// serialize element ...
Canonicalizer canon =
Canonicalizer.getInstance(Canonicalizer.ALGO_ID_C14N_WITH_COMMENTS);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
canon.setWriter(baos);
canon.notReset();
canon.canonicalizeSubtree(e);
baos.close();
String before = baos.toString("UTF-8");
EncryptedData encryptedData = cipher.encryptData