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14a7cfb3 BM |
1 | /* |
2 | * Written by Nils Larsch for the OpenSSL project. | |
3 | */ | |
4 | /* ==================================================================== | |
9dd84053 | 5 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. |
14a7cfb3 BM |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions | |
9 | * are met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright | |
0f113f3e | 12 | * notice, this list of conditions and the following disclaimer. |
14a7cfb3 BM |
13 | * |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in | |
16 | * the documentation and/or other materials provided with the | |
17 | * distribution. | |
18 | * | |
19 | * 3. All advertising materials mentioning features or use of this | |
20 | * software must display the following acknowledgment: | |
21 | * "This product includes software developed by the OpenSSL Project | |
22 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
23 | * | |
24 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
25 | * endorse or promote products derived from this software without | |
26 | * prior written permission. For written permission, please contact | |
27 | * openssl-core@openssl.org. | |
28 | * | |
29 | * 5. Products derived from this software may not be called "OpenSSL" | |
30 | * nor may "OpenSSL" appear in their names without prior written | |
31 | * permission of the OpenSSL Project. | |
32 | * | |
33 | * 6. Redistributions of any form whatsoever must retain the following | |
34 | * acknowledgment: | |
35 | * "This product includes software developed by the OpenSSL Project | |
36 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
37 | * | |
38 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
39 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
40 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
41 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
42 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
43 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
44 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
45 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
46 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
47 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
48 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
49 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
50 | * ==================================================================== | |
51 | * | |
52 | * This product includes cryptographic software written by Eric Young | |
53 | * (eay@cryptsoft.com). This product includes software written by Tim | |
54 | * Hudson (tjh@cryptsoft.com). | |
55 | * | |
56 | */ | |
e172d60d BM |
57 | /* ==================================================================== |
58 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
0f113f3e | 59 | * Portions originally developed by SUN MICROSYSTEMS, INC., and |
e172d60d BM |
60 | * contributed to the OpenSSL project. |
61 | */ | |
14a7cfb3 | 62 | |
984d6c60 | 63 | #include <internal/cryptlib.h> |
5454829a | 64 | #include <string.h> |
14a7cfb3 BM |
65 | #include "ec_lcl.h" |
66 | #include <openssl/err.h> | |
33bed28b | 67 | #ifndef OPENSSL_NO_ENGINE |
51966416 DSH |
68 | # include <openssl/engine.h> |
69 | #endif | |
14a7cfb3 BM |
70 | |
71 | EC_KEY *EC_KEY_new(void) | |
0f113f3e | 72 | { |
28572b57 | 73 | return EC_KEY_new_method(NULL); |
0f113f3e | 74 | } |
14a7cfb3 | 75 | |
9dd84053 | 76 | EC_KEY *EC_KEY_new_by_curve_name(int nid) |
0f113f3e MC |
77 | { |
78 | EC_KEY *ret = EC_KEY_new(); | |
79 | if (ret == NULL) | |
80 | return NULL; | |
81 | ret->group = EC_GROUP_new_by_curve_name(nid); | |
82 | if (ret->group == NULL) { | |
83 | EC_KEY_free(ret); | |
84 | return NULL; | |
85 | } | |
91e7bcc2 DSH |
86 | if (ret->meth->set_group != NULL |
87 | && ret->meth->set_group(ret, ret->group) == 0) { | |
3475bc96 DSH |
88 | EC_KEY_free(ret); |
89 | return NULL; | |
90 | } | |
0f113f3e MC |
91 | return ret; |
92 | } | |
14a7cfb3 BM |
93 | |
94 | void EC_KEY_free(EC_KEY *r) | |
0f113f3e MC |
95 | { |
96 | int i; | |
14a7cfb3 | 97 | |
0f113f3e MC |
98 | if (r == NULL) |
99 | return; | |
14a7cfb3 | 100 | |
0f113f3e | 101 | i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC); |
f3f1cf84 | 102 | REF_PRINT_COUNT("EC_KEY", r); |
0f113f3e MC |
103 | if (i > 0) |
104 | return; | |
f3f1cf84 | 105 | REF_ASSERT_ISNT(i < 0); |
14a7cfb3 | 106 | |
91e7bcc2 | 107 | if (r->meth->finish != NULL) |
0d6ff6d3 DSH |
108 | r->meth->finish(r); |
109 | ||
51966416 | 110 | #ifndef OPENSSL_NO_ENGINE |
7c96dbcd | 111 | ENGINE_finish(r->engine); |
51966416 DSH |
112 | #endif |
113 | ||
3aef36ff | 114 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data); |
8fdc3734 RS |
115 | EC_GROUP_free(r->group); |
116 | EC_POINT_free(r->pub_key); | |
23a1d5e9 | 117 | BN_clear_free(r->priv_key); |
14a7cfb3 | 118 | |
4b45c6e5 | 119 | OPENSSL_clear_free((void *)r, sizeof(EC_KEY)); |
0f113f3e | 120 | } |
14a7cfb3 | 121 | |
3aef36ff | 122 | EC_KEY *EC_KEY_copy(EC_KEY *dest, EC_KEY *src) |
0f113f3e | 123 | { |
0f113f3e MC |
124 | if (dest == NULL || src == NULL) { |
125 | ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER); | |
126 | return NULL; | |
127 | } | |
ea0392b9 | 128 | if (src->meth != dest->meth) { |
91e7bcc2 | 129 | if (dest->meth->finish != NULL) |
ea0392b9 DSH |
130 | dest->meth->finish(dest); |
131 | #ifndef OPENSSL_NO_ENGINE | |
7c96dbcd | 132 | if (ENGINE_finish(dest->engine) == 0) |
ea0392b9 DSH |
133 | return 0; |
134 | dest->engine = NULL; | |
135 | #endif | |
136 | } | |
0f113f3e | 137 | /* copy the parameters */ |
91e7bcc2 | 138 | if (src->group != NULL) { |
0f113f3e MC |
139 | const EC_METHOD *meth = EC_GROUP_method_of(src->group); |
140 | /* clear the old group */ | |
8fdc3734 | 141 | EC_GROUP_free(dest->group); |
0f113f3e MC |
142 | dest->group = EC_GROUP_new(meth); |
143 | if (dest->group == NULL) | |
144 | return NULL; | |
145 | if (!EC_GROUP_copy(dest->group, src->group)) | |
146 | return NULL; | |
147 | } | |
148 | /* copy the public key */ | |
91e7bcc2 | 149 | if (src->pub_key != NULL && src->group != NULL) { |
8fdc3734 | 150 | EC_POINT_free(dest->pub_key); |
0f113f3e MC |
151 | dest->pub_key = EC_POINT_new(src->group); |
152 | if (dest->pub_key == NULL) | |
153 | return NULL; | |
154 | if (!EC_POINT_copy(dest->pub_key, src->pub_key)) | |
155 | return NULL; | |
156 | } | |
157 | /* copy the private key */ | |
91e7bcc2 | 158 | if (src->priv_key != NULL) { |
0f113f3e MC |
159 | if (dest->priv_key == NULL) { |
160 | dest->priv_key = BN_new(); | |
161 | if (dest->priv_key == NULL) | |
162 | return NULL; | |
163 | } | |
164 | if (!BN_copy(dest->priv_key, src->priv_key)) | |
165 | return NULL; | |
166 | } | |
0f113f3e MC |
167 | |
168 | /* copy the rest */ | |
169 | dest->enc_flag = src->enc_flag; | |
170 | dest->conv_form = src->conv_form; | |
171 | dest->version = src->version; | |
172 | dest->flags = src->flags; | |
3aef36ff RS |
173 | if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY, |
174 | &dest->ex_data, &src->ex_data)) | |
175 | return NULL; | |
0f113f3e | 176 | |
ea0392b9 DSH |
177 | if (src->meth != dest->meth) { |
178 | #ifndef OPENSSL_NO_ENGINE | |
91e7bcc2 DSH |
179 | if (src->engine != NULL && ENGINE_init(src->engine) == 0) |
180 | return NULL; | |
ea0392b9 DSH |
181 | dest->engine = src->engine; |
182 | #endif | |
183 | dest->meth = src->meth; | |
184 | } | |
185 | ||
91e7bcc2 DSH |
186 | if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0) |
187 | return NULL; | |
ea0392b9 | 188 | |
0f113f3e MC |
189 | return dest; |
190 | } | |
14a7cfb3 | 191 | |
3aef36ff | 192 | EC_KEY *EC_KEY_dup(EC_KEY *ec_key) |
0f113f3e | 193 | { |
ea0392b9 | 194 | EC_KEY *ret = EC_KEY_new_method(ec_key->engine); |
3aef36ff | 195 | |
0f113f3e MC |
196 | if (ret == NULL) |
197 | return NULL; | |
198 | if (EC_KEY_copy(ret, ec_key) == NULL) { | |
199 | EC_KEY_free(ret); | |
200 | return NULL; | |
201 | } | |
202 | return ret; | |
203 | } | |
14a7cfb3 | 204 | |
e172d60d | 205 | int EC_KEY_up_ref(EC_KEY *r) |
0f113f3e MC |
206 | { |
207 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC); | |
f3f1cf84 RS |
208 | |
209 | REF_PRINT_COUNT("EC_KEY", r); | |
210 | REF_ASSERT_ISNT(i < 2); | |
0f113f3e MC |
211 | return ((i > 1) ? 1 : 0); |
212 | } | |
e172d60d | 213 | |
14a7cfb3 | 214 | int EC_KEY_generate_key(EC_KEY *eckey) |
0f113f3e | 215 | { |
91e7bcc2 | 216 | if (eckey == NULL || eckey->group == NULL) { |
0f113f3e MC |
217 | ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER); |
218 | return 0; | |
219 | } | |
91e7bcc2 | 220 | if (eckey->meth->keygen != NULL) |
5a6a1029 DSH |
221 | return eckey->meth->keygen(eckey); |
222 | ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED); | |
223 | return 0; | |
224 | } | |
225 | ||
226 | int ossl_ec_key_gen(EC_KEY *eckey) | |
227 | { | |
228 | int ok = 0; | |
229 | BN_CTX *ctx = NULL; | |
be2e334f DSH |
230 | BIGNUM *priv_key = NULL; |
231 | const BIGNUM *order = NULL; | |
5a6a1029 | 232 | EC_POINT *pub_key = NULL; |
0f113f3e | 233 | |
0f113f3e MC |
234 | if ((ctx = BN_CTX_new()) == NULL) |
235 | goto err; | |
236 | ||
237 | if (eckey->priv_key == NULL) { | |
238 | priv_key = BN_new(); | |
239 | if (priv_key == NULL) | |
240 | goto err; | |
241 | } else | |
242 | priv_key = eckey->priv_key; | |
243 | ||
be2e334f DSH |
244 | order = EC_GROUP_get0_order(eckey->group); |
245 | if (order == NULL) | |
0f113f3e MC |
246 | goto err; |
247 | ||
248 | do | |
249 | if (!BN_rand_range(priv_key, order)) | |
250 | goto err; | |
251 | while (BN_is_zero(priv_key)) ; | |
252 | ||
253 | if (eckey->pub_key == NULL) { | |
254 | pub_key = EC_POINT_new(eckey->group); | |
255 | if (pub_key == NULL) | |
256 | goto err; | |
257 | } else | |
258 | pub_key = eckey->pub_key; | |
259 | ||
260 | if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) | |
261 | goto err; | |
262 | ||
263 | eckey->priv_key = priv_key; | |
264 | eckey->pub_key = pub_key; | |
265 | ||
266 | ok = 1; | |
267 | ||
268 | err: | |
8fdc3734 | 269 | if (eckey->pub_key == NULL) |
0f113f3e | 270 | EC_POINT_free(pub_key); |
23a1d5e9 | 271 | if (eckey->priv_key != priv_key) |
0f113f3e | 272 | BN_free(priv_key); |
23a1d5e9 | 273 | BN_CTX_free(ctx); |
0f113f3e MC |
274 | return (ok); |
275 | } | |
14a7cfb3 BM |
276 | |
277 | int EC_KEY_check_key(const EC_KEY *eckey) | |
0f113f3e MC |
278 | { |
279 | int ok = 0; | |
280 | BN_CTX *ctx = NULL; | |
281 | const BIGNUM *order = NULL; | |
282 | EC_POINT *point = NULL; | |
283 | ||
91e7bcc2 | 284 | if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) { |
0f113f3e MC |
285 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); |
286 | return 0; | |
287 | } | |
288 | ||
289 | if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) { | |
290 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY); | |
291 | goto err; | |
292 | } | |
293 | ||
294 | if ((ctx = BN_CTX_new()) == NULL) | |
295 | goto err; | |
296 | if ((point = EC_POINT_new(eckey->group)) == NULL) | |
297 | goto err; | |
298 | ||
299 | /* testing whether the pub_key is on the elliptic curve */ | |
68886be7 | 300 | if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) { |
0f113f3e MC |
301 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE); |
302 | goto err; | |
303 | } | |
304 | /* testing whether pub_key * order is the point at infinity */ | |
305 | order = eckey->group->order; | |
306 | if (BN_is_zero(order)) { | |
307 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER); | |
308 | goto err; | |
309 | } | |
310 | if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) { | |
311 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); | |
312 | goto err; | |
313 | } | |
314 | if (!EC_POINT_is_at_infinity(eckey->group, point)) { | |
315 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER); | |
316 | goto err; | |
317 | } | |
318 | /* | |
319 | * in case the priv_key is present : check if generator * priv_key == | |
320 | * pub_key | |
321 | */ | |
91e7bcc2 | 322 | if (eckey->priv_key != NULL) { |
0f113f3e MC |
323 | if (BN_cmp(eckey->priv_key, order) >= 0) { |
324 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER); | |
325 | goto err; | |
326 | } | |
327 | if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, | |
328 | NULL, NULL, ctx)) { | |
329 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); | |
330 | goto err; | |
331 | } | |
332 | if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) { | |
333 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY); | |
334 | goto err; | |
335 | } | |
336 | } | |
337 | ok = 1; | |
338 | err: | |
23a1d5e9 | 339 | BN_CTX_free(ctx); |
8fdc3734 | 340 | EC_POINT_free(point); |
0f113f3e MC |
341 | return (ok); |
342 | } | |
343 | ||
344 | int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x, | |
345 | BIGNUM *y) | |
346 | { | |
347 | BN_CTX *ctx = NULL; | |
348 | BIGNUM *tx, *ty; | |
349 | EC_POINT *point = NULL; | |
8d11b7c7 MC |
350 | int ok = 0; |
351 | #ifndef OPENSSL_NO_EC2M | |
352 | int tmp_nid, is_char_two = 0; | |
353 | #endif | |
0f113f3e | 354 | |
91e7bcc2 | 355 | if (key == NULL || key->group == NULL || x == NULL || y == NULL) { |
0f113f3e MC |
356 | ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, |
357 | ERR_R_PASSED_NULL_PARAMETER); | |
358 | return 0; | |
359 | } | |
360 | ctx = BN_CTX_new(); | |
90945fa3 | 361 | if (ctx == NULL) |
0f113f3e MC |
362 | goto err; |
363 | ||
364 | point = EC_POINT_new(key->group); | |
365 | ||
90945fa3 | 366 | if (point == NULL) |
0f113f3e MC |
367 | goto err; |
368 | ||
8d11b7c7 MC |
369 | tx = BN_CTX_get(ctx); |
370 | ty = BN_CTX_get(ctx); | |
dd67493c BB |
371 | if (ty == NULL) |
372 | goto err; | |
8d11b7c7 MC |
373 | |
374 | #ifndef OPENSSL_NO_EC2M | |
0f113f3e MC |
375 | tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group)); |
376 | ||
377 | if (tmp_nid == NID_X9_62_characteristic_two_field) | |
378 | is_char_two = 1; | |
379 | ||
0f113f3e MC |
380 | if (is_char_two) { |
381 | if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point, | |
382 | x, y, ctx)) | |
383 | goto err; | |
384 | if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point, | |
385 | tx, ty, ctx)) | |
386 | goto err; | |
387 | } else | |
b3310161 | 388 | #endif |
0f113f3e MC |
389 | { |
390 | if (!EC_POINT_set_affine_coordinates_GFp(key->group, point, | |
391 | x, y, ctx)) | |
392 | goto err; | |
393 | if (!EC_POINT_get_affine_coordinates_GFp(key->group, point, | |
394 | tx, ty, ctx)) | |
395 | goto err; | |
396 | } | |
397 | /* | |
398 | * Check if retrieved coordinates match originals and are less than field | |
399 | * order: if not values are out of range. | |
400 | */ | |
401 | if (BN_cmp(x, tx) || BN_cmp(y, ty) | |
402 | || (BN_cmp(x, key->group->field) >= 0) | |
403 | || (BN_cmp(y, key->group->field) >= 0)) { | |
404 | ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES, | |
405 | EC_R_COORDINATES_OUT_OF_RANGE); | |
406 | goto err; | |
407 | } | |
408 | ||
409 | if (!EC_KEY_set_public_key(key, point)) | |
410 | goto err; | |
411 | ||
412 | if (EC_KEY_check_key(key) == 0) | |
413 | goto err; | |
414 | ||
415 | ok = 1; | |
416 | ||
417 | err: | |
23a1d5e9 | 418 | BN_CTX_free(ctx); |
8fdc3734 | 419 | EC_POINT_free(point); |
0f113f3e MC |
420 | return ok; |
421 | ||
422 | } | |
fef1c40b | 423 | |
9dd84053 | 424 | const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key) |
0f113f3e MC |
425 | { |
426 | return key->group; | |
427 | } | |
9dd84053 NL |
428 | |
429 | int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group) | |
0f113f3e | 430 | { |
91e7bcc2 | 431 | if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0) |
3475bc96 | 432 | return 0; |
8fdc3734 | 433 | EC_GROUP_free(key->group); |
0f113f3e MC |
434 | key->group = EC_GROUP_dup(group); |
435 | return (key->group == NULL) ? 0 : 1; | |
436 | } | |
9dd84053 NL |
437 | |
438 | const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key) | |
0f113f3e MC |
439 | { |
440 | return key->priv_key; | |
441 | } | |
9dd84053 NL |
442 | |
443 | int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key) | |
0f113f3e | 444 | { |
91e7bcc2 DSH |
445 | if (key->meth->set_private != NULL |
446 | && key->meth->set_private(key, priv_key) == 0) | |
3475bc96 | 447 | return 0; |
23a1d5e9 | 448 | BN_clear_free(key->priv_key); |
0f113f3e MC |
449 | key->priv_key = BN_dup(priv_key); |
450 | return (key->priv_key == NULL) ? 0 : 1; | |
451 | } | |
9dd84053 NL |
452 | |
453 | const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key) | |
0f113f3e MC |
454 | { |
455 | return key->pub_key; | |
456 | } | |
9dd84053 NL |
457 | |
458 | int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key) | |
0f113f3e | 459 | { |
91e7bcc2 DSH |
460 | if (key->meth->set_public != NULL |
461 | && key->meth->set_public(key, pub_key) == 0) | |
3475bc96 | 462 | return 0; |
8fdc3734 | 463 | EC_POINT_free(key->pub_key); |
0f113f3e MC |
464 | key->pub_key = EC_POINT_dup(pub_key, key->group); |
465 | return (key->pub_key == NULL) ? 0 : 1; | |
466 | } | |
9dd84053 NL |
467 | |
468 | unsigned int EC_KEY_get_enc_flags(const EC_KEY *key) | |
0f113f3e MC |
469 | { |
470 | return key->enc_flag; | |
471 | } | |
9dd84053 NL |
472 | |
473 | void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags) | |
0f113f3e MC |
474 | { |
475 | key->enc_flag = flags; | |
476 | } | |
9dd84053 NL |
477 | |
478 | point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key) | |
0f113f3e MC |
479 | { |
480 | return key->conv_form; | |
481 | } | |
9dd84053 NL |
482 | |
483 | void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform) | |
0f113f3e MC |
484 | { |
485 | key->conv_form = cform; | |
486 | if (key->group != NULL) | |
487 | EC_GROUP_set_point_conversion_form(key->group, cform); | |
488 | } | |
9dd84053 | 489 | |
9dd84053 | 490 | void EC_KEY_set_asn1_flag(EC_KEY *key, int flag) |
0f113f3e MC |
491 | { |
492 | if (key->group != NULL) | |
493 | EC_GROUP_set_asn1_flag(key->group, flag); | |
494 | } | |
9dd84053 NL |
495 | |
496 | int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx) | |
0f113f3e MC |
497 | { |
498 | if (key->group == NULL) | |
499 | return 0; | |
500 | return EC_GROUP_precompute_mult(key->group, ctx); | |
501 | } | |
cac4fb58 DSH |
502 | |
503 | int EC_KEY_get_flags(const EC_KEY *key) | |
0f113f3e MC |
504 | { |
505 | return key->flags; | |
506 | } | |
cac4fb58 DSH |
507 | |
508 | void EC_KEY_set_flags(EC_KEY *key, int flags) | |
0f113f3e MC |
509 | { |
510 | key->flags |= flags; | |
511 | } | |
cac4fb58 DSH |
512 | |
513 | void EC_KEY_clear_flags(EC_KEY *key, int flags) | |
0f113f3e MC |
514 | { |
515 | key->flags &= ~flags; | |
516 | } | |
981bd8a2 DSH |
517 | |
518 | size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form, | |
519 | unsigned char **pbuf, BN_CTX *ctx) | |
520 | { | |
521 | if (key == NULL || key->pub_key == NULL || key->group == NULL) | |
522 | return 0; | |
523 | return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx); | |
524 | } | |
525 | ||
526 | int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len, | |
527 | BN_CTX *ctx) | |
528 | { | |
529 | if (key == NULL || key->group == NULL) | |
530 | return 0; | |
531 | if (key->pub_key == NULL) | |
532 | key->pub_key = EC_POINT_new(key->group); | |
533 | if (key->pub_key == NULL) | |
534 | return 0; | |
535 | return EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx); | |
536 | } | |
cf241395 DSH |
537 | |
538 | size_t EC_KEY_priv2oct(const EC_KEY *eckey, unsigned char *buf, size_t len) | |
539 | { | |
907e9500 | 540 | size_t buf_len; |
cf241395 DSH |
541 | if (eckey->group == NULL || eckey->group->meth == NULL) |
542 | return 0; | |
543 | ||
544 | buf_len = (EC_GROUP_get_degree(eckey->group) + 7) / 8; | |
545 | if (eckey->priv_key == NULL) | |
546 | return 0; | |
547 | if (buf == NULL) | |
548 | return buf_len; | |
549 | else if (len < buf_len) | |
550 | return 0; | |
551 | ||
cf241395 DSH |
552 | /* Octetstring may need leading zeros if BN is to short */ |
553 | ||
907e9500 | 554 | if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) { |
d810700b | 555 | ECerr(EC_F_EC_KEY_PRIV2OCT, EC_R_BUFFER_TOO_SMALL); |
cf241395 DSH |
556 | return 0; |
557 | } | |
558 | ||
cf241395 DSH |
559 | return buf_len; |
560 | } | |
561 | ||
562 | int EC_KEY_oct2priv(EC_KEY *eckey, unsigned char *buf, size_t len) | |
563 | { | |
564 | if (eckey->group == NULL || eckey->group->meth == NULL) | |
565 | return 0; | |
566 | ||
567 | if (eckey->priv_key == NULL) | |
568 | eckey->priv_key = BN_secure_new(); | |
569 | if (eckey->priv_key == NULL) { | |
d810700b | 570 | ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_MALLOC_FAILURE); |
cf241395 DSH |
571 | return 0; |
572 | } | |
573 | eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key); | |
574 | if (eckey->priv_key == NULL) { | |
d810700b | 575 | ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_BN_LIB); |
cf241395 DSH |
576 | return 0; |
577 | } | |
578 | return 1; | |
579 | } | |
7fc7d1a7 DSH |
580 | |
581 | size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf) | |
582 | { | |
583 | size_t len; | |
584 | unsigned char *buf; | |
585 | len = EC_KEY_priv2oct(eckey, NULL, 0); | |
afcee950 RS |
586 | if (len == 0) |
587 | return 0; | |
7fc7d1a7 DSH |
588 | buf = OPENSSL_malloc(len); |
589 | if (buf == NULL) | |
590 | return 0; | |
591 | len = EC_KEY_priv2oct(eckey, buf, len); | |
592 | if (len == 0) { | |
593 | OPENSSL_free(buf); | |
594 | return 0; | |
595 | } | |
596 | *pbuf = buf; | |
597 | return len; | |
598 | } |