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/**
* ProjectLaogai
*
* Copyright 2019-2020 <seil0@mosad.xyz>
*
* 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<String, String> {
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
}
}
}

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