1 /* $OpenBSD: ech_lib.c,v 1.14 2018/04/14 07:09:21 tb Exp $ */
2 /* ====================================================================
3 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
4 *
5 * The Elliptic Curve Public-Key Crypto Library (ECC Code) included
6 * herein is developed by SUN MICROSYSTEMS, INC., and is contributed
7 * to the OpenSSL project.
8 *
9 * The ECC Code is licensed pursuant to the OpenSSL open source
10 * license provided below.
11 *
12 * The ECDH software is originally written by Douglas Stebila of
13 * Sun Microsystems Laboratories.
14 *
15 */
16 /* ====================================================================
17 * Copyright (c) 1998-2003 The OpenSSL Project. All rights reserved.
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 *
23 * 1. Redistributions of source code must retain the above copyright
24 * notice, this list of conditions and the following disclaimer.
25 *
26 * 2. Redistributions in binary form must reproduce the above copyright
27 * notice, this list of conditions and the following disclaimer in
28 * the documentation and/or other materials provided with the
29 * distribution.
30 *
31 * 3. All advertising materials mentioning features or use of this
32 * software must display the following acknowledgment:
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
35 *
36 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
37 * endorse or promote products derived from this software without
38 * prior written permission. For written permission, please contact
39 * openssl-core@OpenSSL.org.
40 *
41 * 5. Products derived from this software may not be called "OpenSSL"
42 * nor may "OpenSSL" appear in their names without prior written
43 * permission of the OpenSSL Project.
44 *
45 * 6. Redistributions of any form whatsoever must retain the following
46 * acknowledgment:
47 * "This product includes software developed by the OpenSSL Project
48 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
51 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
53 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
54 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
56 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
57 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
59 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
60 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
61 * OF THE POSSIBILITY OF SUCH DAMAGE.
62 * ====================================================================
63 *
64 * This product includes cryptographic software written by Eric Young
65 * (eay@cryptsoft.com). This product includes software written by Tim
66 * Hudson (tjh@cryptsoft.com).
67 *
68 */
69
70 #include <string.h>
71
72 #include <openssl/opensslconf.h>
73
74 #include "ech_locl.h"
75 #ifndef OPENSSL_NO_ENGINE
76 #include <openssl/engine.h>
77 #endif
78 #include <openssl/err.h>
79
80 static const ECDH_METHOD *default_ECDH_method = NULL;
81
82 static void *ecdh_data_new(void);
83 static void *ecdh_data_dup(void *);
84 static void ecdh_data_free(void *);
85
86 void
ECDH_set_default_method(const ECDH_METHOD * meth)87 ECDH_set_default_method(const ECDH_METHOD *meth)
88 {
89 default_ECDH_method = meth;
90 }
91
92 const ECDH_METHOD *
ECDH_get_default_method(void)93 ECDH_get_default_method(void)
94 {
95 if (!default_ECDH_method) {
96 default_ECDH_method = ECDH_OpenSSL();
97 }
98 return default_ECDH_method;
99 }
100
101 int
ECDH_set_method(EC_KEY * eckey,const ECDH_METHOD * meth)102 ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)
103 {
104 ECDH_DATA *ecdh;
105
106 ecdh = ecdh_check(eckey);
107
108 if (ecdh == NULL)
109 return 0;
110
111 #ifndef OPENSSL_NO_ENGINE
112 ENGINE_finish(ecdh->engine);
113 ecdh->engine = NULL;
114 #endif
115 ecdh->meth = meth;
116 return 1;
117 }
118
119 static ECDH_DATA *
ECDH_DATA_new_method(ENGINE * engine)120 ECDH_DATA_new_method(ENGINE *engine)
121 {
122 ECDH_DATA *ret;
123
124 ret = malloc(sizeof(ECDH_DATA));
125 if (ret == NULL) {
126 ECDHerror(ERR_R_MALLOC_FAILURE);
127 return (NULL);
128 }
129
130 ret->init = NULL;
131
132 ret->meth = ECDH_get_default_method();
133 ret->engine = engine;
134 #ifndef OPENSSL_NO_ENGINE
135 if (!ret->engine)
136 ret->engine = ENGINE_get_default_ECDH();
137 if (ret->engine) {
138 ret->meth = ENGINE_get_ECDH(ret->engine);
139 if (ret->meth == NULL) {
140 ECDHerror(ERR_R_ENGINE_LIB);
141 ENGINE_finish(ret->engine);
142 free(ret);
143 return NULL;
144 }
145 }
146 #endif
147
148 ret->flags = ret->meth->flags;
149 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
150 return (ret);
151 }
152
153 static void *
ecdh_data_new(void)154 ecdh_data_new(void)
155 {
156 return (void *)ECDH_DATA_new_method(NULL);
157 }
158
159 static void *
ecdh_data_dup(void * data)160 ecdh_data_dup(void *data)
161 {
162 ECDH_DATA *r = (ECDH_DATA *)data;
163
164 /* XXX: dummy operation */
165 if (r == NULL)
166 return NULL;
167
168 return (void *)ecdh_data_new();
169 }
170
171 void
ecdh_data_free(void * data)172 ecdh_data_free(void *data)
173 {
174 ECDH_DATA *r = (ECDH_DATA *)data;
175
176 #ifndef OPENSSL_NO_ENGINE
177 ENGINE_finish(r->engine);
178 #endif
179
180 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
181
182 freezero(r, sizeof(ECDH_DATA));
183 }
184
185 ECDH_DATA *
ecdh_check(EC_KEY * key)186 ecdh_check(EC_KEY *key)
187 {
188 ECDH_DATA *ecdh_data;
189
190 void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
191 ecdh_data_free, ecdh_data_free);
192 if (data == NULL) {
193 ecdh_data = (ECDH_DATA *)ecdh_data_new();
194 if (ecdh_data == NULL)
195 return NULL;
196 data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
197 ecdh_data_dup, ecdh_data_free, ecdh_data_free);
198 if (data != NULL) {
199 /* Another thread raced us to install the key_method
200 * data and won. */
201 ecdh_data_free(ecdh_data);
202 ecdh_data = (ECDH_DATA *)data;
203 }
204 } else
205 ecdh_data = (ECDH_DATA *)data;
206
207 return ecdh_data;
208 }
209
210 int
ECDH_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)211 ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
212 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
213 {
214 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
215 new_func, dup_func, free_func);
216 }
217
218 int
ECDH_set_ex_data(EC_KEY * d,int idx,void * arg)219 ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
220 {
221 ECDH_DATA *ecdh;
222 ecdh = ecdh_check(d);
223 if (ecdh == NULL)
224 return 0;
225 return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg));
226 }
227
228 void *
ECDH_get_ex_data(EC_KEY * d,int idx)229 ECDH_get_ex_data(EC_KEY *d, int idx)
230 {
231 ECDH_DATA *ecdh;
232 ecdh = ecdh_check(d);
233 if (ecdh == NULL)
234 return NULL;
235 return (CRYPTO_get_ex_data(&ecdh->ex_data, idx));
236 }
237
238 int
ECDH_size(const EC_KEY * d)239 ECDH_size(const EC_KEY *d)
240 {
241 return ((EC_GROUP_get_degree(EC_KEY_get0_group(d)) + 7) / 8);
242 }
243