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35b73a1f | 1 | /* |
da1c088f | 2 | * Copyright 2001-2023 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 | |
579422c8 | 11 | /* |
5b5eea4b | 12 | * EC_GROUP low level APIs are deprecated for public use, but still ok for |
579422c8 P |
13 | * internal use. |
14 | */ | |
15 | #include "internal/deprecated.h" | |
16 | ||
c4b36ff4 | 17 | #include <string.h> |
c0f39ded SL |
18 | #include <openssl/params.h> |
19 | #include <openssl/core_names.h> | |
0657bf9c | 20 | #include <openssl/err.h> |
bb62a8b0 | 21 | #include <openssl/opensslv.h> |
a8aad913 | 22 | #include <openssl/param_build.h> |
c0f39ded SL |
23 | #include "crypto/ec.h" |
24 | #include "internal/nelem.h" | |
706457b7 | 25 | #include "ec_local.h" |
0657bf9c | 26 | |
0657bf9c BM |
27 | /* functions for EC_GROUP objects */ |
28 | ||
32ab57cb SL |
29 | EC_GROUP *ossl_ec_group_new_ex(OSSL_LIB_CTX *libctx, const char *propq, |
30 | const EC_METHOD *meth) | |
0f113f3e MC |
31 | { |
32 | EC_GROUP *ret; | |
33 | ||
34 | if (meth == NULL) { | |
9311d0c4 | 35 | ERR_raise(ERR_LIB_EC, EC_R_SLOT_FULL); |
0f113f3e MC |
36 | return NULL; |
37 | } | |
38 | if (meth->group_init == 0) { | |
9311d0c4 | 39 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
40 | return NULL; |
41 | } | |
42 | ||
64b25758 | 43 | ret = OPENSSL_zalloc(sizeof(*ret)); |
e077455e | 44 | if (ret == NULL) |
0f113f3e | 45 | return NULL; |
0f113f3e | 46 | |
a9612d6c | 47 | ret->libctx = libctx; |
2da8d4eb MC |
48 | if (propq != NULL) { |
49 | ret->propq = OPENSSL_strdup(propq); | |
e077455e | 50 | if (ret->propq == NULL) |
2da8d4eb | 51 | goto err; |
2da8d4eb | 52 | } |
0f113f3e | 53 | ret->meth = meth; |
6903e2e7 DSH |
54 | if ((ret->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) { |
55 | ret->order = BN_new(); | |
56 | if (ret->order == NULL) | |
57 | goto err; | |
58 | ret->cofactor = BN_new(); | |
59 | if (ret->cofactor == NULL) | |
60 | goto err; | |
61 | } | |
9db6af92 | 62 | ret->asn1_flag = OPENSSL_EC_EXPLICIT_CURVE; |
0f113f3e | 63 | ret->asn1_form = POINT_CONVERSION_UNCOMPRESSED; |
0f113f3e MC |
64 | if (!meth->group_init(ret)) |
65 | goto err; | |
0f113f3e | 66 | return ret; |
64b25758 | 67 | |
0f113f3e | 68 | err: |
23a1d5e9 RS |
69 | BN_free(ret->order); |
70 | BN_free(ret->cofactor); | |
2da8d4eb | 71 | OPENSSL_free(ret->propq); |
0f113f3e MC |
72 | OPENSSL_free(ret); |
73 | return NULL; | |
74 | } | |
0657bf9c | 75 | |
23ccae80 BB |
76 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
77 | # ifndef FIPS_MODULE | |
a9612d6c MC |
78 | EC_GROUP *EC_GROUP_new(const EC_METHOD *meth) |
79 | { | |
32ab57cb | 80 | return ossl_ec_group_new_ex(NULL, NULL, meth); |
a9612d6c | 81 | } |
23ccae80 | 82 | # endif |
a9612d6c MC |
83 | #endif |
84 | ||
2c52ac9b | 85 | void EC_pre_comp_free(EC_GROUP *group) |
3aef36ff RS |
86 | { |
87 | switch (group->pre_comp_type) { | |
f3b3d7f0 | 88 | case PCT_none: |
3aef36ff | 89 | break; |
66117ab0 | 90 | case PCT_nistz256: |
f3b3d7f0 | 91 | #ifdef ECP_NISTZ256_ASM |
3aef36ff | 92 | EC_nistz256_pre_comp_free(group->pre_comp.nistz256); |
e69aa800 | 93 | #endif |
f3b3d7f0 | 94 | break; |
3aef36ff | 95 | #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 |
66117ab0 | 96 | case PCT_nistp224: |
3aef36ff RS |
97 | EC_nistp224_pre_comp_free(group->pre_comp.nistp224); |
98 | break; | |
66117ab0 | 99 | case PCT_nistp256: |
3aef36ff RS |
100 | EC_nistp256_pre_comp_free(group->pre_comp.nistp256); |
101 | break; | |
01d901e4 RM |
102 | case PCT_nistp384: |
103 | ossl_ec_nistp384_pre_comp_free(group->pre_comp.nistp384); | |
104 | break; | |
66117ab0 | 105 | case PCT_nistp521: |
3aef36ff RS |
106 | EC_nistp521_pre_comp_free(group->pre_comp.nistp521); |
107 | break; | |
f3b3d7f0 RS |
108 | #else |
109 | case PCT_nistp224: | |
110 | case PCT_nistp256: | |
01d901e4 | 111 | case PCT_nistp384: |
f3b3d7f0 RS |
112 | case PCT_nistp521: |
113 | break; | |
3aef36ff | 114 | #endif |
66117ab0 | 115 | case PCT_ec: |
3aef36ff RS |
116 | EC_ec_pre_comp_free(group->pre_comp.ec); |
117 | break; | |
118 | } | |
119 | group->pre_comp.ec = NULL; | |
120 | } | |
121 | ||
0657bf9c | 122 | void EC_GROUP_free(EC_GROUP *group) |
0f113f3e MC |
123 | { |
124 | if (!group) | |
125 | return; | |
7711de24 | 126 | |
0f113f3e MC |
127 | if (group->meth->group_finish != 0) |
128 | group->meth->group_finish(group); | |
df9cc153 | 129 | |
2c52ac9b | 130 | EC_pre_comp_free(group); |
23a1d5e9 | 131 | BN_MONT_CTX_free(group->mont_data); |
8fdc3734 | 132 | EC_POINT_free(group->generator); |
0f113f3e MC |
133 | BN_free(group->order); |
134 | BN_free(group->cofactor); | |
25aaa98a | 135 | OPENSSL_free(group->seed); |
2da8d4eb | 136 | OPENSSL_free(group->propq); |
0f113f3e MC |
137 | OPENSSL_free(group); |
138 | } | |
0657bf9c | 139 | |
936c2b9e | 140 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
0657bf9c | 141 | void EC_GROUP_clear_free(EC_GROUP *group) |
0f113f3e MC |
142 | { |
143 | if (!group) | |
144 | return; | |
df9cc153 | 145 | |
0f113f3e MC |
146 | if (group->meth->group_clear_finish != 0) |
147 | group->meth->group_clear_finish(group); | |
148 | else if (group->meth->group_finish != 0) | |
149 | group->meth->group_finish(group); | |
df9cc153 | 150 | |
2c52ac9b | 151 | EC_pre_comp_free(group); |
23a1d5e9 | 152 | BN_MONT_CTX_free(group->mont_data); |
8fdc3734 | 153 | EC_POINT_clear_free(group->generator); |
0f113f3e MC |
154 | BN_clear_free(group->order); |
155 | BN_clear_free(group->cofactor); | |
4b45c6e5 | 156 | OPENSSL_clear_free(group->seed, group->seed_len); |
b4faea50 | 157 | OPENSSL_clear_free(group, sizeof(*group)); |
0f113f3e | 158 | } |
4a7a4972 | 159 | #endif |
0657bf9c BM |
160 | |
161 | int EC_GROUP_copy(EC_GROUP *dest, const EC_GROUP *src) | |
0f113f3e | 162 | { |
0f113f3e | 163 | if (dest->meth->group_copy == 0) { |
9311d0c4 | 164 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
165 | return 0; |
166 | } | |
167 | if (dest->meth != src->meth) { | |
9311d0c4 | 168 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
169 | return 0; |
170 | } | |
171 | if (dest == src) | |
172 | return 1; | |
173 | ||
a9612d6c | 174 | dest->libctx = src->libctx; |
b14e6015 MC |
175 | dest->curve_name = src->curve_name; |
176 | ||
3aef36ff RS |
177 | /* Copy precomputed */ |
178 | dest->pre_comp_type = src->pre_comp_type; | |
179 | switch (src->pre_comp_type) { | |
f3b3d7f0 | 180 | case PCT_none: |
3aef36ff RS |
181 | dest->pre_comp.ec = NULL; |
182 | break; | |
66117ab0 | 183 | case PCT_nistz256: |
f3b3d7f0 | 184 | #ifdef ECP_NISTZ256_ASM |
3aef36ff | 185 | dest->pre_comp.nistz256 = EC_nistz256_pre_comp_dup(src->pre_comp.nistz256); |
e69aa800 | 186 | #endif |
f3b3d7f0 | 187 | break; |
3aef36ff | 188 | #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 |
66117ab0 | 189 | case PCT_nistp224: |
3aef36ff RS |
190 | dest->pre_comp.nistp224 = EC_nistp224_pre_comp_dup(src->pre_comp.nistp224); |
191 | break; | |
66117ab0 | 192 | case PCT_nistp256: |
3aef36ff RS |
193 | dest->pre_comp.nistp256 = EC_nistp256_pre_comp_dup(src->pre_comp.nistp256); |
194 | break; | |
01d901e4 RM |
195 | case PCT_nistp384: |
196 | dest->pre_comp.nistp384 = ossl_ec_nistp384_pre_comp_dup(src->pre_comp.nistp384); | |
197 | break; | |
66117ab0 | 198 | case PCT_nistp521: |
3aef36ff RS |
199 | dest->pre_comp.nistp521 = EC_nistp521_pre_comp_dup(src->pre_comp.nistp521); |
200 | break; | |
f3b3d7f0 RS |
201 | #else |
202 | case PCT_nistp224: | |
203 | case PCT_nistp256: | |
01d901e4 | 204 | case PCT_nistp384: |
f3b3d7f0 RS |
205 | case PCT_nistp521: |
206 | break; | |
3aef36ff | 207 | #endif |
66117ab0 | 208 | case PCT_ec: |
3aef36ff RS |
209 | dest->pre_comp.ec = EC_ec_pre_comp_dup(src->pre_comp.ec); |
210 | break; | |
0f113f3e MC |
211 | } |
212 | ||
213 | if (src->mont_data != NULL) { | |
214 | if (dest->mont_data == NULL) { | |
215 | dest->mont_data = BN_MONT_CTX_new(); | |
216 | if (dest->mont_data == NULL) | |
217 | return 0; | |
218 | } | |
219 | if (!BN_MONT_CTX_copy(dest->mont_data, src->mont_data)) | |
220 | return 0; | |
221 | } else { | |
222 | /* src->generator == NULL */ | |
23a1d5e9 RS |
223 | BN_MONT_CTX_free(dest->mont_data); |
224 | dest->mont_data = NULL; | |
0f113f3e | 225 | } |
0657bf9c | 226 | |
0f113f3e MC |
227 | if (src->generator != NULL) { |
228 | if (dest->generator == NULL) { | |
229 | dest->generator = EC_POINT_new(dest); | |
230 | if (dest->generator == NULL) | |
231 | return 0; | |
232 | } | |
233 | if (!EC_POINT_copy(dest->generator, src->generator)) | |
234 | return 0; | |
235 | } else { | |
236 | /* src->generator == NULL */ | |
8fdc3734 RS |
237 | EC_POINT_clear_free(dest->generator); |
238 | dest->generator = NULL; | |
0f113f3e MC |
239 | } |
240 | ||
6903e2e7 DSH |
241 | if ((src->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0) { |
242 | if (!BN_copy(dest->order, src->order)) | |
243 | return 0; | |
244 | if (!BN_copy(dest->cofactor, src->cofactor)) | |
245 | return 0; | |
246 | } | |
0f113f3e | 247 | |
0f113f3e MC |
248 | dest->asn1_flag = src->asn1_flag; |
249 | dest->asn1_form = src->asn1_form; | |
fe2f8aec | 250 | dest->decoded_from_explicit_params = src->decoded_from_explicit_params; |
0f113f3e MC |
251 | |
252 | if (src->seed) { | |
b548a1f1 | 253 | OPENSSL_free(dest->seed); |
e077455e | 254 | if ((dest->seed = OPENSSL_malloc(src->seed_len)) == NULL) |
0f113f3e MC |
255 | return 0; |
256 | if (!memcpy(dest->seed, src->seed, src->seed_len)) | |
257 | return 0; | |
258 | dest->seed_len = src->seed_len; | |
259 | } else { | |
b548a1f1 | 260 | OPENSSL_free(dest->seed); |
0f113f3e MC |
261 | dest->seed = NULL; |
262 | dest->seed_len = 0; | |
263 | } | |
264 | ||
265 | return dest->meth->group_copy(dest, src); | |
266 | } | |
0657bf9c | 267 | |
7793f30e | 268 | EC_GROUP *EC_GROUP_dup(const EC_GROUP *a) |
0f113f3e MC |
269 | { |
270 | EC_GROUP *t = NULL; | |
271 | int ok = 0; | |
7793f30e | 272 | |
0f113f3e MC |
273 | if (a == NULL) |
274 | return NULL; | |
7793f30e | 275 | |
32ab57cb | 276 | if ((t = ossl_ec_group_new_ex(a->libctx, a->propq, a->meth)) == NULL) |
26a7d938 | 277 | return NULL; |
0f113f3e MC |
278 | if (!EC_GROUP_copy(t, a)) |
279 | goto err; | |
7793f30e | 280 | |
0f113f3e | 281 | ok = 1; |
7793f30e | 282 | |
0f113f3e MC |
283 | err: |
284 | if (!ok) { | |
8fdc3734 | 285 | EC_GROUP_free(t); |
0f113f3e | 286 | return NULL; |
8fdc3734 | 287 | } |
0f113f3e MC |
288 | return t; |
289 | } | |
7793f30e | 290 | |
23ccae80 | 291 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
48fe4d62 | 292 | const EC_METHOD *EC_GROUP_method_of(const EC_GROUP *group) |
0f113f3e MC |
293 | { |
294 | return group->meth; | |
295 | } | |
48fe4d62 | 296 | |
458c2917 | 297 | int EC_METHOD_get_field_type(const EC_METHOD *meth) |
0f113f3e MC |
298 | { |
299 | return meth->field_type; | |
300 | } | |
23ccae80 | 301 | #endif |
0f113f3e | 302 | |
eb791696 AP |
303 | static int ec_precompute_mont_data(EC_GROUP *); |
304 | ||
b783beea BB |
305 | /*- |
306 | * Try computing cofactor from the generator order (n) and field cardinality (q). | |
307 | * This works for all curves of cryptographic interest. | |
308 | * | |
309 | * Hasse thm: q + 1 - 2*sqrt(q) <= n*h <= q + 1 + 2*sqrt(q) | |
310 | * h_min = (q + 1 - 2*sqrt(q))/n | |
311 | * h_max = (q + 1 + 2*sqrt(q))/n | |
312 | * h_max - h_min = 4*sqrt(q)/n | |
313 | * So if n > 4*sqrt(q) holds, there is only one possible value for h: | |
314 | * h = \lfloor (h_min + h_max)/2 \rceil = \lfloor (q + 1)/n \rceil | |
315 | * | |
316 | * Otherwise, zero cofactor and return success. | |
317 | */ | |
318 | static int ec_guess_cofactor(EC_GROUP *group) { | |
319 | int ret = 0; | |
320 | BN_CTX *ctx = NULL; | |
321 | BIGNUM *q = NULL; | |
322 | ||
323 | /*- | |
324 | * If the cofactor is too large, we cannot guess it. | |
325 | * The RHS of below is a strict overestimate of lg(4 * sqrt(q)) | |
326 | */ | |
327 | if (BN_num_bits(group->order) <= (BN_num_bits(group->field) + 1) / 2 + 3) { | |
328 | /* default to 0 */ | |
329 | BN_zero(group->cofactor); | |
330 | /* return success */ | |
331 | return 1; | |
332 | } | |
333 | ||
334 | if ((ctx = BN_CTX_new_ex(group->libctx)) == NULL) | |
335 | return 0; | |
336 | ||
337 | BN_CTX_start(ctx); | |
338 | if ((q = BN_CTX_get(ctx)) == NULL) | |
339 | goto err; | |
340 | ||
341 | /* set q = 2**m for binary fields; q = p otherwise */ | |
342 | if (group->meth->field_type == NID_X9_62_characteristic_two_field) { | |
343 | BN_zero(q); | |
344 | if (!BN_set_bit(q, BN_num_bits(group->field) - 1)) | |
345 | goto err; | |
346 | } else { | |
347 | if (!BN_copy(q, group->field)) | |
348 | goto err; | |
349 | } | |
350 | ||
351 | /* compute h = \lfloor (q + 1)/n \rceil = \lfloor (q + 1 + n/2)/n \rfloor */ | |
352 | if (!BN_rshift1(group->cofactor, group->order) /* n/2 */ | |
353 | || !BN_add(group->cofactor, group->cofactor, q) /* q + n/2 */ | |
354 | /* q + 1 + n/2 */ | |
355 | || !BN_add(group->cofactor, group->cofactor, BN_value_one()) | |
356 | /* (q + 1 + n/2)/n */ | |
357 | || !BN_div(group->cofactor, NULL, group->cofactor, group->order, ctx)) | |
358 | goto err; | |
359 | ret = 1; | |
360 | err: | |
361 | BN_CTX_end(ctx); | |
362 | BN_CTX_free(ctx); | |
363 | return ret; | |
364 | } | |
365 | ||
0f113f3e MC |
366 | int EC_GROUP_set_generator(EC_GROUP *group, const EC_POINT *generator, |
367 | const BIGNUM *order, const BIGNUM *cofactor) | |
368 | { | |
369 | if (generator == NULL) { | |
9311d0c4 | 370 | ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER); |
0f113f3e MC |
371 | return 0; |
372 | } | |
373 | ||
b783beea BB |
374 | /* require group->field >= 1 */ |
375 | if (group->field == NULL || BN_is_zero(group->field) | |
376 | || BN_is_negative(group->field)) { | |
9311d0c4 | 377 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD); |
b783beea BB |
378 | return 0; |
379 | } | |
380 | ||
381 | /*- | |
382 | * - require order >= 1 | |
383 | * - enforce upper bound due to Hasse thm: order can be no more than one bit | |
384 | * longer than field cardinality | |
385 | */ | |
386 | if (order == NULL || BN_is_zero(order) || BN_is_negative(order) | |
387 | || BN_num_bits(order) > BN_num_bits(group->field) + 1) { | |
9311d0c4 | 388 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER); |
b783beea BB |
389 | return 0; |
390 | } | |
391 | ||
392 | /*- | |
393 | * Unfortunately the cofactor is an optional field in many standards. | |
394 | * Internally, the lib uses 0 cofactor as a marker for "unknown cofactor". | |
395 | * So accept cofactor == NULL or cofactor >= 0. | |
396 | */ | |
397 | if (cofactor != NULL && BN_is_negative(cofactor)) { | |
9311d0c4 | 398 | ERR_raise(ERR_LIB_EC, EC_R_UNKNOWN_COFACTOR); |
b783beea BB |
399 | return 0; |
400 | } | |
401 | ||
0f113f3e MC |
402 | if (group->generator == NULL) { |
403 | group->generator = EC_POINT_new(group); | |
404 | if (group->generator == NULL) | |
405 | return 0; | |
406 | } | |
407 | if (!EC_POINT_copy(group->generator, generator)) | |
408 | return 0; | |
409 | ||
b783beea BB |
410 | if (!BN_copy(group->order, order)) |
411 | return 0; | |
0f113f3e | 412 | |
b783beea BB |
413 | /* Either take the provided positive cofactor, or try to compute it */ |
414 | if (cofactor != NULL && !BN_is_zero(cofactor)) { | |
0f113f3e MC |
415 | if (!BN_copy(group->cofactor, cofactor)) |
416 | return 0; | |
b783beea | 417 | } else if (!ec_guess_cofactor(group)) { |
0f113f3e | 418 | BN_zero(group->cofactor); |
b783beea | 419 | return 0; |
8402cd5f | 420 | } |
b783beea | 421 | |
0f113f3e | 422 | /* |
3a6a4a93 | 423 | * Some groups have an order with |
0f113f3e MC |
424 | * factors of two, which makes the Montgomery setup fail. |
425 | * |group->mont_data| will be NULL in this case. | |
426 | */ | |
3a6a4a93 BB |
427 | if (BN_is_odd(group->order)) { |
428 | return ec_precompute_mont_data(group); | |
429 | } | |
0f113f3e | 430 | |
3a6a4a93 BB |
431 | BN_MONT_CTX_free(group->mont_data); |
432 | group->mont_data = NULL; | |
0f113f3e MC |
433 | return 1; |
434 | } | |
bb62a8b0 | 435 | |
9dd84053 | 436 | const EC_POINT *EC_GROUP_get0_generator(const EC_GROUP *group) |
0f113f3e MC |
437 | { |
438 | return group->generator; | |
439 | } | |
bb62a8b0 | 440 | |
f54be179 | 441 | BN_MONT_CTX *EC_GROUP_get_mont_data(const EC_GROUP *group) |
0f113f3e MC |
442 | { |
443 | return group->mont_data; | |
444 | } | |
bb62a8b0 | 445 | |
b6db386f | 446 | int EC_GROUP_get_order(const EC_GROUP *group, BIGNUM *order, BN_CTX *ctx) |
0f113f3e | 447 | { |
be2e334f DSH |
448 | if (group->order == NULL) |
449 | return 0; | |
0f113f3e MC |
450 | if (!BN_copy(order, group->order)) |
451 | return 0; | |
0657bf9c | 452 | |
0f113f3e MC |
453 | return !BN_is_zero(order); |
454 | } | |
0657bf9c | 455 | |
be2e334f DSH |
456 | const BIGNUM *EC_GROUP_get0_order(const EC_GROUP *group) |
457 | { | |
458 | return group->order; | |
459 | } | |
460 | ||
461 | int EC_GROUP_order_bits(const EC_GROUP *group) | |
462 | { | |
77470e98 | 463 | return group->meth->group_order_bits(group); |
be2e334f DSH |
464 | } |
465 | ||
0f113f3e MC |
466 | int EC_GROUP_get_cofactor(const EC_GROUP *group, BIGNUM *cofactor, |
467 | BN_CTX *ctx) | |
468 | { | |
be2e334f DSH |
469 | |
470 | if (group->cofactor == NULL) | |
471 | return 0; | |
0f113f3e MC |
472 | if (!BN_copy(cofactor, group->cofactor)) |
473 | return 0; | |
48fe4d62 | 474 | |
0f113f3e MC |
475 | return !BN_is_zero(group->cofactor); |
476 | } | |
48fe4d62 | 477 | |
be2e334f DSH |
478 | const BIGNUM *EC_GROUP_get0_cofactor(const EC_GROUP *group) |
479 | { | |
480 | return group->cofactor; | |
481 | } | |
482 | ||
7dc17a6c | 483 | void EC_GROUP_set_curve_name(EC_GROUP *group, int nid) |
0f113f3e MC |
484 | { |
485 | group->curve_name = nid; | |
9db6af92 RL |
486 | group->asn1_flag = |
487 | (nid != NID_undef) | |
488 | ? OPENSSL_EC_NAMED_CURVE | |
489 | : OPENSSL_EC_EXPLICIT_CURVE; | |
0f113f3e | 490 | } |
b6db386f | 491 | |
7dc17a6c | 492 | int EC_GROUP_get_curve_name(const EC_GROUP *group) |
0f113f3e MC |
493 | { |
494 | return group->curve_name; | |
495 | } | |
b6db386f | 496 | |
fa1f0306 DA |
497 | const BIGNUM *EC_GROUP_get0_field(const EC_GROUP *group) |
498 | { | |
499 | return group->field; | |
500 | } | |
501 | ||
23ccae80 BB |
502 | int EC_GROUP_get_field_type(const EC_GROUP *group) |
503 | { | |
504 | return group->meth->field_type; | |
505 | } | |
506 | ||
458c2917 | 507 | void EC_GROUP_set_asn1_flag(EC_GROUP *group, int flag) |
0f113f3e MC |
508 | { |
509 | group->asn1_flag = flag; | |
510 | } | |
458c2917 BM |
511 | |
512 | int EC_GROUP_get_asn1_flag(const EC_GROUP *group) | |
0f113f3e MC |
513 | { |
514 | return group->asn1_flag; | |
515 | } | |
458c2917 | 516 | |
0f113f3e | 517 | void EC_GROUP_set_point_conversion_form(EC_GROUP *group, |
254ef80d | 518 | point_conversion_form_t form) |
0f113f3e MC |
519 | { |
520 | group->asn1_form = form; | |
521 | } | |
254ef80d | 522 | |
0f113f3e MC |
523 | point_conversion_form_t EC_GROUP_get_point_conversion_form(const EC_GROUP |
524 | *group) | |
525 | { | |
526 | return group->asn1_form; | |
527 | } | |
254ef80d | 528 | |
5f3d6f70 | 529 | size_t EC_GROUP_set_seed(EC_GROUP *group, const unsigned char *p, size_t len) |
0f113f3e | 530 | { |
b548a1f1 RS |
531 | OPENSSL_free(group->seed); |
532 | group->seed = NULL; | |
533 | group->seed_len = 0; | |
5f3d6f70 | 534 | |
0f113f3e MC |
535 | if (!len || !p) |
536 | return 1; | |
5f3d6f70 | 537 | |
e077455e | 538 | if ((group->seed = OPENSSL_malloc(len)) == NULL) |
0f113f3e MC |
539 | return 0; |
540 | memcpy(group->seed, p, len); | |
541 | group->seed_len = len; | |
5f3d6f70 | 542 | |
0f113f3e MC |
543 | return len; |
544 | } | |
5f3d6f70 BM |
545 | |
546 | unsigned char *EC_GROUP_get0_seed(const EC_GROUP *group) | |
0f113f3e MC |
547 | { |
548 | return group->seed; | |
549 | } | |
5f3d6f70 BM |
550 | |
551 | size_t EC_GROUP_get_seed_len(const EC_GROUP *group) | |
0f113f3e MC |
552 | { |
553 | return group->seed_len; | |
554 | } | |
555 | ||
8e3cced7 MC |
556 | int EC_GROUP_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
557 | const BIGNUM *b, BN_CTX *ctx) | |
0f113f3e MC |
558 | { |
559 | if (group->meth->group_set_curve == 0) { | |
9311d0c4 | 560 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
561 | return 0; |
562 | } | |
563 | return group->meth->group_set_curve(group, p, a, b, ctx); | |
564 | } | |
565 | ||
8e3cced7 MC |
566 | int EC_GROUP_get_curve(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, BIGNUM *b, |
567 | BN_CTX *ctx) | |
0f113f3e | 568 | { |
8e3cced7 | 569 | if (group->meth->group_get_curve == NULL) { |
9311d0c4 | 570 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
571 | return 0; |
572 | } | |
573 | return group->meth->group_get_curve(group, p, a, b, ctx); | |
574 | } | |
7793f30e | 575 | |
936c2b9e | 576 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
8e3cced7 MC |
577 | int EC_GROUP_set_curve_GFp(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
578 | const BIGNUM *b, BN_CTX *ctx) | |
579 | { | |
580 | return EC_GROUP_set_curve(group, p, a, b, ctx); | |
581 | } | |
582 | ||
583 | int EC_GROUP_get_curve_GFp(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
584 | BIGNUM *b, BN_CTX *ctx) | |
585 | { | |
586 | return EC_GROUP_get_curve(group, p, a, b, ctx); | |
587 | } | |
588 | ||
50db8163 | 589 | # ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
590 | int EC_GROUP_set_curve_GF2m(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, |
591 | const BIGNUM *b, BN_CTX *ctx) | |
592 | { | |
8e3cced7 | 593 | return EC_GROUP_set_curve(group, p, a, b, ctx); |
0f113f3e MC |
594 | } |
595 | ||
596 | int EC_GROUP_get_curve_GF2m(const EC_GROUP *group, BIGNUM *p, BIGNUM *a, | |
597 | BIGNUM *b, BN_CTX *ctx) | |
598 | { | |
8e3cced7 | 599 | return EC_GROUP_get_curve(group, p, a, b, ctx); |
0f113f3e | 600 | } |
50db8163 | 601 | # endif |
b3310161 | 602 | #endif |
7793f30e BM |
603 | |
604 | int EC_GROUP_get_degree(const EC_GROUP *group) | |
0f113f3e MC |
605 | { |
606 | if (group->meth->group_get_degree == 0) { | |
9311d0c4 | 607 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
608 | return 0; |
609 | } | |
610 | return group->meth->group_get_degree(group); | |
611 | } | |
48fe4d62 | 612 | |
17d6bb81 | 613 | int EC_GROUP_check_discriminant(const EC_GROUP *group, BN_CTX *ctx) |
0f113f3e MC |
614 | { |
615 | if (group->meth->group_check_discriminant == 0) { | |
9311d0c4 | 616 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
617 | return 0; |
618 | } | |
619 | return group->meth->group_check_discriminant(group, ctx); | |
620 | } | |
af28dd6c | 621 | |
ada0e717 | 622 | int EC_GROUP_cmp(const EC_GROUP *a, const EC_GROUP *b, BN_CTX *ctx) |
0f113f3e MC |
623 | { |
624 | int r = 0; | |
625 | BIGNUM *a1, *a2, *a3, *b1, *b2, *b3; | |
f844f9eb | 626 | #ifndef FIPS_MODULE |
0f113f3e | 627 | BN_CTX *ctx_new = NULL; |
a9612d6c | 628 | #endif |
a9612d6c | 629 | |
0f113f3e | 630 | /* compare the field types */ |
23ccae80 | 631 | if (EC_GROUP_get_field_type(a) != EC_GROUP_get_field_type(b)) |
0f113f3e MC |
632 | return 1; |
633 | /* compare the curve name (if present in both) */ | |
634 | if (EC_GROUP_get_curve_name(a) && EC_GROUP_get_curve_name(b) && | |
635 | EC_GROUP_get_curve_name(a) != EC_GROUP_get_curve_name(b)) | |
636 | return 1; | |
6903e2e7 DSH |
637 | if (a->meth->flags & EC_FLAGS_CUSTOM_CURVE) |
638 | return 0; | |
0f113f3e | 639 | |
f844f9eb | 640 | #ifndef FIPS_MODULE |
0e8b6c97 AT |
641 | if (ctx == NULL) |
642 | ctx_new = ctx = BN_CTX_new(); | |
643 | #endif | |
644 | if (ctx == NULL) | |
645 | return -1; | |
646 | ||
0f113f3e MC |
647 | BN_CTX_start(ctx); |
648 | a1 = BN_CTX_get(ctx); | |
649 | a2 = BN_CTX_get(ctx); | |
650 | a3 = BN_CTX_get(ctx); | |
651 | b1 = BN_CTX_get(ctx); | |
652 | b2 = BN_CTX_get(ctx); | |
653 | b3 = BN_CTX_get(ctx); | |
90945fa3 | 654 | if (b3 == NULL) { |
0f113f3e | 655 | BN_CTX_end(ctx); |
f844f9eb | 656 | #ifndef FIPS_MODULE |
23a1d5e9 | 657 | BN_CTX_free(ctx_new); |
a9612d6c | 658 | #endif |
0f113f3e MC |
659 | return -1; |
660 | } | |
661 | ||
662 | /* | |
663 | * XXX This approach assumes that the external representation of curves | |
664 | * over the same field type is the same. | |
665 | */ | |
666 | if (!a->meth->group_get_curve(a, a1, a2, a3, ctx) || | |
667 | !b->meth->group_get_curve(b, b1, b2, b3, ctx)) | |
668 | r = 1; | |
669 | ||
8402cd5f SL |
670 | /* return 1 if the curve parameters are different */ |
671 | if (r || BN_cmp(a1, b1) != 0 || BN_cmp(a2, b2) != 0 || BN_cmp(a3, b3) != 0) | |
0f113f3e MC |
672 | r = 1; |
673 | ||
ac2b52c6 | 674 | /* XXX EC_POINT_cmp() assumes that the methods are equal */ |
8402cd5f | 675 | /* return 1 if the generators are different */ |
0f113f3e | 676 | if (r || EC_POINT_cmp(a, EC_GROUP_get0_generator(a), |
8402cd5f | 677 | EC_GROUP_get0_generator(b), ctx) != 0) |
0f113f3e MC |
678 | r = 1; |
679 | ||
680 | if (!r) { | |
be2e334f | 681 | const BIGNUM *ao, *bo, *ac, *bc; |
ac2b52c6 | 682 | /* compare the orders */ |
be2e334f DSH |
683 | ao = EC_GROUP_get0_order(a); |
684 | bo = EC_GROUP_get0_order(b); | |
be2e334f | 685 | if (ao == NULL || bo == NULL) { |
8402cd5f SL |
686 | /* return an error if either order is NULL */ |
687 | r = -1; | |
688 | goto end; | |
689 | } | |
690 | if (BN_cmp(ao, bo) != 0) { | |
691 | /* return 1 if orders are different */ | |
692 | r = 1; | |
693 | goto end; | |
0f113f3e | 694 | } |
8402cd5f SL |
695 | /* |
696 | * It gets here if the curve parameters and generator matched. | |
697 | * Now check the optional cofactors (if both are present). | |
698 | */ | |
699 | ac = EC_GROUP_get0_cofactor(a); | |
700 | bc = EC_GROUP_get0_cofactor(b); | |
701 | /* Returns 1 (mismatch) if both cofactors are specified and different */ | |
702 | if (!BN_is_zero(ac) && !BN_is_zero(bc) && BN_cmp(ac, bc) != 0) | |
0f113f3e | 703 | r = 1; |
8402cd5f | 704 | /* Returns 0 if the parameters matched */ |
0f113f3e | 705 | } |
8402cd5f | 706 | end: |
0f113f3e | 707 | BN_CTX_end(ctx); |
f844f9eb | 708 | #ifndef FIPS_MODULE |
23a1d5e9 | 709 | BN_CTX_free(ctx_new); |
a9612d6c | 710 | #endif |
0f113f3e MC |
711 | return r; |
712 | } | |
ada0e717 | 713 | |
0657bf9c BM |
714 | /* functions for EC_POINT objects */ |
715 | ||
716 | EC_POINT *EC_POINT_new(const EC_GROUP *group) | |
0f113f3e MC |
717 | { |
718 | EC_POINT *ret; | |
719 | ||
720 | if (group == NULL) { | |
9311d0c4 | 721 | ERR_raise(ERR_LIB_EC, ERR_R_PASSED_NULL_PARAMETER); |
0f113f3e MC |
722 | return NULL; |
723 | } | |
f06080cb | 724 | if (group->meth->point_init == NULL) { |
9311d0c4 | 725 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
726 | return NULL; |
727 | } | |
728 | ||
1b4cf96f | 729 | ret = OPENSSL_zalloc(sizeof(*ret)); |
e077455e | 730 | if (ret == NULL) |
0f113f3e | 731 | return NULL; |
0f113f3e MC |
732 | |
733 | ret->meth = group->meth; | |
b14e6015 | 734 | ret->curve_name = group->curve_name; |
0f113f3e MC |
735 | |
736 | if (!ret->meth->point_init(ret)) { | |
737 | OPENSSL_free(ret); | |
738 | return NULL; | |
739 | } | |
740 | ||
741 | return ret; | |
742 | } | |
0657bf9c BM |
743 | |
744 | void EC_POINT_free(EC_POINT *point) | |
0f113f3e | 745 | { |
12a765a5 | 746 | if (point == NULL) |
0f113f3e | 747 | return; |
7711de24 | 748 | |
0f113f3e MC |
749 | if (point->meth->point_finish != 0) |
750 | point->meth->point_finish(point); | |
751 | OPENSSL_free(point); | |
752 | } | |
0657bf9c BM |
753 | |
754 | void EC_POINT_clear_free(EC_POINT *point) | |
0f113f3e | 755 | { |
12a765a5 | 756 | if (point == NULL) |
0f113f3e MC |
757 | return; |
758 | ||
759 | if (point->meth->point_clear_finish != 0) | |
760 | point->meth->point_clear_finish(point); | |
761 | else if (point->meth->point_finish != 0) | |
762 | point->meth->point_finish(point); | |
b4faea50 | 763 | OPENSSL_clear_free(point, sizeof(*point)); |
0f113f3e | 764 | } |
0657bf9c BM |
765 | |
766 | int EC_POINT_copy(EC_POINT *dest, const EC_POINT *src) | |
0f113f3e MC |
767 | { |
768 | if (dest->meth->point_copy == 0) { | |
9311d0c4 | 769 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
770 | return 0; |
771 | } | |
b14e6015 MC |
772 | if (dest->meth != src->meth |
773 | || (dest->curve_name != src->curve_name | |
8402cd5f SL |
774 | && dest->curve_name != 0 |
775 | && src->curve_name != 0)) { | |
9311d0c4 | 776 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
777 | return 0; |
778 | } | |
779 | if (dest == src) | |
780 | return 1; | |
781 | return dest->meth->point_copy(dest, src); | |
782 | } | |
0657bf9c | 783 | |
7793f30e | 784 | EC_POINT *EC_POINT_dup(const EC_POINT *a, const EC_GROUP *group) |
0f113f3e MC |
785 | { |
786 | EC_POINT *t; | |
787 | int r; | |
788 | ||
789 | if (a == NULL) | |
790 | return NULL; | |
791 | ||
792 | t = EC_POINT_new(group); | |
793 | if (t == NULL) | |
26a7d938 | 794 | return NULL; |
0f113f3e MC |
795 | r = EC_POINT_copy(t, a); |
796 | if (!r) { | |
797 | EC_POINT_free(t); | |
798 | return NULL; | |
8fdc3734 RS |
799 | } |
800 | return t; | |
0f113f3e | 801 | } |
7793f30e | 802 | |
23ccae80 | 803 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
48fe4d62 | 804 | const EC_METHOD *EC_POINT_method_of(const EC_POINT *point) |
0f113f3e MC |
805 | { |
806 | return point->meth; | |
807 | } | |
23ccae80 | 808 | #endif |
48fe4d62 | 809 | |
226cc7de | 810 | int EC_POINT_set_to_infinity(const EC_GROUP *group, EC_POINT *point) |
0f113f3e MC |
811 | { |
812 | if (group->meth->point_set_to_infinity == 0) { | |
9311d0c4 | 813 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
814 | return 0; |
815 | } | |
816 | if (group->meth != point->meth) { | |
9311d0c4 | 817 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
818 | return 0; |
819 | } | |
820 | return group->meth->point_set_to_infinity(group, point); | |
821 | } | |
822 | ||
07caec83 | 823 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
0f113f3e MC |
824 | int EC_POINT_set_Jprojective_coordinates_GFp(const EC_GROUP *group, |
825 | EC_POINT *point, const BIGNUM *x, | |
826 | const BIGNUM *y, const BIGNUM *z, | |
827 | BN_CTX *ctx) | |
828 | { | |
07caec83 | 829 | if (group->meth->field_type != NID_X9_62_prime_field) { |
9311d0c4 | 830 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
831 | return 0; |
832 | } | |
b14e6015 | 833 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 834 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
835 | return 0; |
836 | } | |
32ab57cb SL |
837 | return ossl_ec_GFp_simple_set_Jprojective_coordinates_GFp(group, point, |
838 | x, y, z, ctx); | |
0f113f3e MC |
839 | } |
840 | ||
841 | int EC_POINT_get_Jprojective_coordinates_GFp(const EC_GROUP *group, | |
842 | const EC_POINT *point, BIGNUM *x, | |
843 | BIGNUM *y, BIGNUM *z, | |
844 | BN_CTX *ctx) | |
845 | { | |
07caec83 | 846 | if (group->meth->field_type != NID_X9_62_prime_field) { |
9311d0c4 | 847 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
848 | return 0; |
849 | } | |
b14e6015 | 850 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 851 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
852 | return 0; |
853 | } | |
32ab57cb SL |
854 | return ossl_ec_GFp_simple_get_Jprojective_coordinates_GFp(group, point, |
855 | x, y, z, ctx); | |
0f113f3e | 856 | } |
07caec83 | 857 | #endif |
0f113f3e | 858 | |
8e3cced7 MC |
859 | int EC_POINT_set_affine_coordinates(const EC_GROUP *group, EC_POINT *point, |
860 | const BIGNUM *x, const BIGNUM *y, | |
861 | BN_CTX *ctx) | |
0f113f3e | 862 | { |
8e3cced7 | 863 | if (group->meth->point_set_affine_coordinates == NULL) { |
9311d0c4 | 864 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
865 | return 0; |
866 | } | |
b14e6015 | 867 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 868 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
869 | return 0; |
870 | } | |
1e2012b7 EK |
871 | if (!group->meth->point_set_affine_coordinates(group, point, x, y, ctx)) |
872 | return 0; | |
873 | ||
874 | if (EC_POINT_is_on_curve(group, point, ctx) <= 0) { | |
9311d0c4 | 875 | ERR_raise(ERR_LIB_EC, EC_R_POINT_IS_NOT_ON_CURVE); |
1e2012b7 EK |
876 | return 0; |
877 | } | |
878 | return 1; | |
0f113f3e | 879 | } |
226cc7de | 880 | |
936c2b9e | 881 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
8e3cced7 MC |
882 | int EC_POINT_set_affine_coordinates_GFp(const EC_GROUP *group, |
883 | EC_POINT *point, const BIGNUM *x, | |
884 | const BIGNUM *y, BN_CTX *ctx) | |
885 | { | |
886 | return EC_POINT_set_affine_coordinates(group, point, x, y, ctx); | |
887 | } | |
888 | ||
50db8163 | 889 | # ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
890 | int EC_POINT_set_affine_coordinates_GF2m(const EC_GROUP *group, |
891 | EC_POINT *point, const BIGNUM *x, | |
892 | const BIGNUM *y, BN_CTX *ctx) | |
893 | { | |
8e3cced7 MC |
894 | return EC_POINT_set_affine_coordinates(group, point, x, y, ctx); |
895 | } | |
50db8163 | 896 | # endif |
8e3cced7 MC |
897 | #endif |
898 | ||
899 | int EC_POINT_get_affine_coordinates(const EC_GROUP *group, | |
900 | const EC_POINT *point, BIGNUM *x, BIGNUM *y, | |
901 | BN_CTX *ctx) | |
902 | { | |
903 | if (group->meth->point_get_affine_coordinates == NULL) { | |
9311d0c4 | 904 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
905 | return 0; |
906 | } | |
b14e6015 | 907 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 908 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
1e2012b7 EK |
909 | return 0; |
910 | } | |
bfb10b97 | 911 | if (EC_POINT_is_at_infinity(group, point)) { |
9311d0c4 | 912 | ERR_raise(ERR_LIB_EC, EC_R_POINT_AT_INFINITY); |
bfb10b97 BB |
913 | return 0; |
914 | } | |
8e3cced7 | 915 | return group->meth->point_get_affine_coordinates(group, point, x, y, ctx); |
0f113f3e | 916 | } |
7793f30e | 917 | |
936c2b9e | 918 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
0f113f3e MC |
919 | int EC_POINT_get_affine_coordinates_GFp(const EC_GROUP *group, |
920 | const EC_POINT *point, BIGNUM *x, | |
921 | BIGNUM *y, BN_CTX *ctx) | |
922 | { | |
8e3cced7 | 923 | return EC_POINT_get_affine_coordinates(group, point, x, y, ctx); |
0f113f3e | 924 | } |
7793f30e | 925 | |
50db8163 | 926 | # ifndef OPENSSL_NO_EC2M |
0f113f3e MC |
927 | int EC_POINT_get_affine_coordinates_GF2m(const EC_GROUP *group, |
928 | const EC_POINT *point, BIGNUM *x, | |
929 | BIGNUM *y, BN_CTX *ctx) | |
930 | { | |
8e3cced7 | 931 | return EC_POINT_get_affine_coordinates(group, point, x, y, ctx); |
0f113f3e | 932 | } |
50db8163 | 933 | # endif |
b3310161 | 934 | #endif |
7793f30e | 935 | |
0f113f3e MC |
936 | int EC_POINT_add(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, |
937 | const EC_POINT *b, BN_CTX *ctx) | |
938 | { | |
939 | if (group->meth->add == 0) { | |
9311d0c4 | 940 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
941 | return 0; |
942 | } | |
b14e6015 MC |
943 | if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group) |
944 | || !ec_point_is_compat(b, group)) { | |
9311d0c4 | 945 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
946 | return 0; |
947 | } | |
948 | return group->meth->add(group, r, a, b, ctx); | |
949 | } | |
950 | ||
951 | int EC_POINT_dbl(const EC_GROUP *group, EC_POINT *r, const EC_POINT *a, | |
952 | BN_CTX *ctx) | |
953 | { | |
954 | if (group->meth->dbl == 0) { | |
9311d0c4 | 955 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
956 | return 0; |
957 | } | |
b14e6015 | 958 | if (!ec_point_is_compat(r, group) || !ec_point_is_compat(a, group)) { |
9311d0c4 | 959 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
960 | return 0; |
961 | } | |
962 | return group->meth->dbl(group, r, a, ctx); | |
963 | } | |
0657bf9c | 964 | |
1d5bd6cf | 965 | int EC_POINT_invert(const EC_GROUP *group, EC_POINT *a, BN_CTX *ctx) |
0f113f3e MC |
966 | { |
967 | if (group->meth->invert == 0) { | |
9311d0c4 | 968 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
969 | return 0; |
970 | } | |
b14e6015 | 971 | if (!ec_point_is_compat(a, group)) { |
9311d0c4 | 972 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
973 | return 0; |
974 | } | |
975 | return group->meth->invert(group, a, ctx); | |
976 | } | |
1d5bd6cf | 977 | |
0657bf9c | 978 | int EC_POINT_is_at_infinity(const EC_GROUP *group, const EC_POINT *point) |
0f113f3e MC |
979 | { |
980 | if (group->meth->is_at_infinity == 0) { | |
9311d0c4 | 981 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
982 | return 0; |
983 | } | |
b14e6015 | 984 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 985 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
986 | return 0; |
987 | } | |
988 | return group->meth->is_at_infinity(group, point); | |
989 | } | |
990 | ||
68886be7 MC |
991 | /* |
992 | * Check whether an EC_POINT is on the curve or not. Note that the return | |
993 | * value for this function should NOT be treated as a boolean. Return values: | |
994 | * 1: The point is on the curve | |
995 | * 0: The point is not on the curve | |
996 | * -1: An error occurred | |
997 | */ | |
0f113f3e MC |
998 | int EC_POINT_is_on_curve(const EC_GROUP *group, const EC_POINT *point, |
999 | BN_CTX *ctx) | |
1000 | { | |
1001 | if (group->meth->is_on_curve == 0) { | |
9311d0c4 | 1002 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
1003 | return 0; |
1004 | } | |
b14e6015 | 1005 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 1006 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
1007 | return 0; |
1008 | } | |
1009 | return group->meth->is_on_curve(group, point, ctx); | |
1010 | } | |
1011 | ||
1012 | int EC_POINT_cmp(const EC_GROUP *group, const EC_POINT *a, const EC_POINT *b, | |
1013 | BN_CTX *ctx) | |
1014 | { | |
1015 | if (group->meth->point_cmp == 0) { | |
9311d0c4 | 1016 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
1017 | return -1; |
1018 | } | |
b14e6015 | 1019 | if (!ec_point_is_compat(a, group) || !ec_point_is_compat(b, group)) { |
9311d0c4 | 1020 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
1021 | return -1; |
1022 | } | |
1023 | return group->meth->point_cmp(group, a, b, ctx); | |
1024 | } | |
1d5bd6cf | 1025 | |
c2f2db9b | 1026 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
e869d4bd | 1027 | int EC_POINT_make_affine(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx) |
0f113f3e MC |
1028 | { |
1029 | if (group->meth->make_affine == 0) { | |
9311d0c4 | 1030 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
1031 | return 0; |
1032 | } | |
b14e6015 | 1033 | if (!ec_point_is_compat(point, group)) { |
9311d0c4 | 1034 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
1035 | return 0; |
1036 | } | |
1037 | return group->meth->make_affine(group, point, ctx); | |
1038 | } | |
1039 | ||
1040 | int EC_POINTs_make_affine(const EC_GROUP *group, size_t num, | |
1041 | EC_POINT *points[], BN_CTX *ctx) | |
1042 | { | |
1043 | size_t i; | |
1044 | ||
1045 | if (group->meth->points_make_affine == 0) { | |
9311d0c4 | 1046 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
0f113f3e MC |
1047 | return 0; |
1048 | } | |
1049 | for (i = 0; i < num; i++) { | |
b14e6015 | 1050 | if (!ec_point_is_compat(points[i], group)) { |
9311d0c4 | 1051 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
0f113f3e MC |
1052 | return 0; |
1053 | } | |
1054 | } | |
1055 | return group->meth->points_make_affine(group, num, points, ctx); | |
1056 | } | |
c2f2db9b | 1057 | #endif |
0f113f3e MC |
1058 | |
1059 | /* | |
1060 | * Functions for point multiplication. If group->meth->mul is 0, we use the | |
1061 | * wNAF-based implementations in ec_mult.c; otherwise we dispatch through | |
1062 | * methods. | |
37c660ff BM |
1063 | */ |
1064 | ||
4fcd15c1 | 1065 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
37c660ff | 1066 | int EC_POINTs_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar, |
0f113f3e MC |
1067 | size_t num, const EC_POINT *points[], |
1068 | const BIGNUM *scalars[], BN_CTX *ctx) | |
1069 | { | |
01ad66f8 NT |
1070 | int ret = 0; |
1071 | size_t i = 0; | |
f844f9eb | 1072 | #ifndef FIPS_MODULE |
01ad66f8 | 1073 | BN_CTX *new_ctx = NULL; |
a9612d6c | 1074 | #endif |
a9612d6c | 1075 | |
01ad66f8 | 1076 | if (!ec_point_is_compat(r, group)) { |
9311d0c4 | 1077 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
01ad66f8 NT |
1078 | return 0; |
1079 | } | |
1eb9b54a BE |
1080 | |
1081 | if (scalar == NULL && num == 0) | |
1082 | return EC_POINT_set_to_infinity(group, r); | |
1083 | ||
01ad66f8 NT |
1084 | for (i = 0; i < num; i++) { |
1085 | if (!ec_point_is_compat(points[i], group)) { | |
9311d0c4 | 1086 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
01ad66f8 NT |
1087 | return 0; |
1088 | } | |
1089 | } | |
1090 | ||
f844f9eb | 1091 | #ifndef FIPS_MODULE |
0e8b6c97 AT |
1092 | if (ctx == NULL) |
1093 | ctx = new_ctx = BN_CTX_secure_new(); | |
1094 | #endif | |
1095 | if (ctx == NULL) { | |
9311d0c4 | 1096 | ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR); |
0e8b6c97 AT |
1097 | return 0; |
1098 | } | |
1099 | ||
01ad66f8 NT |
1100 | if (group->meth->mul != NULL) |
1101 | ret = group->meth->mul(group, r, scalar, num, points, scalars, ctx); | |
1102 | else | |
0f113f3e | 1103 | /* use default */ |
32ab57cb | 1104 | ret = ossl_ec_wNAF_mul(group, r, scalar, num, points, scalars, ctx); |
37c660ff | 1105 | |
f844f9eb | 1106 | #ifndef FIPS_MODULE |
01ad66f8 | 1107 | BN_CTX_free(new_ctx); |
a9612d6c | 1108 | #endif |
01ad66f8 | 1109 | return ret; |
0f113f3e | 1110 | } |
4fcd15c1 | 1111 | #endif |
37c660ff BM |
1112 | |
1113 | int EC_POINT_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *g_scalar, | |
0f113f3e MC |
1114 | const EC_POINT *point, const BIGNUM *p_scalar, BN_CTX *ctx) |
1115 | { | |
4fcd15c1 | 1116 | int ret = 0; |
9c47a338 | 1117 | size_t num; |
4fcd15c1 BB |
1118 | #ifndef FIPS_MODULE |
1119 | BN_CTX *new_ctx = NULL; | |
1120 | #endif | |
37c660ff | 1121 | |
4fcd15c1 BB |
1122 | if (!ec_point_is_compat(r, group) |
1123 | || (point != NULL && !ec_point_is_compat(point, group))) { | |
9311d0c4 | 1124 | ERR_raise(ERR_LIB_EC, EC_R_INCOMPATIBLE_OBJECTS); |
4fcd15c1 BB |
1125 | return 0; |
1126 | } | |
37c660ff | 1127 | |
4fcd15c1 BB |
1128 | if (g_scalar == NULL && p_scalar == NULL) |
1129 | return EC_POINT_set_to_infinity(group, r); | |
37c660ff | 1130 | |
4fcd15c1 BB |
1131 | #ifndef FIPS_MODULE |
1132 | if (ctx == NULL) | |
1133 | ctx = new_ctx = BN_CTX_secure_new(); | |
1134 | #endif | |
1135 | if (ctx == NULL) { | |
9311d0c4 | 1136 | ERR_raise(ERR_LIB_EC, ERR_R_INTERNAL_ERROR); |
4fcd15c1 BB |
1137 | return 0; |
1138 | } | |
1139 | ||
9c47a338 | 1140 | num = (point != NULL && p_scalar != NULL) ? 1 : 0; |
4fcd15c1 | 1141 | if (group->meth->mul != NULL) |
9c47a338 | 1142 | ret = group->meth->mul(group, r, g_scalar, num, &point, &p_scalar, ctx); |
4fcd15c1 BB |
1143 | else |
1144 | /* use default */ | |
32ab57cb | 1145 | ret = ossl_ec_wNAF_mul(group, r, g_scalar, num, &point, &p_scalar, ctx); |
4fcd15c1 BB |
1146 | |
1147 | #ifndef FIPS_MODULE | |
1148 | BN_CTX_free(new_ctx); | |
1149 | #endif | |
1150 | return ret; | |
0f113f3e | 1151 | } |
37c660ff | 1152 | |
6b4eb933 | 1153 | #ifndef OPENSSL_NO_DEPRECATED_3_0 |
37c660ff | 1154 | int EC_GROUP_precompute_mult(EC_GROUP *group, BN_CTX *ctx) |
0f113f3e MC |
1155 | { |
1156 | if (group->meth->mul == 0) | |
1157 | /* use default */ | |
32ab57cb | 1158 | return ossl_ec_wNAF_precompute_mult(group, ctx); |
37c660ff | 1159 | |
0f113f3e MC |
1160 | if (group->meth->precompute_mult != 0) |
1161 | return group->meth->precompute_mult(group, ctx); | |
1162 | else | |
1163 | return 1; /* nothing to do, so report success */ | |
1164 | } | |
37c660ff BM |
1165 | |
1166 | int EC_GROUP_have_precompute_mult(const EC_GROUP *group) | |
0f113f3e MC |
1167 | { |
1168 | if (group->meth->mul == 0) | |
1169 | /* use default */ | |
32ab57cb | 1170 | return ossl_ec_wNAF_have_precompute_mult(group); |
0f113f3e MC |
1171 | |
1172 | if (group->meth->have_precompute_mult != 0) | |
1173 | return group->meth->have_precompute_mult(group); | |
1174 | else | |
1175 | return 0; /* cannot tell whether precomputation has | |
1176 | * been performed */ | |
1177 | } | |
6b4eb933 | 1178 | #endif |
0f113f3e MC |
1179 | |
1180 | /* | |
1181 | * ec_precompute_mont_data sets |group->mont_data| from |group->order| and | |
1182 | * returns one on success. On error it returns zero. | |
1183 | */ | |
eb791696 | 1184 | static int ec_precompute_mont_data(EC_GROUP *group) |
0f113f3e | 1185 | { |
a9612d6c | 1186 | BN_CTX *ctx = BN_CTX_new_ex(group->libctx); |
0f113f3e MC |
1187 | int ret = 0; |
1188 | ||
23a1d5e9 RS |
1189 | BN_MONT_CTX_free(group->mont_data); |
1190 | group->mont_data = NULL; | |
0f113f3e MC |
1191 | |
1192 | if (ctx == NULL) | |
1193 | goto err; | |
1194 | ||
1195 | group->mont_data = BN_MONT_CTX_new(); | |
90945fa3 | 1196 | if (group->mont_data == NULL) |
0f113f3e MC |
1197 | goto err; |
1198 | ||
1199 | if (!BN_MONT_CTX_set(group->mont_data, group->order, ctx)) { | |
1200 | BN_MONT_CTX_free(group->mont_data); | |
1201 | group->mont_data = NULL; | |
1202 | goto err; | |
1203 | } | |
1204 | ||
1205 | ret = 1; | |
1206 | ||
1207 | err: | |
1208 | ||
23a1d5e9 | 1209 | BN_CTX_free(ctx); |
0f113f3e MC |
1210 | return ret; |
1211 | } | |
3aef36ff | 1212 | |
f844f9eb | 1213 | #ifndef FIPS_MODULE |
3aef36ff RS |
1214 | int EC_KEY_set_ex_data(EC_KEY *key, int idx, void *arg) |
1215 | { | |
1216 | return CRYPTO_set_ex_data(&key->ex_data, idx, arg); | |
1217 | } | |
1218 | ||
1219 | void *EC_KEY_get_ex_data(const EC_KEY *key, int idx) | |
1220 | { | |
1221 | return CRYPTO_get_ex_data(&key->ex_data, idx); | |
1222 | } | |
a9612d6c | 1223 | #endif |
77470e98 | 1224 | |
32ab57cb | 1225 | int ossl_ec_group_simple_order_bits(const EC_GROUP *group) |
77470e98 DSH |
1226 | { |
1227 | if (group->order == NULL) | |
1228 | return 0; | |
1229 | return BN_num_bits(group->order); | |
1230 | } | |
eb791696 | 1231 | |
c11d372b | 1232 | static int ec_field_inverse_mod_ord(const EC_GROUP *group, BIGNUM *r, |
792546eb | 1233 | const BIGNUM *x, BN_CTX *ctx) |
c11d372b | 1234 | { |
262dccc0 | 1235 | BIGNUM *e = NULL; |
c11d372b | 1236 | int ret = 0; |
f844f9eb | 1237 | #ifndef FIPS_MODULE |
a9612d6c | 1238 | BN_CTX *new_ctx = NULL; |
0e8b6c97 AT |
1239 | #endif |
1240 | ||
1241 | if (group->mont_data == NULL) | |
1242 | return 0; | |
c11d372b | 1243 | |
f844f9eb | 1244 | #ifndef FIPS_MODULE |
a9612d6c MC |
1245 | if (ctx == NULL) |
1246 | ctx = new_ctx = BN_CTX_secure_new(); | |
1247 | #endif | |
1248 | if (ctx == NULL) | |
792546eb BB |
1249 | return 0; |
1250 | ||
c11d372b | 1251 | BN_CTX_start(ctx); |
262dccc0 | 1252 | if ((e = BN_CTX_get(ctx)) == NULL) |
c11d372b BB |
1253 | goto err; |
1254 | ||
792546eb BB |
1255 | /*- |
1256 | * We want inverse in constant time, therefore we utilize the fact | |
1257 | * order must be prime and use Fermats Little Theorem instead. | |
1258 | */ | |
1259 | if (!BN_set_word(e, 2)) | |
1260 | goto err; | |
1261 | if (!BN_sub(e, group->order, e)) | |
1262 | goto err; | |
1263 | /*- | |
1264 | * Exponent e is public. | |
1265 | * No need for scatter-gather or BN_FLG_CONSTTIME. | |
1266 | */ | |
1267 | if (!BN_mod_exp_mont(r, x, e, group->order, ctx, group->mont_data)) | |
1268 | goto err; | |
c11d372b | 1269 | |
792546eb | 1270 | ret = 1; |
c11d372b BB |
1271 | |
1272 | err: | |
ce1415ed | 1273 | BN_CTX_end(ctx); |
f844f9eb | 1274 | #ifndef FIPS_MODULE |
c11d372b | 1275 | BN_CTX_free(new_ctx); |
a9612d6c | 1276 | #endif |
c11d372b BB |
1277 | return ret; |
1278 | } | |
1279 | ||
792546eb BB |
1280 | /*- |
1281 | * Default behavior, if group->meth->field_inverse_mod_ord is NULL: | |
1282 | * - When group->order is even, this function returns an error. | |
1283 | * - When group->order is otherwise composite, the correctness | |
1284 | * of the output is not guaranteed. | |
1285 | * - When x is outside the range [1, group->order), the correctness | |
1286 | * of the output is not guaranteed. | |
1287 | * - Otherwise, this function returns the multiplicative inverse in the | |
1288 | * range [1, group->order). | |
1289 | * | |
1290 | * EC_METHODs must implement their own field_inverse_mod_ord for | |
1291 | * other functionality. | |
1292 | */ | |
32ab57cb SL |
1293 | int ossl_ec_group_do_inverse_ord(const EC_GROUP *group, BIGNUM *res, |
1294 | const BIGNUM *x, BN_CTX *ctx) | |
eb791696 AP |
1295 | { |
1296 | if (group->meth->field_inverse_mod_ord != NULL) | |
1297 | return group->meth->field_inverse_mod_ord(group, res, x, ctx); | |
1298 | else | |
c11d372b | 1299 | return ec_field_inverse_mod_ord(group, res, x, ctx); |
eb791696 | 1300 | } |
f667820c SH |
1301 | |
1302 | /*- | |
1303 | * Coordinate blinding for EC_POINT. | |
1304 | * | |
1305 | * The underlying EC_METHOD can optionally implement this function: | |
1306 | * underlying implementations should return 0 on errors, or 1 on | |
1307 | * success. | |
1308 | * | |
1309 | * This wrapper returns 1 in case the underlying EC_METHOD does not | |
1310 | * support coordinate blinding. | |
1311 | */ | |
32ab57cb SL |
1312 | int ossl_ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, |
1313 | BN_CTX *ctx) | |
f667820c SH |
1314 | { |
1315 | if (group->meth->blind_coordinates == NULL) | |
1316 | return 1; /* ignore if not implemented */ | |
1317 | ||
1318 | return group->meth->blind_coordinates(group, p, ctx); | |
1319 | } | |
c0f39ded SL |
1320 | |
1321 | int EC_GROUP_get_basis_type(const EC_GROUP *group) | |
1322 | { | |
1323 | int i; | |
1324 | ||
1325 | if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field) | |
1326 | /* everything else is currently not supported */ | |
1327 | return 0; | |
1328 | ||
1329 | /* Find the last non-zero element of group->poly[] */ | |
1330 | for (i = 0; | |
1331 | i < (int)OSSL_NELEM(group->poly) && group->poly[i] != 0; | |
1332 | i++) | |
1333 | continue; | |
1334 | ||
1335 | if (i == 4) | |
1336 | return NID_X9_62_ppBasis; | |
1337 | else if (i == 2) | |
1338 | return NID_X9_62_tpBasis; | |
1339 | else | |
1340 | /* everything else is currently not supported */ | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | #ifndef OPENSSL_NO_EC2M | |
1345 | int EC_GROUP_get_trinomial_basis(const EC_GROUP *group, unsigned int *k) | |
1346 | { | |
1347 | if (group == NULL) | |
1348 | return 0; | |
1349 | ||
1350 | if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field | |
1351 | || !((group->poly[0] != 0) && (group->poly[1] != 0) | |
1352 | && (group->poly[2] == 0))) { | |
9311d0c4 | 1353 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
c0f39ded SL |
1354 | return 0; |
1355 | } | |
1356 | ||
1357 | if (k) | |
1358 | *k = group->poly[1]; | |
1359 | ||
1360 | return 1; | |
1361 | } | |
1362 | ||
1363 | int EC_GROUP_get_pentanomial_basis(const EC_GROUP *group, unsigned int *k1, | |
1364 | unsigned int *k2, unsigned int *k3) | |
1365 | { | |
1366 | if (group == NULL) | |
1367 | return 0; | |
1368 | ||
1369 | if (EC_GROUP_get_field_type(group) != NID_X9_62_characteristic_two_field | |
1370 | || !((group->poly[0] != 0) && (group->poly[1] != 0) | |
1371 | && (group->poly[2] != 0) && (group->poly[3] != 0) | |
1372 | && (group->poly[4] == 0))) { | |
9311d0c4 | 1373 | ERR_raise(ERR_LIB_EC, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED); |
c0f39ded SL |
1374 | return 0; |
1375 | } | |
1376 | ||
1377 | if (k1) | |
1378 | *k1 = group->poly[3]; | |
1379 | if (k2) | |
1380 | *k2 = group->poly[2]; | |
1381 | if (k3) | |
1382 | *k3 = group->poly[1]; | |
1383 | ||
1384 | return 1; | |
1385 | } | |
1386 | #endif | |
1387 | ||
638c3a28 | 1388 | #ifndef FIPS_MODULE |
c0f39ded SL |
1389 | /* |
1390 | * Check if the explicit parameters group matches any built-in curves. | |
1391 | * | |
1392 | * We create a copy of the group just built, so that we can remove optional | |
1393 | * fields for the lookup: we do this to avoid the possibility that one of | |
1394 | * the optional parameters is used to force the library into using a less | |
1395 | * performant and less secure EC_METHOD instead of the specialized one. | |
1396 | * In any case, `seed` is not really used in any computation, while a | |
1397 | * cofactor different from the one in the built-in table is just | |
1398 | * mathematically wrong anyway and should not be used. | |
1399 | */ | |
1400 | static EC_GROUP *ec_group_explicit_to_named(const EC_GROUP *group, | |
b4250010 | 1401 | OSSL_LIB_CTX *libctx, |
c0f39ded SL |
1402 | const char *propq, |
1403 | BN_CTX *ctx) | |
1404 | { | |
1405 | EC_GROUP *ret_group = NULL, *dup = NULL; | |
1406 | int curve_name_nid; | |
1407 | ||
1408 | const EC_POINT *point = EC_GROUP_get0_generator(group); | |
1409 | const BIGNUM *order = EC_GROUP_get0_order(group); | |
1410 | int no_seed = (EC_GROUP_get0_seed(group) == NULL); | |
1411 | ||
1412 | if ((dup = EC_GROUP_dup(group)) == NULL | |
1413 | || EC_GROUP_set_seed(dup, NULL, 0) != 1 | |
1414 | || !EC_GROUP_set_generator(dup, point, order, NULL)) | |
1415 | goto err; | |
32ab57cb | 1416 | if ((curve_name_nid = ossl_ec_curve_nid_from_params(dup, ctx)) != NID_undef) { |
c0f39ded SL |
1417 | /* |
1418 | * The input explicit parameters successfully matched one of the | |
1419 | * built-in curves: often for built-in curves we have specialized | |
1420 | * methods with better performance and hardening. | |
1421 | * | |
1422 | * In this case we replace the `EC_GROUP` created through explicit | |
1423 | * parameters with one created from a named group. | |
1424 | */ | |
1425 | ||
638c3a28 | 1426 | # ifndef OPENSSL_NO_EC_NISTP_64_GCC_128 |
c0f39ded SL |
1427 | /* |
1428 | * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for | |
1429 | * the same curve, we prefer the SECP nid when matching explicit | |
1430 | * parameters as that is associated with a specialized EC_METHOD. | |
1431 | */ | |
1432 | if (curve_name_nid == NID_wap_wsg_idm_ecid_wtls12) | |
1433 | curve_name_nid = NID_secp224r1; | |
638c3a28 | 1434 | # endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */ |
c0f39ded | 1435 | |
d8652be0 | 1436 | ret_group = EC_GROUP_new_by_curve_name_ex(libctx, propq, curve_name_nid); |
c0f39ded SL |
1437 | if (ret_group == NULL) |
1438 | goto err; | |
1439 | ||
1440 | /* | |
1441 | * Set the flag so that EC_GROUPs created from explicit parameters are | |
1442 | * serialized using explicit parameters by default. | |
1443 | */ | |
1444 | EC_GROUP_set_asn1_flag(ret_group, OPENSSL_EC_EXPLICIT_CURVE); | |
1445 | ||
1446 | /* | |
1447 | * If the input params do not contain the optional seed field we make | |
1448 | * sure it is not added to the returned group. | |
1449 | * | |
1450 | * The seed field is not really used inside libcrypto anyway, and | |
1451 | * adding it to parsed explicit parameter keys would alter their DER | |
1452 | * encoding output (because of the extra field) which could impact | |
1453 | * applications fingerprinting keys by their DER encoding. | |
1454 | */ | |
1455 | if (no_seed) { | |
1456 | if (EC_GROUP_set_seed(ret_group, NULL, 0) != 1) | |
1457 | goto err; | |
1458 | } | |
1459 | } else { | |
1460 | ret_group = (EC_GROUP *)group; | |
1461 | } | |
1462 | EC_GROUP_free(dup); | |
1463 | return ret_group; | |
1464 | err: | |
1465 | EC_GROUP_free(dup); | |
1466 | EC_GROUP_free(ret_group); | |
1467 | return NULL; | |
1468 | } | |
638c3a28 | 1469 | #endif /* FIPS_MODULE */ |
c0f39ded | 1470 | |
c0f39ded | 1471 | static EC_GROUP *group_new_from_name(const OSSL_PARAM *p, |
b4250010 | 1472 | OSSL_LIB_CTX *libctx, const char *propq) |
c0f39ded SL |
1473 | { |
1474 | int ok = 0, nid; | |
1475 | const char *curve_name = NULL; | |
1476 | ||
1477 | switch (p->data_type) { | |
1478 | case OSSL_PARAM_UTF8_STRING: | |
1479 | /* The OSSL_PARAM functions have no support for this */ | |
1480 | curve_name = p->data; | |
1481 | ok = (curve_name != NULL); | |
1482 | break; | |
1483 | case OSSL_PARAM_UTF8_PTR: | |
1484 | ok = OSSL_PARAM_get_utf8_ptr(p, &curve_name); | |
1485 | break; | |
1486 | } | |
1487 | ||
1488 | if (ok) { | |
32ab57cb | 1489 | nid = ossl_ec_curve_name2nid(curve_name); |
c0f39ded | 1490 | if (nid == NID_undef) { |
9311d0c4 | 1491 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_CURVE); |
c0f39ded SL |
1492 | return NULL; |
1493 | } else { | |
d8652be0 | 1494 | return EC_GROUP_new_by_curve_name_ex(libctx, propq, nid); |
c0f39ded SL |
1495 | } |
1496 | } | |
1497 | return NULL; | |
1498 | } | |
1499 | ||
5b5eea4b | 1500 | /* These parameters can be set directly into an EC_GROUP */ |
32ab57cb | 1501 | int ossl_ec_group_set_params(EC_GROUP *group, const OSSL_PARAM params[]) |
5b5eea4b SL |
1502 | { |
1503 | int encoding_flag = -1, format = -1; | |
1504 | const OSSL_PARAM *p; | |
1505 | ||
1506 | p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_POINT_CONVERSION_FORMAT); | |
1507 | if (p != NULL) { | |
32ab57cb | 1508 | if (!ossl_ec_pt_format_param2id(p, &format)) { |
bd07cc1c | 1509 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM); |
5b5eea4b SL |
1510 | return 0; |
1511 | } | |
1512 | EC_GROUP_set_point_conversion_form(group, format); | |
1513 | } | |
1514 | ||
1515 | p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ENCODING); | |
1516 | if (p != NULL) { | |
32ab57cb | 1517 | if (!ossl_ec_encoding_param2id(p, &encoding_flag)) { |
bd07cc1c | 1518 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_FORM); |
5b5eea4b SL |
1519 | return 0; |
1520 | } | |
1521 | EC_GROUP_set_asn1_flag(group, encoding_flag); | |
1522 | } | |
1523 | /* Optional seed */ | |
1524 | p = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED); | |
1525 | if (p != NULL) { | |
1526 | /* The seed is allowed to be NULL */ | |
1527 | if (p->data_type != OSSL_PARAM_OCTET_STRING | |
1528 | || !EC_GROUP_set_seed(group, p->data, p->data_size)) { | |
bd07cc1c | 1529 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_SEED); |
5b5eea4b SL |
1530 | return 0; |
1531 | } | |
1532 | } | |
1533 | return 1; | |
1534 | } | |
1535 | ||
c0f39ded | 1536 | EC_GROUP *EC_GROUP_new_from_params(const OSSL_PARAM params[], |
b4250010 | 1537 | OSSL_LIB_CTX *libctx, const char *propq) |
c0f39ded | 1538 | { |
638c3a28 TM |
1539 | const OSSL_PARAM *ptmp; |
1540 | EC_GROUP *group = NULL; | |
1541 | ||
1542 | #ifndef FIPS_MODULE | |
1543 | const OSSL_PARAM *pa, *pb; | |
c0f39ded | 1544 | int ok = 0; |
638c3a28 | 1545 | EC_GROUP *named_group = NULL; |
c0f39ded SL |
1546 | BIGNUM *p = NULL, *a = NULL, *b = NULL, *order = NULL, *cofactor = NULL; |
1547 | EC_POINT *point = NULL; | |
1548 | int field_bits = 0; | |
1549 | int is_prime_field = 1; | |
1550 | BN_CTX *bnctx = NULL; | |
1551 | const unsigned char *buf = NULL; | |
1552 | int encoding_flag = -1; | |
638c3a28 | 1553 | #endif |
c0f39ded | 1554 | |
5b5eea4b | 1555 | /* This is the simple named group case */ |
c0f39ded SL |
1556 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_GROUP_NAME); |
1557 | if (ptmp != NULL) { | |
95a6fbdf TM |
1558 | int decoded = 0; |
1559 | ||
1560 | if ((group = group_new_from_name(ptmp, libctx, propq)) == NULL) | |
1561 | return NULL; | |
1562 | if (!ossl_ec_group_set_params(group, params)) { | |
1563 | EC_GROUP_free(group); | |
1564 | return NULL; | |
1565 | } | |
1566 | ||
1567 | ptmp = OSSL_PARAM_locate_const(params, | |
1568 | OSSL_PKEY_PARAM_EC_DECODED_FROM_EXPLICIT_PARAMS); | |
1569 | if (ptmp != NULL && !OSSL_PARAM_get_int(ptmp, &decoded)) { | |
1570 | ERR_raise(ERR_LIB_EC, EC_R_WRONG_CURVE_PARAMETERS); | |
1571 | EC_GROUP_free(group); | |
1572 | return NULL; | |
5b5eea4b | 1573 | } |
95a6fbdf | 1574 | group->decoded_from_explicit_params = decoded > 0; |
c0f39ded SL |
1575 | return group; |
1576 | } | |
638c3a28 | 1577 | #ifdef FIPS_MODULE |
53137462 | 1578 | ERR_raise(ERR_LIB_EC, EC_R_EXPLICIT_PARAMS_NOT_SUPPORTED); |
638c3a28 TM |
1579 | return NULL; |
1580 | #else | |
5b5eea4b | 1581 | /* If it gets here then we are trying explicit parameters */ |
c0f39ded SL |
1582 | bnctx = BN_CTX_new_ex(libctx); |
1583 | if (bnctx == NULL) { | |
e077455e | 1584 | ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB); |
c0f39ded SL |
1585 | return 0; |
1586 | } | |
1587 | BN_CTX_start(bnctx); | |
1588 | ||
1589 | p = BN_CTX_get(bnctx); | |
1590 | a = BN_CTX_get(bnctx); | |
1591 | b = BN_CTX_get(bnctx); | |
1592 | order = BN_CTX_get(bnctx); | |
1593 | if (order == NULL) { | |
e077455e | 1594 | ERR_raise(ERR_LIB_EC, ERR_R_BN_LIB); |
c0f39ded SL |
1595 | goto err; |
1596 | } | |
1597 | ||
1598 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_FIELD_TYPE); | |
1599 | if (ptmp == NULL || ptmp->data_type != OSSL_PARAM_UTF8_STRING) { | |
9311d0c4 | 1600 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_FIELD); |
c0f39ded SL |
1601 | goto err; |
1602 | } | |
fba140c7 | 1603 | if (OPENSSL_strcasecmp(ptmp->data, SN_X9_62_prime_field) == 0) { |
c0f39ded | 1604 | is_prime_field = 1; |
fba140c7 DB |
1605 | } else if (OPENSSL_strcasecmp(ptmp->data, |
1606 | SN_X9_62_characteristic_two_field) == 0) { | |
c0f39ded SL |
1607 | is_prime_field = 0; |
1608 | } else { | |
1609 | /* Invalid field */ | |
9311d0c4 | 1610 | ERR_raise(ERR_LIB_EC, EC_R_UNSUPPORTED_FIELD); |
c0f39ded SL |
1611 | goto err; |
1612 | } | |
1613 | ||
1614 | pa = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_A); | |
1615 | if (!OSSL_PARAM_get_BN(pa, &a)) { | |
9311d0c4 | 1616 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_A); |
c0f39ded SL |
1617 | goto err; |
1618 | } | |
1619 | pb = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_B); | |
1620 | if (!OSSL_PARAM_get_BN(pb, &b)) { | |
9311d0c4 | 1621 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_B); |
c0f39ded SL |
1622 | goto err; |
1623 | } | |
1624 | ||
1625 | /* extract the prime number or irreducible polynomial */ | |
1626 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_P); | |
1627 | if (!OSSL_PARAM_get_BN(ptmp, &p)) { | |
9311d0c4 | 1628 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_P); |
c0f39ded SL |
1629 | goto err; |
1630 | } | |
1631 | ||
1632 | if (is_prime_field) { | |
1633 | if (BN_is_negative(p) || BN_is_zero(p)) { | |
9311d0c4 | 1634 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_P); |
c0f39ded SL |
1635 | goto err; |
1636 | } | |
1637 | field_bits = BN_num_bits(p); | |
1638 | if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { | |
9311d0c4 | 1639 | ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE); |
c0f39ded SL |
1640 | goto err; |
1641 | } | |
1642 | ||
1643 | /* create the EC_GROUP structure */ | |
1644 | group = EC_GROUP_new_curve_GFp(p, a, b, bnctx); | |
1645 | } else { | |
638c3a28 | 1646 | # ifdef OPENSSL_NO_EC2M |
9311d0c4 | 1647 | ERR_raise(ERR_LIB_EC, EC_R_GF2M_NOT_SUPPORTED); |
c0f39ded | 1648 | goto err; |
638c3a28 | 1649 | # else |
c0f39ded SL |
1650 | /* create the EC_GROUP structure */ |
1651 | group = EC_GROUP_new_curve_GF2m(p, a, b, NULL); | |
1652 | if (group != NULL) { | |
1653 | field_bits = EC_GROUP_get_degree(group); | |
1654 | if (field_bits > OPENSSL_ECC_MAX_FIELD_BITS) { | |
9311d0c4 | 1655 | ERR_raise(ERR_LIB_EC, EC_R_FIELD_TOO_LARGE); |
c0f39ded SL |
1656 | goto err; |
1657 | } | |
1658 | } | |
638c3a28 | 1659 | # endif /* OPENSSL_NO_EC2M */ |
c0f39ded SL |
1660 | } |
1661 | ||
1662 | if (group == NULL) { | |
9311d0c4 | 1663 | ERR_raise(ERR_LIB_EC, ERR_R_EC_LIB); |
c0f39ded SL |
1664 | goto err; |
1665 | } | |
1666 | ||
1667 | /* Optional seed */ | |
1668 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_SEED); | |
1669 | if (ptmp != NULL) { | |
1670 | if (ptmp->data_type != OSSL_PARAM_OCTET_STRING) { | |
9311d0c4 | 1671 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_SEED); |
c0f39ded SL |
1672 | goto err; |
1673 | } | |
1674 | if (!EC_GROUP_set_seed(group, ptmp->data, ptmp->data_size)) | |
1675 | goto err; | |
1676 | } | |
1677 | ||
1678 | /* generator base point */ | |
1679 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_GENERATOR); | |
1680 | if (ptmp == NULL | |
1681 | || ptmp->data_type != OSSL_PARAM_OCTET_STRING) { | |
9311d0c4 | 1682 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR); |
c0f39ded SL |
1683 | goto err; |
1684 | } | |
1685 | buf = (const unsigned char *)(ptmp->data); | |
1686 | if ((point = EC_POINT_new(group)) == NULL) | |
1687 | goto err; | |
1688 | EC_GROUP_set_point_conversion_form(group, | |
1689 | (point_conversion_form_t)buf[0] & ~0x01); | |
1690 | if (!EC_POINT_oct2point(group, point, buf, ptmp->data_size, bnctx)) { | |
9311d0c4 | 1691 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR); |
c0f39ded SL |
1692 | goto err; |
1693 | } | |
1694 | ||
1695 | /* order */ | |
1696 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ORDER); | |
1697 | if (!OSSL_PARAM_get_BN(ptmp, &order) | |
1698 | || (BN_is_negative(order) || BN_is_zero(order)) | |
1699 | || (BN_num_bits(order) > (int)field_bits + 1)) { /* Hasse bound */ | |
9311d0c4 | 1700 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_GROUP_ORDER); |
c0f39ded SL |
1701 | goto err; |
1702 | } | |
1703 | ||
1704 | /* Optional cofactor */ | |
1705 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_COFACTOR); | |
1706 | if (ptmp != NULL) { | |
1707 | cofactor = BN_CTX_get(bnctx); | |
1708 | if (cofactor == NULL || !OSSL_PARAM_get_BN(ptmp, &cofactor)) { | |
9311d0c4 | 1709 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_COFACTOR); |
c0f39ded SL |
1710 | goto err; |
1711 | } | |
1712 | } | |
1713 | ||
1714 | /* set the generator, order and cofactor (if present) */ | |
1715 | if (!EC_GROUP_set_generator(group, point, order, cofactor)) { | |
9311d0c4 | 1716 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_GENERATOR); |
c0f39ded SL |
1717 | goto err; |
1718 | } | |
1719 | ||
1720 | named_group = ec_group_explicit_to_named(group, libctx, propq, bnctx); | |
1721 | if (named_group == NULL) { | |
9311d0c4 | 1722 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_NAMED_GROUP_CONVERSION); |
c0f39ded SL |
1723 | goto err; |
1724 | } | |
1725 | if (named_group == group) { | |
1726 | /* | |
1727 | * If we did not find a named group then the encoding should be explicit | |
1728 | * if it was specified | |
1729 | */ | |
5b5eea4b SL |
1730 | ptmp = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_EC_ENCODING); |
1731 | if (ptmp != NULL | |
32ab57cb | 1732 | && !ossl_ec_encoding_param2id(ptmp, &encoding_flag)) { |
10481d33 PH |
1733 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING); |
1734 | goto err; | |
5b5eea4b | 1735 | } |
c0f39ded | 1736 | if (encoding_flag == OPENSSL_EC_NAMED_CURVE) { |
9311d0c4 | 1737 | ERR_raise(ERR_LIB_EC, EC_R_INVALID_ENCODING); |
c0f39ded SL |
1738 | goto err; |
1739 | } | |
1740 | EC_GROUP_set_asn1_flag(group, OPENSSL_EC_EXPLICIT_CURVE); | |
1741 | } else { | |
1742 | EC_GROUP_free(group); | |
1743 | group = named_group; | |
1744 | } | |
95a6fbdf TM |
1745 | /* We've imported the group from explicit parameters, set it so. */ |
1746 | group->decoded_from_explicit_params = 1; | |
c0f39ded SL |
1747 | ok = 1; |
1748 | err: | |
1749 | if (!ok) { | |
1750 | EC_GROUP_free(group); | |
1751 | group = NULL; | |
1752 | } | |
1753 | EC_POINT_free(point); | |
1754 | BN_CTX_end(bnctx); | |
1755 | BN_CTX_free(bnctx); | |
1756 | ||
1757 | return group; | |
638c3a28 | 1758 | #endif /* FIPS_MODULE */ |
c0f39ded | 1759 | } |
a8aad913 OM |
1760 | |
1761 | OSSL_PARAM *EC_GROUP_to_params(const EC_GROUP *group, OSSL_LIB_CTX *libctx, | |
1762 | const char *propq, BN_CTX *bnctx) | |
1763 | { | |
1764 | OSSL_PARAM_BLD *tmpl = NULL; | |
1765 | BN_CTX *new_bnctx = NULL; | |
1766 | unsigned char *gen_buf = NULL; | |
1767 | OSSL_PARAM *params = NULL; | |
1768 | ||
1769 | if (group == NULL) | |
1770 | goto err; | |
1771 | ||
1772 | tmpl = OSSL_PARAM_BLD_new(); | |
1773 | if (tmpl == NULL) | |
1774 | goto err; | |
1775 | ||
1776 | if (bnctx == NULL) | |
1777 | bnctx = new_bnctx = BN_CTX_new_ex(libctx); | |
1778 | if (bnctx == NULL) | |
1779 | goto err; | |
1780 | BN_CTX_start(bnctx); | |
1781 | ||
1782 | if (!ossl_ec_group_todata( | |
1783 | group, tmpl, NULL, libctx, propq, bnctx, &gen_buf)) | |
1784 | goto err; | |
1785 | ||
1786 | params = OSSL_PARAM_BLD_to_param(tmpl); | |
1787 | ||
1788 | err: | |
1789 | OSSL_PARAM_BLD_free(tmpl); | |
1790 | OPENSSL_free(gen_buf); | |
1791 | BN_CTX_end(bnctx); | |
1792 | BN_CTX_free(new_bnctx); | |
1793 | return params; | |
1794 | } |