/** * ProjectLaogai * * Copyright 2019-2020 * * 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301, USA. * */ package org.mosad.seil0.projectlaogai.controller.login import android.content.Context import android.content.SharedPreferences import android.security.keystore.KeyGenParameterSpec import android.security.keystore.KeyProperties import android.util.Log import androidx.security.crypto.EncryptedSharedPreferences import androidx.security.crypto.MasterKey import org.mosad.seil0.projectlaogai.R object LoginController { var email = "" internal set /** * initially load the users email */ fun load(context: Context) { with(getEncryptedPreferences(context)) { email = this?.getString( context.getString(R.string.save_key_user_email), context.getString(R.string.sample_user) ).toString() } } /** * save user email and password to encrypted preference */ fun saveCredentials(email: String, password: String, context: Context) { this.email = email with (getEncryptedPreferences(context)?.edit()) { this?.putString(context.getString(R.string.save_key_user_email), email) this?.putString(context.getString(R.string.save_key_user_password), password) this?.apply() } } /** * read user email and password from encrypted preference */ fun readCredentials(context: Context): Pair { return with (getEncryptedPreferences(context)) { email = this?.getString(context.getString(R.string.save_key_user_email), "").toString() Pair( this?.getString(context.getString(R.string.save_key_user_email), "").toString(), this?.getString(context.getString(R.string.save_key_user_password), "").toString() ) } } /** * create a encrypted shared preference */ private fun getEncryptedPreferences(context: Context): SharedPreferences? { return try { val spec = KeyGenParameterSpec.Builder(MasterKey.DEFAULT_MASTER_KEY_ALIAS, KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT) .setBlockModes(KeyProperties.BLOCK_MODE_GCM) .setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE) .setKeySize(MasterKey.DEFAULT_AES_GCM_MASTER_KEY_SIZE) .build() val masterKey = MasterKey.Builder(context) .setKeyGenParameterSpec(spec) .build() EncryptedSharedPreferences.create( context, context.getString(R.string.encrypted_preference_file_key), masterKey, EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV, EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM ) } catch (ex: Exception) { Log.e(javaClass.name, "Could not create encrypted shared preference.", ex) null } } }