SSL_CONF_CTX_set1_prefix - Set configuration context command prefix
unsigned int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *prefix);
Command prefixes alter the commands recognised by subsequent
If the SSL_CONF_FLAG_CMDLINE flag is set then prefix checks are case sensitive and ``-'' is the default. In the unlikely even an application explicitly wants to set no prefix it must be explicitly set to ``''.
If the SSL_CONF_FLAG_FILE flag is set then prefix checks are case insensitive and no prefix is the default.
These functions were first added to OpenSSL 1.0.2