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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_digest_engine(), the function that | |
60 | * is used by EVP to hook in digest code and cache defaults (etc), will display | |
61 | * brief debugging summaries to stderr with the 'nid'. */ | |
62 | /* #define ENGINE_DIGEST_DEBUG */ | |
63 | ||
64 | static ENGINE_TABLE *digest_table = NULL; | |
65 | ||
66 | void ENGINE_unregister_digests(ENGINE *e) | |
67 | { | |
68 | engine_table_unregister(&digest_table, e); | |
69 | } | |
70 | ||
71 | static void engine_unregister_all_digests() | |
72 | { | |
73 | engine_table_cleanup(&digest_table); | |
74 | } | |
75 | ||
76 | int ENGINE_register_digests(ENGINE *e) | |
77 | { | |
78 | if(e->digests) | |
79 | { | |
80 | const int *nids; | |
81 | int num_nids = e->digests(e, NULL, &nids, 0); | |
82 | if(num_nids > 0) | |
83 | return engine_table_register(&digest_table, | |
84 | &engine_unregister_all_digests, e, nids, | |
85 | num_nids, 0); | |
86 | } | |
87 | return 1; | |
88 | } | |
89 | ||
90 | void ENGINE_register_all_digests() | |
91 | { | |
92 | ENGINE *e; | |
93 | ||
94 | for(e=ENGINE_get_first() ; e ; e=ENGINE_get_next(e)) | |
95 | ENGINE_register_digests(e); | |
96 | } | |
97 | ||
98 | int ENGINE_set_default_digests(ENGINE *e) | |
99 | { | |
100 | if(e->digests) | |
101 | { | |
102 | const int *nids; | |
103 | int num_nids = e->digests(e, NULL, &nids, 0); | |
104 | if(num_nids > 0) | |
105 | return engine_table_register(&digest_table, | |
106 | &engine_unregister_all_digests, e, nids, | |
107 | num_nids, 1); | |
108 | } | |
109 | return 1; | |
110 | } | |
111 | ||
112 | /* Exposed API function to get a functional reference from the implementation | |
113 | * table (ie. try to get a functional reference from the tabled structural | |
114 | * references) for a given digest 'nid' */ | |
115 | ENGINE *ENGINE_get_digest_engine(int nid) | |
116 | { | |
117 | return engine_table_select(&digest_table, nid); | |
118 | } | |
119 | ||
120 | /* Obtains a digest implementation from an ENGINE functional reference */ | |
121 | const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid) | |
122 | { | |
123 | const EVP_MD *ret; | |
124 | ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e); | |
125 | if(!fn || !fn(e, &ret, NULL, nid)) | |
126 | { | |
127 | ENGINEerr(ENGINE_F_ENGINE_GET_DIGEST, | |
128 | ENGINE_R_UNIMPLEMENTED_DIGEST); | |
129 | return NULL; | |
130 | } | |
131 | return ret; | |
132 | } | |
133 | ||
134 | /* Gets the digest callback from an ENGINE structure */ | |
135 | ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e) | |
136 | { | |
137 | return e->digests; | |
138 | } | |
139 | ||
140 | /* Sets the digest callback in an ENGINE structure */ | |
141 | int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f) | |
142 | { | |
143 | e->digests = f; | |
144 | return 1; | |
145 | } |