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Packageflash.data
Classpublic class EncryptedLocalStore
InheritanceEncryptedLocalStore Inheritance Object

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

The EncryptedLocalStore class (ELS) provides an encrypted local storage mechanism that can be used as a small cache for an application's private data.

ELS data cannot be shared between applications. The intent of ELS is to allow an application to store easily recreated items such as login credentials and other private information. ELS data should not be considered as permanent; see "Limitations of the encrypted local store" and "Best practices for using ELS." below.

AIR profile support: This feature is not supported on AIR for TV devices. You can test for support at run time using the EncryptedLocalStore.isSupported property. See AIR Profile Support for more information regarding API support across multiple profiles.

AIR provides an encrypted local store (ELS) for each AIR application installed on a user's computer or device. This lets you save and retrieve data that is stored on the user’s local hard drive in an encrypted format that cannot easily be deciphered by other users. A separate encrypted local store is used for each AIR application, and each AIR application uses a separate encrypted local store for each user account on the computer.

Use the encrypted local store to cache information that must be secured, such as login credentials for web services. The ELS is appropriate for storing information that must be kept private from other users. It does not, however, protect the data from other processes run under the same user account. It is thus not appropriate for protecting secret application data, such as DRM or encryption keys.

AIR uses DPAPI on Windows, KeyChain on Mac OS and iOS, and KeyRing or KWallet on Linux to associate the encrypted local store to each application and user. The encrypted local store uses AES-CBC 128-bit encryption.

On Android, the data stored by the EncryptedLocalStorage class are not encrypted. Instead the data is protected by the user-level security provided by the operating system. The Android operating system assigns every application a separate user ID. Applications can only access their own files and files created in public locations (such as the removable storage card). Note that on rooted Android devices, applications running with root privileges can access the files of other applications. Thus on a rooted device, the encrypted local store does not provide as high a level of data protection as it does on on a non-rooted device.

Information in the encrypted local store is only available to AIR application content in the application security sandbox.

If you update an AIR application, the updated version retains access to any existing data in the encrypted local store unless:

  • The items were added with the stronglyBound parameter set to true
  • You have upgraded from the AIR 3.2 namespace to AIR 3.3 (the physical location of the encrypted local store changed between AIR 3.2 and AIR 3.3 for both Mac OS and Windows)
  • The existing and update versions are both published prior to AIR 1.5.3 and the update is signed with a migration signature

Limitations of the encrypted local store

The data in the encrypted local store is protected by the user’s operating system account credentials. Other entities cannot access the data in the store unless they can login as that user. However, the data is not secure against access by other applications run by an authenticated user. Thus, data that your application may want to keep secret from users, such as keys used for licensing or digital rights management, is not secure. The ELS is not an appropriate location for storing such information. It is only an appropriate place for storing a user’s private data, such as passwords.

Data in the ELS can be lost for a variety of reasons. For example, the user could uninstall the application and delete the encrypted file. Or, the publisher ID could be changed as a result of an update. Thus the ELS should be treated as a private cache, not permanent data storage.

The stronglyBound parameter is deprecated and should not be set to true. Setting the parameter to true does not provide any additional protection for data. At the same time, access to the data is lost whenever the application is updated — even if the publisher ID stays the same.

The encrypted local store may perform more slowly if the stored data exceeds 10MB.

When you uninstall an AIR application, the uninstaller does not delete data stored in the encrypted local store.

Best practices for using ELS

The best practices for using the ELS include:

  • Use the ELS to store sensitive user data such as passwords (setting stronglyBound to false)
  • Do not use the ELS to store applications secrets such as DRM keys or licensing tokens
  • Provide a way for your application to recreate the data stored in the ELS if the ELS data is lost. For example, by prompting the user to re-enter their account credentials when necessary.
  • Do not use the stronglyBound parameter.
  • If you do set stronglyBound to true, do not migrate stored items during an update. Recreate the data after the update instead.
  • Only store relatively small amounts of data. For large amounts of data, use an AIR SQL database with encryption.

Items in the encrypted local store are identified with a string. All items are stored as byte array data.

View the examples

More examples



Public Properties
 PropertyDefined By
 Inheritedconstructor : Object
A reference to the class object or constructor function for a given object instance.
Object
      isSupported : Boolean
[static] [read-only] The isSupported property is set to true if the EncryptedLocalStore class is supported on the current platform, otherwise it is set to false.
EncryptedLocalStore
Public Methods
 MethodDefined By
  
    getItem(name:String):ByteArray
[static] The data corresponding to the specified name.
EncryptedLocalStore
 Inherited
Indicates whether an object has a specified property defined.
Object
 Inherited
Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter.
Object
 Inherited
Indicates whether the specified property exists and is enumerable.
Object
  
    removeItem(name:String):void
[static] Removes the item with the given name from the encrypted local store.
EncryptedLocalStore
  
    reset():void
[static] Clears the entire encrypted local store, deleting all data.
EncryptedLocalStore
  
    setItem(name:String, data:ByteArray, stronglyBound:Boolean = false):void
[static] Stores a ByteArray object under the specified name.
EncryptedLocalStore
 Inherited
Sets the availability of a dynamic property for loop operations.
Object
 Inherited
Returns the string representation of this object, formatted according to locale-specific conventions.
Object
 Inherited
Returns the string representation of the specified object.
Object
 Inherited
Returns the primitive value of the specified object.
Object
Property Detail
    

isSupported

property
isSupported:Boolean  [read-only]

Language Version: ActionScript 3.0
Runtime Versions: AIR 2

The isSupported property is set to true if the EncryptedLocalStore class is supported on the current platform, otherwise it is set to false.



Implementation
    public static function get isSupported():Boolean
Method Detail

    getItem

()method
public static function getItem(name:String):ByteArray

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

The data corresponding to the specified name.

If an item does not exist by the specified name, this method returns null.

Parameters

name:String — The name of the item in the encrypted local store.

Returns
ByteArray — The ByteArray data. If there is no data for the provided name, the method returns null.

Throws
ArgumentError — The name value is null or an empty string.

    removeItem

()method 
public static function removeItem(name:String):void

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

Removes the item with the given name from the encrypted local store.

Parameters

name:String — The name of the item in the encrypted local store.


Throws
ArgumentError — The name value is null or an empty string.

    reset

()method 
public static function reset():void

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

Clears the entire encrypted local store, deleting all data.

    setItem

()method 
public static function setItem(name:String, data:ByteArray, stronglyBound:Boolean = false):void

Language Version: ActionScript 3.0
Runtime Versions: AIR 1.0

Stores a ByteArray object under the specified name.

Parameters

name:String — The name of the item in the encrypted local store.
 
data:ByteArray — The data.
 
stronglyBound:Boolean (default = false) — (deprecated) The stronglyBound parameter should be set to false (the default value). If set to true, the stored item cannot be retrieved if any application files are altered. For example,if a user installs an update of your application, the updated application cannot read any strongly bound data that was previously written to the encrypted local store.


Throws
ArgumentError — The name value is null or an empty string.
 
ArgumentError — The data value is null.
EncryptedLocalStore.1.as

The following code stores a string in the encrypted local store, retrieves it, and then deletes it:
var str:String = "Bob";
var bytes:ByteArray = new ByteArray();
bytes.writeUTFBytes(str);
EncryptedLocalStore.setItem("firstName", bytes);

var storedValue:ByteArray = EncryptedLocalStore.getItem("firstName");
trace(storedValue.readUTFBytes(storedValue.length)); // "Bob"

EncryptedLocalStore.removeItem("firstName");