init Xposed module; add HCEFUnlocker

app/build.gradle

@@ -46,4 +46,5 @@ dependencies {
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
     implementation 'com.google.code.gson:gson:2.8.9'
+    compileOnly 'de.robv.android.xposed:api:82'
 }

app/src/main/AndroidManifest.xml

@@ -43,7 +43,15 @@
                 android:resource="@xml/host_nfcf_service" />
         </service>
 
-
+        <meta-data
+            android:name="xposedmodule"
+            android:value="true" />
+        <meta-data
+            android:name="xposedminversion"
+            android:value="30" />
+        <meta-data
+            android:name="xposeddescription"
+            android:value="Emulate every AIC Card" />
     </application>
 
 

app/src/main/assets/xposed_init

@@ -0,0 +1 @@
+moe.tqlwsl.aicemu.xp

app/src/main/java/moe/tqlwsl/aicemu/xp.java

@@ -0,0 +1,79 @@
+package moe.tqlwsl.aicemu;
+
+import android.util.Log;
+
+import de.robv.android.xposed.IXposedHookLoadPackage;
+import de.robv.android.xposed.XC_MethodHook;
+import de.robv.android.xposed.XC_MethodReplacement;
+import de.robv.android.xposed.XposedBridge;
+import de.robv.android.xposed.XposedHelpers;
+import de.robv.android.xposed.callbacks.XC_LoadPackage;
+
+public class xp implements IXposedHookLoadPackage {
+    private final String TAG = "AICEmu";
+
+    // from https://github.com/OLIET2357/HCEFUnlocker
+    @Override
+    public void handleLoadPackage(XC_LoadPackage.LoadPackageParam lpparam) throws Throwable {
+        XposedBridge.log("In " + lpparam.packageName);
+        if (lpparam.packageName.equals("com.android.nfc")) {
+
+            XposedHelpers.findAndHookMethod("android.nfc.cardemulation.NfcFCardEmulation", lpparam.classLoader,
+                    "isValidSystemCode", String.class, new XC_MethodReplacement() {
+                @Override
+                protected Object replaceHookedMethod(XC_MethodHook.MethodHookParam param) throws Throwable {
+                    String systemCode = (String) param.args[0];
+                    if (systemCode == null) {
+                        return false;
+                    }
+
+                    if (systemCode.length() != 4) {
+                        Log.e(TAG, "System Code " + systemCode + " is not a valid System Code.");
+                        return false;
+                    }
+                    // check if the value is between "4000" and "4FFF" (excluding "4*FF")
+                    if (!systemCode.startsWith("4") || systemCode.toUpperCase().endsWith("FF")) {
+                        // Log.e(TAG, "System Code " + systemCode + " is not a valid System Code.");
+                        // return false;
+                    }
+                    try {
+                        Integer.parseInt(systemCode, 16);
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "System Code " + systemCode + " is not a valid System Code.");
+                        return false;
+                    }
+                    return true;
+                }
+            });
+
+            XposedHelpers.findAndHookMethod("android.nfc.cardemulation.NfcFCardEmulation", lpparam.classLoader,
+                    "isValidNfcid2", String.class, new XC_MethodReplacement() {
+                @Override
+                protected Object replaceHookedMethod(MethodHookParam param) throws Throwable {
+                    String nfcid2 = (String) param.args[0];
+                    if (nfcid2 == null) {
+                        return false;
+                    }
+                    if (nfcid2.length() != 16) {
+                        Log.e(TAG, "NFCID2 " + nfcid2 + " is not a valid NFCID2.");
+                        return false;
+                    }
+                    // check if the the value starts with "02FE"
+                    if (!nfcid2.toUpperCase().startsWith("02FE")) {
+                        // Log.e(TAG, "NFCID2 " + nfcid2 + " is not a valid NFCID2.");
+                        // return false;
+                    }
+                    try {
+                        Long.parseLong(nfcid2, 16);
+                    } catch (NumberFormatException e) {
+                        Log.e(TAG, "NFCID2 " + nfcid2 + " is not a valid NFCID2.");
+                        return false;
+                    }
+                    return true;
+                }
+            });
+
+            XposedBridge.log("Hook successed!!!");
+        }
+    }
+}

settings.gradle

@@ -10,6 +10,7 @@ dependencyResolutionManagement {
     repositories {
         google()
         mavenCentral()
+        maven { url "https://api.xposed.info/" }
     }
 }
 rootProject.name = "AICEmu"