complete the chain during the TLS negotiation, CA certificates are additionally looked up in the locations of trusted CA certificates, see <a href="../man3/SSL_CTX_load_verify_locations.html">SSL_CTX_load_verify_locations(3)</a>.</p>

<p>The private keys loaded from file can be encrypted. In order to successfully load encrypted keys, a function returning the passphrase must have been supplied, see <a href="../man3/SSL_CTX_set_default_passwd_cb.html">SSL_CTX_set_default_passwd_cb(3)</a>. (Certificate files m