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 /* 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 {
82 engine_table_unregister(&ecdh_table, e);
83 }
84
85 static void engine_unregister_all_ECDH(void)
86 {
87 engine_table_cleanup(&ecdh_table);
88 }
89
90 int ENGINE_register_ECDH(ENGINE *e)
91 {
92 if(e->ecdh_meth)
93 return engine_table_register(&ecdh_table,
94 engine_unregister_all_ECDH, e, &dummy_nid, 1, 0);
95 return 1;
96 }
97
98 void ENGINE_register_all_ECDH()
99 {
100 ENGINE *e;
101
102 for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
103 ENGINE_register_ECDH(e);
104 }
105
106 int ENGINE_set_default_ECDH(ENGINE *e)
107 {
108 if(e->ecdh_meth)
109 return engine_table_register(&ecdh_table,
110 engine_unregister_all_ECDH, e, &dummy_nid, 1, 1);
111 return 1;
112 }
113
114 /* Exposed API function to get a functional reference from the implementation
115 * table (ie. try to get a functional reference from the tabled structural
116 * references). */
117 ENGINE *ENGINE_get_default_ECDH(void)
118 {
119 return engine_table_select(&ecdh_table, dummy_nid);
120 }
121
122 /* Obtains an ECDH implementation from an ENGINE functional reference */
123 const ECDH_METHOD *ENGINE_get_ECDH(const ENGINE *e)
124 {
125 return e->ecdh_meth;
126 }
127
128 /* Sets an ECDH implementation in an ENGINE structure */
129 int ENGINE_set_ECDH(ENGINE *e, const ECDH_METHOD *ecdh_meth)
130 {
131 e->ecdh_meth = ecdh_meth;
132 return 1;
133 }