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		{
109		ENGINE_finish(ecdh->engine);
110		ecdh->engine = NULL;
111		}
112#endif
113        ecdh->meth = meth;
114#if 0
115        if (meth->init)
116		meth->init(eckey);
117#endif
118        return 1;
119	}
120
121static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
122	{
123	ECDH_DATA *ret;
124
125	ret=(ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
126	if (ret == NULL)
127		{
128		ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
129		return(NULL);
130		}
131
132	ret->init = NULL;
133
134	ret->meth = ECDH_get_default_method();
135	ret->engine = engine;
136#ifndef OPENSSL_NO_ENGINE
137	if (!ret->engine)
138		ret->engine = ENGINE_get_default_ECDH();
139	if (ret->engine)
140		{
141		ret->meth = ENGINE_get_ECDH(ret->engine);
142		if (!ret->meth)
143			{
144			ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
145			ENGINE_finish(ret->engine);
146			OPENSSL_free(ret);
147			return NULL;
148			}
149		}
150#endif
151
152	ret->flags = ret->meth->flags;
153	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
154#if 0
155	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
156		{
157		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
158		OPENSSL_free(ret);
159		ret=NULL;
160		}
161#endif
162	return(ret);
163	}
164
165static void *ecdh_data_new(void)
166	{
167	return (void *)ECDH_DATA_new_method(NULL);
168	}
169
170static void *ecdh_data_dup(void *data)
171{
172	ECDH_DATA *r = (ECDH_DATA *)data;
173
174	/* XXX: dummy operation */
175	if (r == NULL)
176		return NULL;
177
178	return (void *)ecdh_data_new();
179}
180
181void ecdh_data_free(void *data)
182	{
183	ECDH_DATA *r = (ECDH_DATA *)data;
184
185#ifndef OPENSSL_NO_ENGINE
186	if (r->engine)
187		ENGINE_finish(r->engine);
188#endif
189
190	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
191
192	OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
193
194	OPENSSL_free(r);
195	}
196
197ECDH_DATA *ecdh_check(EC_KEY *key)
198	{
199	ECDH_DATA *ecdh_data;
200
201	void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
202					ecdh_data_free, ecdh_data_free);
203	if (data == NULL)
204	{
205		ecdh_data = (ECDH_DATA *)ecdh_data_new();
206		if (ecdh_data == NULL)
207			return NULL;
208		data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
209			   ecdh_data_dup, ecdh_data_free, ecdh_data_free);
210		if (data != NULL)
211			{
212			/* Another thread raced us to install the key_method
213			 * data and won. */
214			ecdh_data_free(ecdh_data);
215			ecdh_data = (ECDH_DATA *)data;
216			}
217	}
218	else
219		ecdh_data = (ECDH_DATA *)data;
220
221
222	return ecdh_data;
223	}
224
225int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
226	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
227	{
228	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
229				new_func, dup_func, free_func);
230	}
231
232int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
233	{
234	ECDH_DATA *ecdh;
235	ecdh = ecdh_check(d);
236	if (ecdh == NULL)
237		return 0;
238	return(CRYPTO_set_ex_data(&ecdh->ex_data,idx,arg));
239	}
240
241void *ECDH_get_ex_data(EC_KEY *d, int idx)
242	{
243	ECDH_DATA *ecdh;
244	ecdh = ecdh_check(d);
245	if (ecdh == NULL)
246		return NULL;
247	return(CRYPTO_get_ex_data(&ecdh->ex_data,idx));
248	}
249