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.\" ========================================================================
.\"
.IX Title "OPENSSL_config 3"
.TH OPENSSL_config 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
OPENSSL_config, OPENSSL_no_config \- simple OpenSSL configuration functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/conf.h>
\&
\& void OPENSSL_config(const char *appname);
\& void OPENSSL_no_config(void);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBOPENSSL_config()\fR configures OpenSSL using the standard \fBopenssl.cnf\fR and
reads from the application section \fBappname\fR. If \fBappname\fR is \s-1NULL\s0 then
the default section, \fBopenssl_conf\fR, will be used.
Errors are silently ignored.
Multiple calls have no effect.
.PP
\&\fBOPENSSL_no_config()\fR disables configuration. If called before \fBOPENSSL_config()\fR
no configuration takes place.
.SH "NOTES"
.IX Header "NOTES"
The \fBOPENSSL_config()\fR function is designed to be a very simple \*(L"call it and
forget it\*(R" function.
It is however \fBmuch\fR better than nothing. Applications which need finer
control over their configuration functionality should use the configuration
functions such as \fBCONF_modules_load()\fR directly. This function is deprecated
and its use should be avoided.
Applications should instead call \fBCONF_modules_load()\fR during
initialization (that is before starting any threads).
.PP
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 \fBOPENSSL_config()\fR it doesn't need to know or care about
\&\s-1ENGINE\s0 control operations because they can be performed by editing a
configuration file.
.PP
Applications should free up configuration at application closedown by calling
\&\fBCONF_modules_free()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
Neither \fBOPENSSL_config()\fR nor \fBOPENSSL_no_config()\fR return a value.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBconf\fR\|(5), \fBCONF_load_modules_file\fR\|(3),
\&\fBCONF_modules_free\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBOPENSSL_config()\fR and \fBOPENSSL_no_config()\fR first appeared in OpenSSL 0.9.7

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✏️ OPENSSL_no_config.3ssl