/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.xml.security.test.stax.encryption;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.ArrayList;
import java.util.List;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;
import javax.crypto.spec.SecretKeySpec;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;

import org.apache.xml.security.encryption.XMLCipher;
import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.ext.OutboundXMLSec;
import org.apache.xml.security.stax.ext.SecurePart;
import org.apache.xml.security.stax.ext.XMLSec;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;
import org.apache.xml.security.stax.ext.XMLSecurityProperties;
import org.apache.xml.security.test.stax.utils.XMLSecEventAllocator;
import org.apache.xml.security.test.stax.utils.XmlReaderToWriter;
import org.apache.xml.security.utils.XMLUtils;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

/**
 * A set of test-cases for Encryption.
 * 
 * @author $Author: coheigea $
 * @version $Revision: 1236690 $ $Date: 2012-01-27 14:07:10 +0000 (Fri, 27 Jan 2012) $
 */
public class EncryptionCreationTest extends org.junit.Assert {

    private XMLInputFactory xmlInputFactory;

    @Before
    public void setUp() throws Exception {
        org.apache.xml.security.Init.init();

        xmlInputFactory = XMLInputFactory.newInstance();
        xmlInputFactory.setEventAllocator(new XMLSecEventAllocator());
    }

    @Test
    public void testEncryptionContentCreation() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        SecretKey key = generateDESSecretKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Content);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }

    @Test
    public void testExceptionOnElementToEncryptNotFound() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);

        // Set the key up
        SecretKey key = generateDESSecretKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");

        SecurePart securePart =
                new SecurePart(new QName("urn:example:po", "NotExistingElement"), SecurePart.Modifier.Content);
        properties.addEncryptionPart(securePart);

        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");

        InputStream sourceDocument =
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);

        try {
            XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
            xmlStreamWriter.close();
            Assert.fail("Exception expected");
        } catch (XMLStreamException e) {
            Assert.assertTrue(e.getCause() instanceof XMLSecurityException);
            Assert.assertEquals("Part to encrypt not found: {urn:example:po}NotExistingElement", e.getCause().getMessage());
        }
    }
    
    @Test
    public void testEncryptionElementCreation() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        SecretKey key = generateDESSecretKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    @Test
    public void testStrongEncryption() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        keygen.init(256);
        SecretKey key = keygen.generateKey();
        properties.setEncryptionKey(key);
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Content);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#aes256-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    @Test
    public void testEncryptionMultipleElements() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        SecretKey key = generateDESSecretKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
            new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Content);
        properties.addEncryptionPart(securePart);
        securePart = 
            new SecurePart(new QName("urn:example:po", "ShippingAddress"), SecurePart.Modifier.Content);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 2);
    }
    
    // Test encryption using a generated AES 128 bit key that is encrypted using a AES 192 bit key. 
    @Test
    public void testAES128ElementAES192KWCipherUsingKEKOutbound() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] bits192 = "abcdefghijklmnopqrstuvwx".getBytes();
        SecretKey transportKey = new SecretKeySpec(bits192, "AES");
        properties.setEncryptionKeyTransportAlgorithm("http://www.w3.org/2001/04/xmlenc#kw-aes192");
        properties.setEncryptionTransportKey(transportKey);
        
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        keygen.init(128);
        SecretKey key = keygen.generateKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes128-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", null, transportKey, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    // Test encryption using a generated AES 256 bit key that is encrypted using an RSA key. 
    @Test
    public void testAES256ElementRSAKWCipherUsingKEKOutbound() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        // Generate an RSA key
        KeyPairGenerator rsaKeygen = KeyPairGenerator.getInstance("RSA");
        KeyPair kp = rsaKeygen.generateKeyPair();
        PrivateKey priv = kp.getPrivate();
        PublicKey pub = kp.getPublic();
        properties.setEncryptionTransportKey(pub);
        properties.setEncryptionKeyTransportAlgorithm("http://www.w3.org/2001/04/xmlenc#rsa-1_5");
        
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        keygen.init(256);
        SecretKey key = keygen.generateKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes256-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", null, priv, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    // Test encryption using a generated AES 192 bit key that is encrypted using a 3DES key.  
    @Test
    public void testAES192Element3DESKWCipher() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        SecretKey transportKey = generateDESSecretKey();
        properties.setEncryptionKeyTransportAlgorithm("http://www.w3.org/2001/04/xmlenc#kw-tripledes");
        properties.setEncryptionTransportKey(transportKey);
        
        KeyGenerator keygen = KeyGenerator.getInstance("AES");
        keygen.init(192);
        SecretKey key = keygen.generateKey();
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes192-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", null, transportKey, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    @Test
    public void testTripleDesElementCipher() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] passPhrase = "24 Bytes per DESede key!".getBytes();
        DESedeKeySpec keySpec = new DESedeKeySpec(passPhrase);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        SecretKey key = keyFactory.generateSecret(keySpec);
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    @Test
    public void testAes128ElementCipher() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] bits128 = {
                (byte) 0x10, (byte) 0x11, (byte) 0x12, (byte) 0x13,
                (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17,
                (byte) 0x18, (byte) 0x19, (byte) 0x1A, (byte) 0x1B,
                (byte) 0x1C, (byte) 0x1D, (byte) 0x1E, (byte) 0x1F};
        SecretKey key = new SecretKeySpec(bits128, "AES");
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes128-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#aes128-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    @Test
    public void testAes192ElementCipher() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] bits192 = {
                (byte) 0x08, (byte) 0x09, (byte) 0x0A, (byte) 0x0B,
                (byte) 0x0C, (byte) 0x0D, (byte) 0x0E, (byte) 0x0F,
                (byte) 0x10, (byte) 0x11, (byte) 0x12, (byte) 0x13,
                (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17,
                (byte) 0x18, (byte) 0x19, (byte) 0x1A, (byte) 0x1B,
                (byte) 0x1C, (byte) 0x1D, (byte) 0x1E, (byte) 0x1F};
        SecretKey key = new SecretKeySpec(bits192, "AES");
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes192-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc =
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#aes192-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }

    @Test
    public void testAes256ElementCipher() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] bits256 = {
                (byte) 0x00, (byte) 0x01, (byte) 0x02, (byte) 0x03,
                (byte) 0x04, (byte) 0x05, (byte) 0x06, (byte) 0x07,
                (byte) 0x08, (byte) 0x09, (byte) 0x0A, (byte) 0x0B,
                (byte) 0x0C, (byte) 0x0D, (byte) 0x0E, (byte) 0x0F,
                (byte) 0x10, (byte) 0x11, (byte) 0x12, (byte) 0x13,
                (byte) 0x14, (byte) 0x15, (byte) 0x16, (byte) 0x17,
                (byte) 0x18, (byte) 0x19, (byte) 0x1A, (byte) 0x1B,
                (byte) 0x1C, (byte) 0x1D, (byte) 0x1E, (byte) 0x1F};
        SecretKey key = new SecretKeySpec(bits256, "AES");
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes256-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#aes256-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    // Test case for when the entire document is encrypted and decrypted
    // In this case the EncryptedData becomes the root element of the document
    @Test
    public void testTripleDesDocumentCipher() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] passPhrase = "24 Bytes per DESede key!".getBytes();
        DESedeKeySpec keySpec = new DESedeKeySpec(passPhrase);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        SecretKey key = keyFactory.generateSecret(keySpec);
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PurchaseOrder"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", key, null, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }
    
    // Test physical representation of decrypted element, see SANTUARIO-309
    @Test
    public void testPhysicalRepresentation1() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] bits192 = "abcdefghijklmnopqrstuvwx".getBytes();
        DESedeKeySpec keySpec = new DESedeKeySpec(bits192);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        SecretKey key = keyFactory.generateSecret(keySpec);
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("ns.com", "elem"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        final String DATA1 = 
                "<ns:root xmlns:ns=\"ns.com\"><ns:elem xmlns:ns2=\"ns2.com\">11</ns:elem></ns:root>";
        InputStream sourceDocument = new ByteArrayInputStream(DATA1.getBytes("UTF8"));
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("ns.com", "elem");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", key, null, document);
        
        Element decrElem = (Element)doc.getDocumentElement().getFirstChild();
        assertEquals("ns:elem", decrElem.getNodeName());
        assertEquals("ns.com", decrElem.getNamespaceURI());
        assertEquals(1, decrElem.getAttributes().getLength());
        Attr attr = (Attr)decrElem.getAttributes().item(0);
        assertEquals("xmlns:ns2", attr.getName());
        assertEquals("ns2.com", attr.getValue());
    }

    // Test default namespace undeclaration is preserved
    @Test
    public void testPhysicalRepresentation2() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up
        byte[] bits192 = "abcdefghijklmnopqrstuvwx".getBytes();
        DESedeKeySpec keySpec = new DESedeKeySpec(bits192);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        SecretKey key = keyFactory.generateSecret(keySpec);
        properties.setEncryptionKey(key);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#tripledes-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("", "elem"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        final String DATA2 = 
                "<ns:root xmlns=\"defns.com\" xmlns:ns=\"ns.com\"><elem xmlns=\"\">11</elem></ns:root>";
        InputStream sourceDocument = new ByteArrayInputStream(DATA2.getBytes("UTF8"));
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("", "elem");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", key, null, document);
        
        Element decrElem = (Element)doc.getDocumentElement().getFirstChild();
        assertEquals("elem", decrElem.getNodeName());
        assertNull(decrElem.getNamespaceURI());
        assertEquals(1, decrElem.getAttributes().getLength());
        Attr attr = (Attr)decrElem.getAttributes().item(0);
        assertEquals("xmlns", attr.getName());
        assertEquals("", attr.getValue());
    }
    
    @Test
    public void testTransportKey() throws Exception {
        // Set up the Configuration
        XMLSecurityProperties properties = new XMLSecurityProperties();
        List<XMLSecurityConstants.Action> actions = new ArrayList<XMLSecurityConstants.Action>();
        actions.add(XMLSecurityConstants.ENCRYPT);
        properties.setActions(actions);
        
        // Set the key up - only specify a transport key, so the session key gets generated
        byte[] bits192 = "abcdefghijklmnopqrstuvwx".getBytes();
        SecretKey transportKey = new SecretKeySpec(bits192, "AES");
        properties.setEncryptionKeyTransportAlgorithm("http://www.w3.org/2001/04/xmlenc#kw-aes192");
        properties.setEncryptionTransportKey(transportKey);
        properties.setEncryptionSymAlgorithm("http://www.w3.org/2001/04/xmlenc#aes128-cbc");
        
        SecurePart securePart = 
               new SecurePart(new QName("urn:example:po", "PaymentInfo"), SecurePart.Modifier.Element);
        properties.addEncryptionPart(securePart);
        
        OutboundXMLSec outboundXMLSec = XMLSec.getOutboundXMLSec(properties);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        XMLStreamWriter xmlStreamWriter = outboundXMLSec.processOutMessage(baos, "UTF-8");
        
        InputStream sourceDocument = 
                this.getClass().getClassLoader().getResourceAsStream(
                        "ie/baltimore/merlin-examples/merlin-xmlenc-five/plaintext.xml");
        XMLStreamReader xmlStreamReader = xmlInputFactory.createXMLStreamReader(sourceDocument);
        
        XmlReaderToWriter.writeAll(xmlStreamReader, xmlStreamWriter);
        xmlStreamWriter.close();
        
        // System.out.println("Got:\n" + new String(baos.toByteArray(), "UTF-8"));
        
        Document document = 
            XMLUtils.createDocumentBuilder(false).parse(new ByteArrayInputStream(baos.toByteArray()));
        
        NodeList nodeList = document.getElementsByTagNameNS("urn:example:po", "PaymentInfo");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        // Check the CreditCard encrypted ok
        nodeList = document.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 0);
        
        nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Assert.assertEquals(nodeList.getLength(), 1);
        
        // Decrypt using DOM API
        Document doc = 
            decryptUsingDOM("http://www.w3.org/2001/04/xmlenc#tripledes-cbc", null, transportKey, document);
        
        // Check the CreditCard decrypted ok
        nodeList = doc.getElementsByTagNameNS("urn:example:po", "CreditCard");
        Assert.assertEquals(nodeList.getLength(), 1);
    }

    /**
     * Generate a secret key
     */
    private SecretKey generateDESSecretKey() throws Exception {
        byte[] bits192 = "abcdefghijklmnopqrstuvwx".getBytes();
        DESedeKeySpec keySpec = new DESedeKeySpec(bits192);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
        return keyFactory.generateSecret(keySpec);
    }
    
    /**
     * Decrypt the document using DOM API and run some tests on the decrypted Document.
     */
    private Document decryptUsingDOM(
        String algorithm, 
        SecretKey secretKey,
        Key wrappingKey,
        Document document
    ) throws Exception {
        XMLCipher cipher = XMLCipher.getInstance(algorithm);
        cipher.init(XMLCipher.DECRYPT_MODE, secretKey);
        if (wrappingKey != null) {
            cipher.setKEK(wrappingKey);
        }
        
        NodeList nodeList = document.getElementsByTagNameNS(
                XMLSecurityConstants.TAG_xenc_EncryptedData.getNamespaceURI(),
                XMLSecurityConstants.TAG_xenc_EncryptedData.getLocalPart()
            );
        Element ee = (Element)nodeList.item(0);
        return cipher.doFinal(document, ee);
    }

}