JavaCard OS

I have a written a java applet to send APDU command to my java card. When I am sending Init_Auth command(80500000...) to the card, it returns sw=0x6985.

But when I send the same command with pyApdutool, I get "611C".

It's odd. Could anyone give me a tip? Why does this happen?

When it returns "61 1C" response, you need to send "Get response" APDU command.
>> 00 C0 00 00 1C

horse dream wrote:When it returns "61 1C" response, you need to send "Get response" APDU command.
>> 00 C0 00 00 1C

Hi @ horse dream. Thank your for your answer. But I know this. My main question is why I got different status word("6985", "611C") when I send the same command via my java code and APDUTool.

You may try to append 0x1C to APDU command, just like:
80 50 00 00 0X AID 1C
note: 0x is the AID's length.

nearsunshine wrote:Hi @ horse dream. Thank your for your answer. But I know this. My main question is why I got different status word("6985", "611C") when I send the same command via my java code and APDUTool.

For java, there is a "feature" in a package javax.smartcardio when it is working with a card protocol T=0
The solution of problem is to update that package with the errorless release.
You may have a try.

The pyApdu tool select Security Domain (SD) first, and the INITIALIZE UPDATE command get response succeeded.
Make sure that your offcard application select SD first. If not, and if your card has one applet had RESET privilege. The INITIALIZE UPDATE command will be sent to the applet.