OmemoHeaderElement.java
- /**
- *
- * Copyright 2017 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.omemo.element;
- import java.util.ArrayList;
- import java.util.List;
- import org.jivesoftware.smack.packet.XmlElement;
- import org.jivesoftware.smack.packet.XmlEnvironment;
- import org.jivesoftware.smack.util.XmlStringBuilder;
- import org.jivesoftware.smack.util.stringencoder.Base64;
- import org.jivesoftware.smackx.omemo.util.OmemoConstants;
- /**
- * Header element of the message. The header contains information about the sender and the encrypted keys for
- * the recipients, as well as the iv element for AES.
- */
- public abstract class OmemoHeaderElement implements XmlElement {
- public static final String ELEMENT = "header";
- public static final String NAMESPACE = OmemoConstants.OMEMO_NAMESPACE_V_AXOLOTL;
- public static final String ATTR_SID = "sid";
- public static final String ATTR_IV = "iv";
- private final int sid;
- private final List<OmemoKeyElement> keys;
- private final byte[] iv;
- public OmemoHeaderElement(int sid, List<OmemoKeyElement> keys, byte[] iv) {
- this.sid = sid;
- this.keys = keys;
- this.iv = iv;
- }
- /**
- * Return the deviceId of the sender of the message.
- *
- * @return senders id
- */
- public int getSid() {
- return sid;
- }
- public ArrayList<OmemoKeyElement> getKeys() {
- return new ArrayList<>(keys);
- }
- public byte[] getIv() {
- return iv != null ? iv.clone() : null;
- }
- @Override
- public String getElementName() {
- return ELEMENT;
- }
- @Override
- public String getNamespace() {
- return NAMESPACE;
- }
- @Override
- public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
- XmlStringBuilder sb = new XmlStringBuilder(this, enclosingXmlEnvironment);
- sb.attribute(ATTR_SID, getSid()).rightAngleBracket();
- for (OmemoKeyElement k : getKeys()) {
- sb.append(k);
- }
- sb.openElement(ATTR_IV).append(Base64.encodeToString(getIv())).closeElement(ATTR_IV);
- return sb.closeElement(this);
- }
- }