xref: /openssl/crypto/engine/tb_rand.c (revision 38fc02a7)
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 
15 static ENGINE_TABLE *rand_table = NULL;
16 static const int dummy_nid = 1;
17 
ENGINE_unregister_RAND(ENGINE * e)18 void ENGINE_unregister_RAND(ENGINE *e)
19 {
20     engine_table_unregister(&rand_table, e);
21 }
22 
engine_unregister_all_RAND(void)23 static void engine_unregister_all_RAND(void)
24 {
25     engine_table_cleanup(&rand_table);
26 }
27 
ENGINE_register_RAND(ENGINE * e)28 int ENGINE_register_RAND(ENGINE *e)
29 {
30     if (e->rand_meth)
31         return engine_table_register(&rand_table,
32                                      engine_unregister_all_RAND, e,
33                                      &dummy_nid, 1, 0);
34     return 1;
35 }
36 
ENGINE_register_all_RAND(void)37 void ENGINE_register_all_RAND(void)
38 {
39     ENGINE *e;
40 
41     for (e = ENGINE_get_first(); e; e = ENGINE_get_next(e))
42         ENGINE_register_RAND(e);
43 }
44 
ENGINE_set_default_RAND(ENGINE * e)45 int ENGINE_set_default_RAND(ENGINE *e)
46 {
47     if (e->rand_meth)
48         return engine_table_register(&rand_table,
49                                      engine_unregister_all_RAND, e,
50                                      &dummy_nid, 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  */
ENGINE_get_default_RAND(void)59 ENGINE *ENGINE_get_default_RAND(void)
60 {
61     return ossl_engine_table_select(&rand_table, dummy_nid,
62                                     OPENSSL_FILE, OPENSSL_LINE);
63 }
64 
65 /* Obtains an RAND implementation from an ENGINE functional reference */
ENGINE_get_RAND(const ENGINE * e)66 const RAND_METHOD *ENGINE_get_RAND(const ENGINE *e)
67 {
68     return e->rand_meth;
69 }
70 
71 /* Sets an RAND implementation in an ENGINE structure */
ENGINE_set_RAND(ENGINE * e,const RAND_METHOD * rand_meth)72 int ENGINE_set_RAND(ENGINE *e, const RAND_METHOD *rand_meth)
73 {
74     e->rand_meth = rand_meth;
75     return 1;
76 }
77