Can I manage APDU by myself if i use RMI model?

Question

Javacard - RMI , Can I manage APDU command by myself?
First , there are 3 model of "Communicating with a Java Card Applet (Accessing the Smart Card)"
1. The Message-Passing Model
2. The Java Card RMI (JCRMI)
3. The Security and Trust Services API (SATSA)
This is my thinking/understanding
I have seen that no manage APDU in RMIDemo. It look like programmer no need to manage APDU by themselves. RMI will manage it.
(package com.sun.javacard.samples.RMIDemo; - > demo from java_card_kit-2_2_1)
but another way -> "The Message-Passing Model" in JavaPurse ,wallet demo. all of these can manage APDU directly.
Well, I want to know , Can I manage APDU by myself if i use RMI model?

Answer 1

Javacard - RMI , Can I manage APDU command by myself?
First , there are 3 model of "Communicating with a
Java Card Applet (Accessing the Smart Card)"
1. The Message-Passing Model
2. The Java Card RMI (JCRMI)
3. The Security and Trust Services API (SATSA) The last one is AFAIK not a separate model. SATSA uses APDU or JC-RMI to communicate with a java- / smartcard.
This is my thinking/understanding
I have seen that no manage APDU in RMIDemo. It look
like programmer no need to manage APDU by themselves.
RMI will manage it.
(package com.sun.javacard.samples.RMIDemo; - > demo
from java_card_kit-2_2_1)
but another way -> "The Message-Passing Model" in
JavaPurse ,wallet demo. all of these can manage APDU
directly.
Well, I want to know , Can I manage APDU by myself if
i use RMI model?Yes you can.
If you look into the PurseApplet.java you will notice in the process() method, that all APDUs your applet receives have to be passed to the RMI Service manually: disp.process(APDU);
What you do with the APDU before passing it to the dispatcher (or after it) is up to you. You only have to make sure that you do not use the same INS value for your custom commands.
By default the RMIService uses RmiService.DEFAULT_RMI_INVOKE_INSTRUCTION = 0x38 as INS value.
Jan