1 /* $OpenBSD: tb_ecdh.c,v 1.4 2014/06/12 15:49:29 deraadt Exp $ */
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 /* If this symbol is defined then ENGINE_get_default_ECDH(), the function that is
73 * used by ECDH to hook in implementation code and cache defaults (etc), will
74 * display brief debugging summaries to stderr with the 'nid'. */
75 /* #define ENGINE_ECDH_DEBUG */
76
77 static ENGINE_TABLE *ecdh_table = NULL;
78 static const int dummy_nid = 1;
79
80 void
ENGINE_unregister_ECDH(ENGINE * e)81 ENGINE_unregister_ECDH(ENGINE *e)
82 {
83 engine_table_unregister(&ecdh_table, e);
84 }
85
86 static void
engine_unregister_all_ECDH(void)87 engine_unregister_all_ECDH(void)
88 {
89 engine_table_cleanup(&ecdh_table);
90 }
91
92 int
ENGINE_register_ECDH(ENGINE * e)93 ENGINE_register_ECDH(ENGINE *e)
94 {
95 if (e->ecdh_meth)
96 return engine_table_register(&ecdh_table,
97 engine_unregister_all_ECDH, e, &dummy_nid, 1, 0);
98 return 1;
99 }
100
101 void
ENGINE_register_all_ECDH(void)102 ENGINE_register_all_ECDH(void)
103 {
104 ENGINE *e;
105
106 for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
107 ENGINE_register_ECDH(e);
108 }
109
110 int
ENGINE_set_default_ECDH(ENGINE * e)111 ENGINE_set_default_ECDH(ENGINE *e)
112 {
113 if (e->ecdh_meth)
114 return engine_table_register(&ecdh_table,
115 engine_unregister_all_ECDH, e, &dummy_nid, 1, 1);
116 return 1;
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 ENGINE *
ENGINE_get_default_ECDH(void)123 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 */
129 const ECDH_METHOD *
ENGINE_get_ECDH(const ENGINE * e)130 ENGINE_get_ECDH(const ENGINE *e)
131 {
132 return e->ecdh_meth;
133 }
134
135 /* Sets an ECDH implementation in an ENGINE structure */
136 int
ENGINE_set_ECDH(ENGINE * e,const ECDH_METHOD * ecdh_meth)137 ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth)
138 {
139 e->ecdh_meth = ecdh_meth;
140 return 1;
141 }
142