code: private static int pack7Oid(int input, byte[] out, int ooffset) {
          byte[] b = new byte[4];
          b[0] = (byte)(input >> 24);
          b[1] = (byte)(input >> 16);
          b[2] = (byte)(input >> 8);
          b[3] = (byte)(input);
          return pack7Oid(b, 0, 4, out, ooffset);
      }
docs: Pack the int into a OID sub-identifier DER encoding