From 5e561f410a90fe1de532b9a054554e877782f311 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Thu, 24 Oct 2024 17:47:20 +0200
Subject: [PATCH] Migrate from libsignal-protocol-java to libsignal

---
 smack-omemo-signal/build.gradle               |  2 +-
 .../omemo/signal/SignalCachingOmemoStore.java | 18 ++---
 .../signal/SignalFileBasedOmemoStore.java     | 18 ++---
 .../omemo/signal/SignalOmemoKeyUtil.java      | 79 +++++++++++++------
 .../omemo/signal/SignalOmemoRatchet.java      | 53 +++++++------
 .../omemo/signal/SignalOmemoService.java      | 26 +++---
 .../smackx/omemo/signal/SignalOmemoStore.java | 18 ++---
 .../signal/SignalOmemoStoreConnector.java     | 35 ++++----
 .../omemo/LegacySignalOmemoKeyUtilTest.java   |  6 +-
 .../smackx/omemo/SignalOmemoKeyUtilTest.java  | 14 ++--
 .../smackx/omemo/SignalOmemoStoreTest.java    | 18 ++---
 11 files changed, 170 insertions(+), 117 deletions(-)

diff --git a/smack-omemo-signal/build.gradle b/smack-omemo-signal/build.gradle
index aa0887f94..dd5fd4602 100644
--- a/smack-omemo-signal/build.gradle
+++ b/smack-omemo-signal/build.gradle
@@ -11,7 +11,7 @@ dependencies {
 	api project(":smack-im")
 	api project(":smack-extensions")
 	api project(":smack-omemo")
-	implementation 'org.whispersystems:signal-protocol-java:2.8.1'
+	implementation 'org.signal:libsignal-client:0.26.0'
 
 	// TODO: Migrate Junit4 tests to Junit5.
 	testImplementation "org.junit.vintage:junit-vintage-engine:$junitVersion"
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalCachingOmemoStore.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalCachingOmemoStore.java
index 135bd96fb..eafd0fb2d 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalCachingOmemoStore.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalCachingOmemoStore.java
@@ -23,15 +23,15 @@ package org.jivesoftware.smackx.omemo.signal;
 import org.jivesoftware.smackx.omemo.CachingOmemoStore;
 import org.jivesoftware.smackx.omemo.OmemoStore;
 
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
 
 /**
  * Implementation of the CachingOmemoStore for smack-omemo-signal.
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalFileBasedOmemoStore.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalFileBasedOmemoStore.java
index f474b9b19..9cce37dfb 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalFileBasedOmemoStore.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalFileBasedOmemoStore.java
@@ -25,15 +25,15 @@ import java.io.File;
 import org.jivesoftware.smackx.omemo.FileBasedOmemoStore;
 import org.jivesoftware.smackx.omemo.util.OmemoKeyUtil;
 
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
 
 /**
  * Implementation of a FileBasedOmemoStore for the smack-omemo-signal module.
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoKeyUtil.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoKeyUtil.java
index c4e5a78d7..dec7bff16 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoKeyUtil.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoKeyUtil.java
@@ -21,6 +21,7 @@
 package org.jivesoftware.smackx.omemo.signal;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.TreeMap;
 
@@ -30,16 +31,18 @@ import org.jivesoftware.smackx.omemo.internal.OmemoDevice;
 import org.jivesoftware.smackx.omemo.trust.OmemoFingerprint;
 import org.jivesoftware.smackx.omemo.util.OmemoKeyUtil;
 
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.InvalidKeyException;
-import org.whispersystems.libsignal.ecc.Curve;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
-import org.whispersystems.libsignal.util.KeyHelper;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.InvalidKeyException;
+import org.signal.libsignal.protocol.InvalidMessageException;
+import org.signal.libsignal.protocol.ecc.Curve;
+import org.signal.libsignal.protocol.ecc.ECKeyPair;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.util.Medium;
 
 /**
  * Concrete implementation of the KeyUtil for an implementation using the Signal library.
@@ -51,13 +54,13 @@ public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKe
 
     @Override
     public IdentityKeyPair generateOmemoIdentityKeyPair() {
-        return KeyHelper.generateIdentityKeyPair();
+        return IdentityKeyPair.generate();
     }
 
     @Override
     @SuppressWarnings("NonApiType")
     public TreeMap<Integer, PreKeyRecord> generateOmemoPreKeys(int currentPreKeyId, int count) {
-        List<PreKeyRecord> preKeyRecords = KeyHelper.generatePreKeys(currentPreKeyId, count);
+        List<PreKeyRecord> preKeyRecords = generatePreKeys(currentPreKeyId, count);
         TreeMap<Integer, PreKeyRecord> map = new TreeMap<>();
         for (PreKeyRecord p : preKeyRecords) {
             map.put(p.getId(), p);
@@ -65,20 +68,44 @@ public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKe
         return map;
     }
 
+    private static List<PreKeyRecord> generatePreKeys(int start, int count) {
+        List<PreKeyRecord> results = new ArrayList<>(count);
+
+        start--;
+
+        for (int i = 0; i < count; i++) {
+            int pkIdx = ((start + i) % (Medium.MAX_VALUE - 1)) + 1;
+            results.add(new PreKeyRecord(pkIdx, Curve.generateKeyPair()));
+        }
+
+        return results;
+    }
+
     @Override
     public SignedPreKeyRecord generateOmemoSignedPreKey(IdentityKeyPair identityKeyPair, int currentPreKeyId)
             throws CorruptedOmemoKeyException {
         try {
-            return KeyHelper.generateSignedPreKey(identityKeyPair, currentPreKeyId);
+            return generateSignedPreKey(identityKeyPair, currentPreKeyId);
         } catch (InvalidKeyException e) {
             throw new CorruptedOmemoKeyException(e);
         }
     }
 
+    private static SignedPreKeyRecord generateSignedPreKey(IdentityKeyPair identityKeyPair, int signedPreKeyId) throws InvalidKeyException {
+        ECKeyPair keyPair   = Curve.generateKeyPair();
+        byte[]    signature = Curve.calculateSignature(identityKeyPair.getPrivateKey(), keyPair.getPublicKey().serialize());
+
+        return new SignedPreKeyRecord(signedPreKeyId, System.currentTimeMillis(), keyPair, signature);
+    }
+
     @Override
     public SignedPreKeyRecord signedPreKeyFromBytes(byte[] data) throws IOException {
         if (data == null) return null;
-        return new SignedPreKeyRecord(data);
+        try {
+            return new SignedPreKeyRecord(data);
+        } catch (InvalidMessageException e) {
+            throw new IOException(e);
+        }
     }
 
     @Override
@@ -89,7 +116,11 @@ public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKe
     @Override
     public SessionRecord rawSessionFromBytes(byte[] data) throws IOException {
         if (data == null) return null;
-        return new SessionRecord(data);
+        try {
+            return new SessionRecord(data);
+        } catch (InvalidMessageException e) {
+            throw new IOException(e);
+        }
     }
 
     @Override
@@ -100,11 +131,7 @@ public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKe
     @Override
     public IdentityKeyPair identityKeyPairFromBytes(byte[] data) throws CorruptedOmemoKeyException {
         if (data == null) return null;
-        try {
-            return new IdentityKeyPair(data);
-        } catch (InvalidKeyException e) {
-            throw new CorruptedOmemoKeyException(e);
-        }
+        return new IdentityKeyPair(data);
     }
 
     @Override
@@ -135,7 +162,11 @@ public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKe
     @Override
     public PreKeyRecord preKeyFromBytes(byte[] bytes) throws IOException {
         if (bytes == null) return null;
-        return new PreKeyRecord(bytes);
+        try {
+            return new PreKeyRecord(bytes);
+        } catch (InvalidMessageException e) {
+            throw new IOException(e);
+        }
     }
 
     @Override
@@ -188,7 +219,11 @@ public class SignalOmemoKeyUtil extends OmemoKeyUtil<IdentityKeyPair, IdentityKe
 
     @Override
     public byte[] preKeyForBundle(PreKeyRecord preKeyRecord) {
-        return preKeyRecord.getKeyPair().getPublicKey().serialize();
+        try {
+            return preKeyRecord.getKeyPair().getPublicKey().serialize();
+        } catch (InvalidKeyException e) {
+            throw new RuntimeException(e);
+        }
     }
 
     @Override
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoRatchet.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoRatchet.java
index 6ab4311f8..3e9b9c5e2 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoRatchet.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoRatchet.java
@@ -35,26 +35,27 @@ import org.jivesoftware.smackx.omemo.exceptions.UntrustedOmemoIdentityException;
 import org.jivesoftware.smackx.omemo.internal.CiphertextTuple;
 import org.jivesoftware.smackx.omemo.internal.OmemoDevice;
 
-import org.whispersystems.libsignal.DuplicateMessageException;
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.InvalidKeyException;
-import org.whispersystems.libsignal.InvalidKeyIdException;
-import org.whispersystems.libsignal.InvalidMessageException;
-import org.whispersystems.libsignal.InvalidVersionException;
-import org.whispersystems.libsignal.LegacyMessageException;
-import org.whispersystems.libsignal.NoSessionException;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.UntrustedIdentityException;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.protocol.CiphertextMessage;
-import org.whispersystems.libsignal.protocol.PreKeySignalMessage;
-import org.whispersystems.libsignal.protocol.SignalMessage;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.DuplicateMessageException;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.InvalidKeyException;
+import org.signal.libsignal.protocol.InvalidKeyIdException;
+import org.signal.libsignal.protocol.InvalidMessageException;
+import org.signal.libsignal.protocol.InvalidVersionException;
+import org.signal.libsignal.protocol.LegacyMessageException;
+import org.signal.libsignal.protocol.NoSessionException;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.UntrustedIdentityException;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.message.CiphertextMessage;
+import org.signal.libsignal.protocol.message.PreKeySignalMessage;
+import org.signal.libsignal.protocol.message.SignalMessage;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
+
 
 public class SignalOmemoRatchet
         extends OmemoRatchet<IdentityKeyPair, IdentityKey, PreKeyRecord, SignedPreKeyRecord, SessionRecord,
@@ -103,7 +104,7 @@ public class SignalOmemoRatchet
             catch (UntrustedIdentityException e) {
                 throw new AssertionError("Signals trust management MUST be disabled.");
             }
-            catch (LegacyMessageException | InvalidKeyException e) {
+            catch (InvalidKeyException e) {
                 throw new CryptoFailedException(e);
             }
             catch (InvalidKeyIdException e) {
@@ -134,7 +135,15 @@ public class SignalOmemoRatchet
                 LOGGER.log(Level.INFO, "Decryption of SignalMessage from " + sender +
                         " failed, since the message has been decrypted before.");
                 return null;
+            } catch (InvalidVersionException e) {
+                throw new RuntimeException(e);
+            } catch (InvalidKeyException e) {
+                throw new RuntimeException(e);
             }
+        } catch (LegacyMessageException e) {
+            throw new RuntimeException(e);
+        } catch (InvalidKeyException e) {
+            throw new RuntimeException(e);
         }
 
         return decryptedKey;
@@ -156,7 +165,7 @@ public class SignalOmemoRatchet
     }
 
     private SessionCipher getCipher(OmemoDevice device) {
-        return new SessionCipher(storeConnector, storeConnector, storeConnector, storeConnector,
+        return new SessionCipher(storeConnector, storeConnector, storeConnector, null, storeConnector,
                 SignalOmemoStoreConnector.asAddress(device));
     }
 }
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoService.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoService.java
index c5efd6fff..1369929c0 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoService.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoService.java
@@ -28,17 +28,19 @@ import org.jivesoftware.smackx.omemo.OmemoStore;
 import org.jivesoftware.smackx.omemo.exceptions.CorruptedOmemoKeyException;
 import org.jivesoftware.smackx.omemo.internal.OmemoDevice;
 
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.SessionBuilder;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.UntrustedIdentityException;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.SessionBuilder;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.UntrustedIdentityException;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
+
 
 /**
  * Concrete implementation of the OmemoService using the Signal library.
@@ -103,7 +105,7 @@ public final class SignalOmemoService
         try {
             builder.process(contactsBundle);
             LOGGER.log(Level.FINE, "Session built with " + contactsDevice);
-        } catch (org.whispersystems.libsignal.InvalidKeyException e) {
+        } catch (org.signal.libsignal.protocol.InvalidKeyException e) {
             throw new CorruptedOmemoKeyException(e);
         } catch (UntrustedIdentityException e) {
             // This should never happen.
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStore.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStore.java
index bde4f802a..c0fea05da 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStore.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStore.java
@@ -23,15 +23,15 @@ package org.jivesoftware.smackx.omemo.signal;
 import org.jivesoftware.smackx.omemo.OmemoStore;
 import org.jivesoftware.smackx.omemo.util.OmemoKeyUtil;
 
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
 
 /**
  * Implementation of the OmemoStore using the Signal library.
diff --git a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStoreConnector.java b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStoreConnector.java
index ccec0ad5e..3dba13e2d 100644
--- a/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStoreConnector.java
+++ b/smack-omemo-signal/src/main/java/org/jivesoftware/smackx/omemo/signal/SignalOmemoStoreConnector.java
@@ -35,20 +35,22 @@ import org.jivesoftware.smackx.omemo.internal.OmemoDevice;
 import org.jxmpp.jid.BareJid;
 import org.jxmpp.jid.impl.JidCreate;
 import org.jxmpp.stringprep.XmppStringprepException;
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.InvalidKeyIdException;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.IdentityKeyStore;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.PreKeyStore;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SessionStore;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyStore;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.InvalidKeyIdException;
+import org.signal.libsignal.protocol.NoSessionException;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.IdentityKeyStore;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.PreKeyStore;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SessionStore;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyStore;
+
 
 /**
  * Class that adapts libsignal-protocol-java's Store classes to the OmemoStore class.
@@ -200,6 +202,11 @@ public class SignalOmemoStoreConnector
         }
     }
 
+    @Override
+    public List<SessionRecord> loadExistingSessions(List<SignalProtocolAddress> addresses) throws NoSessionException {
+        throw new RuntimeException("Not implemented.");
+    }
+
     @Override
     public List<Integer> getSubDeviceSessions(String s) {
         BareJid jid;
diff --git a/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/LegacySignalOmemoKeyUtilTest.java b/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/LegacySignalOmemoKeyUtilTest.java
index e7b91e0a8..db89d04c1 100644
--- a/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/LegacySignalOmemoKeyUtilTest.java
+++ b/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/LegacySignalOmemoKeyUtilTest.java
@@ -32,9 +32,9 @@ import org.jivesoftware.smackx.omemo.exceptions.CorruptedOmemoKeyException;
 import org.jivesoftware.smackx.omemo.signal.SignalOmemoKeyUtil;
 
 import org.junit.Test;
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
 
 /**
  * Test SignalOmemoKeyUtil methods.
diff --git a/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoKeyUtilTest.java b/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoKeyUtilTest.java
index d14e08ef5..4dd3e7f44 100644
--- a/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoKeyUtilTest.java
+++ b/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoKeyUtilTest.java
@@ -28,13 +28,13 @@ import org.jivesoftware.smackx.omemo.util.OmemoKeyUtil;
 
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
 
 /**
  * smack-omemo-signal implementation of {@link OmemoKeyUtilTest}.
diff --git a/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoStoreTest.java b/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoStoreTest.java
index a4a9bedea..ce39a26ad 100644
--- a/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoStoreTest.java
+++ b/smack-omemo-signal/src/test/java/org/jivesoftware/smackx/omemo/SignalOmemoStoreTest.java
@@ -35,15 +35,15 @@ import org.junit.rules.TemporaryFolder;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
 import org.jxmpp.stringprep.XmppStringprepException;
-import org.whispersystems.libsignal.IdentityKey;
-import org.whispersystems.libsignal.IdentityKeyPair;
-import org.whispersystems.libsignal.SessionCipher;
-import org.whispersystems.libsignal.SignalProtocolAddress;
-import org.whispersystems.libsignal.ecc.ECPublicKey;
-import org.whispersystems.libsignal.state.PreKeyBundle;
-import org.whispersystems.libsignal.state.PreKeyRecord;
-import org.whispersystems.libsignal.state.SessionRecord;
-import org.whispersystems.libsignal.state.SignedPreKeyRecord;
+import org.signal.libsignal.protocol.IdentityKey;
+import org.signal.libsignal.protocol.IdentityKeyPair;
+import org.signal.libsignal.protocol.SessionCipher;
+import org.signal.libsignal.protocol.SignalProtocolAddress;
+import org.signal.libsignal.protocol.ecc.ECPublicKey;
+import org.signal.libsignal.protocol.state.PreKeyBundle;
+import org.signal.libsignal.protocol.state.PreKeyRecord;
+import org.signal.libsignal.protocol.state.SessionRecord;
+import org.signal.libsignal.protocol.state.SignedPreKeyRecord;
 
 /**
  * smack-omemo-signal implementation of {@link OmemoStoreTest}.