public static byte[] intToBytes(final int integer) {
    byte[] result = new byte[4];

    result[0] = (byte)((integer & 0xFF000000) >> 24);
    result[1] = (byte)((integer & 0x00FF0000) >> 16);
    result[2] = (byte)((integer & 0x0000FF00) >> 8);
    result[3] = (byte)(integer & 0x000000FF);

    return result;
  }

  public static byte[] longToBytes(long x) {
    ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
    buffer.putLong(x);
    return buffer.array();
  }

  public static String hexEncode(byte[] aInput) {
    StringBuilder result = new StringBuilder();
    char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    for (int idx = 0; idx < aInput.length; ++idx) {
      byte b = aInput[idx];
      result.append(digits[(b & 0xf0) >> 4]);
      result.append(digits[b & 0x0f]);
    }
    return result.toString();
  }

  public String getHexEncode() {
    // StringBuilder sb = new StringBuilder().append("\"").append(getFirstPart()).append("\"_\"")
    // .append(getSecondPart()).append("\"_\"").append(String.valueOf(getsUpdateDate())).append("\"_\"")
    // .append(String.valueOf(getsUpdateDate())).append("\"");

    StringBuilder hash = new StringBuilder();
    hash.append(Utils.hexEncode(Utils.intToBytes(getFirstPart())));
    hash.append(Utils.hexEncode(getSecondPart().getBytes()));
    hash.append(Utils.hexEncode(Utils.longToBytes(getsIssueDate())));
    hash.append(Utils.hexEncode(Utils.longToBytes(getsUpdateDate())));
    return hash.toString();
  }