2014-02-28 12:46:01 -05:00
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package eu.siacs.conversations.crypto;
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2014-02-13 17:40:08 -05:00
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import java.math.BigInteger;
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import java.security.KeyFactory;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.security.NoSuchAlgorithmException;
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import java.security.PrivateKey;
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import java.security.PublicKey;
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import java.security.spec.DSAPrivateKeySpec;
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import java.security.spec.DSAPublicKeySpec;
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import java.security.spec.InvalidKeySpecException;
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import org.json.JSONException;
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import org.json.JSONObject;
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import android.content.Context;
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import android.util.Log;
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2014-02-28 12:46:01 -05:00
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import eu.siacs.conversations.entities.Account;
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import eu.siacs.conversations.persistance.DatabaseBackend;
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2014-03-10 14:22:13 -04:00
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import eu.siacs.conversations.xmpp.stanzas.MessagePacket;
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2014-02-13 17:40:08 -05:00
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import net.java.otr4j.OtrEngineHost;
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import net.java.otr4j.OtrException;
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import net.java.otr4j.OtrPolicy;
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import net.java.otr4j.OtrPolicyImpl;
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import net.java.otr4j.session.InstanceTag;
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import net.java.otr4j.session.SessionID;
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public class OtrEngine implements OtrEngineHost {
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private static final String LOGTAG = "xmppService";
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private Account account;
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private OtrPolicy otrPolicy;
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private KeyPair keyPair;
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private Context context;
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public OtrEngine(Context context, Account account) {
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this.account = account;
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this.otrPolicy = new OtrPolicyImpl();
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this.otrPolicy.setAllowV1(false);
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this.otrPolicy.setAllowV2(true);
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this.otrPolicy.setAllowV3(true);
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this.keyPair = loadKey(account.getKeys());
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}
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private KeyPair loadKey(JSONObject keys) {
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if (keys == null) {
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return null;
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}
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try {
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BigInteger x = new BigInteger(keys.getString("otr_x"),16);
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BigInteger y = new BigInteger(keys.getString("otr_y"),16);
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BigInteger p = new BigInteger(keys.getString("otr_p"),16);
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BigInteger q = new BigInteger(keys.getString("otr_q"),16);
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BigInteger g = new BigInteger(keys.getString("otr_g"),16);
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KeyFactory keyFactory = KeyFactory.getInstance("DSA");
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DSAPublicKeySpec pubKeySpec = new DSAPublicKeySpec(y, p, q, g);
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DSAPrivateKeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
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PublicKey publicKey = keyFactory.generatePublic(pubKeySpec);
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PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
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return new KeyPair(publicKey, privateKey);
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} catch (JSONException e) {
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2014-03-08 14:14:47 -05:00
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return null;
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2014-02-13 17:40:08 -05:00
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} catch (NoSuchAlgorithmException e) {
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2014-03-08 14:14:47 -05:00
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return null;
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2014-02-13 17:40:08 -05:00
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} catch (InvalidKeySpecException e) {
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2014-03-08 14:14:47 -05:00
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return null;
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2014-02-13 17:40:08 -05:00
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}
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}
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private void saveKey() {
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PublicKey publicKey = keyPair.getPublic();
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PrivateKey privateKey = keyPair.getPrivate();
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KeyFactory keyFactory;
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try {
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keyFactory = KeyFactory.getInstance("DSA");
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DSAPrivateKeySpec privateKeySpec = keyFactory.getKeySpec(privateKey, DSAPrivateKeySpec.class);
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DSAPublicKeySpec publicKeySpec = keyFactory.getKeySpec(publicKey, DSAPublicKeySpec.class);
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this.account.setKey("otr_x",privateKeySpec.getX().toString(16));
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this.account.setKey("otr_g",privateKeySpec.getG().toString(16));
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this.account.setKey("otr_p",privateKeySpec.getP().toString(16));
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this.account.setKey("otr_q",privateKeySpec.getQ().toString(16));
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this.account.setKey("otr_y",publicKeySpec.getY().toString(16));
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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} catch (InvalidKeySpecException e) {
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e.printStackTrace();
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}
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}
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@Override
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public void askForSecret(SessionID arg0, InstanceTag arg1, String arg2) {
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// TODO Auto-generated method stub
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}
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@Override
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public void finishedSessionMessage(SessionID arg0, String arg1)
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throws OtrException {
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// TODO Auto-generated method stub
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}
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@Override
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public String getFallbackMessage(SessionID arg0) {
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// TODO Auto-generated method stub
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return null;
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}
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@Override
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public byte[] getLocalFingerprintRaw(SessionID arg0) {
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// TODO Auto-generated method stub
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return null;
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}
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2014-02-16 10:32:15 -05:00
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public PublicKey getPublicKey() {
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2014-03-14 16:36:38 -04:00
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if (this.keyPair == null) {
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return null;
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}
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2014-02-16 10:32:15 -05:00
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return this.keyPair.getPublic();
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}
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2014-02-13 17:40:08 -05:00
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@Override
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public KeyPair getLocalKeyPair(SessionID arg0) throws OtrException {
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if (this.keyPair==null) {
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KeyPairGenerator kg;
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try {
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kg = KeyPairGenerator.getInstance("DSA");
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this.keyPair = kg.genKeyPair();
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this.saveKey();
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DatabaseBackend.getInstance(context).updateAccount(account);
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} catch (NoSuchAlgorithmException e) {
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Log.d(LOGTAG,"error generating key pair "+e.getMessage());
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}
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}
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return this.keyPair;
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}
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@Override
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public String getReplyForUnreadableMessage(SessionID arg0) {
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// TODO Auto-generated method stub
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return null;
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}
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@Override
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public OtrPolicy getSessionPolicy(SessionID arg0) {
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return otrPolicy;
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}
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@Override
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public void injectMessage(SessionID session, String body) throws OtrException {
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MessagePacket packet = new MessagePacket();
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packet.setFrom(account.getFullJid()); //sender
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packet.setTo(session.getAccountID()+"/"+session.getUserID()); //reciepient
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packet.setBody(body);
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2014-03-20 10:49:53 -04:00
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packet.addChild("private","urn:xmpp:carbons:2");
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packet.addChild("no-copy","urn:xmpp:hints");
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2014-02-22 12:18:51 -05:00
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packet.setType(MessagePacket.TYPE_CHAT);
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2014-03-21 09:58:33 -04:00
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//Log.d(LOGTAG,packet.toString());
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2014-02-13 17:40:08 -05:00
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account.getXmppConnection().sendMessagePacket(packet);
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}
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@Override
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public void messageFromAnotherInstanceReceived(SessionID arg0) {
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// TODO Auto-generated method stub
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}
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@Override
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public void multipleInstancesDetected(SessionID arg0) {
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// TODO Auto-generated method stub
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}
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@Override
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public void requireEncryptedMessage(SessionID arg0, String arg1)
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throws OtrException {
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// TODO Auto-generated method stub
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}
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@Override
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public void showError(SessionID arg0, String arg1) throws OtrException {
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// TODO Auto-generated method stub
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}
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@Override
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public void smpAborted(SessionID arg0) throws OtrException {
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// TODO Auto-generated method stub
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}
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@Override
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public void smpError(SessionID arg0, int arg1, boolean arg2)
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throws OtrException {
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2014-03-23 09:15:14 -04:00
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throw new OtrException(new Exception("smp error"));
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2014-02-13 17:40:08 -05:00
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}
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@Override
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public void unencryptedMessageReceived(SessionID arg0, String arg1)
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throws OtrException {
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2014-03-23 09:15:14 -04:00
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throw new OtrException(new Exception("unencrypted message received"));
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2014-02-13 17:40:08 -05:00
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}
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@Override
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public void unreadableMessageReceived(SessionID arg0) throws OtrException {
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2014-03-12 22:52:41 -04:00
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throw new OtrException(new Exception("unreadable message received"));
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2014-02-13 17:40:08 -05:00
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}
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@Override
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public void unverify(SessionID arg0, String arg1) {
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// TODO Auto-generated method stub
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}
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@Override
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public void verify(SessionID arg0, String arg1, boolean arg2) {
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// TODO Auto-generated method stub
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}
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}
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