5 OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions
9 #include <openssl/conf.h>
11 void OPENSSL_config(const char *config_name);
12 void OPENSSL_no_config(void);
16 OPENSSL_config() configures OpenSSL using the standard B<openssl.cnf>
17 configuration file name using B<config_name>. If B<config_name> is NULL then
18 the file specified in the environment variable B<OPENSSL_CONF> will be used,
19 and if that is not set then a system default location is used.
20 Errors are silently ignored.
21 Multiple calls have no effect.
23 OPENSSL_no_config() disables configuration. If called before OPENSSL_config()
24 no configuration takes place.
26 If the application is built with B<OPENSSL_LOAD_CONF> defined, then a
27 call to OpenSSL_add_all_algorithms() will implicitly call OPENSSL_config()
32 The OPENSSL_config() function is designed to be a very simple "call it and
34 It is however B<much> better than nothing. Applications which need finer
35 control over their configuration functionality should use the configuration
36 functions such as CONF_modules_load() directly. This function is deprecated
37 and its use should be avoided.
38 Applications should instead call CONF_modules_load() during
39 initialization (that is before starting any threads).
41 There are several reasons why calling the OpenSSL configuration routines is
42 advisable. For example, to load dynamic ENGINEs from shared libraries (DSOs).
43 However very few applications currently support the control interface and so
44 very few can load and use dynamic ENGINEs. Equally in future more sophisticated
45 ENGINEs will require certain control operations to customize them. If an
46 application calls OPENSSL_config() it doesn't need to know or care about
47 ENGINE control operations because they can be performed by editing a
52 Neither OPENSSL_config() nor OPENSSL_no_config() return a value.
57 L<CONF_modules_load_file(3)>
61 The OPENSSL_no_config() and OPENSSL_config() functions were
62 deprecated in OpenSSL 1.1.0 by OPENSSL_init_crypto().
66 Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
68 Licensed under the OpenSSL license (the "License"). You may not use
69 this file except in compliance with the License. You can obtain a copy
70 in the file LICENSE in the source distribution or at
71 L<https://www.openssl.org/source/license.html>.