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 *digest_table = NULL;
16
17void ENGINE_unregister_digests(ENGINE *e)
18{
19    engine_table_unregister(&digest_table, e);
20}
21
22static void engine_unregister_all_digests(void)
23{
24    engine_table_cleanup(&digest_table);
25}
26
27int ENGINE_register_digests(ENGINE *e)
28{
29    if (e->digests) {
30        const int *nids;
31        int num_nids = e->digests(e, NULL, &nids, 0);
32        if (num_nids > 0)
33            return engine_table_register(&digest_table,
34                                         engine_unregister_all_digests, e,
35                                         nids, num_nids, 0);
36    }
37    return 1;
38}
39
40void ENGINE_register_all_digests(void)
41{
42    ENGINE *e;
43
44    for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
45        ENGINE_register_digests(e);
46}
47
48int ENGINE_set_default_digests(ENGINE *e)
49{
50    if (e->digests) {
51        const int *nids;
52        int num_nids = e->digests(e, NULL, &nids, 0);
53        if (num_nids > 0)
54            return engine_table_register(&digest_table,
55                                         engine_unregister_all_digests, e,
56                                         nids, num_nids, 1);
57    }
58    return 1;
59}
60
61/*
62 * Exposed API function to get a functional reference from the implementation
63 * table (ie. try to get a functional reference from the tabled structural
64 * references) for a given digest 'nid'
65 */
66ENGINE *ENGINE_get_digest_engine(int nid)
67{
68    return ossl_engine_table_select(&digest_table, nid,
69                                    OPENSSL_FILE, OPENSSL_LINE);
70}
71
72/* Obtains a digest implementation from an ENGINE functional reference */
73const EVP_MD *ENGINE_get_digest(ENGINE *e, int nid)
74{
75    const EVP_MD *ret;
76    ENGINE_DIGESTS_PTR fn = ENGINE_get_digests(e);
77    if (!fn || !fn(e, &ret, NULL, nid)) {
78        ERR_raise(ERR_LIB_ENGINE, ENGINE_R_UNIMPLEMENTED_DIGEST);
79        return NULL;
80    }
81    return ret;
82}
83
84/* Gets the digest callback from an ENGINE structure */
85ENGINE_DIGESTS_PTR ENGINE_get_digests(const ENGINE *e)
86{
87    return e->digests;
88}
89
90/* Sets the digest callback in an ENGINE structure */
91int ENGINE_set_digests(ENGINE *e, ENGINE_DIGESTS_PTR f)
92{
93    e->digests = f;
94    return 1;
95}
96