ech_lib.c revision 296465 
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
77const char ECDH_version[] = "ECDH" OPENSSL_VERSION_PTEXT;
78
79static const ECDH_METHOD *default_ECDH_method = NULL;
80
81static void *ecdh_data_new(void);
82static void *ecdh_data_dup(void *);
83static void ecdh_data_free(void *);
84
85void ECDH_set_default_method(const ECDH_METHOD *meth)
86{
87    default_ECDH_method = meth;
88}
89
90const ECDH_METHOD *ECDH_get_default_method(void)
91{
92    if (!default_ECDH_method)
93        default_ECDH_method = ECDH_OpenSSL();
94    return default_ECDH_method;
95}
96
97int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)
98{
99    ECDH_DATA *ecdh;
100
101    ecdh = ecdh_check(eckey);
102
103    if (ecdh == NULL)
104        return 0;
105
106#ifndef OPENSSL_NO_ENGINE
107    if (ecdh->engine) {
108        ENGINE_finish(ecdh->engine);
109        ecdh->engine = NULL;
110    }
111#endif
112    ecdh->meth = meth;
113#if 0
114    if (meth->init)
115        meth->init(eckey);
116#endif
117    return 1;
118}
119
120static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
121{
122    ECDH_DATA *ret;
123
124    ret = (ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
125    if (ret == NULL) {
126        ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, 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) {
140            ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
141            ENGINE_finish(ret->engine);
142            OPENSSL_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#if 0
151    if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
152        CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
153        OPENSSL_free(ret);
154        ret = NULL;
155    }
156#endif
157    return (ret);
158}
159
160static void *ecdh_data_new(void)
161{
162    return (void *)ECDH_DATA_new_method(NULL);
163}
164
165static void *ecdh_data_dup(void *data)
166{
167    ECDH_DATA *r = (ECDH_DATA *)data;
168
169    /* XXX: dummy operation */
170    if (r == NULL)
171        return NULL;
172
173    return (void *)ecdh_data_new();
174}
175
176void ecdh_data_free(void *data)
177{
178    ECDH_DATA *r = (ECDH_DATA *)data;
179
180#ifndef OPENSSL_NO_ENGINE
181    if (r->engine)
182        ENGINE_finish(r->engine);
183#endif
184
185    CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
186
187    OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
188
189    OPENSSL_free(r);
190}
191
192ECDH_DATA *ecdh_check(EC_KEY *key)
193{
194    ECDH_DATA *ecdh_data;
195
196    void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
197                                            ecdh_data_free, ecdh_data_free);
198    if (data == NULL) {
199        ecdh_data = (ECDH_DATA *)ecdh_data_new();
200        if (ecdh_data == NULL)
201            return NULL;
202        data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
203                                             ecdh_data_dup, ecdh_data_free,
204                                             ecdh_data_free);
205        if (data != NULL) {
206            /*
207             * Another thread raced us to install the key_method data and
208             * won.
209             */
210            ecdh_data_free(ecdh_data);
211            ecdh_data = (ECDH_DATA *)data;
212        }
213    } else
214        ecdh_data = (ECDH_DATA *)data;
215
216    return ecdh_data;
217}
218
219int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
220                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
221{
222    return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
223                                   new_func, dup_func, free_func);
224}
225
226int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
227{
228    ECDH_DATA *ecdh;
229    ecdh = ecdh_check(d);
230    if (ecdh == NULL)
231        return 0;
232    return (CRYPTO_set_ex_data(&ecdh->ex_data, idx, arg));
233}
234
235void *ECDH_get_ex_data(EC_KEY *d, int idx)
236{
237    ECDH_DATA *ecdh;
238    ecdh = ecdh_check(d);
239    if (ecdh == NULL)
240        return NULL;
241    return (CRYPTO_get_ex_data(&ecdh->ex_data, idx));
242}
243