@ohos.app.ability.contextConstant (ContextConstant)
The ContextConstant module defines context-related enums. Currently, it defines only the enum of encryption levels.
NOTE
The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
The APIs of this module can be used only in the stage model.
Modules to Import
import contextConstant from '@ohos.app.ability.contextConstant';
ContextConstant.AreaMode
Enumerates the data encryption levels.
Atomic service API: This API can be used in atomic services since API version 11.
System capability: SystemCapability.Ability.AbilityRuntime.Core
| Name | Value | Description |
|---|---|---|
| EL1 | 0 | Device-level encryption. Directories with this encryption level are accessible after the device is powered on. |
| EL2 | 1 | User-level encryption. Directories with this encryption level are accessible only after the device is powered on and the password is entered (for the first time). |
| EL311+ | 2 | User-level encryption. The file permissions vary according to their scenarios. - An open file is always readable and writable regardless of whether the screen is locked. - When the screen is locked, a closed file cannot be opened, read, or written. When the screen is unlocked, such a file can be opened, read, and written. - When the screen is locked, a file can be created and then opened and written but not read. When the screen is unlocked, a file can be created and then opened, read, and written. |
| EL411+ | 3 | User-level encryption. The file permissions vary according to their scenarios. - When the screen is locked, an open file is readable and writable in FEB2.0, but not in FEB3.0. When the screen is unlocked, such a file is always readable and writable. - When the screen is locked, a closed file cannot be opened, read, or written. When the screen is unlocked, such a file can be opened, read, and written. - When the screen is locked, a file cannot be created. When the screen is unlocked, a file can be created and then opened, read, and written. |