Secure User Storage

secureUserStorage.kt

class SecureUserStorage {
    fun putUser(user: User, context: Context) {
        val sharedpreferences = context.getSharedPreferences("userPrefs", Context.MODE_PRIVATE)
        val crypto = Crypto(
                SharedPrefsBackedKeyChain(context),
                SystemNativeCryptoLibrary())

        try {
            val json = LoganSquare.serialize(user)
            val cipherArray = crypto.encrypt(json.toByteArray(), Entity("user"))
            val cipherString = Base64.encodeToString(cipherArray, Base64.NO_WRAP)
            sharedpreferences.edit().putString("userObject", cipherString).apply()
        } catch (e: KeyChainException) {
            e.printStackTrace()
        } catch (e: CryptoInitializationException) {
            e.printStackTrace()
        } catch (e: IOException) {
            e.printStackTrace()
        }

    }

    fun getUser(context: Context): User? {
        val sharedpreferences = context.getSharedPreferences("userPrefs", Context.MODE_PRIVATE)
        val crypto = Crypto(
                SharedPrefsBackedKeyChain(context),
                SystemNativeCryptoLibrary())

        try {
            val plainArray = Base64.decode(sharedpreferences.getString("userObject", ""), Base64.DEFAULT)
            val cipherJsonArray = crypto.decrypt(plainArray, Entity("user"))
            val cipherJson = String(cipherJsonArray)
            return LoganSquare.parse(cipherJson, User::class.java)
        } catch (e: KeyChainException) {
            e.printStackTrace()
        } catch (e: CryptoInitializationException) {
            e.printStackTrace()
        } catch (e: IOException) {
            e.printStackTrace()
        } catch (noUser: ArrayIndexOutOfBoundsException) {
            return null
        }

        return null
    }

    fun deleteUser(context: Context) {
        val sharedpreferences = context.getSharedPreferences("userPrefs", Context.MODE_PRIVATE)
        sharedpreferences.edit().remove("userObject").apply()
    }
}