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-rw-r--r--src/de/gultsch/chat/crypto/OtrEngine.java229
1 files changed, 229 insertions, 0 deletions
diff --git a/src/de/gultsch/chat/crypto/OtrEngine.java b/src/de/gultsch/chat/crypto/OtrEngine.java
new file mode 100644
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--- /dev/null
+++ b/src/de/gultsch/chat/crypto/OtrEngine.java
@@ -0,0 +1,229 @@
+package de.gultsch.chat.crypto;
+
+import java.math.BigInteger;
+import java.security.KeyFactory;
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.spec.DSAPrivateKeySpec;
+import java.security.spec.DSAPublicKeySpec;
+import java.security.spec.InvalidKeySpecException;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import android.content.Context;
+import android.util.Log;
+
+import de.gultsch.chat.entities.Account;
+import de.gultsch.chat.persistance.DatabaseBackend;
+import de.gultsch.chat.xml.Element;
+import de.gultsch.chat.xmpp.MessagePacket;
+
+import net.java.otr4j.OtrEngineHost;
+import net.java.otr4j.OtrException;
+import net.java.otr4j.OtrPolicy;
+import net.java.otr4j.OtrPolicyImpl;
+import net.java.otr4j.session.InstanceTag;
+import net.java.otr4j.session.SessionID;
+
+public class OtrEngine implements OtrEngineHost {
+
+ private static final String LOGTAG = "xmppService";
+
+ private Account account;
+ private OtrPolicy otrPolicy;
+ private KeyPair keyPair;
+ private Context context;
+
+ public OtrEngine(Context context, Account account) {
+ this.account = account;
+ this.otrPolicy = new OtrPolicyImpl();
+ this.otrPolicy.setAllowV1(false);
+ this.otrPolicy.setAllowV2(true);
+ this.otrPolicy.setAllowV3(true);
+ this.keyPair = loadKey(account.getKeys());
+ }
+
+ private KeyPair loadKey(JSONObject keys) {
+ if (keys == null) {
+ return null;
+ }
+ try {
+ BigInteger x = new BigInteger(keys.getString("otr_x"),16);
+ BigInteger y = new BigInteger(keys.getString("otr_y"),16);
+ BigInteger p = new BigInteger(keys.getString("otr_p"),16);
+ BigInteger q = new BigInteger(keys.getString("otr_q"),16);
+ BigInteger g = new BigInteger(keys.getString("otr_g"),16);
+ KeyFactory keyFactory = KeyFactory.getInstance("DSA");
+ DSAPublicKeySpec pubKeySpec = new DSAPublicKeySpec(y, p, q, g);
+ DSAPrivateKeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
+ PublicKey publicKey = keyFactory.generatePublic(pubKeySpec);
+ PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec);
+ return new KeyPair(publicKey, privateKey);
+ } catch (JSONException e) {
+ // TODO Auto-generated catch block
+ e.printStackTrace();
+ } catch (NoSuchAlgorithmException e) {
+ // TODO Auto-generated catch block
+ e.printStackTrace();
+ } catch (InvalidKeySpecException e) {
+ // TODO Auto-generated catch block
+ e.printStackTrace();
+ }
+ return null;
+ }
+
+ private void saveKey() {
+ PublicKey publicKey = keyPair.getPublic();
+ PrivateKey privateKey = keyPair.getPrivate();
+ KeyFactory keyFactory;
+ try {
+ keyFactory = KeyFactory.getInstance("DSA");
+ DSAPrivateKeySpec privateKeySpec = keyFactory.getKeySpec(privateKey, DSAPrivateKeySpec.class);
+ DSAPublicKeySpec publicKeySpec = keyFactory.getKeySpec(publicKey, DSAPublicKeySpec.class);
+ this.account.setKey("otr_x",privateKeySpec.getX().toString(16));
+ this.account.setKey("otr_g",privateKeySpec.getG().toString(16));
+ this.account.setKey("otr_p",privateKeySpec.getP().toString(16));
+ this.account.setKey("otr_q",privateKeySpec.getQ().toString(16));
+ this.account.setKey("otr_y",publicKeySpec.getY().toString(16));
+ } catch (NoSuchAlgorithmException e) {
+ e.printStackTrace();
+ } catch (InvalidKeySpecException e) {
+ e.printStackTrace();
+ } catch (JSONException e) {
+ e.printStackTrace();
+ }
+
+ }
+
+ @Override
+ public void askForSecret(SessionID arg0, InstanceTag arg1, String arg2) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void finishedSessionMessage(SessionID arg0, String arg1)
+ throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public String getFallbackMessage(SessionID arg0) {
+ // TODO Auto-generated method stub
+ return null;
+ }
+
+ @Override
+ public byte[] getLocalFingerprintRaw(SessionID arg0) {
+ // TODO Auto-generated method stub
+ return null;
+ }
+
+ @Override
+ public KeyPair getLocalKeyPair(SessionID arg0) throws OtrException {
+ if (this.keyPair==null) {
+ KeyPairGenerator kg;
+ try {
+ kg = KeyPairGenerator.getInstance("DSA");
+ this.keyPair = kg.genKeyPair();
+ this.saveKey();
+ DatabaseBackend.getInstance(context).updateAccount(account);
+ } catch (NoSuchAlgorithmException e) {
+ Log.d(LOGTAG,"error generating key pair "+e.getMessage());
+ }
+ }
+ return this.keyPair;
+ }
+
+ @Override
+ public String getReplyForUnreadableMessage(SessionID arg0) {
+ // TODO Auto-generated method stub
+ return null;
+ }
+
+ @Override
+ public OtrPolicy getSessionPolicy(SessionID arg0) {
+ return otrPolicy;
+ }
+
+ @Override
+ public void injectMessage(SessionID session, String body) throws OtrException {
+ MessagePacket packet = new MessagePacket();
+ packet.setFrom(account.getFullJid()); //sender
+ packet.setTo(session.getAccountID()+"/"+session.getUserID()); //reciepient
+ packet.setBody(body);
+ Element privateTag = new Element("private");
+ privateTag.setAttribute("xmlns","urn:xmpp:carbons:2");
+ packet.addChild(privateTag);
+ account.getXmppConnection().sendMessagePacket(packet);
+ }
+
+ @Override
+ public void messageFromAnotherInstanceReceived(SessionID arg0) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void multipleInstancesDetected(SessionID arg0) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void requireEncryptedMessage(SessionID arg0, String arg1)
+ throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void showError(SessionID arg0, String arg1) throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void smpAborted(SessionID arg0) throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void smpError(SessionID arg0, int arg1, boolean arg2)
+ throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void unencryptedMessageReceived(SessionID arg0, String arg1)
+ throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void unreadableMessageReceived(SessionID arg0) throws OtrException {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void unverify(SessionID arg0, String arg1) {
+ // TODO Auto-generated method stub
+
+ }
+
+ @Override
+ public void verify(SessionID arg0, String arg1, boolean arg2) {
+ // TODO Auto-generated method stub
+
+ }
+
+}