mirror of
https://github.com/vanitasvitae/Smack.git
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238 lines
8.5 KiB
Java
238 lines
8.5 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.HashMap;
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import java.util.Map;
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import org.jivesoftware.smack.packet.ExtensionElement;
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import org.jivesoftware.smack.util.StringUtils;
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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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* Class that represents an OMEMO Bundle element.
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*
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* @author Paul Schaub
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*/
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public abstract class OmemoBundleElement implements ExtensionElement {
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public static final String BUNDLE = "bundle";
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public static final String SIGNED_PRE_KEY_PUB = "signedPreKeyPublic";
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public static final String SIGNED_PRE_KEY_ID = "signedPreKeyId";
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public static final String SIGNED_PRE_KEY_SIG = "signedPreKeySignature";
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public static final String IDENTITY_KEY = "identityKey";
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public static final String PRE_KEYS = "prekeys";
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public static final String PRE_KEY_PUB = "preKeyPublic";
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public static final String PRE_KEY_ID = "preKeyId";
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private final int signedPreKeyId;
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private final String signedPreKeyB64;
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private byte[] signedPreKey;
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private final String signedPreKeySignatureB64;
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private byte[] signedPreKeySignature;
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private final String identityKeyB64;
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private byte[] identityKey;
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private final HashMap<Integer, String> preKeysB64;
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private HashMap<Integer, byte[]> preKeys;
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/**
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* Constructor to create a Bundle Element from base64 Strings.
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*
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* @param signedPreKeyId id
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* @param signedPreKeyB64 base64 encoded signedPreKey
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* @param signedPreKeySigB64 base64 encoded signedPreKeySignature
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* @param identityKeyB64 base64 encoded identityKey
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* @param preKeysB64 HashMap of base64 encoded preKeys
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*/
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public OmemoBundleElement(int signedPreKeyId, String signedPreKeyB64, String signedPreKeySigB64, String identityKeyB64, HashMap<Integer, String> preKeysB64) {
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if (signedPreKeyId <= 0) {
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throw new IllegalArgumentException("signedPreKeyId MUST be greater than 0.");
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}
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this.signedPreKeyId = signedPreKeyId;
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this.signedPreKeyB64 = StringUtils.requireNotNullNorEmpty(signedPreKeyB64, "signedPreKeyB64 MUST NOT be null nor empty.");
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this.signedPreKeySignatureB64 = StringUtils.requireNotNullNorEmpty(signedPreKeySigB64, "signedPreKeySigB64 MUST NOT be null nor empty.");
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this.identityKeyB64 = StringUtils.requireNotNullNorEmpty(identityKeyB64, "identityKeyB64 MUST NOT be null nor empty.");
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if (preKeysB64 == null || preKeysB64.isEmpty()) {
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throw new IllegalArgumentException("PreKeys MUST NOT be null nor empty.");
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}
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this.preKeysB64 = preKeysB64;
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}
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/**
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* Constructor to create a Bundle Element from decoded byte arrays.
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*
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* @param signedPreKeyId id
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* @param signedPreKey signedPreKey
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* @param signedPreKeySig signedPreKeySignature
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* @param identityKey identityKey
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* @param preKeys HashMap of preKeys
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*/
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public OmemoBundleElement(int signedPreKeyId, byte[] signedPreKey, byte[] signedPreKeySig, byte[] identityKey, HashMap<Integer, byte[]> preKeys) {
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this(signedPreKeyId,
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signedPreKey != null ? Base64.encodeToString(signedPreKey) : null,
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signedPreKeySig != null ? Base64.encodeToString(signedPreKeySig) : null,
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identityKey != null ? Base64.encodeToString(identityKey) : null,
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base64EncodePreKeys(preKeys));
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this.signedPreKey = signedPreKey;
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this.signedPreKeySignature = signedPreKeySig;
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this.identityKey = identityKey;
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this.preKeys = preKeys;
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}
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private static HashMap<Integer, String> base64EncodePreKeys(HashMap<Integer, byte[]> preKeys) {
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if (preKeys == null) {
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return null;
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}
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HashMap<Integer, String> converted = new HashMap<>();
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for (Integer id : preKeys.keySet()) {
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converted.put(id, Base64.encodeToString(preKeys.get(id)));
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}
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return converted;
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}
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/**
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* Return the signedPreKey of the OmemoBundleElement.
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*
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* @return signedPreKey as byte array
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*/
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public byte[] getSignedPreKey() {
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if (signedPreKey == null) {
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signedPreKey = Base64.decode(signedPreKeyB64);
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}
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return this.signedPreKey.clone();
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}
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/**
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* Return the id of the signedPreKey in the bundle.
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*
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* @return id of signedPreKey
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*/
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public int getSignedPreKeyId() {
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return this.signedPreKeyId;
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}
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/**
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* Get the signature of the signedPreKey.
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*
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* @return signature as byte array
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*/
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public byte[] getSignedPreKeySignature() {
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if (signedPreKeySignature == null) {
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signedPreKeySignature = Base64.decode(signedPreKeySignatureB64);
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}
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return signedPreKeySignature.clone();
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}
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/**
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* Return the public identityKey of the bundles owner.
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* This can be used to check the signedPreKeys signature.
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* The fingerprint of this key is, what the user has to verify.
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*
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* @return public identityKey as byte array
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*/
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public byte[] getIdentityKey() {
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if (identityKey == null) {
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identityKey = Base64.decode(identityKeyB64);
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}
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return this.identityKey.clone();
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}
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/**
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* Return the HashMap of preKeys in the bundle.
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* The map uses the preKeys ids as key and the preKeys as value.
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*
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* @return preKeys
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*/
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public HashMap<Integer, byte[]> getPreKeys() {
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if (preKeys == null) {
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preKeys = new HashMap<>();
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for (int id : preKeysB64.keySet()) {
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preKeys.put(id, Base64.decode(preKeysB64.get(id)));
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}
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}
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return this.preKeys;
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}
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/**
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* Return a single preKey from the map.
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*
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* @param id id of the preKey
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* @return the preKey
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*/
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public byte[] getPreKey(int id) {
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return getPreKeys().get(id);
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}
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@Override
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public String getElementName() {
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return BUNDLE;
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}
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@Override
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public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
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XmlStringBuilder sb = new XmlStringBuilder(this, enclosingNamespace).rightAngleBracket();
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sb.halfOpenElement(SIGNED_PRE_KEY_PUB).attribute(SIGNED_PRE_KEY_ID, signedPreKeyId).rightAngleBracket()
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.append(signedPreKeyB64).closeElement(SIGNED_PRE_KEY_PUB);
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sb.openElement(SIGNED_PRE_KEY_SIG).append(signedPreKeySignatureB64).closeElement(SIGNED_PRE_KEY_SIG);
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sb.openElement(IDENTITY_KEY).append(identityKeyB64).closeElement(IDENTITY_KEY);
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sb.openElement(PRE_KEYS);
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for (Map.Entry<Integer, String> p : this.preKeysB64.entrySet()) {
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sb.halfOpenElement(PRE_KEY_PUB).attribute(PRE_KEY_ID, p.getKey()).rightAngleBracket()
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.append(p.getValue()).closeElement(PRE_KEY_PUB);
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}
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sb.closeElement(PRE_KEYS);
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sb.closeElement(this);
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return sb;
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}
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@Override
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public String toString() {
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String out = "OmemoBundleElement[\n";
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out += SIGNED_PRE_KEY_PUB + " " + SIGNED_PRE_KEY_ID + "=" + signedPreKeyId + ": " + signedPreKeyB64 + "\n";
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out += SIGNED_PRE_KEY_SIG + ": " + signedPreKeySignatureB64 + "\n";
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out += IDENTITY_KEY + ": " + identityKeyB64 + "\n";
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out += PRE_KEYS + " (" + preKeysB64.size() + ")\n";
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for (Map.Entry<Integer, String> e : preKeysB64.entrySet()) {
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out += PRE_KEY_PUB + " " + PRE_KEY_ID + "=" + e.getKey() + ": " + e.getValue() + "\n";
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}
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return out;
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}
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@Override
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public boolean equals(Object other) {
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if (!(other instanceof OmemoBundleElement)) {
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return false;
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}
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OmemoBundleElement otherOmemoBundleElement = (OmemoBundleElement) other;
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return toXML().toString().equals(otherOmemoBundleElement.toXML().toString());
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}
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@Override
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public int hashCode() {
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return toXML().toString().hashCode();
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}
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}
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