1 | /* |
2 | * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved. |
3 | * |
4 | * Licensed under the Apache License 2.0 (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 | #include "crypto/asn1_dsa.h" |
17 | |
18 | #ifndef FIPS_MODE |
19 | |
20 | int EC_GROUP_get_basis_type(const EC_GROUP *group) |
21 | { |
22 | int i; |
23 | |
24 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
25 | NID_X9_62_characteristic_two_field) |
26 | /* everything else is currently not supported */ |
27 | return 0; |
28 | |
29 | /* Find the last non-zero element of group->poly[] */ |
30 | for (i = 0; |
31 | i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0; |
32 | i++) |
33 | continue; |
34 | |
35 | if (i == 4) |
36 | return NID_X9_62_ppBasis; |
37 | else if (i == 2) |
38 | return NID_X9_62_tpBasis; |
39 | else |
40 | /* everything else is currently not supported */ |
41 | return 0; |
42 | } |
43 | |
44 | #ifndef OPENSSL_NO_EC2M |
45 | int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k) |
46 | { |
47 | if (group == NULL) |
48 | return 0; |
49 | |
50 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
51 | NID_X9_62_characteristic_two_field |
52 | || !((group->poly[0] != 0) && (group->poly[1] != 0) |
53 | && (group->poly[2] == 0))) { |
54 | ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS, |
55 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
56 | return 0; |
57 | } |
58 | |
59 | if (k) |
60 | *k = group->poly[1]; |
61 | |
62 | return 1; |
63 | } |
64 | |
65 | int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1, |
66 | unsigned int *k2, unsigned int *k3) |
67 | { |
68 | if (group == NULL) |
69 | return 0; |
70 | |
71 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) != |
72 | NID_X9_62_characteristic_two_field |
73 | || !((group->poly[0] != 0) && (group->poly[1] != 0) |
74 | && (group->poly[2] != 0) && (group->poly[3] != 0) |
75 | && (group->poly[4] == 0))) { |
76 | ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS, |
77 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
78 | return 0; |
79 | } |
80 | |
81 | if (k1) |
82 | *k1 = group->poly[3]; |
83 | if (k2) |
84 | *k2 = group->poly[2]; |
85 | if (k3) |
86 | *k3 = group->poly[1]; |
87 | |
88 | return 1; |
89 | } |
90 | #endif |
91 | |
92 | /* some structures needed for the asn1 encoding */ |
93 | typedef struct x9_62_pentanomial_st { |
94 | int32_t k1; |
95 | int32_t k2; |
96 | int32_t k3; |
97 | } X9_62_PENTANOMIAL; |
98 | |
99 | typedef struct x9_62_characteristic_two_st { |
100 | int32_t m; |
101 | ASN1_OBJECT *type; |
102 | union { |
103 | char *ptr; |
104 | /* NID_X9_62_onBasis */ |
105 | ASN1_NULL *onBasis; |
106 | /* NID_X9_62_tpBasis */ |
107 | ASN1_INTEGER *tpBasis; |
108 | /* NID_X9_62_ppBasis */ |
109 | X9_62_PENTANOMIAL *ppBasis; |
110 | /* anything else */ |
111 | ASN1_TYPE *other; |
112 | } p; |
113 | } X9_62_CHARACTERISTIC_TWO; |
114 | |
115 | typedef struct x9_62_fieldid_st { |
116 | ASN1_OBJECT *fieldType; |
117 | union { |
118 | char *ptr; |
119 | /* NID_X9_62_prime_field */ |
120 | ASN1_INTEGER *prime; |
121 | /* NID_X9_62_characteristic_two_field */ |
122 | X9_62_CHARACTERISTIC_TWO *char_two; |
123 | /* anything else */ |
124 | ASN1_TYPE *other; |
125 | } p; |
126 | } X9_62_FIELDID; |
127 | |
128 | typedef struct x9_62_curve_st { |
129 | ASN1_OCTET_STRING *a; |
130 | ASN1_OCTET_STRING *b; |
131 | ASN1_BIT_STRING *seed; |
132 | } X9_62_CURVE; |
133 | |
134 | struct ec_parameters_st { |
135 | int32_t version; |
136 | X9_62_FIELDID *fieldID; |
137 | X9_62_CURVE *curve; |
138 | ASN1_OCTET_STRING *base; |
139 | ASN1_INTEGER *order; |
140 | ASN1_INTEGER *cofactor; |
141 | } /* ECPARAMETERS */ ; |
142 | |
143 | struct ecpk_parameters_st { |
144 | int type; |
145 | union { |
146 | ASN1_OBJECT *named_curve; |
147 | ECPARAMETERS *parameters; |
148 | ASN1_NULL *implicitlyCA; |
149 | } value; |
150 | } /* ECPKPARAMETERS */ ; |
151 | |
152 | /* SEC1 ECPrivateKey */ |
153 | typedef struct ec_privatekey_st { |
154 | int32_t version; |
155 | ASN1_OCTET_STRING *privateKey; |
156 | ECPKPARAMETERS *parameters; |
157 | ASN1_BIT_STRING *publicKey; |
158 | } EC_PRIVATEKEY; |
159 | |
160 | /* the OpenSSL ASN.1 definitions */ |
161 | ASN1_SEQUENCE(X9_62_PENTANOMIAL) = { |
162 | ASN1_EMBED(X9_62_PENTANOMIAL, k1, INT32), |
163 | ASN1_EMBED(X9_62_PENTANOMIAL, k2, INT32), |
164 | ASN1_EMBED(X9_62_PENTANOMIAL, k3, INT32) |
165 | } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL) |
166 | |
167 | DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL) |
168 | IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL) |
169 | |
170 | ASN1_ADB_TEMPLATE(char_two_def) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.other, ASN1_ANY); |
171 | |
172 | ASN1_ADB(X9_62_CHARACTERISTIC_TWO) = { |
173 | ADB_ENTRY(NID_X9_62_onBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.onBasis, ASN1_NULL)), |
174 | ADB_ENTRY(NID_X9_62_tpBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.tpBasis, ASN1_INTEGER)), |
175 | ADB_ENTRY(NID_X9_62_ppBasis, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, p.ppBasis, X9_62_PENTANOMIAL)) |
176 | } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO, 0, type, 0, &char_two_def_tt, NULL); |
177 | |
178 | ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO) = { |
179 | ASN1_EMBED(X9_62_CHARACTERISTIC_TWO, m, INT32), |
180 | ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO, type, ASN1_OBJECT), |
181 | ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO) |
182 | } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO) |
183 | |
184 | DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO) |
185 | IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO) |
186 | |
187 | ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY); |
188 | |
189 | ASN1_ADB(X9_62_FIELDID) = { |
190 | ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)), |
191 | ADB_ENTRY(NID_X9_62_characteristic_two_field, ASN1_SIMPLE(X9_62_FIELDID, p.char_two, X9_62_CHARACTERISTIC_TWO)) |
192 | } ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL); |
193 | |
194 | ASN1_SEQUENCE(X9_62_FIELDID) = { |
195 | ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT), |
196 | ASN1_ADB_OBJECT(X9_62_FIELDID) |
197 | } static_ASN1_SEQUENCE_END(X9_62_FIELDID) |
198 | |
199 | ASN1_SEQUENCE(X9_62_CURVE) = { |
200 | ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING), |
201 | ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING), |
202 | ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING) |
203 | } static_ASN1_SEQUENCE_END(X9_62_CURVE) |
204 | |
205 | ASN1_SEQUENCE(ECPARAMETERS) = { |
206 | ASN1_EMBED(ECPARAMETERS, version, INT32), |
207 | ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID), |
208 | ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE), |
209 | ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING), |
210 | ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER), |
211 | ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER) |
212 | } ASN1_SEQUENCE_END(ECPARAMETERS) |
213 | |
214 | DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS) |
215 | IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS) |
216 | |
217 | ASN1_CHOICE(ECPKPARAMETERS) = { |
218 | ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT), |
219 | ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS), |
220 | ASN1_SIMPLE(ECPKPARAMETERS, value.implicitlyCA, ASN1_NULL) |
221 | } ASN1_CHOICE_END(ECPKPARAMETERS) |
222 | |
223 | DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS) |
224 | DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS, ECPKPARAMETERS) |
225 | IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS) |
226 | |
227 | ASN1_SEQUENCE(EC_PRIVATEKEY) = { |
228 | ASN1_EMBED(EC_PRIVATEKEY, version, INT32), |
229 | ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING), |
230 | ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0), |
231 | ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1) |
232 | } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY) |
233 | |
234 | DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY) |
235 | DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY, EC_PRIVATEKEY) |
236 | IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY) |
237 | |
238 | /* some declarations of internal function */ |
239 | |
240 | /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */ |
241 | static int ec_asn1_group2fieldid(const EC_GROUP *, X9_62_FIELDID *); |
242 | /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */ |
243 | static int ec_asn1_group2curve(const EC_GROUP *, X9_62_CURVE *); |
244 | |
245 | /* the function definitions */ |
246 | |
247 | static int ec_asn1_group2fieldid(const EC_GROUP *group, X9_62_FIELDID *field) |
248 | { |
249 | int ok = 0, nid; |
250 | BIGNUM *tmp = NULL; |
251 | |
252 | if (group == NULL || field == NULL) |
253 | return 0; |
254 | |
255 | /* clear the old values (if necessary) */ |
256 | ASN1_OBJECT_free(field->fieldType); |
257 | ASN1_TYPE_free(field->p.other); |
258 | |
259 | nid = EC_METHOD_get_field_type(EC_GROUP_method_of(group)); |
260 | /* set OID for the field */ |
261 | if ((field->fieldType = OBJ_nid2obj(nid)) == NULL) { |
262 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); |
263 | goto err; |
264 | } |
265 | |
266 | if (nid == NID_X9_62_prime_field) { |
267 | if ((tmp = BN_new()) == NULL) { |
268 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
269 | goto err; |
270 | } |
271 | /* the parameters are specified by the prime number p */ |
272 | if (!EC_GROUP_get_curve(group, tmp, NULL, NULL, NULL)) { |
273 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); |
274 | goto err; |
275 | } |
276 | /* set the prime number */ |
277 | field->p.prime = BN_to_ASN1_INTEGER(tmp, NULL); |
278 | if (field->p.prime == NULL) { |
279 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB); |
280 | goto err; |
281 | } |
282 | } else if (nid == NID_X9_62_characteristic_two_field) |
283 | #ifdef OPENSSL_NO_EC2M |
284 | { |
285 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_GF2M_NOT_SUPPORTED); |
286 | goto err; |
287 | } |
288 | #else |
289 | { |
290 | int field_type; |
291 | X9_62_CHARACTERISTIC_TWO *char_two; |
292 | |
293 | field->p.char_two = X9_62_CHARACTERISTIC_TWO_new(); |
294 | char_two = field->p.char_two; |
295 | |
296 | if (char_two == NULL) { |
297 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
298 | goto err; |
299 | } |
300 | |
301 | char_two->m = (long)EC_GROUP_get_degree(group); |
302 | |
303 | field_type = EC_GROUP_get_basis_type(group); |
304 | |
305 | if (field_type == 0) { |
306 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_EC_LIB); |
307 | goto err; |
308 | } |
309 | /* set base type OID */ |
310 | if ((char_two->type = OBJ_nid2obj(field_type)) == NULL) { |
311 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_OBJ_LIB); |
312 | goto err; |
313 | } |
314 | |
315 | if (field_type == NID_X9_62_tpBasis) { |
316 | unsigned int k; |
317 | |
318 | if (!EC_GROUP_get_trinomial_basis(group, &k)) |
319 | goto err; |
320 | |
321 | char_two->p.tpBasis = ASN1_INTEGER_new(); |
322 | if (char_two->p.tpBasis == NULL) { |
323 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
324 | goto err; |
325 | } |
326 | if (!ASN1_INTEGER_set(char_two->p.tpBasis, (long)k)) { |
327 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_ASN1_LIB); |
328 | goto err; |
329 | } |
330 | } else if (field_type == NID_X9_62_ppBasis) { |
331 | unsigned int k1, k2, k3; |
332 | |
333 | if (!EC_GROUP_get_pentanomial_basis(group, &k1, &k2, &k3)) |
334 | goto err; |
335 | |
336 | char_two->p.ppBasis = X9_62_PENTANOMIAL_new(); |
337 | if (char_two->p.ppBasis == NULL) { |
338 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
339 | goto err; |
340 | } |
341 | |
342 | /* set k? values */ |
343 | char_two->p.ppBasis->k1 = (long)k1; |
344 | char_two->p.ppBasis->k2 = (long)k2; |
345 | char_two->p.ppBasis->k3 = (long)k3; |
346 | } else { /* field_type == NID_X9_62_onBasis */ |
347 | |
348 | /* for ONB the parameters are (asn1) NULL */ |
349 | char_two->p.onBasis = ASN1_NULL_new(); |
350 | if (char_two->p.onBasis == NULL) { |
351 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, ERR_R_MALLOC_FAILURE); |
352 | goto err; |
353 | } |
354 | } |
355 | } |
356 | #endif |
357 | else { |
358 | ECerr(EC_F_EC_ASN1_GROUP2FIELDID, EC_R_UNSUPPORTED_FIELD); |
359 | goto err; |
360 | } |
361 | |
362 | ok = 1; |
363 | |
364 | err: |
365 | BN_free(tmp); |
366 | return ok; |
367 | } |
368 | |
369 | static int ec_asn1_group2curve(const EC_GROUP *group, X9_62_CURVE *curve) |
370 | { |
371 | int ok = 0; |
372 | BIGNUM *tmp_1 = NULL, *tmp_2 = NULL; |
373 | unsigned char *a_buf = NULL, *b_buf = NULL; |
374 | size_t len; |
375 | |
376 | if (!group || !curve || !curve->a || !curve->b) |
377 | return 0; |
378 | |
379 | if ((tmp_1 = BN_new()) == NULL || (tmp_2 = BN_new()) == NULL) { |
380 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); |
381 | goto err; |
382 | } |
383 | |
384 | /* get a and b */ |
385 | if (!EC_GROUP_get_curve(group, NULL, tmp_1, tmp_2, NULL)) { |
386 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_EC_LIB); |
387 | goto err; |
388 | } |
389 | |
390 | /* |
391 | * Per SEC 1, the curve coefficients must be padded up to size. See C.2's |
392 | * definition of Curve, C.1's definition of FieldElement, and 2.3.5's |
393 | * definition of how to encode the field elements. |
394 | */ |
395 | len = ((size_t)EC_GROUP_get_degree(group) + 7) / 8; |
396 | if ((a_buf = OPENSSL_malloc(len)) == NULL |
397 | || (b_buf = OPENSSL_malloc(len)) == NULL) { |
398 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); |
399 | goto err; |
400 | } |
401 | if (BN_bn2binpad(tmp_1, a_buf, len) < 0 |
402 | || BN_bn2binpad(tmp_2, b_buf, len) < 0) { |
403 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_BN_LIB); |
404 | goto err; |
405 | } |
406 | |
407 | /* set a and b */ |
408 | if (!ASN1_OCTET_STRING_set(curve->a, a_buf, len) |
409 | || !ASN1_OCTET_STRING_set(curve->b, b_buf, len)) { |
410 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); |
411 | goto err; |
412 | } |
413 | |
414 | /* set the seed (optional) */ |
415 | if (group->seed) { |
416 | if (!curve->seed) |
417 | if ((curve->seed = ASN1_BIT_STRING_new()) == NULL) { |
418 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_MALLOC_FAILURE); |
419 | goto err; |
420 | } |
421 | curve->seed->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); |
422 | curve->seed->flags |= ASN1_STRING_FLAG_BITS_LEFT; |
423 | if (!ASN1_BIT_STRING_set(curve->seed, group->seed, |
424 | (int)group->seed_len)) { |
425 | ECerr(EC_F_EC_ASN1_GROUP2CURVE, ERR_R_ASN1_LIB); |
426 | goto err; |
427 | } |
428 | } else { |
429 | ASN1_BIT_STRING_free(curve->seed); |
430 | curve->seed = NULL; |
431 | } |
432 | |
433 | ok = 1; |
434 | |
435 | err: |
436 | OPENSSL_free(a_buf); |
437 | OPENSSL_free(b_buf); |
438 | BN_free(tmp_1); |
439 | BN_free(tmp_2); |
440 | return ok; |
441 | } |
442 | |
443 | ECPARAMETERS *EC_GROUP_get_ecparameters(const EC_GROUP *group, |
444 | ECPARAMETERS *params) |
445 | { |
446 | size_t len = 0; |
447 | ECPARAMETERS *ret = NULL; |
448 | const BIGNUM *tmp; |
449 | unsigned char *buffer = NULL; |
450 | const EC_POINT *point = NULL; |
451 | point_conversion_form_t form; |
452 | ASN1_INTEGER *orig; |
453 | |
454 | if (params == NULL) { |
455 | if ((ret = ECPARAMETERS_new()) == NULL) { |
456 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE); |
457 | goto err; |
458 | } |
459 | } else |
460 | ret = params; |
461 | |
462 | /* set the version (always one) */ |
463 | ret->version = (long)0x1; |
464 | |
465 | /* set the fieldID */ |
466 | if (!ec_asn1_group2fieldid(group, ret->fieldID)) { |
467 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); |
468 | goto err; |
469 | } |
470 | |
471 | /* set the curve */ |
472 | if (!ec_asn1_group2curve(group, ret->curve)) { |
473 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); |
474 | goto err; |
475 | } |
476 | |
477 | /* set the base point */ |
478 | if ((point = EC_GROUP_get0_generator(group)) == NULL) { |
479 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, EC_R_UNDEFINED_GENERATOR); |
480 | goto err; |
481 | } |
482 | |
483 | form = EC_GROUP_get_point_conversion_form(group); |
484 | |
485 | len = EC_POINT_point2buf(group, point, form, &buffer, NULL); |
486 | if (len == 0) { |
487 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); |
488 | goto err; |
489 | } |
490 | if (ret->base == NULL && (ret->base = ASN1_OCTET_STRING_new()) == NULL) { |
491 | OPENSSL_free(buffer); |
492 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_MALLOC_FAILURE); |
493 | goto err; |
494 | } |
495 | ASN1_STRING_set0(ret->base, buffer, len); |
496 | |
497 | /* set the order */ |
498 | tmp = EC_GROUP_get0_order(group); |
499 | if (tmp == NULL) { |
500 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_EC_LIB); |
501 | goto err; |
502 | } |
503 | ret->order = BN_to_ASN1_INTEGER(tmp, orig = ret->order); |
504 | if (ret->order == NULL) { |
505 | ret->order = orig; |
506 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB); |
507 | goto err; |
508 | } |
509 | |
510 | /* set the cofactor (optional) */ |
511 | tmp = EC_GROUP_get0_cofactor(group); |
512 | if (tmp != NULL) { |
513 | ret->cofactor = BN_to_ASN1_INTEGER(tmp, orig = ret->cofactor); |
514 | if (ret->cofactor == NULL) { |
515 | ret->cofactor = orig; |
516 | ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS, ERR_R_ASN1_LIB); |
517 | goto err; |
518 | } |
519 | } |
520 | |
521 | return ret; |
522 | |
523 | err: |
524 | if (params == NULL) |
525 | ECPARAMETERS_free(ret); |
526 | return NULL; |
527 | } |
528 | |
529 | ECPKPARAMETERS *EC_GROUP_get_ecpkparameters(const EC_GROUP *group, |
530 | ECPKPARAMETERS *params) |
531 | { |
532 | int ok = 1, tmp; |
533 | ECPKPARAMETERS *ret = params; |
534 | |
535 | if (ret == NULL) { |
536 | if ((ret = ECPKPARAMETERS_new()) == NULL) { |
537 | ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS, ERR_R_MALLOC_FAILURE); |
538 | return NULL; |
539 | } |
540 | } else { |
541 | if (ret->type == 0) |
542 | ASN1_OBJECT_free(ret->value.named_curve); |
543 | else if (ret->type == 1 && ret->value.parameters) |
544 | ECPARAMETERS_free(ret->value.parameters); |
545 | } |
546 | |
547 | if (EC_GROUP_get_asn1_flag(group)) { |
548 | /* |
549 | * use the asn1 OID to describe the elliptic curve parameters |
550 | */ |
551 | tmp = EC_GROUP_get_curve_name(group); |
552 | if (tmp) { |
553 | ret->type = 0; |
554 | if ((ret->value.named_curve = OBJ_nid2obj(tmp)) == NULL) |
555 | ok = 0; |
556 | } else |
557 | /* we don't know the nid => ERROR */ |
558 | ok = 0; |
559 | } else { |
560 | /* use the ECPARAMETERS structure */ |
561 | ret->type = 1; |
562 | if ((ret->value.parameters = |
563 | EC_GROUP_get_ecparameters(group, NULL)) == NULL) |
564 | ok = 0; |
565 | } |
566 | |
567 | if (!ok) { |
568 | ECPKPARAMETERS_free(ret); |
569 | return NULL; |
570 | } |
571 | return ret; |
572 | } |
573 | |
574 | EC_GROUP *EC_GROUP_new_from_ecparameters(const ECPARAMETERS *params) |
575 | { |
576 | int ok = 0, tmp; |
577 | EC_GROUP *ret = NULL, *dup = NULL; |
578 | BIGNUM *p = NULL, *a = NULL, *b = NULL; |
579 | EC_POINT *point = NULL; |
580 | long field_bits; |
581 | int curve_name = NID_undef; |
582 | BN_CTX *ctx = NULL; |
583 | |
584 | if (params->fieldID == NULL |
585 | || params->fieldID->fieldType == NULL |
586 | || params->fieldID->p.ptr == NULL) { |
587 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
588 | goto err; |
589 | } |
590 | |
591 | /* |
592 | * Now extract the curve parameters a and b. Note that, although SEC 1 |
593 | * specifies the length of their encodings, historical versions of OpenSSL |
594 | * encoded them incorrectly, so we must accept any length for backwards |
595 | * compatibility. |
596 | */ |
597 | if (params->curve == NULL |
598 | || params->curve->a == NULL || params->curve->a->data == NULL |
599 | || params->curve->b == NULL || params->curve->b->data == NULL) { |
600 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
601 | goto err; |
602 | } |
603 | a = BN_bin2bn(params->curve->a->data, params->curve->a->length, NULL); |
604 | if (a == NULL) { |
605 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); |
606 | goto err; |
607 | } |
608 | b = BN_bin2bn(params->curve->b->data, params->curve->b->length, NULL); |
609 | if (b == NULL) { |
610 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); |
611 | goto err; |
612 | } |
613 | |
614 | /* get the field parameters */ |
615 | tmp = OBJ_obj2nid(params->fieldID->fieldType); |
616 | if (tmp == NID_X9_62_characteristic_two_field) |
617 | #ifdef OPENSSL_NO_EC2M |
618 | { |
619 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_GF2M_NOT_SUPPORTED); |
620 | goto err; |
621 | } |
622 | #else |
623 | { |
624 | X9_62_CHARACTERISTIC_TWO *char_two; |
625 | |
626 | char_two = params->fieldID->p.char_two; |
627 | |
628 | field_bits = char_two->m; |
629 | if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { |
630 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE); |
631 | goto err; |
632 | } |
633 | |
634 | if ((p = BN_new()) == NULL) { |
635 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE); |
636 | goto err; |
637 | } |
638 | |
639 | /* get the base type */ |
640 | tmp = OBJ_obj2nid(char_two->type); |
641 | |
642 | if (tmp == NID_X9_62_tpBasis) { |
643 | long tmp_long; |
644 | |
645 | if (!char_two->p.tpBasis) { |
646 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
647 | goto err; |
648 | } |
649 | |
650 | tmp_long = ASN1_INTEGER_get(char_two->p.tpBasis); |
651 | |
652 | if (!(char_two->m > tmp_long && tmp_long > 0)) { |
653 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, |
654 | EC_R_INVALID_TRINOMIAL_BASIS); |
655 | goto err; |
656 | } |
657 | |
658 | /* create the polynomial */ |
659 | if (!BN_set_bit(p, (int)char_two->m)) |
660 | goto err; |
661 | if (!BN_set_bit(p, (int)tmp_long)) |
662 | goto err; |
663 | if (!BN_set_bit(p, 0)) |
664 | goto err; |
665 | } else if (tmp == NID_X9_62_ppBasis) { |
666 | X9_62_PENTANOMIAL *penta; |
667 | |
668 | penta = char_two->p.ppBasis; |
669 | if (penta == NULL) { |
670 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
671 | goto err; |
672 | } |
673 | |
674 | if (! |
675 | (char_two->m > penta->k3 && penta->k3 > penta->k2 |
676 | && penta->k2 > penta->k1 && penta->k1 > 0)) { |
677 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, |
678 | EC_R_INVALID_PENTANOMIAL_BASIS); |
679 | goto err; |
680 | } |
681 | |
682 | /* create the polynomial */ |
683 | if (!BN_set_bit(p, (int)char_two->m)) |
684 | goto err; |
685 | if (!BN_set_bit(p, (int)penta->k1)) |
686 | goto err; |
687 | if (!BN_set_bit(p, (int)penta->k2)) |
688 | goto err; |
689 | if (!BN_set_bit(p, (int)penta->k3)) |
690 | goto err; |
691 | if (!BN_set_bit(p, 0)) |
692 | goto err; |
693 | } else if (tmp == NID_X9_62_onBasis) { |
694 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_NOT_IMPLEMENTED); |
695 | goto err; |
696 | } else { /* error */ |
697 | |
698 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
699 | goto err; |
700 | } |
701 | |
702 | /* create the EC_GROUP structure */ |
703 | ret = EC_GROUP_new_curve_GF2m(p, a, b, NULL); |
704 | } |
705 | #endif |
706 | else if (tmp == NID_X9_62_prime_field) { |
707 | /* we have a curve over a prime field */ |
708 | /* extract the prime number */ |
709 | if (params->fieldID->p.prime == NULL) { |
710 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
711 | goto err; |
712 | } |
713 | p = ASN1_INTEGER_to_BN(params->fieldID->p.prime, NULL); |
714 | if (p == NULL) { |
715 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); |
716 | goto err; |
717 | } |
718 | |
719 | if (BN_is_negative(p) || BN_is_zero(p)) { |
720 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD); |
721 | goto err; |
722 | } |
723 | |
724 | field_bits = BN_num_bits(p); |
725 | if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { |
726 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_FIELD_TOO_LARGE); |
727 | goto err; |
728 | } |
729 | |
730 | /* create the EC_GROUP structure */ |
731 | ret = EC_GROUP_new_curve_GFp(p, a, b, NULL); |
732 | } else { |
733 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_FIELD); |
734 | goto err; |
735 | } |
736 | |
737 | if (ret == NULL) { |
738 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); |
739 | goto err; |
740 | } |
741 | |
742 | /* extract seed (optional) */ |
743 | if (params->curve->seed != NULL) { |
744 | OPENSSL_free(ret->seed); |
745 | if ((ret->seed = OPENSSL_malloc(params->curve->seed->length)) == NULL) { |
746 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_MALLOC_FAILURE); |
747 | goto err; |
748 | } |
749 | memcpy(ret->seed, params->curve->seed->data, |
750 | params->curve->seed->length); |
751 | ret->seed_len = params->curve->seed->length; |
752 | } |
753 | |
754 | if (params->order == NULL |
755 | || params->base == NULL |
756 | || params->base->data == NULL) { |
757 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_ASN1_ERROR); |
758 | goto err; |
759 | } |
760 | |
761 | if ((point = EC_POINT_new(ret)) == NULL) |
762 | goto err; |
763 | |
764 | /* set the point conversion form */ |
765 | EC_GROUP_set_point_conversion_form(ret, (point_conversion_form_t) |
766 | (params->base->data[0] & ~0x01)); |
767 | |
768 | /* extract the ec point */ |
769 | if (!EC_POINT_oct2point(ret, point, params->base->data, |
770 | params->base->length, NULL)) { |
771 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); |
772 | goto err; |
773 | } |
774 | |
775 | /* extract the order */ |
776 | if ((a = ASN1_INTEGER_to_BN(params->order, a)) == NULL) { |
777 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); |
778 | goto err; |
779 | } |
780 | if (BN_is_negative(a) || BN_is_zero(a)) { |
781 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER); |
782 | goto err; |
783 | } |
784 | if (BN_num_bits(a) > (int)field_bits + 1) { /* Hasse bound */ |
785 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, EC_R_INVALID_GROUP_ORDER); |
786 | goto err; |
787 | } |
788 | |
789 | /* extract the cofactor (optional) */ |
790 | if (params->cofactor == NULL) { |
791 | BN_free(b); |
792 | b = NULL; |
793 | } else if ((b = ASN1_INTEGER_to_BN(params->cofactor, b)) == NULL) { |
794 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_ASN1_LIB); |
795 | goto err; |
796 | } |
797 | /* set the generator, order and cofactor (if present) */ |
798 | if (!EC_GROUP_set_generator(ret, point, a, b)) { |
799 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); |
800 | goto err; |
801 | } |
802 | |
803 | /* |
804 | * Check if the explicit parameters group just created matches one of the |
805 | * built-in curves. |
806 | * |
807 | * We create a copy of the group just built, so that we can remove optional |
808 | * fields for the lookup: we do this to avoid the possibility that one of |
809 | * the optional parameters is used to force the library into using a less |
810 | * performant and less secure EC_METHOD instead of the specialized one. |
811 | * In any case, `seed` is not really used in any computation, while a |
812 | * cofactor different from the one in the built-in table is just |
813 | * mathematically wrong anyway and should not be used. |
814 | */ |
815 | if ((ctx = BN_CTX_new()) == NULL) { |
816 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_BN_LIB); |
817 | goto err; |
818 | } |
819 | if ((dup = EC_GROUP_dup(ret)) == NULL |
820 | || EC_GROUP_set_seed(dup, NULL, 0) != 1 |
821 | || !EC_GROUP_set_generator(dup, point, a, NULL)) { |
822 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); |
823 | goto err; |
824 | } |
825 | if ((curve_name = ec_curve_nid_from_params(dup, ctx)) != NID_undef) { |
826 | /* |
827 | * The input explicit parameters successfully matched one of the |
828 | * built-in curves: often for built-in curves we have specialized |
829 | * methods with better performance and hardening. |
830 | * |
831 | * In this case we replace the `EC_GROUP` created through explicit |
832 | * parameters with one created from a named group. |
833 | */ |
834 | EC_GROUP *named_group = NULL; |
835 | |
836 | #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 |
837 | /* |
838 | * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for |
839 | * the same curve, we prefer the SECP nid when matching explicit |
840 | * parameters as that is associated with a specialized EC_METHOD. |
841 | */ |
842 | if (curve_name == NID_wap_wsg_idm_ecid_wtls12) |
843 | curve_name = NID_secp224r1; |
844 | #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */ |
845 | |
846 | if ((named_group = EC_GROUP_new_by_curve_name(curve_name)) == NULL) { |
847 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS, ERR_R_EC_LIB); |
848 | goto err; |
849 | } |
850 | EC_GROUP_free(ret); |
851 | ret = named_group; |
852 | |
853 | /* |
854 | * Set the flag so that EC_GROUPs created from explicit parameters are |
855 | * serialized using explicit parameters by default. |
856 | */ |
857 | EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE); |
858 | |
859 | /* |
860 | * If the input params do not contain the optional seed field we make |
861 | * sure it is not added to the returned group. |
862 | * |
863 | * The seed field is not really used inside libcrypto anyway, and |
864 | * adding it to parsed explicit parameter keys would alter their DER |
865 | * encoding output (because of the extra field) which could impact |
866 | * applications fingerprinting keys by their DER encoding. |
867 | */ |
868 | if (params->curve->seed == NULL) { |
869 | if (EC_GROUP_set_seed(ret, NULL, 0) != 1) |
870 | goto err; |
871 | } |
872 | } |
873 | |
874 | ok = 1; |
875 | |
876 | err: |
877 | if (!ok) { |
878 | EC_GROUP_free(ret); |
879 | ret = NULL; |
880 | } |
881 | EC_GROUP_free(dup); |
882 | |
883 | BN_free(p); |
884 | BN_free(a); |
885 | BN_free(b); |
886 | EC_POINT_free(point); |
887 | |
888 | BN_CTX_free(ctx); |
889 | |
890 | return ret; |
891 | } |
892 | |
893 | EC_GROUP *EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS *params) |
894 | { |
895 | EC_GROUP *ret = NULL; |
896 | int tmp = 0; |
897 | |
898 | if (params == NULL) { |
899 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_MISSING_PARAMETERS); |
900 | return NULL; |
901 | } |
902 | |
903 | if (params->type == 0) { /* the curve is given by an OID */ |
904 | tmp = OBJ_obj2nid(params->value.named_curve); |
905 | if ((ret = EC_GROUP_new_by_curve_name(tmp)) == NULL) { |
906 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, |
907 | EC_R_EC_GROUP_NEW_BY_NAME_FAILURE); |
908 | return NULL; |
909 | } |
910 | EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_NAMED_CURVE); |
911 | } else if (params->type == 1) { /* the parameters are given by a |
912 | * ECPARAMETERS structure */ |
913 | ret = EC_GROUP_new_from_ecparameters(params->value.parameters); |
914 | if (!ret) { |
915 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, ERR_R_EC_LIB); |
916 | return NULL; |
917 | } |
918 | EC_GROUP_set_asn1_flag(ret, OPENSSL_EC_EXPLICIT_CURVE); |
919 | } else if (params->type == 2) { /* implicitlyCA */ |
920 | return NULL; |
921 | } else { |
922 | ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS, EC_R_ASN1_ERROR); |
923 | return NULL; |
924 | } |
925 | |
926 | return ret; |
927 | } |
928 | |
929 | /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */ |
930 | |
931 | EC_GROUP *d2i_ECPKParameters(EC_GROUP **a, const unsigned char **in, long len) |
932 | { |
933 | EC_GROUP *group = NULL; |
934 | ECPKPARAMETERS *params = NULL; |
935 | const unsigned char *p = *in; |
936 | |
937 | if ((params = d2i_ECPKPARAMETERS(NULL, &p, len)) == NULL) { |
938 | ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_D2I_ECPKPARAMETERS_FAILURE); |
939 | ECPKPARAMETERS_free(params); |
940 | return NULL; |
941 | } |
942 | |
943 | if ((group = EC_GROUP_new_from_ecpkparameters(params)) == NULL) { |
944 | ECerr(EC_F_D2I_ECPKPARAMETERS, EC_R_PKPARAMETERS2GROUP_FAILURE); |
945 | ECPKPARAMETERS_free(params); |
946 | return NULL; |
947 | } |
948 | |
949 | if (a) { |
950 | EC_GROUP_free(*a); |
951 | *a = group; |
952 | } |
953 | |
954 | ECPKPARAMETERS_free(params); |
955 | *in = p; |
956 | return group; |
957 | } |
958 | |
959 | int i2d_ECPKParameters(const EC_GROUP *a, unsigned char **out) |
960 | { |
961 | int ret = 0; |
962 | ECPKPARAMETERS *tmp = EC_GROUP_get_ecpkparameters(a, NULL); |
963 | if (tmp == NULL) { |
964 | ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_GROUP2PKPARAMETERS_FAILURE); |
965 | return 0; |
966 | } |
967 | if ((ret = i2d_ECPKPARAMETERS(tmp, out)) == 0) { |
968 | ECerr(EC_F_I2D_ECPKPARAMETERS, EC_R_I2D_ECPKPARAMETERS_FAILURE); |
969 | ECPKPARAMETERS_free(tmp); |
970 | return 0; |
971 | } |
972 | ECPKPARAMETERS_free(tmp); |
973 | return ret; |
974 | } |
975 | |
976 | /* some EC_KEY functions */ |
977 | |
978 | EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const unsigned char **in, long len) |
979 | { |
980 | EC_KEY *ret = NULL; |
981 | EC_PRIVATEKEY *priv_key = NULL; |
982 | const unsigned char *p = *in; |
983 | |
984 | if ((priv_key = d2i_EC_PRIVATEKEY(NULL, &p, len)) == NULL) { |
985 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
986 | return NULL; |
987 | } |
988 | |
989 | if (a == NULL || *a == NULL) { |
990 | if ((ret = EC_KEY_new()) == NULL) { |
991 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); |
992 | goto err; |
993 | } |
994 | } else |
995 | ret = *a; |
996 | |
997 | if (priv_key->parameters) { |
998 | EC_GROUP_free(ret->group); |
999 | ret->group = EC_GROUP_new_from_ecpkparameters(priv_key->parameters); |
1000 | } |
1001 | |
1002 | if (ret->group == NULL) { |
1003 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
1004 | goto err; |
1005 | } |
1006 | |
1007 | ret->version = priv_key->version; |
1008 | |
1009 | if (priv_key->privateKey) { |
1010 | ASN1_OCTET_STRING *pkey = priv_key->privateKey; |
1011 | if (EC_KEY_oct2priv(ret, ASN1_STRING_get0_data(pkey), |
1012 | ASN1_STRING_length(pkey)) == 0) |
1013 | goto err; |
1014 | } else { |
1015 | ECerr(EC_F_D2I_ECPRIVATEKEY, EC_R_MISSING_PRIVATE_KEY); |
1016 | goto err; |
1017 | } |
1018 | |
1019 | EC_POINT_clear_free(ret->pub_key); |
1020 | ret->pub_key = EC_POINT_new(ret->group); |
1021 | if (ret->pub_key == NULL) { |
1022 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
1023 | goto err; |
1024 | } |
1025 | |
1026 | if (priv_key->publicKey) { |
1027 | const unsigned char *pub_oct; |
1028 | int pub_oct_len; |
1029 | |
1030 | pub_oct = ASN1_STRING_get0_data(priv_key->publicKey); |
1031 | pub_oct_len = ASN1_STRING_length(priv_key->publicKey); |
1032 | if (!EC_KEY_oct2key(ret, pub_oct, pub_oct_len, NULL)) { |
1033 | ECerr(EC_F_D2I_ECPRIVATEKEY, ERR_R_EC_LIB); |
1034 | goto err; |
1035 | } |
1036 | } else { |
1037 | if (ret->group->meth->keygenpub == NULL |
1038 | || ret->group->meth->keygenpub(ret) == 0) |
1039 | goto err; |
1040 | /* Remember the original private-key-only encoding. */ |
1041 | ret->enc_flag |= EC_PKEY_NO_PUBKEY; |
1042 | } |
1043 | |
1044 | if (a) |
1045 | *a = ret; |
1046 | EC_PRIVATEKEY_free(priv_key); |
1047 | *in = p; |
1048 | return ret; |
1049 | |
1050 | err: |
1051 | if (a == NULL || *a != ret) |
1052 | EC_KEY_free(ret); |
1053 | EC_PRIVATEKEY_free(priv_key); |
1054 | return NULL; |
1055 | } |
1056 | |
1057 | int i2d_ECPrivateKey(const EC_KEY *a, unsigned char **out) |
1058 | { |
1059 | int ret = 0, ok = 0; |
1060 | unsigned char *priv= NULL, *pub= NULL; |
1061 | size_t privlen = 0, publen = 0; |
1062 | |
1063 | EC_PRIVATEKEY *priv_key = NULL; |
1064 | |
1065 | if (a == NULL || a->group == NULL || |
1066 | (!(a->enc_flag & EC_PKEY_NO_PUBKEY) && a->pub_key == NULL)) { |
1067 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_PASSED_NULL_PARAMETER); |
1068 | goto err; |
1069 | } |
1070 | |
1071 | if ((priv_key = EC_PRIVATEKEY_new()) == NULL) { |
1072 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); |
1073 | goto err; |
1074 | } |
1075 | |
1076 | priv_key->version = a->version; |
1077 | |
1078 | privlen = EC_KEY_priv2buf(a, &priv); |
1079 | |
1080 | if (privlen == 0) { |
1081 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
1082 | goto err; |
1083 | } |
1084 | |
1085 | ASN1_STRING_set0(priv_key->privateKey, priv, privlen); |
1086 | priv = NULL; |
1087 | |
1088 | if (!(a->enc_flag & EC_PKEY_NO_PARAMETERS)) { |
1089 | if ((priv_key->parameters = |
1090 | EC_GROUP_get_ecpkparameters(a->group, |
1091 | priv_key->parameters)) == NULL) { |
1092 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
1093 | goto err; |
1094 | } |
1095 | } |
1096 | |
1097 | if (!(a->enc_flag & EC_PKEY_NO_PUBKEY)) { |
1098 | priv_key->publicKey = ASN1_BIT_STRING_new(); |
1099 | if (priv_key->publicKey == NULL) { |
1100 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_MALLOC_FAILURE); |
1101 | goto err; |
1102 | } |
1103 | |
1104 | publen = EC_KEY_key2buf(a, a->conv_form, &pub, NULL); |
1105 | |
1106 | if (publen == 0) { |
1107 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
1108 | goto err; |
1109 | } |
1110 | |
1111 | priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); |
1112 | priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT; |
1113 | ASN1_STRING_set0(priv_key->publicKey, pub, publen); |
1114 | pub = NULL; |
1115 | } |
1116 | |
1117 | if ((ret = i2d_EC_PRIVATEKEY(priv_key, out)) == 0) { |
1118 | ECerr(EC_F_I2D_ECPRIVATEKEY, ERR_R_EC_LIB); |
1119 | goto err; |
1120 | } |
1121 | ok = 1; |
1122 | err: |
1123 | OPENSSL_clear_free(priv, privlen); |
1124 | OPENSSL_free(pub); |
1125 | EC_PRIVATEKEY_free(priv_key); |
1126 | return (ok ? ret : 0); |
1127 | } |
1128 | |
1129 | int i2d_ECParameters(const EC_KEY *a, unsigned char **out) |
1130 | { |
1131 | if (a == NULL) { |
1132 | ECerr(EC_F_I2D_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); |
1133 | return 0; |
1134 | } |
1135 | return i2d_ECPKParameters(a->group, out); |
1136 | } |
1137 | |
1138 | EC_KEY *d2i_ECParameters(EC_KEY **a, const unsigned char **in, long len) |
1139 | { |
1140 | EC_KEY *ret; |
1141 | |
1142 | if (in == NULL || *in == NULL) { |
1143 | ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_PASSED_NULL_PARAMETER); |
1144 | return NULL; |
1145 | } |
1146 | |
1147 | if (a == NULL || *a == NULL) { |
1148 | if ((ret = EC_KEY_new()) == NULL) { |
1149 | ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_MALLOC_FAILURE); |
1150 | return NULL; |
1151 | } |
1152 | } else |
1153 | ret = *a; |
1154 | |
1155 | if (!d2i_ECPKParameters(&ret->group, in, len)) { |
1156 | ECerr(EC_F_D2I_ECPARAMETERS, ERR_R_EC_LIB); |
1157 | if (a == NULL || *a != ret) |
1158 | EC_KEY_free(ret); |
1159 | return NULL; |
1160 | } |
1161 | |
1162 | if (a) |
1163 | *a = ret; |
1164 | |
1165 | return ret; |
1166 | } |
1167 | |
1168 | EC_KEY *o2i_ECPublicKey(EC_KEY **a, const unsigned char **in, long len) |
1169 | { |
1170 | EC_KEY *ret = NULL; |
1171 | |
1172 | if (a == NULL || (*a) == NULL || (*a)->group == NULL) { |
1173 | /* |
1174 | * sorry, but a EC_GROUP-structure is necessary to set the public key |
1175 | */ |
1176 | ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); |
1177 | return 0; |
1178 | } |
1179 | ret = *a; |
1180 | if (!EC_KEY_oct2key(ret, *in, len, NULL)) { |
1181 | ECerr(EC_F_O2I_ECPUBLICKEY, ERR_R_EC_LIB); |
1182 | return 0; |
1183 | } |
1184 | *in += len; |
1185 | return ret; |
1186 | } |
1187 | |
1188 | int i2o_ECPublicKey(const EC_KEY *a, unsigned char **out) |
1189 | { |
1190 | size_t buf_len = 0; |
1191 | int new_buffer = 0; |
1192 | |
1193 | if (a == NULL) { |
1194 | ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_PASSED_NULL_PARAMETER); |
1195 | return 0; |
1196 | } |
1197 | |
1198 | buf_len = EC_POINT_point2oct(a->group, a->pub_key, |
1199 | a->conv_form, NULL, 0, NULL); |
1200 | |
1201 | if (out == NULL || buf_len == 0) |
1202 | /* out == NULL => just return the length of the octet string */ |
1203 | return buf_len; |
1204 | |
1205 | if (*out == NULL) { |
1206 | if ((*out = OPENSSL_malloc(buf_len)) == NULL) { |
1207 | ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_MALLOC_FAILURE); |
1208 | return 0; |
1209 | } |
1210 | new_buffer = 1; |
1211 | } |
1212 | if (!EC_POINT_point2oct(a->group, a->pub_key, a->conv_form, |
1213 | *out, buf_len, NULL)) { |
1214 | ECerr(EC_F_I2O_ECPUBLICKEY, ERR_R_EC_LIB); |
1215 | if (new_buffer) { |
1216 | OPENSSL_free(*out); |
1217 | *out = NULL; |
1218 | } |
1219 | return 0; |
1220 | } |
1221 | if (!new_buffer) |
1222 | *out += buf_len; |
1223 | return buf_len; |
1224 | } |
1225 | |
1226 | DECLARE_ASN1_FUNCTIONS(ECDSA_SIG) |
1227 | DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG, ECDSA_SIG) |
1228 | |
1229 | #endif /* FIPS_MODE */ |
1230 | |
1231 | ECDSA_SIG *ECDSA_SIG_new(void) |
1232 | { |
1233 | ECDSA_SIG *sig = OPENSSL_zalloc(sizeof(*sig)); |
1234 | if (sig == NULL) |
1235 | ECerr(EC_F_ECDSA_SIG_NEW, ERR_R_MALLOC_FAILURE); |
1236 | return sig; |
1237 | } |
1238 | |
1239 | void ECDSA_SIG_free(ECDSA_SIG *sig) |
1240 | { |
1241 | if (sig == NULL) |
1242 | return; |
1243 | BN_clear_free(sig->r); |
1244 | BN_clear_free(sig->s); |
1245 | OPENSSL_free(sig); |
1246 | } |
1247 | |
1248 | ECDSA_SIG *d2i_ECDSA_SIG(ECDSA_SIG **psig, const unsigned char **ppin, long len) |
1249 | { |
1250 | ECDSA_SIG *sig; |
1251 | |
1252 | if (len < 0) |
1253 | return NULL; |
1254 | if (psig != NULL && *psig != NULL) { |
1255 | sig = *psig; |
1256 | } else { |
1257 | sig = ECDSA_SIG_new(); |
1258 | if (sig == NULL) |
1259 | return NULL; |
1260 | } |
1261 | if (sig->r == NULL) |
1262 | sig->r = BN_new(); |
1263 | if (sig->s == NULL) |
1264 | sig->s = BN_new(); |
1265 | if (decode_der_dsa_sig(sig->r, sig->s, ppin, (size_t)len) == 0) { |
1266 | if (psig == NULL || *psig == NULL) |
1267 | ECDSA_SIG_free(sig); |
1268 | return NULL; |
1269 | } |
1270 | if (psig != NULL && *psig == NULL) |
1271 | *psig = sig; |
1272 | return sig; |
1273 | } |
1274 | |
1275 | int i2d_ECDSA_SIG(const ECDSA_SIG *sig, unsigned char **ppout) |
1276 | { |
1277 | BUF_MEM *buf = NULL; |
1278 | size_t encoded_len; |
1279 | WPACKET pkt; |
1280 | |
1281 | if (ppout == NULL) { |
1282 | if (!WPACKET_init_null(&pkt, 0)) |
1283 | return -1; |
1284 | } else if (*ppout == NULL) { |
1285 | if ((buf = BUF_MEM_new()) == NULL |
1286 | || !WPACKET_init_len(&pkt, buf, 0)) { |
1287 | BUF_MEM_free(buf); |
1288 | return -1; |
1289 | } |
1290 | } else { |
1291 | if (!WPACKET_init_static_len(&pkt, *ppout, SIZE_MAX, 0)) |
1292 | return -1; |
1293 | } |
1294 | |
1295 | if (!encode_der_dsa_sig(&pkt, sig->r, sig->s) |
1296 | || !WPACKET_get_total_written(&pkt, &encoded_len) |
1297 | || !WPACKET_finish(&pkt)) { |
1298 | BUF_MEM_free(buf); |
1299 | WPACKET_cleanup(&pkt); |
1300 | return -1; |
1301 | } |
1302 | |
1303 | if (ppout != NULL) { |
1304 | if (*ppout == NULL) { |
1305 | *ppout = (unsigned char *)buf->data; |
1306 | buf->data = NULL; |
1307 | BUF_MEM_free(buf); |
1308 | } else { |
1309 | *ppout += encoded_len; |
1310 | } |
1311 | } |
1312 | |
1313 | return (int)encoded_len; |
1314 | } |
1315 | |
1316 | void ECDSA_SIG_get0(const ECDSA_SIG *sig, const BIGNUM **pr, const BIGNUM **ps) |
1317 | { |
1318 | if (pr != NULL) |
1319 | *pr = sig->r; |
1320 | if (ps != NULL) |
1321 | *ps = sig->s; |
1322 | } |
1323 | |
1324 | const BIGNUM *ECDSA_SIG_get0_r(const ECDSA_SIG *sig) |
1325 | { |
1326 | return sig->r; |
1327 | } |
1328 | |
1329 | const BIGNUM *ECDSA_SIG_get0_s(const ECDSA_SIG *sig) |
1330 | { |
1331 | return sig->s; |
1332 | } |
1333 | |
1334 | int ECDSA_SIG_set0(ECDSA_SIG *sig, BIGNUM *r, BIGNUM *s) |
1335 | { |
1336 | if (r == NULL || s == NULL) |
1337 | return 0; |
1338 | BN_clear_free(sig->r); |
1339 | BN_clear_free(sig->s); |
1340 | sig->r = r; |
1341 | sig->s = s; |
1342 | return 1; |
1343 | } |
1344 | |
1345 | #ifndef FIPS_MODE |
1346 | int ECDSA_size(const EC_KEY *r) |
1347 | { |
1348 | int ret, i; |
1349 | ASN1_INTEGER bs; |
1350 | unsigned char buf[4]; |
1351 | const EC_GROUP *group; |
1352 | |
1353 | if (r == NULL) |
1354 | return 0; |
1355 | group = EC_KEY_get0_group(r); |
1356 | if (group == NULL) |
1357 | return 0; |
1358 | |
1359 | i = EC_GROUP_order_bits(group); |
1360 | if (i == 0) |
1361 | return 0; |
1362 | bs.length = (i + 7) / 8; |
1363 | bs.data = buf; |
1364 | bs.type = V_ASN1_INTEGER; |
1365 | /* If the top bit is set the asn1 encoding is 1 larger. */ |
1366 | buf[0] = 0xff; |
1367 | |
1368 | i = i2d_ASN1_INTEGER(&bs, NULL); |
1369 | i += i; /* r and s */ |
1370 | ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); |
1371 | return ret; |
1372 | } |
1373 | #endif |
1374 | |