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Diffstat (limited to 'src/lib/libcrypto/ec/ec_key.c')
-rw-r--r--src/lib/libcrypto/ec/ec_key.c463
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diff --git a/src/lib/libcrypto/ec/ec_key.c b/src/lib/libcrypto/ec/ec_key.c
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index 522802c07a..0000000000
--- a/src/lib/libcrypto/ec/ec_key.c
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1/* crypto/ec/ec_key.c */
2/*
3 * Written by Nils Larsch for the OpenSSL project.
4 */
5/* ====================================================================
6 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
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 */
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 */
63
64#include <string.h>
65#include "ec_lcl.h"
66#include <openssl/err.h>
67#include <string.h>
68
69EC_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 {
76 ECerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE);
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;
87 ret->method_data = NULL;
88 return(ret);
89 }
90
91EC_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 }
104
105void 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
131 EC_EX_DATA_free_all_data(&r->method_data);
132
133 OPENSSL_cleanse((void *)r, sizeof(EC_KEY));
134
135 OPENSSL_free(r);
136 }
137
138EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
139 {
140 EC_EXTRA_DATA *d;
141
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 }
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
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
204EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
205 {
206 EC_KEY *ret = EC_KEY_new();
207 if (ret == NULL)
208 return NULL;
209 if (EC_KEY_copy(ret, ec_key) == NULL)
210 {
211 EC_KEY_free(ret);
212 return NULL;
213 }
214 return ret;
215 }
216
217int EC_KEY_up_ref(EC_KEY *r)
218 {
219 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
220#ifdef REF_PRINT
221 REF_PRINT("EC_KEY",r);
222#endif
223#ifdef REF_CHECK
224 if (i < 2)
225 {
226 fprintf(stderr, "EC_KEY_up, bad reference count\n");
227 abort();
228 }
229#endif
230 return ((i > 1) ? 1 : 0);
231 }
232
233int EC_KEY_generate_key(EC_KEY *eckey)
234 {
235 int ok = 0;
236 BN_CTX *ctx = NULL;
237 BIGNUM *priv_key = NULL, *order = NULL;
238 EC_POINT *pub_key = NULL;
239
240 if (!eckey || !eckey->group)
241 {
242 ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
243 return 0;
244 }
245
246 if ((order = BN_new()) == NULL) goto err;
247 if ((ctx = BN_CTX_new()) == NULL) goto err;
248
249 if (eckey->priv_key == NULL)
250 {
251 priv_key = BN_new();
252 if (priv_key == NULL)
253 goto err;
254 }
255 else
256 priv_key = eckey->priv_key;
257
258 if (!EC_GROUP_get_order(eckey->group, order, ctx))
259 goto err;
260
261 do
262 if (!BN_rand_range(priv_key, order))
263 goto err;
264 while (BN_is_zero(priv_key));
265
266 if (eckey->pub_key == NULL)
267 {
268 pub_key = EC_POINT_new(eckey->group);
269 if (pub_key == NULL)
270 goto err;
271 }
272 else
273 pub_key = eckey->pub_key;
274
275 if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
276 goto err;
277
278 eckey->priv_key = priv_key;
279 eckey->pub_key = pub_key;
280
281 ok=1;
282
283err:
284 if (order)
285 BN_free(order);
286 if (pub_key != NULL && eckey->pub_key == NULL)
287 EC_POINT_free(pub_key);
288 if (priv_key != NULL && eckey->priv_key == NULL)
289 BN_free(priv_key);
290 if (ctx != NULL)
291 BN_CTX_free(ctx);
292 return(ok);
293 }
294
295int EC_KEY_check_key(const EC_KEY *eckey)
296 {
297 int ok = 0;
298 BN_CTX *ctx = NULL;
299 const BIGNUM *order = NULL;
300 EC_POINT *point = NULL;
301
302 if (!eckey || !eckey->group || !eckey->pub_key)
303 {
304 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
305 return 0;
306 }
307
308 if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key))
309 {
310 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY);
311 goto err;
312 }
313
314 if ((ctx = BN_CTX_new()) == NULL)
315 goto err;
316 if ((point = EC_POINT_new(eckey->group)) == NULL)
317 goto err;
318
319 /* testing whether the pub_key is on the elliptic curve */
320 if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx))
321 {
322 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
323 goto err;
324 }
325 /* testing whether pub_key * order is the point at infinity */
326 order = &eckey->group->order;
327 if (BN_is_zero(order))
328 {
329 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
330 goto err;
331 }
332 if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx))
333 {
334 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
335 goto err;
336 }
337 if (!EC_POINT_is_at_infinity(eckey->group, point))
338 {
339 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
340 goto err;
341 }
342 /* in case the priv_key is present :
343 * check if generator * priv_key == pub_key
344 */
345 if (eckey->priv_key)
346 {
347 if (BN_cmp(eckey->priv_key, order) >= 0)
348 {
349 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
350 goto err;
351 }
352 if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
353 NULL, NULL, ctx))
354 {
355 ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
356 goto err;
357 }
358 if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
359 ctx) != 0)
360 {
361 ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
362 goto err;
363 }
364 }
365 ok = 1;
366err:
367 if (ctx != NULL)
368 BN_CTX_free(ctx);
369 if (point != NULL)
370 EC_POINT_free(point);
371 return(ok);
372 }
373
374const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
375 {
376 return key->group;
377 }
378
379int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
380 {
381 if (key->group != NULL)
382 EC_GROUP_free(key->group);
383 key->group = EC_GROUP_dup(group);
384 return (key->group == NULL) ? 0 : 1;
385 }
386
387const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
388 {
389 return key->priv_key;
390 }
391
392int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
393 {
394 if (key->priv_key)
395 BN_clear_free(key->priv_key);
396 key->priv_key = BN_dup(priv_key);
397 return (key->priv_key == NULL) ? 0 : 1;
398 }
399
400const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
401 {
402 return key->pub_key;
403 }
404
405int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
406 {
407 if (key->pub_key != NULL)
408 EC_POINT_free(key->pub_key);
409 key->pub_key = EC_POINT_dup(pub_key, key->group);
410 return (key->pub_key == NULL) ? 0 : 1;
411 }
412
413unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
414 {
415 return key->enc_flag;
416 }
417
418void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
419 {
420 key->enc_flag = flags;
421 }
422
423point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
424 {
425 return key->conv_form;
426 }
427
428void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
429 {
430 key->conv_form = cform;
431 if (key->group != NULL)
432 EC_GROUP_set_point_conversion_form(key->group, cform);
433 }
434
435void *EC_KEY_get_key_method_data(EC_KEY *key,
436 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
437 {
438 return EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
439 }
440
441void EC_KEY_insert_key_method_data(EC_KEY *key, void *data,
442 void *(*dup_func)(void *), void (*free_func)(void *), void (*clear_free_func)(void *))
443 {
444 EC_EXTRA_DATA *ex_data;
445 CRYPTO_w_lock(CRYPTO_LOCK_EC);
446 ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
447 if (ex_data == NULL)
448 EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func);
449 CRYPTO_w_unlock(CRYPTO_LOCK_EC);
450 }
451
452void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
453 {
454 if (key->group != NULL)
455 EC_GROUP_set_asn1_flag(key->group, flag);
456 }
457
458int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
459 {
460 if (key->group == NULL)
461 return 0;
462 return EC_GROUP_precompute_mult(key->group, ctx);
463 }
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