1/*
2 * Copyright 2001-2021 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/* We need to use some engine deprecated APIs */
11#define OPENSSL_SUPPRESS_DEPRECATED
12
13#include "eng_local.h"
14
15static ENGINE_TABLE *dh_table = NULL;
16static const int dummy_nid = 1;
17
18void ENGINE_unregister_DH(ENGINE *e)
19{
20    engine_table_unregister(&dh_table, e);
21}
22
23static void engine_unregister_all_DH(void)
24{
25    engine_table_cleanup(&dh_table);
26}
27
28int ENGINE_register_DH(ENGINE *e)
29{
30    if (e->dh_meth)
31        return engine_table_register(&dh_table,
32                                     engine_unregister_all_DH, e, &dummy_nid,
33                                     1, 0);
34    return 1;
35}
36
37void ENGINE_register_all_DH(void)
38{
39    ENGINE *e;
40
41    for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
42        ENGINE_register_DH(e);
43}
44
45int ENGINE_set_default_DH(ENGINE *e)
46{
47    if (e->dh_meth)
48        return engine_table_register(&dh_table,
49                                     engine_unregister_all_DH, e, &dummy_nid,
50                                     1, 1);
51    return 1;
52}
53
54/*
55 * Exposed API function to get a functional reference from the implementation
56 * table (ie. try to get a functional reference from the tabled structural
57 * references).
58 */
59ENGINE *ENGINE_get_default_DH(void)
60{
61    return ossl_engine_table_select(&dh_table, dummy_nid,
62                                    OPENSSL_FILE, OPENSSL_LINE);
63}
64
65/* Obtains an DH implementation from an ENGINE functional reference */
66const DH_METHOD *ENGINE_get_DH(const ENGINE *e)
67{
68    return e->dh_meth;
69}
70
71/* Sets an DH implementation in an ENGINE structure */
72int ENGINE_set_DH(ENGINE *e, const DH_METHOD *dh_meth)
73{
74    e->dh_meth = dh_meth;
75    return 1;
76}
77