What are the limits it in code that is running in a SIO

Hello

I wonder if any of you good people out there can tell me if there are limits on what the code can be executed (or accessed memory) by a method of object of shareable Interface (SIO) server-side?

I have a server applet that implements a SIO which includes a single method - IncNumber(). It simply increments a field on a single byte which is one of the many areas in an array of nonvolatile memory. BUT before the number can be incremented IncNumber() must verify a seal THAT protects the entire table. If the seal is OK then the field can be incremented and a new seal is created the entire table. The server cmdlet has an APDU that calls IncNumber and I can make these units APDU to my heart's content and see incrementing number always protected by properly trained seals. So when running the applet Server everything works fine.

The problem comes when I create a Client applet which tries to call the Principal agent. IncNumber() method, because it always returns an error 6F00. I found that the problem comes when the applet Server runs the following command (in trying to check the certificate FOR):

cipherDES.init (keyTest [0], Cipher.MODE_ENCRYPT);

cipherDES is declared in a non-volatile memory and is initialized in the constructor of the server. keyTest is an array of possible keys (also resident in non-volatile memory), but for the moment only [0] is already used. The server must go through an initialization phase which initializes keyTest [0] so I'm fairly certain that all objects exist. Don't forget that I can issue an APDU to the server cmdlet that runs this code yourself without problem.

My understanding of the functioning of the WIS system is that when the customer calls that the SIO customer method gets hunted in memory to be replaced by the server, as if the server had been selected himself, so I don't see why it will fail on this line of code. This interpretation is correct?

So my QUESTION is this. He knows that this will not work? If so, can you please explain why and give me ideas on how I could get around it (if possible). If you think that this should can work you give me ideas why it isn't (or things that I could try to find out). Would it be a limitation on the card that I use (AFAIK, the map I use this on is a map of NXP JCop 2.4.1 running Javacard 2.2.2 and global platform 2.1.1)?

Any ideas gratefully will welcome.

Hello

The problem is with the creation of the object of encryption. You must define externalAccess to true in the call to getInstance(). The javadoc says:

externalAccess true indicates that the instance will be shared between applet multiple instances and that the instance of the encryption algorithm is also available (via a shared interface) when the owner of the instance of the encryption algorithm is not the currently selected applet. If true the implementation doesn't have to allocate internal data CLEAR_ON_DESELECT transitional space.

In addition, when the main agent is called, the caller is not deleted from the memory, there is a change of context internally in the JCRE. The SIO server may not necessarily be currently selected. It is covered in a bit more detail in the JCRE plug.

Shane

Tags: Java

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