Hi heyjung, IMHO you should use the ed.getElementsByTagNameNS(....) method to get the xenc:... element because its a namespace qualified element. Please refer to DOM API documentation.
Regards, Werner > -----Ursprüngliche Nachricht----- > Von: news [mailto:[EMAIL PROTECTED] Im Auftrag von hyejung > Gesendet: Freitag, 23. Januar 2004 05:00 > An: [EMAIL PROTECTED] > Betreff: Decryption Exception > > > I have seperate classes which encrypt and decrypt input > stream which is XML > contents. > I am testing decryption using XmlCipher. > Encryption worked OK. However, in the decryptionOnly, I am > getting the > encrypted xml contents as an input and trying to convert its > contents back to > the original XML input. I am getting the error below > > java.lang.ArrayIndexOutOfBoundsException: -1 < 0 > at java.util.Vector.elementAt(Vector.java:437) > at org.apache.xerces.dom.DeepNodeListImpl.item(Unknown Source) > at > org.apache.xml.security.encryption.XMLCipher$Factory.newEncryptedData > (XMLCipher.java:2182) > at > org.apache.xml.security.encryption.XMLCipher.decryptToByteArray > (XMLCipher.java:1367) > at org.apache.xml.security.encryption.XMLCipher.decryptElement > (XMLCipher.java:1299) > at org.apache.xml.security.encryption.XMLCipher.doFinal > (XMLCipher.java:748) > at > XmlEncryptionTester.testDecryptOnly(XmlEncryptionTester.java:659) > > > --------------------------------------------------- > My encrypted xml contents > > <?xml version="1.0" encoding="UTF-8"?> > <xenc:EncryptedData Type="http://www.w3.org/2001/04/xmlenc#Element"; > xmlns:xenc="http://www.w3.org/2001/04/xmlenc#";> > <xenc:EncryptionMethod > Algorithm="http://www.w3.org/2001/04/xmlenc#tripledes-cbc"; > xmlns:xenc="http://www.w3.org/2001/04/xmlenc#"/> > <xenc:CipherData xmlns:xenc="http://www.w3.org/2001/04/xmlenc#";> > <xenc:CipherValue > xmlns:xenc="http://www.w3.org/2001/04/xmlenc#";>ECG7APZegNRhwIn > DUboc3Ret/T/wcGTaN > AillgDt8pyD8VLZSDntd+7u2jNkrjsT</xenc:CipherValue> > </xenc:CipherData> > </xenc:EncryptedData> > > ---------------------------------------------------- > Here is my codes. > If I used the document which parse a file when Document is > created, the > Decryption works OK. When documentbyParsingInputStream is > called to get the > Document in testDecryptionOnly method, the prefix value of > the ee element > ee = (Element) > ed.getElementsByTagName("xenc:EncryptedData").item(0); is null. > > private Document documentbyParsingInputStream(String inputFile) { > Document d = null; > try { > File f = new File(inputFile); > FileInputStream input = new FileInputStream(f); > > DocumentBuilderFactory dbf = > DocumentBuilderFactory.newInstance(); > DocumentBuilder db = dbf.newDocumentBuilder(); > dbf.setValidating(true); > dbf.setNamespaceAware(true); > d= db.parse(input); > } catch (Exception e) { > e.printStackTrace(); > System.exit(-1); > } > > return (d); > } > > > > > private Document documentbyParsingInputStream(String inputFile) { > Document d = null; > try { > File f = new File(inputFile); > FileInputStream input = new FileInputStream(f); > > DocumentBuilderFactory dbf = > DocumentBuilderFactory.newInstance(); > DocumentBuilder db = dbf.newDocumentBuilder(); > dbf.setValidating(true); > dbf.setNamespaceAware(true); > d= db.parse(input); > } catch (Exception e) { > e.printStackTrace(); > System.exit(-1); > } > return (d); > } > > > > public void testDecryptOnly() throws Exception{ > // if I call document method instread > // the documentbyParsingInputStream method , the > deryption works fine. > Document ed = document("encrypted_TrippleDes.xml"); // source > > // If documentbyParsingInputStream is called, then getting the > // exception above > //Document ed = > documentbyParsingInputStream("e_TrippleDes.xml");// source > Document dd = null; // target > Element e = ed.getDocumentElement(); > Element ee = null; > try { > // prepare for encryption > byte[] passPhrase = "24 Bytes per DESede key!".getBytes(); > DESedeKeySpec keySpec = new DESedeKeySpec(passPhrase); > SecretKeyFactory keyFactory = > SecretKeyFactory.getInstance("DESede"); > SecretKey key = keyFactory.generateSecret(keySpec); > //decrypt > cipher = XMLCipher.getInstance(XMLCipher.TRIPLEDES); > cipher.init(XMLCipher.DECRYPT_MODE, key); > ee = (Element) > ed.getElementsByTagName("xenc:EncryptedData").item(0); > > System.out.println(" ee.getPrefix() :"+ee.getPrefix()); > // ee.getPrefix() is xenc when document is called. > // ee.getPrefix() is null when > documentbyParsingInputStream is called. > > dd = cipher.doFinal(ed, ee); > target = toString(dd); > } catch (Exception ex) { > ex.printStackTrace(); > } > Assert.assertEquals( > toString(document().getDocumentElement()), target); > > } > > > I need to use an input as a stream when Document is created, > I can't work out > why prefix is null if the inputStream is passed to the parse > method when > creating the Document object. contents of the ed is same > regardless of a method > I call. What am I doing wrong ? Any ideas will be appreciated > Thanks > > hyejung > > >
