Method and device for invoking local method in Java card

Abstract

The invention provides a method and device for invoking a local method in a Java card, wherein the method comprises the following steps: additionally arranging an Invoke Native instruction in an instruction system of the Java card; analyzing the type of the method corresponding to a method for invoking an Invoke Static instruction when code connection between the Java card and an application is carried out; and, when the analyzed type of the method is the local method, modifying a local method invoking instruction into the Invoke Native instruction, and storing a local method index in the Invoke Native instruction. According to the method and device for invoking the local method in the Java card provided in the embodiment of the invention, the step of invoking the local method can be simplified; rapid running of an application program in the Java card can be ensured; furthermore, the local method invoking permission is limited in an internal packet of the Java card through a permission check method; and thus, the local method invoking safety can be ensured.

Description

technical field [0001] The invention relates to the technical field of instruction operation in a data processing system, in particular to a method and a device for realizing local method calling in a Java card. Background technique [0002] A Java Card is a smart card that can run Java programs. There are often application programs in the Java card. These application programs can be stored in the Java card when it is developed, or can be added after the Java card is issued. These application programs can often be modified on the Java card. Each application can be firewalled to maintain its integrity and prevent interference. [0003] When Java is stuck in the working process, it often needs to call various methods. These methods may include, for example, native methods as well as ordinary static methods. The local method may be a method implemented in C language, and is an interactive interface between Java code and C language code. [0004] At present, the Java Card im...

AI Technical Summary

Problems solved by technology

[0007] From the above description, it can be found that the current steps to implement local method calls are very cumbersome, and a series of positioning processes need to be performed according to the identification corresponding to the method to be called, and then the index corresponding to the method can be obtained, so as to realize the local method call. method call

Such cumbersome calling steps will undoubtedly increase the performance overhead of the entire system, resulting in slower running speed of the application and bringing a bad experience to the user.

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