Mask intelligent card and function expanding method thereof

Abstract

The embodiment of the invention provides a mask intelligent card and a function expanding method thereof, relating to the field of intelligent cards and aiming at realizing the function expansion, i.e. program modification and upgrade and the like of the mask intelligent card. The mask intelligent card comprises a read-only storage, a random storage and a nonvolatile erasable storage, wherein theread-only storage stores a project file of the mask intelligent card; and the project file contains multiple performance functions. The function expanding method of the mask intelligent card comprises the following step that: a program of the read-only storage calls and stores a patch function of the nonvolatile erasable storage through a function call table stored in the nonvolatile erasable storage, wherein corresponding function call relationship defined by the function call table points to the patch function. The embodiment of the invention is used for the function expansion of the mask intelligent card.

Description

technical field [0001] The invention relates to the field of smart cards, in particular to a method for extending the function of a mask smart card and the smart card. Background technique [0002] With the popularity of smart cards, smart cards have been widely used in various fields of life such as mobile communications, e-commerce, and transportation. [0003] One type of smart card is a mask smart card, and its storage system includes: read only memory ROM, electrically erasable programmable read only memory EEPROM, and random access memory RAM. The ROM stores the operating system files of the smart card, the RAM stores the variable data of the operating system files, and the EEPROM stores the user's personal data, such as address book and short messages. Among them, EEPROM is a storage area that can be modified, and its storage space is generally above 100K. And because the CPU can directly access the address spaces of the EEPROM and the ROM, the program codes can be ...

AI Technical Summary

Problems solved by technology

[0005] However, the operating system file formed by the mask in the ROM cannot be modified. Once the mask is started, even if the smart card manufacturer finds that the operating system file is defective, it cannot be modified, resulting in the scrapping of smart cards in batches and bringing huge losses to the smart card manufacturer.

[0006] In addition, smart card manufacturers often need to upgrade or expand the functions of the smart card operating system files. Once the smart card starts masking, the smart card manufacturer cannot perform the upgrade process, which will bring great inconvenience to the production of smart card manufacturers.

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