pub fn fn_verify_data(
server_finished: &HandshakeHash,
server_hello: &HandshakeHash,
server_key_share: &Option<Vec<u8>>,
psk: &Option<Vec<u8>>,
group: &NamedGroup,
) -> Result<Vec<u8>, FnError>
pub fn fn_verify_data(
server_finished: &HandshakeHash,
server_hello: &HandshakeHash,
server_key_share: &Option<Vec<u8>>,
psk: &Option<Vec<u8>>,
group: &NamedGroup,
) -> Result<Vec<u8>, FnError>