message: fix padding function
diff: @@ -50,8 +50,7 @@ fn vectorize(input: &BigUint, bytes: usize) -> Vec<u8> {
  let bytes_inp = input.to_bytes_le().len();
  match bytes.cmp(&bytes_inp) {
  Ordering::Greater => pad(input, bytes - bytes_inp),
  - Ordering::Equal => input.to_bytes_le(),
  - Ordering::Less => panic!("Desired length of the input is smaller than the length"),
  + Ordering::Equal | Ordering::Less => input.to_bytes_le(),
  }
  }
  