+++ /dev/null
-/*
- * Copyright 2018-2022 Soren Stoutner <soren@stoutner.com>.
- *
- * This file is part of Privacy Browser Android <https://www.stoutner.com/privacy-browser-android>.
- *
- * Privacy Browser Android is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Privacy Browser Android is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Privacy Browser Android. If not, see <http://www.gnu.org/licenses/>.
- */
-
-package com.stoutner.privacybrowser.activities;
-
-import android.app.Activity;
-import android.content.Intent;
-import android.content.SharedPreferences;
-import android.content.pm.PackageManager;
-import android.net.Uri;
-import android.os.Bundle;
-import android.os.Handler;
-import android.text.Editable;
-import android.text.TextWatcher;
-import android.view.View;
-import android.view.WindowManager;
-import android.widget.AdapterView;
-import android.widget.ArrayAdapter;
-import android.widget.Button;
-import android.widget.EditText;
-import android.widget.LinearLayout;
-import android.widget.RadioButton;
-import android.widget.Spinner;
-import android.widget.TextView;
-
-import androidx.annotation.NonNull;
-import androidx.appcompat.app.ActionBar;
-import androidx.appcompat.app.AppCompatActivity;
-import androidx.appcompat.widget.Toolbar;
-import androidx.cardview.widget.CardView;
-import androidx.core.content.FileProvider;
-import androidx.preference.PreferenceManager;
-
-import com.google.android.material.snackbar.Snackbar;
-import com.google.android.material.textfield.TextInputLayout;
-
-import com.stoutner.privacybrowser.BuildConfig;
-import com.stoutner.privacybrowser.R;
-import com.stoutner.privacybrowser.helpers.ImportExportDatabaseHelper;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.nio.charset.StandardCharsets;
-import java.security.MessageDigest;
-import java.security.SecureRandom;
-import java.util.Arrays;
-
-import javax.crypto.Cipher;
-import javax.crypto.CipherInputStream;
-import javax.crypto.CipherOutputStream;
-import javax.crypto.spec.GCMParameterSpec;
-import javax.crypto.spec.SecretKeySpec;
-
-public class ImportExportActivity extends AppCompatActivity {
- // Define the encryption constants.
- private final int NO_ENCRYPTION = 0;
- private final int PASSWORD_ENCRYPTION = 1;
- private final int OPENPGP_ENCRYPTION = 2;
-
- // Define the activity result constants.
- private final int BROWSE_RESULT_CODE = 0;
- private final int OPENPGP_IMPORT_RESULT_CODE = 1;
- private final int OPENPGP_EXPORT_RESULT_CODE = 2;
-
- // Define the saved instance state constants.
- private final String ENCRYPTION_PASSWORD_TEXTINPUTLAYOUT_VISIBILITY = "encryption_password_textinputlayout_visibility";
- private final String OPEN_KEYCHAIN_REQUIRED_TEXTVIEW_VISIBILITY = "open_keychain_required_textview_visibility";
- private final String FILE_LOCATION_CARD_VIEW = "file_location_card_view";
- private final String FILE_NAME_LINEARLAYOUT_VISIBILITY = "file_name_linearlayout_visibility";
- private final String OPEN_KEYCHAIN_IMPORT_INSTRUCTIONS_TEXTVIEW_VISIBILITY = "open_keychain_import_instructions_textview_visibility";
- private final String IMPORT_EXPORT_BUTTON_VISIBILITY = "import_export_button_visibility";
- private final String FILE_NAME_TEXT = "file_name_text";
- private final String IMPORT_EXPORT_BUTTON_TEXT = "import_export_button_text";
-
- // Define the class views.
- Spinner encryptionSpinner;
- TextInputLayout encryptionPasswordTextInputLayout;
- EditText encryptionPasswordEditText;
- TextView openKeychainRequiredTextView;
- CardView fileLocationCardView;
- RadioButton importRadioButton;
- LinearLayout fileNameLinearLayout;
- EditText fileNameEditText;
- TextView openKeychainImportInstructionsTextView;
- Button importExportButton;
-
- // Define the class variables.
- private File fileProviderDirectory;
- private boolean openKeychainInstalled;
- private File temporaryPgpEncryptedImportFile;
- private File temporaryPreEncryptedExportFile;
-
- @Override
- public void onCreate(Bundle savedInstanceState) {
- // Get a handle for the shared preferences.
- SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
-
- // Get the preferences.
- boolean allowScreenshots = sharedPreferences.getBoolean(getString(R.string.allow_screenshots_key), false);
- boolean bottomAppBar = sharedPreferences.getBoolean(getString(R.string.bottom_app_bar_key), false);
-
- // Disable screenshots if not allowed.
- if (!allowScreenshots) {
- getWindow().addFlags(WindowManager.LayoutParams.FLAG_SECURE);
- }
-
- // Run the default commands.
- super.onCreate(savedInstanceState);
-
- // Set the content view.
- if (bottomAppBar) {
- setContentView(R.layout.import_export_bottom_appbar);
- } else {
- setContentView(R.layout.import_export_top_appbar);
- }
-
- // Get a handle for the toolbar.
- Toolbar toolbar = findViewById(R.id.import_export_toolbar);
-
- // Set the support action bar.
- setSupportActionBar(toolbar);
-
- // Get a handle for the action bar.
- ActionBar actionBar = getSupportActionBar();
-
- // Remove the incorrect lint warning that the action bar might be null.
- assert actionBar != null;
-
- // Display the home arrow on the support action bar.
- actionBar.setDisplayHomeAsUpEnabled(true);
-
- // Find out if OpenKeychain is installed.
- try {
- openKeychainInstalled = !getPackageManager().getPackageInfo("org.sufficientlysecure.keychain", 0).versionName.isEmpty();
- } catch (PackageManager.NameNotFoundException exception) {
- openKeychainInstalled = false;
- }
-
- // Get handles for the views that need to be modified.
- encryptionSpinner = findViewById(R.id.encryption_spinner);
- encryptionPasswordTextInputLayout = findViewById(R.id.encryption_password_textinputlayout);
- encryptionPasswordEditText = findViewById(R.id.encryption_password_edittext);
- openKeychainRequiredTextView = findViewById(R.id.openkeychain_required_textview);
- fileLocationCardView = findViewById(R.id.file_location_cardview);
- importRadioButton = findViewById(R.id.import_radiobutton);
- RadioButton exportRadioButton = findViewById(R.id.export_radiobutton);
- fileNameLinearLayout = findViewById(R.id.file_name_linearlayout);
- fileNameEditText = findViewById(R.id.file_name_edittext);
- openKeychainImportInstructionsTextView = findViewById(R.id.openkeychain_import_instructions_textview);
- importExportButton = findViewById(R.id.import_export_button);
-
- // Create an array adapter for the spinner.
- ArrayAdapter<CharSequence> encryptionArrayAdapter = ArrayAdapter.createFromResource(this, R.array.encryption_type, R.layout.spinner_item);
-
- // Set the drop down view resource on the spinner.
- encryptionArrayAdapter.setDropDownViewResource(R.layout.spinner_dropdown_items);
-
- // Set the array adapter for the spinner.
- encryptionSpinner.setAdapter(encryptionArrayAdapter);
-
- // Update the UI when the spinner changes.
- encryptionSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
- @Override
- public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
- switch (position) {
- case NO_ENCRYPTION:
- // Hide the unneeded layout items.
- encryptionPasswordTextInputLayout.setVisibility(View.GONE);
- openKeychainRequiredTextView.setVisibility(View.GONE);
- openKeychainImportInstructionsTextView.setVisibility(View.GONE);
-
- // Show the file location card.
- fileLocationCardView.setVisibility(View.VISIBLE);
-
- // Show the file name linear layout if either import or export is checked.
- if (importRadioButton.isChecked() || exportRadioButton.isChecked()) {
- fileNameLinearLayout.setVisibility(View.VISIBLE);
- }
-
- // Reset the text of the import button, which may have been changed to `Decrypt`.
- if (importRadioButton.isChecked()) {
- importExportButton.setText(R.string.import_button);
- }
-
- // Enable the import/export button if the file name is populated.
- importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty());
- break;
-
- case PASSWORD_ENCRYPTION:
- // Hide the OpenPGP layout items.
- openKeychainRequiredTextView.setVisibility(View.GONE);
- openKeychainImportInstructionsTextView.setVisibility(View.GONE);
-
- // Show the password encryption layout items.
- encryptionPasswordTextInputLayout.setVisibility(View.VISIBLE);
-
- // Show the file location card.
- fileLocationCardView.setVisibility(View.VISIBLE);
-
- // Show the file name linear layout if either import or export is checked.
- if (importRadioButton.isChecked() || exportRadioButton.isChecked()) {
- fileNameLinearLayout.setVisibility(View.VISIBLE);
- }
-
- // Reset the text of the import button, which may have been changed to `Decrypt`.
- if (importRadioButton.isChecked()) {
- importExportButton.setText(R.string.import_button);
- }
-
- // Enable the import/button if both the password and the file name are populated.
- importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
- break;
-
- case OPENPGP_ENCRYPTION:
- // Hide the password encryption layout items.
- encryptionPasswordTextInputLayout.setVisibility(View.GONE);
-
- // Updated items based on the installation status of OpenKeychain.
- if (openKeychainInstalled) { // OpenKeychain is installed.
- // Show the file location card.
- fileLocationCardView.setVisibility(View.VISIBLE);
-
- if (importRadioButton.isChecked()) {
- // Show the file name linear layout and the OpenKeychain import instructions.
- fileNameLinearLayout.setVisibility(View.VISIBLE);
- openKeychainImportInstructionsTextView.setVisibility(View.VISIBLE);
-
- // Set the text of the import button to be `Decrypt`.
- importExportButton.setText(R.string.decrypt);
-
- // Enable the import button if the file name is populated.
- importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty());
- } else if (exportRadioButton.isChecked()) {
- // Hide the file name linear layout and the OpenKeychain import instructions.
- fileNameLinearLayout.setVisibility(View.GONE);
- openKeychainImportInstructionsTextView.setVisibility(View.GONE);
-
- // Enable the export button.
- importExportButton.setEnabled(true);
- }
- } else { // OpenKeychain is not installed.
- // Show the OpenPGP required layout item.
- openKeychainRequiredTextView.setVisibility(View.VISIBLE);
-
- // Hide the file location card.
- fileLocationCardView.setVisibility(View.GONE);
- }
- break;
- }
- }
-
- @Override
- public void onNothingSelected(AdapterView<?> parent) {
-
- }
- });
-
- // Update the status of the import/export button when the password changes.
- encryptionPasswordEditText.addTextChangedListener(new TextWatcher() {
- @Override
- public void beforeTextChanged(CharSequence s, int start, int count, int after) {
- // Do nothing.
- }
-
- @Override
- public void onTextChanged(CharSequence s, int start, int before, int count) {
- // Do nothing.
- }
-
- @Override
- public void afterTextChanged(Editable s) {
- // Enable the import/export button if both the file string and the password are populated.
- importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
- }
- });
-
- // Update the UI when the file name EditText changes.
- fileNameEditText.addTextChangedListener(new TextWatcher() {
- @Override
- public void beforeTextChanged(CharSequence s, int start, int count, int after) {
- // Do nothing.
- }
-
- @Override
- public void onTextChanged(CharSequence s, int start, int before, int count) {
- // Do nothing.
- }
-
- @Override
- public void afterTextChanged(Editable s) {
- // Adjust the UI according to the encryption spinner position.
- if (encryptionSpinner.getSelectedItemPosition() == PASSWORD_ENCRYPTION) {
- // Enable the import/export button if both the file name and the password are populated.
- importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
- } else {
- // Enable the export button if the file name is populated.
- importExportButton.setEnabled(!fileNameEditText.getText().toString().isEmpty());
- }
- }
- });
-
- // Check to see if the activity has been restarted.
- if (savedInstanceState == null) { // The app has not been restarted.
- // Initially hide the unneeded views.
- encryptionPasswordTextInputLayout.setVisibility(View.GONE);
- openKeychainRequiredTextView.setVisibility(View.GONE);
- fileNameLinearLayout.setVisibility(View.GONE);
- openKeychainImportInstructionsTextView.setVisibility(View.GONE);
- importExportButton.setVisibility(View.GONE);
- } else { // The app has been restarted.
- // Restore the visibility of the views.
- encryptionPasswordTextInputLayout.setVisibility(savedInstanceState.getInt(ENCRYPTION_PASSWORD_TEXTINPUTLAYOUT_VISIBILITY));
- openKeychainRequiredTextView.setVisibility(savedInstanceState.getInt(OPEN_KEYCHAIN_REQUIRED_TEXTVIEW_VISIBILITY));
- fileLocationCardView.setVisibility(savedInstanceState.getInt(FILE_LOCATION_CARD_VIEW));
- fileNameLinearLayout.setVisibility(savedInstanceState.getInt(FILE_NAME_LINEARLAYOUT_VISIBILITY));
- openKeychainImportInstructionsTextView.setVisibility(savedInstanceState.getInt(OPEN_KEYCHAIN_IMPORT_INSTRUCTIONS_TEXTVIEW_VISIBILITY));
- importExportButton.setVisibility(savedInstanceState.getInt(IMPORT_EXPORT_BUTTON_VISIBILITY));
-
- // Restore the text.
- fileNameEditText.post(() -> fileNameEditText.setText(savedInstanceState.getString(FILE_NAME_TEXT)));
- importExportButton.setText(savedInstanceState.getString(IMPORT_EXPORT_BUTTON_TEXT));
- }
- }
-
- @Override
- public void onSaveInstanceState (@NonNull Bundle savedInstanceState) {
- // Run the default commands.
- super.onSaveInstanceState(savedInstanceState);
-
- // Save the visibility of the views.
- savedInstanceState.putInt(ENCRYPTION_PASSWORD_TEXTINPUTLAYOUT_VISIBILITY, encryptionPasswordTextInputLayout.getVisibility());
- savedInstanceState.putInt(OPEN_KEYCHAIN_REQUIRED_TEXTVIEW_VISIBILITY, openKeychainRequiredTextView.getVisibility());
- savedInstanceState.putInt(FILE_LOCATION_CARD_VIEW, fileLocationCardView.getVisibility());
- savedInstanceState.putInt(FILE_NAME_LINEARLAYOUT_VISIBILITY, fileNameLinearLayout.getVisibility());
- savedInstanceState.putInt(OPEN_KEYCHAIN_IMPORT_INSTRUCTIONS_TEXTVIEW_VISIBILITY, openKeychainImportInstructionsTextView.getVisibility());
- savedInstanceState.putInt(IMPORT_EXPORT_BUTTON_VISIBILITY, importExportButton.getVisibility());
-
- // Save the text.
- savedInstanceState.putString(FILE_NAME_TEXT, fileNameEditText.getText().toString());
- savedInstanceState.putString(IMPORT_EXPORT_BUTTON_TEXT, importExportButton.getText().toString());
- }
-
- public void onClickRadioButton(View view) {
- // Get the current file name.
- String fileNameString = fileNameEditText.getText().toString();
-
- // Convert the file name string to a file.
- File file = new File(fileNameString);
-
- // Check to see if import or export was selected.
- if (view.getId() == R.id.import_radiobutton) { // The import radio button is selected.
- // Check to see if OpenPGP encryption is selected.
- if (encryptionSpinner.getSelectedItemPosition() == OPENPGP_ENCRYPTION) { // OpenPGP encryption selected.
- // Show the OpenKeychain import instructions.
- openKeychainImportInstructionsTextView.setVisibility(View.VISIBLE);
-
- // Set the text on the import/export button to be `Decrypt`.
- importExportButton.setText(R.string.decrypt);
- } else { // OpenPGP encryption not selected.
- // Hide the OpenKeychain import instructions.
- openKeychainImportInstructionsTextView.setVisibility(View.GONE);
-
- // Set the text on the import/export button to be `Import`.
- importExportButton.setText(R.string.import_button);
- }
-
- // Display the file name views.
- fileNameLinearLayout.setVisibility(View.VISIBLE);
- importExportButton.setVisibility(View.VISIBLE);
-
- // Check to see if the file exists.
- if (file.exists()) { // The file exists.
- // Check to see if password encryption is selected.
- if (encryptionSpinner.getSelectedItemPosition() == PASSWORD_ENCRYPTION) { // Password encryption is selected.
- // Enable the import button if the encryption password is populated.
- importExportButton.setEnabled(!encryptionPasswordEditText.getText().toString().isEmpty());
- } else { // Password encryption is not selected.
- // Enable the import/decrypt button.
- importExportButton.setEnabled(true);
- }
- } else { // The file does not exist.
- // Disable the import/decrypt button.
- importExportButton.setEnabled(false);
- }
- } else { // The export radio button is selected.
- // Hide the OpenKeychain import instructions.
- openKeychainImportInstructionsTextView.setVisibility(View.GONE);
-
- // Set the text on the import/export button to be `Export`.
- importExportButton.setText(R.string.export);
-
- // Show the import/export button.
- importExportButton.setVisibility(View.VISIBLE);
-
- // Check to see if OpenPGP encryption is selected.
- if (encryptionSpinner.getSelectedItemPosition() == OPENPGP_ENCRYPTION) { // OpenPGP encryption is selected.
- // Hide the file name views.
- fileNameLinearLayout.setVisibility(View.GONE);
-
- // Enable the export button.
- importExportButton.setEnabled(true);
- } else { // OpenPGP encryption is not selected.
- // Show the file name view.
- fileNameLinearLayout.setVisibility(View.VISIBLE);
-
- // Check the encryption type.
- if (encryptionSpinner.getSelectedItemPosition() == NO_ENCRYPTION) { // No encryption is selected.
- // Enable the export button if the file name is populated.
- importExportButton.setEnabled(!fileNameString.isEmpty());
- } else { // Password encryption is selected.
- // Enable the export button if the file name and the password are populated.
- importExportButton.setEnabled(!fileNameString.isEmpty() && !encryptionPasswordEditText.getText().toString().isEmpty());
- }
- }
- }
- }
-
- public void browse(View view) {
- // Check to see if import or export is selected.
- if (importRadioButton.isChecked()) { // Import is selected.
- // Create the file picker intent.
- Intent importBrowseIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
-
- // Set the intent MIME type to include all files so that everything is visible.
- importBrowseIntent.setType("*/*");
-
- // Request a file that can be opened.
- importBrowseIntent.addCategory(Intent.CATEGORY_OPENABLE);
-
- // Launch the file picker.
- startActivityForResult(importBrowseIntent, BROWSE_RESULT_CODE);
- } else { // Export is selected
- // Create the file picker intent.
- Intent exportBrowseIntent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
-
- // Set the intent MIME type to include all files so that everything is visible.
- exportBrowseIntent.setType("*/*");
-
- // Set the initial export file name according to the encryption type.
- if (encryptionSpinner.getSelectedItemPosition() == NO_ENCRYPTION) { // No encryption is selected.
- exportBrowseIntent.putExtra(Intent.EXTRA_TITLE, getString(R.string.settings) + " " + BuildConfig.VERSION_NAME + ".pbs");
- } else { // Password encryption is selected.
- exportBrowseIntent.putExtra(Intent.EXTRA_TITLE, getString(R.string.settings) + " " + BuildConfig.VERSION_NAME + ".pbs.aes");
- }
-
- // Request a file that can be opened.
- exportBrowseIntent.addCategory(Intent.CATEGORY_OPENABLE);
-
- // Launch the file picker.
- startActivityForResult(exportBrowseIntent, BROWSE_RESULT_CODE);
- }
- }
-
- @Override
- public void onActivityResult(int requestCode, int resultCode, Intent returnedIntent) {
- // Run the default commands.
- super.onActivityResult(requestCode, resultCode, returnedIntent);
-
- switch (requestCode) {
- case (BROWSE_RESULT_CODE):
- // Only do something if the user didn't press back from the file picker.
- if (resultCode == Activity.RESULT_OK) {
- // Get the file path URI from the intent.
- Uri fileNameUri = returnedIntent.getData();
-
- // Get the file name string from the URI.
- String fileNameString = fileNameUri.toString();
-
- // Set the file name name text.
- fileNameEditText.setText(fileNameString);
-
- // Move the cursor to the end of the file name edit text.
- fileNameEditText.setSelection(fileNameString.length());
- }
- break;
-
- case OPENPGP_IMPORT_RESULT_CODE:
- // Delete the temporary PGP encrypted import file.
- if (temporaryPgpEncryptedImportFile.exists()) {
- //noinspection ResultOfMethodCallIgnored
- temporaryPgpEncryptedImportFile.delete();
- }
-
- // Delete the file provider directory if it exists.
- if (fileProviderDirectory.exists()) {
- //noinspection ResultOfMethodCallIgnored
- fileProviderDirectory.delete();
- }
-
- break;
-
- case OPENPGP_EXPORT_RESULT_CODE:
- // Delete the temporary pre-encrypted export file if it exists.
- if (temporaryPreEncryptedExportFile.exists()) {
- //noinspection ResultOfMethodCallIgnored
- temporaryPreEncryptedExportFile.delete();
- }
-
- // Delete the file provider directory if it exists.
- if (fileProviderDirectory.exists()) {
- //noinspection ResultOfMethodCallIgnored
- fileProviderDirectory.delete();
- }
-
- break;
- }
- }
-
- public void importExport(View view) {
- // Instantiate the import export database helper.
- ImportExportDatabaseHelper importExportDatabaseHelper = new ImportExportDatabaseHelper();
-
- // Check to see if import or export is selected.
- if (importRadioButton.isChecked()) { // Import is selected.
- // Initialize the import status string
- String importStatus = "";
-
- // Get the file name string.
- String fileNameString = fileNameEditText.getText().toString();
-
- // Import according to the encryption type.
- switch (encryptionSpinner.getSelectedItemPosition()) {
- case NO_ENCRYPTION:
- try {
- // Get an input stream for the file name.
- // A file may be opened directly once the minimum API >= 29. <https://developer.android.com/reference/kotlin/android/content/ContentResolver#openfile>
- InputStream inputStream = getContentResolver().openInputStream(Uri.parse(fileNameString));
-
- // Import the unencrypted file.
- importStatus = importExportDatabaseHelper.importUnencrypted(inputStream, this);
- } catch (FileNotFoundException exception) {
- // Update the import status.
- importStatus = exception.toString();
- }
-
- // Restart Privacy Browser if successful.
- if (importStatus.equals(ImportExportDatabaseHelper.IMPORT_SUCCESSFUL)) {
- restartPrivacyBrowser();
- }
- break;
-
- case PASSWORD_ENCRYPTION:
- try {
- // Get the encryption password.
- String encryptionPasswordString = encryptionPasswordEditText.getText().toString();
-
- // Get an input stream for the file name.
- InputStream inputStream = getContentResolver().openInputStream(Uri.parse(fileNameString));
-
- // Get the salt from the beginning of the import file.
- byte[] saltByteArray = new byte[32];
- //noinspection ResultOfMethodCallIgnored
- inputStream.read(saltByteArray);
-
- // Get the initialization vector from the import file.
- byte[] initializationVector = new byte[12];
- //noinspection ResultOfMethodCallIgnored
- inputStream.read(initializationVector);
-
- // Convert the encryption password to a byte array.
- byte[] encryptionPasswordByteArray = encryptionPasswordString.getBytes(StandardCharsets.UTF_8);
-
- // Append the salt to the encryption password byte array. This protects against rainbow table attacks.
- byte[] encryptionPasswordWithSaltByteArray = new byte[encryptionPasswordByteArray.length + saltByteArray.length];
- System.arraycopy(encryptionPasswordByteArray, 0, encryptionPasswordWithSaltByteArray, 0, encryptionPasswordByteArray.length);
- System.arraycopy(saltByteArray, 0, encryptionPasswordWithSaltByteArray, encryptionPasswordByteArray.length, saltByteArray.length);
-
- // Get a SHA-512 message digest.
- MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
-
- // Hash the salted encryption password. Otherwise, any characters after the 32nd character in the password are ignored.
- byte[] hashedEncryptionPasswordWithSaltByteArray = messageDigest.digest(encryptionPasswordWithSaltByteArray);
-
- // Truncate the encryption password byte array to 256 bits (32 bytes).
- byte[] truncatedHashedEncryptionPasswordWithSaltByteArray = Arrays.copyOf(hashedEncryptionPasswordWithSaltByteArray, 32);
-
- // Create an AES secret key from the encryption password byte array.
- SecretKeySpec secretKey = new SecretKeySpec(truncatedHashedEncryptionPasswordWithSaltByteArray, "AES");
-
- // Get a Advanced Encryption Standard, Galois/Counter Mode, No Padding cipher instance. Galois/Counter mode protects against modification of the ciphertext. It doesn't use padding.
- Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
-
- // Set the GCM tag length to be 128 bits (the maximum) and apply the initialization vector.
- GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, initializationVector);
-
- // Initialize the cipher.
- cipher.init(Cipher.DECRYPT_MODE, secretKey, gcmParameterSpec);
-
- // Create a cipher input stream.
- CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);
-
- // Initialize variables to store data as it is moved from the cipher input stream to the unencrypted import file output stream. Move 128 bits (16 bytes) at a time.
- int numberOfBytesRead;
- byte[] decryptedBytes = new byte[16];
-
-
- // Create a private temporary unencrypted import file.
- File temporaryUnencryptedImportFile = File.createTempFile("temporary_unencrypted_import_file", null, getApplicationContext().getCacheDir());
-
- // Create an temporary unencrypted import file output stream.
- FileOutputStream temporaryUnencryptedImportFileOutputStream = new FileOutputStream(temporaryUnencryptedImportFile);
-
-
- // Read up to 128 bits (16 bytes) of data from the cipher input stream. `-1` will be returned when the end fo the file is reached.
- while ((numberOfBytesRead = cipherInputStream.read(decryptedBytes)) != -1) {
- // Write the data to the temporary unencrypted import file output stream.
- temporaryUnencryptedImportFileOutputStream.write(decryptedBytes, 0, numberOfBytesRead);
- }
-
-
- // Flush the temporary unencrypted import file output stream.
- temporaryUnencryptedImportFileOutputStream.flush();
-
- // Close the streams.
- temporaryUnencryptedImportFileOutputStream.close();
- cipherInputStream.close();
- inputStream.close();
-
- // Wipe the encryption data from memory.
- //noinspection UnusedAssignment
- encryptionPasswordString = "";
- Arrays.fill(saltByteArray, (byte) 0);
- Arrays.fill(initializationVector, (byte) 0);
- Arrays.fill(encryptionPasswordByteArray, (byte) 0);
- Arrays.fill(encryptionPasswordWithSaltByteArray, (byte) 0);
- Arrays.fill(hashedEncryptionPasswordWithSaltByteArray, (byte) 0);
- Arrays.fill(truncatedHashedEncryptionPasswordWithSaltByteArray, (byte) 0);
- Arrays.fill(decryptedBytes, (byte) 0);
-
- // Create a temporary unencrypted import file input stream.
- FileInputStream temporaryUnencryptedImportFileInputStream = new FileInputStream(temporaryUnencryptedImportFile);
-
- // Import the temporary unencrypted import file.
- importStatus = importExportDatabaseHelper.importUnencrypted(temporaryUnencryptedImportFileInputStream, this);
-
- // Close the temporary unencrypted import file input stream.
- temporaryUnencryptedImportFileInputStream.close();
-
- // Delete the temporary unencrypted import file.
- //noinspection ResultOfMethodCallIgnored
- temporaryUnencryptedImportFile.delete();
-
- // Restart Privacy Browser if successful.
- if (importStatus.equals(ImportExportDatabaseHelper.IMPORT_SUCCESSFUL)) {
- restartPrivacyBrowser();
- }
- } catch (Exception exception) {
- // Update the import status.
- importStatus = exception.toString();
- }
- break;
-
- case OPENPGP_ENCRYPTION:
- try {
- // Get a handle for the file provider directory.
- fileProviderDirectory = new File(getApplicationContext().getCacheDir() + "/" + getString(R.string.file_provider_directory));
-
- // Create the file provider directory. Any errors will be handled by the catch statement below.
- //noinspection ResultOfMethodCallIgnored
- fileProviderDirectory.mkdir();
-
- // Set the temporary PGP encrypted import file.
- temporaryPgpEncryptedImportFile = File.createTempFile("temporary_pgp_encrypted_import_file", null, fileProviderDirectory);
-
- // Create a temporary PGP encrypted import file output stream.
- FileOutputStream temporaryPgpEncryptedImportFileOutputStream = new FileOutputStream(temporaryPgpEncryptedImportFile);
-
- // Get an input stream for the file name.
- InputStream inputStream = getContentResolver().openInputStream(Uri.parse(fileNameString));
-
- // Create a transfer byte array.
- byte[] transferByteArray = new byte[1024];
-
- // Create an integer to track the number of bytes read.
- int bytesRead;
-
- // Copy the input stream to the temporary PGP encrypted import file.
- while ((bytesRead = inputStream.read(transferByteArray)) > 0) {
- temporaryPgpEncryptedImportFileOutputStream.write(transferByteArray, 0, bytesRead);
- }
-
- // Flush the temporary PGP encrypted import file output stream.
- temporaryPgpEncryptedImportFileOutputStream.flush();
-
- // Close the streams.
- inputStream.close();
- temporaryPgpEncryptedImportFileOutputStream.close();
-
- // Create an decryption intent for OpenKeychain.
- Intent openKeychainDecryptIntent = new Intent("org.sufficientlysecure.keychain.action.DECRYPT_DATA");
-
- // Include the URI to be decrypted.
- openKeychainDecryptIntent.setData(FileProvider.getUriForFile(this, getString(R.string.file_provider), temporaryPgpEncryptedImportFile));
-
- // Allow OpenKeychain to read the file URI.
- openKeychainDecryptIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-
- // Send the intent to the OpenKeychain package.
- openKeychainDecryptIntent.setPackage("org.sufficientlysecure.keychain");
-
- // Make it so.
- startActivityForResult(openKeychainDecryptIntent, OPENPGP_IMPORT_RESULT_CODE);
-
- // Update the import status.
- importStatus = ImportExportDatabaseHelper.IMPORT_SUCCESSFUL;
- } catch (Exception exception) {
- // Update the import status.
- importStatus = exception.toString();
- }
- break;
- }
-
- // Respond to the import status.
- if (!importStatus.equals(ImportExportDatabaseHelper.IMPORT_SUCCESSFUL)) {
- // Display a snack bar with the import error.
- Snackbar.make(fileNameEditText, getString(R.string.import_failed) + " " + importStatus, Snackbar.LENGTH_INDEFINITE).show();
- }
- } else { // Export is selected.
- // Export according to the encryption type.
- switch (encryptionSpinner.getSelectedItemPosition()) {
- case NO_ENCRYPTION:
- // Get the file name string.
- String noEncryptionFileNameString = fileNameEditText.getText().toString();
-
- try {
- // Get the export file output stream.
- // A file may be opened directly once the minimum API >= 29. <https://developer.android.com/reference/kotlin/android/content/ContentResolver#openfile>
- OutputStream exportFileOutputStream = getContentResolver().openOutputStream(Uri.parse(noEncryptionFileNameString));
-
- // Export the unencrypted file.
- String noEncryptionExportStatus = importExportDatabaseHelper.exportUnencrypted(exportFileOutputStream, this);
-
- // Display an export disposition snackbar.
- if (noEncryptionExportStatus.equals(ImportExportDatabaseHelper.EXPORT_SUCCESSFUL)) {
- Snackbar.make(fileNameEditText, getString(R.string.export_successful), Snackbar.LENGTH_SHORT).show();
- } else {
- Snackbar.make(fileNameEditText, getString(R.string.export_failed) + " " + noEncryptionExportStatus, Snackbar.LENGTH_INDEFINITE).show();
- }
- } catch (FileNotFoundException fileNotFoundException) {
- // Display a snackbar with the exception.
- Snackbar.make(fileNameEditText, getString(R.string.export_failed) + " " + fileNotFoundException, Snackbar.LENGTH_INDEFINITE).show();
- }
- break;
-
- case PASSWORD_ENCRYPTION:
- try {
- // Create a temporary unencrypted export file.
- File temporaryUnencryptedExportFile = File.createTempFile("temporary_unencrypted_export_file", null, getApplicationContext().getCacheDir());
-
- // Create a temporary unencrypted export output stream.
- FileOutputStream temporaryUnencryptedExportOutputStream = new FileOutputStream(temporaryUnencryptedExportFile);
-
- // Populate the temporary unencrypted export.
- String passwordEncryptionExportStatus = importExportDatabaseHelper.exportUnencrypted(temporaryUnencryptedExportOutputStream, this);
-
- // Close the temporary unencrypted export output stream.
- temporaryUnencryptedExportOutputStream.close();
-
- // Create an unencrypted export file input stream.
- FileInputStream unencryptedExportFileInputStream = new FileInputStream(temporaryUnencryptedExportFile);
-
- // Get the encryption password.
- String encryptionPasswordString = encryptionPasswordEditText.getText().toString();
-
- // Initialize a secure random number generator.
- SecureRandom secureRandom = new SecureRandom();
-
- // Get a 256 bit (32 byte) random salt.
- byte[] saltByteArray = new byte[32];
- secureRandom.nextBytes(saltByteArray);
-
- // Convert the encryption password to a byte array.
- byte[] encryptionPasswordByteArray = encryptionPasswordString.getBytes(StandardCharsets.UTF_8);
-
- // Append the salt to the encryption password byte array. This protects against rainbow table attacks.
- byte[] encryptionPasswordWithSaltByteArray = new byte[encryptionPasswordByteArray.length + saltByteArray.length];
- System.arraycopy(encryptionPasswordByteArray, 0, encryptionPasswordWithSaltByteArray, 0, encryptionPasswordByteArray.length);
- System.arraycopy(saltByteArray, 0, encryptionPasswordWithSaltByteArray, encryptionPasswordByteArray.length, saltByteArray.length);
-
- // Get a SHA-512 message digest.
- MessageDigest messageDigest = MessageDigest.getInstance("SHA-512");
-
- // Hash the salted encryption password. Otherwise, any characters after the 32nd character in the password are ignored.
- byte[] hashedEncryptionPasswordWithSaltByteArray = messageDigest.digest(encryptionPasswordWithSaltByteArray);
-
- // Truncate the encryption password byte array to 256 bits (32 bytes).
- byte[] truncatedHashedEncryptionPasswordWithSaltByteArray = Arrays.copyOf(hashedEncryptionPasswordWithSaltByteArray, 32);
-
- // Create an AES secret key from the encryption password byte array.
- SecretKeySpec secretKey = new SecretKeySpec(truncatedHashedEncryptionPasswordWithSaltByteArray, "AES");
-
- // Generate a random 12 byte initialization vector. According to NIST, a 12 byte initialization vector is more secure than a 16 byte one.
- byte[] initializationVector = new byte[12];
- secureRandom.nextBytes(initializationVector);
-
- // Get a Advanced Encryption Standard, Galois/Counter Mode, No Padding cipher instance. Galois/Counter mode protects against modification of the ciphertext. It doesn't use padding.
- Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
-
- // Set the GCM tag length to be 128 bits (the maximum) and apply the initialization vector.
- GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, initializationVector);
-
- // Initialize the cipher.
- cipher.init(Cipher.ENCRYPT_MODE, secretKey, gcmParameterSpec);
-
- // Get the file name string.
- String passwordEncryptionFileNameString = fileNameEditText.getText().toString();
-
- // Get the export file output stream.
- OutputStream exportFileOutputStream = getContentResolver().openOutputStream(Uri.parse(passwordEncryptionFileNameString));
-
- // Add the salt and the initialization vector to the export file output stream.
- exportFileOutputStream.write(saltByteArray);
- exportFileOutputStream.write(initializationVector);
-
- // Create a cipher output stream.
- CipherOutputStream cipherOutputStream = new CipherOutputStream(exportFileOutputStream, cipher);
-
- // Initialize variables to store data as it is moved from the unencrypted export file input stream to the cipher output stream. Move 128 bits (16 bytes) at a time.
- int numberOfBytesRead;
- byte[] encryptedBytes = new byte[16];
-
- // Read up to 128 bits (16 bytes) of data from the unencrypted export file stream. `-1` will be returned when the end of the file is reached.
- while ((numberOfBytesRead = unencryptedExportFileInputStream.read(encryptedBytes)) != -1) {
- // Write the data to the cipher output stream.
- cipherOutputStream.write(encryptedBytes, 0, numberOfBytesRead);
- }
-
- // Close the streams.
- cipherOutputStream.flush();
- cipherOutputStream.close();
- exportFileOutputStream.close();
- unencryptedExportFileInputStream.close();
-
- // Wipe the encryption data from memory.
- //noinspection UnusedAssignment
- encryptionPasswordString = "";
- Arrays.fill(saltByteArray, (byte) 0);
- Arrays.fill(encryptionPasswordByteArray, (byte) 0);
- Arrays.fill(encryptionPasswordWithSaltByteArray, (byte) 0);
- Arrays.fill(hashedEncryptionPasswordWithSaltByteArray, (byte) 0);
- Arrays.fill(truncatedHashedEncryptionPasswordWithSaltByteArray, (byte) 0);
- Arrays.fill(initializationVector, (byte) 0);
- Arrays.fill(encryptedBytes, (byte) 0);
-
- // Delete the temporary unencrypted export file.
- //noinspection ResultOfMethodCallIgnored
- temporaryUnencryptedExportFile.delete();
-
- // Display an export disposition snackbar.
- if (passwordEncryptionExportStatus.equals(ImportExportDatabaseHelper.EXPORT_SUCCESSFUL)) {
- Snackbar.make(fileNameEditText, getString(R.string.export_successful), Snackbar.LENGTH_SHORT).show();
- } else {
- Snackbar.make(fileNameEditText, getString(R.string.export_failed) + " " + passwordEncryptionExportStatus, Snackbar.LENGTH_INDEFINITE).show();
- }
- } catch (Exception exception) {
- // Display a snackbar with the exception.
- Snackbar.make(fileNameEditText, getString(R.string.export_failed) + " " + exception, Snackbar.LENGTH_INDEFINITE).show();
- }
- break;
-
- case OPENPGP_ENCRYPTION:
- try {
- // Get a handle for the file provider directory.
- fileProviderDirectory = new File(getApplicationContext().getCacheDir() + "/" + getString(R.string.file_provider_directory));
-
- // Create the file provider directory. Any errors will be handled by the catch statement below.
- //noinspection ResultOfMethodCallIgnored
- fileProviderDirectory.mkdir();
-
- // Set the temporary pre-encrypted export file.
- temporaryPreEncryptedExportFile = new File(fileProviderDirectory + "/" + getString(R.string.settings) + " " + BuildConfig.VERSION_NAME + ".pbs");
-
- // Delete the temporary pre-encrypted export file if it already exists.
- if (temporaryPreEncryptedExportFile.exists()) {
- //noinspection ResultOfMethodCallIgnored
- temporaryPreEncryptedExportFile.delete();
- }
-
- // Create a temporary pre-encrypted export output stream.
- FileOutputStream temporaryPreEncryptedExportOutputStream = new FileOutputStream(temporaryPreEncryptedExportFile);
-
- // Populate the temporary pre-encrypted export file.
- String openpgpEncryptionExportStatus = importExportDatabaseHelper.exportUnencrypted(temporaryPreEncryptedExportOutputStream, this);
-
- // Flush the temporary pre-encryption export output stream.
- temporaryPreEncryptedExportOutputStream.flush();
-
- // Close the temporary pre-encryption export output stream.
- temporaryPreEncryptedExportOutputStream.close();
-
- // Display an export error snackbar if the temporary pre-encrypted export failed.
- if (!openpgpEncryptionExportStatus.equals(ImportExportDatabaseHelper.EXPORT_SUCCESSFUL)) {
- Snackbar.make(fileNameEditText, getString(R.string.export_failed) + " " + openpgpEncryptionExportStatus, Snackbar.LENGTH_INDEFINITE).show();
- }
-
- // Create an encryption intent for OpenKeychain.
- Intent openKeychainEncryptIntent = new Intent("org.sufficientlysecure.keychain.action.ENCRYPT_DATA");
-
- // Include the temporary unencrypted export file URI.
- openKeychainEncryptIntent.setData(FileProvider.getUriForFile(this, getString(R.string.file_provider), temporaryPreEncryptedExportFile));
-
- // Allow OpenKeychain to read the file URI.
- openKeychainEncryptIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-
- // Send the intent to the OpenKeychain package.
- openKeychainEncryptIntent.setPackage("org.sufficientlysecure.keychain");
-
- // Make it so.
- startActivityForResult(openKeychainEncryptIntent, OPENPGP_EXPORT_RESULT_CODE);
- } catch (Exception exception) {
- // Display a snackbar with the exception.
- Snackbar.make(fileNameEditText, getString(R.string.export_failed) + " " + exception, Snackbar.LENGTH_INDEFINITE).show();
- }
- break;
- }
- }
- }
-
- private void restartPrivacyBrowser() {
- // Create an intent to restart Privacy Browser.
- Intent restartIntent = getParentActivityIntent();
-
- // Assert that the intent is not null to remove the lint error below.
- assert restartIntent != null;
-
- // `Intent.FLAG_ACTIVITY_CLEAR_TASK` removes all activities from the stack. It requires `Intent.FLAG_ACTIVITY_NEW_TASK`.
- restartIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
-
- // Create a restart handler.
- Handler restartHandler = new Handler();
-
- // Create a restart runnable.
- Runnable restartRunnable = () -> {
- // Restart Privacy Browser.
- startActivity(restartIntent);
-
- // Kill this instance of Privacy Browser. Otherwise, the app exhibits sporadic behavior after the restart.
- System.exit(0);
- };
-
- // Restart Privacy Browser after 150 milliseconds to allow enough time for the preferences to be saved.
- restartHandler.postDelayed(restartRunnable, 150);
- }
-}
projects / PrivacyBrowserAndroid.git / blobdiff