Code cleanup: create new trust management class

5 files changed, 196 insertions, 229 deletions

diff --git a/plugins/omemo/CMakeLists.txt b/plugins/omemo/CMakeLists.txt
index dda85f15..80665efd 100644
--- a/plugins/omemo/CMakeLists.txt
+++ b/plugins/omemo/CMakeLists.txt
@@ -45,6 +45,7 @@ SOURCES
     src/session_store.vala
     src/signed_pre_key_store.vala
     src/stream_module.vala
+    src/trust_manager.vala
     src/util.vala
 CUSTOM_VAPIS
     ${CMAKE_BINARY_DIR}/exports/signal-protocol.vapi
diff --git a/plugins/omemo/src/contact_details_dialog.vala b/plugins/omemo/src/contact_details_dialog.vala
index 70bf1dd7..11bed0c1 100644
--- a/plugins/omemo/src/contact_details_dialog.vala
+++ b/plugins/omemo/src/contact_details_dialog.vala
@@ -37,14 +37,6 @@ public class ContactDetailsDialog : Gtk.Dialog {
                 .with(plugin.db.identity_meta.address_name, "=", device[plugin.db.identity_meta.address_name])
                 .with(plugin.db.identity_meta.device_id, "=", device[plugin.db.identity_meta.device_id])
                 .set(plugin.db.identity_meta.trust_level, trust_level).perform();
-
-        if (!own) {
-            if(!trust) {
-                plugin.app.stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).untrust_device(jid, device[plugin.db.identity_meta.device_id]);
-            } else {
-                plugin.app.stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).trust_device(jid, device[plugin.db.identity_meta.device_id]);
-            }
-        }
     }
 
     private void add_fingerprint(Row device, int row, Database.IdentityMetaTable.TrustLevel trust) {
diff --git a/plugins/omemo/src/manager.vala b/plugins/omemo/src/manager.vala
index aa2a5351..5bd1e00e 100644
--- a/plugins/omemo/src/manager.vala
+++ b/plugins/omemo/src/manager.vala
@@ -12,6 +12,7 @@ public class Manager : StreamInteractionModule, Object {
 
     private StreamInteractor stream_interactor;
     private Database db;
+    private TrustManager trust_manager;
     private Map<Entities.Message, MessageState> message_states = new HashMap<Entities.Message, MessageState>(Entities.Message.hash_func, Entities.Message.equals_func);
     private ReceivedMessageListener received_message_listener = new ReceivedMessageListener();
 
@@ -64,6 +65,8 @@ public class Manager : StreamInteractionModule, Object {
         this.stream_interactor = stream_interactor;
         this.db = db;
 
+        this.trust_manager = new TrustManager(stream_interactor, db);
+
         stream_interactor.stream_negotiated.connect(on_stream_negotiated);
         stream_interactor.account_added.connect(on_account_added);
         stream_interactor.get_module(MessageProcessor.IDENTITY).received_pipeline.connect(received_message_listener);
@@ -85,9 +88,12 @@ public class Manager : StreamInteractionModule, Object {
         }
     }
 
-    private Gee.List<Jid> get_occupants(Jid muc, Account account){
+    private Gee.List<Jid> get_occupants(Jid jid, Account account){
         Gee.List<Jid> occupants = new ArrayList<Jid>(Jid.equals_bare_func);
-        Gee.List<Jid>? occupant_jids = stream_interactor.get_module(MucManager.IDENTITY).get_offline_members(muc, account);
+        if(!stream_interactor.get_module(MucManager.IDENTITY).is_groupchat(jid, account)){
+            occupants.add(jid);
+        }
+        Gee.List<Jid>? occupant_jids = stream_interactor.get_module(MucManager.IDENTITY).get_offline_members(jid, account);
         if(occupant_jids == null) {
             return occupants;
         }
@@ -113,14 +119,6 @@ public class Manager : StreamInteractionModule, Object {
             }
             StreamModule module = (!)module_;
 
-            foreach (Row row in db.identity_meta.with_address(conversation.account.id, conversation.account.bare_jid.to_string())){
-                if(row[db.identity_meta.trust_level] == Database.IdentityMetaTable.TrustLevel.TRUSTED || row[db.identity_meta.trust_level] == Database.IdentityMetaTable.TrustLevel.VERIFIED){
-                    module.trust_device(conversation.account.bare_jid, row[db.identity_meta.device_id]);
-                } else {
-                    module.untrust_device(conversation.account.bare_jid, row[db.identity_meta.device_id]);
-                }
-            }
-
             Gee.List<Jid> recipients;
             if (message_stanza.type_ == MessageStanza.TYPE_GROUPCHAT) {
                 recipients = get_occupants((!)message.to.bare_jid, conversation.account);
@@ -133,7 +131,7 @@ public class Manager : StreamInteractionModule, Object {
                 recipients.add(message_stanza.to);
             }
 
-            EncryptState enc_state = module.encrypt(message_stanza, conversation.account.bare_jid, recipients);
+            EncryptState enc_state = trust_manager.encrypt(message_stanza, conversation.account.bare_jid, recipients, stream, conversation.account);
             MessageState state;
             lock (message_states) {
                 if (message_states.has_key(message)) {
@@ -156,13 +154,17 @@ public class Manager : StreamInteractionModule, Object {
                     if (Plugin.DEBUG) print(@"OMEMO: message will be delayed: $state\n");
 
                     if (state.waiting_own_sessions > 0) {
-                        module.fetch_bundles((!)stream, conversation.account.bare_jid);
+                        module.fetch_bundles((!)stream, conversation.account.bare_jid, trust_manager.get_trusted_devices(conversation.account, conversation.account.bare_jid));
                     }
                     if (state.waiting_other_sessions > 0 && message.counterpart != null) {
-                        module.fetch_bundles((!)stream, ((!)message.counterpart).bare_jid);
+                        foreach(Jid jid in get_occupants(((!)message.counterpart).bare_jid, conversation.account)) {
+                            module.fetch_bundles((!)stream, jid, trust_manager.get_trusted_devices(conversation.account, jid));
+                        }
                     }
                     if (state.waiting_other_devicelists > 0 && message.counterpart != null) {
-                        module.request_user_devicelist((!)stream, ((!)message.counterpart).bare_jid);
+                        foreach(Jid jid in get_occupants(((!)message.counterpart).bare_jid, conversation.account)) {
+                            module.request_user_devicelist((!)stream, jid);
+                        }
                     }
                 }
             }
@@ -171,7 +173,7 @@ public class Manager : StreamInteractionModule, Object {
 
     private void on_account_added(Account account) {
         stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).store_created.connect((store) => on_store_created(account, store));
-        stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).device_list_loaded.connect((jid) => on_device_list_loaded(account, jid));
+        stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).device_list_loaded.connect((jid, devices) => on_device_list_loaded(account, jid, devices));
         stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).bundle_fetched.connect((jid, device_id, bundle) => on_bundle_fetched(account, jid, device_id, bundle));
     }
 
@@ -179,31 +181,8 @@ public class Manager : StreamInteractionModule, Object {
         stream_interactor.module_manager.get_module(account, StreamModule.IDENTITY).request_user_devicelist(stream, account.bare_jid);
     }
 
-    private void on_device_list_loaded(Account account, Jid jid) {
+    private void on_device_list_loaded(Account account, Jid jid, ArrayList<int32> device_list) {
         if (Plugin.DEBUG) print(@"OMEMO: received device list for $(account.bare_jid) from $jid\n");
-        HashSet<Entities.Message> send_now = new HashSet<Entities.Message>();
-        lock (message_states) {
-            foreach (Entities.Message msg in message_states.keys) {
-                if (!msg.account.equals(account)) continue;
-                Gee.List<Jid> occupants = get_occupants(msg.counterpart.bare_jid, account);
-                MessageState state = message_states[msg];
-                if (account.bare_jid.equals(jid)) {
-                    state.waiting_own_devicelist = false;
-                } else if (msg.counterpart != null && (msg.counterpart.equals_bare(jid) || occupants.contains(jid))) {
-                    state.waiting_other_devicelists--;
-                }
-                if (state.should_retry_now()) {
-                    send_now.add(msg);
-                    state.active_send_attempt = true;
-                }
-            }
-        }
-        foreach (Entities.Message msg in send_now) {
-            if (msg.counterpart == null) continue;
-            Entities.Conversation? conv = stream_interactor.get_module(ConversationManager.IDENTITY).get_conversation(((!)msg.counterpart), account);
-            if (conv == null) continue;
-            stream_interactor.get_module(MessageProcessor.IDENTITY).send_xmpp_message(msg, (!)conv, true);
-        }
 
         // Update meta database
         XmppStream? stream = stream_interactor.get_stream(account);
@@ -215,7 +194,6 @@ public class Manager : StreamInteractionModule, Object {
             return;
         }
 
-        ArrayList<int32> device_list = module.get_device_list(jid);
         db.identity_meta.insert_device_list(account.id, jid.bare_jid.to_string(), device_list);
         int inc = 0;
         foreach (Row row in db.identity_meta.with_address(account.id, jid.bare_jid.to_string()).with_null(db.identity_meta.identity_key_public_base64)) {
@@ -229,6 +207,31 @@ public class Manager : StreamInteractionModule, Object {
         if (db.trust.select().with(db.trust.identity_id, "=", account.id).with(db.trust.address_name, "=", jid.bare_jid.to_string()).count() == 0) {
             db.trust.insert().value(db.trust.identity_id, account.id).value(db.trust.address_name, jid.bare_jid.to_string()).value(db.trust.blind_trust, true).perform();
         }
+
+        HashSet<Entities.Message> send_now = new HashSet<Entities.Message>();
+        lock (message_states) {
+            foreach (Entities.Message msg in message_states.keys) {
+                if (!msg.account.equals(account)) continue;
+                Gee.List<Jid> occupants = get_occupants(msg.counterpart.bare_jid, account);
+                MessageState state = message_states[msg];
+                if (account.bare_jid.equals(jid)) {
+                    state.waiting_own_devicelist = false;
+                } else if (msg.counterpart != null && occupants.contains(jid)) {
+                    state.waiting_other_devicelists--;
+                }
+                if (state.should_retry_now()) {
+                    send_now.add(msg);
+                    state.active_send_attempt = true;
+                }
+            }
+        }
+        foreach (Entities.Message msg in send_now) {
+            if (msg.counterpart == null) continue;
+            Entities.Conversation? conv = stream_interactor.get_module(ConversationManager.IDENTITY).get_conversation(((!)msg.counterpart), account);
+            if (conv == null) continue;
+            stream_interactor.get_module(MessageProcessor.IDENTITY).send_xmpp_message(msg, (!)conv, true);
+        }
+
     }
 
     public void on_bundle_fetched(Account account, Jid jid, int32 device_id, Bundle bundle) {
@@ -264,9 +267,7 @@ public class Manager : StreamInteractionModule, Object {
 
                 MessageState state = message_states[msg];
 
-                if (trusted != Database.IdentityMetaTable.TrustLevel.TRUSTED && trusted != Database.IdentityMetaTable.TrustLevel.VERIFIED) {
-                    module.untrust_device(jid, device_id);
-                } else {
+                if (trusted == Database.IdentityMetaTable.TrustLevel.TRUSTED || trusted == Database.IdentityMetaTable.TrustLevel.VERIFIED) {
                     if(account.bare_jid.equals(jid) || (msg.counterpart != null && (msg.counterpart.equals_bare(jid) || occupants.contains(jid)))) {
                         session_created = module.start_session(stream, jid, device_id, bundle);
                     }
@@ -339,14 +340,14 @@ public class Manager : StreamInteractionModule, Object {
             if (flag == null) return false;
             if (flag.has_room_feature(conversation.counterpart, Xep.Muc.Feature.NON_ANONYMOUS) && flag.has_room_feature(conversation.counterpart, Xep.Muc.Feature.MEMBERS_ONLY)) {
                 foreach(Jid jid in stream_interactor.get_module(MucManager.IDENTITY).get_offline_members(conversation.counterpart, conversation.account)) {
-                    if (!((!)module).is_known_address(jid.bare_jid)) return false;
+                    if (!trust_manager.is_known_address(conversation.account, jid.bare_jid)) return false;
                 }
                 return true;
             } else {
                 return false;
             }
         } else {
-            return ((!)module).is_known_address(conversation.counterpart.bare_jid);
+            return trust_manager.is_known_address(conversation.account, conversation.counterpart.bare_jid);
         }
     }
 
diff --git a/plugins/omemo/src/stream_module.vala b/plugins/omemo/src/stream_module.vala
index 13406738..d298db2b 100644
--- a/plugins/omemo/src/stream_module.vala
+++ b/plugins/omemo/src/stream_module.vala
@@ -16,137 +16,16 @@ private const int NUM_KEYS_TO_PUBLISH = 100;
 public class StreamModule : XmppStreamModule {
     public static Xmpp.ModuleIdentity<StreamModule> IDENTITY = new Xmpp.ModuleIdentity<StreamModule>(NS_URI, "omemo_module");
 
-    private Store store;
+    public Store store { public get; private set; }
     private ConcurrentSet<string> active_bundle_requests = new ConcurrentSet<string>();
     private ConcurrentSet<Jid> active_devicelist_requests = new ConcurrentSet<Jid>();
-    private Map<Jid, ArrayList<int32>> device_lists = new HashMap<Jid, ArrayList<int32>>(Jid.hash_bare_func, Jid.equals_bare_func);
     private Map<Jid, ArrayList<int32>> ignored_devices = new HashMap<Jid, ArrayList<int32>>(Jid.hash_bare_func, Jid.equals_bare_func);
-    private Map<Jid, Gee.List<Jid>> occupants = new HashMap<Jid, ArrayList<Jid>>(Jid.hash_bare_func, Jid.equals_bare_func);
     private ReceivedPipelineListener received_pipeline_listener;
 
     public signal void store_created(Store store);
-    public signal void device_list_loaded(Jid jid);
+    public signal void device_list_loaded(Jid jid, ArrayList<int32> devices);
     public signal void bundle_fetched(Jid jid, int device_id, Bundle bundle);
 
-    public EncryptState encrypt(MessageStanza message, Jid self_jid, Gee.List<Jid> recipients) {
-        EncryptState status = new EncryptState();
-        if (!Plugin.ensure_context()) return status;
-        if (message.to == null) return status;
-
-        if(message.type_ == MessageStanza.TYPE_GROUPCHAT) {
-            occupants[message.to] = recipients;
-        }
-
-        try {
-            if (!device_lists.has_key(self_jid)) return status;
-            status.own_list = true;
-            status.own_devices = device_lists.get(self_jid).size;
-            status.other_waiting_lists = 0;
-            status.other_devices = 0;
-            foreach (Jid recipient in recipients) {
-                if (!device_lists.has_key(recipient)) {
-                    status.other_waiting_lists++;
-                    return status;
-                }
-                status.other_devices += device_lists.get(recipient).size;
-            }
-            if (status.own_devices == 0 || status.other_devices == 0) return status;
-
-            uint8[] key = new uint8[16];
-            Plugin.get_context().randomize(key);
-            uint8[] iv = new uint8[16];
-            Plugin.get_context().randomize(iv);
-
-            uint8[] ciphertext = aes_encrypt(Cipher.AES_GCM_NOPADDING, key, iv, message.body.data);
-
-            StanzaNode header;
-            StanzaNode encrypted = new StanzaNode.build("encrypted", NS_URI).add_self_xmlns()
-                    .put_node(header = new StanzaNode.build("header", NS_URI)
-                        .put_attribute("sid", store.local_registration_id.to_string())
-                        .put_node(new StanzaNode.build("iv", NS_URI)
-                            .put_node(new StanzaNode.text(Base64.encode(iv)))))
-                    .put_node(new StanzaNode.build("payload", NS_URI)
-                        .put_node(new StanzaNode.text(Base64.encode(ciphertext))));
-
-            Address address = new Address(message.to.bare_jid.to_string(), 0);
-            foreach (Jid recipient in recipients) {
-                foreach(int32 device_id in device_lists[recipient]) {
-                    if (is_ignored_device(recipient, device_id)) {
-                        status.other_lost++;
-                        continue;
-                    }
-                    try {
-                        address.name = recipient.bare_jid.to_string();
-                        address.device_id = (int) device_id;
-                        StanzaNode key_node = create_encrypted_key(key, address);
-                        header.put_node(key_node);
-                        status.other_success++;
-                    } catch (Error e) {
-                        if (e.code == ErrorCode.UNKNOWN) status.other_unknown++;
-                        else status.other_failure++;
-                    }
-                }
-            }
-            address.name = self_jid.bare_jid.to_string();
-            foreach(int32 device_id in device_lists[self_jid]) {
-                if (is_ignored_device(self_jid, device_id)) {
-                    status.own_lost++;
-                    continue;
-                }
-                if (device_id != store.local_registration_id) {
-                    address.device_id = (int) device_id;
-                    try {
-                        StanzaNode key_node = create_encrypted_key(key, address);
-                        header.put_node(key_node);
-                        status.own_success++;
-                    } catch (Error e) {
-                        if (e.code == ErrorCode.UNKNOWN) status.own_unknown++;
-                        else status.own_failure++;
-                    }
-                }
-            }
-
-            message.stanza.put_node(encrypted);
-            Xep.ExplicitEncryption.add_encryption_tag_to_message(message, NS_URI, "OMEMO");
-            message.body = "[This message is OMEMO encrypted]";
-            status.encrypted = true;
-        } catch (Error e) {
-            if (Plugin.DEBUG) print(@"OMEMO: Signal error while encrypting message: $(e.message)\n");
-        }
-        return status;
-    }
-
-    public void untrust_device(Jid jid, int device_id) {
-        if (device_lists.has_key(jid) && device_lists[jid].contains(device_id)) {
-            device_lists[jid].remove(device_id);
-        }
-        if (store.contains_session(new Address(jid.bare_jid.to_string(), device_id))) {
-            store.delete_session(new Address(jid.bare_jid.to_string(), device_id));
-        }
-    }
-
-    public void trust_device(Jid jid, int device_id) {
-        if (is_ignored_device(jid, device_id)){
-            ignored_devices[jid].remove(device_id);
-        }
-        if (!device_lists.has_key(jid)) {
-            device_lists[jid] = new ArrayList<int32>();
-        }
-        if (!device_lists[jid].contains(device_id)) {
-            device_lists[jid].add(device_id);
-        }
-    }
-
-    private StanzaNode create_encrypted_key(uint8[] key, Address address) throws GLib.Error {
-        SessionCipher cipher = store.create_session_cipher(address);
-        CiphertextMessage device_key = cipher.encrypt(key);
-        StanzaNode key_node = new StanzaNode.build("key", NS_URI)
-            .put_attribute("rid", address.device_id.to_string())
-            .put_node(new StanzaNode.text(Base64.encode(device_key.serialized)));
-        if (device_key.type == CiphertextType.PREKEY) key_node.put_attribute("prekey", "true");
-        return key_node;
-    }
-
     public override void attach(XmppStream stream) {
         if (!Plugin.ensure_context()) return;
 
@@ -162,18 +41,9 @@ public class StreamModule : XmppStreamModule {
     }
 
     public void request_user_devicelist(XmppStream stream, Jid jid) {
-        Gee.List<Jid> recipients;
-        if (occupants.contains(jid)) {
-            recipients = occupants.get(jid);
-        } else {
-            recipients = new ArrayList<Jid>(Jid.equals_bare_func);
-            recipients.add(jid);
-        }
-        foreach (Jid recipient in recipients) {
-            if (active_devicelist_requests.add(recipient)) {
-                if (Plugin.DEBUG) print(@"OMEMO: requesting device list for $jid\n");
-                stream.get_module(Pubsub.Module.IDENTITY).request(stream, recipient, NODE_DEVICELIST, (stream, jid, id, node) => on_devicelist(stream, jid, id, node));
-            }
+        if (active_devicelist_requests.add(jid)) {
+            if (Plugin.DEBUG) print(@"OMEMO: requesting device list for $jid\n");
+            stream.get_module(Pubsub.Module.IDENTITY).request(stream, jid, NODE_DEVICELIST, (stream, jid, id, node) => on_devicelist(stream, jid, id, node));
         }
     }
 
@@ -197,43 +67,30 @@ public class StreamModule : XmppStreamModule {
                 publish_bundles_if_needed(stream, jid);
             }
         }
-        lock(device_lists) {
-            device_lists[jid] = new ArrayList<int32>();
-            foreach (StanzaNode device_node in node.get_subnodes("device")) {
-                device_lists[jid].add(device_node.get_attribute_int("id"));
-            }
+
+        ArrayList<int32> device_list = new ArrayList<int32>();
+        foreach (StanzaNode device_node in node.get_subnodes("device")) {
+            device_list.add(device_node.get_attribute_int("id"));
         }
         active_devicelist_requests.remove(jid);
-        device_list_loaded(jid);
+        device_list_loaded(jid, device_list);
     }
 
-    public void fetch_bundles(XmppStream stream, Jid jid) {
-        Gee.List<Jid> recipients;
-        if (occupants.contains(jid)) {
-            recipients = occupants.get(jid);
-        } else {
-            recipients = new ArrayList<Jid>(Jid.equals_bare_func);
-            recipients.add(jid);
-        }
-        foreach (Jid recipient in recipients) {
-            if (!device_lists.has_key(recipient)) {
-                return;
-            }
-            Address address = new Address(recipient.bare_jid.to_string(), 0);
-            foreach(int32 device_id in device_lists[recipient]) {
-                if (!is_ignored_device(recipient, device_id)) {
-                    address.device_id = device_id;
-                    try {
-                        if (!store.contains_session(address)) {
-                            fetch_bundle(stream, recipient, device_id);
-                        }
-                    } catch (Error e) {
-                        // Ignore
+    public void fetch_bundles(XmppStream stream, Jid jid, Gee.List<int32> devices) {
+        Address address = new Address(jid.bare_jid.to_string(), 0);
+        foreach(int32 device_id in devices) {
+            if (!is_ignored_device(jid, device_id)) {
+                address.device_id = device_id;
+                try {
+                    if (!store.contains_session(address)) {
+                        fetch_bundle(stream, jid, device_id);
                     }
+                } catch (Error e) {
+                    // Ignore
                 }
             }
-            address.device_id = 0;
         }
+        address.device_id = 0;
     }
 
     public void fetch_bundle(XmppStream stream, Jid jid, int device_id) {
@@ -245,18 +102,6 @@ public class StreamModule : XmppStreamModule {
         }
     }
 
-    public ArrayList<int32> get_device_list(Jid jid) {
-        if (is_known_address(jid)) {
-            return device_lists[jid];
-        } else {
-            return new ArrayList<int32>();
-        }
-    }
-
-    public bool is_known_address(Jid jid) {
-        return device_lists.has_key(jid);
-    }
-
     public void ignore_device(Jid jid, int32 device_id) {
         if (device_id <= 0) return;
         lock (ignored_devices) {
diff --git a/plugins/omemo/src/trust_manager.vala b/plugins/omemo/src/trust_manager.vala
new file mode 100644
index 00000000..408faed8
--- /dev/null
+++ b/plugins/omemo/src/trust_manager.vala
@@ -0,0 +1,128 @@
+using Dino.Entities;
+using Gee;
+using Xmpp;
+using Signal;
+using Qlite;
+
+namespace Dino.Plugins.Omemo {
+
+public class TrustManager {
+
+    private StreamInteractor stream_interactor;
+    private Database db;
+
+    public TrustManager(StreamInteractor stream_interactor, Database db) {
+        this.stream_interactor = stream_interactor;
+        this.db = db;
+    }
+
+    private StanzaNode create_encrypted_key(uint8[] key, Address address, Store store) throws GLib.Error {
+        SessionCipher cipher = store.create_session_cipher(address);
+        CiphertextMessage device_key = cipher.encrypt(key);
+        StanzaNode key_node = new StanzaNode.build("key", NS_URI)
+            .put_attribute("rid", address.device_id.to_string())
+            .put_node(new StanzaNode.text(Base64.encode(device_key.serialized)));
+        if (device_key.type == CiphertextType.PREKEY) key_node.put_attribute("prekey", "true");
+        return key_node;
+    }
+
+    public EncryptState encrypt(MessageStanza message, Jid self_jid, Gee.List<Jid> recipients, XmppStream stream, Account account) {
+        EncryptState status = new EncryptState();
+        if (!Plugin.ensure_context()) return status;
+        if (message.to == null) return status;
+
+        StreamModule module = stream.get_module(StreamModule.IDENTITY);
+
+        try {
+            if (!is_known_address(account, self_jid)) return status;
+            status.own_list = true;
+            status.own_devices = get_trusted_devices(account, self_jid).size;
+            status.other_waiting_lists = 0;
+            status.other_devices = 0;
+            foreach (Jid recipient in recipients) {
+                if (!is_known_address(account, recipient)) {
+                    status.other_waiting_lists++;
+                    return status;
+                }
+                status.other_devices += get_trusted_devices(account, recipient).size;
+            }
+            if (status.own_devices == 0 || status.other_devices == 0) return status;
+
+            uint8[] key = new uint8[16];
+            Plugin.get_context().randomize(key);
+            uint8[] iv = new uint8[16];
+            Plugin.get_context().randomize(iv);
+
+            uint8[] ciphertext = aes_encrypt(Cipher.AES_GCM_NOPADDING, key, iv, message.body.data);
+
+            StanzaNode header;
+            StanzaNode encrypted = new StanzaNode.build("encrypted", NS_URI).add_self_xmlns()
+                    .put_node(header = new StanzaNode.build("header", NS_URI)
+                        .put_attribute("sid", module.store.local_registration_id.to_string())
+                        .put_node(new StanzaNode.build("iv", NS_URI)
+                            .put_node(new StanzaNode.text(Base64.encode(iv)))))
+                    .put_node(new StanzaNode.build("payload", NS_URI)
+                        .put_node(new StanzaNode.text(Base64.encode(ciphertext))));
+
+            Address address = new Address(message.to.bare_jid.to_string(), 0);
+            foreach (Jid recipient in recipients) {
+                foreach(int32 device_id in get_trusted_devices(account, recipient)) {
+                    if (module.is_ignored_device(recipient, device_id)) {
+                        status.other_lost++;
+                        continue;
+                    }
+                    try {
+                        address.name = recipient.bare_jid.to_string();
+                        address.device_id = (int) device_id;
+                        StanzaNode key_node = create_encrypted_key(key, address, module.store);
+                        header.put_node(key_node);
+                        status.other_success++;
+                    } catch (Error e) {
+                        if (e.code == ErrorCode.UNKNOWN) status.other_unknown++;
+                        else status.other_failure++;
+                    }
+                }
+            }
+            address.name = self_jid.bare_jid.to_string();
+            foreach(int32 device_id in get_trusted_devices(account, self_jid)) {
+                if (module.is_ignored_device(self_jid, device_id)) {
+                    status.own_lost++;
+                    continue;
+                }
+                if (device_id != module.store.local_registration_id) {
+                    address.device_id = (int) device_id;
+                    try {
+                        StanzaNode key_node = create_encrypted_key(key, address, module.store);
+                        header.put_node(key_node);
+                        status.own_success++;
+                    } catch (Error e) {
+                        if (e.code == ErrorCode.UNKNOWN) status.own_unknown++;
+                        else status.own_failure++;
+                    }
+                }
+            }
+
+            message.stanza.put_node(encrypted);
+            Xep.ExplicitEncryption.add_encryption_tag_to_message(message, NS_URI, "OMEMO");
+            message.body = "[This message is OMEMO encrypted]";
+            status.encrypted = true;
+        } catch (Error e) {
+            if (Plugin.DEBUG) print(@"OMEMO: Signal error while encrypting message: $(e.message)\n");
+        }
+        return status;
+    }
+
+    public bool is_known_address(Account account, Jid jid) {
+        return db.identity_meta.with_address(account.id, jid.to_string()).count() > 0;
+    }
+
+    public Gee.List<int32> get_trusted_devices(Account account, Jid jid) {
+        Gee.List<int32> devices = new ArrayList<int32>();
+        foreach (Row device in db.identity_meta.with_address(account.id, jid.to_string()).with(db.identity_meta.trust_level, "!=", Database.IdentityMetaTable.TrustLevel.UNKNOWN).with(db.identity_meta.trust_level, "!=", Database.IdentityMetaTable.TrustLevel.UNTRUSTED).without_null(db.identity_meta.identity_key_public_base64)) {
+            devices.add(device[db.identity_meta.device_id]);
+        }
+        return devices;
+    }
+}
+
+}