Utils.kt

    fun getSecretKey(sharedPref: SharedPreferences): SecretKey {

        val key = sharedPref.getString(AppConstants.secretKeyPref, null)

        if (key == null) {
            //generate secure random
            val secretKey = generateSecreKey()
            saveSecretKey(sharedPref, secretKey!!)
            return secretKey
        }

        val decodedKey = Base64.decode(key, Base64.NO_WRAP)
        val originalKey = SecretKeySpec(decodedKey, 0, decodedKey.size, "AES")

        return originalKey
    }