Function botan_spake2p_prover_process_message 

pub unsafe extern "C" fn botan_spake2p_prover_process_message(
    prover: botan_spake2p_prover_t,
    rng: botan_rng_t,
    peer_message: *const u8,
    peer_message_len: usize,
    ctx: botan_view_ctx,
    view: botan_view_bin_fn,
) -> c_int