ech_lib.c revision 296341 
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
80const char ECDH_version[] = "ECDH" OPENSSL_VERSION_PTEXT;
81
82static const ECDH_METHOD *default_ECDH_method = NULL;
83
84static void *ecdh_data_new(void);
85static void *ecdh_data_dup(void *);
86static void ecdh_data_free(void *);
87
88void ECDH_set_default_method(const ECDH_METHOD *meth)
89{
90    default_ECDH_method = meth;
91}
92
93const ECDH_METHOD *ECDH_get_default_method(void)
94{
95    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        default_ECDH_method = ECDH_OpenSSL();
103#endif
104    }
105    return default_ECDH_method;
106}
107
108int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)
109{
110    ECDH_DATA *ecdh;
111
112    ecdh = ecdh_check(eckey);
113
114    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    if (ecdh->engine) {
124        ENGINE_finish(ecdh->engine);
125        ecdh->engine = NULL;
126    }
127#endif
128    ecdh->meth = meth;
129#if 0
130    if (meth->init)
131        meth->init(eckey);
132#endif
133    return 1;
134}
135
136static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
137{
138    ECDH_DATA *ret;
139
140    ret = (ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
141    if (ret == NULL) {
142        ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
143        return (NULL);
144    }
145
146    ret->init = NULL;
147
148    ret->meth = ECDH_get_default_method();
149    ret->engine = engine;
150#ifndef OPENSSL_NO_ENGINE
151    if (!ret->engine)
152        ret->engine = ENGINE_get_default_ECDH();
153    if (ret->engine) {
154        ret->meth = ENGINE_get_ECDH(ret->engine);
155        if (!ret->meth) {
156            ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
157            ENGINE_finish(ret->engine);
158            OPENSSL_free(ret);
159            return NULL;
160        }
161    }
162#endif
163
164    ret->flags = ret->meth->flags;
165    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    return (ret);
174}
175
176static void *ecdh_data_new(void)
177{
178    return (void *)ECDH_DATA_new_method(NULL);
179}
180
181static void *ecdh_data_dup(void *data)
182{
183    ECDH_DATA *r = (ECDH_DATA *)data;
184
185    /* XXX: dummy operation */
186    if (r == NULL)
187        return NULL;
188
189    return (void *)ecdh_data_new();
190}
191
192void ecdh_data_free(void *data)
193{
194    ECDH_DATA *r = (ECDH_DATA *)data;
195
196#ifndef OPENSSL_NO_ENGINE
197    if (r->engine)
198        ENGINE_finish(r->engine);
199#endif
200
201    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
202
203    OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
204
205    OPENSSL_free(r);
206}
207
208ECDH_DATA *ecdh_check(EC_KEY *key)
209{
210    ECDH_DATA *ecdh_data;
211
212    void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
213                                            ecdh_data_free, ecdh_data_free);
214    if (data == NULL) {
215        ecdh_data = (ECDH_DATA *)ecdh_data_new();
216        if (ecdh_data == NULL)
217            return NULL;
218        data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
219                                             ecdh_data_dup, ecdh_data_free,
220                                             ecdh_data_free);
221        if (data != NULL) {
222            /*
223             * Another thread raced us to install the key_method data and
224             * won.
225             */
226            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    return ecdh_data;
240}
241
242int 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    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
246                                   new_func, dup_func, free_func);
247}
248
249int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
250{
251    ECDH_DATA *ecdh;
252    ecdh = ecdh_check(d);
253    if (ecdh == NULL)
254        return 0;
255    return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg));
256}
257
258void *ECDH_get_ex_data(EC_KEY *d, int idx)
259{
260    ECDH_DATA *ecdh;
261    ecdh = ecdh_check(d);
262    if (ecdh == NULL)
263        return NULL;
264    return (CRYPTO_get_ex_data(&ecdh->ex_data, idx));
265}
266