Line data Source code
1 : /* crypto/ecdh/ech_lib.c */
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 "ech_locl.h"
71 : #include <string.h>
72 : #ifndef OPENSSL_NO_ENGINE
73 : # include <openssl/engine.h>
74 : #endif
75 : #include <openssl/err.h>
76 : #ifdef OPENSSL_FIPS
77 : # include <openssl/fips.h>
78 : #endif
79 :
80 : const char ECDH_version[] = "ECDH" OPENSSL_VERSION_PTEXT;
81 :
82 : static const ECDH_METHOD *default_ECDH_method = NULL;
83 :
84 : static void *ecdh_data_new(void);
85 : static void *ecdh_data_dup(void *);
86 : static void ecdh_data_free(void *);
87 :
88 0 : void ECDH_set_default_method(const ECDH_METHOD *meth)
89 : {
90 0 : default_ECDH_method = meth;
91 0 : }
92 :
93 0 : const ECDH_METHOD *ECDH_get_default_method(void)
94 : {
95 737 : if (!default_ECDH_method) {
96 : #ifdef OPENSSL_FIPS
97 : if (FIPS_mode())
98 : return FIPS_ecdh_openssl();
99 : else
100 : return ECDH_OpenSSL();
101 : #else
102 100 : default_ECDH_method = ECDH_OpenSSL();
103 : #endif
104 : }
105 737 : return default_ECDH_method;
106 : }
107 :
108 0 : int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)
109 : {
110 : ECDH_DATA *ecdh;
111 :
112 0 : ecdh = ecdh_check(eckey);
113 :
114 0 : if (ecdh == NULL)
115 : return 0;
116 :
117 : #if 0
118 : mtmp = ecdh->meth;
119 : if (mtmp->finish)
120 : mtmp->finish(eckey);
121 : #endif
122 : #ifndef OPENSSL_NO_ENGINE
123 0 : if (ecdh->engine) {
124 0 : ENGINE_finish(ecdh->engine);
125 0 : ecdh->engine = NULL;
126 : }
127 : #endif
128 0 : ecdh->meth = meth;
129 : #if 0
130 : if (meth->init)
131 : meth->init(eckey);
132 : #endif
133 0 : return 1;
134 : }
135 :
136 737 : static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
137 : {
138 : ECDH_DATA *ret;
139 :
140 737 : ret = (ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
141 737 : if (ret == NULL) {
142 0 : ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
143 0 : return (NULL);
144 : }
145 :
146 737 : ret->init = NULL;
147 :
148 737 : ret->meth = ECDH_get_default_method();
149 737 : ret->engine = engine;
150 : #ifndef OPENSSL_NO_ENGINE
151 737 : if (!ret->engine)
152 737 : ret->engine = ENGINE_get_default_ECDH();
153 737 : if (ret->engine) {
154 0 : ret->meth = ENGINE_get_ECDH(ret->engine);
155 0 : if (!ret->meth) {
156 0 : ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
157 0 : ENGINE_finish(ret->engine);
158 0 : OPENSSL_free(ret);
159 0 : return NULL;
160 : }
161 : }
162 : #endif
163 :
164 737 : ret->flags = ret->meth->flags;
165 737 : CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
166 : #if 0
167 : if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
168 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
169 : OPENSSL_free(ret);
170 : ret = NULL;
171 : }
172 : #endif
173 737 : return (ret);
174 : }
175 :
176 : static void *ecdh_data_new(void)
177 : {
178 737 : return (void *)ECDH_DATA_new_method(NULL);
179 : }
180 :
181 0 : static void *ecdh_data_dup(void *data)
182 : {
183 : ECDH_DATA *r = (ECDH_DATA *)data;
184 :
185 : /* XXX: dummy operation */
186 0 : if (r == NULL)
187 : return NULL;
188 :
189 0 : return (void *)ecdh_data_new();
190 : }
191 :
192 737 : void ecdh_data_free(void *data)
193 : {
194 : ECDH_DATA *r = (ECDH_DATA *)data;
195 :
196 : #ifndef OPENSSL_NO_ENGINE
197 737 : if (r->engine)
198 0 : ENGINE_finish(r->engine);
199 : #endif
200 :
201 737 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
202 :
203 737 : OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
204 :
205 737 : OPENSSL_free(r);
206 737 : }
207 :
208 737 : ECDH_DATA *ecdh_check(EC_KEY *key)
209 : {
210 : ECDH_DATA *ecdh_data;
211 :
212 737 : void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
213 : ecdh_data_free, ecdh_data_free);
214 737 : if (data == NULL) {
215 : ecdh_data = (ECDH_DATA *)ecdh_data_new();
216 737 : if (ecdh_data == NULL)
217 : return NULL;
218 737 : data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
219 : ecdh_data_dup, ecdh_data_free,
220 : ecdh_data_free);
221 737 : if (data != NULL) {
222 : /*
223 : * Another thread raced us to install the key_method data and
224 : * won.
225 : */
226 0 : ecdh_data_free(ecdh_data);
227 : ecdh_data = (ECDH_DATA *)data;
228 : }
229 : } else
230 : ecdh_data = (ECDH_DATA *)data;
231 : #ifdef OPENSSL_FIPS
232 : if (FIPS_mode() && !(ecdh_data->flags & ECDH_FLAG_FIPS_METHOD)
233 : && !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW)) {
234 : ECDHerr(ECDH_F_ECDH_CHECK, ECDH_R_NON_FIPS_METHOD);
235 : return NULL;
236 : }
237 : #endif
238 :
239 737 : return ecdh_data;
240 : }
241 :
242 0 : int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
243 : CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
244 : {
245 0 : return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
246 : new_func, dup_func, free_func);
247 : }
248 :
249 0 : int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
250 : {
251 : ECDH_DATA *ecdh;
252 0 : ecdh = ecdh_check(d);
253 0 : if (ecdh == NULL)
254 : return 0;
255 0 : return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg));
256 : }
257 :
258 0 : void *ECDH_get_ex_data(EC_KEY *d, int idx)
259 : {
260 : ECDH_DATA *ecdh;
261 0 : ecdh = ecdh_check(d);
262 0 : if (ecdh == NULL)
263 : return NULL;
264 0 : return (CRYPTO_get_ex_data(&ecdh->ex_data, idx));
265 : }
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