CN103309696B - Method and device for updating Java card extended library, and Java card - Google Patents

Abstract

The invention discloses a method for updating a Java card extended library. The method comprises the following steps: A, obtaining a reference relationship between an extended library to be updated and an application and/or embodiment and/or a second extended library; obtaining a first mapping relationship of all methods and memory addresses thereof in the extended library to be updated; B, updating the extended library, and establishing a second mapping relationship between all the methods in the extended library after being updated and memory addresses thereof according to the memory state of the extended library after being updated; C, updating the corresponding information of the memory addresses aiming at the methods in the extended library in the application and/or embodiment and/or extended library according to the reference relationship and the second mapping relationship. According to the method, the files of the extended library in the Java card can be updated under the condition that the application and embodiment are not deleted. Moreover, the invention also discloses a device for updating the Java card extended library, and a Java card.

Description

A Java card expansion library update method, device and Java card

technical field

The invention relates to a method for updating a Java Card extension library, which belongs to the field of data business.

Background technique

Java Card is an open standard developed by Sun Corporation for the smart card development platform. Smart cards created using the Java Card platform have Java applets stored on them. It is also possible to add applets to the card or modify existing applets on the card after the card is issued. They store data in an integrated microprocessor chip. The applet is then downloaded into the microprocessor's memory and run by the Java virtual machine. Similar to MULTOS, another smart card development technology, Java Card enables multiple applications to be installed and coexist independently. Each applet is protected by a firewall to maintain its integrity and prevent interference. Applications can be dynamically upgraded.

As shown in Figure 1, the Java Card contains the Standard Library and the Extensional Library. The application (Applet) creates one or more instances (Instance) by referring to the API (Application Programming Interface) interface provided by the callable library. , wherein, Fig. 2 shows a composition diagram of a standard Java card, which includes: card hardware (SMART CARD HW AND NATIVE SYSTEM), Java card virtual machine (Java CardVM BYTECODE INTERETER), local method (NATIVE METHOD), system Library (SYSTEM CLASSES), installation manager (INSTALLER), standard Java card API (FRAMEWORK CLASSES APIS), extension library (INDUSTRYSPECIFIC EXTENSIONS), among them, generally, there are applet management, transaction management, I/O network communication in the system library As well as other services, in general, the Java Card API specifies a special subset of the Java language for smart cards, and due to the use of the Java virtual machine, the above applets can be run across platforms.

Among them, the Java virtual machine realizes the unification of the card interface and the unification of the programming language. Among them, the API interface is mainly responsible for executing the Java card applet and providing the environment required for applet execution. Among them, the extension library is the class provided by the server, so that the enterprise And companies can provide their own service programs, these classes are referred to as methods in this application, and there are corresponding addresses in the Java Card; and the Java Card applet is the application developed, wherein each applet and the extended library The methods in have a certain reference relationship, and the above applet executes the related methods by referring to the address information of the method. Among them, the execution environment of the Java Card does not support multi-threading, so only one Applet can be executed at a time, and each applet There are firewalls blocking.

At present, if you want to update the extended library in Java Card, you must first delete the instances and applications that reference it. As shown in Figure 3, if you want to update the extension library, you must first delete the instance (Instance), then delete Applet2, Applet3, and then delete the extension library; reinstall the extension library, install Applet2, Applet3, and install Instance.

Among them, during the installation process of the library, a reference relationship table needs to be set to convert the name of the library into a reference item, and convert the method into an actual calling address; when the Java program updates the library, it needs to delete the contents of the corresponding table item.

From the above description, it can be found that the problems in the prior art:

1) To update the extension library, you must first delete the instance, application/extension library that references the extension library;

2) To delete an instance, you must first back up (move out) the instance data, and then restore (move in) the instance data after reinstalling the instance; when the extended library is referenced by a large number of applications and instances, this operation will become extremely cumbersome. Not even executable.

Contents of the invention

The technical problem to be solved by the present invention is that it is not necessary to delete instances and applications referencing it when updating the extended library, and the method will not cause Java cards to work abnormally due to updating the extended library.

Wherein, according to an object of the present invention, the present invention provides a kind of Java card extension storehouse update method, comprising:

A. Obtain the reference relationship between the extension library to be updated and the application and/or instance and/or the second extension library; obtain the first mapping relationship between all methods in the extension library to be updated and their storage addresses;

B. Update the extended library, and establish a second mapping relationship between all methods in the updated extended library and their storage addresses according to the storage state of the updated extended library;

C. According to the reference relationship and the second mapping relationship, update the storage address information corresponding to the method in the extension library in the above application and/or instance and/or extension library.

Wherein, preferably, in step A, further comprising: disabling the running of the above-mentioned application and/or instance and/or the second extension library in the Java card.

Wherein, preferably, the application and/or instance and/or the second extension library directly or indirectly references one or more methods in the extension library, wherein the application and/or instance and/or the second extension library The extension library executes the corresponding method by referring to the storage address information of the method.

Wherein, preferably, in step A, specifically include:

Traversing all applications, extension libraries and instances on the Java card with the first extension library as the root, obtaining and saving the reference relationship between the application, the second extension library and instances and the extension library;

The first mapping relationship between the methods in the first extension library and their storage addresses is obtained according to the storage information of the first extension library.

Wherein, preferably, in step C, specifically include:

Obtain all applications, extension libraries and instances that refer to the first extension library according to the reference relationship; modify the old physical addresses of the methods referenced in the applications, extension libraries and instances to new ones according to the second mapping relationship , and modify the state of these applications, extension libraries, and instances to the enabled state.

Among them, preferably, further include:

Checking the corresponding relationship between the application and/or the instance and/or the corresponding method in the second extension library and the updated method in the first extension library;

Wherein, when there is no corresponding method in the updated first extension library, an alarm message is issued to prompt that the update of the Java extension library fails.

Wherein, preferably, in step C, after the update of the above-mentioned storage address information is completed, it further includes:

The application and/or instance and/or the second extension library executes the corresponding application and/or instance and/or the second extension library in the Java card according to the updated address information.

This application replaces the old address information of the corresponding method through the reference relationship of the above methods, so that the updated extension library can be referenced by the original application and/or instance and/or other extension libraries. This method overcomes the The disadvantage of the existing technology that the extended library can be updated only by deleting old applications, instances and extended libraries has a good technical effect.

In addition, the present invention also provides a kind of expansion library updating device in Java card, comprising:

An association relationship management unit, configured to obtain a reference relationship between the first extension library to be updated and the application and/or instance and/or the second extension library;

An address relationship acquiring unit, configured to acquire a first mapping relationship between methods in the first extended library and their storage addresses;

An extension library installation unit, used to delete the old first extension library and install a new first extension library;

The address relationship obtaining unit is further configured to establish a second mapping relationship between the methods in the updated first extended library and their storage addresses according to the storage information of the updated first extended library;

The address information updating unit is configured to update the storage address information in the application and/or instance and/or the second extension library corresponding to the method in the first extension library according to the reference relationship and the second mapping relationship.

Wherein, preferably, it further includes: a state management unit, configured to disable or start the operation of the above-mentioned application and/or instance and/or the second extension library.

Wherein, preferably, the application and/or instance and/or the second extension library directly or indirectly references one or more methods in the first extension library.

Wherein, preferably, it further includes: an application method address management unit, configured to save the storage address information of the application and/or instance and/or the second extension library containing the one or more methods.

Among them, preferably, also include:

A correspondence detection unit, configured to check the correspondence between the application and/or instance and/or the corresponding method in the second extension library and the updated method in the first extension library;

The information alarm unit is configured to issue an alarm message prompting that the update of the Java extension library fails when there is no corresponding method in the updated first extension library.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings, so as to make the above-mentioned advantages of the present invention clearer.

Fig. 1 is the schematic diagram of a Java card in the prior art;

Fig. 2 is a structural representation of a Java Card in the prior art

Fig. 3 is the update schematic diagram of the extension library in a Java card in the prior art;

Fig. 4 is the schematic flow chart of the extension library updating method in the Java card of the present invention

Fig. 5 is a schematic flow chart of the update method of the extended library in the Java card of an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of an updating device for an extension library in a Java Card in an embodiment of the present invention.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Method embodiment one:

Fig. 4 is the schematic flow chart of the extension library updating method in the Java card of the present invention;

As shown in Figure 4, the method for updating the extended library in the Java card mainly includes:

S101: Obtain the reference relationship between the extended library to be updated and the application and/or instance and/or the second extended library; including: traversing all applications, extended libraries and instances on the Java card with the first extended library as the root, obtaining and saving The reference relationship between the application, the second extension library and the instance, and the extension library;

S102: Obtain the first mapping relationship between all the methods in the extended library to be updated and their storage addresses; including: obtaining the first mapping between the methods in the first extended library and their storage addresses according to the storage information of the extended library relation.

S103: updating the extended library,

Including: deleting the old extension library and replacing the old extension library with a new extension library, wherein the new extension library has all the methods of the old extension library;

S104: Establish a second mapping relationship between all methods in the updated extended library and their storage addresses according to the storage state of the updated extended library;

S105: According to the reference relationship and the second mapping relationship, update the storage address information corresponding to the method in the extension library in the above application and/or instance and/or extension library.

Among them, the present application replaces the old address information of the corresponding method through the reference relationship of the above methods, so that the updated extension library can be referenced by the original application and/or instance and/or other extension libraries. The method overcomes the disadvantage of the prior art that the old application, instance and extension library must be deleted before the extension library can be updated, and has a good technical effect.

Wherein, it can be understood that, before S101, it is necessary to disable the running of the above-mentioned application and/or instance and/or the second extension library in the Java card, so as to obtain and save the above-mentioned reference relationship and/or address and method Correspondence between.

Wherein the application and/or instance and/or the second extension library directly or indirectly references one or more methods in the extension library, wherein the application and/or example and/or the second extension library refer to the Execute the corresponding method according to the storage address information of the above method.

Among them, S105 specifically includes:

Obtain all applications, extension libraries and instances that refer to the first extension library according to the reference relationship; modify the old physical addresses of the methods referenced in the applications, extension libraries and instances to new ones according to the second mapping relationship , and modify the state of these applications, extension libraries, and instances to the enabled state.

In addition, in order to reduce the frequency of errors as much as possible, after the update is completed or before the update, it is necessary to check the relationship between the corresponding method in the application and/or instance and/or the second extension library and the updated method in the first extension library corresponding relationship;

Wherein, when there is no corresponding method in the updated first extension library, an alarm message is issued to prompt that the update of the Java extension library fails.

And, after the modification of the above-mentioned storage address information is completed, the application and/or instance and/or the second extension library performs corresponding application and/or instance and/or the second extension library in the Java card according to the updated address information. running.

Wherein, after the present invention adopts the above-mentioned update method, it is not necessary to delete the instances and applications referencing it when updating the extended library; moreover, this invention will not cause the Java card to work abnormally due to the updated extended library, which has very good technical advantages .

Method embodiment two:

Wherein, the present invention is described in detail in combination with more specific embodiments; FIG. 5 is a schematic flowchart of a method for updating an extension library in a Java Card according to an embodiment of the present invention.

Wherein, the method includes two main steps, wherein, S101-S102 mainly relate to the operation before updating the extension library, specifically as follows:

Modify status: Check all applications, extension libraries and instances on the card that take the extension library as the root, and modify the status of these applications, extension libraries and instances to disabled status;

That is, S1011: save the reference relationship between the methods in the library and the actual address of the library, that is, which applications and extension libraries refer to the extension library, and put the above information into a reference relationship table;

S1022: Save the method of the extended library and the mapping relationship table of the old real address, that is, a corresponding relationship of method-addressold; delete the extended library.

Among them, the so-called atomic operation means that the above operations are either all executed successfully, or not executed, and there will be no situation where half of the execution cannot be recovered, the same below.

Steps S103-S105 involve the main steps of updating the extended library, wherein, in a specific embodiment, the following atomic operations are mainly performed:

Install the extension library;

Form the mapping relationship table between the method in the extended library and the new real address, namely: method—address new;

According to the previously saved reference relationship table, traverse all applications and extension libraries that reference the extension library, and change addressold to address new;

Change the status of these apps, extensions, and instances to enabled.

Among them, it is also understandable that in order to avoid updating or deleting the methods called by the original application and the extended library due to updating the library, a check operation must be performed before installing the library. If the above situation occurs, it will prompt that the update fails.

Among them, this case improves the update method of the library of the Java card without deleting too many applications and personal data. It solves the mechanism of updating the library in the existing Java program. For specific scenarios, it has very good advantages.

Device embodiment one:

Among them, the present invention also discloses a Java card, which includes one or more extended libraries and applications and/or examples, and is also provided with an extended library update device, because the Java card can be updated without deleting the application. One or more extension libraries for .

Wherein, Fig. 6 is a schematic structural diagram of an updating device for an extended library in a Java card in an embodiment of the present invention;

As shown in Figure 6, the update device specifically includes:

An association relationship management unit, configured to obtain a reference relationship between the first extension library to be updated and the application and/or instance and/or the second extension library;

An address relationship acquiring unit, configured to acquire a first mapping relationship between methods in the first extended library and their storage addresses;

An extension library installation unit, used to delete the old first extension library and install a new first extension library;

The address relationship obtaining unit is further configured to establish a second mapping relationship between the methods in the updated first extended library and their storage addresses according to the storage information of the updated first extended library;

The address information updating unit is configured to update the storage address information in the application and/or instance and/or the second extension library corresponding to the method in the first extension library according to the reference relationship and the second mapping relationship.

Wherein, it also includes: a state management unit, configured to disable or start the operation of the above-mentioned application and/or instance and/or the second extension library.

Wherein, the application and/or instance and/or the second extension library directly or indirectly references one or more methods in the first extension library.

Wherein, it further includes: an application method address management unit, configured to save the storage address information of the application and/or instance and/or the second extension library containing the one or more methods.

Among them, also include:

A correspondence detection unit, configured to check the correspondence between the application and/or instance and/or the corresponding method in the second extension library and the updated method in the first extension library;

The information alarm unit is configured to issue an alarm message prompting that the update of the Java extension library fails when there is no corresponding method in the updated first extension library.

Among them, after the present invention adopts the above-mentioned update device, it does not need to delete the instances and applications that refer to it when updating the extended library; and this invention will not cause the Java card to work abnormally due to the updated extended library, which has good technical advantages .

Wherein, those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, , performing the steps comprising the above-mentioned method embodiment; and the aforementioned storage medium includes: a read-only memory (Read Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), a magnetic disk, a terminal mobile phone software or an optical disk Various media that can store program codes.

Finally, it should be noted that: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it still The technical solutions recorded in the foregoing embodiments may be modified, or some technical features thereof may be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (13)

1. a kind of Java card expanding library update method, including：

A, acquisition the first expanding library to be updated and the adduction relationship of application and/or example and/or the second expanding library；Obtain described All methods in the first expanding library to be updated and the first mapping relations of its storage address；

B, described first expanding library of renewal, set up the first extension after updating according to the storage state of the first expanding library after updating The second mapping relations between all methods in storehouse and its storage address；

C, according to described adduction relationship and the second mapping relations, update pin in above-mentioned application and/or example and/or the second expanding library To the storage address information corresponding to the method in described first expanding library.

2. Java card expanding library update method according to claim 1, in step, also includes：Disable above-mentioned application And/or the operation in described Java card of example and/or the second expanding library.

3. Java card expanding library update method according to claim 1 and 2 is it is characterised in that described application and/or example And/or second expanding library directly or indirectly quote one of described first expanding library or multiple method, wherein, described should With and/or example and/or the second expanding library corresponding method is executed by the storage address information quoting methods described.

4. Java card expanding library update method according to claim 1 is it is characterised in that in step A, specifically include：

All applications with the first expanding library as root, the second expanding library and example on traversal Java card, obtain and preserve described answering With the adduction relationship between, the second expanding library and example and described first expanding library；

Storage information according to the first expanding library obtains the first mapping between method and its storage address in the first expanding library Relation.

5. Java card expanding library update method according to claim 1 is it is characterised in that in step C, specifically include：

Obtain all applications, the second expanding library and the example quoting described first expanding library according to described adduction relationship；

According to described second mapping relations by the old physical address of the method quoted in described application, the second expanding library and example It is revised as new physical address, these are applied, the status modifier of the second expanding library and example is to enable state simultaneously.

6. Java card expanding library update method according to claim 1 is it is characterised in that further comprise：

Check application and/or example and/or the second expanding library in corresponding method and update after the first expanding library in method Between corresponding relation；

Wherein, when there is not corresponding method in the first expanding library after described renewal, send prompting Java expanding library more The warning message of new failure.

7. Java card expanding library update method according to claim 6 is it is characterised in that in above-mentioned storage address information more After the completion of new, also include：

Described application and/or example and/or the second expanding library according to the address information after updating, carry out corresponding application and/or The operation in Java card of example and/or the second expanding library.

8. a kind of Java card expanding library updating device, including：

Incidence relation administrative unit, for obtaining the first expanding library to be updated and application and/or example and/or the second expanding library Adduction relationship；

Address relationship acquiring unit, closes for obtaining the first mapping between the method in the first expanding library and its storage address System；

Expanding library installation unit, for deleting the first old expanding library and installing the first new expanding library；

Described address relationship acquiring unit, is additionally operable to set up the after updating according to the storage information of the first expanding library after updating The second mapping relations between method in one expanding library and its storage address；

Address information updating block, for according to described adduction relationship and the second mapping relations, updating above-mentioned application and/or example And/or second in expanding library for the storage address information corresponding to method in described first expanding library.

9. Java card expanding library updating device according to claim 8 is it is characterised in that also include：State managing unit, For disabling or starting the operation of above-mentioned application and/or example and/or the second expanding library.

10. Java card expanding library updating device according to claim 9 is it is characterised in that described application and/or example And/or second expanding library directly or indirectly quote one of described first expanding library or multiple method.

11. Java card expanding library updating devices according to claim 10 are it is characterised in that also include：Application process ground Location administrative unit, includes one or more of sides for preserving in described application and/or example and/or the second expanding library The storage address information of method.

12. Java card expanding library updating devices according to claim 10 are it is characterised in that also include：

Corresponding relation detector unit, after corresponding method in inspection application and/or example and/or the second expanding library and renewal The first expanding library in method between corresponding relation；

Information alert unit, for when there is not corresponding method in the first expanding library after described renewal, sending prompting Java expanding library updates the warning message of failure.

A kind of 13. Java card, want it is characterised in that being additionally provided with right including one or more expanding libraries and application and/or example Seek 8～12 arbitrary described expanding library updating devices.