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_digest_engine(), the function that
58  * is used by EVP to hook in digest code and cache defaults (etc), will display
59  * brief debugging summaries to stderr with the 'nid'. */
60 /* #define ENGINE_DIGEST_DEBUG */
61 
62 static ENGINE_TABLE *digest_table = NULL;
63 
64 void ENGINE_unregister_digests(ENGINE *e)
65 	{
66 	engine_table_unregister(&digest_table, e);
67 	}
68 
69 static void engine_unregister_all_digests(void)
70 	{
71 	engine_table_cleanup(&digest_table);
72 	}
73 
74 int ENGINE_register_digests(ENGINE *e)
75 	{
76 	if(e->digests)
77 		{
78 		const int *nids;
79 		int num_nids = e->digests(e, NULL, &nids, 0);
80 		if(num_nids > 0)
81 			return engine_table_register(&digest_table,
82 					engine_unregister_all_digests, e, nids,
83 					num_nids, 0);
84 		}
85 	return 1;
86 	}
87 
88 void ENGINE_register_all_digests()
89 	{
90 	ENGINE *e;
91 
92 	for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e))
93 		ENGINE_register_digests(e);
94 	}
95 
96 int ENGINE_set_default_digests(ENGINE *e)
97 	{
98 	if(e->digests)
99 		{
100 		const int *nids;
101 		int num_nids = e->digests(e, NULL, &nids, 0);
102 		if(num_nids > 0)
103 			return engine_table_register(&digest_table,
104 					engine_unregister_all_digests, e, nids,
105 					num_nids, 1);
106 		}
107 	return 1;
108 	}
109 
110 /* Exposed API function to get a functional reference from the implementation
111  * table (ie. try to get a functional reference from the tabled structural
112  * references) for a given digest 'nid' */
113 ENGINE *ENGINE_get_digest_engine(int nid)
114 	{
115 	return engine_table_select(&digest_table, nid);
116 	}
117 
118 /* Obtains a digest implementation from an ENGINE functional reference */
119 const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid)
120 	{
121 	const EVP_MD *ret;
122 	ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);
123 	if(!fn || !fn(e, &ret, NULL, nid))
124 		{
125 		ENGINEerr(ENGINE_F_ENGINE_GET_DIGEST,
126 				ENGINE_R_UNIMPLEMENTED_DIGEST);
127 		return NULL;
128 		}
129 	return ret;
130 	}
131 
132 /* Gets the digest callback from an ENGINE structure */
133 ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e)
134 	{
135 	return e->digests;
136 	}
137 
138 /* Sets the digest callback in an ENGINE structure */
139 int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)
140 	{
141 	e->digests = f;
142 	return 1;
143 	}
144