Merge branch 'feat_ui_improvements' into feat_ui_improvements

app/build.gradle

@@ -101,4 +101,11 @@ dependencies {
     implementation 'id.zelory:compressor:2.1.0'
     implementation 'com.vincent.filepicker:MultiTypeFilePicker:1.0.7'
     implementation 'com.andrognito.patternlockview:patternlockview:1.0.0'
+    implementation 'commons-codec:commons-codec:1.11'
+
+    implementation ('io.socket:socket.io-client:0.8.3') {
+        // excluding org.json which is provided by Android
+        exclude group: 'org.json', module: 'json'
+    }
+
 }

app/src/main/AndroidManifest.xml

@@ -55,6 +55,21 @@
         <activity android:name=".activities.PatternRequestActivity"
             android:noHistory="true">
         </activity>
+        <activity android:name=".activities.PocketRequestActivity"
+            android:noHistory="true">
+            <!--<meta-data
+                android:name="android.nfc.action.TECH_DISCOVERED"
+                android:resource="@xml/tech" />-->
+            <intent-filter>
+                <action android:name="android.nfc.action.NDEF_DISCOVERED"/>
+                <category android:name="android.intent.category.DEFAULT"/>
+                <data
+                    android:scheme="https"
+                    android:host="my.yubico.com"
+                    android:pathPrefix="/neo"/>
+            </intent-filter>
+
+        </activity>
         <activity android:name=".activities.CryptoNetAccountSettingsActivity"
             android:theme="@style/AppTheme.NoActionBar"
             android:windowSoftInputMode="adjustPan">

app/src/main/java/cy/agorise/crystalwallet/activities/IntroActivity.java

@@ -108,6 +108,7 @@ public class IntroActivity extends CustomActivity {
             } else {
                 //Intent intent = new Intent(this, CreateSeedActivity.class);
                 Intent intent = new Intent(this, BoardActivity.class);
+                //Intent intent = new Intent(this, PocketRequestActivity.class);
                 startActivity(intent);
             }
 

app/src/main/java/cy/agorise/crystalwallet/activities/PatternRequestActivity.java

@@ -18,6 +18,7 @@ import butterknife.BindView;
 import butterknife.ButterKnife;
 import butterknife.OnTextChanged;
 import cy.agorise.crystalwallet.R;
+import cy.agorise.crystalwallet.application.CrystalSecurityMonitor;
 import cy.agorise.crystalwallet.models.GeneralSetting;
 import cy.agorise.crystalwallet.util.PasswordManager;
 import cy.agorise.crystalwallet.viewmodels.GeneralSettingListViewModel;
@@ -69,7 +70,11 @@ public class PatternRequestActivity extends AppCompatActivity {
                                     @Override
                                     public void onComplete(List<PatternLockView.Dot> pattern) {
                                         if (PasswordManager.checkPassword(patternEncrypted,patternToString(pattern))){
+                                            if (CrystalSecurityMonitor.getInstance(null).is2ndFactorSet()) {
+                                                CrystalSecurityMonitor.getInstance(null).call2ndFactor(thisActivity);
+                                            } else {
                                                 thisActivity.finish();
+                                            }
                                         } else {
                                             patternLockView.clearPattern();
                                             patternLockView.requestFocus();

app/src/main/java/cy/agorise/crystalwallet/activities/PinRequestActivity.java

@@ -15,6 +15,8 @@ import butterknife.BindView;
 import butterknife.ButterKnife;
 import butterknife.OnTextChanged;
 import cy.agorise.crystalwallet.R;
+import cy.agorise.crystalwallet.application.CrystalSecurityMonitor;
+import cy.agorise.crystalwallet.models.AccountSeed;
 import cy.agorise.crystalwallet.models.GeneralSetting;
 import cy.agorise.crystalwallet.util.PasswordManager;
 import cy.agorise.crystalwallet.viewmodels.GeneralSettingListViewModel;
@@ -61,9 +63,13 @@ public class PinRequestActivity extends AppCompatActivity {
             callback = OnTextChanged.Callback.AFTER_TEXT_CHANGED)
     void afterPasswordChanged(Editable editable) {
         if (PasswordManager.checkPassword(passwordEncrypted, etPassword.getText().toString())) {
+            if (CrystalSecurityMonitor.getInstance(null).is2ndFactorSet()) {
+                CrystalSecurityMonitor.getInstance(null).call2ndFactor(this);
+            } else {
                 this.finish();
             }
         }
+    }
 }
 
 

app/src/main/java/cy/agorise/crystalwallet/activities/PocketRequestActivity.java

@@ -0,0 +1,144 @@
+package cy.agorise.crystalwallet.activities;
+
+import android.app.PendingIntent;
+import android.arch.lifecycle.LiveData;
+import android.arch.lifecycle.Observer;
+import android.arch.lifecycle.ViewModelProviders;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.nfc.NfcAdapter;
+import android.nfc.Tag;
+import android.nfc.tech.IsoDep;
+import android.nfc.tech.MifareClassic;
+import android.nfc.tech.NdefFormatable;
+import android.nfc.tech.NfcA;
+import android.nfc.tech.NfcF;
+import android.nfc.tech.NfcV;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.andrognito.patternlockview.PatternLockView;
+import com.andrognito.patternlockview.listener.PatternLockViewListener;
+
+import org.apache.commons.codec.binary.Base32;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+import java.util.List;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import cy.agorise.crystalwallet.R;
+import cy.agorise.crystalwallet.application.CrystalSecurityMonitor;
+import cy.agorise.crystalwallet.models.GeneralSetting;
+import cy.agorise.crystalwallet.util.PasswordManager;
+import cy.agorise.crystalwallet.util.yubikey.Algorithm;
+import cy.agorise.crystalwallet.util.yubikey.OathType;
+import cy.agorise.crystalwallet.util.yubikey.TOTP;
+import cy.agorise.crystalwallet.util.yubikey.YkOathApi;
+import cy.agorise.crystalwallet.viewmodels.GeneralSettingListViewModel;
+
+public class PocketRequestActivity extends AppCompatActivity {
+
+    private NfcAdapter mNfcAdapter;
+    private PendingIntent pendingIntent;
+    private IntentFilter ndef;
+    IntentFilter[] intentFiltersArray;
+    String[][] techList;
+
+    @Override
+    public void onBackPressed() {
+        //Do nothing to prevent the user to use the back button
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_pocket_request);
+        ButterKnife.bind(this);
+
+        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
+
+        this.configureForegroundDispatch();
+    }
+
+    public void configureForegroundDispatch(){
+        if (mNfcAdapter != null) {
+            pendingIntent = PendingIntent.getActivity(
+                    this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
+
+            ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
+            try {
+                ndef.addDataType("*/*");    /* Handles all MIME based dispatches.
+                                       You should specify only the ones that you need. */
+            } catch (IntentFilter.MalformedMimeTypeException e) {
+                throw new RuntimeException("fail", e);
+            }
+            intentFiltersArray = new IntentFilter[]{ndef,};
+            techList = new String[][]{ new String[] {IsoDep.class.getName(), NfcA.class.getName(), MifareClassic.class.getName(), NdefFormatable.class.getName()} };
+
+        } else {
+            Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
+        }
+    }
+
+    public void onPause() {
+        super.onPause();
+        if (mNfcAdapter != null) {
+            mNfcAdapter.disableForegroundDispatch(this);
+        }
+    }
+
+    public void onResume() {
+        super.onResume();
+        if (mNfcAdapter != null) {
+            mNfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFiltersArray, techList);
+        }
+    }
+
+    public void onNewIntent(Intent intent) {
+        Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+        IsoDep tagIsoDep = IsoDep.get(tagFromIntent);
+        Log.i("Tag from nfc","New Intent");
+        String yubikeySecret = CrystalSecurityMonitor.getInstance(null).get2ndFactorValue();
+
+        try {
+            tagIsoDep.connect();
+            YkOathApi ykOathApi = new YkOathApi(tagIsoDep);
+
+            long unixTime = System.currentTimeMillis() / 1000L;
+            byte[] timeStep = ByteBuffer.allocate(8).putLong(unixTime / 30L).array();
+            byte[] response;
+            response = ykOathApi.calculate("cy.agorise.crystalwallet",timeStep,true);
+            ByteBuffer responseBB = ByteBuffer.wrap(response);
+            int digits = (int)responseBB.get();
+            String challengeString = ""+(responseBB.getInt());
+            String challenge = challengeString.substring(challengeString.length()-digits);
+            while (challenge.length() < digits){
+                challenge = '0'+challenge;
+            }
+
+            String storedChallenge = PasswordManager.totpd(yubikeySecret, unixTime, ykOathApi.getDeviceSalt());
+
+            Toast.makeText(this, "Secret:"+yubikeySecret+" StoredChallenge:"+storedChallenge+" Yubikey:"+challenge , Toast.LENGTH_LONG).show();
+
+            Log.i("TOTP","Secret: "+yubikeySecret);
+            Log.i("TOTP", "Unixtime: "+unixTime);
+            Log.i("TOTP", "Step: "+unixTime/30L);
+            Log.i("TOTP", "StoredChallenge: "+storedChallenge);
+            Log.i("TOTP", "Yubikey: "+challenge);
+
+            tagIsoDep.close();
+            //ykOathApi.
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+}
+
+

app/src/main/java/cy/agorise/crystalwallet/activities/SettingsActivity.java

@@ -1,5 +1,6 @@
 package cy.agorise.crystalwallet.activities;
 
+import android.content.Intent;
 import android.media.MediaPlayer;
 import android.os.Bundle;
 import android.support.v4.app.Fragment;
@@ -47,6 +48,8 @@ public class SettingsActivity extends AppCompatActivity{
     @BindView(R.id.tvBuildVersion)
     public TextView tvBuildVersion;
 
+    private SecuritySettingsFragment securitySettingsFragment;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -97,7 +100,8 @@ public class SettingsActivity extends AppCompatActivity{
                 case 0:
                     return new GeneralSettingsFragment();
                 case 1:
-                    return new SecuritySettingsFragment();
+                    securitySettingsFragment = new SecuritySettingsFragment();
+                    return securitySettingsFragment;
                 case 2:
                     return new BackupsSettingsFragment();
                 //case 3:
@@ -123,4 +127,12 @@ public class SettingsActivity extends AppCompatActivity{
     public void goBack(){
         onBackPressed();
     }
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        if (this.securitySettingsFragment != null){
+            this.securitySettingsFragment.onNewIntent(intent);
+        }
+    }
 }

app/src/main/java/cy/agorise/crystalwallet/apigenerator/BitsharesFaucetApiGenerator.java

@@ -7,6 +7,7 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.TimeUnit;
 
+import io.reactivex.Observable;
 import okhttp3.Interceptor;
 import okhttp3.OkHttpClient;
 import okhttp3.logging.HttpLoggingInterceptor;
@@ -217,8 +218,9 @@ public abstract class BitsharesFaucetApiGenerator {
 
     public interface IWebService {
         @Headers({"Content-Type: application/json"})
-        @POST("/api/v1/accounts")
+        @POST("/faucet/api/v1/accounts")
         Call<RegisterAccountResponse> getReg(@Body Map<String, HashMap> params);
+
     }
 
     public class RegisterAccountResponse {

app/src/main/java/cy/agorise/crystalwallet/apigenerator/GrapheneApiGenerator.java

@@ -610,7 +610,7 @@ public abstract class GrapheneApiGenerator {
                     public void onError(BaseResponse.Error error) {
                         request.getListener().fail(request.getId());
                     }
-                }), BitsharesConstant.EQUIVALENT_URL); //todo change equivalent url for current server url
+                }), CryptoNetManager.getURL(CryptoNet.BITSHARES)); //todo change equivalent url for current server url
         thread.start();
     }
 
@@ -626,7 +626,7 @@ public abstract class GrapheneApiGenerator {
         for (BitsharesAsset quoteAsset : quoteAssets) {
             WebSocketThread thread = new WebSocketThread(new GetLimitOrders(baseAsset.getBitsharesId(),
                     quoteAsset.getBitsharesId(), 10, new EquivalentValueListener(baseAsset,
-                    quoteAsset, context)), BitsharesConstant.EQUIVALENT_URL); //todo change equivalent url for current server url
+                    quoteAsset, context)), CryptoNetManager.getURL(CryptoNet.BITSHARES)); //todo change equivalent url for current server url
             thread.start();
         }
     }

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/AccountActivityWatcher.java

@@ -0,0 +1,160 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import android.content.Context;
+
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import cy.agorise.crystalwallet.models.GeneralCoinAccount;
+import io.socket.client.IO;
+import io.socket.client.Socket;
+import io.socket.emitter.Emitter;
+
+/**
+ * Handles all the calls for the Socket.IO of the insight api
+ *
+ * Only gets new transaction in real time for each address of an Account
+ *
+ */
+
+public class AccountActivityWatcher {
+
+    /**
+     * The mAccount to be monitor
+     */
+    private final GeneralCoinAccount mAccount;
+    /**
+     * The list of address to monitor
+     */
+    private List<String> mWatchAddress = new ArrayList<>();
+    /**
+     * the Socket.IO
+     */
+    private Socket mSocket;
+    /**
+     * This app mContext, used to save on the DB
+     */
+    private final Context mContext;
+
+    /**
+     * Handles the address/transaction notification.
+     * Then calls the GetTransactionData to get the info of the new transaction
+     */
+    private final Emitter.Listener onAddressTransaction = new Emitter.Listener() {
+        @Override
+        public void call(Object... os) {
+            try {
+                System.out.println("Receive accountActivtyWatcher " + os[0].toString() );
+                String txid = ((JSONObject) os[0]).getString(InsightApiConstants.sTxTag);
+                new GetTransactionData(txid, mAccount, mContext).start();
+            } catch (JSONException ex) {
+                Logger.getLogger(AccountActivityWatcher.class.getName()).log(Level.SEVERE, null, ex);
+            }
+        }
+    };
+
+    /**
+     * Handles the connect of the Socket.IO
+     */
+    private final Emitter.Listener onConnect = new Emitter.Listener() {
+        @Override
+        public void call(Object... os) {
+            System.out.println("Connected to accountActivityWatcher");
+            JSONArray array = new JSONArray();
+            for(String addr : mWatchAddress) {
+                array.put(addr);
+            }
+            mSocket.emit(InsightApiConstants.sSubscribeEmmit, InsightApiConstants.sChangeAddressRoom, array);
+        }
+    };
+
+    /**
+     * Handles the disconnect of the Socket.Io
+     * Reconcects the mSocket
+     */
+    private final Emitter.Listener onDisconnect = new Emitter.Listener() {
+        @Override
+        public void call(Object... os) {
+            System.out.println("Disconnected to accountActivityWatcher");
+            mSocket.connect();
+        }
+    };
+
+    /**
+     * Error handler, doesn't need reconnect, the mSocket.io do that by default
+     */
+    private final Emitter.Listener onError = new Emitter.Listener() {
+        @Override
+        public void call(Object... os) {
+            System.out.println("Error to accountActivityWatcher ");
+            for(Object ob : os) {
+                System.out.println("accountActivityWatcher " + ob.toString());
+            }
+        }
+    };
+
+    /**
+     * Basic constructor
+     *
+     * @param mAccount The mAccount to be monitor
+     * @param mContext This app mContext
+     */
+    public AccountActivityWatcher(GeneralCoinAccount mAccount, Context mContext) {
+        //String serverUrl = InsightApiConstants.protocol + "://" + InsightApiConstants.getAddress(mAccount.getCoin()) + ":" + InsightApiConstants.getPort(mAccount.getCoin()) + "/"+InsightApiConstants.getRawPath(mAccount.getCoin())+"/mSocket.io/";
+        String serverUrl = InsightApiConstants.sProtocolSocketIO + "://" + InsightApiConstants.getAddress(mAccount.getCryptoCoin()) + ":" + InsightApiConstants.getPort(mAccount.getCryptoCoin()) + "/";
+        this.mAccount = mAccount;
+        this.mContext = mContext;
+        System.out.println("accountActivityWatcher " + serverUrl);
+        try {
+            IO.Options opts = new IO.Options();
+            System.out.println("accountActivityWatcher default path " + opts.path);
+            this.mSocket = IO.socket(serverUrl);
+            this.mSocket.on(Socket.EVENT_CONNECT, onConnect);
+            this.mSocket.on(Socket.EVENT_DISCONNECT, onDisconnect);
+            this.mSocket.on(Socket.EVENT_ERROR, onError);
+            this.mSocket.on(Socket.EVENT_CONNECT_ERROR, onError);
+            this.mSocket.on(Socket.EVENT_CONNECT_TIMEOUT, onError);
+            this.mSocket.on(InsightApiConstants.sChangeAddressRoom, onAddressTransaction);
+        } catch (URISyntaxException e) {
+            //TODO change exception handler
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Add an address to be monitored, it can be used after the connect
+     * @param address The String address to monitor
+     */
+    public void addAddress(String address) {
+        mWatchAddress.add(address);
+        if (this.mSocket.connected()) {
+            mSocket.emit(InsightApiConstants.sSubscribeEmmit, InsightApiConstants.sChangeAddressRoom, new String[]{address});
+        }
+    }
+
+    /**
+     * Connects the Socket
+     */
+    public void connect() {
+        //TODO change to use log
+        System.out.println("accountActivityWatcher connecting");
+        try{
+            this.mSocket.connect();
+        }catch(Exception e){
+            //TODO change exception handler
+            System.out.println("accountActivityWatcher exception " + e.getMessage());
+        }
+    }
+
+    /**
+     * Disconnects the Socket
+     */
+    public void disconnect() {this.mSocket.disconnect();}
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/BroadcastTransaction.java

@@ -0,0 +1,83 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import android.content.Context;
+
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Txi;
+import cy.agorise.crystalwallet.models.GeneralCoinAccount;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+/**
+ * Broadcast a transaction, using the InsightApi
+ *
+ */
+
+public class BroadcastTransaction extends Thread implements Callback<Txi> {
+    /**
+     * The rawTX as Hex String
+     */
+    private String mRawTx;
+    /**
+     * The serviceGenerator to call
+     */
+    private InsightApiServiceGenerator mServiceGenerator;
+    /**
+     * This app context, used to save on the DB
+     */
+    private Context mContext;
+    /**
+     * The account who sign the transaction
+     */
+    private GeneralCoinAccount mAccount;
+
+    /**
+     * Basic Consturctor
+     * @param RawTx The RawTX in Hex String
+     * @param account The account who signs the transaction
+     * @param context This app context
+     */
+    public BroadcastTransaction(String RawTx, GeneralCoinAccount account, Context context){
+        String serverUrl = InsightApiConstants.sProtocol + "://" + InsightApiConstants.getAddress(account.getCryptoCoin()) +"/";
+        this.mServiceGenerator = new InsightApiServiceGenerator(serverUrl);
+        this.mContext = context;
+        this.mRawTx = RawTx;
+        this.mAccount = account;
+    }
+
+    /**
+     * Handles the response of the call
+     *
+     */
+    @Override
+    public void onResponse(Call<Txi> call, Response<Txi> response) {
+        if (response.isSuccessful()) {
+            //TODO invalidated send
+            //TODO call getTransactionData
+            GetTransactionData trData = new GetTransactionData(response.body().txid,this.mAccount,this.mContext);
+            trData.start();
+        } else {
+            System.out.println("SENDTEST: not succesful " + response.message());
+            //TODO change how to handle invalid transaction
+        }
+    }
+
+    /**
+     * Handles the failures of the call
+     */
+    @Override
+    public void onFailure(Call<Txi> call, Throwable t) {
+        //TODO change how to handle invalid transaction
+        System.out.println("SENDTEST: sendError " + t.getMessage() );
+    }
+
+    /**
+     * Starts the call of the service
+     */
+    @Override
+    public void run() {
+        InsightApiService service = this.mServiceGenerator.getService(InsightApiService.class);
+        Call<Txi> broadcastTransaction = service.broadcastTransaction(InsightApiConstants.getPath(this.mAccount.getCryptoCoin()),this.mRawTx);
+        broadcastTransaction.enqueue(this);
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/GetEstimateFee.java

@@ -0,0 +1,74 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import com.google.gson.JsonObject;
+
+import java.io.IOException;
+
+import cy.agorise.crystalwallet.enums.CryptoCoin;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+/**
+ * Get the estimete fee amount from an insight api server.
+ * This class gets the rate of the fee for a giving coin in about to block for a transaction to be
+ * confirmated.
+ *
+ * This ammount is giving as amount of currency / kbytes,  as example btc / kbytes
+ *
+  */
+
+public abstract class GetEstimateFee {
+
+    //TODO add a funciton to get the rate of a specific port
+
+    /**
+     * The funciton to get the rate for the transaction be included in the next 2 blocks
+     * @param coin The coin to get the rate
+     * @return The rate number (coin/kbytes)
+     * @throws IOException If the server answer null, or the rate couldn't be calculated
+     */
+    public static long getEstimateFee(final CryptoCoin coin) throws IOException {
+        String serverUrl = InsightApiConstants.sProtocol + "://"
+                + InsightApiConstants.getAddress(coin) + "/";
+        InsightApiServiceGenerator serviceGenerator = new InsightApiServiceGenerator(serverUrl);
+        InsightApiService service = serviceGenerator.getService(InsightApiService.class);
+        Call<JsonObject> call = service.estimateFee(InsightApiConstants.getPath(coin));
+        final Object SYNC = new Object();
+        final JsonObject answer = new JsonObject();
+        call.enqueue(new Callback<JsonObject>() {
+            @Override
+            public void onResponse(Call<JsonObject> call, Response<JsonObject> response) {
+                synchronized (SYNC) {
+                    answer.addProperty("answer",
+                            (long) (response.body().get("2").getAsDouble()* Math.pow(10, coin.getPrecision())));
+                    SYNC.notifyAll();
+                }
+            }
+
+            @Override
+            public void onFailure(Call<JsonObject> call, Throwable t) {
+                synchronized (SYNC) {
+                    SYNC.notifyAll();
+                }
+            }
+        });
+        synchronized (SYNC){
+            for(int i = 0; i < 6; i++) {
+                try {
+                    SYNC.wait(5000);
+                } catch (InterruptedException e) {
+                    // this interruption never rises
+                }
+                if(answer.get("answer")!=null){
+                    break;
+                }
+            }
+        }
+        if(answer.get("answer")==null){
+            throw new IOException("");
+        }
+        return (long) (answer.get("answer").getAsDouble());
+    }
+
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/GetTransactionByAddress.java

@@ -0,0 +1,207 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import android.content.Context;
+import android.util.Log;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.AddressTxi;
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Txi;
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Vin;
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Vout;
+import cy.agorise.crystalwallet.models.GTxIO;
+import cy.agorise.crystalwallet.models.GeneralCoinAccount;
+import cy.agorise.crystalwallet.models.GeneralCoinAddress;
+import cy.agorise.crystalwallet.models.GeneralTransaction;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+/**
+ * Get all the transaction data of the addresses of an account
+ *
+ */
+
+public class GetTransactionByAddress extends Thread implements Callback<AddressTxi> {
+    /**
+     * The account to be query
+     */
+    private GeneralCoinAccount mAccount;
+    /**
+     * The list of address to query
+     */
+    private List<GeneralCoinAddress> mAddresses = new ArrayList<>();
+    /**
+     * The serviceGenerator to call
+     */
+    private InsightApiServiceGenerator mServiceGenerator;
+    /**
+     * This app context, used to save on the DB
+     */
+    private Context mContext;
+
+
+    /**
+     * Basic consturcotr
+     * @param account The account to be query
+     * @param context This app context
+     */
+    public GetTransactionByAddress(GeneralCoinAccount account, Context context) {
+        String serverUrl = InsightApiConstants.sProtocol + "://" + InsightApiConstants.getAddress(account.getCryptoCoin()) +"/";
+        this.mAccount = account;
+        this.mServiceGenerator = new InsightApiServiceGenerator(serverUrl);
+        this.mContext = context;
+    }
+
+    /**
+     * add an address to be query
+     * @param address the address to be query
+     */
+    public void addAddress(GeneralCoinAddress address) {
+        this.mAddresses.add(address);
+    }
+
+
+    /**
+     * Handle the response
+     * @param call The call with the addresTxi object
+     * @param response the response status object
+     */
+    @Override
+    public void onResponse(Call<AddressTxi> call, Response<AddressTxi> response) {
+        if (response.isSuccessful()) {
+            boolean changed = false;
+            AddressTxi addressTxi = response.body();
+
+            for (Txi txi : addressTxi.items) {
+                GeneralCoinAccount tempAccount = null;
+                GeneralTransaction transaction = new GeneralTransaction();
+                transaction.setAccount(this.mAccount);
+                transaction.setTxid(txi.txid);
+                transaction.setBlock(txi.blockheight);
+                transaction.setDate(new Date(txi.time * 1000));
+                transaction.setFee((long) (txi.fee * Math.pow(10,this.mAccount.getCryptoCoin().getPrecision())));
+                transaction.setConfirm(txi.confirmations);
+                transaction.setType(this.mAccount.getCryptoCoin());
+                transaction.setBlockHeight(txi.blockheight);
+
+                for (Vin vin : txi.vin) {
+                    GTxIO input = new GTxIO();
+                    input.setAmount((long) (vin.value * Math.pow(10,this.mAccount.getCryptoCoin().getPrecision())));
+                    input.setTransaction(transaction);
+                    input.setOut(true);
+                    input.setType(this.mAccount.getCryptoCoin());
+                    String addr = vin.addr;
+                    input.setAddressString(addr);
+                    input.setIndex(vin.n);
+                    input.setScriptHex(vin.scriptSig.hex);
+                    input.setOriginalTxid(vin.txid);
+                    for (GeneralCoinAddress address : this.mAddresses) {
+                        if (address.getAddressString(this.mAccount.getNetworkParam()).equals(addr)) {
+                            input.setAddress(address);
+                            tempAccount = address.getAccount();
+
+                            if (!address.hasTransactionOutput(input, this.mAccount.getNetworkParam())) {
+                                address.getTransactionOutput().add(input);
+                            }
+                            changed = true;
+                        }
+                    }
+                    transaction.getTxInputs().add(input);
+                }
+
+                for (Vout vout : txi.vout) {
+                    if(vout.scriptPubKey.addresses == null || vout.scriptPubKey.addresses.length <= 0){
+                        // The address is null, this must be a memo
+                        String hex = vout.scriptPubKey.hex;
+                        int opReturnIndex = hex.indexOf("6a");
+                        if(opReturnIndex >= 0) {
+                            byte[] memoBytes = new byte[Integer.parseInt(hex.substring(opReturnIndex+2,opReturnIndex+4),16)];
+                            for(int i = 0; i < memoBytes.length;i++){
+                                memoBytes[i] = Byte.parseByte(hex.substring(opReturnIndex+4+(i*2),opReturnIndex+6+(i*2)),16);
+                            }
+                            transaction.setMemo(new String(memoBytes));
+                        }
+                    }else {
+                        GTxIO output = new GTxIO();
+                        output.setAmount((long) (vout.value * Math.pow(10, this.mAccount.getCryptoCoin().getPrecision())));
+                        output.setTransaction(transaction);
+                        output.setOut(false);
+                        output.setType(this.mAccount.getCryptoCoin());
+                        String addr = vout.scriptPubKey.addresses[0];
+                        output.setAddressString(addr);
+                        output.setIndex(vout.n);
+                        output.setScriptHex(vout.scriptPubKey.hex);
+                        for (GeneralCoinAddress address : this.mAddresses) {
+                            if (address.getAddressString(this.mAccount.getNetworkParam()).equals(addr)) {
+                                output.setAddress(address);
+                                tempAccount = address.getAccount();
+
+                                if (!address.hasTransactionInput(output, this.mAccount.getNetworkParam())) {
+                                    address.getTransactionInput().add(output);
+                                }
+                                changed = true;
+                            }
+                        }
+
+                        transaction.getTxOutputs().add(output);
+                    }
+                }
+                if(txi.txlock && txi.confirmations< this.mAccount.getCryptoNet().getConfirmationsNeeded()){
+                    transaction.setConfirm(this.mAccount.getCryptoNet().getConfirmationsNeeded());
+                }
+                //TODO database
+                /*SCWallDatabase db = new SCWallDatabase(this.mContext);
+                long idTransaction = db.getGeneralTransactionId(transaction);
+                if (idTransaction == -1) {
+                    db.putGeneralTransaction(transaction);
+                } else {
+                    transaction.setId(idTransaction);
+                    db.updateGeneralTransaction(transaction);
+                }*/
+
+                if (tempAccount != null && transaction.getConfirm() < this.mAccount.getCryptoNet().getConfirmationsNeeded()) {
+                    new GetTransactionData(transaction.getTxid(), tempAccount, this.mContext, true).start();
+                }
+                for (GeneralCoinAddress address : this.mAddresses) {
+                    if (address.updateTransaction(transaction)) {
+                        break;
+                    }
+                }
+            }
+
+            if(changed) {
+                this.mAccount.balanceChange();
+            }
+        }
+    }
+
+    /**
+     * Failure of the call
+     * @param call The call object
+     * @param t The reason for the failure
+     */
+    @Override
+    public void onFailure(Call<AddressTxi> call, Throwable t) {
+        Log.e("GetTransactionByAddress", "Error in json format");
+    }
+
+    /**
+     * Function to start the insight api call
+     */
+    @Override
+    public void run() {
+        if (this.mAddresses.size() > 0) {
+            StringBuilder addressToQuery = new StringBuilder();
+            for (GeneralCoinAddress address : this.mAddresses) {
+                addressToQuery.append(address.getAddressString(this.mAccount.getNetworkParam())).append(",");
+            }
+            addressToQuery.deleteCharAt(addressToQuery.length() - 1);
+            InsightApiService service = this.mServiceGenerator.getService(InsightApiService.class);
+            Call<AddressTxi> addressTxiCall = service.getTransactionByAddress(InsightApiConstants.getPath(this.mAccount.getCryptoCoin()),addressToQuery.toString());
+            addressTxiCall.enqueue(this);
+        }
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/GetTransactionData.java

@@ -0,0 +1,196 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import android.content.Context;
+
+import java.util.Date;
+
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Txi;
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Vin;
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Vout;
+import cy.agorise.crystalwallet.models.GTxIO;
+import cy.agorise.crystalwallet.models.GeneralCoinAccount;
+import cy.agorise.crystalwallet.models.GeneralCoinAddress;
+import cy.agorise.crystalwallet.models.GeneralTransaction;
+import retrofit2.Call;
+import retrofit2.Callback;
+import retrofit2.Response;
+
+/**
+ * CThis class retrieve the data of a single transaction
+ */
+
+public class GetTransactionData extends Thread implements Callback<Txi> {
+    /**
+     * The account to be query
+     */
+    private final GeneralCoinAccount mAccount;
+    /**
+     * The transaction txid to be query
+     */
+    private String mTxId;
+    /**
+     * The serviceGenerator to call
+     */
+    private InsightApiServiceGenerator mServiceGenerator;
+    /**
+     * This app context, used to save on the DB
+     */
+    private Context mContext;
+    /**
+     * If has to wait for another confirmation
+     */
+    private boolean mMustWait = false;
+
+    /**
+     * Constructor used to query for a transaction with unknown confirmations
+     * @param txid The txid of the transaciton to be query
+     * @param account The account to be query
+     * @param context This app Context
+     */
+    public GetTransactionData(String txid, GeneralCoinAccount account, Context context) {
+        this(txid, account, context, false);
+    }
+
+    /**
+     * Consturctor to be used qhen the confirmations of the transaction are known
+     * @param txid The txid of the transaciton to be query
+     * @param account The account to be query
+     * @param context This app Context
+     * @param mustWait If there is less confirmation that needed
+     */
+    public GetTransactionData(String txid, GeneralCoinAccount account, Context context, boolean mustWait) {
+        String serverUrl = InsightApiConstants.sProtocol + "://" + InsightApiConstants.getAddress(account.getCryptoCoin()) +"/";
+        this.mAccount = account;
+        this.mTxId= txid;
+        this.mServiceGenerator = new InsightApiServiceGenerator(serverUrl);
+        this.mContext = context;
+        this.mMustWait = mustWait;
+    }
+
+    /**
+     * Function to start the insight api call
+     */
+    @Override
+    public void run() {
+        if (this.mMustWait) {
+            //We are waiting for confirmation
+            try {
+                Thread.sleep(InsightApiConstants.sWaitTime);
+            } catch (InterruptedException ignored) {
+                //TODO this exception never rises
+            }
+        }
+
+        InsightApiService service = this.mServiceGenerator.getService(InsightApiService.class);
+        Call<Txi> txiCall = service.getTransaction(InsightApiConstants.getPath(this.mAccount.getCryptoCoin()),this.mTxId);
+        txiCall.enqueue(this);
+    }
+
+    @Override
+    public void onResponse(Call<Txi> call, Response<Txi> response) {
+        if (response.isSuccessful()) {
+            Txi txi = response.body();
+
+            GeneralTransaction transaction = new GeneralTransaction();
+            transaction.setAccount(this.mAccount);
+            transaction.setTxid(txi.txid);
+            transaction.setBlock(txi.blockheight);
+            transaction.setDate(new Date(txi.time * 1000));
+            transaction.setFee((long) (txi.fee * Math.pow(10,this.mAccount.getCryptoCoin().getPrecision())));
+            transaction.setConfirm(txi.confirmations);
+            transaction.setType(this.mAccount.getCryptoCoin());
+            transaction.setBlockHeight(txi.blockheight);
+
+            for (Vin vin : txi.vin) {
+                GTxIO input = new GTxIO();
+                input.setAmount((long) (vin.value * Math.pow(10,this.mAccount.getCryptoCoin().getPrecision())));
+                input.setTransaction(transaction);
+                input.setOut(true);
+                input.setType(this.mAccount.getCryptoCoin());
+                String addr = vin.addr;
+                input.setAddressString(addr);
+                input.setIndex(vin.n);
+                input.setScriptHex(vin.scriptSig.hex);
+                input.setOriginalTxid(vin.txid);
+                for (GeneralCoinAddress address : this.mAccount.getAddresses()) {
+                    if (address.getAddressString(this.mAccount.getNetworkParam()).equals(addr)) {
+                        input.setAddress(address);
+                        if (!address.hasTransactionOutput(input, this.mAccount.getNetworkParam())) {
+                            address.getTransactionOutput().add(input);
+                        }
+                    }
+                }
+                transaction.getTxInputs().add(input);
+            }
+
+            for (Vout vout : txi.vout) {
+                if(vout.scriptPubKey.addresses == null || vout.scriptPubKey.addresses.length <= 0){
+                    // The address is null, this must be a memo
+                    String hex = vout.scriptPubKey.hex;
+                    int opReturnIndex = hex.indexOf("6a");
+                    if(opReturnIndex >= 0) {
+                        byte[] memoBytes = new byte[Integer.parseInt(hex.substring(opReturnIndex+2,opReturnIndex+4),16)];
+                        for(int i = 0; i < memoBytes.length;i++){
+                            memoBytes[i] = Byte.parseByte(hex.substring(opReturnIndex+4+(i*2),opReturnIndex+6+(i*2)),16);
+                        }
+                        transaction.setMemo(new String(memoBytes));
+                        System.out.println("Memo read : " + transaction.getMemo()); //TODO log this line
+                    }
+
+                }else {
+                    GTxIO output = new GTxIO();
+                    output.setAmount((long) (vout.value * Math.pow(10, this.mAccount.getCryptoCoin().getPrecision())));
+                    output.setTransaction(transaction);
+                    output.setOut(false);
+                    output.setType(this.mAccount.getCryptoCoin());
+                    String addr = vout.scriptPubKey.addresses[0];
+                    output.setAddressString(addr);
+                    output.setIndex(vout.n);
+                    output.setScriptHex(vout.scriptPubKey.hex);
+                    for (GeneralCoinAddress address : this.mAccount.getAddresses()) {
+                        if (address.getAddressString(this.mAccount.getNetworkParam()).equals(addr)) {
+                            output.setAddress(address);
+                            if (!address.hasTransactionInput(output, this.mAccount.getNetworkParam())) {
+                                address.getTransactionInput().add(output);
+                            }
+                        }
+                    }
+                    transaction.getTxOutputs().add(output);
+                }
+            }
+
+            // This is for features like dash instantSend
+            if(txi.txlock && txi.confirmations< this.mAccount.getCryptoNet().getConfirmationsNeeded()){
+                transaction.setConfirm(this.mAccount.getCryptoNet().getConfirmationsNeeded());
+            }
+
+            //TODO database
+            /*SCWallDatabase db = new SCWallDatabase(this.mContext);
+            long idTransaction = db.getGeneralTransactionId(transaction);
+            if (idTransaction == -1) {
+                db.putGeneralTransaction(transaction);
+            } else {
+                transaction.setId(idTransaction);
+                db.updateGeneralTransaction(transaction);
+            }*/
+
+            this.mAccount.updateTransaction(transaction);
+            this.mAccount.balanceChange();
+
+            if (transaction.getConfirm() < this.mAccount.getCryptoNet().getConfirmationsNeeded()) {
+                //If transaction weren't confirmed, add the transaction to watch for change on the confirmations
+                new GetTransactionData(this.mTxId, this.mAccount, this.mContext, true).start();
+            }
+        }
+    }
+
+    /**
+     * TODO handle the failure response
+     * @param call the Call object
+     * @param t the reason of the failure
+     */
+    @Override
+    public void onFailure(Call<Txi> call, Throwable t) {
+
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/InsightApiConstants.java

@@ -0,0 +1,116 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import java.util.HashMap;
+
+import cy.agorise.crystalwallet.enums.CryptoCoin;
+
+/**
+ * Class holds all constant related to the Insight Api
+ *
+ */
+
+abstract class InsightApiConstants {
+    /**
+     * Protocol of the insight api calls
+     */
+    static final String sProtocol = "https";
+    /**
+     * Protocol of the insigiht api Socket.IO connection
+     */
+    static final String sProtocolSocketIO = "http";
+    /**
+     * Contains each url information for each coin
+     */
+    private static final HashMap<CryptoCoin,AddressPort> sServerAddressPort = new HashMap<>();
+    /**
+     * Insight api Socket.IO new transaction by address notification
+     */
+    static final String sChangeAddressRoom = "bitcoind/addresstxid";
+    /**
+     * Socket.io subscribe command
+     */
+    static final String sSubscribeEmmit = "subscribe";
+    /**
+     * Tag used in the response of the address transaction notification
+     */
+    static final String sTxTag = "txid";
+
+    /**
+     * Wait time to check for confirmations
+     */
+    static long sWaitTime = (30 * 1000); //wait 1 minute
+
+    //Filled the serverAddressPort maps with static data
+     static{
+        //serverAddressPort.put(Coin.BITCOIN,new AddressPort("fr.blockpay.ch",3002,"node/btc/testnet","insight-api"));
+        sServerAddressPort.put(CryptoCoin.BITCOIN,new AddressPort("fr.blockpay.ch",3003,"node/btc/testnet","insight-api"));
+        //serverAddressPort.put(Coin.BITCOIN_TEST,new AddressPort("fr.blockpay.ch",3003,"node/btc/testnet","insight-api"));
+        sServerAddressPort.put(CryptoCoin.LITECOIN,new AddressPort("fr.blockpay.ch",3009,"node/ltc","insight-lite-api"));
+        sServerAddressPort.put(CryptoCoin.DASH,new AddressPort("fr.blockpay.ch",3005,"node/dash","insight-api-dash"));
+        sServerAddressPort.put(CryptoCoin.DOGECOIN,new AddressPort("fr.blockpay.ch",3006,"node/dogecoin","insight-api"));
+    }
+
+    /**
+     * Get the insight api server address
+     * @param coin The coin of the API to find
+     * @return The String address of the server, can be a name or the IP
+     */
+    static String getAddress(CryptoCoin coin){
+        return sServerAddressPort.get(coin).mServerAddress;
+    }
+
+    /**
+     * Get the port of the server Insight API
+     * @param coin The coin of the API to find
+     * @return The server number port
+     */
+    static int getPort(CryptoCoin coin){
+        return sServerAddressPort.get(coin).mPort;
+    }
+
+    /**
+     * Get the url path of the server Insight API
+     * @param coin The coin of the API to find
+     * @return The path of the Insight API
+     */
+    static String getPath(CryptoCoin coin){
+        return sServerAddressPort.get(coin).mPath + "/" + sServerAddressPort.get(coin).mInsightPath;
+    }
+
+    /**
+     * Contains all the url info neccessary to connects to the insight api
+     */
+    private static class AddressPort{
+        /**
+         * The server address
+         */
+        final String mServerAddress;
+        /**
+         * The port used in the Socket.io
+         */
+        final int mPort;
+        /**
+         * The path of the coin server
+         */
+        final String mPath;
+        /**
+         * The path of the insight api
+         */
+        final String mInsightPath;
+
+
+        /**
+         * Constructor
+         * @param serverAddress The server address of the Insight API
+         * @param port the port number of the Insight API
+         * @param path the path to the Insight API before the last /
+         * @param insightPath the path after the last / of the Insight API
+         */
+        AddressPort(String serverAddress, int port, String path, String insightPath) {
+            this.mServerAddress = serverAddress;
+            this.mPort = port;
+            this.mPath = path;
+            this.mInsightPath = insightPath;
+        }
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/InsightApiService.java

@@ -0,0 +1,52 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import com.google.gson.JsonObject;
+
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.AddressTxi;
+import cy.agorise.crystalwallet.apigenerator.insightapi.models.Txi;
+import retrofit2.Call;
+import retrofit2.http.Field;
+import retrofit2.http.FormUrlEncoded;
+import retrofit2.http.GET;
+import retrofit2.http.POST;
+import retrofit2.http.Path;
+
+/**
+ * Holds each call to the insigh api server
+ */
+
+interface InsightApiService {
+
+    /**
+     * The query for the info of a single transaction
+     * @param path The path of the insight api without the server address
+     * @param txid the transasction to be query
+     */
+    @GET("{path}/tx/{txid}")
+    Call<Txi> getTransaction(@Path(value = "path", encoded = true) String path, @Path(value = "txid", encoded = true) String txid);
+
+    /**
+     * The query for the transasctions of multiples addresses
+     * @param path     The path of the insight api without the server address
+     * @param addrs the addresses to be query each separated with a ","
+     */
+    @GET("{path}/addrs/{addrs}/txs")
+    Call<AddressTxi> getTransactionByAddress(@Path(value = "path", encoded = true) String path, @Path(value = "addrs", encoded = true) String addrs);
+
+    /**
+     * Broadcast Transaction
+     * @param path The path of the insight api without the server address
+     * @param rawtx the rawtx to send in Hex String
+     */
+    @FormUrlEncoded
+    @POST("{path}/tx/send")
+    Call<Txi> broadcastTransaction(@Path(value = "path", encoded = true) String path, @Field("rawtx") String rawtx);
+
+    /**
+     * Get the estimate rate fee for a coin in the Insight API
+     * @param path The path of the insight api without the server address
+     */
+    @GET("{path}/utils/estimatefee?nbBlocks=2")
+    Call<JsonObject> estimateFee(@Path(value = "path", encoded = true) String path);
+
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/InsightApiServiceGenerator.java

@@ -0,0 +1,130 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.concurrent.TimeUnit;
+
+import okhttp3.Interceptor;
+import okhttp3.OkHttpClient;
+import okhttp3.logging.HttpLoggingInterceptor;
+import retrofit2.Retrofit;
+import retrofit2.converter.gson.GsonConverterFactory;
+
+/**
+ * Generatir fir tge okhttp connection of the Insight API
+ * TODO finish documentation
+ */
+
+class InsightApiServiceGenerator {
+    /**
+     * Tag used for logging
+     */
+    public static String TAG = "InsightApiServiceGenerator";
+    /**
+     * The complete uri to connect to the insight api, this change from coin to coin
+     */
+    private static String sApiBaseUrl;
+    /**
+     * Loggin interceptor
+     */
+    private static HttpLoggingInterceptor sLogging;
+    /**
+     * Http builder
+     */
+    private static OkHttpClient.Builder sClientBuilder;
+    /**
+     * Builder for the retrofit class
+     */
+    private static Retrofit.Builder sBuilder;
+    /**
+     *
+     */
+    private static HashMap<Class<?>, Object> sServices;
+
+    /**
+     *  Constructor, using the url of a insigth api coin
+     * @param apiBaseUrl The complete url to the server of the insight api
+     */
+    InsightApiServiceGenerator(String apiBaseUrl) {
+        sApiBaseUrl= apiBaseUrl;
+        sLogging = new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY);
+        sClientBuilder = new OkHttpClient.Builder().addInterceptor(sLogging);
+        sBuilder = new Retrofit.Builder().baseUrl(sApiBaseUrl).addConverterFactory(GsonConverterFactory.create());
+        sServices = new HashMap<>();
+    }
+
+    /**
+     *
+     * @param klass
+     * @param thing
+     * @param <T>
+     */
+    private static <T> void setService(Class<T> klass, T thing) {
+        sServices.put(klass, thing);
+    }
+
+    /**
+     *
+     * @param serviceClass
+     * @param <T>
+     * @return
+     */
+    public <T> T getService(Class<T> serviceClass) {
+
+        T service = serviceClass.cast(sServices.get(serviceClass));
+        if (service == null) {
+            service = createService(serviceClass);
+            setService(serviceClass, service);
+        }
+        return service;
+    }
+
+    /**
+     *
+     * @param serviceClass
+     * @param <S>
+     * @return
+     */
+    private static <S> S createService(Class<S> serviceClass) {
+
+        sClientBuilder.interceptors().add(new Interceptor() {
+            @Override
+            public okhttp3.Response intercept(Chain chain) throws IOException {
+                okhttp3.Request original = chain.request();
+                okhttp3.Request.Builder requestBuilder = original.newBuilder().method(original.method(), original.body());
+
+                okhttp3.Request request = requestBuilder.build();
+                return chain.proceed(request);
+            }
+        });
+        sClientBuilder.readTimeout(5, TimeUnit.MINUTES);
+        sClientBuilder.connectTimeout(5, TimeUnit.MINUTES);
+        OkHttpClient client = sClientBuilder.build();
+        Retrofit retrofit = sBuilder.client(client).build();
+        return retrofit.create(serviceClass);
+
+    }
+
+    /**
+     *
+     * @return
+     */
+    public static InsightApiService Create() {
+        OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
+        httpClient.interceptors().add(new Interceptor() {
+            @Override
+            public okhttp3.Response intercept(Chain chain) throws IOException {
+                okhttp3.Request original = chain.request();
+
+                // Customize the request
+                okhttp3.Request request = original.newBuilder().method(original.method(), original.body()).build();
+
+                return chain.proceed(request);
+            }
+        });
+
+        OkHttpClient client = httpClient.build();
+        Retrofit retrofit = new Retrofit.Builder().baseUrl(sApiBaseUrl).client(client).build();
+        return retrofit.create(InsightApiService.class);
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/models/AddressTxi.java

@@ -0,0 +1,24 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi.models;
+
+/**
+ * Represents the address txi of a insishgt api response
+ */
+public class AddressTxi {
+    /**
+     * The total number of items
+     */
+    public int totalItems;
+    /**
+     * The start index of the current txi
+     */
+    public int from;
+    /**
+     * the last index of the current txi
+     */
+    public int to;
+    /**
+     * The arrays of txi of this response
+     */
+    public Txi[] items;
+    
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/models/ScriptPubKey.java

@@ -0,0 +1,24 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi.models;
+
+/**
+ * The transasction Script public keym is used to validate
+ */
+
+public class ScriptPubKey {
+    /**
+     * The code to validate in hex
+     */
+    public String hex;
+    /**
+     * the code to validate this transaction
+     */
+    public String asm;
+    /**
+     * the acoin address involved
+     */
+    public String[] addresses;
+    /**
+     * The type of the hash
+     */
+    public String type;
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/models/ScriptSig.java

@@ -0,0 +1,16 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi.models;
+
+/**
+ * Reprensents the Script signature of an trnasaction Input
+ */
+
+public class ScriptSig {
+    /**
+     * The hex
+     */
+    public String hex;
+    /**
+     * the asm
+     */
+    public String asm;
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/models/Txi.java

@@ -0,0 +1,69 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi.models;
+
+/**
+ * Represents one transaction input of the insight API
+ */
+
+public class Txi {
+    /**
+     * The id of this transaction
+     */
+    public String txid;
+    /**
+     * the version number of this transaction
+     */
+    public int version;
+    /**
+     * Time to hold this transaction
+     */
+    public long locktime;
+    /**
+     * The array of the transaction inputs
+     */
+    public Vin[] vin;
+    /**
+     * the array of the transactions outputs
+     */
+    public Vout[] vout;
+    /**
+     * this block hash
+     */
+    public String blockhash;
+    /**
+     * The blockheight where this transaction belongs, if 0 this transactions hasn't be included in any block yet
+     */
+    public int blockheight;
+    /**
+     * Number of confirmations
+     */
+    public int confirmations;
+    /**
+     * The time of the first broadcast fo this transaction
+     */
+    public long time;
+    /**
+     * The time which this transaction was included
+     */
+    public long blocktime;
+    /**
+     * Total value to transactions outputs
+     */
+    public double valueOut;
+    /**
+     * The size in bytes
+     */
+    public int size;
+    /**
+     * Total value of transactions inputs
+     */
+    public double valueIn;
+    /**
+     * Fee of this transaction has to be valueIn - valueOut
+     */
+    public double fee;
+    /**
+     * This is only for dash, is the instantsend state
+     */
+    public boolean txlock=false;
+
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/models/Vin.java

@@ -0,0 +1,44 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi.models;
+
+/**
+ * This represents a transaction input
+ */
+
+public class Vin {
+    /**
+     * The original transaction id where this transaction is an output
+     */
+    public String txid;
+    /**
+     *
+     */
+    public int vout;
+    /**
+     * Sequence fo the transaction
+     */
+    public long sequence;
+    /**
+     * Order of the transasction input on the transasction
+     */
+    public int n;
+    /**
+     * The script signature
+     */
+    public ScriptSig scriptSig;
+    /**
+     * The addr of this transaction
+     */
+    public String addr;
+    /**
+     * Value in satoshi
+     */
+    public long valueSat;
+    /**
+     * Calue of this transaction
+     */
+    public double value;
+    /**
+     *
+     */
+    public String doubleSpentTxID;
+}

app/src/main/java/cy/agorise/crystalwallet/apigenerator/insightapi/models/Vout.java

@@ -0,0 +1,32 @@
+package cy.agorise.crystalwallet.apigenerator.insightapi.models;
+
+/**
+ * Represents a Transasction output
+ */
+
+public class Vout {
+    /**
+     * The amount of coin
+     */
+    public double value;
+    /**
+     * the order of this transaciton output on the transaction
+     */
+    public int n;
+    /**
+     * The script public key
+     */
+    public ScriptPubKey scriptPubKey;
+    /**
+     * If this transaciton output was spent what txid it belongs
+     */
+    public String spentTxId;
+    /**
+     * The index on the transaction that this transaction was spent
+     */
+    public String spentIndex;
+    /**
+     * The block height of the transaction this output was spent
+     */
+    public String spentHeight;
+}

app/src/main/java/cy/agorise/crystalwallet/application/CrystalApplication.java

@@ -93,7 +93,7 @@ public class CrystalApplication extends Application {
         CryptoNetEvents.getInstance().addListener(crystalWalletNotifier);
 
         //Next line is for use the bitshares main net
-        //CryptoNetManager.addCryptoNetURL(CryptoNet.BITSHARES,BITSHARES_URL);
+        CryptoNetManager.addCryptoNetURL(CryptoNet.BITSHARES,BITSHARES_URL);
 
         GeneralSetting generalSettingPreferredLanguage = db.generalSettingDao().getSettingByName(GeneralSetting.SETTING_NAME_PREFERRED_LANGUAGE);
 

app/src/main/java/cy/agorise/crystalwallet/application/CrystalSecurityMonitor.java

@@ -15,6 +15,7 @@ import java.util.List;
 
 import cy.agorise.crystalwallet.activities.PatternRequestActivity;
 import cy.agorise.crystalwallet.activities.PinRequestActivity;
+import cy.agorise.crystalwallet.activities.PocketRequestActivity;
 import cy.agorise.crystalwallet.models.GeneralSetting;
 import cy.agorise.crystalwallet.notifiers.CrystalWalletNotifier;
 import cy.agorise.crystalwallet.viewmodels.GeneralSettingListViewModel;
@@ -27,6 +28,7 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
     private int numStarted = 0;
     private String passwordEncrypted;
     private String patternEncrypted;
+    private String yubikeyOathTotpPasswordEncrypted;
 
     private static CrystalSecurityMonitor instance;
     private GeneralSettingListViewModel generalSettingListViewModel;
@@ -38,8 +40,10 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
 
         this.passwordEncrypted = "";
         this.patternEncrypted = "";
+        this.yubikeyOathTotpPasswordEncrypted = "";
         GeneralSetting passwordGeneralSetting = generalSettingListViewModel.getGeneralSettingByName(GeneralSetting.SETTING_PASSWORD);;
         GeneralSetting patternGeneralSetting = generalSettingListViewModel.getGeneralSettingByName(GeneralSetting.SETTING_PATTERN);;
+        GeneralSetting yubikeyOathTotpPasswordSetting = generalSettingListViewModel.getGeneralSettingByName(GeneralSetting.SETTING_YUBIKEY_OATH_TOTP_PASSWORD);;
 
         if (passwordGeneralSetting != null){
             this.passwordEncrypted = passwordGeneralSetting.getValue();
@@ -47,6 +51,9 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
         if (patternGeneralSetting != null){
             this.patternEncrypted = patternGeneralSetting.getValue();
         }
+        if (yubikeyOathTotpPasswordSetting != null){
+            this.yubikeyOathTotpPasswordEncrypted = yubikeyOathTotpPasswordSetting.getValue();
+        }
     }
 
     public static CrystalSecurityMonitor getInstance(final FragmentActivity fragmentActivity){
@@ -57,6 +64,10 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
         return instance;
     }
 
+    public static String getServiceName(){
+        return "cy.agorise.crystalwallet";
+    }
+
     public void clearSecurity(){
         this.patternEncrypted = "";
         this.passwordEncrypted = "";
@@ -65,6 +76,12 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
         generalSettingListViewModel.deleteGeneralSettingByName(GeneralSetting.SETTING_PATTERN);
     }
 
+    public void clearSecurity2ndFactor(){
+        this.yubikeyOathTotpPasswordEncrypted = "";
+
+        generalSettingListViewModel.deleteGeneralSettingByName(GeneralSetting.SETTING_YUBIKEY_OATH_TOTP_PASSWORD);
+    }
+
     public void setPasswordSecurity(String password){
         clearSecurity();
         this.passwordEncrypted = password;
@@ -95,6 +112,19 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
         return "";
     }
 
+    public boolean is2ndFactorSet(){
+        return !this.yubikeyOathTotpPasswordEncrypted.equals("");
+    }
+
+    public void setYubikeyOathTotpSecurity(String name, String password){
+        this.yubikeyOathTotpPasswordEncrypted = password;
+        GeneralSetting yubikeyOathTotpSetting = new GeneralSetting();
+        yubikeyOathTotpSetting.setName(GeneralSetting.SETTING_YUBIKEY_OATH_TOTP_PASSWORD);
+        yubikeyOathTotpSetting.setValue(password);
+
+        generalSettingListViewModel.saveGeneralSetting(yubikeyOathTotpSetting);
+    }
+
     @Override
     public void onActivityStarted(Activity activity) {
         if (numStarted == 0) {
@@ -130,6 +160,19 @@ public class CrystalSecurityMonitor implements Application.ActivityLifecycleCall
         }
     }
 
+    public void call2ndFactor(Activity activity){
+        Intent intent = null;
+        if ((this.yubikeyOathTotpPasswordEncrypted != null) && (!this.yubikeyOathTotpPasswordEncrypted.equals(""))) {
+            intent = new Intent(activity, PocketRequestActivity.class);
+            //intent.putExtra("ACTIVITY_TYPE", "PASSWORD_REQUEST");
+            activity.startActivity(intent);
+        }
+    }
+
+    public String get2ndFactorValue(){
+        return this.yubikeyOathTotpPasswordEncrypted;
+    }
+
     @Override
     public void onActivityCreated(Activity activity, Bundle bundle) {
         //

app/src/main/java/cy/agorise/crystalwallet/application/constant/BitsharesConstant.java

@@ -30,7 +30,9 @@ public abstract class BitsharesConstant {
                     "http://185.208.208.147:11012",      // Openledger node
             };
 
-    public final static String FAUCET_URL = "http://185.208.208.147:5010";
+    //testnet faucet
+    //public final static String FAUCET_URL = "http://185.208.208.147:5010";
+    public final static String FAUCET_URL = "https://de.palmpay.io";
     public final static String EQUIVALENT_URL = "wss://bitshares.openledger.info/ws";
 
     public final static BitsharesAsset[] SMARTCOINS = new BitsharesAsset[]{

app/src/main/java/cy/agorise/crystalwallet/fragments/SecuritySettingsFragment.java

@@ -1,20 +1,42 @@
 package cy.agorise.crystalwallet.fragments;
 
+import android.app.PendingIntent;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.nfc.NfcAdapter;
+import android.nfc.Tag;
+import android.nfc.tech.IsoDep;
+import android.nfc.tech.MifareClassic;
+import android.nfc.tech.NdefFormatable;
+import android.nfc.tech.NfcA;
 import android.os.Bundle;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentPagerAdapter;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.CompoundButton;
+import android.widget.EditText;
+import android.widget.Switch;
+import android.widget.Toast;
+
+import org.apache.commons.codec.binary.Base32;
+
+import java.io.IOException;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import butterknife.OnCheckedChanged;
 import cy.agorise.crystalwallet.R;
 import cy.agorise.crystalwallet.application.CrystalSecurityMonitor;
 import cy.agorise.crystalwallet.models.GeneralSetting;
 import cy.agorise.crystalwallet.util.ChildViewPager;
+import cy.agorise.crystalwallet.util.yubikey.Algorithm;
+import cy.agorise.crystalwallet.util.yubikey.OathType;
+import cy.agorise.crystalwallet.util.yubikey.YkOathApi;
 
 /**
  * Created by xd on 1/17/18.
@@ -34,11 +56,23 @@ public class SecuritySettingsFragment extends Fragment {
         return fragment;
     }
 
+    private NfcAdapter mNfcAdapter;
+    private PendingIntent pendingIntent;
+    private IntentFilter ndef;
+    IntentFilter[] intentFiltersArray;
+    String[][] techList;
+
+
     @BindView(R.id.pager)
     public ChildViewPager mPager;
 
     public SecurityPagerAdapter securityPagerAdapter;
 
+    @BindView(R.id.sPocketSecurity)
+    Switch sPocketSecurity;
+    @BindView(R.id.etPocketPassword)
+    EditText etPocketPassword;
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
@@ -66,6 +100,9 @@ public class SecuritySettingsFragment extends Fragment {
         mPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
         tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mPager));
 
+        mNfcAdapter = NfcAdapter.getDefaultAdapter(this.getActivity());
+        this.configureForegroundDispatch();
+
         return v;
     }
 
@@ -101,4 +138,87 @@ public class SecuritySettingsFragment extends Fragment {
             return 3;
         }
     }
+
+    @OnCheckedChanged(R.id.sPocketSecurity)
+    public void onPocketSecurityActivated(CompoundButton button, boolean checked){
+        if (checked) {
+            enableNfc();
+        } else {
+            disableNfc();
+        }
+    }
+
+    public void configureForegroundDispatch(){
+        if (mNfcAdapter != null) {
+            pendingIntent = PendingIntent.getActivity(
+                    this.getActivity(), 0, new Intent(this.getActivity(), getActivity().getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
+
+            ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
+            try {
+                ndef.addDataType("*/*");    /* Handles all MIME based dispatches.
+                                       You should specify only the ones that you need. */
+            } catch (IntentFilter.MalformedMimeTypeException e) {
+                throw new RuntimeException("fail", e);
+            }
+            intentFiltersArray = new IntentFilter[]{ndef,};
+            techList = new String[][]{ new String[] {IsoDep.class.getName(), NfcA.class.getName(), MifareClassic.class.getName(), NdefFormatable.class.getName()} };
+
+        } else {
+            Toast.makeText(this.getContext(), "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
+        }
+    }
+
+    public void enableNfc(){
+        mNfcAdapter.enableForegroundDispatch(this.getActivity(), pendingIntent, intentFiltersArray, techList);
+        Toast.makeText(this.getContext(), "Tap with your yubikey", Toast.LENGTH_LONG).show();
+    }
+
+    public void disableNfc(){
+        mNfcAdapter.disableForegroundDispatch(this.getActivity());
+    }
+
+    public void onPause() {
+        super.onPause();
+        disableNfc();
+    }
+
+    public void onResume() {
+        super.onResume();
+        if (mNfcAdapter != null) {
+            enableNfc();
+        }
+    }
+
+    public void onNewIntent(Intent intent) {
+        Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+        IsoDep tagIsoDep = IsoDep.get(tagFromIntent);
+        Log.i("Tag from nfc","New Intent");
+        try {
+
+            String serviceName = "cy.agorise.crystalwallet";
+            String encodedSecret = etPocketPassword.getText().toString();
+            Base32 decoder = new Base32();
+
+            if ((encodedSecret != null) && (!encodedSecret.equals("")) && decoder.isInAlphabet(encodedSecret)) {
+                byte[] secret = decoder.decode(encodedSecret);
+                tagIsoDep.connect();
+                tagIsoDep.setTimeout(15000);
+                YkOathApi ykOathApi = new YkOathApi(tagIsoDep);
+
+                try {
+                    ykOathApi.putCode(serviceName, secret, OathType.TOTP, Algorithm.SHA256, (byte) 6, 0, false);
+                    CrystalSecurityMonitor.getInstance(null).setYubikeyOathTotpSecurity(CrystalSecurityMonitor.getServiceName(),encodedSecret);
+                } catch(IOException e) {
+                    Toast.makeText(this.getContext(), "There's no space for new credentials!", Toast.LENGTH_LONG).show();
+                }
+
+                tagIsoDep.close();
+                Toast.makeText(this.getContext(), "Credential saved!", Toast.LENGTH_LONG).show();
+            } else {
+                Toast.makeText(this.getContext(), "Invalid password for credential", Toast.LENGTH_LONG).show();
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
 }

app/src/main/java/cy/agorise/crystalwallet/models/GTxIO.java

@@ -0,0 +1,166 @@
+package cy.agorise.crystalwallet.models;
+
+import cy.agorise.crystalwallet.enums.CryptoCoin;
+
+/**
+ * General Coin Transaction Input/Output
+ *
+ * This class represent each Input or Output Transaction of a General Coin Transaction
+ *
+ * Created by henry on 06/02/2017.
+ */
+
+public class GTxIO {
+    /**
+     * The id on the database
+     */
+    private long mId = -1;
+    /**
+     * The Coin type of this transaction
+     */
+    private CryptoCoin mType;
+    /**
+     * The index on the transaction Input/Output
+     */
+    private int mIndex;
+    /**
+     * The address that this transaction Input/Output belongs
+     */
+    private GeneralCoinAddress mAddress;
+    /**
+     * The transaction that this Input/Output belongs
+     */
+    private GeneralTransaction mTransaction;
+    /**
+     * The amount
+     */
+    private long mAmount;
+    /**
+     * If this transaction is output or input
+     */
+    private boolean mIsOut;
+    /**
+     * The address of this transaction as String
+     */
+    private String mAddressString;
+    /**
+     * The Script as Hex
+     */
+    private String mScriptHex;
+    /**
+     * If this is a transaction output, the original transaction where this is input
+     */
+    private String mOriginalTxId;
+
+    /**
+     * Empty Constructor
+     */
+    public GTxIO() {
+
+    }
+
+    /**
+     * General Constructor, used by the DB.
+     *
+     * @param id The id in the dataabase
+     * @param type The coin mType
+     * @param address The addres fo an account on the wallet, or null if the address is external
+     * @param transaction The transaction where this belongs
+     * @param amount The amount with the lowest precision
+     * @param isOut if this is an output
+     * @param addressString The string of the General Coin address, this can't be null
+     * @param index The index on the transaction
+     * @param scriptHex The script in hex String
+     */
+    public GTxIO(long id, CryptoCoin type, GeneralCoinAddress address, GeneralTransaction transaction, long amount, boolean isOut, String addressString, int index, String scriptHex) {
+        this.mId = id;
+        this.mType = type;
+        this.mAddress = address;
+        this.mTransaction = transaction;
+        this.mAmount = amount;
+        this.mIsOut = isOut;
+        this.mAddressString = addressString;
+        this.mIndex = index;
+        this.mScriptHex = scriptHex;
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public void setId(long id) {
+        this.mId = id;
+    }
+
+    public CryptoCoin getType() {
+        return mType;
+    }
+
+    public void setType(CryptoCoin type) {
+        this.mType = type;
+    }
+
+    public int getIndex() {
+        return mIndex;
+    }
+
+    public void setIndex(int index) {
+        this.mIndex = index;
+    }
+
+    public GeneralCoinAddress getAddress() {
+        return mAddress;
+    }
+
+    public void setAddress(GeneralCoinAddress address) {
+        this.mAddress = address;
+    }
+
+    public GeneralTransaction getTransaction() {
+        return mTransaction;
+    }
+
+    public void setTransaction(GeneralTransaction transaction) {
+        this.mTransaction = transaction;
+    }
+
+    public long getAmount() {
+        return mAmount;
+    }
+
+    public void setAmount(long amount) {
+        this.mAmount = amount;
+    }
+
+    public boolean isOut() {
+        return mIsOut;
+    }
+
+    public void setOut(boolean out) {
+        mIsOut = out;
+    }
+
+    public String getAddressString() {
+        return mAddressString;
+    }
+
+    public void setAddressString(String addressString) {
+        this.mAddressString = addressString;
+    }
+
+    public String getScriptHex() {
+        return mScriptHex;
+    }
+
+    public void setScriptHex(String scriptHex) {
+        this.mScriptHex = scriptHex;
+    }
+
+    public String getOriginalTxid() {
+        return mOriginalTxId;
+    }
+
+    public void setOriginalTxid(String originalTxid) {
+        this.mOriginalTxId = originalTxid;
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/models/GeneralCoinAccount.java

@@ -0,0 +1,392 @@
+package cy.agorise.crystalwallet.models;
+
+import android.content.Context;
+import android.util.Log;
+
+import com.google.gson.JsonObject;
+
+import org.bitcoinj.core.NetworkParameters;
+import org.bitcoinj.crypto.ChildNumber;
+import org.bitcoinj.crypto.DeterministicKey;
+import org.bitcoinj.crypto.HDKeyDerivation;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+
+import cy.agorise.crystalwallet.enums.CryptoCoin;
+import cy.agorise.crystalwallet.enums.CryptoNet;
+
+/**
+ * Created by henry on 2/8/2018.
+ */
+
+public abstract class GeneralCoinAccount extends CryptoNetAccount {
+    /**
+     * The account number of the BIP-44
+     */
+    protected int mAccountNumber;
+    /**
+     * The index of the last used external address
+     */
+    protected int mLastExternalIndex;
+    /**
+     * The indes of the last used change address
+     */
+    protected int mLastChangeIndex;
+    /**
+     * The account key, this is calculated as a cache
+     */
+    protected DeterministicKey mAccountKey;
+    /**
+     * With this key we can calculate the external addresses
+     */
+    protected DeterministicKey mExternalKey;
+    /**
+     * With this key we can calculate the change address
+     */
+    protected DeterministicKey mChangeKey;
+    /**
+     * The keys for externals addresses
+     */
+    protected HashMap<Integer, GeneralCoinAddress> mExternalKeys = new HashMap<Integer,GeneralCoinAddress>();
+    /**
+     * The keys for the change addresses
+     */
+    protected HashMap<Integer, GeneralCoinAddress> mChangeKeys = new HashMap<Integer,GeneralCoinAddress>();
+
+    /**
+     * The list of transaction that involves this account
+     */
+    protected List<GeneralTransaction> mTransactions = new ArrayList<GeneralTransaction>();
+
+    /**
+     * The Limit gap define in the BIP-44
+     */
+    private final static int sAddressGap = 20;
+
+    /**
+     * is the coin number defined by the SLIP-44
+     */
+    private final int mCoinNumber;
+
+    public GeneralCoinAccount(long mId, AccountSeed seed, int mAccountIndex, CryptoNet mCryptoNet, int mAccountNumber, int mLastExternalIndex, int mLastChangeIndex, int mCoinNumber) {
+        super(mId, seed.getId(), mAccountIndex, mCryptoNet);
+        this.mAccountNumber = mAccountNumber;
+        this.mLastExternalIndex = mLastExternalIndex;
+        this.mLastChangeIndex = mLastChangeIndex;
+        this.mCoinNumber = mCoinNumber;
+        calculateAddresses((DeterministicKey) seed.getPrivateKey());
+    }
+
+    /**
+     * Setter for the transactions of this account, this is used from the database
+     */
+    public void setTransactions(List<GeneralTransaction> transactions) {
+        this.mTransactions = transactions;
+    }
+
+    /**
+     * Calculates each basic key, not the addresses keys using the BIP-44
+     */
+    private void calculateAddresses(DeterministicKey masterKey) {
+        DeterministicKey purposeKey = HDKeyDerivation.deriveChildKey(masterKey,
+                new ChildNumber(44, true));
+        DeterministicKey coinKey = HDKeyDerivation.deriveChildKey(purposeKey,
+                new ChildNumber(this.mCoinNumber, true));
+        this.mAccountKey = HDKeyDerivation.deriveChildKey(coinKey,
+                new ChildNumber(this.mAccountNumber, true));
+        this.mExternalKey = HDKeyDerivation.deriveChildKey(this.mAccountKey,
+                new ChildNumber(0, false));
+        this.mChangeKey = HDKeyDerivation.deriveChildKey(this.mAccountKey,
+                new ChildNumber(1, false));
+    }
+
+    /**
+     * Calculate the external address keys until the index + gap
+     */
+    public void calculateGapExternal() {
+        for (int i = 0; i < this.mLastExternalIndex + this.sAddressGap; i++) {
+            if (!this.mExternalKeys.containsKey(i)) {
+                this.mExternalKeys.put(i, new GeneralCoinAddress(this, false, i,
+                        HDKeyDerivation.deriveChildKey(this.mExternalKey,
+                                new ChildNumber(i, false))));
+            }
+        }
+    }
+
+    /**
+     * Calculate the change address keys until the index + gap
+     */
+    public void calculateGapChange() {
+        for (int i = 0; i < this.mLastChangeIndex + this.sAddressGap; i++) {
+            if (!this.mChangeKeys.containsKey(i)) {
+                this.mChangeKeys.put(i, new GeneralCoinAddress(this, true, i,
+                        HDKeyDerivation.deriveChildKey(this.mChangeKey,
+                                new ChildNumber(i, false))));
+            }
+        }
+    }
+
+    //TODO check init address
+    /*public List<GeneralCoinAddress> getAddresses(SCWallDatabase db) {
+        //TODO check for used address
+        this.getNextReceiveAddress();
+        this.getNextChangeAddress();
+        this.calculateGapExternal();
+        this.calculateGapChange();
+
+        List<GeneralCoinAddress> addresses = new ArrayList();
+        addresses.addAll(this.mChangeKeys.values());
+        addresses.addAll(this.mExternalKeys.values());
+        this.saveAddresses(db);
+        return addresses;
+    }*/
+
+    /**
+     * Get the list of all the address, external and change addresses
+     * @return a list with all the addresses of this account
+     */
+    public List<GeneralCoinAddress> getAddresses() {
+        List<GeneralCoinAddress> addresses = new ArrayList();
+        addresses.addAll(this.mChangeKeys.values());
+        addresses.addAll(this.mExternalKeys.values());
+        return addresses;
+    }
+
+    /**
+     * Charges the list of addresse of this account, this is used from the database
+     */
+    public void loadAddresses(List<GeneralCoinAddress> addresses) {
+        for (GeneralCoinAddress address : addresses) {
+            if (address.isIsChange()) {
+                this.mChangeKeys.put(address.getIndex(), address);
+            } else {
+                this.mExternalKeys.put(address.getIndex(), address);
+            }
+        }
+    }
+
+    //TODO save address
+    /*public void saveAddresses(SCWallDatabase db) {
+        for (GeneralCoinAddress externalAddress : this.mExternalKeys.values()) {
+            if (externalAddress.getId() == -1) {
+                long id = db.putGeneralCoinAddress(externalAddress);
+                if(id != -1)
+                    externalAddress.setId(id);
+            } else {
+                db.updateGeneralCoinAddress(externalAddress);
+            }
+        }
+
+        for (GeneralCoinAddress changeAddress : this.mChangeKeys.values()) {
+            if (changeAddress.getId() == -1) {
+                Log.i("SCW","change address id " + changeAddress.getId());
+                long id = db.putGeneralCoinAddress(changeAddress);
+                if(id != -1)
+                    changeAddress.setId(id);
+            } else {
+                db.updateGeneralCoinAddress(changeAddress);
+            }
+        }
+
+        db.updateGeneralCoinAccount(this);
+    }*/
+
+    /**
+     * Getter of the account number
+     */
+    public int getAccountNumber() {
+        return this.mAccountNumber;
+    }
+
+    /**
+     * Getter of the last external address used index
+     */
+    public int getLastExternalIndex() {
+        return this.mLastExternalIndex;
+    }
+
+    /**
+     * Getter of the last change address used index
+     */
+    public int getLastChangeIndex() {
+        return this.mLastChangeIndex;
+    }
+
+    /**
+     * Getter of the next receive address
+     * @return The next unused receive address to be used
+     */
+    public abstract String getNextReceiveAddress();
+
+    /**
+     * Getter of the next change address
+     * @return The next unused change address to be used
+     */
+    public abstract String getNextChangeAddress();
+
+    /**
+     * Transfer coin amount to another address
+     *
+     * @param toAddress The destination address
+     * @param coin the coin
+     * @param amount the amount to send in satoshi
+     * @param memo the memo, this can be empty
+     * @param context the android context
+     */
+    public abstract void send(String toAddress, CryptoCoin coin, long amount, String memo,
+                              Context context);
+
+    /**
+     * Transform this account into json object to be saved in the bin file, or any other file
+     */
+    public JsonObject toJson() {
+        JsonObject answer = new JsonObject();
+        answer.addProperty("type", this.getCryptoNet().name());
+        answer.addProperty("name", this.getName());
+        answer.addProperty("accountNumber", this.mAccountNumber);
+        answer.addProperty("changeIndex", this.mLastChangeIndex);
+        answer.addProperty("externalIndex", this.mLastExternalIndex);
+        return answer;
+    }
+
+    /**
+     * Getter of the list of transactions
+     */
+    public List<GeneralTransaction> getTransactions() {
+        List<GeneralTransaction> transactions = new ArrayList();
+        for (GeneralCoinAddress address : this.mExternalKeys.values()) {
+            for (GTxIO giotx : address.getTransactionInput()) {
+                if (!transactions.contains(giotx.getTransaction())) {
+                    transactions.add(giotx.getTransaction());
+                }
+            }
+            for (GTxIO giotx : address.getTransactionOutput()) {
+                if (!transactions.contains(giotx.getTransaction())) {
+                    transactions.add(giotx.getTransaction());
+                }
+            }
+        }
+
+        for (GeneralCoinAddress address : this.mChangeKeys.values()) {
+            for (GTxIO giotx : address.getTransactionInput()) {
+                if (!transactions.contains(giotx.getTransaction())) {
+                    transactions.add(giotx.getTransaction());
+                }
+            }
+            for (GTxIO giotx : address.getTransactionOutput()) {
+                if (!transactions.contains(giotx.getTransaction())) {
+                    transactions.add(giotx.getTransaction());
+                }
+            }
+            ;
+        }
+
+        Collections.sort(transactions, new TransactionsCustomComparator());
+        return transactions;
+    }
+
+    public CryptoCoin getCryptoCoin(){
+        return CryptoCoin.valueOf(this.getCryptoNet().name());
+    }
+
+    /**
+     * Get the address as string of an adrees index
+     * @param index The index of the address
+     * @param change if it is change addres or is a external address
+     * @return The Address as string
+     */
+    public abstract String getAddressString(int index, boolean change);
+
+    /**
+     * Get the GeneralCoinAddress object of an address
+     * @param index the index of the address
+     * @param change if it is change addres or is a external address
+     * @return The GeneralCoinAddress of the address
+     */
+    public abstract GeneralCoinAddress getAddress(int index, boolean change);
+
+    /**
+     * Return the network parameters, this is used for the bitcoiinj library
+     */
+    public abstract NetworkParameters getNetworkParam();
+
+    /**
+     * Triggers the event onBalanceChange
+     */
+    public void balanceChange() {
+        this._fireOnChangeBalance(this.getBalance().get(0)); //TODO make it more genertic
+    }
+
+    public abstract List<CryptoNetBalance> getBalance();
+
+    /**
+     * Compare the transaction, to order it for the list of transaction
+     */
+    public class TransactionsCustomComparator implements Comparator<GeneralTransaction> {
+        @Override
+        public int compare(GeneralTransaction o1, GeneralTransaction o2) {
+            return o1.getDate().compareTo(o2.getDate());
+        }
+    }
+
+    /**
+     * Add listener for the onChangebalance Event
+     */
+    /*public void addChangeBalanceListener(ChangeBalanceListener listener) {
+        this.mChangeBalanceListeners.add(listener);
+    }*/
+
+    /**
+     * Fire the onChangeBalance event
+     */
+    protected void _fireOnChangeBalance(CryptoNetBalance balance) {
+        /*for (ChangeBalanceListener listener : this.mChangeBalanceListeners) {
+            listener.balanceChange(balance);
+        }*/
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GeneralCoinAccount that = (GeneralCoinAccount) o;
+
+        if (this.getCryptoNet() != that.getCryptoNet()) return false;
+        if (this.getAccountNumber() != that.getAccountNumber()) return false;
+        return this.mAccountKey != null ? this.mAccountKey.equals(that.mAccountKey)
+                : that.mAccountKey == null;
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = this.getAccountNumber();
+        result = 31 * result + (this.mAccountKey != null ? this.mAccountKey.hashCode() : 0);
+        return result;
+    }
+
+    /**
+     * Updates a transaction
+     *
+     * @param transaction The transaction to update
+     */
+    public void updateTransaction(GeneralTransaction transaction){
+        // Checks if it has an external address
+        for (GeneralCoinAddress address : this.mExternalKeys.values()) {
+            if(address.updateTransaction(transaction)){
+                return;
+            }
+        }
+
+        for (GeneralCoinAddress address : this.mChangeKeys.values()) {
+            if(address.updateTransaction(transaction)){
+                return;
+            }
+        }
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/models/GeneralCoinAddress.java

@@ -0,0 +1,371 @@
+package cy.agorise.crystalwallet.models;
+
+import org.bitcoinj.core.Address;
+import org.bitcoinj.core.ECKey;
+import org.bitcoinj.core.NetworkParameters;
+import org.bitcoinj.crypto.DeterministicKey;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+import cy.agorise.graphenej.Util;
+
+/**
+ * Represents an Address of a General Coin Account
+ */
+public class GeneralCoinAddress {
+    /**
+     * The id on the database
+     */
+    private long mId = -1;
+    /**
+     * The account that this address belongs
+     */
+    private final GeneralCoinAccount mAccount;
+    /**
+     * If this is change or external
+     */
+    private final boolean mIsChange;
+    /**
+     * The index fo this address in the account
+     */
+    private final int mIndex;
+    /**
+     * The ky used to calculate the address
+     */
+    private ECKey mKey;
+    /**
+     * The list of the transactions that used this address as input
+     */
+    private List<GTxIO> mTransactionInput = new ArrayList<>();
+    /**
+     * The list of the transactions that used this address as output
+     */
+    private List<GTxIO> mTransactionOutput = new ArrayList<>();
+
+    /**
+     * Contrsutcotr used from the database
+     * @param id The id on the database
+     * @param account The account of this address
+     * @param isChange if it is change or external address
+     * @param index the index on the account of this address
+     * @param publicHexKey The public Address String
+     */
+    public GeneralCoinAddress(long id, GeneralCoinAccount account, boolean isChange, int index, String publicHexKey) {
+        this.mId = id;
+        this.mAccount = account;
+        this.mIsChange = isChange;
+        this.mIndex = index;
+        this.mKey = ECKey.fromPublicOnly(Util.hexToBytes(publicHexKey));
+    }
+
+    /**
+     * Basic constructor
+     * @param account The account of this address
+     * @param isChange if it is change or external address
+     * @param index The index on the account of this address
+     * @param key The key to generate the private and the public key of this address
+     */
+    public GeneralCoinAddress(GeneralCoinAccount account, boolean isChange, int index, DeterministicKey key) {
+        this.mId = -1;
+        this.mAccount = account;
+        this.mIsChange = isChange;
+        this.mIndex = index;
+        this.mKey = key;
+    }
+
+    /**
+     * Getter of the database id
+     */
+    public long getId() {
+        return mId;
+    }
+
+    /**
+     * Setter of the database id
+     */
+    public void setId(long id) {
+        this.mId = id;
+    }
+    /**
+     * Getter for he account
+     */
+    public GeneralCoinAccount getAccount() {
+        return mAccount;
+    }
+
+    /**
+     * Indicates if this addres is change, if not is external
+     */
+    public boolean isIsChange() {
+        return mIsChange;
+    }
+
+    /**
+     * Getter for the index on the account of this address
+     */
+    public int getIndex() {
+        return mIndex;
+    }
+
+    /**
+     * Getter for the key of this address
+     */
+    public ECKey getKey() {
+        return mKey;
+    }
+
+    /**
+     * Set the key for generate private key, this is used when this address is loaded from the database
+     * and want to be used to send transactions
+     * @param key The key that generates the private and the public key
+     */
+    public void setKey(DeterministicKey key) {
+        this.mKey = key;
+    }
+
+    /**
+     * Get the address as a String
+     * @param param The network param of this address
+     */
+    public String getAddressString(NetworkParameters param) {
+        return mKey.toAddress(param).toString();
+    }
+
+    /**
+     * Returns the bitcoinj Address representing this address
+     * @param param The network parameter of this address
+     */
+    public Address getAddress(NetworkParameters param) {
+        return mKey.toAddress(param);
+    }
+
+    /**
+     * Gets the list of transaction that this address is input
+     */
+    public List<GTxIO> getTransactionInput() {
+        return mTransactionInput;
+    }
+
+    /**
+     * Set the transactions that this address is input
+     */
+    public void setTransactionInput(List<GTxIO> transactionInput) {
+        this.mTransactionInput = transactionInput;
+    }
+
+    /**
+     * Find if this address is input of a transaction
+     * @param inputToFind The GTxIO to find
+     * @param param The network parameter of this address
+     * @return if this address belongs to the transaction
+     */
+    public boolean hasTransactionInput(GTxIO inputToFind, NetworkParameters param) {
+        for (GTxIO input : mTransactionInput) {
+            if ((input.getTransaction().getTxid().equals(inputToFind.getTransaction().getTxid()))
+                    && (input.getAddress().getAddressString(param).equals(inputToFind.getAddress()
+                    .getAddressString(param)))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Gets the list of transaction that this address is output
+     */
+    public List<GTxIO> getTransactionOutput() {
+        return mTransactionOutput;
+    }
+
+    /**
+     * Find if this address is output of a transaction
+     * @param outputToFind The GTxIO to find
+     * @param param the network parameter of this address
+     * @return if this address belongs to the transaction
+     */
+    public boolean hasTransactionOutput(GTxIO outputToFind, NetworkParameters param) {
+        for (GTxIO output : mTransactionOutput) {
+            if ((output.getTransaction().getTxid().equals(outputToFind.getTransaction().getTxid()))
+                    && (output.getAddress().getAddressString(param).equals(outputToFind.getAddress()
+                    .getAddressString(param)))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Sets the list of transaction that this address is output
+     */
+    public void setTransactionOutput(List<GTxIO> outputTransaction) {
+        this.mTransactionOutput = outputTransaction;
+    }
+
+    /**
+     * Get the amount of uncofirmed balance
+     */
+    public long getUnconfirmedBalance() {
+        long answer = 0;
+        for (GTxIO input : mTransactionInput) {
+            if (input.getTransaction().getConfirm() < mAccount.getCryptoNet().getConfirmationsNeeded()) {
+                answer += input.getAmount();
+            }
+        }
+
+        for (GTxIO output : mTransactionOutput) {
+            if (output.getTransaction().getConfirm() < mAccount.getCryptoNet().getConfirmationsNeeded()) {
+                answer -= output.getAmount();
+            }
+        }
+
+        return answer;
+    }
+
+    /**
+     * Get the amount of confirmed balance
+     */
+    public long getConfirmedBalance() {
+        long answer = 0;
+        for (GTxIO input : mTransactionInput) {
+            if (input.getTransaction().getConfirm() >= mAccount.getCryptoNet().getConfirmationsNeeded()) {
+                answer += input.getAmount();
+            }
+        }
+
+        for (GTxIO output : mTransactionOutput) {
+            if (output.getTransaction().getConfirm() >= mAccount.getCryptoNet().getConfirmationsNeeded()) {
+                answer -= output.getAmount();
+            }
+        }
+
+        return answer;
+    }
+
+    /**
+     * Get the date of the last transaction or null if there is no transaction
+     */
+    public Date getLastDate() {
+        Date lastDate = null;
+        for (GTxIO input : mTransactionInput) {
+            if (lastDate == null || lastDate.before(input.getTransaction().getDate())) {
+                lastDate = input.getTransaction().getDate();
+            }
+        }
+        for (GTxIO output : mTransactionOutput) {
+            if (lastDate == null || lastDate.before(output.getTransaction().getDate())) {
+                lastDate = output.getTransaction().getDate();
+            }
+        }
+        return lastDate;
+    }
+
+    /**
+     * Get the amount of the less cofnirmed transaction, this is used to set how confirmations are
+     * left
+     */
+    public int getLessConfirmed(){
+        int lessConfirm = -1;
+        for (GTxIO input : mTransactionInput) {
+            if (lessConfirm == -1 || input.getTransaction().getConfirm() < lessConfirm) {
+                lessConfirm = input.getTransaction().getConfirm();
+            }
+        }
+
+        for (GTxIO output : mTransactionOutput) {
+            if (lessConfirm == -1 || output.getTransaction().getConfirm() < lessConfirm) {
+                lessConfirm = output.getTransaction().getConfirm();
+            }
+        }
+        return lessConfirm;
+    }
+
+    /**
+     * Gets the unspend transactions input
+     * @return The list with the unspend transasctions
+     */
+    public List<GTxIO> getUTXos(){
+        List<GTxIO> utxo = new ArrayList<>();
+        for(GTxIO gitx : mTransactionInput){
+            boolean find = false;
+            for(GTxIO gotx : mTransactionOutput){
+                if(gitx.getTransaction().getTxid().equals(gotx.getOriginalTxid())){
+                    find = true;
+                    break;
+                }
+            }
+            if(!find){
+                utxo.add(gitx);
+            }
+        }
+        return utxo;
+    }
+
+    /**
+     * Fire the onBalanceChange event
+     */
+    public void BalanceChange() {
+        this.getAccount().balanceChange();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GeneralCoinAddress that = (GeneralCoinAddress) o;
+
+        return mIsChange == that.mIsChange && mIndex == that.mIndex && mId == -1
+                && (mAccount != null ? mAccount.equals(that.mAccount) : that.mAccount == null
+                && (mKey != null ? mKey.equals(that.mKey) : that.mKey == null
+                && (mTransactionInput != null ? mTransactionInput.equals(that.mTransactionInput)
+                : that.mTransactionInput == null && (mTransactionOutput != null
+                ? mTransactionOutput.equals(that.mTransactionOutput)
+                : that.mTransactionOutput == null))));
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = (int) mId;
+        result = 31 * result + (mAccount != null ? mAccount.hashCode() : 0);
+        result = 31 * result + (mIsChange ? 1 : 0);
+        result = 31 * result + mIndex;
+        result = 31 * result + (mKey != null ? mKey.hashCode() : 0);
+        result = 31 * result + (mTransactionInput != null ? mTransactionInput.hashCode() : 0);
+        result = 31 * result + (mTransactionOutput != null ? mTransactionOutput.hashCode() : 0);
+        return result;
+    }
+
+    /**
+     * Update the transactions of this Address
+     * @param transaction The transaction to update
+     * @return true if this address has the transaction false otherwise
+     */
+    public boolean updateTransaction(GeneralTransaction transaction){
+        for(GTxIO gitx : mTransactionInput){
+            if(gitx.getTransaction().equals(transaction)){
+                gitx.getTransaction().setConfirm(transaction.getConfirm());
+                gitx.getTransaction().setBlock(transaction.getBlock());
+                gitx.getTransaction().setBlockHeight(transaction.getBlockHeight());
+                gitx.getTransaction().setDate(transaction.getDate());
+                gitx.getTransaction().setMemo(transaction.getMemo());
+                return true;
+            }
+        }
+
+        for(GTxIO gotx : mTransactionOutput){
+            if(gotx.getTransaction().equals(transaction)){
+                gotx.getTransaction().setConfirm(transaction.getConfirm());
+                gotx.getTransaction().setBlock(transaction.getBlock());
+                gotx.getTransaction().setBlockHeight(transaction.getBlockHeight());
+                gotx.getTransaction().setDate(transaction.getDate());
+                gotx.getTransaction().setMemo(transaction.getMemo());
+                return true;
+            }
+        }
+        return false;
+    }
+}
+

app/src/main/java/cy/agorise/crystalwallet/models/GeneralSetting.java

@@ -23,6 +23,8 @@ public class GeneralSetting {
     public final static String SETTING_PATTERN = "PATTERN";
     public final static String SETTING_NAME_RECEIVED_FUNDS_SOUND_PATH = "RECEIVED_FUNDS_SOUND_PATH";
     public final static String SETTING_LAST_LICENSE_READ = "LAST_LICENSE_READ";
+    public final static String SETTING_YUBIKEY_OATH_TOTP_NAME = "YUBIKEY_OATH_TOTP_NAME";
+    public final static String SETTING_YUBIKEY_OATH_TOTP_PASSWORD = "YUBIKEY_OATH_TOTP_PASSWORD";
 
     /**
      * The id on the database

app/src/main/java/cy/agorise/crystalwallet/models/GeneralTransaction.java

@@ -0,0 +1,236 @@
+package cy.agorise.crystalwallet.models;
+
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+
+import cy.agorise.crystalwallet.enums.CryptoCoin;
+
+/**
+ * A General Coin Transaction, of Cryptocurrency like bitcoin
+ *
+ * Created by henry on 06/02/2017.
+ */
+
+public class GeneralTransaction {
+    /**
+     * The id on the database
+     */
+    private long mId = -1;
+    /**
+     * The Tx id of this transaciton
+     */
+    private String mTxId;
+    /**
+     * the type of crypto coin fo this transaction
+     */
+    private CryptoCoin mType;
+    /**
+     * If this is confirmed, the block where it belongs, 0 means this hasn't be included in any block
+     */
+    private long mBlock;
+    /**
+     * The amount of fee of this transaction
+     */
+    private long mFee;
+    /**
+     * the number of confirmations of this transacion, 0 means it hasn't been included in any block
+     */
+    private int mConfirm;
+    /**
+     * The date of this transaction first broadcast
+     */
+    private Date mDate;
+    /**
+     * The height of this transaction on the block
+     */
+    private int mBlockHeight;
+    /**
+     * The memo of this transaciton
+     */
+    private String mMemo = null;
+    /**
+     * The account that this transaction belong as input or output.
+     */
+    private GeneralCoinAccount mAccount;
+    /**
+     * The inputs of this transactions
+     */
+    private List<GTxIO> mTxInputs = new ArrayList();
+    /**
+     * the outputs of this transasctions
+     */
+    private List<GTxIO> mTxOutputs = new ArrayList();
+
+    /**
+     * empty constructor
+     */
+    public GeneralTransaction() {
+    }
+
+    /**
+     * Constructor form the database
+     * @param id the id on the database
+     * @param txid the txid of this transaction
+     * @param type The cryptocoin type
+     * @param block The block where this transaction is, 0 means this hasn't be confirmed
+     * @param fee the fee of this transaction
+     * @param confirm the number of confirmations of this transasciton
+     * @param date the date of this transaction
+     * @param blockHeight the height on the block where this transasciton is
+     * @param memo the memo of this transaction
+     * @param account The account to this transaction belongs, as input or output
+     */
+    public GeneralTransaction(long id, String txid, CryptoCoin type, long block, long fee, int confirm, Date date, int blockHeight, String memo, GeneralCoinAccount account) {
+        this.mId = id;
+        this.mTxId = txid;
+        this.mType = type;
+        this.mBlock = block;
+        this.mFee = fee;
+        this.mConfirm = confirm;
+        this.mDate = date;
+        this.mBlockHeight = blockHeight;
+        this.mMemo = memo;
+        this.mAccount = account;
+    }
+
+    public long getId() {
+        return mId;
+    }
+
+    public void setId(long id) {
+        this.mId = id;
+    }
+
+    public String getTxid() {        return mTxId;    }
+
+    public void setTxid(String txid) {        this.mTxId = txid;    }
+
+    public CryptoCoin getType() {
+        return mType;
+    }
+
+    public void setType(CryptoCoin type) {
+        this.mType = type;
+    }
+
+    public long getBlock() {
+        return mBlock;
+    }
+
+    public void setBlock(long block) {
+        this.mBlock = block;
+    }
+
+    public long getFee() {
+        return mFee;
+    }
+
+    public void setFee(long fee) {
+        this.mFee = fee;
+    }
+
+    public int getConfirm() {
+        return mConfirm;
+    }
+
+    public void setConfirm(int confirm) {
+        this.mConfirm = confirm;
+    }
+
+    public Date getDate() {
+        return mDate;
+    }
+
+    public void setDate(Date date) {
+        this.mDate = date;
+    }
+
+    public int getBlockHeight() {
+        return mBlockHeight;
+    }
+
+    public void setBlockHeight(int blockHeight) {
+        this.mBlockHeight = blockHeight;
+    }
+
+    public String getMemo() {
+        return mMemo;
+    }
+
+    public void setMemo(String memo) {
+        this.mMemo = memo;
+    }
+
+    public List<GTxIO> getTxInputs() {
+        return mTxInputs;
+    }
+
+    public void setTxInputs(List<GTxIO> txInputs) {
+        this.mTxInputs = txInputs;
+    }
+
+    public List<GTxIO> getTxOutputs() {
+        return mTxOutputs;
+    }
+
+    public void setTxOutputs(List<GTxIO> txOutputs) {
+        this.mTxOutputs = txOutputs;
+    }
+
+    public GeneralCoinAccount getAccount() {
+        return mAccount;
+    }
+
+    public void setAccount(GeneralCoinAccount account) {
+        this.mAccount = account;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        GeneralTransaction that = (GeneralTransaction) o;
+
+        if (mTxId != null ? !mTxId.equals(that.mTxId) : that.mTxId != null) return false;
+        return mType == that.mType;
+
+    }
+
+    @Override
+    public int hashCode() {
+        int result = mTxId != null ? mTxId.hashCode() : 0;
+        result = 31 * result + mType.hashCode();
+        return result;
+    }
+
+
+    /**
+     * Returns how this transaction changes the balance of the account
+     * @return The amount of balance this transasciton adds to the total balance of the account
+     */
+    public double getAccountBalanceChange(){
+        double balance = 0;
+        boolean theresAccountInput = false;
+
+        for (GTxIO txInputs : this.getTxInputs()){
+            if (txInputs.isOut() && (txInputs.getAddress() != null)){
+                balance += -txInputs.getAmount();
+                theresAccountInput = true;
+            }
+        }
+
+        for (GTxIO txOutput : this.getTxOutputs()){
+            if (!txOutput.isOut() && (txOutput.getAddress() != null)){
+                balance += txOutput.getAmount();
+            }
+        }
+
+        if (theresAccountInput){
+            balance += -this.getFee();
+        }
+
+        return balance;
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/util/PasswordManager.java

@@ -1,5 +1,11 @@
 package cy.agorise.crystalwallet.util;
 
+import android.util.Log;
+
+import java.math.BigInteger;
+
+import cy.agorise.crystalwallet.util.yubikey.TOTP;
+
 /**
  * Created by Henry Varona on 29/1/2018.
  */
@@ -19,4 +25,35 @@ public class PasswordManager {
     public static String encriptPassword(String password){
         return password;
     }
+
+    public static String totpd(String sharedSecret, long unixtime, byte[] salt){
+        char[] ch = sharedSecret.toCharArray();
+
+        StringBuilder builder = new StringBuilder();
+        for (char c : ch) {
+            String hexCode=String.format("%H", c);
+            builder.append(hexCode);
+        }
+        String secretHex = String.format("%040x", new BigInteger(1, sharedSecret.getBytes()));
+
+        long time = unixtime/30L;
+
+        String steps = Long.toHexString(time).toUpperCase();
+
+
+
+        /*for (int i=0;i<64;i++){
+            steps = Long.toHexString(time+i).toUpperCase();
+            Log.i("TOTPTEST", TOTP.generateTOTP(
+                    secretHex,
+                    steps,
+                    "6", "HmacSHA1", salt));
+            secretHex = "00"+secretHex;
+        }*/
+
+        return TOTP.generateTOTP(
+                secretHex,
+                steps,
+                "6", "HmacSHA1", salt);
+    }
 }

app/src/main/java/cy/agorise/crystalwallet/util/yubikey/Algorithm.java

@@ -0,0 +1,58 @@
+package cy.agorise.crystalwallet.util.yubikey;
+
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Arrays;
+
+import kotlin.jvm.internal.Intrinsics;
+
+public enum Algorithm {
+    SHA1((byte)1, "SHA1", 64),
+    SHA256((byte)2, "SHA256", 64),
+    SHA512((byte)3, "SHA512", 128);
+
+    protected Byte byteVal;
+    protected String name;
+    protected int blockSize;
+    protected MessageDigest messageDigest;
+
+    Algorithm(Byte byteVal, String name, int blockSize){
+        this.byteVal = byteVal;
+        this.name = name;
+        this.blockSize = blockSize;
+
+        try {
+            this.messageDigest = MessageDigest.getInstance(name);
+        } catch (NoSuchAlgorithmException e){
+            this.messageDigest = null;
+        }
+    }
+
+    public Byte getByteVal(){
+        return this.byteVal;
+    }
+
+    public String getName(){
+        return this.name;
+    }
+
+    public int getBlockSize() {
+        return this.blockSize;
+    }
+
+    public byte[] prepareKey(byte[] key){
+        int keyLength = key.length;
+        byte[] keyPrepared;
+        if ((0 <= keyLength) && (keyLength <= 13)) {
+            keyPrepared = Arrays.copyOf(key, 14);
+            return keyPrepared;
+        }
+        if ((14 <= keyLength) && (keyLength <= this.blockSize)){
+            keyPrepared = key;
+            return keyPrepared;
+        }
+
+        keyPrepared = this.messageDigest.digest(key);
+        return keyPrepared;
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/util/yubikey/OathType.java

@@ -0,0 +1,16 @@
+package cy.agorise.crystalwallet.util.yubikey;
+
+public enum OathType {
+    HOTP((byte)0x10),
+    TOTP((byte)0x20);
+
+    protected Byte byteVal;
+
+    OathType(Byte byteVal){
+        this.byteVal = byteVal;
+    }
+
+    public Byte getByteVal(){
+        return this.byteVal;
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/util/yubikey/TOTP.java

@@ -0,0 +1,185 @@
+package cy.agorise.crystalwallet.util.yubikey;
+
+import java.lang.reflect.UndeclaredThrowableException;
+import java.security.GeneralSecurityException;
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import javax.crypto.Mac;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.SecretKeySpec;
+import java.math.BigInteger;
+import java.util.TimeZone;
+
+/*
+* Source of this class: https://tools.ietf.org/html/rfc6238
+* */
+
+public class TOTP {
+
+    private TOTP() {}
+
+    /**
+     * This method uses the JCE to provide the crypto algorithm.
+     * HMAC computes a Hashed Message Authentication Code with the
+     * crypto hash algorithm as a parameter.
+     *
+     * @param crypto: the crypto algorithm (HmacSHA1, HmacSHA256,
+     *                             HmacSHA512)
+     * @param keyBytes: the bytes to use for the HMAC key
+     * @param text: the message or text to be authenticated
+     */
+
+    private static byte[] hmac_sha(String crypto, byte[] keyBytes,
+                                   byte[] text, byte[] salt){
+        try {
+            Mac hmac;
+            hmac = Mac.getInstance(crypto);
+            SecretKeySpec macKey =
+                    new SecretKeySpec(keyBytes, "RAW");
+            hmac.init(macKey);
+            return hmac.doFinal(text);
+            /*PBEKeySpec spec = new PBEKeySpec((new String(text)).toCharArray(), salt, 1000, 128);
+            SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
+            byte[] hash = skf.generateSecret(spec).getEncoded();
+            return hash;*/
+        } catch (GeneralSecurityException gse) {
+            throw new UndeclaredThrowableException(gse);
+        }
+    }
+
+
+    /**
+     * This method converts a HEX string to Byte[]
+     *
+     * @param hex: the HEX string
+     *
+     * @return: a byte array
+     */
+
+    private static byte[] hexStr2Bytes(String hex){
+        // Adding one byte to get the right conversion
+        // Values starting with "0" can be converted
+        byte[] bArray = new BigInteger("10" + hex,16).toByteArray();
+
+        // Copy all the REAL bytes, not the "first"
+        byte[] ret = new byte[bArray.length - 1];
+        for (int i = 0; i < ret.length; i++)
+            ret[i] = bArray[i+1];
+        return ret;
+    }
+
+    private static final int[] DIGITS_POWER
+            // 0 1  2   3    4     5      6       7        8
+            = {1,10,100,1000,10000,100000,1000000,10000000,100000000 };
+
+    /**
+     * This method generates a TOTP value for the given
+     * set of parameters.
+     *
+     * @param key: the shared secret, HEX encoded
+     * @param time: a value that reflects a time
+     * @param returnDigits: number of digits to return
+     *
+     * @return: a numeric String in base 10 that includes
+     *              {@link truncationDigits} digits
+     */
+
+    public static String generateTOTP(String key,
+                                      String time,
+                                      String returnDigits,
+                                      byte[] salt){
+        return generateTOTP(key, time, returnDigits, "PBKDF2WithHmacSHA1", salt);
+    }
+
+
+    /**
+     * This method generates a TOTP value for the given
+     * set of parameters.
+     *
+     * @param key: the shared secret, HEX encoded
+     * @param time: a value that reflects a time
+     * @param returnDigits: number of digits to return
+     *
+     * @return: a numeric String in base 10 that includes
+     *              {@link truncationDigits} digits
+     */
+
+    public static String generateTOTP256(String key,
+                                         String time,
+                                         String returnDigits,
+                                         byte[] salt){
+        return generateTOTP(key, time, returnDigits, "HmacSHA256", salt);
+    }
+
+    /**
+     * This method generates a TOTP value for the given
+     * set of parameters.
+     *
+     * @param key: the shared secret, HEX encoded
+     * @param time: a value that reflects a time
+     * @param returnDigits: number of digits to return
+     *
+     * @return: a numeric String in base 10 that includes
+     *              {@link truncationDigits} digits
+     */
+
+    public static String generateTOTP512(String key,
+                                         String time,
+                                         String returnDigits,
+                                         byte[] salt){
+        return generateTOTP(key, time, returnDigits, "HmacSHA512", salt);
+    }
+
+
+    /**
+     * This method generates a TOTP value for the given
+     * set of parameters.
+     *
+     * @param key: the shared secret, HEX encoded
+     * @param time: a value that reflects a time
+     * @param returnDigits: number of digits to return
+     * @param crypto: the crypto function to use
+     *
+     * @return: a numeric String in base 10 that includes
+     *              {@link truncationDigits} digits
+     */
+
+    public static String generateTOTP(String key,
+                                      String time,
+                                      String returnDigits,
+                                      String crypto,
+                                      byte[] salt){
+        int codeDigits = Integer.decode(returnDigits).intValue();
+        String result = null;
+
+        // Using the counter
+        // First 8 bytes are for the movingFactor
+        // Compliant with base RFC 4226 (HOTP)
+        while (time.length() < 16 )
+            time = "0" + time;
+
+        // Get the HEX in a Byte[]
+        byte[] msg = hexStr2Bytes(time);
+        byte[] k = hexStr2Bytes(key);
+        byte[] hash = hmac_sha(crypto, k, msg, salt);
+
+        // put selected bytes into result int
+        int offset = hash[hash.length - 1] & 0xf;
+
+        int binary =
+                ((hash[offset] & 0x7f) << 24) |
+                        ((hash[offset + 1] & 0xff) << 16) |
+                        ((hash[offset + 2] & 0xff) << 8) |
+                        (hash[offset + 3] & 0xff);
+
+        int otp = binary % DIGITS_POWER[codeDigits];
+
+        result = Integer.toString(otp);
+        while (result.length() < codeDigits) {
+            result = "0" + result;
+        }
+        return result;
+    }
+}

app/src/main/java/cy/agorise/crystalwallet/util/yubikey/YkOathApi.kt

@@ -0,0 +1,268 @@
+package cy.agorise.crystalwallet.util.yubikey
+
+import android.nfc.tech.IsoDep
+import android.util.Base64
+//import com.yubico.yubioath.exc.AppletMissingException
+//import com.yubico.yubioath.exc.AppletSelectException
+//import com.yubico.yubioath.exc.StorageFullException
+//import com.yubico.yubioath.transport.ApduError
+//import com.yubico.yubioath.transport.Backend
+import java.io.Closeable
+import java.io.IOException
+import java.nio.ByteBuffer
+import java.security.MessageDigest
+
+
+class YkOathApi @Throws(IOException::class/*, AppletSelectException::class*/)
+constructor(private var tag: IsoDep) : Closeable {
+    val deviceSalt: ByteArray
+    val deviceInfo: DeviceInfo
+    private var challenge = byteArrayOf()
+
+    init {
+        //try {
+            val resp = send(0xa4.toByte(), p1 = 0x04) { put(AID) }
+            val version = Version.parse(resp.parseTlv(VERSION_TAG))
+            deviceSalt = resp.parseTlv(NAME_TAG)
+            val id = getDeviceId(deviceSalt)
+
+            if (resp.hasRemaining()) {
+                challenge = resp.parseTlv(CHALLENGE_TAG)
+            }
+
+            deviceInfo = DeviceInfo(id, false, version, challenge.isNotEmpty())
+        /*} catch (e: ApduError) {
+            throw AppletMissingException()
+        }*/
+    }
+
+   /* fun isLocked(): Boolean = challenge.isNotEmpty()
+
+    fun reselect() {
+        send(0xa4.toByte(), p1 = 0x04) { put(AID) }.apply {
+            parseTlv(VERSION_TAG)
+            parseTlv(NAME_TAG)
+            challenge = if (hasRemaining()) {
+                parseTlv(CHALLENGE_TAG)
+            } else byteArrayOf()
+        }
+    }
+
+    fun unlock(signer: ChallengeSigner): Boolean {
+        val response = signer.sign(challenge)
+        val myChallenge = ByteArray(8)
+        val random = SecureRandom()
+        random.nextBytes(myChallenge)
+        val myResponse = signer.sign(myChallenge)
+
+        return try {
+            val resp = send(VALIDATE_INS) {
+                tlv(RESPONSE_TAG, response)
+                tlv(CHALLENGE_TAG, myChallenge)
+            }
+            Arrays.equals(myResponse, resp.parseTlv(RESPONSE_TAG))
+        } catch (e: ApduError) {
+            false
+        }
+    }
+
+    fun setLockCode(secret: ByteArray) {
+        val challenge = ByteArray(8)
+        val random = SecureRandom()
+        random.nextBytes(challenge)
+        val response = Mac.getInstance("HmacSHA1").apply {
+            init(SecretKeySpec(secret, algorithm))
+        }.doFinal(challenge)
+
+        send(SET_CODE_INS) {
+            tlv(KEY_TAG, byteArrayOf(OathType.TOTP.byteVal or Algorithm.SHA1.byteVal) + secret)
+            tlv(CHALLENGE_TAG, challenge)
+            tlv(RESPONSE_TAG, response)
+        }
+        deviceInfo.hasPassword = true
+    }
+
+    fun unsetLockCode() {
+        send(SET_CODE_INS) { tlv(KEY_TAG) }
+        deviceInfo.hasPassword = false
+    }*/
+
+    fun listCredentials(): List<String> {
+        val resp = send(LIST_INS)
+
+        return mutableListOf<String>().apply {
+            while (resp.hasRemaining()) {
+                val nameBytes = resp.parseTlv(NAME_LIST_TAG)
+                add(String(nameBytes, 1, nameBytes.size - 1)) //First byte is algorithm
+            }
+        }
+    }
+
+   @Throws(IOException::class)
+    fun putCode(name: String, key: ByteArray, type: OathType, algorithm: Algorithm, digits: Byte, imf: Int, touch: Boolean) {
+        //send(tag, 0xa4.toByte(), p1 = 0x04) { put(AID) }
+        //if (touch && deviceInfo.version.major < 4) {
+        //    throw IllegalArgumentException("Require touch requires YubiKey 4")
+        //}
+        //try {
+            send(PUT_INS) {
+                tlv(NAME_TAG, name.toByteArray())
+                tlv(KEY_TAG, byteArrayOf(type.byteVal or algorithm.byteVal, digits) + algorithm.prepareKey(key))
+                if (touch) put(PROPERTY_TAG).put(REQUIRE_TOUCH_PROP)
+                if (type == OathType.HOTP && imf > 0) put(IMF_TAG).put(4).putInt(imf)
+            }
+        //} catch (e: ApduError) {
+        //    throw if (e.status == APDU_FILE_FULL) StorageFullException("No more room for OATH credentials!") else e
+        //}
+    }
+
+    /*fun deleteCode(name: String) {
+        send(DELETE_INS) { tlv(NAME_TAG, name.toByteArray()) }
+    }*/
+
+    fun calculate(name: String, challenge: ByteArray, truncate: Boolean = true): ByteArray {
+        val resp = send(CALCULATE_INS, p2 = if (truncate) 1 else 0) {
+            tlv(NAME_TAG, name.toByteArray())
+            tlv(CHALLENGE_TAG, challenge)
+        }
+        return resp.parseTlv(resp.slice().get())
+    }
+
+    /*fun calculateAll(challenge: ByteArray): List<ResponseData> {
+        val resp = send(CALCULATE_ALL_INS, p2 = 1) {
+            tlv(CHALLENGE_TAG, challenge)
+        }
+
+        return mutableListOf<ResponseData>().apply {
+            while (resp.hasRemaining()) {
+                val name = String(resp.parseTlv(NAME_TAG))
+                val respType = resp.slice().get()  // Peek
+                val hashBytes = resp.parseTlv(respType)
+                val oathType = if (respType == NO_RESPONSE_TAG) OathType.HOTP else OathType.TOTP
+                val touch = respType == TOUCH_TAG
+
+                add(ResponseData(name, oathType, touch, hashBytes))
+            }
+        }
+    }*/
+    @Throws(IOException::class)
+    private fun send(ins: Byte, p1: Byte = 0, p2: Byte = 0, data: ByteBuffer.() -> Unit = {}): ByteBuffer {
+        val apdu = ByteBuffer.allocate(256).put(0).put(ins).put(p1).put(p2).put(0).apply(data).let {
+            it.put(4, (it.position() - 5).toByte()).array().copyOfRange(0, it.position())
+        }
+
+        return ByteBuffer.allocate(4096).apply {
+            var resp = splitApduResponse(tag.transceive(apdu))
+            while (resp.status != APDU_OK) {
+                if ((resp.status shr 8).toByte() == APDU_DATA_REMAINING_SW1) {
+                    put(resp.data)
+                    resp = splitApduResponse(tag.transceive(byteArrayOf(0, SEND_REMAINING_INS, 0, 0)))
+                } else {
+                    throw IOException(""+resp.status)
+                }
+            }
+            put(resp.data).limit(position()).rewind()
+        }
+    }
+
+    override fun close() {
+        /*backend.close()
+        backend = object : Backend {
+            override val persistent: Boolean = false
+            override fun sendApdu(apdu: ByteArray): ByteArray = throw IOException("SENDING APDU ON CLOSED BACKEND!")
+            override fun close() = throw IOException("Backend already closed!")
+        }*/
+    }
+
+    data class Version(val major: Int, val minor: Int, val micro: Int) {
+        companion object {
+            fun parse(data: ByteArray): Version = Version(data[0].toInt(), data[1].toInt(), data[2].toInt())
+        }
+
+        override fun toString(): String = "%d.%d.%d".format(major, minor, micro)
+
+        fun compare(major: Int, minor: Int, micro: Int): Int {
+            return if (major > this.major || (major == this.major && (minor > this.minor || minor == this.minor && micro > this.micro))) {
+                -1
+            } else if (major == this.major && minor == this.minor && micro == this.micro) {
+                0
+            } else {
+                1
+            }
+        }
+
+        fun compare(version: Version): Int = compare(version.major, version.minor, version.micro)
+    }
+
+    class DeviceInfo(val id: String, val persistent: Boolean, val version: Version, initialHasPassword: Boolean) {
+        var hasPassword = initialHasPassword
+            internal set
+    }
+
+    class ResponseData(val key: String, val oathType: OathType, val touch: Boolean, val data: ByteArray)
+
+    private infix fun Byte.or(b: Byte): Byte = (toInt() or b.toInt()).toByte()
+
+    companion object {
+        const private val APDU_OK = 0x9000
+        const private val APDU_FILE_FULL = 0x6a84
+        const private val APDU_DATA_REMAINING_SW1 = 0x61.toByte()
+
+        const private val NAME_TAG: Byte = 0x71
+        const private val NAME_LIST_TAG: Byte = 0x72
+        const private val KEY_TAG: Byte = 0x73
+        const private val CHALLENGE_TAG: Byte = 0x74
+        const private val RESPONSE_TAG: Byte = 0x75
+        const private val T_RESPONSE_TAG: Byte = 0x76
+        const private val NO_RESPONSE_TAG: Byte = 0x77
+        const private val PROPERTY_TAG: Byte = 0x78
+        const private val VERSION_TAG: Byte = 0x79
+        const private val IMF_TAG: Byte = 0x7a
+        const private val TOUCH_TAG: Byte = 0x7c
+
+        const private val ALWAYS_INCREASING_PROP: Byte = 0x01
+        const private val REQUIRE_TOUCH_PROP: Byte = 0x02
+
+        const private val PUT_INS: Byte = 0x01
+        const private val DELETE_INS: Byte = 0x02
+        const private val SET_CODE_INS: Byte = 0x03
+        const private val RESET_INS: Byte = 0x04
+
+        const private val LIST_INS = 0xa1.toByte()
+        const private val CALCULATE_INS = 0xa2.toByte()
+        const private val VALIDATE_INS = 0xa3.toByte()
+        const private val CALCULATE_ALL_INS = 0xa4.toByte()
+        const private val SEND_REMAINING_INS = 0xa5.toByte()
+
+        private val AID = byteArrayOf(0xa0.toByte(), 0x00, 0x00, 0x05, 0x27, 0x21, 0x01, 0x01)
+
+        private fun getDeviceId(id: ByteArray): String {
+            val digest = MessageDigest.getInstance("SHA256").apply {
+                update(id)
+            }.digest()
+
+            return Base64.encodeToString(digest.sliceArray(0 until 16), Base64.NO_PADDING or Base64.NO_WRAP)
+        }
+
+        @Throws(IOException::class)
+        private fun ByteBuffer.parseTlv(tag: Byte): ByteArray {
+            val readTag = get()
+            if (readTag != tag) {
+                throw IOException("Required tag: %02x, got %02x".format(tag, readTag))
+            }
+            return ByteArray(0xff and get().toInt()).apply { get(this) }
+        }
+
+        private fun ByteBuffer.tlv(tag: Byte, data: ByteArray = byteArrayOf()): ByteBuffer {
+            return put(tag).put(data.size.toByte()).put(data)
+        }
+
+        private data class Response(val data: ByteArray, val status: Int)
+
+        private fun splitApduResponse(resp: ByteArray): Response {
+            return Response(
+                    resp.copyOfRange(0, resp.size - 2),
+                    ((0xff and resp[resp.size - 2].toInt()) shl 8) or (0xff and resp[resp.size - 1].toInt()))
+        }
+    }
+}

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

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:gravity="center"
+        android:padding="5dp"
+        android:background="@color/colorPrimary">
+        <TextView
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Please tap pocket!"/>
+    </LinearLayout>
+</LinearLayout>

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

@@ -68,7 +68,7 @@
         android:layout_width="match_parent"
         android:layout_height="140dp"
         android:background="@color/lightGray"
-        android:visibility="gone"
+        android:visibility="visible"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent" />
@@ -107,10 +107,9 @@
         android:id="@+id/etPocketPassword"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:inputType="numberPassword"
-        app:layout_constraintTop_toBottomOf="@id/tvPocketSecurityUser"
-        app:layout_constraintStart_toStartOf="@id/tvPocketSecurity"
         app:layout_constraintEnd_toEndOf="@id/sPocketSecurity"
+        app:layout_constraintStart_toStartOf="@id/tvPocketSecurity"
+        app:layout_constraintTop_toBottomOf="@id/tvPocketSecurityUser"
         tools:ignore="LabelFor" />
 
 </android.support.constraint.ConstraintLayout>

app/src/main/res/xml/tech.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <tech-list>
+        <tech>android.nfc.tech.MifareUltralight</tech>
+        <tech>android.nfc.tech.Ndef</tech>
+        <tech>android.nfc.tech.NfcA</tech>
+    </tech-list>
+    <tech-list>
+        <tech>android.nfc.tech.MifareClassic</tech>
+        <tech>android.nfc.tech.Ndef</tech>
+        <tech>android.nfc.tech.NfcA</tech>
+    </tech-list>
+</resources>

build.gradle

@@ -6,6 +6,7 @@ buildscript {
         jcenter()
         google()
     }
+    ext.kotlin_version = '1.2.51'
     dependencies {
         classpath 'com.android.tools.build:gradle:3.1.4'
         classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'