Added listing of protocols and ciphers

app/src/main/java/eu/faircode/email/FragmentOptionsMisc.java

@@ -50,9 +50,16 @@ import androidx.lifecycle.Observer;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import androidx.preference.PreferenceManager;
 
+import java.io.IOException;
 import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
 import java.util.SortedMap;
 
+import javax.net.ssl.SSLSocket;
+import javax.net.ssl.SSLSocketFactory;
+
 import io.requery.android.database.sqlite.SQLiteDatabase;
 
 public class FragmentOptionsMisc extends FragmentBase implements SharedPreferences.OnSharedPreferenceChangeListener {
@@ -81,6 +88,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
     private TextView tvStorageSpace;
     private TextView tvFingerprint;
     private Button btnCharsets;
+    private Button btnCiphers;
 
     private Group grpDebug;
 
@@ -134,6 +142,7 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
         tvStorageSpace = view.findViewById(R.id.tvStorageSpace);
         tvFingerprint = view.findViewById(R.id.tvFingerprint);
         btnCharsets = view.findViewById(R.id.btnCharsets);
+        btnCiphers = view.findViewById(R.id.btnCiphers);
 
         grpDebug = view.findViewById(R.id.grpDebug);
 
@@ -331,6 +340,57 @@ public class FragmentOptionsMisc extends FragmentBase implements SharedPreferenc
             }
         });
 
+        btnCiphers.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                StringBuilder sb = new StringBuilder();
+                try {
+                    SSLSocket socket = (SSLSocket) SSLSocketFactory.getDefault().createSocket();
+
+                    List<String> protocols = new ArrayList<>();
+                    protocols.addAll(Arrays.asList(socket.getEnabledProtocols()));
+
+                    List<String> ciphers = new ArrayList<>();
+                    ciphers.addAll(Arrays.asList(socket.getEnabledCipherSuites()));
+
+                    for (String p : socket.getSupportedProtocols()) {
+                        boolean enabled = protocols.contains(p);
+                        if (!enabled)
+                            sb.append("(");
+                        sb.append(p);
+                        if (!enabled)
+                            sb.append(")");
+                        sb.append("\r\n");
+                    }
+                    sb.append("\r\n");
+
+                    for (String c : socket.getSupportedCipherSuites()) {
+                        boolean enabled = ciphers.contains(c);
+                        if (!enabled)
+                            sb.append("(");
+                        sb.append(c);
+                        if (!enabled)
+                            sb.append(")");
+                        sb.append("\r\n");
+                    }
+                    sb.append("\r\n");
+                } catch (IOException ex) {
+                    sb.append(ex.toString());
+                }
+
+                new AlertDialog.Builder(getContext())
+                        .setTitle(R.string.title_advanced_ciphers)
+                        .setMessage(sb.toString())
+                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                // Do nothing
+                            }
+                        })
+                        .show();
+            }
+        });
+
         tvFtsIndexed.setText(null);
 
         DB db = DB.getInstance(getContext());

app/src/main/res/layout/fragment_options_misc.xml

@@ -382,10 +382,20 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvFingerprint" />
 
+        <Button
+            android:id="@+id/btnCiphers"
+            style="?android:attr/buttonStyleSmall"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:text="@string/title_advanced_ciphers"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/btnCharsets" />
+
         <androidx.constraintlayout.widget.Group
             android:id="@+id/grpDebug"
             android:layout_width="0dp"
             android:layout_height="0dp"
-            app:constraint_referenced_ids="tvProcessors,tvMemoryClass,tvStorageSpace,tvFingerprint,btnCharsets" />
+            app:constraint_referenced_ids="tvProcessors,tvMemoryClass,tvStorageSpace,tvFingerprint,btnCharsets,btnCiphers" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </eu.faircode.email.ScrollViewEx>

app/src/main/res/values/strings.xml

@@ -458,6 +458,7 @@
     <string name="title_advanced_memory_class" translatable="false">Memory class: %1$s</string>
     <string name="title_advanced_storage_space" translatable="false">Storage space: %1$s/%2$s</string>
     <string name="title_advanced_charsets" translatable="false">Charsets</string>
+    <string name="title_advanced_ciphers" translatable="false">Ciphers</string>
 
     <string name="title_advanced_enabled_hint">Globally disable or enable receiving of messages</string>
     <string name="title_advanced_manual_hint">If synchronization is disabled, it is still possible to synchronize manually by pulling down the message list.</string>