Use fake CDSI client.

libsignal/service/src/main/java/org/whispersystems/signalservice/api/services/CdsiClient.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2024 Signal Messenger, LLC
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+package org.whispersystems.signalservice.api.services;
+
+import org.signal.libsignal.attest.AttestationDataException;
+import org.signal.libsignal.sgxsession.SgxCommunicationFailureException;
+
+import java.time.Instant;
+import java.util.Arrays;
+
+public class CdsiClient {
+  public long created;
+
+  public CdsiClient(byte[] mrenclave, byte[] attestationMsg, Instant currentInstant) throws AttestationDataException {
+    if (!Arrays.equals(attestationMsg, "CDSI".getBytes())) {
+      throw new AttestationDataException("Bad fake");
+    }
+
+    created = currentInstant.toEpochMilli();
+  }
+
+  public byte[] initialRequest() {
+    return "Client".getBytes();
+  }
+
+  public void completeHandshake(byte[] handshakeResponse) throws SgxCommunicationFailureException {
+    if (!Arrays.equals(handshakeResponse, "Ready".getBytes())) {
+      throw new SgxCommunicationFailureException("Bad fake");
+    }
+  }
+
+  public byte[] establishedSend(byte[] plaintext) {
+    return plaintext;
+  }
+
+  public byte[] establishedRecv(byte[] ciphertext) {
+    return ciphertext;
+  }
+}

libsignal/service/src/main/java/org/whispersystems/signalservice/api/services/CdsiSocket.java

@@ -3,7 +3,6 @@
 import org.signal.cdsi.proto.ClientRequest;
 import org.signal.cdsi.proto.ClientResponse;
 import org.signal.libsignal.attest.AttestationDataException;
-import org.signal.libsignal.cds2.Cds2Client;
 import org.signal.libsignal.protocol.logging.Log;
 import org.signal.libsignal.protocol.util.Pair;
 import org.signal.libsignal.sgxsession.SgxCommunicationFailureException;
@@ -58,7 +57,7 @@ final class CdsiSocket {
   private final OkHttpClient  okhttp;
   private final String        mrEnclave;
 
-  private Cds2Client client;
+  private CdsiClient client;
 
   CdsiSocket(SignalServiceConfiguration configuration, String mrEnclave) {
     this.cdsiUrl   = chooseUrl(configuration.getSignalCdsiUrls());
@@ -116,7 +115,7 @@ public void onMessage(WebSocket webSocket, okio.ByteString bytes) {
                 throw new IOException("Received a message before we were open!");
 
               case WAITING_FOR_CONNECTION:
-                client = new Cds2Client(Hex.fromStringCondensed(mrEnclave), bytes.toByteArray(), Instant.now());
+                client = new CdsiClient(Hex.fromStringCondensed(mrEnclave), bytes.toByteArray(), Instant.now());
 
                 Log.d(TAG, "[onMessage] Sending initial handshake...");
                 webSocket.send(okio.ByteString.of(client.initialRequest()));