Function SLHDSA_SHAKE_256F_sign 

pub unsafe extern "C" fn SLHDSA_SHAKE_256F_sign(
    out_signature: *mut u8,
    private_key: *const u8,
    msg: *const u8,
    msg_len: usize,
    context: *const u8,
    context_len: usize,
) -> c_int