CN105426239A - Method and device for invoking local method in Java card - Google Patents
Method and device for invoking local method in Java card Download PDFInfo
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- CN105426239A CN105426239A CN201510737905.1A CN201510737905A CN105426239A CN 105426239 A CN105426239 A CN 105426239A CN 201510737905 A CN201510737905 A CN 201510737905A CN 105426239 A CN105426239 A CN 105426239A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/48—Program initiating; Program switching, e.g. by interrupt
- G06F9/4806—Task transfer initiation or dispatching
- G06F9/4843—Task transfer initiation or dispatching by program, e.g. task dispatcher, supervisor, operating system
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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
The present invention relates to the command operating technical field in data handling system, particularly a kind of method and device realizing local method call in Java card.
Background technology
Java card is a kind of smart card that can run java applet.In Java card, often have application program, these application programs can be Java card when developing just stored in, also can add after Java card distribution, these application programs often can be modified on Java card.Each application program all can by firewall protection to safeguard its integrality and to prevent interference.
Java card in the course of the work, often needs to call various method.These methods such as can comprise nation method and common static method.Described nation method can be the method realized by C language, is the interactive interface of Java code and C language code.
At present, the flow process that Java card realizes local method call is similar with the flow process realizing normal static method call, and its step can be as described below:
First the mark that required for can obtaining from Java code area, the method called is corresponding, mark corresponding to the method is often made up of 2 bytes.After getting described mark, just can according to this mark, the required bag position of (package), method place of calling and the position of code are positioned.After navigating to the position of code, just can know the Method type that described method is corresponding from code.If the method type is nation method, then can take out the index of described nation method, described index often can be made up of 2 bytes.According to this index, just can inquire corresponding nation method, InvokeStatic instruction then just can be utilized to call.
In the practice of the invention, inventor finds prior art at least there are the following problems:
Can find from foregoing description, the step realizing local method call is at present very loaded down with trivial details, the mark that the method called required for needs basis is corresponding, carries out a series of position fixing process, then just can get index corresponding to the method, thus could calling the method be realized.This loaded down with trivial details invocation step will increase the performance cost of whole system undoubtedly, and the speed causing application program to be run is slack-off, brings bad experience to user.
Above it should be noted that, just conveniently to technical scheme of the present invention, clear, complete explanation is carried out to the introduction of technical background, and facilitate the understanding of those skilled in the art to set forth.Only can not think that technique scheme is conventionally known to one of skill in the art because these schemes have carried out setting forth in background technology part of the present invention.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of in Java card, realize local method call method and device, to simplify the step of local method call, ensures the quick operation of application program in Java card.
In order to reach the object of the invention, the invention provides a kind of method realizing local method call in Java card, comprising: in the order set of Java card, setting up InvokeNative instruction; Described Java card and application carry out code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding; When the described Method type analyzed is nation method, the call instruction of described nation method is revised as described InvokeNative instruction, and the index of described nation method is saved in described InvokeNative instruction.
Further, set up InvokeNative instruction in the described order set at Java card after, described method also comprises: be described InvokeNative command assignment unique identification.
Further, the Method type that the method for described analysis InvokeStatic instruction calls is corresponding specifically comprises: extract the first character joint in Java code area corresponding to the method for InvokeStatic instruction calls; According to the described first character joint extracted, judge the Method type that the method for described InvokeStatic instruction calls is corresponding.
Further, after being saved to by the index of described nation method in described InvokeNative instruction, described method also comprises: removed from Java code area by the code of described nation method.
Further, after being saved to by the index of described nation method in described InvokeNative instruction, described method also comprises: when described nation method is called by described InvokeNative instruction, the authority of examination & verification caller; According to the authority of examination & verification, determine whether described nation method can be called.
Further, the authority of described examination & verification caller specifically comprises: the bag mark extracting caller; The described bag mark extracted is identified with the bag prestored and compares, and determine the authority of described caller according to comparison result.
Further, described according to examination & verification authority, determine whether described nation method can be called and specifically comprise: when extract described bag mark be present in described in prestore bag mark in time, determine that described nation method can be called; When extract described bag mark be not present in described in prestore bag mark in time, determine that described nation method can not be called.
Present invention also offers a kind of device realizing local method call in Java card, comprising: unit is set up in instruction, for setting up InvokeNative instruction in the order set of Java card; Method type analytic unit, for carry out in described Java card and application code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding; Processing unit, for when the described Method type analyzed is nation method, is revised as described InvokeNative instruction by the call instruction of described nation method, and is saved in described InvokeNative instruction by the index of described nation method.
Further, described device also comprises: authentication unit, for when described nation method is called by described InvokeNative instruction, and the authority of examination & verification caller; Call determining unit, for the authority according to examination & verification, determine whether described nation method can be called.
Further, described authentication unit specifically comprises: bag marker extraction module, for extracting the bag mark of caller; Comparing module, compares for the described bag mark extracted being identified with the bag prestored, and determines the authority of described caller according to comparison result.
A kind of method and device realizing local method call in Java card that the embodiment of the present invention provides, by setting up the InvokeNative instruction being exclusively used in local method call, and the call instruction of nation method be revised as described InvokeNative instruction and the index of nation method be directly saved in described InvokeNative instruction, thus complicated position fixing process can be eliminated, greatly accelerate the process of local method call.Further, the authority of calling of nation method, also by the method for authentication, is limited in the inside bag of Java card, ensure that the security of local method call by the embodiment of the present invention.
With reference to explanation hereinafter and accompanying drawing, disclose in detail particular implementation of the present invention, specifying principle of the present invention can adopted mode.Should be appreciated that, thus embodiments of the present invention are not restricted in scope.In the spirit of claims and the scope of clause, embodiments of the present invention comprise many changes, amendment and are equal to.
The feature described for a kind of embodiment and/or illustrate can use in one or more other embodiment in same or similar mode, combined with the feature in other embodiment, or substitutes the feature in other embodiment.
Should emphasize, term " comprises/comprises " existence referring to feature, one integral piece, step or assembly when using herein, but does not get rid of the existence or additional of one or more further feature, one integral piece, step or assembly.
Accompanying drawing explanation
Accompanying drawing is used to provide the further understanding to technical solution of the present invention, and forms a part for instructions, is used from and explains technical scheme of the present invention, do not form the restriction to technical solution of the present invention with the embodiment one of the application.
A kind of method flow diagram realizing local method call in Java card that Fig. 1 provides for the embodiment of the present invention;
A kind of apparatus function module map realizing local method call in Java card that Fig. 2 provides for the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
Can perform in the computer system of such as one group of computer executable instructions in the step shown in the process flow diagram of accompanying drawing.Further, although show logical order in flow charts, in some cases, can be different from the step shown or described by order execution herein.
A kind of method flow diagram realizing local method call in Java card that Fig. 1 provides for the embodiment of the present invention.Although hereafter describe flow process to comprise the multiple operations occurred with particular order, but should have a clear understanding of, these processes can comprise more or less operation, and these operations can sequentially perform or executed in parallel (such as using parallel processor or multi-thread environment).As shown in Figure 1, described method can comprise:
S1: set up InvokeNative instruction in the order set of Java card.
In the order set of existing Java card, be identical for the instruction of calling nation method with the instruction of calling static method, be InvokeStatic.Utilize InvokeStatic instruction to realize local method call and need the position fixing process that experience is complicated.Therefore, in embodiments of the present invention, can set up InvokeNative instruction in the order set of Java card, this InvokeNative instruction is specifically designed to and realizes calling of nation method.It should be noted that, the title of InvokeNative instruction herein can also be changed to other instruction name do not occurred in the order set of Java card, the present invention does not limit the title that this is specifically designed to the instruction realizing local method call, InvokeNative just one of them instruction name adopted for convenience.
Set up InvokeNative instruction in the order set of Java card after, conveniently managing this instruction and this instruction and other instruction distinguished mutually, in a preferred embodiment, can be described InvokeNative command assignment unique identification.Described unique identification can as the instruction code of described InvokeNative instruction, and such as in a particular application, this unique identification can be 185.Certainly, this unique identification can also be other not used instruction code.Similarly, the embodiment of the present invention does not add restriction to described uniquely identified concrete manifestation form, and it can be unique digital code, equally also can be unique character string code.
S2: described Java card and application carry out code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding.
Set up the InvokeNative instruction being specifically designed to and realizing local method call in the order set of Java card after, due to the stereotyped command that this InvokeNative instruction is not in Java system, but the instruction of later stage expansion, the existence of this instruction is not known in the application in Java card.Therefore, the embodiment of the present invention needs the index of the nation method that the InvokeNative command assignment for setting up is concrete, and InvokeNative instruction can be made normally must to be used by the application in Java card.Particularly, the embodiment of the present invention can described Java card and application carry out code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding.Implement in scene concrete, an application is downloaded to often on Java card and is performed.Application often can be downloaded on described Java card by two kinds of approach, and one connects transformation applications outward by Java card, application is preset in the ROM of Java card by the method for mask.In this method, it is to carry out in the outside of Java card that described Java card and application carry out that code is connected.Another kind downloads in EEPROM by application, and in this method, described Java card and application are carried out code and be connected and carry out in Java card.
No matter be which kind of download path, when application enters in Java card, all need to carry out code with Java card and be connected, the application that such guarantee is downloaded normally can run on Java card.Described Java card and application carry out code be connected time, can process InvokeStatic instruction, be common static method or nation method with what distinguish that it calls.Particularly, in a preferred embodiment, the first character joint in Java code area corresponding to the method for InvokeStatic instruction calls can be extracted.InvokeStatic instruction, when call method, often first obtains the mark of the method, then relocates out code position corresponding to the method according to this mark.First character in the Java code area that the method is corresponding saves the Method type can recorded belonging to the method, and described Method type can be such as nation method or common static method.The embodiment of the present invention just can save according to this first character, judge the Method type that the method for described InvokeStatic instruction calls is corresponding after extracting described first character joint.Like this, carry out in application and Java card the stage that code is connected, just can determine that the method for InvokeStatic instruction calls is nation method or common static method.
S3: when the described Method type analyzed is nation method, the call instruction of described nation method is revised as described InvokeNative instruction, and the index of described nation method is saved in described InvokeNative instruction.
The embodiment of the present invention, after judging the method for InvokeStatic instruction calls, can be further processed the situation that Method type is nation method.Particularly, when the described Method type analyzed is nation method, the call instruction of described nation method can be revised as described InvokeNative instruction, and the index of described nation method is saved in described InvokeNative instruction.Because the call instruction given tacit consent to for nation method in Java system is InvokeStatic instruction, so the present invention is after analysis draws nation method, the call instruction that this nation method is given tacit consent to can be revised as InvokeNative instruction.Like this, when needs call nation method, InvokeNative instruction just can be directly utilized to call.
In embodiments of the present invention, when InvokeNative instruction calls nation method, in order to avoid there is a series of position fixing process, can directly the index of described nation method be saved in described InvokeNative instruction, like this after InvokeNative instruction gets the mark of nation method, directly can take out the index of associated from code area according to this mark, just directly can jump to the implementation of corresponding nation method according to this index taken out, thus avoid complicated position fixing process.
In a preferred embodiment, the call instruction of nation method is being revised as described InvokeNative instruction, and after the index of described nation method being saved in described InvokeNative instruction, the code of described nation method can be removed from Java code area, to avoid carrying out repeated storage to the code of nation method, thus the code size of whole system can be reduced.
In another preferred embodiment of the present invention, in order to ensure that nation method is not directly called by illegal assailant, described nation method can be worked as when being called by described InvokeNative instruction, the authority of examination & verification caller.Particularly, the embodiment of the present invention can the bag (package) at query calls person place, and extracts the bag mark of described caller.Described bag mark can with each bag one_to_one corresponding in Java system, to distinguish the difference between different bag.Bag associated with it can be determined uniquely by bag mark.After extracting the bag mark of caller, just the described bag mark extracted can be identified with the bag prestored and compare.The described bag mark prestored can be when Java card dispatches from the factory in this Java card of typing, multiple bag mark can be there is in the described bag mark prestored, the Bao Jun of these bag mark correspondences is legal, and the caller come from these legal bags is also correspondingly legal.Like this, just can be identified by the bag that caller is corresponding, thus distinguish that whether the identity of caller is legal.The described bag mark extracted by comparison is identified with the bag prestored, thus can determine the authority of described caller.Particularly, when described extraction described bag mark be present in described in prestore bag mark in time, just can think that it is legal for identifying corresponding caller with this bag, possesses the authority called, thus can determine that described nation method can be called; On the contrary, when extract described bag mark be not present in described in prestore bag mark in time, then can determine that described nation method can not be called.By identifying the identity of caller, thus the authority of caller can be determined, to ensure that the authority of calling of nation method is limited in the inside bag of Java card, avoiding outside illegal assailant and directly calling nation method.
Can find from above-mentioned statement, a kind of method realizing local method call in Java card that the embodiment of the present invention provides, by setting up the InvokeNative instruction being exclusively used in local method call, and the call instruction of nation method be revised as described InvokeNative instruction and the index of nation method be directly saved in described InvokeNative instruction, thus complicated position fixing process can be eliminated, greatly accelerate the process of local method call.Further, the authority of calling of nation method, also by the method for authentication, is limited in the inside bag of Java card, ensure that the security of local method call by the embodiment of the present invention.
The embodiment of the present invention also provides a kind of device realizing local method call in Java card.A kind of apparatus function module map realizing local method call in Java card that Fig. 2 provides for the embodiment of the present invention.As shown in Figure 2, described device can comprise:
Unit 100 is set up in instruction, for setting up InvokeNative instruction in the order set of Java card;
Method type analytic unit 200, for carry out in described Java card and application code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding;
Processing unit 300, for when the described Method type analyzed is nation method, is revised as described InvokeNative instruction by the call instruction of described nation method, and is saved in described InvokeNative instruction by the index of described nation method.
In a preferred embodiment, after unit 100 is set up in described instruction, described device can also comprise:
Mark allocation units, for being described InvokeNative command assignment unique identification.
In another preferred embodiment of the present invention, described Method type analytic unit 200 specifically can comprise:
Byte-extraction module, the first character joint in the Java code area that the method for extracting InvokeStatic instruction calls is corresponding;
Type judging module, for according to the described first character joint extracted, judges the Method type that the method for described InvokeStatic instruction calls is corresponding.
In another preferred embodiment of the present invention, after described processing unit 300, described device can also comprise:
Code removal unit, for removing the code of described nation method from Java code area.
In another preferred embodiment of the present invention, in order to ensure the security of local method call, after described processing unit 300, described device can also comprise:
Authentication unit, for when described nation method is called by described InvokeNative instruction, the authority of examination & verification caller;
Call determining unit, for the authority according to examination & verification, determine whether described nation method can be called.
Wherein, described authentication unit specifically can comprise:
Bag marker extraction module, for extracting the bag mark of caller;
Comparing module, compares for the described bag mark extracted being identified with the bag prestored, and determines the authority of described caller according to comparison result.
The specific implementation of each functional module above-mentioned is identical with the method flow in step S1 to S3, just repeats no more here.
A kind of method and device realizing local method call in Java card that the embodiment of the present invention provides, by setting up the InvokeNative instruction being exclusively used in local method call, and the call instruction of nation method be revised as described InvokeNative instruction and the index of nation method be directly saved in described InvokeNative instruction, thus complicated position fixing process can be eliminated, greatly accelerate the process of local method call.Further, the authority of calling of nation method, also by the method for authentication, is limited in the inside bag of Java card, ensure that the security of local method call by the embodiment of the present invention.
With the object described, those skilled in the art are supplied to the description of various embodiment of the present invention above.It is not intended to is exhaustive or is not intended to the present invention to be limited to single disclosed embodiment.As mentioned above, of the present invention various substitute and change will be apparent for above-mentioned technology one of ordinary skill in the art.Therefore, although specifically discuss the embodiment of some alternatives, other embodiment will be apparent, or those skilled in the art relatively easily draw.The present invention is intended to be included in that of the present invention all that this had discussed substitute, amendment and change, and drops on other embodiment in the spirit and scope of above-mentioned application.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually see, what each embodiment stressed is the difference with other embodiments.Especially, for system embodiment, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part illustrates see the part of embodiment of the method.
Claims (10)
1. in Java card, realize a method for local method call, it is characterized in that, comprising:
InvokeNative instruction is set up in the order set of Java card;
Described Java card and application carry out code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding;
When the described Method type analyzed is nation method, the call instruction of described nation method is revised as described InvokeNative instruction, and the index of described nation method is saved in described InvokeNative instruction.
2. a kind of method realizing local method call in Java card as claimed in claim 1, it is characterized in that, set up InvokeNative instruction in the described order set at Java card after, described method also comprises:
For described InvokeNative command assignment unique identification.
3. a kind of method realizing local method call in Java card as claimed in claim 1, is characterized in that, the Method type that the method for described analysis InvokeStatic instruction calls is corresponding specifically comprises:
Extract the first character joint in Java code area corresponding to the method for InvokeStatic instruction calls;
According to the described first character joint extracted, judge the Method type that the method for described InvokeStatic instruction calls is corresponding.
4. a kind of method realizing local method call in Java card as claimed in claim 1, it is characterized in that, after being saved to by the index of described nation method in described InvokeNative instruction, described method also comprises:
The code of described nation method is removed from Java code area.
5. a kind of method realizing local method call in Java card as claimed in claim 1, it is characterized in that, after being saved to by the index of described nation method in described InvokeNative instruction, described method also comprises:
When described nation method is called by described InvokeNative instruction, the authority of examination & verification caller;
According to the authority of examination & verification, determine whether described nation method can be called.
6. a kind of method realizing local method call in Java card as claimed in claim 5, it is characterized in that, the authority of described examination & verification caller specifically comprises:
Extract the bag mark of caller;
The described bag mark extracted is identified with the bag prestored and compares, and determine the authority of described caller according to comparison result.
7. a kind of method realizing local method call in Java card as claimed in claim 6, is characterized in that, the described authority according to examination & verification, determines whether described nation method can be called and specifically comprises:
When extract described bag mark be present in described in prestore bag mark in time, determine that described nation method can be called;
When extract described bag mark be not present in described in prestore bag mark in time, determine that described nation method can not be called.
8. in Java card, realize a device for local method call, it is characterized in that, comprising:
Unit is set up in instruction, for setting up InvokeNative instruction in the order set of Java card;
Method type analytic unit, for carry out in described Java card and application code be connected time, analyze the Method type that the method for InvokeStatic instruction calls is corresponding;
Processing unit, for when the described Method type analyzed is nation method, is revised as described InvokeNative instruction by the call instruction of described nation method, and is saved in described InvokeNative instruction by the index of described nation method.
9. a kind of device realizing local method call in Java card as claimed in claim 8, it is characterized in that, described device also comprises:
Authentication unit, for when described nation method is called by described InvokeNative instruction, the authority of examination & verification caller;
Call determining unit, for the authority according to examination & verification, determine whether described nation method can be called.
10. a kind of device realizing local method call in Java card as claimed in claim 9, it is characterized in that, described authentication unit specifically comprises:
Bag marker extraction module, for extracting the bag mark of caller;
Comparing module, compares for the described bag mark extracted being identified with the bag prestored, and determines the authority of described caller according to comparison result.
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| CN201510737905.1A CN105426239A (en) | 2015-11-03 | 2015-11-03 | Method and device for invoking local method in Java card |
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| CN201510737905.1A CN105426239A (en) | 2015-11-03 | 2015-11-03 | Method and device for invoking local method in Java card |
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