Simple example of using EncrypredSharedPreferences

SampleEncPrefs.kt

package com.scottyab.whatsnewplayground.data

import android.content.Context
import android.content.SharedPreferences
import androidx.security.crypto.EncryptedSharedPreferences
import androidx.security.crypto.MasterKeys
import com.scottyab.whatsnewplayground.BuildConfig

internal class SampleEncPrefs(context: Context) {

    private val sharedPrefs: SharedPreferences

    init {
        val keyGenParameterSpec = MasterKeys.AES256_GCM_SPEC
        val masterKeyAlias = MasterKeys.getOrCreate(keyGenParameterSpec)

        sharedPrefs = EncryptedSharedPreferences
            .create(
                FILENAME,
                masterKeyAlias,
                context,
                EncryptedSharedPreferences.PrefKeyEncryptionScheme.AES256_SIV,
                EncryptedSharedPreferences.PrefValueEncryptionScheme.AES256_GCM
            )
    }

    var userId: String
        get() = sharedPrefs.getStringOrEmpty(USER_ID)
        set(value) = sharedPrefs.edit().putString(USER_ID, value).apply()

    var email: String
        get() = sharedPrefs.getStringOrEmpty(EMAIL)
        set(value) = sharedPrefs.edit().putString(EMAIL, value).apply()

    var accessToken: String
        get() = sharedPrefs.getStringOrEmpty(TOKEN)
        set(value) = sharedPrefs.edit().putString(TOKEN, value).apply()

    private fun SharedPreferences.getStringOrEmpty(key: String): String = getString(key, "") ?: ""

    companion object {
        private const val FILENAME = "my.secure.sharedPrefs"
        private const val USER_ID = BuildConfig.APPLICATION_ID + ".USER_ID"
        private const val EMAIL = BuildConfig.APPLICATION_ID + ".EMAIL"
        private const val TOKEN = BuildConfig.APPLICATION_ID + ".TOKEN"
    }
}