Function botan_spake2p_params_init_custom 

pub unsafe extern "C" fn botan_spake2p_params_init_custom(
    params: *mut botan_spake2p_params_t,
    group: botan_ec_group_t,
    seed: *const u8,
    seed_len: usize,
    hash_fn: *const c_char,
) -> c_int