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diff --git a/src/lib/libcrypto/gost/gostr341001_key.c b/src/lib/libcrypto/gost/gostr341001_key.c
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1/* $OpenBSD: gostr341001_key.c,v 1.6 2015/09/10 15:56:25 jsing Exp $ */
2/*
3 * Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
4 * Copyright (c) 2005-2006 Cryptocom LTD
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 *
18 * 3. All advertising materials mentioning features or use of this
19 * software must display the following acknowledgment:
20 * "This product includes software developed by the OpenSSL Project
21 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
22 *
23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
24 * endorse or promote products derived from this software without
25 * prior written permission. For written permission, please contact
26 * openssl-core@openssl.org.
27 *
28 * 5. Products derived from this software may not be called "OpenSSL"
29 * nor may "OpenSSL" appear in their names without prior written
30 * permission of the OpenSSL Project.
31 *
32 * 6. Redistributions of any form whatsoever must retain the following
33 * acknowledgment:
34 * "This product includes software developed by the OpenSSL Project
35 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
36 *
37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
48 * OF THE POSSIBILITY OF SUCH DAMAGE.
49 * ====================================================================
50 */
51
52#include <string.h>
53
54#include <openssl/opensslconf.h>
55
56#ifndef OPENSSL_NO_GOST
57#include <openssl/bn.h>
58#include <openssl/err.h>
59#include <openssl/gost.h>
60#include <openssl/objects.h>
61#include "gost_locl.h"
62
63struct gost_key_st {
64 EC_GROUP *group;
65
66 EC_POINT *pub_key;
67 BIGNUM *priv_key;
68
69 int references;
70
71 int digest_nid;
72};
73
74GOST_KEY *
75GOST_KEY_new(void)
76{
77 GOST_KEY *ret;
78
79 ret = malloc(sizeof(GOST_KEY));
80 if (ret == NULL) {
81 GOSTerr(GOST_F_GOST_KEY_NEW, ERR_R_MALLOC_FAILURE);
82 return (NULL);
83 }
84 ret->group = NULL;
85 ret->pub_key = NULL;
86 ret->priv_key = NULL;
87 ret->references = 1;
88 ret->digest_nid = NID_undef;
89 return (ret);
90}
91
92void
93GOST_KEY_free(GOST_KEY *r)
94{
95 int i;
96
97 if (r == NULL)
98 return;
99
100 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_EC);
101 if (i > 0)
102 return;
103
104 EC_GROUP_free(r->group);
105 EC_POINT_free(r->pub_key);
106 BN_clear_free(r->priv_key);
107
108 explicit_bzero((void *)r, sizeof(GOST_KEY));
109 free(r);
110}
111
112int
113GOST_KEY_check_key(const GOST_KEY *key)
114{
115 int ok = 0;
116 BN_CTX *ctx = NULL;
117 BIGNUM *order = NULL;
118 EC_POINT *point = NULL;
119
120 if (key == NULL || key->group == NULL || key->pub_key == NULL) {
121 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
122 return 0;
123 }
124 if (EC_POINT_is_at_infinity(key->group, key->pub_key) != 0) {
125 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY);
126 goto err;
127 }
128 if ((ctx = BN_CTX_new()) == NULL)
129 goto err;
130 if ((point = EC_POINT_new(key->group)) == NULL)
131 goto err;
132
133 /* testing whether the pub_key is on the elliptic curve */
134 if (EC_POINT_is_on_curve(key->group, key->pub_key, ctx) == 0) {
135 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
136 goto err;
137 }
138 /* testing whether pub_key * order is the point at infinity */
139 if ((order = BN_new()) == NULL)
140 goto err;
141 if (EC_GROUP_get_order(key->group, order, ctx) == 0) {
142 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
143 goto err;
144 }
145 if (EC_POINT_mul(key->group, point, NULL, key->pub_key, order,
146 ctx) == 0) {
147 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, ERR_R_EC_LIB);
148 goto err;
149 }
150 if (EC_POINT_is_at_infinity(key->group, point) == 0) {
151 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
152 goto err;
153 }
154 /*
155 * in case the priv_key is present : check if generator * priv_key ==
156 * pub_key
157 */
158 if (key->priv_key != NULL) {
159 if (BN_cmp(key->priv_key, order) >= 0) {
160 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
161 goto err;
162 }
163 if (EC_POINT_mul(key->group, point, key->priv_key, NULL, NULL,
164 ctx) == 0) {
165 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY, ERR_R_EC_LIB);
166 goto err;
167 }
168 if (EC_POINT_cmp(key->group, point, key->pub_key, ctx) != 0) {
169 GOSTerr(GOST_F_GOST_KEY_CHECK_KEY,
170 EC_R_INVALID_PRIVATE_KEY);
171 goto err;
172 }
173 }
174 ok = 1;
175err:
176 BN_free(order);
177 BN_CTX_free(ctx);
178 EC_POINT_free(point);
179 return (ok);
180}
181
182int
183GOST_KEY_set_public_key_affine_coordinates(GOST_KEY *key, BIGNUM *x, BIGNUM *y)
184{
185 BN_CTX *ctx = NULL;
186 BIGNUM *tx, *ty;
187 EC_POINT *point = NULL;
188 int ok = 0;
189
190 if (key == NULL || key->group == NULL || x == NULL || y == NULL) {
191 GOSTerr(GOST_F_GOST_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
192 ERR_R_PASSED_NULL_PARAMETER);
193 return 0;
194 }
195 ctx = BN_CTX_new();
196 if (ctx == NULL)
197 goto err;
198
199 point = EC_POINT_new(key->group);
200 if (point == NULL)
201 goto err;
202
203 if ((tx = BN_CTX_get(ctx)) == NULL)
204 goto err;
205 if ((ty = BN_CTX_get(ctx)) == NULL)
206 goto err;
207 if (EC_POINT_set_affine_coordinates_GFp(key->group, point, x, y,
208 ctx) == 0)
209 goto err;
210 if (EC_POINT_get_affine_coordinates_GFp(key->group, point, tx, ty,
211 ctx) == 0)
212 goto err;
213 /*
214 * Check if retrieved coordinates match originals: if not, values are
215 * out of range.
216 */
217 if (BN_cmp(x, tx) != 0 || BN_cmp(y, ty) != 0) {
218 GOSTerr(GOST_F_GOST_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
219 EC_R_COORDINATES_OUT_OF_RANGE);
220 goto err;
221 }
222 if (GOST_KEY_set_public_key(key, point) == 0)
223 goto err;
224
225 if (GOST_KEY_check_key(key) == 0)
226 goto err;
227
228 ok = 1;
229
230err:
231 EC_POINT_free(point);
232 BN_CTX_free(ctx);
233 return ok;
234
235}
236
237const EC_GROUP *
238GOST_KEY_get0_group(const GOST_KEY *key)
239{
240 return key->group;
241}
242
243int
244GOST_KEY_set_group(GOST_KEY *key, const EC_GROUP *group)
245{
246 EC_GROUP_free(key->group);
247 key->group = EC_GROUP_dup(group);
248 return (key->group == NULL) ? 0 : 1;
249}
250
251const BIGNUM *
252GOST_KEY_get0_private_key(const GOST_KEY *key)
253{
254 return key->priv_key;
255}
256
257int
258GOST_KEY_set_private_key(GOST_KEY *key, const BIGNUM *priv_key)
259{
260 BN_clear_free(key->priv_key);
261 key->priv_key = BN_dup(priv_key);
262 return (key->priv_key == NULL) ? 0 : 1;
263}
264
265const EC_POINT *
266GOST_KEY_get0_public_key(const GOST_KEY *key)
267{
268 return key->pub_key;
269}
270
271int
272GOST_KEY_set_public_key(GOST_KEY *key, const EC_POINT *pub_key)
273{
274 EC_POINT_free(key->pub_key);
275 key->pub_key = EC_POINT_dup(pub_key, key->group);
276 return (key->pub_key == NULL) ? 0 : 1;
277}
278
279int
280GOST_KEY_get_digest(const GOST_KEY *key)
281{
282 return key->digest_nid;
283}
284int
285GOST_KEY_set_digest(GOST_KEY *key, int digest_nid)
286{
287 if (digest_nid == NID_id_GostR3411_94_CryptoProParamSet ||
288 digest_nid == NID_id_tc26_gost3411_2012_256 ||
289 digest_nid == NID_id_tc26_gost3411_2012_512) {
290 key->digest_nid = digest_nid;
291 return 1;
292 }
293
294 return 0;
295}
296
297size_t
298GOST_KEY_get_size(const GOST_KEY *r)
299{
300 int i;
301 BIGNUM *order = NULL;
302 const EC_GROUP *group;
303
304 if (r == NULL)
305 return 0;
306 group = GOST_KEY_get0_group(r);
307 if (group == NULL)
308 return 0;
309
310 if ((order = BN_new()) == NULL)
311 return 0;
312
313 if (EC_GROUP_get_order(group, order, NULL) == 0) {
314 BN_clear_free(order);
315 return 0;
316 }
317
318 i = BN_num_bytes(order);
319 BN_clear_free(order);
320 return (i);
321}
322#endif