Function sign_message

pub fn sign_message<H, N>(
    keystore: Arc<dyn Keystore>,
    message: Message<H, N>,
    public: Public,
    round: u64,
    set_id: u64,
) -> Option<SignedMessage<H, N, Signature, Public>>
where
    H: Encode,
    N: Encode,

Localizes the message to the given set and round and signs the payload.