docs: public final String toHexString(final byte[] pSource) {
      StringBuffer sb = new StringBuffer();
      for (byte b : pSource) {
        int bi = b;
        bi &= 0x000000FF;
        sb.append(ecncodingLetters[(bi >> 4) & 0x0F]);
        sb.append(ecncodingLetters[bi & 0x0F]);
        sb.append(" ");
      }
      return sb.toString();
    }