A power management method for a multi-task TF cryptographic module

Abstract

The invention discloses a power management method for a multi-task TF (Trans-flash) password module. The power management method comprises the following steps that: an Android terminal recognizes the TF password module through a TF password module driver; a TF power management module performs initialization, and the TF password module is in a wakeup state after the initialization is finished; if the terminal does not transmit any service to the TF password module in a time-out period of a sleep timer, the TF password module enters a dormant state; otherwise, the driver inquires a current state of the TF password module, and a wakeup operation and a state maintenance operation are executed in sequence if the TF password module is in the dormant state at present; and if the TF password module is in the wakeup state at present, the state maintenance operation is performed directly. The power management method is implemented on the basis of modification of the driver matched with the TF password module under the consideration of the requirements of an operating system without any special maintenance demand. The power management method is very suitable for a TF password module which has relatively high requirements on power consumption and password resource conservation.

Description

technical field [0001] The invention belongs to the field of embedded technology, and in particular relates to a power management method of a multi-task TF cryptographic module based on an Android intelligent operating system. Background technique [0002] The power management methods of existing TF business secret code cards are mainly divided into the following categories: [0003] (1) The bottom layer of the operating system sends instructions [0004] In this way, the Android power management function is registered in the underlying sdio / sd / mmc controller driver of the operating system, which accepts the unified management of the operating system. Send a sleep command, and send a wake-up command to the TF cryptographic module when it needs to be used. [0005] This method is limited by the dormancy wake-up mechanism of the operating system. When the user uses other functions of the terminal, the operating system will not be able to enter dormancy. Although the TF crypt...

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Problems solved by technology

[0011] This method has great limitations for multi-task calling of the TF cryptographic module at the application layer, and the status of the TF cryptographic module needs to be maintained between applications, which is not only difficult to implement, but also greatly reduces the efficiency

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