1OPENSSL_CONFIG(3)                   OpenSSL                  OPENSSL_CONFIG(3)
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NAME

6       OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration
7       functions
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SYNOPSIS

10        #include <openssl/conf.h>
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12        #if OPENSSL_API_COMPAT < 0x10100000L
13        void OPENSSL_config(const char *appname);
14        void OPENSSL_no_config(void);
15        #endif
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DESCRIPTION

18       OPENSSL_config() configures OpenSSL using the standard openssl.cnf and
19       reads from the application section appname. If appname is NULL then the
20       default section, openssl_conf, will be used.  Errors are silently
21       ignored.  Multiple calls have no effect.
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23       OPENSSL_no_config() disables configuration. If called before
24       OPENSSL_config() no configuration takes place.
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26       If the application is built with OPENSSL_LOAD_CONF defined, then a call
27       to OpenSSL_add_all_algorithms() will implicitly call OPENSSL_config()
28       first.
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NOTES

31       The OPENSSL_config() function is designed to be a very simple "call it
32       and forget it" function.  It is however much better than nothing.
33       Applications which need finer control over their configuration
34       functionality should use the configuration functions such as
35       CONF_modules_load() directly. This function is deprecated and its use
36       should be avoided.  Applications should instead call
37       CONF_modules_load() during initialization (that is before starting any
38       threads).
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40       There are several reasons why calling the OpenSSL configuration
41       routines is advisable. For example, to load dynamic ENGINEs from shared
42       libraries (DSOs).  However, very few applications currently support the
43       control interface and so very few can load and use dynamic ENGINEs.
44       Equally in future more sophisticated ENGINEs will require certain
45       control operations to customize them. If an application calls
46       OPENSSL_config() it doesn't need to know or care about ENGINE control
47       operations because they can be performed by editing a configuration
48       file.
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ENVIRONMENT

51       OPENSSL_CONF
52           The path to the config file.  Ignored in set-user-ID and set-group-
53           ID programs.
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RETURN VALUES

56       Neither OPENSSL_config() nor OPENSSL_no_config() return a value.
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SEE ALSO

59       config(5), CONF_modules_load_file(3)
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HISTORY

62       The OPENSSL_no_config() and OPENSSL_config() functions were deprecated
63       in OpenSSL 1.1.0 by OPENSSL_init_crypto().
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66       Copyright 2004-2020 The OpenSSL Project Authors. All Rights Reserved.
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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       <https://www.openssl.org/source/license.html>.
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751.1.1q                            2023-07-20                 OPENSSL_CONFIG(3)
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