OPENSSL_CONFIG(3)          Library Functions Manual          OPENSSL_CONFIG(3)

NAME
     OPENSSL_config, OPENSSL_no_config - simple crypto and ssl library
     configuration

SYNOPSIS
     #include <openssl/conf.h>

     void
     OPENSSL_config(const char *appname);

     void
     OPENSSL_no_config(void);

DESCRIPTION
     OPENSSL_config() initializes the crypto library and calls
     CONF_modules_load_file(3) with the standard configuration file and the
     given appname.  If appname is NULL, then the default name openssl_conf is
     used.  Any errors are ignored.  Further calls to OPENSSL_config() have no
     effect.

     OPENSSL_no_config() suppresses the loading of the standard configuration
     file, so that any future calls to OPENSSL_config() or to
     OPENSSL_init_crypto(3) will ensure the library is initialized but no
     configuration file will be loaded.

     Calling these functions is optional.  All required initialization of the
     crypto libraries happens automatically when needed.

     To use a non-standard configuration file, refer to
     CONF_modules_load_file(3).

     Internally, OPENSSL_config() calls OPENSSL_init_crypto(3) and
     OPENSSL_load_builtin_modules(3).

     If an application is compiled with the preprocessor symbol
     OPENSSL_LOAD_CONF #define'd, OpenSSL_add_all_algorithms(3) automatically
     calls OPENSSL_config().

     Applications should free up configuration at application closedown by
     calling CONF_modules_free(3).

FILES
     /etc/ssl/openssl.cnf  standard configuration file

SEE ALSO
     CONF_modules_free(3), CONF_modules_load_file(3), crypto(3),
     OPENSSL_load_builtin_modules(3), OPENSSL_VERSION_NUMBER(3),
     openssl.cnf(5), x509v3.cnf(5)

HISTORY
     OPENSSL_config() and OPENSSL_no_config() first appeared in OpenSSL 0.9.7
     and have been available since OpenBSD 3.2.

Linux 6.8.2-arch2-1            November 19, 2023           Linux 6.8.2-arch2-1