1 /* ====================================================================
2 * Copyright (c) 2000 The OpenSSL Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in
13 * the documentation and/or other materials provided with the
14 * distribution.
15 *
16 * 3. All advertising materials mentioning features or use of this
17 * software must display the following acknowledgment:
18 * "This product includes software developed by the OpenSSL Project
19 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
20 *
21 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
22 * endorse or promote products derived from this software without
23 * prior written permission. For written permission, please contact
24 * licensing@OpenSSL.org.
25 *
26 * 5. Products derived from this software may not be called "OpenSSL"
27 * nor may "OpenSSL" appear in their names without prior written
28 * permission of the OpenSSL Project.
29 *
30 * 6. Redistributions of any form whatsoever must retain the following
31 * acknowledgment:
32 * "This product includes software developed by the OpenSSL Project
33 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
34 *
35 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
36 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
41 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
42 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
44 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
45 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
46 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This product includes cryptographic software written by Eric Young
50 * (eay@cryptsoft.com). This product includes software written by Tim
51 * Hudson (tjh@cryptsoft.com).
52 *
53 */
54
55 #include "eng_int.h"
56
57 /* If this symbol is defined then ENGINE_get_default_DH(), the function that is
58 * used by DH to hook in implementation code and cache defaults (etc), will
59 * display brief debugging summaries to stderr with the 'nid'. */
60 /* #define ENGINE_DH_DEBUG */
61
62 static ENGINE_TABLE *dh_table = NULL;
63 static const int dummy_nid = 1;
64
65 void ENGINE_unregister_DH(ENGINE *e)
66 {
67 engine_table_unregister(&dh_table, e);
68 }
69
70 static void engine_unregister_all_DH(void)
71 {
72 engine_table_cleanup(&dh_table);
73 }
74
75 int ENGINE_register_DH(ENGINE *e)
76 {
77 if(e->dh_meth)
78 return engine_table_register(&dh_table,
79 engine_unregister_all_DH, e, &dummy_nid, 1, 0);
80 return 1;
81 }
82
83 void ENGINE_register_all_DH()
84 {
85 ENGINE *e;
86
87 for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
88 ENGINE_register_DH(e);
89 }
90
91 int ENGINE_set_default_DH(ENGINE *e)
92 {
93 if(e->dh_meth)
94 return engine_table_register(&dh_table,
95 engine_unregister_all_DH, e, &dummy_nid, 1, 1);
96 return 1;
97 }
98
99 /* Exposed API function to get a functional reference from the implementation
100 * table (ie. try to get a functional reference from the tabled structural
101 * references). */
102 ENGINE *ENGINE_get_default_DH(void)
103 {
104 return engine_table_select(&dh_table, dummy_nid);
105 }
106
107 /* Obtains an DH implementation from an ENGINE functional reference */
108 const DH_METHOD *ENGINE_get_DH(const ENGINE *e)
109 {
110 return e->dh_meth;
111 }
112
113 /* Sets an DH implementation in an ENGINE structure */
114 int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
115 {
116 e->dh_meth = dh_meth;
117 return 1;
118 }