Java tutorial
//package com.java2s; /* * Copyright (C) 2014 Markus Grieder * * This program 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. * * This program 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 this program. If not, see * <http://www.gnu.org/licenses/gpl-3.0.html>. */ import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import android.accounts.Account; import android.accounts.AccountManager; import android.text.TextUtils; import android.util.Base64; public class Main { private static final String PRIVATE_KEY = "com.myllih.android.sync.key"; /** * * Get Private Key or return null. * * @param account * the account we're syncing * @return Private Key */ public static SecretKey getPrivateKey(Account account, AccountManager accountManager) { // TODO: Redesign more secure location to safe private key? String keyString = accountManager.getUserData(account, PRIVATE_KEY); SecretKey key = null; if (!TextUtils.isEmpty(keyString)) { key = new SecretKeySpec(Base64.decode(keyString, Base64.DEFAULT), "AES"); } return key; } }