message: put back 12bytes
diff: @@ -10,7 +10,7 @@ use std::iter::repeat;
  use hdwallet::{XPub};
  -const NONCE : [u8;8] = [115,101,114,111,107,101,108,108,102,111,114,101]; // "serokellfore"
  +const NONCE : [u8;12] = [115,101,114,111,107,101,108,108,102,111,114,101]; // "serokellfore"
  const SALT : [u8;15] = [97,100,100,114,101,115,115,45,104,97,115,104,105,110,103]; // "address-hashing"
  const TAG_LEN : usize = 16;
  