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Commit | Line | Data |
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35b73a1f | 1 | /* |
3c7d0945 | 2 | * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved. |
aa8f3d76 | 3 | * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved |
65e81670 | 4 | * |
a7f182b7 | 5 | * Licensed under the Apache License 2.0 (the "License"). You may not use |
aa6bb135 RS |
6 | * this file except in compliance with the License. You can obtain a copy |
7 | * in the file LICENSE in the source distribution or at | |
8 | * https://www.openssl.org/source/license.html | |
65e81670 | 9 | */ |
aa6bb135 | 10 | |
c4b36ff4 BM |
11 | #include <string.h> |
12 | ||
0657bf9c | 13 | #include <openssl/err.h> |
bb62a8b0 | 14 | #include <openssl/opensslv.h> |
0657bf9c | 15 | |
65e81670 | 16 | #include "ec_lcl.h" |
0657bf9c | 17 | |
0657bf9c BM |
18 | /* functions for EC_GROUP objects */ |
19 | ||
a9612d6c | 20 | EC_GROUP *EC_GROUP_new_ex(OPENSSL_CTX *libctx, const EC_METHOD *meth) |
0f113f3e MC |
21 | { |
22 | EC_GROUP *ret; | |
23 | ||
24 | if (meth == NULL) { | |
a9612d6c | 25 | ECerr(EC_F_EC_GROUP_NEW_EX, EC_R_SLOT_FULL); |
0f113f3e MC |
26 | return NULL; |
27 | } | |
28 | if (meth->group_init == 0) { | |
a9612d6c | 29 | ECerr(EC_F_EC_GROUP_NEW_EX, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
30 | return NULL; |
31 | } | |
32 | ||
64b25758 | 33 | ret = OPENSSL_zalloc(sizeof(*ret)); |
0f113f3e | 34 | if (ret == NULL) { |
a9612d6c | 35 | ECerr(EC_F_EC_GROUP_NEW_EX, ERR_R_MALLOC_FAILURE); |
0f113f3e MC |
36 | return NULL; |
37 | } | |
38 | ||
a9612d6c | 39 | ret->libctx = libctx; |
0f113f3e | 40 | ret->meth = meth; |
6903e2e7 DSH |
41 | if ((ret->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) { |
42 | ret->order = BN_new(); | |
43 | if (ret->order == NULL) | |
44 | goto err; | |
45 | ret->cofactor = BN_new(); | |
46 | if (ret->cofactor == NULL) | |
47 | goto err; | |
48 | } | |
86f300d3 | 49 | ret->asn1_flag = OPENSSL_EC_NAMED_CURVE; |
0f113f3e | 50 | ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED; |
0f113f3e MC |
51 | if (!meth->group_init(ret)) |
52 | goto err; | |
0f113f3e | 53 | return ret; |
64b25758 | 54 | |
0f113f3e | 55 | err: |
23a1d5e9 RS |
56 | BN_free(ret->order); |
57 | BN_free(ret->cofactor); | |
0f113f3e MC |
58 | OPENSSL_free(ret); |
59 | return NULL; | |
60 | } | |
0657bf9c | 61 | |
a9612d6c MC |
62 | #ifndef FIPS_MODE |
63 | EC_GROUP *EC_GROUP_new(const EC_METHOD *meth) | |
64 | { | |
65 | return EC_GROUP_new_ex(NULL, meth); | |
66 | } | |
67 | #endif | |
68 | ||
2c52ac9b | 69 | void EC_pre_comp_free(EC_GROUP *group) |
3aef36ff RS |
70 | { |
71 | switch (group->pre_comp_type) { | |
f3b3d7f0 | 72 | case PCT_none: |
3aef36ff | 73 | break; |
66117ab0 | 74 | case PCT_nistz256: |
f3b3d7f0 | 75 | #ifdef ECP_NISTZ256_ASM |
3aef36ff | 76 | EC_nistz256_pre_comp_free(group->pre_comp.nistz256); |
e69aa800 | 77 | #endif |
f3b3d7f0 | 78 | break; |
3aef36ff | 79 | #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 |
66117ab0 | 80 | case PCT_nistp224: |
3aef36ff RS |
81 | EC_nistp224_pre_comp_free(group->pre_comp.nistp224); |
82 | break; | |
66117ab0 | 83 | case PCT_nistp256: |
3aef36ff RS |
84 | EC_nistp256_pre_comp_free(group->pre_comp.nistp256); |
85 | break; | |
66117ab0 | 86 | case PCT_nistp521: |
3aef36ff RS |
87 | EC_nistp521_pre_comp_free(group->pre_comp.nistp521); |
88 | break; | |
f3b3d7f0 RS |
89 | #else |
90 | case PCT_nistp224: | |
91 | case PCT_nistp256: | |
92 | case PCT_nistp521: | |
93 | break; | |
3aef36ff | 94 | #endif |
66117ab0 | 95 | case PCT_ec: |
3aef36ff RS |
96 | EC_ec_pre_comp_free(group->pre_comp.ec); |
97 | break; | |
98 | } | |
99 | group->pre_comp.ec = NULL; | |
100 | } | |
101 | ||
0657bf9c | 102 | void EC_GROUP_free(EC_GROUP *group) |
0f113f3e MC |
103 | { |
104 | if (!group) | |
105 | return; | |
7711de24 | 106 | |
0f113f3e MC |
107 | if (group->meth->group_finish != 0) |
108 | group->meth->group_finish(group); | |
df9cc153 | 109 | |
2c52ac9b | 110 | EC_pre_comp_free(group); |
23a1d5e9 | 111 | BN_MONT_CTX_free(group->mont_data); |
8fdc3734 | 112 | EC_POINT_free(group->generator); |
0f113f3e MC |
113 | BN_free(group->order); |
114 | BN_free(group->cofactor); | |
25aaa98a | 115 | OPENSSL_free(group->seed); |
0f113f3e MC |
116 | OPENSSL_free(group); |
117 | } | |
0657bf9c BM |
118 | |
119 | void EC_GROUP_clear_free(EC_GROUP *group) | |
0f113f3e MC |
120 | { |
121 | if (!group) | |
122 | return; | |
df9cc153 | 123 | |
0f113f3e MC |
124 | if (group->meth->group_clear_finish != 0) |
125 | group->meth->group_clear_finish(group); | |
126 | else if (group->meth->group_finish != 0) | |
127 | group->meth->group_finish(group); | |
df9cc153 | 128 | |
2c52ac9b | 129 | EC_pre_comp_free(group); |
23a1d5e9 | 130 | BN_MONT_CTX_free(group->mont_data); |
8fdc3734 | 131 | EC_POINT_clear_free(group->generator); |
0f113f3e MC |
132 | BN_clear_free(group->order); |
133 | BN_clear_free(group->cofactor); | |
4b45c6e5 | 134 | OPENSSL_clear_free(group->seed, group->seed_len); |
b4faea50 | 135 | OPENSSL_clear_free(group, sizeof(*group)); |
0f113f3e | 136 | } |
0657bf9c BM |
137 | |
138 | int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src) | |
0f113f3e | 139 | { |
0f113f3e MC |
140 | if (dest->meth->group_copy == 0) { |
141 | ECerr(EC_F_EC_GROUP_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
142 | return 0; | |
143 | } | |
144 | if (dest->meth != src->meth) { | |
145 | ECerr(EC_F_EC_GROUP_COPY, EC_R_INCOMPATIBLE_OBJECTS); | |
146 | return 0; | |
147 | } | |
148 | if (dest == src) | |
149 | return 1; | |
150 | ||
a9612d6c | 151 | dest->libctx = src->libctx; |
b14e6015 MC |
152 | dest->curve_name = src->curve_name; |
153 | ||
3aef36ff RS |
154 | /* Copy precomputed */ |
155 | dest->pre_comp_type = src->pre_comp_type; | |
156 | switch (src->pre_comp_type) { | |
f3b3d7f0 | 157 | case PCT_none: |
3aef36ff RS |
158 | dest->pre_comp.ec = NULL; |
159 | break; | |
66117ab0 | 160 | case PCT_nistz256: |
f3b3d7f0 | 161 | #ifdef ECP_NISTZ256_ASM |
3aef36ff | 162 | dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256); |
e69aa800 | 163 | #endif |
f3b3d7f0 | 164 | break; |
3aef36ff | 165 | #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 |
66117ab0 | 166 | case PCT_nistp224: |
3aef36ff RS |
167 | dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224); |
168 | break; | |
66117ab0 | 169 | case PCT_nistp256: |
3aef36ff RS |
170 | dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256); |
171 | break; | |
66117ab0 | 172 | case PCT_nistp521: |
3aef36ff RS |
173 | dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521); |
174 | break; | |
f3b3d7f0 RS |
175 | #else |
176 | case PCT_nistp224: | |
177 | case PCT_nistp256: | |
178 | case PCT_nistp521: | |
179 | break; | |
3aef36ff | 180 | #endif |
66117ab0 | 181 | case PCT_ec: |
3aef36ff RS |
182 | dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec); |
183 | break; | |
0f113f3e MC |
184 | } |
185 | ||
186 | if (src->mont_data != NULL) { | |
187 | if (dest->mont_data == NULL) { | |
188 | dest->mont_data = BN_MONT_CTX_new(); | |
189 | if (dest->mont_data == NULL) | |
190 | return 0; | |
191 | } | |
192 | if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data)) | |
193 | return 0; | |
194 | } else { | |
195 | /* src->generator == NULL */ | |
23a1d5e9 RS |
196 | BN_MONT_CTX_free(dest->mont_data); |
197 | dest->mont_data = NULL; | |
0f113f3e | 198 | } |
0657bf9c | 199 | |
0f113f3e MC |
200 | if (src->generator != NULL) { |
201 | if (dest->generator == NULL) { | |
202 | dest->generator = EC_POINT_new(dest); | |
203 | if (dest->generator == NULL) | |
204 | return 0; | |
205 | } | |
206 | if (!EC_POINT_copy(dest->generator, src->generator)) | |
207 | return 0; | |
208 | } else { | |
209 | /* src->generator == NULL */ | |
8fdc3734 RS |
210 | EC_POINT_clear_free(dest->generator); |
211 | dest->generator = NULL; | |
0f113f3e MC |
212 | } |
213 | ||
6903e2e7 DSH |
214 | if ((src->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) { |
215 | if (!BN_copy(dest->order, src->order)) | |
216 | return 0; | |
217 | if (!BN_copy(dest->cofactor, src->cofactor)) | |
218 | return 0; | |
219 | } | |
0f113f3e | 220 | |
0f113f3e MC |
221 | dest->asn1_flag = src->asn1_flag; |
222 | dest->asn1_form = src->asn1_form; | |
223 | ||
224 | if (src->seed) { | |
b548a1f1 | 225 | OPENSSL_free(dest->seed); |
cdb10bae RS |
226 | if ((dest->seed = OPENSSL_malloc(src->seed_len)) == NULL) { |
227 | ECerr(EC_F_EC_GROUP_COPY, ERR_R_MALLOC_FAILURE); | |
0f113f3e | 228 | return 0; |
cdb10bae | 229 | } |
0f113f3e MC |
230 | if (!memcpy(dest->seed, src->seed, src->seed_len)) |
231 | return 0; | |
232 | dest->seed_len = src->seed_len; | |
233 | } else { | |
b548a1f1 | 234 | OPENSSL_free(dest->seed); |
0f113f3e MC |
235 | dest->seed = NULL; |
236 | dest->seed_len = 0; | |
237 | } | |
238 | ||
239 | return dest->meth->group_copy(dest, src); | |
240 | } | |
0657bf9c | 241 | |
7793f30e | 242 | EC_GROUP *EC_GROUP_dup(const EC_GROUP *a) |
0f113f3e MC |
243 | { |
244 | EC_GROUP *t = NULL; | |
245 | int ok = 0; | |
7793f30e | 246 | |
0f113f3e MC |
247 | if (a == NULL) |
248 | return NULL; | |
7793f30e | 249 | |
a9612d6c | 250 | if ((t = EC_GROUP_new_ex(a->libctx, a->meth)) == NULL) |
26a7d938 | 251 | return NULL; |
0f113f3e MC |
252 | if (!EC_GROUP_copy(t, a)) |
253 | goto err; | |
7793f30e | 254 | |
0f113f3e | 255 | ok = 1; |
7793f30e | 256 | |
0f113f3e MC |
257 | err: |
258 | if (!ok) { | |
8fdc3734 | 259 | EC_GROUP_free(t); |
0f113f3e | 260 | return NULL; |
8fdc3734 | 261 | } |
0f113f3e MC |
262 | return t; |
263 | } | |
7793f30e | 264 | |
48fe4d62 | 265 | const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group) |
0f113f3e MC |
266 | { |
267 | return group->meth; | |
268 | } | |
48fe4d62 | 269 | |
458c2917 | 270 | int EC_METHOD_get_field_type(const EC_METHOD *meth) |
0f113f3e MC |
271 | { |
272 | return meth->field_type; | |
273 | } | |
274 | ||
eb791696 AP |
275 | static int ec_precompute_mont_data(EC_GROUP *); |
276 | ||
0f113f3e MC |
277 | int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, |
278 | const BIGNUM *order, const BIGNUM *cofactor) | |
279 | { | |
280 | if (generator == NULL) { | |
281 | ECerr(EC_F_EC_GROUP_SET_GENERATOR, ERR_R_PASSED_NULL_PARAMETER); | |
282 | return 0; | |
283 | } | |
284 | ||
285 | if (group->generator == NULL) { | |
286 | group->generator = EC_POINT_new(group); | |
287 | if (group->generator == NULL) | |
288 | return 0; | |
289 | } | |
290 | if (!EC_POINT_copy(group->generator, generator)) | |
291 | return 0; | |
292 | ||
293 | if (order != NULL) { | |
294 | if (!BN_copy(group->order, order)) | |
295 | return 0; | |
8402cd5f | 296 | } else { |
0f113f3e | 297 | BN_zero(group->order); |
8402cd5f | 298 | } |
0f113f3e | 299 | |
8402cd5f | 300 | /* The cofactor is an optional field, so it should be able to be NULL. */ |
0f113f3e MC |
301 | if (cofactor != NULL) { |
302 | if (!BN_copy(group->cofactor, cofactor)) | |
303 | return 0; | |
8402cd5f | 304 | } else { |
0f113f3e | 305 | BN_zero(group->cofactor); |
8402cd5f | 306 | } |
0f113f3e | 307 | /* |
3a6a4a93 | 308 | * Some groups have an order with |
0f113f3e MC |
309 | * factors of two, which makes the Montgomery setup fail. |
310 | * |group->mont_data| will be NULL in this case. | |
311 | */ | |
3a6a4a93 BB |
312 | if (BN_is_odd(group->order)) { |
313 | return ec_precompute_mont_data(group); | |
314 | } | |
0f113f3e | 315 | |
3a6a4a93 BB |
316 | BN_MONT_CTX_free(group->mont_data); |
317 | group->mont_data = NULL; | |
0f113f3e MC |
318 | return 1; |
319 | } | |
bb62a8b0 | 320 | |
9dd84053 | 321 | const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group) |
0f113f3e MC |
322 | { |
323 | return group->generator; | |
324 | } | |
bb62a8b0 | 325 | |
f54be179 | 326 | BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group) |
0f113f3e MC |
327 | { |
328 | return group->mont_data; | |
329 | } | |
bb62a8b0 | 330 | |
b6db386f | 331 | int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx) |
0f113f3e | 332 | { |
be2e334f DSH |
333 | if (group->order == NULL) |
334 | return 0; | |
0f113f3e MC |
335 | if (!BN_copy(order, group->order)) |
336 | return 0; | |
0657bf9c | 337 | |
0f113f3e MC |
338 | return !BN_is_zero(order); |
339 | } | |
0657bf9c | 340 | |
be2e334f DSH |
341 | const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group) |
342 | { | |
343 | return group->order; | |
344 | } | |
345 | ||
346 | int EC_GROUP_order_bits(const EC_GROUP *group) | |
347 | { | |
77470e98 | 348 | return group->meth->group_order_bits(group); |
be2e334f DSH |
349 | } |
350 | ||
0f113f3e MC |
351 | int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, |
352 | BN_CTX *ctx) | |
353 | { | |
be2e334f DSH |
354 | |
355 | if (group->cofactor == NULL) | |
356 | return 0; | |
0f113f3e MC |
357 | if (!BN_copy(cofactor, group->cofactor)) |
358 | return 0; | |
48fe4d62 | 359 | |
0f113f3e MC |
360 | return !BN_is_zero(group->cofactor); |
361 | } | |
48fe4d62 | 362 | |
be2e334f DSH |
363 | const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group) |
364 | { | |
365 | return group->cofactor; | |
366 | } | |
367 | ||
7dc17a6c | 368 | void EC_GROUP_set_curve_name(EC_GROUP *group, int nid) |
0f113f3e MC |
369 | { |
370 | group->curve_name = nid; | |
371 | } | |
b6db386f | 372 | |
7dc17a6c | 373 | int EC_GROUP_get_curve_name(const EC_GROUP *group) |
0f113f3e MC |
374 | { |
375 | return group->curve_name; | |
376 | } | |
b6db386f | 377 | |
fa1f0306 DA |
378 | const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group) |
379 | { | |
380 | return group->field; | |
381 | } | |
382 | ||
458c2917 | 383 | void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag) |
0f113f3e MC |
384 | { |
385 | group->asn1_flag = flag; | |
386 | } | |
458c2917 BM |
387 | |
388 | int EC_GROUP_get_asn1_flag(const EC_GROUP *group) | |
0f113f3e MC |
389 | { |
390 | return group->asn1_flag; | |
391 | } | |
458c2917 | 392 | |
0f113f3e | 393 | void EC_GROUP_set_point_conversion_form(EC_GROUP *group, |
254ef80d | 394 | point_conversion_form_t form) |
0f113f3e MC |
395 | { |
396 | group->asn1_form = form; | |
397 | } | |
254ef80d | 398 | |
0f113f3e MC |
399 | point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP |
400 | *group) | |
401 | { | |
402 | return group->asn1_form; | |
403 | } | |
254ef80d | 404 | |
5f3d6f70 | 405 | size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len) |
0f113f3e | 406 | { |
b548a1f1 RS |
407 | OPENSSL_free(group->seed); |
408 | group->seed = NULL; | |
409 | group->seed_len = 0; | |
5f3d6f70 | 410 | |
0f113f3e MC |
411 | if (!len || !p) |
412 | return 1; | |
5f3d6f70 | 413 | |
f06080cb F |
414 | if ((group->seed = OPENSSL_malloc(len)) == NULL) { |
415 | ECerr(EC_F_EC_GROUP_SET_SEED, ERR_R_MALLOC_FAILURE); | |
0f113f3e | 416 | return 0; |
f06080cb | 417 | } |
0f113f3e MC |
418 | memcpy(group->seed, p, len); |
419 | group->seed_len = len; | |
5f3d6f70 | 420 | |
0f113f3e MC |
421 | return len; |
422 | } | |
5f3d6f70 BM |
423 | |
424 | unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group) | |
0f113f3e MC |
425 | { |
426 | return group->seed; | |
427 | } | |
5f3d6f70 BM |
428 | |
429 | size_t EC_GROUP_get_seed_len(const EC_GROUP *group) | |
0f113f3e MC |
430 | { |
431 | return group->seed_len; | |
432 | } | |
433 | ||
8e3cced7 MC |
434 | int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
435 | const BIGNUM *b, BN_CTX *ctx) | |
0f113f3e MC |
436 | { |
437 | if (group->meth->group_set_curve == 0) { | |
8e3cced7 | 438 | ECerr(EC_F_EC_GROUP_SET_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
439 | return 0; |
440 | } | |
441 | return group->meth->group_set_curve(group, p, a, b, ctx); | |
442 | } | |
443 | ||
8e3cced7 MC |
444 | int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, |
445 | BN_CTX *ctx) | |
0f113f3e | 446 | { |
8e3cced7 MC |
447 | if (group->meth->group_get_curve == NULL) { |
448 | ECerr(EC_F_EC_GROUP_GET_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
0f113f3e MC |
449 | return 0; |
450 | } | |
451 | return group->meth->group_get_curve(group, p, a, b, ctx); | |
452 | } | |
7793f30e | 453 | |
fcd2d5a6 | 454 | #if !OPENSSL_API_3 |
8e3cced7 MC |
455 | int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
456 | const BIGNUM *b, BN_CTX *ctx) | |
457 | { | |
458 | return EC_GROUP_set_curve(group, p, a, b, ctx); | |
459 | } | |
460 | ||
461 | int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
462 | BIGNUM *b, BN_CTX *ctx) | |
463 | { | |
464 | return EC_GROUP_get_curve(group, p, a, b, ctx); | |
465 | } | |
466 | ||
50db8163 | 467 | # ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
468 | int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
469 | const BIGNUM *b, BN_CTX *ctx) | |
470 | { | |
8e3cced7 | 471 | return EC_GROUP_set_curve(group, p, a, b, ctx); |
0f113f3e MC |
472 | } |
473 | ||
474 | int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
475 | BIGNUM *b, BN_CTX *ctx) | |
476 | { | |
8e3cced7 | 477 | return EC_GROUP_get_curve(group, p, a, b, ctx); |
0f113f3e | 478 | } |
50db8163 | 479 | # endif |
b3310161 | 480 | #endif |
7793f30e BM |
481 | |
482 | int EC_GROUP_get_degree(const EC_GROUP *group) | |
0f113f3e MC |
483 | { |
484 | if (group->meth->group_get_degree == 0) { | |
485 | ECerr(EC_F_EC_GROUP_GET_DEGREE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
486 | return 0; | |
487 | } | |
488 | return group->meth->group_get_degree(group); | |
489 | } | |
48fe4d62 | 490 | |
17d6bb81 | 491 | int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx) |
0f113f3e MC |
492 | { |
493 | if (group->meth->group_check_discriminant == 0) { | |
494 | ECerr(EC_F_EC_GROUP_CHECK_DISCRIMINANT, | |
495 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
496 | return 0; | |
497 | } | |
498 | return group->meth->group_check_discriminant(group, ctx); | |
499 | } | |
af28dd6c | 500 | |
ada0e717 | 501 | int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx) |
0f113f3e MC |
502 | { |
503 | int r = 0; | |
504 | BIGNUM *a1, *a2, *a3, *b1, *b2, *b3; | |
a9612d6c | 505 | #ifndef FIPS_MODE |
0f113f3e MC |
506 | BN_CTX *ctx_new = NULL; |
507 | ||
a9612d6c MC |
508 | if (ctx == NULL) |
509 | ctx_new = ctx = BN_CTX_new(); | |
510 | #endif | |
511 | if (ctx == NULL) | |
512 | return -1; | |
513 | ||
0f113f3e MC |
514 | /* compare the field types */ |
515 | if (EC_METHOD_get_field_type(EC_GROUP_method_of(a)) != | |
516 | EC_METHOD_get_field_type(EC_GROUP_method_of(b))) | |
517 | return 1; | |
518 | /* compare the curve name (if present in both) */ | |
519 | if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) && | |
520 | EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b)) | |
521 | return 1; | |
6903e2e7 DSH |
522 | if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE) |
523 | return 0; | |
0f113f3e | 524 | |
0f113f3e MC |
525 | BN_CTX_start(ctx); |
526 | a1 = BN_CTX_get(ctx); | |
527 | a2 = BN_CTX_get(ctx); | |
528 | a3 = BN_CTX_get(ctx); | |
529 | b1 = BN_CTX_get(ctx); | |
530 | b2 = BN_CTX_get(ctx); | |
531 | b3 = BN_CTX_get(ctx); | |
90945fa3 | 532 | if (b3 == NULL) { |
0f113f3e | 533 | BN_CTX_end(ctx); |
a9612d6c | 534 | #ifndef FIPS_MODE |
23a1d5e9 | 535 | BN_CTX_free(ctx_new); |
a9612d6c | 536 | #endif |
0f113f3e MC |
537 | return -1; |
538 | } | |
539 | ||
540 | /* | |
541 | * XXX This approach assumes that the external representation of curves | |
542 | * over the same field type is the same. | |
543 | */ | |
544 | if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) || | |
545 | !b->meth->group_get_curve(b, b1, b2, b3, ctx)) | |
546 | r = 1; | |
547 | ||
8402cd5f SL |
548 | /* return 1 if the curve parameters are different */ |
549 | if (r || BN_cmp(a1, b1) != 0 || BN_cmp(a2, b2) != 0 || BN_cmp(a3, b3) != 0) | |
0f113f3e MC |
550 | r = 1; |
551 | ||
ac2b52c6 | 552 | /* XXX EC_POINT_cmp() assumes that the methods are equal */ |
8402cd5f | 553 | /* return 1 if the generators are different */ |
0f113f3e | 554 | if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a), |
8402cd5f | 555 | EC_GROUP_get0_generator(b), ctx) != 0) |
0f113f3e MC |
556 | r = 1; |
557 | ||
558 | if (!r) { | |
be2e334f | 559 | const BIGNUM *ao, *bo, *ac, *bc; |
ac2b52c6 | 560 | /* compare the orders */ |
be2e334f DSH |
561 | ao = EC_GROUP_get0_order(a); |
562 | bo = EC_GROUP_get0_order(b); | |
be2e334f | 563 | if (ao == NULL || bo == NULL) { |
8402cd5f SL |
564 | /* return an error if either order is NULL */ |
565 | r = -1; | |
566 | goto end; | |
567 | } | |
568 | if (BN_cmp(ao, bo) != 0) { | |
569 | /* return 1 if orders are different */ | |
570 | r = 1; | |
571 | goto end; | |
0f113f3e | 572 | } |
8402cd5f SL |
573 | /* |
574 | * It gets here if the curve parameters and generator matched. | |
575 | * Now check the optional cofactors (if both are present). | |
576 | */ | |
577 | ac = EC_GROUP_get0_cofactor(a); | |
578 | bc = EC_GROUP_get0_cofactor(b); | |
579 | /* Returns 1 (mismatch) if both cofactors are specified and different */ | |
580 | if (!BN_is_zero(ac) && !BN_is_zero(bc) && BN_cmp(ac, bc) != 0) | |
0f113f3e | 581 | r = 1; |
8402cd5f | 582 | /* Returns 0 if the parameters matched */ |
0f113f3e | 583 | } |
8402cd5f | 584 | end: |
0f113f3e | 585 | BN_CTX_end(ctx); |
a9612d6c | 586 | #ifndef FIPS_MODE |
23a1d5e9 | 587 | BN_CTX_free(ctx_new); |
a9612d6c | 588 | #endif |
0f113f3e MC |
589 | return r; |
590 | } | |
ada0e717 | 591 | |
0657bf9c BM |
592 | /* functions for EC_POINT objects */ |
593 | ||
594 | EC_POINT *EC_POINT_new(const EC_GROUP *group) | |
0f113f3e MC |
595 | { |
596 | EC_POINT *ret; | |
597 | ||
598 | if (group == NULL) { | |
599 | ECerr(EC_F_EC_POINT_NEW, ERR_R_PASSED_NULL_PARAMETER); | |
600 | return NULL; | |
601 | } | |
f06080cb | 602 | if (group->meth->point_init == NULL) { |
0f113f3e MC |
603 | ECerr(EC_F_EC_POINT_NEW, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
604 | return NULL; | |
605 | } | |
606 | ||
1b4cf96f | 607 | ret = OPENSSL_zalloc(sizeof(*ret)); |
0f113f3e MC |
608 | if (ret == NULL) { |
609 | ECerr(EC_F_EC_POINT_NEW, ERR_R_MALLOC_FAILURE); | |
610 | return NULL; | |
611 | } | |
612 | ||
613 | ret->meth = group->meth; | |
b14e6015 | 614 | ret->curve_name = group->curve_name; |
0f113f3e MC |
615 | |
616 | if (!ret->meth->point_init(ret)) { | |
617 | OPENSSL_free(ret); | |
618 | return NULL; | |
619 | } | |
620 | ||
621 | return ret; | |
622 | } | |
0657bf9c BM |
623 | |
624 | void EC_POINT_free(EC_POINT *point) | |
0f113f3e MC |
625 | { |
626 | if (!point) | |
627 | return; | |
7711de24 | 628 | |
0f113f3e MC |
629 | if (point->meth->point_finish != 0) |
630 | point->meth->point_finish(point); | |
631 | OPENSSL_free(point); | |
632 | } | |
0657bf9c BM |
633 | |
634 | void EC_POINT_clear_free(EC_POINT *point) | |
0f113f3e MC |
635 | { |
636 | if (!point) | |
637 | return; | |
638 | ||
639 | if (point->meth->point_clear_finish != 0) | |
640 | point->meth->point_clear_finish(point); | |
641 | else if (point->meth->point_finish != 0) | |
642 | point->meth->point_finish(point); | |
b4faea50 | 643 | OPENSSL_clear_free(point, sizeof(*point)); |
0f113f3e | 644 | } |
0657bf9c BM |
645 | |
646 | int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src) | |
0f113f3e MC |
647 | { |
648 | if (dest->meth->point_copy == 0) { | |
649 | ECerr(EC_F_EC_POINT_COPY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
650 | return 0; | |
651 | } | |
b14e6015 MC |
652 | if (dest->meth != src->meth |
653 | || (dest->curve_name != src->curve_name | |
8402cd5f SL |
654 | && dest->curve_name != 0 |
655 | && src->curve_name != 0)) { | |
0f113f3e MC |
656 | ECerr(EC_F_EC_POINT_COPY, EC_R_INCOMPATIBLE_OBJECTS); |
657 | return 0; | |
658 | } | |
659 | if (dest == src) | |
660 | return 1; | |
661 | return dest->meth->point_copy(dest, src); | |
662 | } | |
0657bf9c | 663 | |
7793f30e | 664 | EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group) |
0f113f3e MC |
665 | { |
666 | EC_POINT *t; | |
667 | int r; | |
668 | ||
669 | if (a == NULL) | |
670 | return NULL; | |
671 | ||
672 | t = EC_POINT_new(group); | |
673 | if (t == NULL) | |
26a7d938 | 674 | return NULL; |
0f113f3e MC |
675 | r = EC_POINT_copy(t, a); |
676 | if (!r) { | |
677 | EC_POINT_free(t); | |
678 | return NULL; | |
8fdc3734 RS |
679 | } |
680 | return t; | |
0f113f3e | 681 | } |
7793f30e | 682 | |
48fe4d62 | 683 | const EC_METHOD *EC_POINT_method_of(const EC_POINT *point) |
0f113f3e MC |
684 | { |
685 | return point->meth; | |
686 | } | |
48fe4d62 | 687 | |
226cc7de | 688 | int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point) |
0f113f3e MC |
689 | { |
690 | if (group->meth->point_set_to_infinity == 0) { | |
691 | ECerr(EC_F_EC_POINT_SET_TO_INFINITY, | |
692 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
693 | return 0; | |
694 | } | |
695 | if (group->meth != point->meth) { | |
696 | ECerr(EC_F_EC_POINT_SET_TO_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); | |
697 | return 0; | |
698 | } | |
699 | return group->meth->point_set_to_infinity(group, point); | |
700 | } | |
701 | ||
702 | int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
703 | EC_POINT *point, const BIGNUM *x, | |
704 | const BIGNUM *y, const BIGNUM *z, | |
705 | BN_CTX *ctx) | |
706 | { | |
707 | if (group->meth->point_set_Jprojective_coordinates_GFp == 0) { | |
708 | ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, | |
709 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
710 | return 0; | |
711 | } | |
b14e6015 | 712 | if (!ec_point_is_compat(point, group)) { |
0f113f3e MC |
713 | ECerr(EC_F_EC_POINT_SET_JPROJECTIVE_COORDINATES_GFP, |
714 | EC_R_INCOMPATIBLE_OBJECTS); | |
715 | return 0; | |
716 | } | |
717 | return group->meth->point_set_Jprojective_coordinates_GFp(group, point, x, | |
718 | y, z, ctx); | |
719 | } | |
720 | ||
721 | int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
722 | const EC_POINT *point, BIGNUM *x, | |
723 | BIGNUM *y, BIGNUM *z, | |
724 | BN_CTX *ctx) | |
725 | { | |
726 | if (group->meth->point_get_Jprojective_coordinates_GFp == 0) { | |
727 | ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, | |
728 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
729 | return 0; | |
730 | } | |
b14e6015 | 731 | if (!ec_point_is_compat(point, group)) { |
0f113f3e MC |
732 | ECerr(EC_F_EC_POINT_GET_JPROJECTIVE_COORDINATES_GFP, |
733 | EC_R_INCOMPATIBLE_OBJECTS); | |
734 | return 0; | |
735 | } | |
736 | return group->meth->point_get_Jprojective_coordinates_GFp(group, point, x, | |
737 | y, z, ctx); | |
738 | } | |
739 | ||
8e3cced7 MC |
740 | int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *point, |
741 | const BIGNUM *x, const BIGNUM *y, | |
742 | BN_CTX *ctx) | |
0f113f3e | 743 | { |
8e3cced7 MC |
744 | if (group->meth->point_set_affine_coordinates == NULL) { |
745 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES, | |
0f113f3e MC |
746 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
747 | return 0; | |
748 | } | |
b14e6015 | 749 | if (!ec_point_is_compat(point, group)) { |
8e3cced7 | 750 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
751 | return 0; |
752 | } | |
1e2012b7 EK |
753 | if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx)) |
754 | return 0; | |
755 | ||
756 | if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { | |
8e3cced7 | 757 | ECerr(EC_F_EC_POINT_SET_AFFINE_COORDINATES, EC_R_POINT_IS_NOT_ON_CURVE); |
1e2012b7 EK |
758 | return 0; |
759 | } | |
760 | return 1; | |
0f113f3e | 761 | } |
226cc7de | 762 | |
fcd2d5a6 | 763 | #if !OPENSSL_API_3 |
8e3cced7 MC |
764 | int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, |
765 | EC_POINT *point, const BIGNUM *x, | |
766 | const BIGNUM *y, BN_CTX *ctx) | |
767 | { | |
768 | return EC_POINT_set_affine_coordinates(group, point, x, y, ctx); | |
769 | } | |
770 | ||
50db8163 | 771 | # ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
772 | int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, |
773 | EC_POINT *point, const BIGNUM *x, | |
774 | const BIGNUM *y, BN_CTX *ctx) | |
775 | { | |
8e3cced7 MC |
776 | return EC_POINT_set_affine_coordinates(group, point, x, y, ctx); |
777 | } | |
50db8163 | 778 | # endif |
8e3cced7 MC |
779 | #endif |
780 | ||
781 | int EC_POINT_get_affine_coordinates(const EC_GROUP *group, | |
782 | const EC_POINT *point, BIGNUM *x, BIGNUM *y, | |
783 | BN_CTX *ctx) | |
784 | { | |
785 | if (group->meth->point_get_affine_coordinates == NULL) { | |
786 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES, | |
0f113f3e MC |
787 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
788 | return 0; | |
789 | } | |
b14e6015 | 790 | if (!ec_point_is_compat(point, group)) { |
8e3cced7 | 791 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES, EC_R_INCOMPATIBLE_OBJECTS); |
1e2012b7 EK |
792 | return 0; |
793 | } | |
bfb10b97 BB |
794 | if (EC_POINT_is_at_infinity(group, point)) { |
795 | ECerr(EC_F_EC_POINT_GET_AFFINE_COORDINATES, EC_R_POINT_AT_INFINITY); | |
796 | return 0; | |
797 | } | |
8e3cced7 | 798 | return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); |
0f113f3e | 799 | } |
7793f30e | 800 | |
fcd2d5a6 | 801 | #if !OPENSSL_API_3 |
0f113f3e MC |
802 | int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, |
803 | const EC_POINT *point, BIGNUM *x, | |
804 | BIGNUM *y, BN_CTX *ctx) | |
805 | { | |
8e3cced7 | 806 | return EC_POINT_get_affine_coordinates(group, point, x, y, ctx); |
0f113f3e | 807 | } |
7793f30e | 808 | |
50db8163 | 809 | # ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
810 | int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, |
811 | const EC_POINT *point, BIGNUM *x, | |
812 | BIGNUM *y, BN_CTX *ctx) | |
813 | { | |
8e3cced7 | 814 | return EC_POINT_get_affine_coordinates(group, point, x, y, ctx); |
0f113f3e | 815 | } |
50db8163 | 816 | # endif |
b3310161 | 817 | #endif |
7793f30e | 818 | |
0f113f3e MC |
819 | int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, |
820 | const EC_POINT *b, BN_CTX *ctx) | |
821 | { | |
822 | if (group->meth->add == 0) { | |
823 | ECerr(EC_F_EC_POINT_ADD, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
824 | return 0; | |
825 | } | |
b14e6015 MC |
826 | if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group) |
827 | || !ec_point_is_compat(b, group)) { | |
0f113f3e MC |
828 | ECerr(EC_F_EC_POINT_ADD, EC_R_INCOMPATIBLE_OBJECTS); |
829 | return 0; | |
830 | } | |
831 | return group->meth->add(group, r, a, b, ctx); | |
832 | } | |
833 | ||
834 | int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, | |
835 | BN_CTX *ctx) | |
836 | { | |
837 | if (group->meth->dbl == 0) { | |
838 | ECerr(EC_F_EC_POINT_DBL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
839 | return 0; | |
840 | } | |
b14e6015 | 841 | if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)) { |
0f113f3e MC |
842 | ECerr(EC_F_EC_POINT_DBL, EC_R_INCOMPATIBLE_OBJECTS); |
843 | return 0; | |
844 | } | |
845 | return group->meth->dbl(group, r, a, ctx); | |
846 | } | |
0657bf9c | 847 | |
1d5bd6cf | 848 | int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx) |
0f113f3e MC |
849 | { |
850 | if (group->meth->invert == 0) { | |
851 | ECerr(EC_F_EC_POINT_INVERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
852 | return 0; | |
853 | } | |
b14e6015 | 854 | if (!ec_point_is_compat(a, group)) { |
0f113f3e MC |
855 | ECerr(EC_F_EC_POINT_INVERT, EC_R_INCOMPATIBLE_OBJECTS); |
856 | return 0; | |
857 | } | |
858 | return group->meth->invert(group, a, ctx); | |
859 | } | |
1d5bd6cf | 860 | |
0657bf9c | 861 | int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point) |
0f113f3e MC |
862 | { |
863 | if (group->meth->is_at_infinity == 0) { | |
864 | ECerr(EC_F_EC_POINT_IS_AT_INFINITY, | |
865 | ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
866 | return 0; | |
867 | } | |
b14e6015 | 868 | if (!ec_point_is_compat(point, group)) { |
0f113f3e MC |
869 | ECerr(EC_F_EC_POINT_IS_AT_INFINITY, EC_R_INCOMPATIBLE_OBJECTS); |
870 | return 0; | |
871 | } | |
872 | return group->meth->is_at_infinity(group, point); | |
873 | } | |
874 | ||
68886be7 MC |
875 | /* |
876 | * Check whether an EC_POINT is on the curve or not. Note that the return | |
877 | * value for this function should NOT be treated as a boolean. Return values: | |
878 | * 1: The point is on the curve | |
879 | * 0: The point is not on the curve | |
880 | * -1: An error occurred | |
881 | */ | |
0f113f3e MC |
882 | int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, |
883 | BN_CTX *ctx) | |
884 | { | |
885 | if (group->meth->is_on_curve == 0) { | |
886 | ECerr(EC_F_EC_POINT_IS_ON_CURVE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
887 | return 0; | |
888 | } | |
b14e6015 | 889 | if (!ec_point_is_compat(point, group)) { |
0f113f3e MC |
890 | ECerr(EC_F_EC_POINT_IS_ON_CURVE, EC_R_INCOMPATIBLE_OBJECTS); |
891 | return 0; | |
892 | } | |
893 | return group->meth->is_on_curve(group, point, ctx); | |
894 | } | |
895 | ||
896 | int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, | |
897 | BN_CTX *ctx) | |
898 | { | |
899 | if (group->meth->point_cmp == 0) { | |
900 | ECerr(EC_F_EC_POINT_CMP, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
901 | return -1; | |
902 | } | |
b14e6015 | 903 | if (!ec_point_is_compat(a, group) || !ec_point_is_compat(b, group)) { |
0f113f3e MC |
904 | ECerr(EC_F_EC_POINT_CMP, EC_R_INCOMPATIBLE_OBJECTS); |
905 | return -1; | |
906 | } | |
907 | return group->meth->point_cmp(group, a, b, ctx); | |
908 | } | |
1d5bd6cf | 909 | |
e869d4bd | 910 | int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx) |
0f113f3e MC |
911 | { |
912 | if (group->meth->make_affine == 0) { | |
913 | ECerr(EC_F_EC_POINT_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
914 | return 0; | |
915 | } | |
b14e6015 | 916 | if (!ec_point_is_compat(point, group)) { |
0f113f3e MC |
917 | ECerr(EC_F_EC_POINT_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); |
918 | return 0; | |
919 | } | |
920 | return group->meth->make_affine(group, point, ctx); | |
921 | } | |
922 | ||
923 | int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, | |
924 | EC_POINT *points[], BN_CTX *ctx) | |
925 | { | |
926 | size_t i; | |
927 | ||
928 | if (group->meth->points_make_affine == 0) { | |
929 | ECerr(EC_F_EC_POINTS_MAKE_AFFINE, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); | |
930 | return 0; | |
931 | } | |
932 | for (i = 0; i < num; i++) { | |
b14e6015 | 933 | if (!ec_point_is_compat(points[i], group)) { |
0f113f3e MC |
934 | ECerr(EC_F_EC_POINTS_MAKE_AFFINE, EC_R_INCOMPATIBLE_OBJECTS); |
935 | return 0; | |
936 | } | |
937 | } | |
938 | return group->meth->points_make_affine(group, num, points, ctx); | |
939 | } | |
940 | ||
941 | /* | |
942 | * Functions for point multiplication. If group->meth->mul is 0, we use the | |
943 | * wNAF-based implementations in ec_mult.c; otherwise we dispatch through | |
944 | * methods. | |
37c660ff BM |
945 | */ |
946 | ||
947 | int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, | |
0f113f3e MC |
948 | size_t num, const EC_POINT *points[], |
949 | const BIGNUM *scalars[], BN_CTX *ctx) | |
950 | { | |
01ad66f8 NT |
951 | int ret = 0; |
952 | size_t i = 0; | |
a9612d6c | 953 | #ifndef FIPS_MODE |
01ad66f8 NT |
954 | BN_CTX *new_ctx = NULL; |
955 | ||
a9612d6c MC |
956 | if (ctx == NULL) |
957 | ctx = new_ctx = BN_CTX_secure_new(); | |
958 | #endif | |
959 | if (ctx == NULL) { | |
960 | ECerr(EC_F_EC_POINTS_MUL, ERR_R_INTERNAL_ERROR); | |
961 | return 0; | |
962 | } | |
963 | ||
01ad66f8 NT |
964 | if ((scalar == NULL) && (num == 0)) { |
965 | return EC_POINT_set_to_infinity(group, r); | |
966 | } | |
967 | ||
968 | if (!ec_point_is_compat(r, group)) { | |
969 | ECerr(EC_F_EC_POINTS_MUL, EC_R_INCOMPATIBLE_OBJECTS); | |
970 | return 0; | |
971 | } | |
972 | for (i = 0; i < num; i++) { | |
973 | if (!ec_point_is_compat(points[i], group)) { | |
974 | ECerr(EC_F_EC_POINTS_MUL, EC_R_INCOMPATIBLE_OBJECTS); | |
975 | return 0; | |
976 | } | |
977 | } | |
978 | ||
01ad66f8 NT |
979 | if (group->meth->mul != NULL) |
980 | ret = group->meth->mul(group, r, scalar, num, points, scalars, ctx); | |
981 | else | |
0f113f3e | 982 | /* use default */ |
01ad66f8 | 983 | ret = ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx); |
37c660ff | 984 | |
a9612d6c | 985 | #ifndef FIPS_MODE |
01ad66f8 | 986 | BN_CTX_free(new_ctx); |
a9612d6c | 987 | #endif |
01ad66f8 | 988 | return ret; |
0f113f3e | 989 | } |
37c660ff BM |
990 | |
991 | int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, | |
0f113f3e MC |
992 | const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx) |
993 | { | |
994 | /* just a convenient interface to EC_POINTs_mul() */ | |
37c660ff | 995 | |
0f113f3e MC |
996 | const EC_POINT *points[1]; |
997 | const BIGNUM *scalars[1]; | |
37c660ff | 998 | |
0f113f3e MC |
999 | points[0] = point; |
1000 | scalars[0] = p_scalar; | |
37c660ff | 1001 | |
0f113f3e MC |
1002 | return EC_POINTs_mul(group, r, g_scalar, |
1003 | (point != NULL | |
1004 | && p_scalar != NULL), points, scalars, ctx); | |
1005 | } | |
37c660ff BM |
1006 | |
1007 | int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx) | |
0f113f3e MC |
1008 | { |
1009 | if (group->meth->mul == 0) | |
1010 | /* use default */ | |
1011 | return ec_wNAF_precompute_mult(group, ctx); | |
37c660ff | 1012 | |
0f113f3e MC |
1013 | if (group->meth->precompute_mult != 0) |
1014 | return group->meth->precompute_mult(group, ctx); | |
1015 | else | |
1016 | return 1; /* nothing to do, so report success */ | |
1017 | } | |
37c660ff BM |
1018 | |
1019 | int EC_GROUP_have_precompute_mult(const EC_GROUP *group) | |
0f113f3e MC |
1020 | { |
1021 | if (group->meth->mul == 0) | |
1022 | /* use default */ | |
1023 | return ec_wNAF_have_precompute_mult(group); | |
1024 | ||
1025 | if (group->meth->have_precompute_mult != 0) | |
1026 | return group->meth->have_precompute_mult(group); | |
1027 | else | |
1028 | return 0; /* cannot tell whether precomputation has | |
1029 | * been performed */ | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * ec_precompute_mont_data sets |group->mont_data| from |group->order| and | |
1034 | * returns one on success. On error it returns zero. | |
1035 | */ | |
eb791696 | 1036 | static int ec_precompute_mont_data(EC_GROUP *group) |
0f113f3e | 1037 | { |
a9612d6c | 1038 | BN_CTX *ctx = BN_CTX_new_ex(group->libctx); |
0f113f3e MC |
1039 | int ret = 0; |
1040 | ||
23a1d5e9 RS |
1041 | BN_MONT_CTX_free(group->mont_data); |
1042 | group->mont_data = NULL; | |
0f113f3e MC |
1043 | |
1044 | if (ctx == NULL) | |
1045 | goto err; | |
1046 | ||
1047 | group->mont_data = BN_MONT_CTX_new(); | |
90945fa3 | 1048 | if (group->mont_data == NULL) |
0f113f3e MC |
1049 | goto err; |
1050 | ||
1051 | if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) { | |
1052 | BN_MONT_CTX_free(group->mont_data); | |
1053 | group->mont_data = NULL; | |
1054 | goto err; | |
1055 | } | |
1056 | ||
1057 | ret = 1; | |
1058 | ||
1059 | err: | |
1060 | ||
23a1d5e9 | 1061 | BN_CTX_free(ctx); |
0f113f3e MC |
1062 | return ret; |
1063 | } | |
3aef36ff | 1064 | |
a9612d6c | 1065 | #ifndef FIPS_MODE |
3aef36ff RS |
1066 | int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg) |
1067 | { | |
1068 | return CRYPTO_set_ex_data(&key->ex_data, idx, arg); | |
1069 | } | |
1070 | ||
1071 | void *EC_KEY_get_ex_data(const EC_KEY *key, int idx) | |
1072 | { | |
1073 | return CRYPTO_get_ex_data(&key->ex_data, idx); | |
1074 | } | |
a9612d6c | 1075 | #endif |
77470e98 DSH |
1076 | |
1077 | int ec_group_simple_order_bits(const EC_GROUP *group) | |
1078 | { | |
1079 | if (group->order == NULL) | |
1080 | return 0; | |
1081 | return BN_num_bits(group->order); | |
1082 | } | |
eb791696 | 1083 | |
c11d372b | 1084 | static int ec_field_inverse_mod_ord(const EC_GROUP *group, BIGNUM *r, |
792546eb | 1085 | const BIGNUM *x, BN_CTX *ctx) |
c11d372b | 1086 | { |
262dccc0 | 1087 | BIGNUM *e = NULL; |
c11d372b | 1088 | int ret = 0; |
a9612d6c MC |
1089 | #ifndef FIPS_MODE |
1090 | BN_CTX *new_ctx = NULL; | |
c11d372b | 1091 | |
a9612d6c MC |
1092 | if (ctx == NULL) |
1093 | ctx = new_ctx = BN_CTX_secure_new(); | |
1094 | #endif | |
1095 | if (ctx == NULL) | |
792546eb BB |
1096 | return 0; |
1097 | ||
a9612d6c MC |
1098 | if (group->mont_data == NULL) |
1099 | goto err; | |
c11d372b BB |
1100 | |
1101 | BN_CTX_start(ctx); | |
262dccc0 | 1102 | if ((e = BN_CTX_get(ctx)) == NULL) |
c11d372b BB |
1103 | goto err; |
1104 | ||
792546eb BB |
1105 | /*- |
1106 | * We want inverse in constant time, therefore we utilize the fact | |
1107 | * order must be prime and use Fermats Little Theorem instead. | |
1108 | */ | |
1109 | if (!BN_set_word(e, 2)) | |
1110 | goto err; | |
1111 | if (!BN_sub(e, group->order, e)) | |
1112 | goto err; | |
1113 | /*- | |
1114 | * Exponent e is public. | |
1115 | * No need for scatter-gather or BN_FLG_CONSTTIME. | |
1116 | */ | |
1117 | if (!BN_mod_exp_mont(r, x, e, group->order, ctx, group->mont_data)) | |
1118 | goto err; | |
c11d372b | 1119 | |
792546eb | 1120 | ret = 1; |
c11d372b BB |
1121 | |
1122 | err: | |
ce1415ed | 1123 | BN_CTX_end(ctx); |
a9612d6c | 1124 | #ifndef FIPS_MODE |
c11d372b | 1125 | BN_CTX_free(new_ctx); |
a9612d6c | 1126 | #endif |
c11d372b BB |
1127 | return ret; |
1128 | } | |
1129 | ||
792546eb BB |
1130 | /*- |
1131 | * Default behavior, if group->meth->field_inverse_mod_ord is NULL: | |
1132 | * - When group->order is even, this function returns an error. | |
1133 | * - When group->order is otherwise composite, the correctness | |
1134 | * of the output is not guaranteed. | |
1135 | * - When x is outside the range [1, group->order), the correctness | |
1136 | * of the output is not guaranteed. | |
1137 | * - Otherwise, this function returns the multiplicative inverse in the | |
1138 | * range [1, group->order). | |
1139 | * | |
1140 | * EC_METHODs must implement their own field_inverse_mod_ord for | |
1141 | * other functionality. | |
1142 | */ | |
1143 | int ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res, | |
1144 | const BIGNUM *x, BN_CTX *ctx) | |
eb791696 AP |
1145 | { |
1146 | if (group->meth->field_inverse_mod_ord != NULL) | |
1147 | return group->meth->field_inverse_mod_ord(group, res, x, ctx); | |
1148 | else | |
c11d372b | 1149 | return ec_field_inverse_mod_ord(group, res, x, ctx); |
eb791696 | 1150 | } |
f667820c SH |
1151 | |
1152 | /*- | |
1153 | * Coordinate blinding for EC_POINT. | |
1154 | * | |
1155 | * The underlying EC_METHOD can optionally implement this function: | |
1156 | * underlying implementations should return 0 on errors, or 1 on | |
1157 | * success. | |
1158 | * | |
1159 | * This wrapper returns 1 in case the underlying EC_METHOD does not | |
1160 | * support coordinate blinding. | |
1161 | */ | |
1162 | int ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx) | |
1163 | { | |
1164 | if (group->meth->blind_coordinates == NULL) | |
1165 | return 1; /* ignore if not implemented */ | |
1166 | ||
1167 | return group->meth->blind_coordinates(group, p, ctx); | |
1168 | } |