GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/ec/ec_key.c Lines: 100 209 47.8 %
Date: 2017-11-13 Branches: 39 148 26.4 %

Line Branch Exec Source
1
/* $OpenBSD: ec_key.c,v 1.14 2017/05/02 03:59:44 deraadt Exp $ */
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
66
#include <openssl/opensslconf.h>
67
68
#include "ec_lcl.h"
69
#include <openssl/err.h>
70
71
EC_KEY *
72
EC_KEY_new(void)
73
{
74
	EC_KEY *ret;
75
76
7786
	ret = malloc(sizeof(EC_KEY));
77
3893
	if (ret == NULL) {
78
		ECerror(ERR_R_MALLOC_FAILURE);
79
		return (NULL);
80
	}
81
3893
	ret->version = 1;
82
3893
	ret->flags = 0;
83
3893
	ret->group = NULL;
84
3893
	ret->pub_key = NULL;
85
3893
	ret->priv_key = NULL;
86
3893
	ret->enc_flag = 0;
87
3893
	ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
88
3893
	ret->references = 1;
89
3893
	ret->method_data = NULL;
90
3893
	return (ret);
91
3893
}
92
93
EC_KEY *
94
EC_KEY_new_by_curve_name(int nid)
95
{
96
1034
	EC_KEY *ret = EC_KEY_new();
97
517
	if (ret == NULL)
98
		return NULL;
99
517
	ret->group = EC_GROUP_new_by_curve_name(nid);
100
517
	if (ret->group == NULL) {
101
		EC_KEY_free(ret);
102
		return NULL;
103
	}
104
517
	return ret;
105
517
}
106
107
void
108
EC_KEY_free(EC_KEY * r)
109
{
110
	int i;
111
112
64386
	if (r == NULL)
113
27932
		return;
114
115
4261
	i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC);
116
4261
	if (i > 0)
117
368
		return;
118
119
3893
	EC_GROUP_free(r->group);
120
3893
	EC_POINT_free(r->pub_key);
121
3893
	BN_clear_free(r->priv_key);
122
123
3893
	EC_EX_DATA_free_all_data(&r->method_data);
124
125
3893
	freezero(r, sizeof(EC_KEY));
126
36086
}
127
128
EC_KEY *
129
EC_KEY_copy(EC_KEY * dest, const EC_KEY * src)
130
{
131
	EC_EXTRA_DATA *d;
132
133
	if (dest == NULL || src == NULL) {
134
		ECerror(ERR_R_PASSED_NULL_PARAMETER);
135
		return NULL;
136
	}
137
	/* copy the parameters */
138
	if (src->group) {
139
		const EC_METHOD *meth = EC_GROUP_method_of(src->group);
140
		/* clear the old group */
141
		EC_GROUP_free(dest->group);
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 */
149
	if (src->pub_key && src->group) {
150
		EC_POINT_free(dest->pub_key);
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 */
158
	if (src->priv_key) {
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
	}
167
	/* copy method/extra data */
168
	EC_EX_DATA_free_all_data(&dest->method_data);
169
170
	for (d = src->method_data; d != NULL; d = d->next) {
171
		void *t = d->dup_func(d->data);
172
173
		if (t == NULL)
174
			return 0;
175
		if (!EC_EX_DATA_set_data(&dest->method_data, t, d->dup_func,
176
		    d->free_func, d->clear_free_func))
177
			return 0;
178
	}
179
180
	/* copy the rest */
181
	dest->enc_flag = src->enc_flag;
182
	dest->conv_form = src->conv_form;
183
	dest->version = src->version;
184
	dest->flags = src->flags;
185
186
	return dest;
187
}
188
189
EC_KEY *
190
EC_KEY_dup(const EC_KEY * ec_key)
191
{
192
	EC_KEY *ret = EC_KEY_new();
193
	if (ret == NULL)
194
		return NULL;
195
	if (EC_KEY_copy(ret, ec_key) == NULL) {
196
		EC_KEY_free(ret);
197
		return NULL;
198
	}
199
	return ret;
200
}
201
202
int
203
EC_KEY_up_ref(EC_KEY * r)
204
{
205
736
	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_EC);
206
368
	return ((i > 1) ? 1 : 0);
207
}
208
209
int
210
EC_KEY_generate_key(EC_KEY * eckey)
211
{
212
	int ok = 0;
213
	BN_CTX *ctx = NULL;
214
	BIGNUM *priv_key = NULL, *order = NULL;
215
	EC_POINT *pub_key = NULL;
216
217

6186
	if (!eckey || !eckey->group) {
218
		ECerror(ERR_R_PASSED_NULL_PARAMETER);
219
		return 0;
220
	}
221
2062
	if ((order = BN_new()) == NULL)
222
		goto err;
223
2062
	if ((ctx = BN_CTX_new()) == NULL)
224
		goto err;
225
226
2062
	if (eckey->priv_key == NULL) {
227
2062
		priv_key = BN_new();
228
2062
		if (priv_key == NULL)
229
			goto err;
230
	} else
231
		priv_key = eckey->priv_key;
232
233
2062
	if (!EC_GROUP_get_order(eckey->group, order, ctx))
234
		goto err;
235
236
2062
	do
237

4124
		if (!BN_rand_range(priv_key, order))
238
			goto err;
239
2062
	while (BN_is_zero(priv_key));
240
241
2062
	if (eckey->pub_key == NULL) {
242
2062
		pub_key = EC_POINT_new(eckey->group);
243
2062
		if (pub_key == NULL)
244
			goto err;
245
	} else
246
		pub_key = eckey->pub_key;
247
248
2062
	if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
249
		goto err;
250
251
2062
	eckey->priv_key = priv_key;
252
2062
	eckey->pub_key = pub_key;
253
254
2062
	ok = 1;
255
256
err:
257
2062
	BN_free(order);
258

4124
	if (pub_key != NULL && eckey->pub_key == NULL)
259
		EC_POINT_free(pub_key);
260

4124
	if (priv_key != NULL && eckey->priv_key == NULL)
261
		BN_free(priv_key);
262
2062
	BN_CTX_free(ctx);
263
2062
	return (ok);
264
2062
}
265
266
int
267
EC_KEY_check_key(const EC_KEY * eckey)
268
{
269
	int ok = 0;
270
	BN_CTX *ctx = NULL;
271
	const BIGNUM *order = NULL;
272
	EC_POINT *point = NULL;
273
274

1616
	if (!eckey || !eckey->group || !eckey->pub_key) {
275
		ECerror(ERR_R_PASSED_NULL_PARAMETER);
276
		return 0;
277
	}
278
404
	if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key) > 0) {
279
		ECerror(EC_R_POINT_AT_INFINITY);
280
		goto err;
281
	}
282
404
	if ((ctx = BN_CTX_new()) == NULL)
283
		goto err;
284
404
	if ((point = EC_POINT_new(eckey->group)) == NULL)
285
		goto err;
286
287
	/* testing whether the pub_key is on the elliptic curve */
288
404
	if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
289
		ECerror(EC_R_POINT_IS_NOT_ON_CURVE);
290
		goto err;
291
	}
292
	/* testing whether pub_key * order is the point at infinity */
293
404
	order = &eckey->group->order;
294
404
	if (BN_is_zero(order)) {
295
		ECerror(EC_R_INVALID_GROUP_ORDER);
296
		goto err;
297
	}
298
404
	if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
299
		ECerror(ERR_R_EC_LIB);
300
		goto err;
301
	}
302
404
	if (EC_POINT_is_at_infinity(eckey->group, point) <= 0) {
303
		ECerror(EC_R_WRONG_ORDER);
304
		goto err;
305
	}
306
	/*
307
	 * in case the priv_key is present : check if generator * priv_key ==
308
	 * pub_key
309
	 */
310
404
	if (eckey->priv_key) {
311
316
		if (BN_cmp(eckey->priv_key, order) >= 0) {
312
			ECerror(EC_R_WRONG_ORDER);
313
			goto err;
314
		}
315
316
		if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
316
			NULL, NULL, ctx)) {
317
			ECerror(ERR_R_EC_LIB);
318
			goto err;
319
		}
320
632
		if (EC_POINT_cmp(eckey->group, point, eckey->pub_key,
321
316
			ctx) != 0) {
322
			ECerror(EC_R_INVALID_PRIVATE_KEY);
323
			goto err;
324
		}
325
	}
326
404
	ok = 1;
327
err:
328
404
	BN_CTX_free(ctx);
329
404
	EC_POINT_free(point);
330
404
	return (ok);
331
404
}
332
333
int
334
EC_KEY_set_public_key_affine_coordinates(EC_KEY * key, BIGNUM * x, BIGNUM * y)
335
{
336
	BN_CTX *ctx = NULL;
337
	BIGNUM *tx, *ty;
338
	EC_POINT *point = NULL;
339
	int ok = 0, tmp_nid, is_char_two = 0;
340
341
	if (!key || !key->group || !x || !y) {
342
		ECerror(ERR_R_PASSED_NULL_PARAMETER);
343
		return 0;
344
	}
345
	ctx = BN_CTX_new();
346
	if (!ctx)
347
		goto err;
348
349
	point = EC_POINT_new(key->group);
350
351
	if (!point)
352
		goto err;
353
354
	tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group));
355
356
	if (tmp_nid == NID_X9_62_characteristic_two_field)
357
		is_char_two = 1;
358
359
	if ((tx = BN_CTX_get(ctx)) == NULL)
360
		goto err;
361
	if ((ty = BN_CTX_get(ctx)) == NULL)
362
		goto err;
363
364
#ifndef OPENSSL_NO_EC2M
365
	if (is_char_two) {
366
		if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point,
367
			x, y, ctx))
368
			goto err;
369
		if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point,
370
			tx, ty, ctx))
371
			goto err;
372
	} else
373
#endif
374
	{
375
		if (!EC_POINT_set_affine_coordinates_GFp(key->group, point,
376
			x, y, ctx))
377
			goto err;
378
		if (!EC_POINT_get_affine_coordinates_GFp(key->group, point,
379
			tx, ty, ctx))
380
			goto err;
381
	}
382
	/*
383
	 * Check if retrieved coordinates match originals: if not values are
384
	 * out of range.
385
	 */
386
	if (BN_cmp(x, tx) || BN_cmp(y, ty)) {
387
		ECerror(EC_R_COORDINATES_OUT_OF_RANGE);
388
		goto err;
389
	}
390
	if (!EC_KEY_set_public_key(key, point))
391
		goto err;
392
393
	if (EC_KEY_check_key(key) == 0)
394
		goto err;
395
396
	ok = 1;
397
398
err:
399
	BN_CTX_free(ctx);
400
	EC_POINT_free(point);
401
	return ok;
402
403
}
404
405
const EC_GROUP *
406
EC_KEY_get0_group(const EC_KEY * key)
407
{
408
19186
	return key->group;
409
}
410
411
int
412
EC_KEY_set_group(EC_KEY * key, const EC_GROUP * group)
413
{
414
6380
	EC_GROUP_free(key->group);
415
3190
	key->group = EC_GROUP_dup(group);
416
3190
	return (key->group == NULL) ? 0 : 1;
417
}
418
419
const BIGNUM *
420
EC_KEY_get0_private_key(const EC_KEY * key)
421
{
422
3980
	return key->priv_key;
423
}
424
425
int
426
EC_KEY_set_private_key(EC_KEY * key, const BIGNUM * priv_key)
427
{
428
174
	BN_clear_free(key->priv_key);
429
87
	key->priv_key = BN_dup(priv_key);
430
87
	return (key->priv_key == NULL) ? 0 : 1;
431
}
432
433
const EC_POINT *
434
EC_KEY_get0_public_key(const EC_KEY * key)
435
{
436
10420
	return key->pub_key;
437
}
438
439
int
440
EC_KEY_set_public_key(EC_KEY * key, const EC_POINT * pub_key)
441
{
442
2566
	EC_POINT_free(key->pub_key);
443
1283
	key->pub_key = EC_POINT_dup(pub_key, key->group);
444
1283
	return (key->pub_key == NULL) ? 0 : 1;
445
}
446
447
unsigned int
448
EC_KEY_get_enc_flags(const EC_KEY * key)
449
{
450
8
	return key->enc_flag;
451
}
452
453
void
454
EC_KEY_set_enc_flags(EC_KEY * key, unsigned int flags)
455
{
456
16
	key->enc_flag = flags;
457
8
}
458
459
point_conversion_form_t
460
EC_KEY_get_conv_form(const EC_KEY * key)
461
{
462
364
	return key->conv_form;
463
}
464
465
void
466
EC_KEY_set_conv_form(EC_KEY * key, point_conversion_form_t cform)
467
{
468
	key->conv_form = cform;
469
	if (key->group != NULL)
470
		EC_GROUP_set_point_conversion_form(key->group, cform);
471
}
472
473
void *
474
EC_KEY_get_key_method_data(EC_KEY *key,
475
    void *(*dup_func) (void *),
476
    void (*free_func) (void *),
477
    void (*clear_free_func) (void *))
478
{
479
	void *ret;
480
481
6356
	CRYPTO_r_lock(CRYPTO_LOCK_EC);
482
3178
	ret = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
483
3178
	CRYPTO_r_unlock(CRYPTO_LOCK_EC);
484
485
3178
	return ret;
486
}
487
488
void *
489
EC_KEY_insert_key_method_data(EC_KEY * key, void *data,
490
    void *(*dup_func) (void *),
491
    void (*free_func) (void *),
492
    void (*clear_free_func) (void *))
493
{
494
	EC_EXTRA_DATA *ex_data;
495
496
3620
	CRYPTO_w_lock(CRYPTO_LOCK_EC);
497
1810
	ex_data = EC_EX_DATA_get_data(key->method_data, dup_func, free_func, clear_free_func);
498
1810
	if (ex_data == NULL)
499
1810
		EC_EX_DATA_set_data(&key->method_data, data, dup_func, free_func, clear_free_func);
500
1810
	CRYPTO_w_unlock(CRYPTO_LOCK_EC);
501
502
1810
	return ex_data;
503
}
504
505
void
506
EC_KEY_set_asn1_flag(EC_KEY * key, int flag)
507
{
508
	if (key->group != NULL)
509
		EC_GROUP_set_asn1_flag(key->group, flag);
510
}
511
512
int
513
EC_KEY_precompute_mult(EC_KEY * key, BN_CTX * ctx)
514
{
515
	if (key->group == NULL)
516
		return 0;
517
	return EC_GROUP_precompute_mult(key->group, ctx);
518
}
519
520
int
521
EC_KEY_get_flags(const EC_KEY * key)
522
{
523
	return key->flags;
524
}
525
526
void
527
EC_KEY_set_flags(EC_KEY * key, int flags)
528
{
529
	key->flags |= flags;
530
}
531
532
void
533
EC_KEY_clear_flags(EC_KEY * key, int flags)
534
{
535
	key->flags &= ~flags;
536
}