convert ledger seed dialog (#549)

app/build.gradle

@@ -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/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;
@@ -240,9 +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)) {
@@ -274,9 +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)) {
@@ -303,9 +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());
@@ -616,4 +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);
         }

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/dialog/ProgressDialog.java

@@ -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);

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/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 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)).mod(p);
+        BigInteger Xout = (slope.modPow(TWO, p).subtract(r.getAffineX())).subtract(s.getAffineX()).mod(p);
+        BigInteger Yout = s.getAffineY().negate().mod(p);
+        Yout = Yout.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(new BigInteger("3"));
+        slope = slope.add(a);
+        slope = slope.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/prompt_ledger_seed.xml

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="8dp">
+
+    <TextView
+        style="@style/MoneroLabel"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:labelFor="@+id/etSeed"
+        android:text="@string/menu_ledger_seed"
+        android:textAppearance="?android:attr/textAppearanceLarge" />
+
+    <TextView
+        style="@style/MoneroLabel"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="16dp"
+        android:textColor="@color/colorAccent"
+        android:labelFor="@+id/etSeed"
+        android:text="@string/prompt_ledger_seed_warn" />
+
+    <android.support.design.widget.TextInputLayout
+        android:id="@+id/etSeed"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:errorEnabled="true">
+
+        <android.support.design.widget.TextInputEditText
+            style="@style/MoneroEdit"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/prompt_ledger_seed"
+            android:imeOptions="normal"
+            android:inputType="textMultiLine|textVisiblePassword" />
+
+    </android.support.design.widget.TextInputLayout>
+
+    <android.support.design.widget.TextInputLayout
+        android:id="@+id/etPassphrase"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:errorEnabled="true">
+
+        <android.support.design.widget.TextInputEditText
+            style="@style/MoneroEdit"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:hint="@string/prompt_ledger_phrase"
+            android:imeOptions="normal"
+            android:inputType="textVisiblePassword" />
+
+    </android.support.design.widget.TextInputLayout>
+
+    <TextView
+        android:id="@+id/tvOpenPrompt"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:drawablePadding="10dp"
+        android:gravity="center_vertical"
+        android:visibility="gone" />
+</LinearLayout>

app/src/main/res/menu/create_wallet_seed.xml

@@ -7,6 +7,13 @@
         android:icon="@drawable/ic_help_white_24dp"
         android:orderInCategory="100"
         android:title="@string/menu_help"
-        app:showAsAction="always" />
+        app:showAsAction="ifRoom" />
+
+    <item
+        android:id="@+id/action_ledger_seed"
+        android:icon="@drawable/ic_ledger_restore"
+        android:orderInCategory="200"
+        android:title="@string/menu_ledger_seed"
+        app:showAsAction="never" />
 
 </menu>

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

@@ -376,4 +376,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -375,4 +375,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -375,4 +375,10 @@
     <string name="xmrto_error_012">Tro da mendoj</string>
 
     <string name="street_sweep_amount">ĈIO!</string>
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -365,4 +365,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -373,4 +373,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -379,4 +379,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -377,4 +377,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -378,4 +378,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -421,4 +421,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -375,4 +375,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -375,4 +375,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

app/src/main/res/values-pt-rBR/strings.xml

@@ -367,4 +367,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -379,4 +379,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -375,4 +375,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -379,4 +379,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -377,4 +377,9 @@
 
     <string name="street_sweep_amount">VŠETKO!</string> <!-- as in: "everything in the account" = "all the money" -->
 
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -360,4 +360,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -379,4 +379,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

app/src/main/res/values-zh-rCN/strings.xml

@@ -373,4 +373,10 @@
     <string name="xmrto_error_012">Too many requests</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string> <!-- as in: "everything in the account" = "all the money" -->
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

app/src/main/res/values-zh-rTW/strings.xml

@@ -374,4 +374,10 @@
     <string name="xmrto_error_012">請求過於頻繁</string>
 
     <string name="street_sweep_amount">全部！</string>
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (optional)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

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

@@ -424,4 +424,10 @@
     <string name="xmrto_error" translatable="false">XMR.TO Service Error</string>
 
     <string name="street_sweep_amount">EVERYTHING!</string>
+
+    <string name="menu_ledger_seed">Convert Ledger Seed</string>
+    <string name="prompt_ledger_seed">Ledger Seed Words</string>
+    <string name="prompt_ledger_phrase">Ledger Passphrase (advanced)</string>
+    <string name="bad_ledger_seed">Invalid Ledger Seed!</string>
+    <string name="prompt_ledger_seed_warn">Entering you Ledger Seed here is a major security risk!</string>
 </resources>

app/src/test/java/com/m2049r/xmrwallet/util/ledger/MoneroTest.java

@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2019 m2049r
+ *
+ * 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 org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+public class MoneroTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    @Test
+    public void aRealTest() {
+        String ledgerMnemonic = "weird cloth shiver soda music slight system slender daughter magic design story gospel bulk teach between spice kangaroo inside satoshi convince load morning income";
+        String ledgerPassphrase = "";
+        String monero_mnemonic = "maverick aimless laptop eating vibrate sensible bugs dreams " +
+                "journal sincerely renting obtains boss mullet rustled cuddled " +
+                "goblet nightly jailed hamburger getting benches haggled hesitate laptop";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertTrue(monero_mnemonic.equals(test_monero));
+    }
+
+    @Test
+    public void bRealTest() {
+        String ledgerMnemonic = "weird cloth shiver soda music slight system slender daughter magic design story gospel bulk teach between spice kangaroo inside satoshi convince load morning income";
+        String ledgerPassphrase = "secret";
+        String monero_mnemonic = "surfer hemlock afraid huddle mostly yanks revamp pairing " +
+                "northern yodel obliged vials azure huddle mowing melting " +
+                "ruthless subtly civilian midst playful vats nabbing nowhere mowing";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertTrue(monero_mnemonic.equals(test_monero));
+    }
+
+    @Test
+    public void aTest() {
+        String ledgerMnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
+        String ledgerPassphrase = "";
+        String monero_mnemonic = "tavern judge beyond bifocals deepest mural onward dummy " +
+                "eagle diode gained vacation rally cause firm idled " +
+                "jerseys moat vigilant upload bobsled jobs cunning doing jobs";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertTrue(monero_mnemonic.equals(test_monero));
+    }
+
+    @Test
+    public void bTest() {
+        String ledgerMnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
+        String ledgerPassphrase = "xyz";
+        String monero_mnemonic = "gambit observant swiftly metro hoax pheasants agile oozed " +
+                "fibula nuns picked stellar nibs cause gained phase " +
+                "lettuce tomorrow pierce awakened pistons pheasants sorry tedious gambit";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertTrue(monero_mnemonic.equals(test_monero));
+    }
+
+    @Test
+    public void whitespaceTest() {
+        String ledgerMnemonic = "   abandon  abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
+        String ledgerPassphrase = "xyz";
+        String monero_mnemonic = "gambit observant swiftly metro hoax pheasants agile oozed " +
+                "fibula nuns picked stellar nibs cause gained phase " +
+                "lettuce tomorrow pierce awakened pistons pheasants sorry tedious gambit";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertTrue(monero_mnemonic.equals(test_monero));
+    }
+
+    @Test
+    public void caseTest() {
+        String ledgerMnemonic = "Abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
+        String ledgerPassphrase = "xyz";
+        String monero_mnemonic = "gambit observant swiftly metro hoax pheasants agile oozed " +
+                "fibula nuns picked stellar nibs cause gained phase " +
+                "lettuce tomorrow pierce awakened pistons pheasants sorry tedious gambit";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertTrue(monero_mnemonic.equals(test_monero));
+    }
+
+    @Test
+    public void nullTest() {
+        String ledgerMnemonic = "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about";
+        String ledgerPassphrase = "xyz";
+        String test_monero = Monero.convert(ledgerMnemonic, ledgerPassphrase);
+        assertNull(test_monero);
+    }
+}

build.gradle

@@ -16,6 +16,9 @@ allprojects {
         maven {
             url "https://maven.google.com"
         }
+        maven {
+            url "https://repository.mulesoft.org/nexus/content/repositories/public/"
+        }
         google()
     }
 }