message: fix the encrypt function
diff: @@ -60,7 +60,7 @@ impl HDKey {
  let len = input.len();
  - let mut out: Vec<u8> = repeat(0).take(len + TAG_LEN).collect();
  + let mut out: Vec<u8> = repeat(0).take(len).collect();
  let mut tag = [0;TAG_LEN];
  ctx.encrypt(&input, &mut out[0..len], &mut tag);
  