else {
544 if (ret->type == ECPKPARAMETERS_TYPE_NAMED)
545 ASN1_OBJECT_free(ret->value.named_curve);
546 else if (ret->type == ECPKPARAMETERS_TYPE_EXPLICIT
547 && ret->value.parameters != NULL)
548 ECPARAMETERS_free(ret->value.parameters);
549 }
550
551 if (EC_GROUP_get_asn1_flag(group) == OPENSSL_EC_NAMED_CURVE) {
552 /*
553 * use the asn1 OID to describe the elliptic curve parameters
554 */
555 tmp = EC_GROUP_get_curve_name(group);
556 if (tmp) {
557 ASN1_OBJECT *asn1obj = OBJ_nid2obj(tmp);
558
559 if (asn1obj == NULL || OBJ_length(asn1obj) == 0) {
560 ASN1_OBJECT_free(asn1obj);
561 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, EC_R_MISSING_OID);
562 ok = 0;
563 } else {
564 ret->type = ECPKPARAMETERS_TYPE_NAMED;
565 ret->value.named_curve = asn1obj;
566 }
567 } else
568 /* we don't know the nid => ERROR */
569 ok = 0;
570 } else {
571 /* use the ECPARAMETERS structure */
572 ret->type = ECPKPARAMETERS_TYPE_EXPLICIT;
573 if ((ret->value.parameters =
574 EC_GROUP_get_ecparameters(group, NULL)) == NULL)
575 ok = 0;
576 }
577
578 if (!ok) {
579 ECPKPARAMETERS_free(ret);
580 return NULL;
581 }
582 return ret;
583 }
584
EC_GROUP_new_from_ecparameters(const ECPARAMETERS * params)585 EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params)
586 {
587 int ok = 0, tmp;
588 EC_GROUP *ret = NULL, *dup = NULL;
589 BIGNUM *p = NULL, *a = NULL, *b = NULL;
590 EC_POINT *point = NULL;
591 long field_bits;
592 int curve_name = NID_undef;
593 BN_CTX *ctx = NULL;
594
595 if (!params->fieldID || !params->fieldID->fieldType ||
596 !params->fieldID->p.ptr) {
597 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
598 goto err;
599 }
600
601 /*
602 * Now extract the curve parameters a and b. Note that, although SEC 1
603 * specifies the length of their encodings, historical versions of OpenSSL
604 * encoded them incorrectly, so we must accept any length for backwards
605 * compatibility.
606 */
607 if (!params->curve || !params->curve->a ||
608 !params->curve->a->data || !params->curve->b ||
609 !params->curve->b->data) {
610 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
611 goto err;
612 }
613 a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL);
614 if (a == NULL) {
615 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
616 goto err;
617 }
618 b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL);
619 if (b == NULL) {
620 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
621 goto err;
622 }
623
624 /* get the field parameters */
625 tmp = OBJ_obj2nid(params->fieldID->fieldType);
626 if (tmp == NID_X9_62_characteristic_two_field)
627 #ifdef OPENSSL_NO_EC2M
628 {
629 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED);
630 goto err;
631 }
632 #else
633 {
634 X9_62_CHARACTERISTIC_TWO *char_two;
635
636 char_two = params->fieldID->p.char_two;
637
638 field_bits = char_two->m;
639 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
640 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
641 goto err;
642 }
643
644 if ((p = BN_new()) == NULL) {
645 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
646 goto err;
647 }
648
649 /* get the base type */
650 tmp = OBJ_obj2nid(char_two->type);
651
652 if (tmp == NID_X9_62_tpBasis) {
653 long tmp_long;
654
655 if (!char_two->p.tpBasis) {
656 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
657 goto err;
658 }
659
660 tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis);
661
662 if (!(char_two->m > tmp_long && tmp_long > 0)) {
663 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
664 EC_R_INVALID_TRINOMIAL_BASIS);
665 goto err;
666 }
667
668 /* create the polynomial */
669 if (!BN_set_bit(p, (int)char_two->m))
670 goto err;
671 if (!BN_set_bit(p, (int)tmp_long))
672 goto err;
673 if (!BN_set_bit(p, 0))
674 goto err;
675 } else if (tmp == NID_X9_62_ppBasis) {
676 X9_62_PENTANOMIAL *penta;
677
678 penta = char_two->p.ppBasis;
679 if (!penta) {
680 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
681 goto err;
682 }
683
684 if (!
685 (char_two->m > penta->k3 && penta->k3 > penta->k2
686 && penta->k2 > penta->k1 && penta->k1 > 0)) {
687 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS,
688 EC_R_INVALID_PENTANOMIAL_BASIS);
689 goto err;
690 }
691
692 /* create the polynomial */
693 if (!BN_set_bit(p, (int)char_two->m))
694 goto err;
695 if (!BN_set_bit(p, (int)penta->k1))
696 goto err;
697 if (!BN_set_bit(p, (int)penta->k2))
698 goto err;
699 if (!BN_set_bit(p, (int)penta->k3))
700 goto err;
701 if (!BN_set_bit(p, 0))
702 goto err;
703 } else if (tmp == NID_X9_62_onBasis) {
704 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED);
705 goto err;
706 } else { /* error */
707
708 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
709 goto err;
710 }
711
712 /* create the EC_GROUP structure */
713 ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL);
714 }
715 #endif
716 else if (tmp == NID_X9_62_prime_field) {
717 /* we have a curve over a prime field */
718 /* extract the prime number */
719 if (!params->fieldID->p.prime) {
720 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
721 goto err;
722 }
723 p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL);
724 if (p == NULL) {
725 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
726 goto err;
727 }
728
729 if (BN_is_negative(p) || BN_is_zero(p)) {
730 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
731 goto err;
732 }
733
734 field_bits = BN_num_bits(p);
735 if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) {
736 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE);
737 goto err;
738 }
739
740 /* create the EC_GROUP structure */
741 ret = EC_GROUP_new_curve_GFp(p, a, b, NULL);
742 } else {
743 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD);
744 goto err;
745 }
746
747 if (ret == NULL) {
748 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
749 goto err;
750 }
751
752 /* extract seed (optional) */
753 if (params->curve->seed != NULL) {
754 OPENSSL_free(ret->seed);
755 if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) {
756 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
757 goto err;
758 }
759 memcpy(ret->seed, params->curve->seed->data,
760 params->curve->seed->length);
761 ret->seed_len = params->curve->seed->length;
762 }
763
764 if (params->order == NULL
765 || params->base == NULL
766 || params->base->data == NULL
767 || params->base->length == 0) {
768 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR);
769 goto err;
770 }
771
772 if ((point = EC_POINT_new(ret)) == NULL)
773 goto err;
774
775 /* set the point conversion form */
776 EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t)
777 (params->base->data[0] & ~0x01));
778
779 /* extract the ec point */
780 if (!EC_POINT_oct2point(ret, point, params->base->data,
781 params->base->length, NULL)) {
782 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
783 goto err;
784 }
785
786 /* extract the order */
787 if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) {
788 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
789 goto err;
790 }
791 if (BN_is_negative(a) || BN_is_zero(a)) {
792 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
793 goto err;
794 }
795 if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */
796 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER);
797 goto err;
798 }
799
800 /* extract the cofactor (optional) */
801 if (params->cofactor == NULL) {
802 BN_free(b);
803 b = NULL;
804 } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) {
805 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB);
806 goto err;
807 }
808 /* set the generator, order and cofactor (if present) */
809 if (!EC_GROUP_set_generator(ret, point, a, b)) {
810 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
811 goto err;
812 }
813
814 /*
815 * Check if the explicit parameters group just created matches one of the
816 * built-in curves.
817 *
818 * We create a copy of the group just built, so that we can remove optional
819 * fields for the lookup: we do this to avoid the possibility that one of
820 * the optional parameters is used to force the library into using a less
821 * performant and less secure EC_METHOD instead of the specialized one.
822 * In any case, `seed` is not really used in any computation, while a
823 * cofactor different from the one in the built-in table is just
824 * mathematically wrong anyway and should not be used.
825 */
826 if ((ctx = BN_CTX_new()) == NULL) {
827 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB);
828 goto err;
829 }
830 if ((dup = EC_GROUP_dup(ret)) == NULL
831 || EC_GROUP_set_seed(dup, NULL, 0) != 1
832 || !EC_GROUP_set_generator(dup, point, a, NULL)) {
833 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
834 goto err;
835 }
836 if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) {
837 /*
838 * The input explicit parameters successfully matched one of the
839 * built-in curves: often for built-in curves we have specialized
840 * methods with better performance and hardening.
841 *
842 * In this case we replace the `EC_GROUP` created through explicit
843 * parameters with one created from a named group.
844 */
845 EC_GROUP *named_group = NULL;
846
847 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
848 /*
849 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
850 * the same curve, we prefer the SECP nid when matching explicit
851 * parameters as that is associated with a specialized EC_METHOD.
852 */
853 if (curve_name == NID_wap_wsg_idm_ecid_wtls12)
854 curve_name = NID_secp224r1;
855 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
856
857 if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) {
858 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB);
859 goto err;
860 }
861 EC_GROUP_free(ret);
862 ret = named_group;
863
864 /*
865 * Set the flag so that EC_GROUPs created from explicit parameters are
866 * serialized using explicit parameters by default.
867 */
868 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
869
870 /*
871 * If the input params do not contain the optional seed field we make
872 * sure it is not added to the returned group.
873 *
874 * The seed field is not really used inside libcrypto anyway, and
875 * adding it to parsed explicit parameter keys would alter their DER
876 * encoding output (because of the extra field) which could impact
877 * applications fingerprinting keys by their DER encoding.
878 */
879 if (params->curve->seed == NULL) {
880 if (EC_GROUP_set_seed(ret, NULL, 0) != 1)
881 goto err;
882 }
883 }
884
885 ok = 1;
886
887 err:
888 if (!ok) {
889 EC_GROUP_free(ret);
890 ret = NULL;
891 }
892 EC_GROUP_free(dup);
893
894 BN_free(p);
895 BN_free(a);
896 BN_free(b);
897 EC_POINT_free(point);
898
899 BN_CTX_free(ctx);
900
901 return ret;
902 }
903
EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS * params)904 EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params)
905 {
906 EC_GROUP *ret = NULL;
907 int tmp = 0;
908
909 if (params == NULL) {
910 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS);
911 return NULL;
912 }
913
914 if (params->type == ECPKPARAMETERS_TYPE_NAMED) {
915 /* the curve is given by an OID */
916 tmp = OBJ_obj2nid(params->value.named_curve);
917 if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) {
918 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS,
919 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
920 return NULL;
921 }
922 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE);
923 } else if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT) {
924 /* the parameters are given by an ECPARAMETERS structure */
925 ret = EC_GROUP_new_from_ecparameters(params->value.parameters);
926 if (!ret) {
927 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB);
928 return NULL;
929 }
930 EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE);
931 } else if (params->type == ECPKPARAMETERS_TYPE_IMPLICIT) {
932 /* implicit parameters inherited from CA - unsupported */
933 return NULL;
934 } else {
935 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR);
936 return NULL;
937 }
938
939 return ret;
940 }
941
942 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
943
d2i_ECPKParameters(EC_GROUP ** a,const unsigned char ** in,long len)944 EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len)
945 {
946 EC_GROUP *group = NULL;
947 ECPKPARAMETERS *params = NULL;
948 const unsigned char *p = *in;
949
950 if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) {
951 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE);
952 ECPKPARAMETERS_free(params);
953 return NULL;
954 }
955
956 if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) {
957 ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE);
958 ECPKPARAMETERS_free(params);
959 return NULL;
960 }
961
962 if (params->type == ECPKPARAMETERS_TYPE_EXPLICIT)
963 group->decoded_from_explicit_params = 1;
964
965 if (a) {
966 EC_GROUP_free(*a);
967 *a = group;
968 }
969
970 ECPKPARAMETERS_free(params);
971 *in = p;
972 return group;
973 }
974
i2d_ECPKParameters(const EC_GROUP * a,unsigned char ** out)975 int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out)
976 {
977 int ret = 0;
978 ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL);
979 if (tmp == NULL) {
980 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE);
981 return 0;
982 }
983 if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) {
984 ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE);
985 ECPKPARAMETERS_free(tmp);
986 return 0;
987 }
988 ECPKPARAMETERS_free(tmp);
989 return ret;
990 }
991
992 /* some EC_KEY functions */
993
d2i_ECPrivateKey(EC_KEY ** a,const unsigned char ** in,long len)994 EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len)
995 {
996 EC_KEY *ret = NULL;
997 EC_PRIVATEKEY *priv_key = NULL;
998 const unsigned char *p = *in;
999
1000 if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) {
1001 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1002 return NULL;
1003 }
1004
1005 if (a == NULL || *a == NULL) {
1006 if ((ret = EC_KEY_new()) == NULL) {
1007 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1008 goto err;
1009 }
1010 } else
1011 ret = *a;
1012
1013 if (priv_key->parameters) {
1014 EC_GROUP_free(ret->group);
1015 ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters);
1016 if (ret->group != NULL
1017 && priv_key->parameters->type == ECPKPARAMETERS_TYPE_EXPLICIT)
1018 ret->group->decoded_from_explicit_params = 1;
1019 }
1020
1021 if (ret->group == NULL) {
1022 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1023 goto err;
1024 }
1025
1026 ret->version = priv_key->version;
1027
1028 if (priv_key->privateKey) {
1029 ASN1_OCTET_STRING *pkey = priv_key->privateKey;
1030 if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey),
1031 ASN1_STRING_length(pkey)) == 0)
1032 goto err;
1033 } else {
1034 ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY);
1035 goto err;
1036 }
1037
1038 EC_POINT_clear_free(ret->pub_key);
1039 ret->pub_key = EC_POINT_new(ret->group);
1040 if (ret->pub_key == NULL) {
1041 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1042 goto err;
1043 }
1044
1045 if (priv_key->publicKey) {
1046 const unsigned char *pub_oct;
1047 int pub_oct_len;
1048
1049 pub_oct = ASN1_STRING_get0_data(priv_key->publicKey);
1050 pub_oct_len = ASN1_STRING_length(priv_key->publicKey);
1051 if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) {
1052 ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB);
1053 goto err;
1054 }
1055 } else {
1056 if (ret->group->meth->keygenpub == NULL
1057 || ret->group->meth->keygenpub(ret) == 0)
1058 goto err;
1059 /* Remember the original private-key-only encoding. */
1060 ret->enc_flag |= EC_PKEY_NO_PUBKEY;
1061 }
1062
1063 if (a)
1064 *a = ret;
1065 EC_PRIVATEKEY_free(priv_key);
1066 *in = p;
1067 return ret;
1068
1069 err:
1070 if (a == NULL || *a != ret)
1071 EC_KEY_free(ret);
1072 EC_PRIVATEKEY_free(priv_key);
1073 return NULL;
1074 }
1075
i2d_ECPrivateKey(EC_KEY * a,unsigned char ** out)1076 int i2d_ECPrivateKey(EC_KEY *a, unsigned char **out)
1077 {
1078 int ret = 0, ok = 0;
1079 unsigned char *priv= NULL, *pub= NULL;
1080 size_t privlen = 0, publen = 0;
1081
1082 EC_PRIVATEKEY *priv_key = NULL;
1083
1084 if (a == NULL || a->group == NULL ||
1085 (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) {
1086 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER);
1087 goto err;
1088 }
1089
1090 if ((priv_key = EC_PRIVATEKEY_new()) == NULL) {
1091 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1092 goto err;
1093 }
1094
1095 priv_key->version = a->version;
1096
1097 privlen = EC_KEY_priv2buf(a, &priv);
1098
1099 if (privlen == 0) {
1100 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1101 goto err;
1102 }
1103
1104 ASN1_STRING_set0(priv_key->privateKey, priv, privlen);
1105 priv = NULL;
1106
1107 if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) {
1108 if ((priv_key->parameters =
1109 EC_GROUP_get_ecpkparameters(a->group,
1110 priv_key->parameters)) == NULL) {
1111 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1112 goto err;
1113 }
1114 }
1115
1116 if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) {
1117 priv_key->publicKey = ASN1_BIT_STRING_new();
1118 if (priv_key->publicKey == NULL) {
1119 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE);
1120 goto err;
1121 }
1122
1123 publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL);
1124
1125 if (publen == 0) {
1126 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1127 goto err;
1128 }
1129
1130 priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
1131 priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
1132 ASN1_STRING_set0(priv_key->publicKey, pub, publen);
1133 pub = NULL;
1134 }
1135
1136 if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) {
1137 ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB);
1138 goto err;
1139 }
1140 ok = 1;
1141 err:
1142 OPENSSL_clear_free(priv, privlen);
1143 OPENSSL_free(pub);
1144 EC_PRIVATEKEY_free(priv_key);
1145 return (ok ? ret : 0);
1146 }
1147
i2d_ECParameters(EC_KEY * a,unsigned char ** out)1148 int i2d_ECParameters(EC_KEY *a, unsigned char **out)
1149 {
1150 if (a == NULL) {
1151 ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1152 return 0;
1153 }
1154 return i2d_ECPKParameters(a->group, out);
1155 }
1156
d2i_ECParameters(EC_KEY ** a,const unsigned char ** in,long len)1157 EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len)
1158 {
1159 EC_KEY *ret;
1160
1161 if (in == NULL || *in == NULL) {
1162 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER);
1163 return NULL;
1164 }
1165
1166 if (a == NULL || *a == NULL) {
1167 if ((ret = EC_KEY_new()) == NULL) {
1168 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE);
1169 return NULL;
1170 }
1171 } else
1172 ret = *a;
1173
1174 if (!d2i_ECPKParameters(&ret->group, in, len)) {
1175 ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB);
1176 if (a == NULL || *a != ret)
1177 EC_KEY_free(ret);
1178 return NULL;
1179 }
1180
1181 if (a)
1182 *a = ret;
1183
1184 return ret;
1185 }
1186
o2i_ECPublicKey(EC_KEY ** a,const unsigned char ** in,long len)1187 EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len)
1188 {
1189 EC_KEY *ret = NULL;
1190
1191 if (a == NULL || (*a) == NULL || (*a)->group == NULL) {
1192 /*
1193 * sorry, but a EC_GROUP-structure is necessary to set the public key
1194 */
1195 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1196 return 0;
1197 }
1198 ret = *a;
1199 if (!EC_KEY_oct2key(ret, *in, len, NULL)) {
1200 ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB);
1201 return 0;
1202 }
1203 *in += len;
1204 return ret;
1205 }
1206
i2o_ECPublicKey(const EC_KEY * a,unsigned char ** out)1207 int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out)
1208 {
1209 size_t buf_len = 0;
1210 int new_buffer = 0;
1211
1212 if (a == NULL) {
1213 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER);
1214 return 0;
1215 }
1216
1217 buf_len = EC_POINT_point2oct(a->group, a->pub_key,
1218 a->conv_form, NULL, 0, NULL);
1219
1220 if (out == NULL || buf_len == 0)
1221 /* out == NULL => just return the length of the octet string */
1222 return buf_len;
1223
1224 if (*out == NULL) {
1225 if ((*out = OPENSSL_malloc(buf_len)) == NULL) {
1226 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE);
1227 return 0;
1228 }
1229 new_buffer = 1;
1230 }
1231 if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form,
1232 *out, buf_len, NULL)) {
1233 ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB);
1234 if (new_buffer) {
1235 OPENSSL_free(*out);
1236 *out = NULL;
1237 }
1238 return 0;
1239 }
1240 if (!new_buffer)
1241 *out += buf_len;
1242 return buf_len;
1243 }
1244
1245 ASN1_SEQUENCE(ECDSA_SIG) = {
1246 ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM),
1247 ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM)
1248 } static_ASN1_SEQUENCE_END(ECDSA_SIG)
1249
1250 DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG)
1251 DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG)
1252 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(ECDSA_SIG, ECDSA_SIG, ECDSA_SIG)
1253
1254 ECDSA_SIG *ECDSA_SIG_new(void)
1255 {
1256 ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig));
1257 if (sig == NULL)
1258 ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE);
1259 return sig;
1260 }
1261
ECDSA_SIG_free(ECDSA_SIG * sig)1262 void ECDSA_SIG_free(ECDSA_SIG *sig)
1263 {
1264 if (sig == NULL)
1265 return;
1266 BN_clear_free(sig->r);
1267 BN_clear_free(sig->s);
1268 OPENSSL_free(sig);
1269 }
1270
ECDSA_SIG_get0(const ECDSA_SIG * sig,const BIGNUM ** pr,const BIGNUM ** ps)1271 void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps)
1272 {
1273 if (pr != NULL)
1274 *pr = sig->r;
1275 if (ps != NULL)
1276 *ps = sig->s;
1277 }
1278
ECDSA_SIG_get0_r(const ECDSA_SIG * sig)1279 const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig)
1280 {
1281 return sig->r;
1282 }
1283
ECDSA_SIG_get0_s(const ECDSA_SIG * sig)1284 const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig)
1285 {
1286 return sig->s;
1287 }
1288
ECDSA_SIG_set0(ECDSA_SIG * sig,BIGNUM * r,BIGNUM * s)1289 int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s)
1290 {
1291 if (r == NULL || s == NULL)
1292 return 0;
1293 BN_clear_free(sig->r);
1294 BN_clear_free(sig->s);
1295 sig->r = r;
1296 sig->s = s;
1297 return 1;
1298 }
1299
ECDSA_size(const EC_KEY * r)1300 int ECDSA_size(const EC_KEY *r)
1301 {
1302 int ret, i;
1303 ASN1_INTEGER bs;
1304 unsigned char buf[4];
1305 const EC_GROUP *group;
1306
1307 if (r == NULL)
1308 return 0;
1309 group = EC_KEY_get0_group(r);
1310 if (group == NULL)
1311 return 0;
1312
1313 i = EC_GROUP_order_bits(group);
1314 if (i == 0)
1315 return 0;
1316 bs.length = (i + 7) / 8;
1317 bs.data = buf;
1318 bs.type = V_ASN1_INTEGER;
1319 /* If the top bit is set the asn1 encoding is 1 larger. */
1320 buf[0] = 0xff;
1321
1322 i = i2d_ASN1_INTEGER(&bs, NULL);
1323 i += i; /* r and s */
1324 ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE);
1325 if (ret < 0)
1326 return 0;
1327 return ret;
1328 }
1329