diff --git a/core/client/android/.gitignore b/core/client/android/.gitignore
new file mode 100644
index 0000000..4f51afb
--- /dev/null
+++ b/core/client/android/.gitignore
@@ -0,0 +1,10 @@
+*.iml
+.gradle
+local.properties
+.idea
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties
diff --git a/core/client/android/app/.gitignore b/core/client/android/app/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/core/client/android/app/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/core/client/android/app/build.gradle b/core/client/android/app/build.gradle
new file mode 100644
index 0000000..44fe4cf
--- /dev/null
+++ b/core/client/android/app/build.gradle
@@ -0,0 +1,49 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "me.lekva.pcloud"
+        minSdk 21
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        coreLibraryDesugaringEnabled true
+
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+    implementation 'com.journeyapps:zxing-android-embedded:4.3.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.legacy:legacy-support-v13:1.0.0'
+    implementation "androidx.activity:activity:1.3.1"
+
+    implementation 'com.google.code.gson:gson:2.8.9'
+
+    // Desugaring and multidex is required for API < 21.
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
+    implementation 'androidx.multidex:multidex:2.0.1'
+
+    implementation 'com.google.android.material:material:1.3.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
+    implementation 'androidx.camera:camera-core:1.1.0-alpha11'
+    implementation 'androidx.camera:camera-lifecycle:1.1.0-alpha11'
+    implementation 'androidx.camera:camera-view:1.0.0-alpha31'
+}
\ No newline at end of file
diff --git a/core/client/android/app/proguard-rules.pro b/core/client/android/app/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/core/client/android/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/core/client/android/app/src/main/AndroidManifest.xml b/core/client/android/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..24728da
--- /dev/null
+++ b/core/client/android/app/src/main/AndroidManifest.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="me.lekva.pcloud">
+
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.INTERNET" />
+    <!--uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /-->
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Pcloud"
+        android:hardwareAccelerated="true">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/Base64TypeAdapter.java b/core/client/android/app/src/main/java/me/lekva/pcloud/Base64TypeAdapter.java
new file mode 100644
index 0000000..eda2c58
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/Base64TypeAdapter.java
@@ -0,0 +1,28 @@
+package me.lekva.pcloud;
+
+import android.os.Build;
+import android.util.Base64;
+
+import androidx.annotation.RequiresApi;
+
+import com.google.gson.TypeAdapter;
+import com.google.gson.stream.JsonReader;
+import com.google.gson.stream.JsonWriter;
+
+import java.io.IOException;
+
+public class Base64TypeAdapter extends TypeAdapter<byte[]> {
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    @Override
+    public void write(JsonWriter out, byte[] value) throws IOException {
+        String val = Base64.encodeToString(value, Base64.NO_WRAP);
+        // out.value(val.substring(0, val.length() - 1));
+        out.value(val);
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    @Override
+    public byte[] read(JsonReader in) throws IOException {
+        return Base64.decode(in.nextString(), Base64.NO_WRAP);
+    }
+}
\ No newline at end of file
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/MainActivity.java b/core/client/android/app/src/main/java/me/lekva/pcloud/MainActivity.java
new file mode 100644
index 0000000..4b62246
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/MainActivity.java
@@ -0,0 +1,94 @@
+package me.lekva.pcloud;
+
+import android.Manifest;
+import android.app.Activity;
+import android.content.pm.PackageManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.view.View;
+
+import androidx.activity.result.ActivityResultLauncher;
+import androidx.annotation.RequiresApi;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.app.ActivityCompat;
+import androidx.core.content.ContextCompat;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.journeyapps.barcodescanner.ScanContract;
+import com.journeyapps.barcodescanner.ScanOptions;
+
+import java.io.BufferedOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.nio.charset.StandardCharsets;
+
+public class MainActivity extends AppCompatActivity {
+    private final ActivityResultLauncher<ScanOptions> barcodeLauncher = registerForActivityResult(new ScanContract(),
+            result -> {
+                if(result.getContents() != null) {
+                    Gson gson = new GsonBuilder().disableHtmlEscaping().create();
+                    VPNApiServerConfig config = gson.fromJson(result.getContents(), VPNApiServerConfig.class);
+                    join(config);
+                }
+            });
+
+    private void join(VPNApiServerConfig config) {
+        new Thread(() -> {
+            VerifyRequest req = new VerifyRequest();
+            req.message = config.message;
+            req.signature = config.signature;
+            Gson gson = new GsonBuilder().disableHtmlEscaping().create();
+            byte[] data = gson.toJson(req).getBytes(StandardCharsets.UTF_8);
+            HttpURLConnection urlConnection = null;
+            try {
+                URL url = new URL(config.address + "/api/verify");
+                urlConnection = (HttpURLConnection) url.openConnection();
+                urlConnection.setRequestMethod("POST");
+                urlConnection.setRequestProperty("Content-Type", "application/json; charset=utf-8");
+                urlConnection.setRequestProperty("Connection", "close");
+
+                urlConnection.setInstanceFollowRedirects(false);
+                urlConnection.setDoOutput(true);
+                urlConnection.setFixedLengthStreamingMode(data.length);
+
+                OutputStream out = new BufferedOutputStream(urlConnection.getOutputStream());
+                out.write(data);
+                out.flush();
+                out.close();
+                System.out.println(urlConnection.getResponseCode());
+            } catch (IOException e) {
+                e.printStackTrace();
+            } finally {
+                urlConnection.disconnect();
+            }
+        }).start();
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        Activity act = this;
+        findViewById(R.id.scan_qr_code).setOnClickListener(new View.OnClickListener() {
+            @RequiresApi(api = Build.VERSION_CODES.M)
+            @Override
+            public void onClick(View view) {
+                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.INTERNET) != PackageManager.PERMISSION_GRANTED) {
+                    System.out.println("fooooooo");
+                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.INTERNET}, 20);
+                }
+
+                ScanOptions options = new ScanOptions();
+                options.setDesiredBarcodeFormats(ScanOptions.QR_CODE);
+                options.setPrompt("Join PCloud network");
+                options.setCameraId(0);  // Use a specific camera of the device
+                options.setBeepEnabled(false);
+                options.setBarcodeImageEnabled(false);
+                barcodeLauncher.launch(options);
+            }
+        });
+    }
+}
\ No newline at end of file
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/VPNApiServerConfig.java b/core/client/android/app/src/main/java/me/lekva/pcloud/VPNApiServerConfig.java
new file mode 100644
index 0000000..0128a76
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/VPNApiServerConfig.java
@@ -0,0 +1,13 @@
+package me.lekva.pcloud;
+
+import com.google.gson.annotations.JsonAdapter;
+import com.google.gson.annotations.SerializedName;
+
+public class VPNApiServerConfig {
+    @SerializedName("vpn_api_addr")
+    public String address;
+    @JsonAdapter(Base64TypeAdapter.class)
+    public byte[] message;
+    @JsonAdapter(Base64TypeAdapter.class)
+    public byte[] signature;
+}
diff --git a/core/client/android/app/src/main/java/me/lekva/pcloud/VerifyRequest.java b/core/client/android/app/src/main/java/me/lekva/pcloud/VerifyRequest.java
new file mode 100644
index 0000000..7feaef1
--- /dev/null
+++ b/core/client/android/app/src/main/java/me/lekva/pcloud/VerifyRequest.java
@@ -0,0 +1,10 @@
+package me.lekva.pcloud;
+
+import com.google.gson.annotations.JsonAdapter;
+
+public class VerifyRequest {
+    @JsonAdapter(Base64TypeAdapter.class)
+    public byte[] message;
+    @JsonAdapter(Base64TypeAdapter.class)
+    public byte[] signature;
+}
diff --git a/core/client/android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml b/core/client/android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
new file mode 100644
index 0000000..2b068d1
--- /dev/null
+++ b/core/client/android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml
@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/drawable/ic_launcher_background.xml b/core/client/android/app/src/main/res/drawable/ic_launcher_background.xml
new file mode 100644
index 0000000..07d5da9
--- /dev/null
+++ b/core/client/android/app/src/main/res/drawable/ic_launcher_background.xml
@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>
diff --git a/core/client/android/app/src/main/res/layout/activity_main.xml b/core/client/android/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..988e611
--- /dev/null
+++ b/core/client/android/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <androidx.camera.view.PreviewView
+        android:id="@+id/camera_preview"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <androidx.appcompat.widget.AppCompatButton
+        android:id="@+id/scan_qr_code"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/scan_qr_code"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/core/client/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..eca70cf
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/core/client/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..eca70cf
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/mipmap-hdpi/ic_launcher.webp b/core/client/android/app/src/main/res/mipmap-hdpi/ic_launcher.webp
new file mode 100644
index 0000000..c209e78
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-hdpi/ic_launcher.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp b/core/client/android/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..b2dfe3d
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-hdpi/ic_launcher_round.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-mdpi/ic_launcher.webp b/core/client/android/app/src/main/res/mipmap-mdpi/ic_launcher.webp
new file mode 100644
index 0000000..4f0f1d6
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-mdpi/ic_launcher.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp b/core/client/android/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..62b611d
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-mdpi/ic_launcher_round.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-xhdpi/ic_launcher.webp b/core/client/android/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
new file mode 100644
index 0000000..948a307
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-xhdpi/ic_launcher.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp b/core/client/android/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..1b9a695
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-xhdpi/ic_launcher_round.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp b/core/client/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
new file mode 100644
index 0000000..28d4b77
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-xxhdpi/ic_launcher.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp b/core/client/android/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..9287f50
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp b/core/client/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
new file mode 100644
index 0000000..aa7d642
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp b/core/client/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
new file mode 100644
index 0000000..9126ae3
--- /dev/null
+++ b/core/client/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.webp
Binary files differ
diff --git a/core/client/android/app/src/main/res/values-night/themes.xml b/core/client/android/app/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000..96627ca
--- /dev/null
+++ b/core/client/android/app/src/main/res/values-night/themes.xml
@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Pcloud" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_200</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/values/colors.xml b/core/client/android/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..f8c6127
--- /dev/null
+++ b/core/client/android/app/src/main/res/values/colors.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/values/strings.xml b/core/client/android/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..4e112d8
--- /dev/null
+++ b/core/client/android/app/src/main/res/values/strings.xml
@@ -0,0 +1,4 @@
+<resources>
+    <string name="app_name">pcloud</string>
+    <string name="scan_qr_code">Scan QR code</string>
+</resources>
\ No newline at end of file
diff --git a/core/client/android/app/src/main/res/values/themes.xml b/core/client/android/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..8a512ae
--- /dev/null
+++ b/core/client/android/app/src/main/res/values/themes.xml
@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.Pcloud" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_500</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>
\ No newline at end of file
diff --git a/core/client/android/build.gradle b/core/client/android/build.gradle
new file mode 100644
index 0000000..026daed
--- /dev/null
+++ b/core/client/android/build.gradle
@@ -0,0 +1,17 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath "com.android.tools.build:gradle:7.0.4"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
\ No newline at end of file
diff --git a/core/client/android/gradle.properties b/core/client/android/gradle.properties
new file mode 100644
index 0000000..52f5917
--- /dev/null
+++ b/core/client/android/gradle.properties
@@ -0,0 +1,19 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
\ No newline at end of file
diff --git a/core/client/android/gradle/wrapper/gradle-wrapper.jar b/core/client/android/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e708b1c
--- /dev/null
+++ b/core/client/android/gradle/wrapper/gradle-wrapper.jar
Binary files differ
diff --git a/core/client/android/gradle/wrapper/gradle-wrapper.properties b/core/client/android/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..6a70da1
--- /dev/null
+++ b/core/client/android/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Sun Dec 12 14:50:29 GET 2021
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
diff --git a/core/client/android/gradlew b/core/client/android/gradlew
new file mode 100755
index 0000000..4f906e0
--- /dev/null
+++ b/core/client/android/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/core/client/android/gradlew.bat b/core/client/android/gradlew.bat
new file mode 100644
index 0000000..ac1b06f
--- /dev/null
+++ b/core/client/android/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/core/client/android/settings.gradle b/core/client/android/settings.gradle
new file mode 100644
index 0000000..f75bfc8
--- /dev/null
+++ b/core/client/android/settings.gradle
@@ -0,0 +1,10 @@
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+        jcenter() // Warning: this repository is going to shut down soon
+    }
+}
+rootProject.name = "pcloud"
+include ':app'
diff --git a/core/client/client.go b/core/client/client.go
new file mode 100644
index 0000000..b7c8294
--- /dev/null
+++ b/core/client/client.go
@@ -0,0 +1,38 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+type VPNApiClient struct {
+	addr string
+}
+
+type signReq struct {
+	Message []byte `json:"message"`
+}
+
+type signResp struct {
+	Signature []byte `json:"signature"`
+}
+
+func (c *VPNApiClient) Sign(message []byte) ([]byte, error) {
+	var data bytes.Buffer
+	if err := json.NewEncoder(&data).Encode(signReq{message}); err != nil {
+		return nil, err
+	}
+	client := &http.Client{}
+	r, err := client.Post(c.addr+"/api/sign", "application/json", &data)
+	if err != nil {
+		fmt.Println(111111)
+		return nil, err
+	}
+	resp := &signResp{}
+	if err := json.NewDecoder(r.Body).Decode(resp); err != nil {
+		return nil, err
+	}
+	return resp.Signature, nil
+}
diff --git a/core/client/go.mod b/core/client/go.mod
new file mode 100644
index 0000000..4ae29af
--- /dev/null
+++ b/core/client/go.mod
@@ -0,0 +1,9 @@
+module github.com/giolekva/pcloud/core/client
+
+go 1.16
+
+require (
+	gioui.org v0.0.0-20211201162354-9a5298914282
+	github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
+	golang.org/x/sys v0.0.0-20211007075335-d3039528d8ac // indirect
+)
diff --git a/core/client/go.sum b/core/client/go.sum
new file mode 100644
index 0000000..4d97385
--- /dev/null
+++ b/core/client/go.sum
@@ -0,0 +1,408 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
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+google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
+google.golang.org/appengine v1.2.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
+google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
+google.golang.org/genproto v0.0.0-20190530194941-fb225487d101/go.mod h1:z3L6/3dTEVtUr6QSP8miRzeRqwQOioJ9I66odjN4I7s=
+google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
+google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
+google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
+google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.22.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.23.1/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
+gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.1.3/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
+sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/core/client/main.go b/core/client/main.go
new file mode 100644
index 0000000..44bc154
--- /dev/null
+++ b/core/client/main.go
@@ -0,0 +1,78 @@
+package main
+
+import (
+	"bytes"
+	"encoding/json"
+	"flag"
+	"image"
+	"image/png"
+
+	"gioui.org/app"
+	"gioui.org/io/system"
+	"gioui.org/op"
+	"gioui.org/op/paint"
+	"gioui.org/unit"
+	qrcode "github.com/skip2/go-qrcode"
+)
+
+var vpnApiAddr = flag.String("vpn-api-addr", "", "VPN API server address")
+
+type config struct {
+	VPNApiAddr string `json:"vpn_api_addr"`
+	Message    []byte `json:"message"`
+	Signature  []byte `json:"signature"`
+}
+
+func prepareConfigQRCode(vc *VPNApiClient) (*image.Image, error) {
+	message := []byte("Hello PCloud")
+	signature, err := vc.Sign(message)
+	if err != nil {
+		return nil, err
+	}
+	c := config{
+		*vpnApiAddr,
+		message,
+		signature,
+	}
+	var data bytes.Buffer
+	if err := json.NewEncoder(&data).Encode(c); err != nil {
+		return nil, err
+	}
+	qr, err := qrcode.Encode(data.String(), qrcode.Medium, 1024)
+	if err != nil {
+		return nil, err
+	}
+	img, err := png.Decode(bytes.NewReader(qr))
+	if err != nil {
+		return nil, err
+	}
+	return &img, nil
+}
+
+func main() {
+	flag.Parse()
+	go func() {
+		vc := &VPNApiClient{
+			*vpnApiAddr,
+		}
+		img, err := prepareConfigQRCode(vc)
+		if err != nil {
+			panic(err)
+		}
+		w := app.NewWindow(
+			app.Size(unit.Px(1024), unit.Px(1024)),
+			app.Title("PCloud"),
+		)
+		ops := new(op.Ops)
+		for e := range w.Events() {
+			switch e := e.(type) {
+			case system.FrameEvent:
+				ops.Reset()
+				paint.NewImageOp(*img).Add(ops)
+				paint.PaintOp{}.Add(ops)
+				e.Frame(ops)
+			}
+		}
+	}()
+	app.Main()
+}
diff --git a/core/nebula/api/Makefile b/core/nebula/api/Makefile
index 3898183..d25b7ed 100644
--- a/core/nebula/api/Makefile
+++ b/core/nebula/api/Makefile
@@ -1,19 +1,22 @@
 clean:
 	rm -f api_*
 
+tidy:
+	go1.17.1 mod tidy -compat=1.17
+
 api_arm64: export CGO_ENABLED=0
 api_arm64: export GO111MODULE=on
 api_arm64: export GOOS=linux
 api_arm64: export GOARCH=arm64
-api_arm64:
-	go1.17.1 build -o api_arm64 main.go
+api_arm64: *.go
+	go1.17.1 build -o api_arm64 *.go
 
 api_amd64: export CGO_ENABLED=0
 api_amd64: export GO111MODULE=on
 api_amd64: export GOOS=linux
 api_amd64: export GOARCH=amd64
-api_amd64:
-	go1.17.1 build -o api_amd64 main.go
+api_amd64: *.go
+	go1.17.1 build -o api_amd64 *.go
 
 api: clean api_arm64 api_amd64
 
diff --git a/core/nebula/api/go.mod b/core/nebula/api/go.mod
index e8a515f..3a5bd6d 100644
--- a/core/nebula/api/go.mod
+++ b/core/nebula/api/go.mod
@@ -1,10 +1,48 @@
 module github.com/giolekva/pcloud/core/nebula/api
 
-go 1.16
+go 1.17
 
 require (
 	github.com/giolekva/pcloud/core/nebula/controller v0.0.0-20211209144208-c054df13a2a1
 	github.com/gorilla/mux v1.8.0
+	github.com/slackhq/nebula v1.5.0
+	inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6
+	k8s.io/api v0.23.0
 	k8s.io/apimachinery v0.23.0
 	k8s.io/client-go v0.23.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/go-logr/logr v1.2.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-cmp v0.5.5 // indirect
+	github.com/google/gofuzz v1.1.0 // indirect
+	github.com/googleapis/gnostic v0.5.5 // indirect
+	github.com/imdario/mergo v0.3.8 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	go4.org/intern v0.0.0-20211027215823-ae77deb06f29 // indirect
+	go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37 // indirect
+	golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
+	golang.org/x/net v0.0.0-20211101193420-4a448f8816b3 // indirect
+	golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f // indirect
+	golang.org/x/sys v0.0.0-20211103235746-7861aae1554b // indirect
+	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac // indirect
+	google.golang.org/appengine v1.6.7 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	k8s.io/klog/v2 v2.30.0 // indirect
+	k8s.io/kube-openapi v0.0.0-20211115234752-e816edb12b65 // indirect
+	k8s.io/utils v0.0.0-20210930125809-cb0fa318a74b // indirect
+	sigs.k8s.io/json v0.0.0-20211020170558-c049b76a60c6 // indirect
+	sigs.k8s.io/structured-merge-diff/v4 v4.1.2 // indirect
+	sigs.k8s.io/yaml v1.2.0 // indirect
+)
diff --git a/core/nebula/api/go.sum b/core/nebula/api/go.sum
index 5c2483f..b00b1a8 100644
--- a/core/nebula/api/go.sum
+++ b/core/nebula/api/go.sum
@@ -62,6 +62,7 @@
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
+github.com/dvyukov/go-fuzz v0.0.0-20210103155950-6a8e9d1f2415/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=
 github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
 github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/emicklei/go-restful v2.9.5+incompatible/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
@@ -178,8 +179,9 @@
 github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpOxQnU=
 github.com/ianlancetaylor/demangle v0.0.0-20181102032728-5e5cf60278f6/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
 github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
-github.com/imdario/mergo v0.3.5 h1:JboBksRwiiAJWvIYJVo46AfV+IAIKZpfrSzVKj42R4Q=
 github.com/imdario/mergo v0.3.5/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
+github.com/imdario/mergo v0.3.8 h1:CGgOkSJeqMRmt0D9XLWExdT4m4F1vd3FV3VPt+0VxkQ=
+github.com/imdario/mergo v0.3.8/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/json-iterator/go v1.1.11/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
@@ -228,6 +230,9 @@
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
+github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
+github.com/slackhq/nebula v1.5.0 h1:EdmvqSRcJrt4/4ki/R6O1NvjcSwdaXf9xpcF1NRavBk=
+github.com/slackhq/nebula v1.5.0/go.mod h1:xTcgNEbS7KLRvEQUKcNXUQIzNNaF+QtwgHxcYCDetBM=
 github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
 github.com/spf13/pflag v0.0.0-20170130214245-9ff6c6923cff/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
@@ -252,6 +257,10 @@
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
+go4.org/intern v0.0.0-20211027215823-ae77deb06f29 h1:UXLjNohABv4S58tHmeuIZDO6e3mHpW2Dx33gaNt03LE=
+go4.org/intern v0.0.0-20211027215823-ae77deb06f29/go.mod h1:cS2ma+47FKrLPdXFpr7CuxiTW3eyJbWew4qx0qtQWDA=
+go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37 h1:Tx9kY6yUkLge/pFG7IEMwDZy6CS2ajFc9TvQdPCW0uA=
+go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37/go.mod h1:FftLjUGFEDu5k8lt0ddY+HcrH/qU/0qk+H8j9/nTl3E=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@@ -260,6 +269,8 @@
 golang.org/x/crypto v0.0.0-20201002170205-7f63de1d35b0/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 h1:7I4JAnoQBe7ZtJcBaYHi5UtiO8tQHbUSXxL+pnGRANg=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@@ -332,8 +343,9 @@
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210520170846-37e1c6afe023/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20210825183410-e898025ed96a h1:bRuuGXV8wwSdGTB+CtJf+FjgO1APK1CoO39T4BN/XBw=
 golang.org/x/net v0.0.0-20210825183410-e898025ed96a/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20211101193420-4a448f8816b3 h1:VrJZAjbekhoRn7n5FBujY31gboH+iB3pdLxn3gE9FjU=
+golang.org/x/net v0.0.0-20211101193420-4a448f8816b3/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -404,13 +416,15 @@
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e h1:XMgFehsDnnLGtjvjOfqWSUzt0alpTR1RSEuznObga2c=
 golang.org/x/sys v0.0.0-20210831042530-f4d43177bf5e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20211103235746-7861aae1554b h1:1VkfZQv42XQlA/jchYumAnv1UPo6RgF9rJFkTgZIxO4=
+golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210220032956-6a3ed077a48d/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
-golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b h1:9zKuko04nR4gjZ4+DNjHqRlAJqbJETHwiNKDqTfOjfE=
 golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -612,6 +626,8 @@
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
 honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
 honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6 h1:acCzuUSQ79tGsM/O50VRFySfMm19IoMKL+sZztZkCxw=
+inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6/go.mod h1:y3MGhcFMlh0KZPMuXXow8mpjxxAk3yoDNsp4cQz54i8=
 k8s.io/api v0.22.2/go.mod h1:y3ydYpLJAaDI+BbSe2xmGcqxiWHmWjkEeIbiwHvnPR8=
 k8s.io/api v0.23.0 h1:WrL1gb73VSC8obi8cuYETJGXEoFNEh3LU0Pt+Sokgro=
 k8s.io/api v0.23.0/go.mod h1:8wmDdLBHBNxtOIytwLstXt5E9PddnZb0GaMcqsvDBpg=
diff --git a/core/nebula/api/main.go b/core/nebula/api/main.go
index ed09135..c0c4817 100644
--- a/core/nebula/api/main.go
+++ b/core/nebula/api/main.go
@@ -1,8 +1,8 @@
 package main
 
 import (
-	"context"
 	"embed"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"html/template"
@@ -11,17 +11,17 @@
 
 	"github.com/gorilla/mux"
 
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/clientcmd"
 
-	nebulav1 "github.com/giolekva/pcloud/core/nebula/controller/apis/nebula/v1"
 	clientset "github.com/giolekva/pcloud/core/nebula/controller/generated/clientset/versioned"
 )
 
 var port = flag.Int("port", 8080, "Port to listen on.")
 var kubeConfig = flag.String("kubeconfig", "", "Path to a kubeconfig. Only required if out-of-cluster.")
 var masterURL = flag.String("master", "", "The address of the Kubernetes API server. Overrides any value in kubeconfig. Only required if out-of-cluster.")
+var namespace = flag.String("namespace", "", "Namespace where Nebula CA and Node secrets are stored.")
+var caSecretName = flag.String("ca-secret-name", "", "Name of the Nebula CA secret storing certificate information.")
 
 //go:embed templates/*
 var tmpls embed.FS
@@ -38,99 +38,6 @@
 	return &Templates{index}, nil
 }
 
-type nebulaCA struct {
-	Name      string
-	Namespace string
-	Nodes     []nebulaNode
-}
-
-type nebulaNode struct {
-	Name      string
-	Namespace string
-	IP        string
-}
-
-type Manager struct {
-	kubeClient   kubernetes.Interface
-	nebulaClient clientset.Interface
-}
-
-func (m *Manager) ListAll() ([]*nebulaCA, error) {
-	ret := make([]*nebulaCA, 0)
-	cas, err := m.nebulaClient.LekvaV1().NebulaCAs("").List(context.TODO(), metav1.ListOptions{})
-	if err != nil {
-		return nil, err
-	}
-	for _, ca := range cas.Items {
-		ret = append(ret, &nebulaCA{
-			Name:      ca.Name,
-			Namespace: ca.Namespace,
-			Nodes:     make([]nebulaNode, 0),
-		})
-	}
-	nodes, err := m.nebulaClient.LekvaV1().NebulaNodes("").List(context.TODO(), metav1.ListOptions{})
-	if err != nil {
-		return nil, err
-	}
-	for _, node := range nodes.Items {
-		for _, ca := range ret {
-			if ca.Name == node.Spec.CAName {
-				ca.Nodes = append(ca.Nodes, nebulaNode{
-					Name:      node.Name,
-					Namespace: node.Namespace,
-					IP:        node.Spec.IPCidr,
-				})
-			}
-		}
-	}
-	return ret, nil
-}
-
-func (m *Manager) createNode(namespace, name, caNamespace, caName, ipCidr, pubKey string) (string, string, error) {
-	node := &nebulav1.NebulaNode{
-		ObjectMeta: metav1.ObjectMeta{
-			Name:      name,
-			Namespace: namespace,
-		},
-		Spec: nebulav1.NebulaNodeSpec{
-			CAName:      caName,
-			CANamespace: caNamespace,
-			IPCidr:      ipCidr,
-			PubKey:      pubKey,
-			SecretName:  fmt.Sprintf("%s-cert", name),
-		},
-	}
-	node, err := m.nebulaClient.LekvaV1().NebulaNodes(namespace).Create(context.TODO(), node, metav1.CreateOptions{})
-	if err != nil {
-		return "", "", err
-	}
-	return node.Namespace, node.Name, nil
-}
-
-func (m *Manager) getNodeCertQR(namespace, name string) ([]byte, error) {
-	node, err := m.nebulaClient.LekvaV1().NebulaNodes(namespace).Get(context.TODO(), name, metav1.GetOptions{})
-	if err != nil {
-		return nil, err
-	}
-	secret, err := m.kubeClient.CoreV1().Secrets(namespace).Get(context.TODO(), node.Spec.SecretName, metav1.GetOptions{})
-	if err != nil {
-		return nil, err
-	}
-	return secret.Data["host.png"], nil
-}
-
-func (m *Manager) getCACertQR(namespace, name string) ([]byte, error) {
-	ca, err := m.nebulaClient.LekvaV1().NebulaCAs(namespace).Get(context.TODO(), name, metav1.GetOptions{})
-	if err != nil {
-		return nil, err
-	}
-	secret, err := m.kubeClient.CoreV1().Secrets(namespace).Get(context.TODO(), ca.Spec.SecretName, metav1.GetOptions{})
-	if err != nil {
-		return nil, err
-	}
-	return secret.Data["ca.png"], nil
-}
-
 type Handler struct {
 	mgr   Manager
 	tmpls *Templates
@@ -151,7 +58,7 @@
 	vars := mux.Vars(r)
 	namespace := vars["namespace"]
 	name := vars["name"]
-	qr, err := h.mgr.getNodeCertQR(namespace, name)
+	qr, err := h.mgr.GetNodeCertQR(namespace, name)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
@@ -163,7 +70,7 @@
 	vars := mux.Vars(r)
 	namespace := vars["namespace"]
 	name := vars["name"]
-	qr, err := h.mgr.getCACertQR(namespace, name)
+	qr, err := h.mgr.GetCACertQR(namespace, name)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 	}
@@ -176,7 +83,7 @@
 		http.Error(w, err.Error(), http.StatusBadRequest)
 		return
 	}
-	_, _, err := h.mgr.createNode(
+	_, _, err := h.mgr.CreateNode(
 		r.FormValue("node-namespace"),
 		r.FormValue("node-name"),
 		r.FormValue("ca-namespace"),
@@ -191,6 +98,66 @@
 	http.Redirect(w, r, "/", http.StatusSeeOther)
 }
 
+func (h *Handler) getNextIP(w http.ResponseWriter, r *http.Request) {
+	ip, err := h.mgr.getNextIP()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	fmt.Fprint(w, ip)
+}
+
+type signReq struct {
+	Message []byte `json:"message"`
+}
+
+type signResp struct {
+	Signature []byte `json:"signature"`
+}
+
+func (h *Handler) sign(w http.ResponseWriter, r *http.Request) {
+	var req signReq
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	signature, err := h.mgr.Sign(req.Message)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	resp := signResp{
+		signature,
+	}
+	if err := json.NewEncoder(w).Encode(resp); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+type verifyReq struct {
+	Message   []byte `json:"message"`
+	Signature []byte `json:"signature"`
+}
+
+func (h *Handler) verify(w http.ResponseWriter, r *http.Request) {
+	var req verifyReq
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, err.Error(), http.StatusBadRequest)
+		return
+	}
+	valid, err := h.mgr.VerifySignature(req.Message, req.Signature)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	if !valid {
+		http.Error(w, "Signature could not be verified", http.StatusBadRequest)
+		return
+	}
+}
+
 func main() {
 	flag.Parse()
 	cfg, err := clientcmd.BuildConfigFromFlags(*masterURL, *kubeConfig)
@@ -209,12 +176,17 @@
 	mgr := Manager{
 		kubeClient:   kubeClient,
 		nebulaClient: nebulaClient,
+		namespace:    *namespace,
+		caSecretName: *caSecretName,
 	}
 	handler := Handler{
 		mgr:   mgr,
 		tmpls: t,
 	}
 	r := mux.NewRouter()
+	r.HandleFunc("/api/ip", handler.getNextIP)
+	r.HandleFunc("/api/sign", handler.sign)
+	r.HandleFunc("/api/verify", handler.verify)
 	r.HandleFunc("/node/{namespace:[a-zA-z0-9-]+}/{name:[a-zA-z0-9-]+}", handler.handleNode)
 	r.HandleFunc("/ca/{namespace:[a-zA-z0-9-]+}/{name:[a-zA-z0-9-]+}", handler.handleCA)
 	r.HandleFunc("/sign-node", handler.handleSignNode)
diff --git a/core/nebula/api/manager.go b/core/nebula/api/manager.go
new file mode 100644
index 0000000..40f6eeb
--- /dev/null
+++ b/core/nebula/api/manager.go
@@ -0,0 +1,163 @@
+package main
+
+import (
+	"context"
+	"crypto"
+	"crypto/ed25519"
+	"crypto/rand"
+	"errors"
+	"fmt"
+
+	"inet.af/netaddr"
+
+	"github.com/slackhq/nebula/cert"
+
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+
+	nebulav1 "github.com/giolekva/pcloud/core/nebula/controller/apis/nebula/v1"
+	clientset "github.com/giolekva/pcloud/core/nebula/controller/generated/clientset/versioned"
+)
+
+type nebulaCA struct {
+	Name      string
+	Namespace string
+	Nodes     []nebulaNode
+}
+
+type nebulaNode struct {
+	Name      string
+	Namespace string
+	IP        string
+}
+
+type Manager struct {
+	kubeClient   kubernetes.Interface
+	nebulaClient clientset.Interface
+	namespace    string
+	caSecretName string
+}
+
+func (m *Manager) ListAll() ([]*nebulaCA, error) {
+	ret := make([]*nebulaCA, 0)
+	cas, err := m.nebulaClient.LekvaV1().NebulaCAs("").List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	for _, ca := range cas.Items {
+		ret = append(ret, &nebulaCA{
+			Name:      ca.Name,
+			Namespace: ca.Namespace,
+			Nodes:     make([]nebulaNode, 0),
+		})
+	}
+	nodes, err := m.nebulaClient.LekvaV1().NebulaNodes("").List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return nil, err
+	}
+	for _, node := range nodes.Items {
+		for _, ca := range ret {
+			if ca.Name == node.Spec.CAName {
+				ca.Nodes = append(ca.Nodes, nebulaNode{
+					Name:      node.Name,
+					Namespace: node.Namespace,
+					IP:        node.Spec.IPCidr,
+				})
+			}
+		}
+	}
+	return ret, nil
+}
+
+func (m *Manager) CreateNode(namespace, name, caNamespace, caName, ipCidr, pubKey string) (string, string, error) {
+	node := &nebulav1.NebulaNode{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: namespace,
+		},
+		Spec: nebulav1.NebulaNodeSpec{
+			CAName:      caName,
+			CANamespace: caNamespace,
+			IPCidr:      ipCidr,
+			PubKey:      pubKey,
+			SecretName:  fmt.Sprintf("%s-cert", name),
+		},
+	}
+	node, err := m.nebulaClient.LekvaV1().NebulaNodes(namespace).Create(context.TODO(), node, metav1.CreateOptions{})
+	if err != nil {
+		return "", "", err
+	}
+	return node.Namespace, node.Name, nil
+}
+
+func (m *Manager) GetNodeCertQR(namespace, name string) ([]byte, error) {
+	secret, err := m.getNodeSecret(namespace, name)
+	if err != nil {
+		return nil, err
+	}
+	return secret.Data["host.png"], nil
+}
+
+func (m *Manager) GetCACertQR(namespace, name string) ([]byte, error) {
+	ca, err := m.nebulaClient.LekvaV1().NebulaCAs(namespace).Get(context.TODO(), name, metav1.GetOptions{})
+	if err != nil {
+		return nil, err
+	}
+	secret, err := m.kubeClient.CoreV1().Secrets(namespace).Get(context.TODO(), ca.Spec.SecretName, metav1.GetOptions{})
+	if err != nil {
+		return nil, err
+	}
+	return secret.Data["ca.png"], nil
+}
+
+func (m *Manager) getNextIP() (netaddr.IP, error) {
+	nodes, err := m.nebulaClient.LekvaV1().NebulaNodes(m.namespace).List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		return netaddr.IP{}, err
+	}
+	var max netaddr.IP
+	for _, node := range nodes.Items {
+		ip := netaddr.MustParseIPPrefix(node.Spec.IPCidr)
+		if max.Less(ip.IP()) {
+			max = ip.IP()
+		}
+	}
+	n := max.Next()
+	if n.IsZero() {
+		return n, errors.New("IP address range exhausted")
+	}
+	return n, nil
+}
+
+func (m *Manager) Sign(message []byte) ([]byte, error) {
+	secret, err := m.kubeClient.CoreV1().Secrets(m.namespace).Get(context.TODO(), m.caSecretName, metav1.GetOptions{})
+	if err != nil {
+		return nil, err
+	}
+	edPriv, _, err := cert.UnmarshalEd25519PrivateKey(secret.Data["ca.key"])
+	if err != nil {
+		return nil, err
+	}
+	return edPriv.Sign(rand.Reader, message, crypto.Hash(0))
+}
+
+func (m *Manager) VerifySignature(message, signature []byte) (bool, error) {
+	secret, err := m.kubeClient.CoreV1().Secrets(m.namespace).Get(context.TODO(), m.caSecretName, metav1.GetOptions{})
+	if err != nil {
+		return false, err
+	}
+	edPriv, _, err := cert.UnmarshalEd25519PrivateKey(secret.Data["ca.key"])
+	if err != nil {
+		return false, err
+	}
+	return ed25519.Verify(edPriv.Public().(ed25519.PublicKey), message, signature), nil
+}
+
+func (m *Manager) getNodeSecret(namespace, name string) (*corev1.Secret, error) {
+	node, err := m.nebulaClient.LekvaV1().NebulaNodes(namespace).Get(context.TODO(), name, metav1.GetOptions{})
+	if err != nil {
+		return nil, err
+	}
+	return m.kubeClient.CoreV1().Secrets(namespace).Get(context.TODO(), node.Spec.SecretName, metav1.GetOptions{})
+}