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This commit is contained in:
Paul Schaub 2018-05-21 15:42:04 +02:00
parent 6e7145801e
commit a234760233
14 changed files with 258 additions and 82 deletions
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16
smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/BouncyCastleIdentityStore.java
View file

@ -1,3 +1,19 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed 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.jivesoftware.smackx.ox.bouncycastle;
import java.io.FileNotFoundException;

22
smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/BouncycastleOpenPgpProvider.java → smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/BouncyCastleOpenPgpProvider.java
View file

@ -33,6 +33,7 @@ import org.jivesoftware.smackx.ox.OpenPgpMessage;
import org.jivesoftware.smackx.ox.OpenPgpProvider;
import org.jivesoftware.smackx.ox.element.OpenPgpElement;
import org.jivesoftware.smackx.ox.element.PubkeyElement;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.BouncyGPG;
import name.neuhalfen.projects.crypto.bouncycastle.openpgp.algorithms.PublicKeySize;
@ -50,14 +51,14 @@ import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.io.Streams;
import org.jxmpp.jid.BareJid;
public class BouncycastleOpenPgpProvider implements OpenPgpProvider {
public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
private final BareJid ourJid;
private final InMemoryKeyring ourKeys;
private final Long ourKeyId;
private final Map<BareJid, InMemoryKeyring> theirKeys = new HashMap<>();
public BouncycastleOpenPgpProvider(BareJid ourJid) throws IOException, PGPException, NoSuchAlgorithmException {
public BouncyCastleOpenPgpProvider(BareJid ourJid) throws IOException, PGPException, NoSuchAlgorithmException {
this.ourJid = ourJid;
PGPSecretKeyRing ourKey = generateKey(ourJid).generateSecretKeyRing();
ourKeyId = ourKey.getPublicKey().getKeyID();
@ -87,6 +88,11 @@ public class BouncycastleOpenPgpProvider implements OpenPgpProvider {
contactsKeyring.addPublicKey(decoded);
}
@Override
public void processPublicKeysListElement(PublicKeysListElement listElement, BareJid from) throws Exception {
}
@Override
public OpenPgpElement signAndEncrypt(InputStream inputStream, Set<BareJid> recipients)
throws Exception {
@ -138,6 +144,16 @@ public class BouncycastleOpenPgpProvider implements OpenPgpProvider {
return new OpenPgpElement(base64);
}
@Override
public OpenPgpElement sign(InputStream inputStream) throws Exception {
return null;
}
@Override
public OpenPgpElement encrypt(InputStream inputStream, Set<BareJid> recipients) throws Exception {
return null;
}
@Override
public OpenPgpMessage decryptAndVerify(OpenPgpElement element, BareJid sender) throws Exception {
InMemoryKeyring decryptionConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
@ -168,7 +184,7 @@ public class BouncycastleOpenPgpProvider implements OpenPgpProvider {
Streams.pipeAll(decrypted, decryptedOut);
return new OpenPgpMessage(null, new String(decryptedOut.toByteArray(), Charset.forName("UTF-8")));
return new OpenPgpMessage(new String(decryptedOut.toByteArray(), Charset.forName("UTF-8")));
}
@Override

20
smack-openpgp-bouncycastle/src/main/java/org/jivesoftware/smackx/ox/bouncycastle/FileBasedBouncyCastleIdentityStore.java
View file

@ -1,3 +1,19 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed 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.jivesoftware.smackx.ox.bouncycastle;
import java.io.DataInputStream;
@ -56,6 +72,10 @@ public class FileBasedBouncyCastleIdentityStore implements BouncyCastleIdentityS
public PublicKeysListElement loadPubkeyList(BareJid jid) throws IOException {
File contactsDir = contactsDir(jid);
File source = new File(contactsDir, "pubkey_list");
if (!source.exists()) {
LOGGER.log(Level.FINE, "File " + source.getAbsolutePath() + " does not exist. Returning null.");
return null;
}
DataInputStream dataIn = new DataInputStream(new FileInputStream(source));
PublicKeysListElement.Builder builder = PublicKeysListElement.builder();

4
smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/BasicEncryptionTest.java
View file

@ -116,8 +116,8 @@ public class BasicEncryptionTest extends SmackTestSuite {
throws IOException, PGPException, NoSuchAlgorithmException, NoSuchProviderException, SignatureException {
final String alice = "alice@wonderland.lit";
final String bob = "bob@builder.tv";
PGPKeyRingGenerator g1 = BouncycastleOpenPgpProvider.generateKey(JidCreate.bareFrom(alice));
PGPKeyRingGenerator g2 = BouncycastleOpenPgpProvider.generateKey(JidCreate.bareFrom(bob));
PGPKeyRingGenerator g1 = BouncyCastleOpenPgpProvider.generateKey(JidCreate.bareFrom(alice));
PGPKeyRingGenerator g2 = BouncyCastleOpenPgpProvider.generateKey(JidCreate.bareFrom(bob));
PGPSecretKey s1 = g1.generateSecretKeyRing().getSecretKey();
PGPSecretKey s2 = g2.generateSecretKeyRing().getSecretKey();
PGPPublicKey p1 = g1.generatePublicKeyRing().getPublicKey();

6
smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/BouncycastleOpenPgpProviderTest.java → smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/BouncyCastleOpenPgpProviderTest.java
View file

@ -37,7 +37,7 @@ import org.jxmpp.jid.BareJid;
import org.jxmpp.jid.Jid;
import org.jxmpp.jid.impl.JidCreate;
public class BouncycastleOpenPgpProviderTest extends SmackTestSuite {
public class BouncyCastleOpenPgpProviderTest extends SmackTestSuite {
@Test
public void encryptAndSign_decryptAndVerifyElementTest() throws Exception {
@ -46,8 +46,8 @@ public class BouncycastleOpenPgpProviderTest extends SmackTestSuite {
// Create providers for alice and the cat
BareJid alice = JidCreate.bareFrom("alice@wonderland.lit");
BareJid cheshire = JidCreate.bareFrom("cheshire@wonderland.lit");
BouncycastleOpenPgpProvider aliceProvider = new BouncycastleOpenPgpProvider(alice);
BouncycastleOpenPgpProvider cheshireProvider = new BouncycastleOpenPgpProvider(cheshire);
BouncyCastleOpenPgpProvider aliceProvider = new BouncyCastleOpenPgpProvider(alice);
BouncyCastleOpenPgpProvider cheshireProvider = new BouncyCastleOpenPgpProvider(cheshire);
// dry exchange keys
PubkeyElement aliceKeys = aliceProvider.createPubkeyElement();

66
smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/FileBasedBouncyCastleIdentityStoreTest.java
View file

@ -1,14 +1,31 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed 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.jivesoftware.smackx.ox.bouncycastle;
import static junit.framework.TestCase.assertEquals;
import static junit.framework.TestCase.assertNull;
import java.io.File;
import java.io.IOException;
import java.text.ParseException;
import java.util.Date;
import java.util.Stack;
import org.jivesoftware.smack.test.util.SmackTestSuite;
import org.jivesoftware.smack.util.FileUtils;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
import org.junit.After;
@ -34,36 +51,6 @@ public class FileBasedBouncyCastleIdentityStoreTest extends SmackTestSuite {
}
}
@Before
public void before() {
deleteStore();
}
@After
public void after() {
deleteStore();
}
public void deleteStore() {
File[] currList;
Stack<File> stack = new Stack<>();
stack.push(storePath);
while (!stack.isEmpty()) {
if (stack.lastElement().isDirectory()) {
currList = stack.lastElement().listFiles();
if (currList != null && currList.length > 0) {
for (File curr : currList) {
stack.push(curr);
}
} else {
stack.pop().delete();
}
} else {
stack.pop().delete();
}
}
}
@Test
public void writeReadPublicKeysLists() throws ParseException, IOException {
BareJid jid = JidCreate.bareFrom("edward@snowden.org");
@ -78,9 +65,26 @@ public class FileBasedBouncyCastleIdentityStoreTest extends SmackTestSuite {
.build();
FileBasedBouncyCastleIdentityStore store = new FileBasedBouncyCastleIdentityStore(storePath);
PublicKeysListElement shouldBeNull = store.loadPubkeyList(jid);
assertNull(shouldBeNull);
store.storePubkeyList(jid, list);
PublicKeysListElement retrieved = store.loadPubkeyList(jid);
assertEquals(list.getMetadata(), retrieved.getMetadata());
}
@Before
public void before() {
deleteStore();
}
@After
public void after() {
deleteStore();
}
public void deleteStore() {
FileUtils.deleteDirectory(storePath);
}
}

2
smack-openpgp-bouncycastle/src/test/java/org/jivesoftware/smackx/ox/bouncycastle/KeyGenerationTest.java
View file

@ -28,7 +28,7 @@ public class KeyGenerationTest {
@Test
public void createSecretKey() throws Exception {
PGPSecretKey secretKey = BouncycastleOpenPgpProvider
PGPSecretKey secretKey = BouncyCastleOpenPgpProvider
.generateKey(JidCreate.bareFrom("alice@wonderland.lit"))
.generateSecretKeyRing()
.getSecretKey();

26
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/CorruptedOpenPgpKeyException.java Normal file
View file

@ -0,0 +1,26 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed 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.jivesoftware.smackx.ox;
public class CorruptedOpenPgpKeyException extends Exception {
private static final long serialVersionUID = 1L;
public CorruptedOpenPgpKeyException() {
super();
}
}

50
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpManager.java
View file

@ -20,12 +20,15 @@ import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.WeakHashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jivesoftware.smack.Manager;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.util.Async;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
import org.jivesoftware.smackx.ox.element.PubkeyElement;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
@ -33,6 +36,7 @@ import org.jivesoftware.smackx.pep.PEPListener;
import org.jivesoftware.smackx.pep.PEPManager;
import org.jivesoftware.smackx.pubsub.EventElement;
import org.jivesoftware.smackx.pubsub.Item;
import org.jivesoftware.smackx.pubsub.ItemsExtension;
import org.jivesoftware.smackx.pubsub.LeafNode;
import org.jivesoftware.smackx.pubsub.PayloadItem;
import org.jivesoftware.smackx.pubsub.PubSubException;
@ -41,7 +45,9 @@ import org.jivesoftware.smackx.pubsub.PubSubManager;
import org.jxmpp.jid.BareJid;
import org.jxmpp.jid.EntityBareJid;
public final class OpenPgpManager extends Manager implements PEPListener {
public final class OpenPgpManager extends Manager {
private static final Logger LOGGER = Logger.getLogger(OpenPgpManager.class.getName());
public static final String PEP_NODE_PUBLIC_KEYS = "urn:xmpp:openpgp:0:public-keys";
public static final String PEP_NODE_PUBLIC_KEYS_NOTIFY = PEP_NODE_PUBLIC_KEYS + "+notify";
@ -57,7 +63,7 @@ public final class OpenPgpManager extends Manager implements PEPListener {
super(connection);
// Subscribe to public key changes
PEPManager.getInstanceFor(connection()).addPEPListener(this);
PEPManager.getInstanceFor(connection()).addPEPListener(metadataListener);
ServiceDiscoveryManager.getInstanceFor(connection())
.addFeature(PEP_NODE_PUBLIC_KEYS_NOTIFY);
}
@ -73,7 +79,6 @@ public final class OpenPgpManager extends Manager implements PEPListener {
public void setOpenPgpProvider(OpenPgpProvider provider) {
this.provider = provider;
}
public void publishPublicKey() throws Exception {
@ -89,6 +94,7 @@ public final class OpenPgpManager extends Manager implements PEPListener {
LeafNode keyNode = pm.getOrCreateLeafNode(keyNodeName);
List<Item> items = keyNode.getItems(1);
if (items.isEmpty()) {
LOGGER.log(Level.FINE, "Node " + keyNodeName + " is empty. Publish.");
keyNode.publish(new PayloadItem<>(pubkeyElement));
}
@ -116,11 +122,17 @@ public final class OpenPgpManager extends Manager implements PEPListener {
return fetchPubkeysList(connection().getUser().asBareJid());
}
public void deletePubkeysListNode()
throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
SmackException.NoResponseException {
PubSubManager pm = PubSubManager.getInstance(connection(), connection().getUser().asBareJid());
pm.deleteNode(PEP_NODE_PUBLIC_KEYS);
}
public PublicKeysListElement fetchPubkeysList(BareJid jid)
throws InterruptedException, PubSubException.NotALeafNodeException, SmackException.NoResponseException,
SmackException.NotConnectedException, XMPPException.XMPPErrorException,
PubSubException.NotAPubSubNodeException
{
PubSubException.NotAPubSubNodeException {
PubSubManager pm = PubSubManager.getInstance(connection(), jid);
LeafNode node = pm.getLeafNode(PEP_NODE_PUBLIC_KEYS);
@ -171,8 +183,30 @@ public final class OpenPgpManager extends Manager implements PEPListener {
}
}
@Override
public void eventReceived(EntityBareJid from, EventElement event, Message message) {
public boolean canSyncSecretKey()
throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
SmackException.NoResponseException {
boolean pep = PEPManager.getInstanceFor(connection()).isSupported();
boolean whitelist = PubSubManager.getInstance(connection(), connection().getUser().asBareJid())
.getSupportedFeatures().containsFeature("http://jabber.org/protocol/pubsub#access-whitelist");
return pep && whitelist;
}
private final PEPListener metadataListener = new PEPListener() {
@Override
public void eventReceived(EntityBareJid from, final EventElement event, Message message) {
if (PEP_NODE_PUBLIC_KEYS.equals(event.getEvent().getNode())) {
LOGGER.log(Level.INFO, "Received OpenPGP metadata update from " + from);
Async.go(new Runnable() {
@Override
public void run() {
ItemsExtension items = (ItemsExtension) event.getExtensions().get(0);
PayloadItem<?> payload = (PayloadItem) items.getItems().get(0);
PublicKeysListElement listElement = (PublicKeysListElement) payload.getPayload();
}
}, "ProcessOXPublicKey");
}
}
};
}

42
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpMessage.java
View file

@ -18,7 +18,6 @@ package org.jivesoftware.smackx.ox;
import java.io.IOException;
import org.jivesoftware.smackx.ox.element.CryptElement;
import org.jivesoftware.smackx.ox.element.OpenPgpContentElement;
import org.jivesoftware.smackx.ox.element.SignElement;
import org.jivesoftware.smackx.ox.element.SigncryptElement;
@ -40,9 +39,8 @@ public class OpenPgpMessage {
private OpenPgpContentElement openPgpContentElement;
public OpenPgpMessage(State state, String content) {
public OpenPgpMessage(String content) {
this.element = content;
this.state = state;
}
public OpenPgpContentElement getOpenPgpContentElement() throws XmlPullParserException, IOException {
@ -56,38 +54,16 @@ public class OpenPgpMessage {
return;
openPgpContentElement = OpenPgpContentElementProvider.parseOpenPgpContentElement(element);
if (state == null) {
if (openPgpContentElement instanceof SigncryptElement) {
state = State.signcrypt;
} else if (openPgpContentElement instanceof SignElement) {
state = State.sign;
} else {
state = State.crypt;
}
if (openPgpContentElement == null) {
return;
}
switch (state) {
case signcrypt:
if (!(openPgpContentElement instanceof SigncryptElement)) {
throw new IllegalStateException(
"The used OpenPGP content element does not match the mode used in the raw OpenPGP message. Content element: "
+ openPgpContentElement.getElementName() + ". Mode: " + state);
}
break;
case sign:
if (!(openPgpContentElement instanceof SignElement)) {
throw new IllegalStateException(
"The used OpenPGP content element does not match the mode used in the raw OpenPGP message. Content element: "
+ openPgpContentElement.getElementName() + ". Mode: " + state);
}
break;
case crypt:
if (!(openPgpContentElement instanceof CryptElement)) {
throw new IllegalStateException(
"The used OpenPGP content element does not match the mode used in the raw OpenPGP message. Content element: "
+ openPgpContentElement.getElementName() + ". Mode: " + state);
}
break;
if (openPgpContentElement instanceof SigncryptElement) {
state = State.signcrypt;
} else if (openPgpContentElement instanceof SignElement) {
state = State.sign;
} else {
state = State.crypt;
}
}
}

31
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpMessageListener.java Normal file
View file

@ -0,0 +1,31 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed 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.jivesoftware.smackx.ox;
import org.jivesoftware.smackx.ox.element.CryptElement;
import org.jivesoftware.smackx.ox.element.SignElement;
import org.jivesoftware.smackx.ox.element.SigncryptElement;
import org.jxmpp.jid.BareJid;
public interface OpenPgpMessageListener {
void signcryptElementReceived(BareJid from, SigncryptElement signcryptElement);
void signElementReceived(BareJid from, SignElement signElement);
void cryptElementReceived(BareJid from, CryptElement cryptElement);
}

7
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/OpenPgpProvider.java
View file

@ -21,6 +21,7 @@ import java.util.Set;
import org.jivesoftware.smackx.ox.element.OpenPgpElement;
import org.jivesoftware.smackx.ox.element.PubkeyElement;
import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
import org.jxmpp.jid.BareJid;
@ -30,10 +31,16 @@ public interface OpenPgpProvider {
OpenPgpElement signAndEncrypt(InputStream inputStream, Set<BareJid> recipients) throws Exception;
OpenPgpElement sign(InputStream inputStream) throws Exception;
OpenPgpElement encrypt(InputStream inputStream, Set<BareJid> recipients) throws Exception;
PubkeyElement createPubkeyElement() throws Exception;
void processPubkeyElement(PubkeyElement element, BareJid from) throws Exception;
void processPublicKeysListElement(PublicKeysListElement listElement, BareJid from) throws Exception;
/**
* Return the OpenPGP v4-fingerprint of our key in hexadecimal upper case.
*

46
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/PubSubHelper.java Normal file
View file

@ -0,0 +1,46 @@
/**
*
* Copyright 2018 Paul Schaub.
*
* Licensed 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.jivesoftware.smackx.ox;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smackx.pubsub.AccessModel;
import org.jivesoftware.smackx.pubsub.ConfigureForm;
import org.jivesoftware.smackx.pubsub.LeafNode;
public class PubSubHelper {
public static void whitelist(LeafNode node)
throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
SmackException.NoResponseException {
ConfigureForm config = node.getNodeConfiguration();
if (config.getAccessModel() != AccessModel.whitelist) {
config.setAccessModel(AccessModel.whitelist);
node.sendConfigurationForm(config);
}
}
public static void open(LeafNode node)
throws XMPPException.XMPPErrorException, SmackException.NotConnectedException, InterruptedException,
SmackException.NoResponseException {
ConfigureForm config = node.getNodeConfiguration();
if (config.getAccessModel() != AccessModel.open) {
config.setAccessModel(AccessModel.open);
node.sendConfigurationForm(config);
}
}
}

2
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/provider/OpenPgpContentElementProvider.java
View file

@ -55,7 +55,7 @@ public abstract class OpenPgpContentElementProvider<O extends OpenPgpContentElem
}
public static OpenPgpContentElement parseOpenPgpContentElement(XmlPullParser parser)
throws XmlPullParserException, IOException {
throws XmlPullParserException {
try {
switch (parser.getName()) {
case SigncryptElement.ELEMENT: