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Title "OPENSSL_config 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions Header "SYNOPSIS" .Vb 1 #include <openssl/conf.h> \& void OPENSSL_config(const char *appname); void OPENSSL_no_config(void); .Ve Header "DESCRIPTION" \fBOPENSSL_config() configures OpenSSL using the standard openssl.cnf and reads from the application section appname. If appname is \s-1NULL\s0 then the default section, openssl_conf, will be used. Errors are silently ignored. Multiple calls have no effect.

\fBOPENSSL_no_config() disables configuration. If called before OPENSSL_config() no configuration takes place.

Header "NOTES" The OPENSSL_config() function is designed to be a very simple \*(L"call it and forget it\*(R" function. It is however much better than nothing. Applications which need finer control over their configuration functionality should use the configuration functions such as CONF_modules_load() directly. This function is deprecated and its use should be avoided. Applications should instead call CONF_modules_load() during initialization (that is before starting any threads).

There are several reasons why calling the OpenSSL configuration routines is advisable. For example new \s-1ENGINE\s0 functionality was added to OpenSSL 0.9.7. In OpenSSL 0.9.7 control functions can be supported by ENGINEs, this can be used (among other things) to load dynamic ENGINEs from shared libraries (DSOs). However very few applications currently support the control interface and so very few can load and use dynamic ENGINEs. Equally in future more sophisticated ENGINEs will require certain control operations to customize them. If an application calls OPENSSL_config() it doesn't need to know or care about \s-1ENGINE\s0 control operations because they can be performed by editing a configuration file.

Applications should free up configuration at application closedown by calling \fBCONF_modules_free().

Header "RETURN VALUES" Neither OPENSSL_config() nor OPENSSL_no_config() return a value. Header "SEE ALSO" \fBconf\|(5), CONF_load_modules_file\|(3), \fBCONF_modules_free\|(3) Header "HISTORY" \fBOPENSSL_config() and OPENSSL_no_config() first appeared in OpenSSL 0.9.7