1 /* $OpenBSD: ecs_lib.c,v 1.14 2022/08/31 13:01:01 tb Exp $ */
2 /* ====================================================================
3 * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. All advertising materials mentioning features or use of this
18 * software must display the following acknowledgment:
19 * "This product includes software developed by the OpenSSL Project
20 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21 *
22 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23 * endorse or promote products derived from this software without
24 * prior written permission. For written permission, please contact
25 * openssl-core@OpenSSL.org.
26 *
27 * 5. Products derived from this software may not be called "OpenSSL"
28 * nor may "OpenSSL" appear in their names without prior written
29 * permission of the OpenSSL Project.
30 *
31 * 6. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
40 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47 * OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * This product includes cryptographic software written by Eric Young
51 * (eay@cryptsoft.com). This product includes software written by Tim
52 * Hudson (tjh@cryptsoft.com).
53 *
54 */
55
56 #include <string.h>
57
58 #include <openssl/opensslconf.h>
59
60 #include "ecs_locl.h"
61 #ifndef OPENSSL_NO_ENGINE
62 #include <openssl/engine.h>
63 #endif
64 #include <openssl/err.h>
65 #include <openssl/bn.h>
66
67 static const ECDSA_METHOD *default_ECDSA_method = NULL;
68
69 static void *ecdsa_data_new(void);
70 static void *ecdsa_data_dup(void *);
71 static void ecdsa_data_free(void *);
72
73 void
ECDSA_set_default_method(const ECDSA_METHOD * meth)74 ECDSA_set_default_method(const ECDSA_METHOD *meth)
75 {
76 default_ECDSA_method = meth;
77 }
78
79 const ECDSA_METHOD *
ECDSA_get_default_method(void)80 ECDSA_get_default_method(void)
81 {
82 if (!default_ECDSA_method) {
83 default_ECDSA_method = ECDSA_OpenSSL();
84 }
85 return default_ECDSA_method;
86 }
87
88 int
ECDSA_set_method(EC_KEY * eckey,const ECDSA_METHOD * meth)89 ECDSA_set_method(EC_KEY *eckey, const ECDSA_METHOD *meth)
90 {
91 ECDSA_DATA *ecdsa;
92
93 ecdsa = ecdsa_check(eckey);
94
95 if (ecdsa == NULL)
96 return 0;
97
98 #ifndef OPENSSL_NO_ENGINE
99 ENGINE_finish(ecdsa->engine);
100 ecdsa->engine = NULL;
101 #endif
102 ecdsa->meth = meth;
103
104 return 1;
105 }
106
107 static ECDSA_DATA *
ECDSA_DATA_new_method(ENGINE * engine)108 ECDSA_DATA_new_method(ENGINE *engine)
109 {
110 ECDSA_DATA *ret;
111
112 ret = malloc(sizeof(ECDSA_DATA));
113 if (ret == NULL) {
114 ECDSAerror(ERR_R_MALLOC_FAILURE);
115 return (NULL);
116 }
117
118 ret->init = NULL;
119
120 ret->meth = ECDSA_get_default_method();
121 ret->engine = engine;
122 #ifndef OPENSSL_NO_ENGINE
123 if (!ret->engine)
124 ret->engine = ENGINE_get_default_ECDSA();
125 if (ret->engine) {
126 ret->meth = ENGINE_get_ECDSA(ret->engine);
127 if (ret->meth == NULL) {
128 ECDSAerror(ERR_R_ENGINE_LIB);
129 ENGINE_finish(ret->engine);
130 free(ret);
131 return NULL;
132 }
133 }
134 #endif
135
136 ret->flags = ret->meth->flags;
137 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
138 return (ret);
139 }
140
141 static void *
ecdsa_data_new(void)142 ecdsa_data_new(void)
143 {
144 return (void *)ECDSA_DATA_new_method(NULL);
145 }
146
147 static void *
ecdsa_data_dup(void * data)148 ecdsa_data_dup(void *data)
149 {
150 ECDSA_DATA *r = (ECDSA_DATA *)data;
151
152 /* XXX: dummy operation */
153 if (r == NULL)
154 return NULL;
155
156 return ecdsa_data_new();
157 }
158
159 static void
ecdsa_data_free(void * data)160 ecdsa_data_free(void *data)
161 {
162 ECDSA_DATA *r = (ECDSA_DATA *)data;
163
164 #ifndef OPENSSL_NO_ENGINE
165 ENGINE_finish(r->engine);
166 #endif
167 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, r, &r->ex_data);
168
169 freezero(r, sizeof(ECDSA_DATA));
170 }
171
172 ECDSA_DATA *
ecdsa_check(EC_KEY * key)173 ecdsa_check(EC_KEY *key)
174 {
175 ECDSA_DATA *ecdsa_data;
176
177 void *data = EC_KEY_get_key_method_data(key, ecdsa_data_dup,
178 ecdsa_data_free, ecdsa_data_free);
179 if (data == NULL) {
180 ecdsa_data = (ECDSA_DATA *)ecdsa_data_new();
181 if (ecdsa_data == NULL)
182 return NULL;
183 data = EC_KEY_insert_key_method_data(key, (void *)ecdsa_data,
184 ecdsa_data_dup, ecdsa_data_free, ecdsa_data_free);
185 if (data != NULL) {
186 /* Another thread raced us to install the key_method
187 * data and won. */
188 ecdsa_data_free(ecdsa_data);
189 ecdsa_data = (ECDSA_DATA *)data;
190 }
191 } else
192 ecdsa_data = (ECDSA_DATA *)data;
193
194 return ecdsa_data;
195 }
196
197 int
ECDSA_size(const EC_KEY * r)198 ECDSA_size(const EC_KEY *r)
199 {
200 BIGNUM *order = NULL;
201 const EC_GROUP *group;
202 ECDSA_SIG signature;
203 int ret = 0;
204
205 if (r == NULL)
206 goto err;
207
208 if ((group = EC_KEY_get0_group(r)) == NULL)
209 goto err;
210
211 if ((order = BN_new()) == NULL)
212 goto err;
213
214 if (!EC_GROUP_get_order(group, order, NULL))
215 goto err;
216
217 signature.r = order;
218 signature.s = order;
219
220 if ((ret = i2d_ECDSA_SIG(&signature, NULL)) < 0)
221 ret = 0;
222
223 err:
224 BN_clear_free(order);
225
226 return ret;
227 }
228
229 int
ECDSA_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)230 ECDSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
231 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
232 {
233 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDSA, argl, argp,
234 new_func, dup_func, free_func);
235 }
236
237 int
ECDSA_set_ex_data(EC_KEY * d,int idx,void * arg)238 ECDSA_set_ex_data(EC_KEY *d, int idx, void *arg)
239 {
240 ECDSA_DATA *ecdsa;
241 ecdsa = ecdsa_check(d);
242 if (ecdsa == NULL)
243 return 0;
244 return (CRYPTO_set_ex_data(&ecdsa->ex_data, idx, arg));
245 }
246
247 void *
ECDSA_get_ex_data(EC_KEY * d,int idx)248 ECDSA_get_ex_data(EC_KEY *d, int idx)
249 {
250 ECDSA_DATA *ecdsa;
251 ecdsa = ecdsa_check(d);
252 if (ecdsa == NULL)
253 return NULL;
254 return (CRYPTO_get_ex_data(&ecdsa->ex_data, idx));
255 }
256