bump version v1.11.6

and refactor displayAmount

app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "com.m2049r.xmrwallet"
         minSdkVersion 21
         targetSdkVersion 28
-        versionCode 166
-        versionName "1.10.16 'Node-O-matiC'"
+        versionCode 176
+        versionName "1.11.6 'Chernushka'"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         externalNativeBuild {
@@ -115,6 +115,10 @@ dependencies {
     implementation 'org.slf4j:slf4j-nop:1.7.25'
     implementation 'com.github.brnunes:swipeablerecyclerview:1.0.2'
 
+    // https://mvnrepository.com/artifact/com.github.aelstad/keccakj
+    implementation 'com.github.aelstad:keccakj:1.1.0'
+
+
     testImplementation "junit:junit:$rootProject.ext.junitVersion"
     testImplementation "org.mockito:mockito-all:$rootProject.ext.mockitoVersion"
     testImplementation "com.squareup.okhttp3:mockwebserver:$rootProject.ext.okHttpVersion"

app/src/main/AndroidManifest.xml

@@ -26,14 +26,14 @@
             android:configChanges="orientation|keyboardHidden"
             android:label="@string/wallet_activity_name"
             android:launchMode="singleTask"
-            android:screenOrientation="portrait" />
+            android:screenOrientation="behind" />
 
         <activity
             android:name=".LoginActivity"
             android:configChanges="orientation|keyboardHidden"
             android:label="@string/app_name"
             android:launchMode="singleTop"
-            android:screenOrientation="portrait">
+            android:screenOrientation="locked">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
@@ -68,5 +68,15 @@
             android:description="@string/service_description"
             android:exported="false"
             android:label="Monero Wallet Service" />
+
+        <provider
+            android:name="android.support.v4.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/filepaths" />
+        </provider>
     </application>
 </manifest>

app/src/main/cpp/monerujo.h

@@ -60,14 +60,14 @@ enum {
     HASH_DATA_AREA = 136
 };
 
-void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed);
+void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed, uint64_t height);
 
 inline void slow_hash(const void *data, const size_t length, char *hash) {
-    cn_slow_hash(data, length, hash, 0 /* variant */, 0/*prehashed*/);
+    cn_slow_hash(data, length, hash, 0 /*variant*/, 0 /*prehashed*/, 0 /*height*/);
 }
 
 inline void slow_hash_broken(const void *data, char *hash, int variant) {
-    cn_slow_hash(data, 200 /*sizeof(union hash_state)*/, hash, variant, 1 /*prehashed*/);
+    cn_slow_hash(data, 200 /*sizeof(union hash_state)*/, hash, variant, 1 /*prehashed*/, 0 /*height*/);
 }
 
 #ifdef __cplusplus

app/src/main/java/com/m2049r/levin/util/LevinReader.java

@@ -173,10 +173,10 @@ public class LevinReader {
 
     // this should be in LittleEndianDataInputStream because it has little
     // endian logic
-    private long readRest(int firstByte, int bytes) throws IOException {
+    private long readRest(final int firstByte, final int bytes) throws IOException {
         long result = firstByte;
-        for (int i = 0; i < bytes; i++) {
-            result = result + (in.readUnsignedByte() << 8);
+        for (int i = 1; i < bytes + 1; i++) {
+            result = result + (((long) in.readUnsignedByte()) << (8 * i));
         }
         return result;
     }

app/src/main/java/com/m2049r/xmrwallet/GenerateFragment.java

@@ -16,6 +16,7 @@
 
 package com.m2049r.xmrwallet;
 
+import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
@@ -33,6 +34,7 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.Button;
 import android.widget.LinearLayout;
@@ -45,6 +47,7 @@ import com.m2049r.xmrwallet.util.FingerprintHelper;
 import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.util.KeyStoreHelper;
 import com.m2049r.xmrwallet.util.RestoreHeight;
+import com.m2049r.xmrwallet.util.ledger.Monero;
 import com.m2049r.xmrwallet.widget.Toolbar;
 import com.nulabinc.zxcvbn.Strength;
 import com.nulabinc.zxcvbn.Zxcvbn;
@@ -95,7 +98,6 @@ public class GenerateFragment extends Fragment {
         etWalletRestoreHeight = view.findViewById(R.id.etWalletRestoreHeight);
         bGenerate = view.findViewById(R.id.bGenerate);
 
-        etWalletMnemonic.getEditText().setRawInputType(InputType.TYPE_CLASS_TEXT);
         etWalletAddress.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
         etWalletViewKey.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
         etWalletSpendKey.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
@@ -241,9 +243,7 @@ public class GenerateFragment extends Fragment {
                 }
             });
             etWalletAddress.setVisibility(View.VISIBLE);
-            etWalletAddress.getEditText().setOnEditorActionListener(new TextView.OnEditorActionListener()
-
-            {
+            etWalletAddress.getEditText().setOnEditorActionListener(new TextView.OnEditorActionListener() {
                 public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                     if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
                             || (actionId == EditorInfo.IME_ACTION_NEXT)) {
@@ -275,9 +275,7 @@ public class GenerateFragment extends Fragment {
         }
         if (type.equals(TYPE_KEY)) {
             etWalletSpendKey.setVisibility(View.VISIBLE);
-            etWalletSpendKey.getEditText().setOnEditorActionListener(new TextView.OnEditorActionListener()
-
-            {
+            etWalletSpendKey.getEditText().setOnEditorActionListener(new TextView.OnEditorActionListener() {
                 public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                     if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
                             || (actionId == EditorInfo.IME_ACTION_NEXT)) {
@@ -304,9 +302,7 @@ public class GenerateFragment extends Fragment {
                 }
             });
         }
-        bGenerate.setOnClickListener(new View.OnClickListener()
-
-        {
+        bGenerate.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Helper.hideKeyboard(getActivity());
@@ -617,4 +613,80 @@ public class GenerateFragment extends Fragment {
         }
         super.onCreateOptionsMenu(menu, inflater);
     }
+
+    AlertDialog ledgerDialog = null;
+
+    public void convertLedgerSeed() {
+        if (ledgerDialog != null) return;
+        final Activity activity = getActivity();
+        View promptsView = getLayoutInflater().inflate(R.layout.prompt_ledger_seed, null);
+        android.app.AlertDialog.Builder alertDialogBuilder = new android.app.AlertDialog.Builder(activity);
+        alertDialogBuilder.setView(promptsView);
+
+        final TextInputLayout etSeed = promptsView.findViewById(R.id.etSeed);
+        final TextInputLayout etPassphrase = promptsView.findViewById(R.id.etPassphrase);
+
+        etSeed.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable s) {
+                if (etSeed.getError() != null) {
+                    etSeed.setError(null);
+                }
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start,
+                                          int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start,
+                                      int before, int count) {
+            }
+        });
+
+        alertDialogBuilder
+                .setCancelable(false)
+                .setPositiveButton(getString(R.string.label_ok), null)
+                .setNegativeButton(getString(R.string.label_cancel),
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int id) {
+                                Helper.hideKeyboardAlways(activity);
+                                etWalletMnemonic.getEditText().getText().clear();
+                                dialog.cancel();
+                                ledgerDialog = null;
+                            }
+                        });
+
+        ledgerDialog = alertDialogBuilder.create();
+
+        ledgerDialog.setOnShowListener(new DialogInterface.OnShowListener() {
+            @Override
+            public void onShow(DialogInterface dialog) {
+                Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
+                button.setOnClickListener(new View.OnClickListener() {
+                    @Override
+                    public void onClick(View view) {
+                        String ledgerSeed = etSeed.getEditText().getText().toString();
+                        String ledgerPassphrase = etPassphrase.getEditText().getText().toString();
+                        String moneroSeed = Monero.convert(ledgerSeed, ledgerPassphrase);
+                        if (moneroSeed != null) {
+                            etWalletMnemonic.getEditText().setText(moneroSeed);
+                            ledgerDialog.dismiss();
+                            ledgerDialog = null;
+                        } else {
+                            etSeed.setError(getString(R.string.bad_ledger_seed));
+                        }
+                    }
+                });
+            }
+        });
+
+        // set FLAG_SECURE to prevent screenshots in Release Mode
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+            ledgerDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
+        ledgerDialog.show();
+    }
 }

app/src/main/java/com/m2049r/xmrwallet/GenerateReviewFragment.java

@@ -33,6 +33,7 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.Button;
 import android.widget.ImageButton;
@@ -620,6 +621,11 @@ public class GenerateReviewFragment extends Fragment {
                 return false;
             }
         });
+        // set FLAG_SECURE to prevent screenshots in Release Mode
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+            openDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
         return openDialog;
     }
 

app/src/main/java/com/m2049r/xmrwallet/LoginActivity.java

@@ -1229,6 +1229,12 @@ public class LoginActivity extends BaseActivity
             case R.id.action_language:
                 onChangeLocale();
                 return true;
+            case R.id.action_ledger_seed:
+                Fragment f = getSupportFragmentManager().findFragmentById(R.id.fragment_container);
+                if (f instanceof GenerateFragment) {
+                    ((GenerateFragment) f).convertLedgerSeed();
+                }
+                return true;
             default:
                 return super.onOptionsItemSelected(item);
         }
@@ -1361,30 +1367,31 @@ public class LoginActivity extends BaseActivity
     };
 
     private void connectLedger(UsbManager usbManager, final UsbDevice usbDevice) {
-        try {
-            Ledger.connect(usbManager, usbDevice);
-            registerDetachReceiver();
-            onLedgerAction();
-            runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    Toast.makeText(LoginActivity.this,
-                            getString(R.string.toast_ledger_attached, usbDevice.getProductName()),
-                            Toast.LENGTH_SHORT)
-                            .show();
-                }
-            });
-        } catch (IOException ex) {
-            runOnUiThread(new Runnable() {
-                @Override
-                public void run() {
-                    Toast.makeText(LoginActivity.this,
-                            getString(R.string.open_wallet_ledger_missing),
-                            Toast.LENGTH_SHORT)
-                            .show();
-                }
-            });
-        }
+        if (Ledger.ENABLED)
+            try {
+                Ledger.connect(usbManager, usbDevice);
+                registerDetachReceiver();
+                onLedgerAction();
+                runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        Toast.makeText(LoginActivity.this,
+                                getString(R.string.toast_ledger_attached, usbDevice.getProductName()),
+                                Toast.LENGTH_SHORT)
+                                .show();
+                    }
+                });
+            } catch (IOException ex) {
+                runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        Toast.makeText(LoginActivity.this,
+                                getString(R.string.open_wallet_ledger_missing),
+                                Toast.LENGTH_SHORT)
+                                .show();
+                    }
+                });
+            }
     }
 
     @Override

app/src/main/java/com/m2049r/xmrwallet/NodeFragment.java

@@ -32,6 +32,7 @@ import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.Button;
 import android.widget.TextView;
@@ -505,6 +506,10 @@ public class NodeFragment extends Fragment
                     });
                 }
             });
+            // set FLAG_SECURE to prevent screenshots in Release Mode
+            if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+                editDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+            }
 
             etNodePass.getEditText().setOnEditorActionListener(new TextView.OnEditorActionListener() {
                 public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {

app/src/main/java/com/m2049r/xmrwallet/ReceiveFragment.java

@@ -17,19 +17,28 @@
 package com.m2049r.xmrwallet;
 
 import android.content.Context;
+import android.content.Intent;
 import android.graphics.Bitmap;
 import android.graphics.Canvas;
 import android.graphics.drawable.BitmapDrawable;
+import android.net.Uri;
 import android.nfc.NfcManager;
 import android.os.AsyncTask;
 import android.os.Bundle;
+import android.support.annotation.Nullable;
 import android.support.design.widget.TextInputLayout;
 import android.support.v4.app.Fragment;
+import android.support.v4.content.FileProvider;
+import android.support.v4.view.MenuItemCompat;
+import android.support.v7.widget.ShareActionProvider;
 import android.text.Editable;
 import android.text.InputType;
 import android.text.TextWatcher;
 import android.view.KeyEvent;
 import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.EditorInfo;
@@ -56,6 +65,9 @@ import com.m2049r.xmrwallet.util.MoneroThreadPoolExecutor;
 import com.m2049r.xmrwallet.widget.ExchangeView;
 import com.m2049r.xmrwallet.widget.Toolbar;
 
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -69,8 +81,8 @@ public class ReceiveFragment extends Fragment {
     private TextInputLayout etNotes;
     private ExchangeView evAmount;
     private TextView tvQrCode;
-    private ImageView qrCode;
-    private ImageView qrCodeFull;
+    private ImageView ivQrCode;
+    private ImageView ivQrCodeFull;
     private EditText etDummy;
     private ImageButton bCopyAddress;
     private Button bSubaddress;
@@ -97,9 +109,9 @@ public class ReceiveFragment extends Fragment {
         tvAddress = view.findViewById(R.id.tvAddress);
         etNotes = view.findViewById(R.id.etNotes);
         evAmount = view.findViewById(R.id.evAmount);
-        qrCode = view.findViewById(R.id.qrCode);
+        ivQrCode = view.findViewById(R.id.qrCode);
         tvQrCode = view.findViewById(R.id.tvQrCode);
-        qrCodeFull = view.findViewById(R.id.qrCodeFull);
+        ivQrCodeFull = view.findViewById(R.id.qrCodeFull);
         etDummy = view.findViewById(R.id.etDummy);
         bCopyAddress = view.findViewById(R.id.bCopyAddress);
         bSubaddress = view.findViewById(R.id.bSubaddress);
@@ -178,25 +190,25 @@ public class ReceiveFragment extends Fragment {
             }
         });
 
-        qrCode.setOnClickListener(new View.OnClickListener() {
+        ivQrCode.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 Helper.hideKeyboard(getActivity());
                 etDummy.requestFocus();
                 if (qrValid) {
-                    qrCodeFull.setImageBitmap(((BitmapDrawable) qrCode.getDrawable()).getBitmap());
-                    qrCodeFull.setVisibility(View.VISIBLE);
+                    ivQrCodeFull.setImageBitmap(((BitmapDrawable) ivQrCode.getDrawable()).getBitmap());
+                    ivQrCodeFull.setVisibility(View.VISIBLE);
                 } else {
                     evAmount.doExchange();
                 }
             }
         });
 
-        qrCodeFull.setOnClickListener(new View.OnClickListener() {
+        ivQrCodeFull.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                qrCodeFull.setImageBitmap(null);
-                qrCodeFull.setVisibility(View.GONE);
+                ivQrCodeFull.setImageBitmap(null);
+                ivQrCodeFull.setVisibility(View.GONE);
             }
         });
 
@@ -228,6 +240,81 @@ public class ReceiveFragment extends Fragment {
         return view;
     }
 
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    private ShareActionProvider shareActionProvider;
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, final MenuInflater inflater) {
+        inflater.inflate(R.menu.receive_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+
+        // Locate MenuItem with ShareActionProvider
+        MenuItem item = menu.findItem(R.id.menu_item_share);
+
+        // Fetch and store ShareActionProvider
+        shareActionProvider = (ShareActionProvider) MenuItemCompat.getActionProvider(item);
+
+        shareActionProvider.setOnShareTargetSelectedListener(new ShareActionProvider.OnShareTargetSelectedListener() {
+            @Override
+            public boolean onShareTargetSelected(ShareActionProvider shareActionProvider, Intent intent) {
+                saveQrCode(); // save it only if we need it
+                return false;
+            }
+        });
+    }
+
+    private void setShareIntent() {
+        if (shareActionProvider != null) {
+            if (qrValid) {
+                shareActionProvider.setShareIntent(getShareIntent());
+            } else {
+                shareActionProvider.setShareIntent(null);
+            }
+        }
+    }
+
+    private void saveQrCode() {
+        if (!qrValid) throw new IllegalStateException("trying to save null qr code!");
+
+        File cachePath = new File(getActivity().getCacheDir(), "images");
+        if (!cachePath.exists())
+            if (!cachePath.mkdirs()) throw new IllegalStateException("cannot create images folder");
+        File png = new File(cachePath, "QR.png");
+        try {
+            FileOutputStream stream = new FileOutputStream(png);
+            Bitmap qrBitmap = ((BitmapDrawable) ivQrCode.getDrawable()).getBitmap();
+            qrBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
+            stream.close();
+        } catch (IOException ex) {
+            Timber.e(ex);
+            // make sure we don't share an old qr code
+            if (!png.delete()) throw new IllegalStateException("cannot delete old qr code");
+            // if we manage to delete it, the URI points to nothing and the user gets a toast with the error
+        }
+    }
+
+    private Intent getShareIntent() {
+        File imagePath = new File(getActivity().getCacheDir(), "images");
+        File png = new File(imagePath, "QR.png");
+        Uri contentUri = FileProvider.getUriForFile(getActivity(),
+                BuildConfig.APPLICATION_ID + ".fileprovider", png);
+        if (contentUri != null) {
+            Intent shareIntent = new Intent();
+            shareIntent.setAction(Intent.ACTION_SEND);
+            shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); // temp permission for receiving app to read this file
+            shareIntent.setDataAndType(contentUri, getActivity().getContentResolver().getType(contentUri));
+            shareIntent.putExtra(Intent.EXTRA_STREAM, contentUri);
+            shareIntent.putExtra(Intent.EXTRA_TEXT, bcData.getUriString());
+            return shareIntent;
+        }
+        return null;
+    }
+
     void enableSubaddressButton(boolean enable) {
         bSubaddress.setEnabled(enable);
         if (enable) {
@@ -242,23 +329,23 @@ public class ReceiveFragment extends Fragment {
         Toast.makeText(getActivity(), getString(R.string.message_copy_address), Toast.LENGTH_SHORT).show();
     }
 
-    boolean qrValid = true;
+    private boolean qrValid = false;
 
     void clearQR() {
         if (qrValid) {
-            qrCode.setImageBitmap(null);
+            ivQrCode.setImageBitmap(null);
             qrValid = false;
+            setShareIntent();
             if (isLoaded)
                 tvQrCode.setVisibility(View.VISIBLE);
         }
     }
 
     void setQR(Bitmap qr) {
-        qrCode.setImageBitmap(qr);
+        ivQrCode.setImageBitmap(qr);
         qrValid = true;
+        setShareIntent();
         tvQrCode.setVisibility(View.GONE);
-        Helper.hideKeyboard(getActivity());
-        etDummy.requestFocus();
     }
 
     @Override
@@ -392,7 +479,7 @@ public class ReceiveFragment extends Fragment {
             return;
         }
         bcData = new BarcodeData(BarcodeData.Asset.XMR, address, null, notes, xmrAmount);
-        int size = Math.min(qrCode.getHeight(), qrCode.getWidth());
+        int size = Math.max(ivQrCode.getWidth(), ivQrCode.getHeight());
         Bitmap qr = generate(bcData.getUriString(), size, size);
         if (qr != null) {
             setQR(qr);
@@ -422,8 +509,8 @@ public class ReceiveFragment extends Fragment {
             Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);
             bitmap = addLogo(bitmap);
             return bitmap;
-        } catch (WriterException e) {
-            e.printStackTrace();
+        } catch (WriterException ex) {
+            Timber.e(ex);
         }
         return null;
     }
@@ -487,6 +574,7 @@ public class ReceiveFragment extends Fragment {
     @Override
     public void onPause() {
         Timber.d("onPause()");
+        Helper.hideKeyboard(getActivity());
         super.onPause();
     }
 

app/src/main/java/com/m2049r/xmrwallet/SecureActivity.java

@@ -31,7 +31,7 @@ public abstract class SecureActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
 
         // set FLAG_SECURE to prevent screenshots in Release Mode
-        if (!BuildConfig.DEBUG && !BuildConfig.FLAVOR_type.equals("alpha")) {
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
             getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
         }
     }

app/src/main/java/com/m2049r/xmrwallet/TxFragment.java

@@ -71,7 +71,6 @@ public class TxFragment extends Fragment {
     private TextView tvTxFee;
     private TextView tvTxTransfers;
     private TextView etTxNotes;
-    private Button bTxNotes;
 
     // XMRTO stuff
     private View cvXmrTo;
@@ -102,21 +101,9 @@ public class TxFragment extends Fragment {
         tvTxFee = view.findViewById(R.id.tvTxFee);
         tvTxTransfers = view.findViewById(R.id.tvTxTransfers);
         etTxNotes = view.findViewById(R.id.etTxNotes);
-        bTxNotes = view.findViewById(R.id.bTxNotes);
 
         etTxNotes.setRawInputType(InputType.TYPE_CLASS_TEXT);
 
-        bTxNotes.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                info.notes = null; // force reload on next view
-                bTxNotes.setEnabled(false);
-                etTxNotes.setEnabled(false);
-                userNotes.setNote(etTxNotes.getText().toString());
-                activityCallback.onSetNote(info.hash, userNotes.txNotes);
-            }
-        });
-
         tvTxXmrToKey.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
@@ -131,14 +118,6 @@ public class TxFragment extends Fragment {
         return view;
     }
 
-    public void onNotesSet(boolean reload) {
-        bTxNotes.setEnabled(true);
-        etTxNotes.setEnabled(true);
-        if (reload) {
-            loadNotes(this.info);
-        }
-    }
-
     void shareTxInfo() {
         if (this.info == null) return;
         StringBuffer sb = new StringBuffer();
@@ -315,7 +294,6 @@ public class TxFragment extends Fragment {
         }
     }
 
-
     @Override
     public void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -337,9 +315,9 @@ public class TxFragment extends Fragment {
 
         String getTxNotes(String hash);
 
-        String getTxAddress(int major, int minor);
+        boolean setTxNotes(String txId, String txNotes);
 
-        void onSetNote(String txId, String notes);
+        String getTxAddress(int major, int minor);
 
         void setToolbarButton(int type);
 
@@ -357,4 +335,16 @@ public class TxFragment extends Fragment {
                     + " must implement Listener");
         }
     }
-}
+
+    @Override
+    public void onPause() {
+        if (!etTxNotes.getText().toString().equals(userNotes.note)) { // notes have changed
+            // save them
+            userNotes.setNote(etTxNotes.getText().toString());
+            info.notes = userNotes.txNotes;
+            activityCallback.setTxNotes(info.hash, info.notes);
+        }
+        Helper.hideKeyboard(getActivity());
+        super.onPause();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/WalletActivity.java

@@ -150,8 +150,13 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
         final WalletFragment walletFragment = (WalletFragment)
                 getSupportFragmentManager().findFragmentByTag(WalletFragment.class.getName());
         if (walletFragment != null) walletFragment.resetDismissedTransactions();
-        updateAccountsBalance();
         forceUpdate();
+        runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                updateAccountsBalance();
+            }
+        });
     }
 
     @Override
@@ -174,6 +179,11 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
         return getWallet().getUserNote(txId);
     }
 
+    @Override
+    public boolean setTxNotes(String txId, String txNotes) {
+        return getWallet().setUserNote(txId, txNotes);
+    }
+
     @Override
     public String getTxAddress(int major, int minor) {
         return getWallet().getSubaddress(major, minor);
@@ -713,26 +723,6 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
         }
     }
 
-    @Override
-    public void onSetNotes(final boolean success) {
-        try {
-            final TxFragment txFragment = (TxFragment)
-                    getSupportFragmentManager().findFragmentById(R.id.fragment_container);
-            runOnUiThread(new Runnable() {
-                public void run() {
-                    if (!success) {
-                        Toast.makeText(WalletActivity.this, getString(R.string.tx_notes_set_failed), Toast.LENGTH_LONG).show();
-                    }
-                    txFragment.onNotesSet(success);
-                }
-            });
-        } catch (ClassCastException ex) {
-            // not in tx fragment
-            Timber.d(ex.getLocalizedMessage());
-            // never mind
-        }
-    }
-
     @Override
     public void onProgress(final String text) {
         try {
@@ -794,21 +784,6 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
 
     }
 
-    @Override
-    public void onSetNote(String txId, String notes) {
-        if (mIsBound) { // no point in talking to unbound service
-            Intent intent = new Intent(getApplicationContext(), WalletService.class);
-            intent.putExtra(WalletService.REQUEST, WalletService.REQUEST_CMD_SETNOTE);
-            intent.putExtra(WalletService.REQUEST_CMD_SETNOTE_TX, txId);
-            intent.putExtra(WalletService.REQUEST_CMD_SETNOTE_NOTES, notes);
-            startService(intent);
-            Timber.d("SET NOTE request sent");
-        } else {
-            Timber.e("Service not bound");
-        }
-
-    }
-
     @Override
     public void onPrepareSend(final String tag, final TxData txData) {
         if (mIsBound) { // no point in talking to unbound service
@@ -1062,6 +1037,7 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
         } else {
             tvBalance.setText(null);
         }
+        updateAccountsList();
     }
 
     void updateAccountsHeader() {
@@ -1075,8 +1051,11 @@ public class WalletActivity extends BaseActivity implements WalletFragment.Liste
         Menu menu = accountsView.getMenu();
         menu.removeGroup(R.id.accounts_list);
         final int n = wallet.getNumAccounts();
+        final boolean showBalances = (n > 1) && !isStreetMode();
         for (int i = 0; i < n; i++) {
-            final String label = wallet.getAccountLabel(i);
+            final String label = (showBalances ?
+                    getString(R.string.label_account, wallet.getAccountLabel(i), Helper.getDisplayAmount(wallet.getBalance(i), 2))
+                    : wallet.getAccountLabel(i));
             final MenuItem item = menu.add(R.id.accounts_list, getAccountId(i), 2 * i, label);
             item.setIcon(R.drawable.ic_account_balance_wallet_black_24dp);
             if (i == wallet.getAccountIndex())

app/src/main/java/com/m2049r/xmrwallet/WalletFragment.java

@@ -219,7 +219,7 @@ public class WalletFragment extends Fragment
         if (isExchanging) return; // wait for exchange to finish - it will fire this itself then.
         // at this point selection is XMR in case of error
         String displayB;
-        double amountA = Double.parseDouble(Wallet.getDisplayAmount(unlockedBalance)); // crash if this fails!
+        double amountA = Helper.getDecimalAmount(unlockedBalance).doubleValue();
         if (!Helper.CRYPTO.equals(balanceCurrency)) { // not XMR
             double amountB = amountA * balanceRate;
             displayB = Helper.getFormattedAmount(amountB, false);
@@ -235,10 +235,10 @@ public class WalletFragment extends Fragment
     private final ExchangeApi exchangeApi = Helper.getExchangeApi();
 
     void refreshBalance() {
-        double unconfirmedXmr = Double.parseDouble(Helper.getDisplayAmount(balance - unlockedBalance));
+        double unconfirmedXmr = Helper.getDecimalAmount(balance - unlockedBalance).doubleValue();
         showUnconfirmed(unconfirmedXmr);
         if (sCurrency.getSelectedItemPosition() == 0) { // XMR
-            double amountXmr = Double.parseDouble(Wallet.getDisplayAmount(unlockedBalance)); // assume this cannot fail!
+            double amountXmr = Helper.getDecimalAmount(unlockedBalance).doubleValue();
             showBalance(Helper.getFormattedAmount(amountXmr, true));
         } else { // not XMR
             String currency = (String) sCurrency.getSelectedItem();
@@ -294,7 +294,7 @@ public class WalletFragment extends Fragment
 
     public void exchangeFailed() {
         sCurrency.setSelection(0, true); // default to XMR
-        double amountXmr = Double.parseDouble(Wallet.getDisplayAmount(unlockedBalance)); // assume this cannot fail!
+        double amountXmr = Helper.getDecimalAmount(unlockedBalance).doubleValue();
         showBalance(Helper.getFormattedAmount(amountXmr, true));
         hideExchanging();
     }

app/src/main/java/com/m2049r/xmrwallet/data/NodeInfo.java

@@ -46,7 +46,8 @@ import okhttp3.ResponseBody;
 import timber.log.Timber;
 
 public class NodeInfo extends Node {
-    final static public int MIN_MAJOR_VERSION = 9;
+    final static public int MIN_MAJOR_VERSION = 11;
+    final static public String RPC_VERSION = "2.0";
 
     private long height = 0;
     private long timestamp = 0;
@@ -228,9 +229,12 @@ public class NodeInfo extends Node {
                 responseCode = response.code();
                 if (response.isSuccessful()) {
                     ResponseBody respBody = response.body(); // closed through Response object
-                    if ((respBody != null) && (respBody.contentLength() < 1000)) { // sanity check
+                    if ((respBody != null) && (respBody.contentLength() < 2000)) { // sanity check
                         final JSONObject json = new JSONObject(
                                 respBody.string());
+                        String rpcVersion = json.getString("jsonrpc");
+                        if (!RPC_VERSION.equals(rpcVersion))
+                            return false;
                         final JSONObject header = json.getJSONObject(
                                 "result").getJSONObject("block_header");
                         height = header.getLong("height");

app/src/main/java/com/m2049r/xmrwallet/dialog/ProgressDialog.java

@@ -22,11 +22,11 @@ import android.content.Context;
 import android.os.Bundle;
 import android.view.LayoutInflater;
 import android.view.View;
-import android.view.ViewGroup;
-import android.widget.FrameLayout;
+import android.view.WindowManager;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 
+import com.m2049r.xmrwallet.BuildConfig;
 import com.m2049r.xmrwallet.R;
 
 import java.util.Locale;
@@ -62,9 +62,6 @@ public class ProgressDialog extends AlertDialog {
         pbBar = view.findViewById(R.id.pbBar);
         tvProgress = view.findViewById(R.id.tvProgress);
         setView(view);
-        //setTitle("blabla");
-        //super.setMessage("bubbu");
-//        view.invalidate();
         setIndeterminate(indeterminate);
         if (maxValue > 0) {
             setMax(maxValue);
@@ -78,6 +75,11 @@ public class ProgressDialog extends AlertDialog {
         }
 
         super.onCreate(savedInstanceState);
+
+        // set FLAG_SECURE to prevent screenshots in Release Mode
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+            getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
     }
 
     public void setProgress(int value, int max) {

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendBtcConfirmWizardFragment.java

@@ -27,11 +27,13 @@ import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.Button;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.m2049r.xmrwallet.BuildConfig;
 import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.data.TxData;
 import com.m2049r.xmrwallet.data.TxDataBtc;
@@ -435,6 +437,11 @@ public class SendBtcConfirmWizardFragment extends SendWizardFragment implements
                 return false;
             }
         });
+        // set FLAG_SECURE to prevent screenshots in Release Mode
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+            passwordDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
         passwordDialog.show();
     }
 

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendConfirmWizardFragment.java

@@ -27,10 +27,12 @@ import android.view.KeyEvent;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.view.WindowManager;
 import android.view.inputmethod.EditorInfo;
 import android.widget.Button;
 import android.widget.TextView;
 
+import com.m2049r.xmrwallet.BuildConfig;
 import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.data.TxData;
 import com.m2049r.xmrwallet.model.PendingTransaction;
@@ -322,6 +324,11 @@ public class SendConfirmWizardFragment extends SendWizardFragment implements Sen
                 return false;
             }
         });
+        // set FLAG_SECURE to prevent screenshots in Release Mode
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+            passwordDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
         passwordDialog.show();
     }
 

app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java

@@ -30,6 +30,7 @@ import com.m2049r.xmrwallet.model.TransactionInfo;
 import com.m2049r.xmrwallet.util.Helper;
 import com.m2049r.xmrwallet.data.UserNotes;
 
+import java.math.BigDecimal;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Calendar;
@@ -154,7 +155,7 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
             }
 
             if ((infoItem.fee > 0)) {
-                String fee = Helper.getDisplayAmount(infoItem.fee, 5);
+                String fee = Helper.getDisplayAmount(infoItem.fee, Helper.DISPLAY_DIGITS_INFO);
                 tvFee.setText(context.getString(R.string.tx_list_fee, fee));
                 tvFee.setVisibility(View.VISIBLE);
             } else {

app/src/main/java/com/m2049r/xmrwallet/ledger/Ledger.java

@@ -34,6 +34,7 @@ import java.io.IOException;
 import timber.log.Timber;
 
 public class Ledger {
+    static final public boolean ENABLED = true;
     // 5:20 is same as wallet2.cpp::restore()
     static public final int LOOKAHEAD_ACCOUNTS = 5;
     static public final int LOOKAHEAD_SUBADDRESSES = 20;
@@ -44,6 +45,7 @@ public class Ledger {
     public static final int OK[] = {SW_OK};
 
     public static UsbDevice findDevice(UsbManager usbManager) {
+        if (!ENABLED) return null;
         return BTChipTransportAndroidHID.getDevice(usbManager);
     }
 

app/src/main/java/com/m2049r/xmrwallet/ledger/LedgerProgressDialog.java

@@ -6,7 +6,6 @@ import android.os.Looper;
 
 import com.m2049r.xmrwallet.R;
 import com.m2049r.xmrwallet.dialog.ProgressDialog;
-import com.m2049r.xmrwallet.model.WalletManager;
 
 import timber.log.Timber;
 

app/src/main/java/com/m2049r/xmrwallet/model/TransactionInfo.java

@@ -173,5 +173,4 @@ public class TransactionInfo implements Parcelable, Comparable<TransactionInfo>
             return this.hash.compareTo(another.hash);
         }
     }
-
-}
+}

app/src/main/java/com/m2049r/xmrwallet/model/Wallet.java

@@ -353,9 +353,10 @@ public class Wallet {
         if (label.equals(NEW_ACCOUNT_NAME)) {
             String address = getAddress(accountIndex);
             int len = address.length();
-            return address.substring(0, 6) +
+            label = address.substring(0, 6) +
                     "\u2026" + address.substring(len - 6, len);
-        } else return label;
+        }
+        return label;
     }
 
     public String getSubaddressLabel(int addressIndex) {

app/src/main/java/com/m2049r/xmrwallet/service/WalletService.java

@@ -69,10 +69,6 @@ public class WalletService extends Service {
     public static final String REQUEST_CMD_SEND = "send";
     public static final String REQUEST_CMD_SEND_NOTES = "notes";
 
-    public static final String REQUEST_CMD_SETNOTE = "setnote";
-    public static final String REQUEST_CMD_SETNOTE_TX = "tx";
-    public static final String REQUEST_CMD_SETNOTE_NOTES = "notes";
-
     public static final int START_SERVICE = 1;
     public static final int STOP_SERVICE = 2;
 
@@ -224,8 +220,6 @@ public class WalletService extends Service {
 
         void onSendTransactionFailed(String error);
 
-        void onSetNotes(boolean success);
-
         void onWalletStarted(Wallet.ConnectionStatus walletStatus);
 
         void onWalletOpen(Wallet.Device device);
@@ -378,26 +372,6 @@ public class WalletService extends Service {
                             if (observer != null) observer.onSendTransactionFailed(error);
                             return;
                         }
-                    } else if (cmd.equals(REQUEST_CMD_SETNOTE)) {
-                        Wallet myWallet = getWallet();
-                        Timber.d("SET NOTE for wallet: %s", myWallet.getName());
-                        String txId = extras.getString(REQUEST_CMD_SETNOTE_TX);
-                        String notes = extras.getString(REQUEST_CMD_SETNOTE_NOTES);
-                        if ((txId != null) && (notes != null)) {
-                            boolean success = myWallet.setUserNote(txId, notes);
-                            if (!success) {
-                                Timber.e(myWallet.getErrorString());
-                            }
-                            if (observer != null) observer.onSetNotes(success);
-                            if (success) {
-                                boolean rc = myWallet.store();
-                                Timber.d("wallet stored: %s with rc=%b", myWallet.getName(), rc);
-                                if (!rc) {
-                                    Timber.w("Wallet store failed: %s", myWallet.getErrorString());
-                                }
-                                if (observer != null) observer.onWalletStored(rc);
-                            }
-                        }
                     }
                 }
                 break;

app/src/main/java/com/m2049r/xmrwallet/util/Helper.java

@@ -64,6 +64,7 @@ import com.m2049r.xmrwallet.service.exchange.api.ExchangeApi;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStreamReader;
+import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.net.MalformedURLException;
 import java.net.SocketTimeoutException;
@@ -186,28 +187,23 @@ public class Helper {
         act.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
     }
 
+    static public BigDecimal getDecimalAmount(long amount) {
+        return new BigDecimal(amount).scaleByPowerOfTen(-12);
+    }
+
     static public String getDisplayAmount(long amount) {
         return getDisplayAmount(amount, 12);
     }
 
     static public String getDisplayAmount(long amount, int maxDecimals) {
-        return getDisplayAmount(Wallet.getDisplayAmount(amount), maxDecimals);
-    }
-
-    // amountString must have '.' as decimal point
-    private static String getDisplayAmount(String amountString, int maxDecimals) {
-        int lastZero = 0;
-        int decimal = 0;
-        for (int i = amountString.length() - 1; i >= 0; i--) {
-            if ((lastZero == 0) && (amountString.charAt(i) != '0')) lastZero = i + 1;
-            // TODO i18n
-            if (amountString.charAt(i) == '.') {
-                decimal = i + 1;
-                break;
-            }
-        }
-        int cutoff = Math.min(Math.max(lastZero, decimal + 2), decimal + maxDecimals);
-        return amountString.substring(0, cutoff);
+        // a Java bug does not strip zeros properly if the value is 0
+        if (amount == 0) return "0.00";
+        BigDecimal d = getDecimalAmount(amount)
+                .setScale(maxDecimals, BigDecimal.ROUND_HALF_UP)
+                .stripTrailingZeros();
+        if (d.scale() < 2)
+            d = d.setScale(2, BigDecimal.ROUND_UNNECESSARY);
+        return d.toPlainString();
     }
 
     static public String getFormattedAmount(double amount, boolean isXmr) {
@@ -556,6 +552,8 @@ public class Helper {
                     tvOpenPrompt.setText(context.getText(R.string.prompt_fingerprint_auth));
                     tvOpenPrompt.setVisibility(View.VISIBLE);
                     FingerprintHelper.authenticate(context, cancelSignal, fingerprintAuthCallback);
+                } else {
+                    etPassword.requestFocus();
                 }
                 Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
                 button.setOnClickListener(new View.OnClickListener() {
@@ -587,6 +585,11 @@ public class Helper {
             }
         });
 
+        // set FLAG_SECURE to prevent screenshots in Release Mode
+        if (!(BuildConfig.DEBUG && BuildConfig.FLAVOR_type.equals("alpha"))) {
+            openDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
         Helper.showKeyboard(openDialog);
         openDialog.show();
     }

app/src/main/java/com/m2049r/xmrwallet/util/RestoreHeight.java

@@ -100,6 +100,9 @@ public class RestoreHeight {
         blockheight.put("2018-12-01", 1716687L);
         blockheight.put("2019-01-01", 1738923L);
         blockheight.put("2019-02-01", 1761435L);
+        blockheight.put("2019-03-01", 1781681L);
+        blockheight.put("2019-04-01", 1803081L);
+        blockheight.put("2019-05-01", 1824671L);
     }
 
     public long getHeight(String date) {

app/src/main/java/com/m2049r/xmrwallet/util/ledger/ECsecp256k1.java

@@ -0,0 +1,81 @@
+/*
+ * Based on
+ * https://stackoverflow.com/a/19943894
+ *
+ * Curve parameters from
+ * https://en.bitcoin.it/wiki/Secp256k1
+ *
+ * Copyright (c) 2019 m2049r
+ * Copyright (c) 2013 ChiaraHsieh
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.util.ledger;
+
+import java.math.BigInteger;
+import java.security.spec.ECPoint;
+
+public class ECsecp256k1 {
+    static private final BigInteger TWO = new BigInteger("2");
+    static private final BigInteger THREE = new BigInteger("3");
+    static public final BigInteger p = new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F", 16);
+    static public final BigInteger a = new BigInteger("0000000000000000000000000000000000000000000000000000000000000000", 16);
+    static public final BigInteger b = new BigInteger("0000000000000000000000000000000000000000000000000000000000000007", 16);
+    static public final BigInteger n = new BigInteger("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16);
+    static public final ECPoint G = new ECPoint(
+            new BigInteger("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16),
+            new BigInteger("483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8", 16));
+
+    public static ECPoint scalmult(BigInteger kin, ECPoint P) {
+        ECPoint R = ECPoint.POINT_INFINITY, S = P;
+        BigInteger k = kin.mod(n); // not necessary b/c that's how curves work
+        int length = k.bitLength();
+        byte[] binarray = new byte[length];
+        for (int i = 0; i <= length - 1; i++) {
+            binarray[i] = k.mod(TWO).byteValue();
+            k = k.divide(TWO);
+        }
+        for (int i = length - 1; i >= 0; i--) {
+            // i should start at length-1 not -2 because the MSB of binary may not be 1
+            R = doublePoint(R);
+            if (binarray[i] == 1)
+                R = addPoint(R, S);
+        }
+        return R;
+    }
+
+    public static ECPoint addPoint(ECPoint r, ECPoint s) {
+        if (r.equals(s))
+            return doublePoint(r);
+        else if (r.equals(ECPoint.POINT_INFINITY))
+            return s;
+        else if (s.equals(ECPoint.POINT_INFINITY))
+            return r;
+        BigInteger slope = (r.getAffineY().subtract(s.getAffineY()))
+                .multiply(r.getAffineX().subtract(s.getAffineX()).modInverse(p));
+        BigInteger Xout = (slope.modPow(TWO, p).subtract(r.getAffineX())).subtract(s.getAffineX()).mod(p);
+        BigInteger Yout = s.getAffineY().negate().add(slope.multiply(s.getAffineX().subtract(Xout))).mod(p);
+        return new ECPoint(Xout, Yout);
+    }
+
+    public static ECPoint doublePoint(ECPoint r) {
+        if (r.equals(ECPoint.POINT_INFINITY))
+            return r;
+        BigInteger slope = (r.getAffineX().pow(2)).multiply(THREE).add(a)
+                .multiply((r.getAffineY().multiply(TWO)).modInverse(p));
+        BigInteger Xout = slope.pow(2).subtract(r.getAffineX().multiply(TWO)).mod(p);
+        BigInteger Yout = (r.getAffineY().negate()).add(slope.multiply(r.getAffineX().subtract(Xout))).mod(p);
+        return new ECPoint(Xout, Yout);
+    }
+}

app/src/main/java/com/theromus/sha/Keccak.java

@@ -0,0 +1,170 @@
+package com.theromus.sha;
+
+import static com.theromus.utils.HexUtils.leftRotate64;
+import static com.theromus.utils.HexUtils.convertToUint;
+import static com.theromus.utils.HexUtils.convertFromLittleEndianTo64;
+import static com.theromus.utils.HexUtils.convertFrom64ToLittleEndian;
+import static java.lang.Math.min;
+import static java.lang.System.arraycopy;
+import static java.util.Arrays.fill;
+
+import java.io.ByteArrayOutputStream;
+import java.math.BigInteger;
+
+
+/**
+ * Keccak implementation.
+ *
+ * @author romus
+ */
+public class Keccak {
+
+    private static BigInteger BIT_64 = new BigInteger("18446744073709551615");
+
+    /**
+     * Do hash.
+     *
+     * @param message input data
+     * @param parameter keccak param
+     * @return byte-array result
+     */
+    public byte[] getHash(final byte[] message, final Parameters parameter) {
+        int[] uState = new int[200];
+        int[] uMessage = convertToUint(message);
+
+
+        int rateInBytes = parameter.getRate() / 8;
+        int blockSize = 0;
+        int inputOffset = 0;
+
+        // Absorbing phase
+        while (inputOffset < uMessage.length) {
+            blockSize = min(uMessage.length - inputOffset, rateInBytes);
+            for (int i = 0; i < blockSize; i++) {
+                uState[i] = uState[i] ^ uMessage[i + inputOffset];
+            }
+
+            inputOffset = inputOffset + blockSize;
+            if (blockSize == rateInBytes) {
+                doKeccakf(uState);
+                blockSize = 0;
+            }
+        }
+
+        // Padding phase
+        uState[blockSize] = uState[blockSize] ^ parameter.getD();
+        if ((parameter.getD() & 0x80) != 0 && blockSize == (rateInBytes - 1)) {
+            doKeccakf(uState);
+        }
+
+        uState[rateInBytes - 1] = uState[rateInBytes - 1] ^ 0x80;
+        doKeccakf(uState);
+
+        // Squeezing phase
+        ByteArrayOutputStream byteResults = new ByteArrayOutputStream();
+        int tOutputLen = parameter.getOutputLen() / 8;
+        while (tOutputLen > 0) {
+            blockSize = min(tOutputLen, rateInBytes);
+            for (int i = 0; i < blockSize; i++) {
+                byteResults.write((byte) uState[i]);
+            }
+
+            tOutputLen -= blockSize;
+            if (tOutputLen > 0) {
+                doKeccakf(uState);
+            }
+        }
+
+        return byteResults.toByteArray();
+    }
+
+    private void doKeccakf(final int[] uState) {
+        BigInteger[][] lState = new BigInteger[5][5];
+
+        for (int i = 0; i < 5; i++) {
+            for (int j = 0; j < 5; j++) {
+                int[] data = new int[8];
+                arraycopy(uState, 8 * (i + 5 * j), data, 0, data.length);
+                lState[i][j] = convertFromLittleEndianTo64(data);
+            }
+        }
+        roundB(lState);
+
+        fill(uState, 0);
+        for (int i = 0; i < 5; i++) {
+            for (int j = 0; j < 5; j++) {
+                int[] data = convertFrom64ToLittleEndian(lState[i][j]);
+                arraycopy(data, 0, uState, 8 * (i + 5 * j), data.length);
+            }
+        }
+
+    }
+
+    /**
+     * Permutation on the given state.
+     *
+     * @param state state
+     */
+    private void roundB(final BigInteger[][] state) {
+        int LFSRstate = 1;
+        for (int round = 0; round < 24; round++) {
+            BigInteger[] C = new BigInteger[5];
+            BigInteger[] D = new BigInteger[5];
+
+            // θ step
+            for (int i = 0; i < 5; i++) {
+                C[i] = state[i][0].xor(state[i][1]).xor(state[i][2]).xor(state[i][3]).xor(state[i][4]);
+            }
+
+            for (int i = 0; i < 5; i++) {
+                D[i] = C[(i + 4) % 5].xor(leftRotate64(C[(i + 1) % 5], 1));
+            }
+
+            for (int i = 0; i < 5; i++) {
+                for (int j = 0; j < 5; j++) {
+                    state[i][j] = state[i][j].xor(D[i]);
+                }
+            }
+
+            //ρ and π steps
+            int x = 1, y = 0;
+            BigInteger current = state[x][y];
+            for (int i = 0; i < 24; i++) {
+                int tX = x;
+                x = y;
+                y = (2 * tX + 3 * y) % 5;
+
+                BigInteger shiftValue = current;
+                current = state[x][y];
+
+                state[x][y] = leftRotate64(shiftValue, (i + 1) * (i + 2) / 2);
+            }
+
+            //χ step
+            for (int j = 0; j < 5; j++) {
+                BigInteger[] t = new BigInteger[5];
+                for (int i = 0; i < 5; i++) {
+                    t[i] = state[i][j];
+                }
+
+                for (int i = 0; i < 5; i++) {
+                    // ~t[(i + 1) % 5]
+                    BigInteger invertVal = t[(i + 1) % 5].xor(BIT_64);
+                    // t[i] ^ ((~t[(i + 1) % 5]) & t[(i + 2) % 5])
+                    state[i][j] = t[i].xor(invertVal.and(t[(i + 2) % 5]));
+                }
+            }
+
+            //ι step
+            for (int i = 0; i < 7; i++) {
+                LFSRstate = ((LFSRstate << 1) ^ ((LFSRstate >> 7) * 0x71)) % 256;
+                // pow(2, i) - 1
+                int bitPosition = (1 << i) - 1;
+                if ((LFSRstate & 2) != 0) {
+                    state[0][0] = state[0][0].xor(new BigInteger("1").shiftLeft(bitPosition));
+                }
+            }
+        }
+    }
+
+}

app/src/main/java/com/theromus/sha/Parameters.java

@@ -0,0 +1,51 @@
+package com.theromus.sha;
+
+/**
+ * The parameters defining the standard FIPS 202.
+ *
+ * @author romus
+ */
+public enum Parameters {
+    KECCAK_224 (1152, 0x01, 224),
+    KECCAK_256 (1088, 0x01, 256),
+    KECCAK_384 (832, 0x01, 384),
+    KECCAK_512 (576, 0x01, 512),
+
+    SHA3_224 (1152, 0x06, 224),
+    SHA3_256 (1088, 0x06, 256),
+    SHA3_384 (832, 0x06, 384),
+    SHA3_512 (576, 0x06, 512),
+
+    SHAKE128 (1344, 0x1F, 256),
+    SHAKE256 (1088, 0x1F, 512);
+
+    private final int rate;
+
+    /**
+     * Delimited suffix.
+     */
+    public final int d;
+
+    /**
+     * Output length (bits).
+     */
+    public final int outputLen;
+
+    Parameters(int rate, int d, int outputLen) {
+        this.rate = rate;
+        this.d = d;
+        this.outputLen = outputLen;
+    }
+
+    public int getRate() {
+        return rate;
+    }
+
+    public int getD() {
+        return d;
+    }
+
+    public int getOutputLen() {
+        return outputLen;
+    }
+}

app/src/main/java/com/theromus/utils/HexUtils.java

@@ -0,0 +1,97 @@
+package com.theromus.utils;
+
+
+import java.io.ByteArrayOutputStream;
+import java.math.BigInteger;
+
+/**
+ * Hex-utils.
+ *
+ * @author romus
+ */
+public class HexUtils {
+
+    private static final byte[] ENCODE_BYTE_TABLE = {
+            (byte) '0', (byte) '1', (byte) '2', (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7',
+            (byte) '8', (byte) '9', (byte) 'a', (byte) 'b', (byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f'
+    };
+
+    /**
+     * Convert byte array to unsigned array.
+     *
+     * @param data byte array
+     * @return unsigned array
+     */
+    public static int[] convertToUint(final byte[] data) {
+        int[] converted = new int[data.length];
+        for (int i = 0; i < data.length; i++) {
+            converted[i] = data[i] & 0xFF;
+        }
+
+        return converted;
+    }
+
+    /**
+     * Convert LE to 64-bit value (unsigned long).
+     *
+     * @param data data
+     * @return 64-bit value (unsigned long)
+     */
+    public static BigInteger convertFromLittleEndianTo64(final int[] data) {
+        BigInteger uLong = new BigInteger("0");
+        for (int i = 0; i < 8; i++) {
+            uLong = uLong.add(new BigInteger(Integer.toString(data[i])).shiftLeft(8 * i));
+        }
+
+        return uLong;
+    }
+
+    /**
+     * Convert 64-bit (unsigned long) value to LE.
+     *
+     * @param uLong 64-bit value (unsigned long)
+     * @return LE
+     */
+    public static int[] convertFrom64ToLittleEndian(final BigInteger uLong) {
+        int[] data = new int[8];
+        BigInteger mod256 = new BigInteger("256");
+        for (int i = 0; i < 8; i++) {
+            data[i] = uLong.shiftRight((8 * i)).mod(mod256).intValue();
+        }
+
+        return data;
+    }
+
+    /**
+     * Bitwise rotate left.
+     *
+     * @param value  unsigned long value
+     * @param rotate rotate left
+     * @return result
+     */
+    public static BigInteger leftRotate64(final BigInteger value, final int rotate) {
+        BigInteger lp = value.shiftRight(64 - (rotate % 64));
+        BigInteger rp = value.shiftLeft(rotate % 64);
+
+        return lp.add(rp).mod(new BigInteger("18446744073709551616"));
+    }
+
+    /**
+     * Convert bytes to string.
+     *
+     * @param data bytes array
+     * @return string
+     */
+    public static String convertBytesToString(final byte[] data) {
+        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
+        for (int i = 0; i < data.length; i++) {
+            int uVal = data[i] & 0xFF;
+
+            buffer.write(ENCODE_BYTE_TABLE[(uVal >>> 4)]);
+            buffer.write(ENCODE_BYTE_TABLE[uVal & 0xF]);
+        }
+
+        return new String(buffer.toByteArray());
+    }
+
+}

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

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:layout_margin="8dp">
@@ -90,7 +89,7 @@
                 android:layout_height="wrap_content"
                 android:hint="@string/generate_mnemonic_hint"
                 android:imeOptions="actionNext"
-                android:inputType="textMultiLine"
+                android:inputType="textMultiLine|textVisiblePassword"
                 android:textAlignment="textStart" />
         </android.support.design.widget.TextInputLayout>
 

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

@@ -37,8 +37,7 @@
                 android:layout_height="wrap_content"
                 android:layout_alignParentTop="true"
                 android:layout_marginStart="16dp"
-                android:layout_toStartOf="@+id/ibOption"
-                android:layout_toEndOf="@id/ibBookmark">
+                android:layout_toStartOf="@+id/ibOption">
 
                 <ProgressBar
                     android:id="@+id/pbNode"
@@ -79,9 +78,9 @@
                 android:layout_height="wrap_content"
                 android:layout_alignParentEnd="true"
                 android:layout_centerInParent="true"
-                android:padding="12dp"
                 android:background="?android:attr/selectableItemBackgroundBorderless"
                 android:gravity="center"
+                android:padding="12dp"
                 android:src="@drawable/ic_search_orange_24dp" />
         </RelativeLayout>
 
@@ -104,18 +103,13 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent">
 
-            <ScrollView
-                android:layout_width="match_parent"
+            <ImageView
+                android:id="@+id/ivGunther"
+                android:layout_width="wrap_content"
                 android:layout_height="match_parent"
-                android:fillViewport="true">
-
-                <ImageView
-                    android:id="@+id/ivGunther"
-                    android:layout_width="match_parent"
-                    android:layout_height="match_parent"
-                    android:adjustViewBounds="true"
-                    android:padding="48dp" />
-            </ScrollView>
+                android:adjustViewBounds="true"
+                android:layout_gravity="center"
+                android:padding="48dp" />
 
             <android.support.v7.widget.RecyclerView xmlns:tools="http://schemas.android.com/tools"
                 android:id="@+id/list"