84 lines
2.3 KiB
Java
84 lines
2.3 KiB
Java
/**
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*
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* Copyright 2017 Paul Schaub
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.omemo.element;
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import java.util.ArrayList;
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import java.util.List;
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import org.jivesoftware.smack.packet.NamedElement;
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import org.jivesoftware.smack.util.XmlStringBuilder;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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/**
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* Header element of the message. The header contains information about the sender and the encrypted keys for
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* the recipients, as well as the iv element for AES.
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*/
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public abstract class OmemoHeaderElement implements NamedElement {
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public static final String NAME_HEADER = "header";
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public static final String ATTR_SID = "sid";
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public static final String ATTR_IV = "iv";
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private final int sid;
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private final List<OmemoKeyElement> keys;
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private final byte[] iv;
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public OmemoHeaderElement(int sid, List<OmemoKeyElement> keys, byte[] iv) {
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this.sid = sid;
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this.keys = keys;
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this.iv = iv;
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}
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/**
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* Return the deviceId of the sender of the message.
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*
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* @return senders id
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*/
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public int getSid() {
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return sid;
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}
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public ArrayList<OmemoKeyElement> getKeys() {
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return new ArrayList<>(keys);
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}
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public byte[] getIv() {
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return iv != null ? iv.clone() : null;
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}
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@Override
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public String getElementName() {
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return NAME_HEADER;
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}
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@Override
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public CharSequence toXML(String enclosingNamespace) {
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XmlStringBuilder sb = new XmlStringBuilder(this);
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sb.attribute(ATTR_SID, getSid()).rightAngleBracket();
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for (OmemoKeyElement k : getKeys()) {
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sb.element(k);
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}
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sb.openElement(ATTR_IV).append(Base64.encodeToString(getIv())).closeElement(ATTR_IV);
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return sb.closeElement(this);
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}
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}
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