110 lines
3.7 KiB
Kotlin
110 lines
3.7 KiB
Kotlin
/**
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* ProjectLaogai
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*
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* Copyright 2019-2020 <seil0@mosad.xyz>
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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 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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package org.mosad.seil0.projectlaogai.controller.preferences
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import android.content.Context
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import android.content.SharedPreferences
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import android.security.keystore.KeyGenParameterSpec
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import android.security.keystore.KeyProperties
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import android.util.Log
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import androidx.security.crypto.EncryptedSharedPreferences
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import androidx.security.crypto.MasterKey
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import org.mosad.seil0.projectlaogai.R
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object EncryptedPreferences {
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var email = ""
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internal set
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/**
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* save user email and password to encrypted preference
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*/
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fun saveCredentials(email: String, password: String, context: Context) {
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this.email = email
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with (getEncryptedPreferences(context)?.edit()) {
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this?.putString(context.getString(R.string.save_key_user_email), email)
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this?.putString(context.getString(R.string.save_key_user_password), password)
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this?.apply()
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}
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}
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/**
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* read user email and password from encrypted preference
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* @return Pair(email, password)
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*/
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fun readCredentials(context: Context): Pair<String, String> {
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return with (getEncryptedPreferences(context)) {
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email = this?.getString(context.getString(R.string.save_key_user_email), "").toString()
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Pair(
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this?.getString(context.getString(R.string.save_key_user_email), "").toString(),
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this?.getString(context.getString(R.string.save_key_user_password), "").toString()
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)
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}
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}
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/**
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* initially load the stored values
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*/
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fun load(context: Context) {
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with(getEncryptedPreferences(context)) {
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email = this?.getString(
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context.getString(R.string.save_key_user_email), ""
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).toString()
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}
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}
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/**
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* create a encrypted shared preference
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*/
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private fun getEncryptedPreferences(context: Context): SharedPreferences? {
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return try {
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val spec = KeyGenParameterSpec.Builder(MasterKey.DEFAULT_MASTER_KEY_ALIAS,
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KeyProperties.PURPOSE_ENCRYPT or KeyProperties.PURPOSE_DECRYPT)
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.setBlockModes(KeyProperties.BLOCK_MODE_GCM)
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.setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
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.setKeySize(MasterKey.DEFAULT_AES_GCM_MASTER_KEY_SIZE)
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.build()
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val masterKey = MasterKey.Builder(context)
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.setKeyGenParameterSpec(spec)
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.build()
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EncryptedSharedPreferences.create(
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context,
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context.getString(R.string.encrypted_preference_file_key),
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masterKey,
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EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
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EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
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)
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} catch (ex: Exception) {
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Log.e(javaClass.name, "Could not create encrypted shared preference.", ex)
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null
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}
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}
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} |