1 /* $OpenBSD: tb_digest.c,v 1.8 2017/01/29 17:49:23 beck Exp $ */
2 /* ====================================================================
3  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in
14  *    the documentation and/or other materials provided with the
15  *    distribution.
16  *
17  * 3. All advertising materials mentioning features or use of this
18  *    software must display the following acknowledgment:
19  *    "This product includes software developed by the OpenSSL Project
20  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
21  *
22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23  *    endorse or promote products derived from this software without
24  *    prior written permission. For written permission, please contact
25  *    licensing@OpenSSL.org.
26  *
27  * 5. Products derived from this software may not be called "OpenSSL"
28  *    nor may "OpenSSL" appear in their names without prior written
29  *    permission of the OpenSSL Project.
30  *
31  * 6. Redistributions of any form whatsoever must retain the following
32  *    acknowledgment:
33  *    "This product includes software developed by the OpenSSL Project
34  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
35  *
36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47  * OF THE POSSIBILITY OF SUCH DAMAGE.
48  * ====================================================================
49  *
50  * This product includes cryptographic software written by Eric Young
51  * (eay@cryptsoft.com).  This product includes software written by Tim
52  * Hudson (tjh@cryptsoft.com).
53  *
54  */
55 
56 #include <openssl/err.h>
57 
58 #include "eng_int.h"
59 
60 /* If this symbol is defined then ENGINE_get_digest_engine(), the function that
61  * is used by EVP to hook in digest code and cache defaults (etc), will display
62  * brief debugging summaries to stderr with the 'nid'. */
63 /* #define ENGINE_DIGEST_DEBUG */
64 
65 static ENGINE_TABLE *digest_table = NULL;
66 
67 void
68 ENGINE_unregister_digests(ENGINE *e)
69 {
70 	engine_table_unregister(&digest_table, e);
71 }
72 
73 static void
74 engine_unregister_all_digests(void)
75 {
76 	engine_table_cleanup(&digest_table);
77 }
78 
79 int
80 ENGINE_register_digests(ENGINE *e)
81 {
82 	if (e->digests) {
83 		const int *nids;
84 		int num_nids = e->digests(e, NULL, &nids, 0);
85 		if (num_nids > 0)
86 			return engine_table_register(&digest_table,
87 			    engine_unregister_all_digests, e, nids,
88 			    num_nids, 0);
89 	}
90 	return 1;
91 }
92 
93 void
94 ENGINE_register_all_digests(void)
95 {
96 	ENGINE *e;
97 
98 	for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
99 		ENGINE_register_digests(e);
100 }
101 
102 int
103 ENGINE_set_default_digests(ENGINE *e)
104 {
105 	if (e->digests) {
106 		const int *nids;
107 		int num_nids = e->digests(e, NULL, &nids, 0);
108 		if (num_nids > 0)
109 			return engine_table_register(&digest_table,
110 			    engine_unregister_all_digests, e, nids,
111 			    num_nids, 1);
112 	}
113 	return 1;
114 }
115 
116 /* Exposed API function to get a functional reference from the implementation
117  * table (ie. try to get a functional reference from the tabled structural
118  * references) for a given digest 'nid' */
119 ENGINE *
120 ENGINE_get_digest_engine(int nid)
121 {
122 	return engine_table_select(&digest_table, nid);
123 }
124 
125 /* Obtains a digest implementation from an ENGINE functional reference */
126 const EVP_MD *
127 ENGINE_get_digest(ENGINE *e, int nid)
128 {
129 	const EVP_MD *ret;
130 	ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);
131 
132 	if (!fn || !fn(e, &ret, NULL, nid)) {
133 		ENGINEerror(ENGINE_R_UNIMPLEMENTED_DIGEST);
134 		return NULL;
135 	}
136 	return ret;
137 }
138 
139 /* Gets the digest callback from an ENGINE structure */
140 ENGINE_DIGESTS_PTR
141 ENGINE_get_digests(const ENGINE *e)
142 {
143 	return e->digests;
144 }
145 
146 /* Sets the digest callback in an ENGINE structure */
147 int
148 ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)
149 {
150 	e->digests = f;
151 	return 1;
152 }
153