1/*
2 * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include "eng_local.h"
11
12static ENGINE_TABLE *digest_table = NULL;
13
14void ENGINE_unregister_digests(ENGINE *e)
15{
16 engine_table_unregister(&digest_table, e);
17}
18
19static void engine_unregister_all_digests(void)
20{
21 engine_table_cleanup(&digest_table);
22}
23
24int ENGINE_register_digests(ENGINE *e)
25{
26 if (e->digests) {
27 const int *nids;
28 int num_nids = e->digests(e, NULL, &nids, 0);
29 if (num_nids > 0)
30 return engine_table_register(&digest_table,
31 engine_unregister_all_digests, e,
32 nids, num_nids, 0);
33 }
34 return 1;
35}
36
37void ENGINE_register_all_digests(void)
38{
39 ENGINE *e;
40
41 for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
42 ENGINE_register_digests(e);
43}
44
45int ENGINE_set_default_digests(ENGINE *e)
46{
47 if (e->digests) {
48 const int *nids;
49 int num_nids = e->digests(e, NULL, &nids, 0);
50 if (num_nids > 0)
51 return engine_table_register(&digest_table,
52 engine_unregister_all_digests, e,
53 nids, num_nids, 1);
54 }
55 return 1;
56}
57
58/*
59 * Exposed API function to get a functional reference from the implementation
60 * table (ie. try to get a functional reference from the tabled structural
61 * references) for a given digest 'nid'
62 */
63ENGINE *ENGINE_get_digest_engine(int nid)
64{
65 return engine_table_select(&digest_table, nid);
66}
67
68/* Obtains a digest implementation from an ENGINE functional reference */
69const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid)
70{
71 const EVP_MD *ret;
72 ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);
73 if (!fn || !fn(e, &ret, NULL, nid)) {
74 ENGINEerr(ENGINE_F_ENGINE_GET_DIGEST, ENGINE_R_UNIMPLEMENTED_DIGEST);
75 return NULL;
76 }
77 return ret;
78}
79
80/* Gets the digest callback from an ENGINE structure */
81ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e)
82{
83 return e->digests;
84}
85
86/* Sets the digest callback in an ENGINE structure */
87int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)
88{
89 e->digests = f;
90 return 1;
91}
92