tb_ecdh.c revision 296465 
1/* crypto/engine/tb_ecdh.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 engine software is originally written by Nils Gura and
13 * Douglas Stebila of Sun Microsystems Laboratories.
14 *
15 */
16/* ====================================================================
17 * Copyright (c) 2000-2002 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 *    licensing@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 "eng_int.h"
71
72/*
73 * If this symbol is defined then ENGINE_get_default_ECDH(), the function
74 * that is used by ECDH to hook in implementation code and cache defaults
75 * (etc), will display brief debugging summaries to stderr with the 'nid'.
76 */
77/* #define ENGINE_ECDH_DEBUG */
78
79static ENGINE_TABLE *ecdh_table = NULL;
80static const int dummy_nid = 1;
81
82void ENGINE_unregister_ECDH(ENGINE *e)
83{
84    engine_table_unregister(&ecdh_table, e);
85}
86
87static void engine_unregister_all_ECDH(void)
88{
89    engine_table_cleanup(&ecdh_table);
90}
91
92int ENGINE_register_ECDH(ENGINE *e)
93{
94    if (e->ecdh_meth)
95        return engine_table_register(&ecdh_table,
96                                     engine_unregister_all_ECDH, e,
97                                     &dummy_nid, 1, 0);
98    return 1;
99}
100
101void ENGINE_register_all_ECDH()
102{
103    ENGINE *e;
104
105    for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
106        ENGINE_register_ECDH(e);
107}
108
109int ENGINE_set_default_ECDH(ENGINE *e)
110{
111    if (e->ecdh_meth)
112        return engine_table_register(&ecdh_table,
113                                     engine_unregister_all_ECDH, e,
114                                     &dummy_nid, 1, 1);
115    return 1;
116}
117
118/*
119 * Exposed API function to get a functional reference from the implementation
120 * table (ie. try to get a functional reference from the tabled structural
121 * references).
122 */
123ENGINE *ENGINE_get_default_ECDH(void)
124{
125    return engine_table_select(&ecdh_table, dummy_nid);
126}
127
128/* Obtains an ECDH implementation from an ENGINE functional reference */
129const ECDH_METHOD *ENGINE_get_ECDH(const ENGINE *e)
130{
131    return e->ecdh_meth;
132}
133
134/* Sets an ECDH implementation in an ENGINE structure */
135int ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth)
136{
137    e->ecdh_meth = ecdh_meth;
138    return 1;
139}
140