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14a7cfb3 BM |
1 | /* crypto/ec/ec_key.c */ |
2 | /* | |
3 | * Written by Nils Larsch for the OpenSSL project. | |
4 | */ | |
5 | /* ==================================================================== | |
9dd84053 | 6 | * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. |
14a7cfb3 BM |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * | |
15 | * 2. Redistributions in binary form must reproduce the above copyright | |
16 | * notice, this list of conditions and the following disclaimer in | |
17 | * the documentation and/or other materials provided with the | |
18 | * distribution. | |
19 | * | |
20 | * 3. All advertising materials mentioning features or use of this | |
21 | * software must display the following acknowledgment: | |
22 | * "This product includes software developed by the OpenSSL Project | |
23 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | |
24 | * | |
25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | |
26 | * endorse or promote products derived from this software without | |
27 | * prior written permission. For written permission, please contact | |
28 | * openssl-core@openssl.org. | |
29 | * | |
30 | * 5. Products derived from this software may not be called "OpenSSL" | |
31 | * nor may "OpenSSL" appear in their names without prior written | |
32 | * permission of the OpenSSL Project. | |
33 | * | |
34 | * 6. Redistributions of any form whatsoever must retain the following | |
35 | * acknowledgment: | |
36 | * "This product includes software developed by the OpenSSL Project | |
37 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | |
38 | * | |
39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | |
40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | |
43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | |
50 | * OF THE POSSIBILITY OF SUCH DAMAGE. | |
51 | * ==================================================================== | |
52 | * | |
53 | * This product includes cryptographic software written by Eric Young | |
54 | * (eay@cryptsoft.com). This product includes software written by Tim | |
55 | * Hudson (tjh@cryptsoft.com). | |
56 | * | |
57 | */ | |
e172d60d BM |
58 | /* ==================================================================== |
59 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED. | |
60 | * Portions originally developed by SUN MICROSYSTEMS, INC., and | |
61 | * contributed to the OpenSSL project. | |
62 | */ | |
14a7cfb3 | 63 | |
5454829a | 64 | #include <string.h> |
14a7cfb3 BM |
65 | #include "ec_lcl.h" |
66 | #include <openssl/err.h> | |
e172d60d | 67 | #include <string.h> |
14a7cfb3 BM |
68 | |
69 | EC_KEY *EC_KEY_new(void) | |
70 | { | |
71 | EC_KEY *ret; | |
72 | ||
73 | ret=(EC_KEY *)OPENSSL_malloc(sizeof(EC_KEY)); | |
74 | if (ret == NULL) | |
75 | { | |
aa4ce731 | 76 | ECerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE); |
14a7cfb3 BM |
77 | return(NULL); |
78 | } | |
79 | ||
80 | ret->version = 1; | |
81 | ret->group = NULL; | |
82 | ret->pub_key = NULL; | |
83 | ret->priv_key= NULL; | |
84 | ret->enc_flag= 0; | |
85 | ret->conv_form = POINT_CONVERSION_UNCOMPRESSED; | |
86 | ret->references= 1; | |
9dd84053 | 87 | ret->method_data = NULL; |
14a7cfb3 BM |
88 | return(ret); |
89 | } | |
90 | ||
9dd84053 NL |
91 | EC_KEY *EC_KEY_new_by_curve_name(int nid) |
92 | { | |
93 | EC_KEY *ret = EC_KEY_new(); | |
94 | if (ret == NULL) | |
95 | return NULL; | |
96 | ret->group = EC_GROUP_new_by_curve_name(nid); | |
97 | if (ret->group == NULL) | |
98 | { | |
99 | EC_KEY_free(ret); | |
100 | return NULL; | |
101 | } | |
102 | return ret; | |
103 | } | |
14a7cfb3 BM |
104 | |
105 | void EC_KEY_free(EC_KEY *r) | |
106 | { | |
107 | int i; | |
108 | ||
109 | if (r == NULL) return; | |
110 | ||
111 | i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_EC); | |
112 | #ifdef REF_PRINT | |
113 | REF_PRINT("EC_KEY",r); | |
114 | #endif | |
115 | if (i > 0) return; | |
116 | #ifdef REF_CHECK | |
117 | if (i < 0) | |
118 | { | |
119 | fprintf(stderr,"EC_KEY_free, bad reference count\n"); | |
120 | abort(); | |
121 | } | |
122 | #endif | |
123 | ||
124 | if (r->group != NULL) | |
125 | EC_GROUP_free(r->group); | |
126 | if (r->pub_key != NULL) | |
127 | EC_POINT_free(r->pub_key); | |
128 | if (r->priv_key != NULL) | |
129 | BN_clear_free(r->priv_key); | |
130 | ||
9dd84053 | 131 | EC_EX_DATA_free_all_data(&r->method_data); |
14a7cfb3 | 132 | |
4579924b | 133 | OPENSSL_cleanse((void *)r, sizeof(EC_KEY)); |
14a7cfb3 BM |
134 | |
135 | OPENSSL_free(r); | |
136 | } | |
137 | ||
138 | EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src) | |
139 | { | |
9dd84053 NL |
140 | EC_EXTRA_DATA *d; |
141 | ||
14a7cfb3 BM |
142 | if (dest == NULL || src == NULL) |
143 | { | |
144 | ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER); | |
145 | return NULL; | |
146 | } | |
147 | /* copy the parameters */ | |
148 | if (src->group) | |
149 | { | |
150 | const EC_METHOD *meth = EC_GROUP_method_of(src->group); | |
151 | /* clear the old group */ | |
152 | if (dest->group) | |
153 | EC_GROUP_free(dest->group); | |
154 | dest->group = EC_GROUP_new(meth); | |
155 | if (dest->group == NULL) | |
156 | return NULL; | |
157 | if (!EC_GROUP_copy(dest->group, src->group)) | |
158 | return NULL; | |
159 | } | |
160 | /* copy the public key */ | |
161 | if (src->pub_key && src->group) | |
162 | { | |
163 | if (dest->pub_key) | |
164 | EC_POINT_free(dest->pub_key); | |
165 | dest->pub_key = EC_POINT_new(src->group); | |
166 | if (dest->pub_key == NULL) | |
167 | return NULL; | |
168 | if (!EC_POINT_copy(dest->pub_key, src->pub_key)) | |
169 | return NULL; | |
170 | } | |
171 | /* copy the private key */ | |
172 | if (src->priv_key) | |
173 | { | |
174 | if (dest->priv_key == NULL) | |
175 | { | |
176 | dest->priv_key = BN_new(); | |
177 | if (dest->priv_key == NULL) | |
178 | return NULL; | |
179 | } | |
180 | if (!BN_copy(dest->priv_key, src->priv_key)) | |
181 | return NULL; | |
182 | } | |
9dd84053 NL |
183 | /* copy method/extra data */ |
184 | EC_EX_DATA_free_all_data(&dest->method_data); | |
185 | ||
186 | for (d = src->method_data; d != NULL; d = d->next) | |
187 | { | |
188 | void *t = d->dup_func(d->data); | |
189 | ||
190 | if (t == NULL) | |
191 | return 0; | |
192 | if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func, d->free_func, d->clear_free_func)) | |
193 | return 0; | |
194 | } | |
195 | ||
14a7cfb3 BM |
196 | /* copy the rest */ |
197 | dest->enc_flag = src->enc_flag; | |
198 | dest->conv_form = src->conv_form; | |
199 | dest->version = src->version; | |
200 | ||
201 | return dest; | |
202 | } | |
203 | ||
204 | EC_KEY *EC_KEY_dup(const EC_KEY *eckey) | |
205 | { | |
206 | EC_KEY *ret = NULL; | |
207 | int ok = 1; | |
208 | ||
209 | ret = EC_KEY_new(); | |
210 | if (ret == NULL) | |
211 | return NULL; | |
212 | /* copy the parameters */ | |
213 | if (eckey->group) | |
214 | { | |
215 | ret->group = EC_GROUP_dup(eckey->group); | |
216 | if (ret->group == NULL) | |
217 | ok = 0; | |
218 | } | |
219 | /* copy the public key */ | |
220 | if (eckey->pub_key && eckey->group) | |
221 | { | |
222 | ret->pub_key = EC_POINT_dup(eckey->pub_key, eckey->group); | |
223 | if (ret->pub_key == NULL) | |
224 | ok = 0; | |
225 | } | |
226 | /* copy the private key */ | |
227 | if (eckey->priv_key) | |
228 | { | |
fbbfd86b | 229 | ret->priv_key = BN_dup(eckey->priv_key); |
14a7cfb3 BM |
230 | if (ret->priv_key == NULL) |
231 | ok = 0; | |
232 | } | |
233 | /* copy the rest */ | |
234 | ret->enc_flag = eckey->enc_flag; | |
235 | ret->conv_form = eckey->conv_form; | |
236 | ret->version = eckey->version; | |
237 | ||
238 | if (!ok) | |
239 | { | |
240 | EC_KEY_free(ret); | |
241 | ret = NULL; | |
242 | } | |
243 | ||
244 | return ret; | |
245 | } | |
246 | ||
e172d60d BM |
247 | int EC_KEY_up_ref(EC_KEY *r) |
248 | { | |
249 | int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC); | |
250 | #ifdef REF_PRINT | |
251 | REF_PRINT("EC_KEY",r); | |
252 | #endif | |
253 | #ifdef REF_CHECK | |
254 | if (i < 2) | |
255 | { | |
256 | fprintf(stderr, "EC_KEY_up, bad reference count\n"); | |
257 | abort(); | |
258 | } | |
259 | #endif | |
260 | return ((i > 1) ? 1 : 0); | |
261 | } | |
262 | ||
14a7cfb3 BM |
263 | int EC_KEY_generate_key(EC_KEY *eckey) |
264 | { | |
265 | int ok = 0; | |
266 | BN_CTX *ctx = NULL; | |
267 | BIGNUM *priv_key = NULL, *order = NULL; | |
268 | EC_POINT *pub_key = NULL; | |
269 | ||
270 | if (!eckey || !eckey->group) | |
271 | { | |
272 | ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | if ((order = BN_new()) == NULL) goto err; | |
277 | if ((ctx = BN_CTX_new()) == NULL) goto err; | |
278 | ||
279 | if (eckey->priv_key == NULL) | |
280 | { | |
281 | priv_key = BN_new(); | |
282 | if (priv_key == NULL) | |
283 | goto err; | |
284 | } | |
285 | else | |
286 | priv_key = eckey->priv_key; | |
287 | ||
288 | if (!EC_GROUP_get_order(eckey->group, order, ctx)) | |
289 | goto err; | |
290 | ||
291 | do | |
292 | if (!BN_rand_range(priv_key, order)) | |
293 | goto err; | |
294 | while (BN_is_zero(priv_key)); | |
295 | ||
296 | if (eckey->pub_key == NULL) | |
297 | { | |
298 | pub_key = EC_POINT_new(eckey->group); | |
299 | if (pub_key == NULL) | |
300 | goto err; | |
301 | } | |
302 | else | |
303 | pub_key = eckey->pub_key; | |
304 | ||
305 | if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx)) | |
306 | goto err; | |
307 | ||
308 | eckey->priv_key = priv_key; | |
309 | eckey->pub_key = pub_key; | |
310 | ||
311 | ok=1; | |
312 | ||
313 | err: | |
314 | if (order) | |
315 | BN_free(order); | |
316 | if (pub_key != NULL && eckey->pub_key == NULL) | |
317 | EC_POINT_free(pub_key); | |
318 | if (priv_key != NULL && eckey->priv_key == NULL) | |
319 | BN_free(priv_key); | |
320 | if (ctx != NULL) | |
321 | BN_CTX_free(ctx); | |
322 | return(ok); | |
323 | } | |
324 | ||
325 | int EC_KEY_check_key(const EC_KEY *eckey) | |
326 | { | |
327 | int ok = 0; | |
328 | BN_CTX *ctx = NULL; | |
329 | BIGNUM *order = NULL; | |
330 | EC_POINT *point = NULL; | |
331 | ||
332 | if (!eckey || !eckey->group || !eckey->pub_key) | |
333 | { | |
334 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER); | |
335 | return 0; | |
336 | } | |
337 | ||
338 | if ((ctx = BN_CTX_new()) == NULL) | |
339 | goto err; | |
340 | if ((order = BN_new()) == NULL) | |
341 | goto err; | |
342 | if ((point = EC_POINT_new(eckey->group)) == NULL) | |
343 | goto err; | |
344 | ||
345 | /* testing whether the pub_key is on the elliptic curve */ | |
346 | if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx)) | |
347 | { | |
348 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE); | |
349 | goto err; | |
350 | } | |
351 | /* testing whether pub_key * order is the point at infinity */ | |
352 | if (!EC_GROUP_get_order(eckey->group, order, ctx)) | |
353 | { | |
354 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER); | |
355 | goto err; | |
356 | } | |
357 | if (!EC_POINT_copy(point, eckey->pub_key)) | |
358 | { | |
359 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); | |
360 | goto err; | |
361 | } | |
362 | if (!EC_POINT_mul(eckey->group, point, order, NULL, NULL, ctx)) | |
363 | { | |
364 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); | |
365 | goto err; | |
366 | } | |
367 | if (!EC_POINT_is_at_infinity(eckey->group, point)) | |
368 | { | |
369 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER); | |
370 | goto err; | |
371 | } | |
372 | /* in case the priv_key is present : | |
373 | * check if generator * priv_key == pub_key | |
374 | */ | |
375 | if (eckey->priv_key) | |
376 | { | |
377 | if (BN_cmp(eckey->priv_key, order) >= 0) | |
378 | { | |
379 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER); | |
380 | goto err; | |
381 | } | |
382 | if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, | |
383 | NULL, NULL, ctx)) | |
384 | { | |
385 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB); | |
386 | goto err; | |
387 | } | |
388 | if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, | |
389 | ctx) != 0) | |
390 | { | |
391 | ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY); | |
392 | goto err; | |
393 | } | |
394 | } | |
395 | ok = 1; | |
396 | err: | |
397 | if (ctx != NULL) | |
398 | BN_CTX_free(ctx); | |
399 | if (order != NULL) | |
400 | BN_free(order); | |
401 | if (point != NULL) | |
402 | EC_POINT_free(point); | |
403 | return(ok); | |
404 | } | |
9dd84053 NL |
405 | |
406 | const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key) | |
407 | { | |
408 | return key->group; | |
409 | } | |
410 | ||
411 | int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group) | |
412 | { | |
413 | if (key->group != NULL) | |
414 | EC_GROUP_free(key->group); | |
415 | key->group = EC_GROUP_dup(group); | |
416 | return (key->group == NULL) ? 0 : 1; | |
417 | } | |
418 | ||
419 | const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key) | |
420 | { | |
421 | return key->priv_key; | |
422 | } | |
423 | ||
424 | int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key) | |
425 | { | |
426 | if (key->priv_key) | |
427 | BN_clear_free(key->priv_key); | |
428 | key->priv_key = BN_dup(priv_key); | |
429 | return (key->priv_key == NULL) ? 0 : 1; | |
430 | } | |
431 | ||
432 | const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key) | |
433 | { | |
434 | return key->pub_key; | |
435 | } | |
436 | ||
437 | int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key) | |
438 | { | |
439 | if (key->pub_key != NULL) | |
440 | EC_POINT_free(key->pub_key); | |
441 | key->pub_key = EC_POINT_dup(pub_key, key->group); | |
442 | return (key->pub_key == NULL) ? 0 : 1; | |
443 | } | |
444 | ||
445 | unsigned int EC_KEY_get_enc_flags(const EC_KEY *key) | |
446 | { | |
447 | return key->enc_flag; | |
448 | } | |
449 | ||
450 | void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags) | |
451 | { | |
452 | key->enc_flag = flags; | |
453 | } | |
454 | ||
455 | point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key) | |
456 | { | |
457 | return key->conv_form; | |
458 | } | |
459 | ||
460 | void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform) | |
461 | { | |
462 | key->conv_form = cform; | |
463 | if (key->group != NULL) | |
464 | EC_GROUP_set_point_conversion_form(key->group, cform); | |
465 | } | |
466 | ||
467 | void *EC_KEY_get_key_method_data(EC_KEY *key, | |
468 | void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *)) | |
469 | { | |
470 | return EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func); | |
471 | } | |
472 | ||
473 | void EC_KEY_insert_key_method_data(EC_KEY *key, void *data, | |
474 | void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *)) | |
475 | { | |
476 | EC_EXTRA_DATA *ex_data; | |
477 | CRYPTO_w_lock(CRYPTO_LOCK_EC); | |
478 | ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func); | |
479 | if (ex_data == NULL) | |
480 | EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func); | |
481 | CRYPTO_w_unlock(CRYPTO_LOCK_EC); | |
482 | } | |
483 | ||
484 | void EC_KEY_set_asn1_flag(EC_KEY *key, int flag) | |
485 | { | |
486 | if (key->group != NULL) | |
487 | EC_GROUP_set_asn1_flag(key->group, flag); | |
488 | } | |
489 | ||
490 | int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx) | |
491 | { | |
492 | if (key->group == NULL) | |
493 | return 0; | |
494 | return EC_GROUP_precompute_mult(key->group, ctx); | |
495 | } |