public static byte[] encode(byte[] b) throws Exception {

           ByteArrayOutputStream baos = new ByteArrayOutputStream();

           OutputStream b64os = MimeUtility.encode(baos, “base64”);

           b64os.write(b);

           b64os.close();

           return baos.toByteArray();

         }

 

         public static byte[] decode(byte[] b) throws Exception {

           ByteArrayInputStream bais = new ByteArrayInputStream(b);

           InputStream b64is = MimeUtility.decode(bais, “base64”);

           byte[] tmp = new byte[b.length];

           int n = b64is.read(tmp);

           byte[] res = new byte[n];

           System.arraycopy(tmp, 0, res, 0, n);

           return res;

         }