pub unsafe extern "C" fn falcon_sign_tree(
rng: *mut shake256_context,
sig: *mut c_void,
sig_len: *mut usize,
sig_type: c_int,
expanded_key: *const c_void,
data: *const c_void,
data_len: usize,
tmp: *mut c_void,
tmp_len: usize,
) -> c_int