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+/**
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+ * Nextcloud Android client application
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+ *
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+ * @author Mario Danic
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+ * Copyright (C) 2017 Mario Danic
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+ *
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+ * This program is free software: you can redistribute it and/or modify
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+ * it under the terms of the GNU Affero General Public License as published by
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+ * the Free Software Foundation, either version 3 of the License, or
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+ * at your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU Affero General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU Affero General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+package com.owncloud.android.utils;
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+
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+import android.accounts.Account;
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+import android.accounts.AuthenticatorException;
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+import android.accounts.OperationCanceledException;
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+import android.content.Context;
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+import android.text.TextUtils;
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+import android.util.Base64;
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+
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+import com.owncloud.android.MainApp;
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+import com.owncloud.android.R;
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+import com.owncloud.android.authentication.AccountUtils;
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+import com.owncloud.android.db.PreferenceManager;
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+import com.owncloud.android.lib.common.OwnCloudAccount;
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+import com.owncloud.android.lib.common.OwnCloudClient;
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+import com.owncloud.android.lib.common.OwnCloudClientManagerFactory;
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+import com.owncloud.android.lib.common.operations.RemoteOperation;
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+import com.owncloud.android.lib.common.operations.RemoteOperationResult;
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+import com.owncloud.android.lib.common.utils.Log_OC;
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+import com.owncloud.android.lib.resources.notifications.RegisterAccountDeviceForNotificationsOperation;
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+import com.owncloud.android.lib.resources.notifications.RegisterAccountDeviceForProxyOperation;
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+import com.owncloud.android.lib.resources.notifications.models.PushResponse;
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+
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+import java.io.File;
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+import java.io.FileInputStream;
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+import java.io.FileNotFoundException;
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+import java.io.FileOutputStream;
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+import java.io.IOException;
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+import java.security.Key;
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+import java.security.KeyFactory;
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+import java.security.KeyPair;
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+import java.security.KeyPairGenerator;
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+import java.security.MessageDigest;
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+import java.security.NoSuchAlgorithmException;
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+import java.security.PublicKey;
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+import java.security.spec.InvalidKeySpecException;
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+import java.security.spec.PKCS8EncodedKeySpec;
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+import java.security.spec.X509EncodedKeySpec;
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+
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+public class PushUtils {
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+
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+ private static final String TAG = "PushUtils";
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+ private static final String KEYPAIR_FOLDER = "nc-keypair";
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+ private static final String KEYPAIR_FILE_NAME = "push_key";
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+ private static final String KEYPAIR_PRIV_EXTENSION = ".priv";
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+ private static final String KEYPAIR_PUB_EXTENSION = ".pub";
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+
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+ public static String generateSHA512Hash(String pushToken) {
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+ MessageDigest messageDigest = null;
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+ try {
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+ messageDigest = MessageDigest.getInstance("SHA-512");
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+ messageDigest.update(pushToken.getBytes());
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+ return bytesToHex(messageDigest.digest());
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+ } catch (NoSuchAlgorithmException e) {
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+ Log_OC.d(TAG, "SHA-512 algorithm not supported");
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+ }
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+ return "";
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+ }
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+
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+ private static String bytesToHex(byte[] bytes) {
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+ StringBuilder result = new StringBuilder();
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+ for (byte individualByte : bytes) {
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+ result.append(Integer.toString((individualByte & 0xff) + 0x100, 16)
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+ .substring(1));
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+ }
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+ return result.toString();
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+ }
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+
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+ public static int generateRsa2048KeyPair() {
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+ String keyPath = MainApp.getStoragePath() + File.separator + MainApp.getDataFolder() + File.separator
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+ + KEYPAIR_FOLDER;
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+
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+ String privateKeyPath = keyPath + File.separator + KEYPAIR_FILE_NAME + KEYPAIR_PRIV_EXTENSION;
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+ String publicKeyPath = keyPath + File.separator + KEYPAIR_FILE_NAME + KEYPAIR_PUB_EXTENSION;
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+ File keyPathFile = new File(keyPath);
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+
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+ if (!new File(privateKeyPath).exists() && !new File(publicKeyPath).exists()) {
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+ try {
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+ if (!keyPathFile.exists()) {
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+ keyPathFile.mkdir();
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+ }
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+ KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA");
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+ keyGen.initialize(2048);
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+
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+ KeyPair pair = keyGen.generateKeyPair();
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+ int statusPrivate = saveKeyToFile(pair.getPrivate(), privateKeyPath);
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+ int statusPublic = saveKeyToFile(pair.getPublic(), publicKeyPath);
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+
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+ if (statusPrivate == 0 && statusPublic == 0) {
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+ // all went well
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+ return 0;
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+ } else {
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+ return -2;
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+ }
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+ } catch (NoSuchAlgorithmException e) {
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+ Log_OC.d(TAG, "RSA algorithm not supported");
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+ }
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+ } else {
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+ // we already have the key
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+ return -1;
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+ }
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+
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+ // we failed to generate the key
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+ return -2;
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+ }
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+
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+ public static void pushRegistrationToServer() {
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+ String token = PreferenceManager.getPushToken(MainApp.getAppContext());
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+ if (!TextUtils.isEmpty(MainApp.getAppContext().getResources().getString(R.string.push_server_url)) &&
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+ !TextUtils.isEmpty(token)) {
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+ PushUtils.generateRsa2048KeyPair();
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+ String pushTokenHash = PushUtils.generateSHA512Hash(token).toLowerCase();
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+ PublicKey devicePublicKey = (PublicKey) PushUtils.readKeyFromFile(true);
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+ if (devicePublicKey != null) {
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+ byte[] publicKeyBytes = Base64.encode(devicePublicKey.getEncoded(), Base64.NO_WRAP);
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+ String publicKey = new String(publicKeyBytes);
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+ publicKey = publicKey.replaceAll("(.{64})", "$1\n");
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+
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+ publicKey = "-----BEGIN PUBLIC KEY-----\n" + publicKey + "\n-----END PUBLIC KEY-----\n";
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+
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+ Context context = MainApp.getAppContext();
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+ for (Account account : AccountUtils.getAccounts(context)) {
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+ try {
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+ OwnCloudAccount ocAccount = new OwnCloudAccount(account, context);
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+ OwnCloudClient mClient = OwnCloudClientManagerFactory.getDefaultSingleton().
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+ getClientFor(ocAccount, context);
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+
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+ RemoteOperation registerAccountDeviceForNotificationsOperation =
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+ new RegisterAccountDeviceForNotificationsOperation(pushTokenHash,
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+ publicKey,
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+ context.getResources().getString(R.string.push_server_url));
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+
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+ RemoteOperationResult remoteOperationResult = registerAccountDeviceForNotificationsOperation.
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+ execute(mClient);
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+
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+ if (remoteOperationResult.isSuccess()) {
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+ PushResponse pushResponse = remoteOperationResult.getPushResponseData();
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+
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+ RemoteOperation registerAccountDeviceForProxyOperation = new
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+ RegisterAccountDeviceForProxyOperation(
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+ context.getResources().getString(R.string.push_server_url),
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+ token, pushResponse.getDeviceIdentifier(), pushResponse.getSignature(),
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+ pushResponse.getPublicKey());
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+
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+ remoteOperationResult = registerAccountDeviceForProxyOperation.execute(mClient);
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+ PreferenceManager.setPushTokenLastSentTime(MainApp.getAppContext(),
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+ System.currentTimeMillis());
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+
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+ }
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+ } catch (com.owncloud.android.lib.common.accounts.AccountUtils.AccountNotFoundException e) {
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+ Log_OC.d(TAG, "Failed to find an account");
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+ } catch (AuthenticatorException e) {
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+ Log_OC.d(TAG, "Failed via AuthenticatorException");
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+ } catch (IOException e) {
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+ Log_OC.d(TAG, "Failed via IOException");
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+ } catch (OperationCanceledException e) {
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+ Log_OC.d(TAG, "Failed via OperationCanceledException");
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+ }
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+ }
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+ }
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+ }
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+ }
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+
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+ public static Key readKeyFromFile(boolean readPublicKey) {
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+ String keyPath = MainApp.getStoragePath() + File.separator + MainApp.getDataFolder() + File.separator
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+ + KEYPAIR_FOLDER;
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+ ;
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+ String privateKeyPath = keyPath + File.separator + KEYPAIR_FILE_NAME + KEYPAIR_PRIV_EXTENSION;
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+ String publicKeyPath = keyPath + File.separator + KEYPAIR_FILE_NAME + KEYPAIR_PUB_EXTENSION;
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+
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+ String path;
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+
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+ if (readPublicKey) {
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+ path = publicKeyPath;
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+ } else {
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+ path = privateKeyPath;
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+ }
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+
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+ FileInputStream fileInputStream = null;
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+ try {
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+ fileInputStream = new FileInputStream(path);
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+ byte[] bytes = new byte[fileInputStream.available()];
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+ fileInputStream.read(bytes);
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+ fileInputStream.close();
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+
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+ KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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+
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+ if (readPublicKey) {
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+ X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
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+ return keyFactory.generatePublic(keySpec);
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+ } else {
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+ PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
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+ return keyFactory.generatePrivate(keySpec);
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+ }
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+
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+ } catch (FileNotFoundException e) {
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+ Log_OC.d(TAG, "Failed to find path while reading the Key");
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+ } catch (IOException e) {
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+ Log_OC.d(TAG, "IOException while reading the key");
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+ } catch (InvalidKeySpecException e) {
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+ Log_OC.d(TAG, "InvalidKeySpecException while reading the key");
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+ } catch (NoSuchAlgorithmException e) {
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+ Log_OC.d(TAG, "RSA algorithm not supported");
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+ }
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+
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+ return null;
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+ }
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+
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+ private static int saveKeyToFile(Key key, String path) {
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+ byte[] encoded = key.getEncoded();
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+ FileOutputStream keyFileOutputStream = null;
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+ try {
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+ if (!new File(path).exists()) {
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+ new File(path).createNewFile();
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+ }
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+ keyFileOutputStream = new FileOutputStream(path);
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+ keyFileOutputStream.write(encoded);
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+ keyFileOutputStream.close();
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+ return 0;
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+ } catch (FileNotFoundException e) {
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+ Log_OC.d(TAG, "Failed to save key to file");
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+ } catch (IOException e) {
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+ Log_OC.d(TAG, "Failed to save key to file via IOException");
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+ }
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+
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+ return -1;
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+ }
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+}
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