tb_dsa.c revision 109998 
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 <openssl/evp.h>
56#include <openssl/engine.h>
57#include "eng_int.h"
58
59/* If this symbol is defined then ENGINE_get_default_DSA(), the function that is
60 * used by DSA to hook in implementation code and cache defaults (etc), will
61 * display brief debugging summaries to stderr with the 'nid'. */
62/* #define ENGINE_DSA_DEBUG */
63
64static ENGINE_TABLE *dsa_table = NULL;
65static const int dummy_nid = 1;
66
67void ENGINE_unregister_DSA(ENGINE *e)
68	{
69	engine_table_unregister(&dsa_table, e);
70	}
71
72static void engine_unregister_all_DSA(void)
73	{
74	engine_table_cleanup(&dsa_table);
75	}
76
77int ENGINE_register_DSA(ENGINE *e)
78	{
79	if(e->dsa_meth)
80		return engine_table_register(&dsa_table,
81				engine_unregister_all_DSA, e, &dummy_nid, 1, 0);
82	return 1;
83	}
84
85void ENGINE_register_all_DSA()
86	{
87	ENGINE *e;
88
89	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
90		ENGINE_register_DSA(e);
91	}
92
93int ENGINE_set_default_DSA(ENGINE *e)
94	{
95	if(e->dsa_meth)
96		return engine_table_register(&dsa_table,
97				engine_unregister_all_DSA, e, &dummy_nid, 1, 0);
98	return 1;
99	}
100
101/* Exposed API function to get a functional reference from the implementation
102 * table (ie. try to get a functional reference from the tabled structural
103 * references). */
104ENGINE *ENGINE_get_default_DSA(void)
105	{
106	return engine_table_select(&dsa_table, dummy_nid);
107	}
108
109/* Obtains an DSA implementation from an ENGINE functional reference */
110const DSA_METHOD *ENGINE_get_DSA(const ENGINE *e)
111	{
112	return e->dsa_meth;
113	}
114
115/* Sets an DSA implementation in an ENGINE structure */
116int ENGINE_set_DSA(ENGINE *e, const DSA_METHOD *dsa_meth)
117	{
118	e->dsa_meth = dsa_meth;
119	return 1;
120	}
121