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		{
97#ifdef OPENSSL_FIPS
98		if (FIPS_mode())
99			return FIPS_ecdh_openssl();
100		else
101			return ECDH_OpenSSL();
102#else
103		default_ECDH_method = ECDH_OpenSSL();
104#endif
105		}
106	return default_ECDH_method;
107	}
108
109int ECDH_set_method(EC_KEY *eckey, const ECDH_METHOD *meth)
110	{
111	ECDH_DATA *ecdh;
112
113	ecdh = ecdh_check(eckey);
114
115	if (ecdh == NULL)
116		return 0;
117
118#if 0
119        mtmp = ecdh->meth;
120        if (mtmp->finish)
121		mtmp->finish(eckey);
122#endif
123#ifndef OPENSSL_NO_ENGINE
124	if (ecdh->engine)
125		{
126		ENGINE_finish(ecdh->engine);
127		ecdh->engine = NULL;
128		}
129#endif
130        ecdh->meth = meth;
131#if 0
132        if (meth->init)
133		meth->init(eckey);
134#endif
135        return 1;
136	}
137
138static ECDH_DATA *ECDH_DATA_new_method(ENGINE *engine)
139	{
140	ECDH_DATA *ret;
141
142	ret=(ECDH_DATA *)OPENSSL_malloc(sizeof(ECDH_DATA));
143	if (ret == NULL)
144		{
145		ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
146		return(NULL);
147		}
148
149	ret->init = NULL;
150
151	ret->meth = ECDH_get_default_method();
152	ret->engine = engine;
153#ifndef OPENSSL_NO_ENGINE
154	if (!ret->engine)
155		ret->engine = ENGINE_get_default_ECDH();
156	if (ret->engine)
157		{
158		ret->meth = ENGINE_get_ECDH(ret->engine);
159		if (!ret->meth)
160			{
161			ECDHerr(ECDH_F_ECDH_DATA_NEW_METHOD, ERR_R_ENGINE_LIB);
162			ENGINE_finish(ret->engine);
163			OPENSSL_free(ret);
164			return NULL;
165			}
166		}
167#endif
168
169	ret->flags = ret->meth->flags;
170	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
171#if 0
172	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
173		{
174		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, ret, &ret->ex_data);
175		OPENSSL_free(ret);
176		ret=NULL;
177		}
178#endif
179	return(ret);
180	}
181
182static void *ecdh_data_new(void)
183	{
184	return (void *)ECDH_DATA_new_method(NULL);
185	}
186
187static void *ecdh_data_dup(void *data)
188{
189	ECDH_DATA *r = (ECDH_DATA *)data;
190
191	/* XXX: dummy operation */
192	if (r == NULL)
193		return NULL;
194
195	return (void *)ecdh_data_new();
196}
197
198void ecdh_data_free(void *data)
199	{
200	ECDH_DATA *r = (ECDH_DATA *)data;
201
202#ifndef OPENSSL_NO_ENGINE
203	if (r->engine)
204		ENGINE_finish(r->engine);
205#endif
206
207	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDH, r, &r->ex_data);
208
209	OPENSSL_cleanse((void *)r, sizeof(ECDH_DATA));
210
211	OPENSSL_free(r);
212	}
213
214ECDH_DATA *ecdh_check(EC_KEY *key)
215	{
216	ECDH_DATA *ecdh_data;
217
218	void *data = EC_KEY_get_key_method_data(key, ecdh_data_dup,
219					ecdh_data_free, ecdh_data_free);
220	if (data == NULL)
221	{
222		ecdh_data = (ECDH_DATA *)ecdh_data_new();
223		if (ecdh_data == NULL)
224			return NULL;
225		data = EC_KEY_insert_key_method_data(key, (void *)ecdh_data,
226			   ecdh_data_dup, ecdh_data_free, ecdh_data_free);
227		if (data != NULL)
228			{
229			/* Another thread raced us to install the key_method
230			 * data and won. */
231			ecdh_data_free(ecdh_data);
232			ecdh_data = (ECDH_DATA *)data;
233			}
234	}
235	else
236		ecdh_data = (ECDH_DATA *)data;
237#ifdef OPENSSL_FIPS
238	if (FIPS_mode() && !(ecdh_data->flags & ECDH_FLAG_FIPS_METHOD)
239			&& !(EC_KEY_get_flags(key) & EC_FLAG_NON_FIPS_ALLOW))
240		{
241		ECDHerr(ECDH_F_ECDH_CHECK, ECDH_R_NON_FIPS_METHOD);
242		return NULL;
243		}
244#endif
245
246
247	return ecdh_data;
248	}
249
250int ECDH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
251	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
252	{
253	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_ECDH, argl, argp,
254				new_func, dup_func, free_func);
255	}
256
257int ECDH_set_ex_data(EC_KEY *d, int idx, void *arg)
258	{
259	ECDH_DATA *ecdh;
260	ecdh = ecdh_check(d);
261	if (ecdh == NULL)
262		return 0;
263	return(CRYPTO_set_ex_data(&ecdh->ex_data,idx,arg));
264	}
265
266void *ECDH_get_ex_data(EC_KEY *d, int idx)
267	{
268	ECDH_DATA *ecdh;
269	ecdh = ecdh_check(d);
270	if (ecdh == NULL)
271		return NULL;
272	return(CRYPTO_get_ex_data(&ecdh->ex_data,idx));
273	}
274