Our Online Store have the new products: RFID antenna board. Currently it can work with JC10M24R and JCOP4 card chips.
Compared with normal cards, the antenna board module has a smaller size and fixed holes, which is easy to integrate in the IOT(Internet Of Things) project.

Search found 14 matches

by wousim
Mon Jul 10, 2017 2:37 am
Forum: Questions & Answers
Topic: Directory Tree of Java Card Filesystem
Replies: 4
Views: 10277

Re: Directory Tree of Java Card Filesystem

There is no standard command for listing all EFs and DFs on the java cards.
Most tools have a pre saved list of the file structure and select them one by one on the card. If the result is OK (9Fxx) then the specified file exists on the card.
by wousim
Fri Jun 30, 2017 2:31 am
Forum: Questions & Answers
Topic: RSA encryption problem
Replies: 2
Views: 7021

Re: RSA encryption problem

Show us code pls.
by wousim
Mon Jul 18, 2016 3:46 am
Forum: Questions & Answers
Topic: Generate a key based on a byte array
Replies: 1
Views: 5621

Re: Generate a key based on a byte array

View the below screenshot from java card API 3.0.4 DES_KEY.png DESKey contains an 8/16/24-byte key for single/2 key triple DES/3 key triple DES operations. For example: If you want to use 3 key 3DES: You will need a 24 byte array containing some data related to your password. You should use a messag...
by wousim
Mon Jul 18, 2016 2:27 am
Forum: JCAlgTest
Topic: Error while in testing JavaCOS A22 dual interface Java card with RSA and encryption/signing
Replies: 5
Views: 25805

Re: Error while in testing JavaCOS A22 dual interface Java card with RSA and encryption/signing

JFYI:

I have encountered this problem before. I found there was something wrong with RSA algo in A22CR.

Recently, I bought several A22CR cards from JavaCardOS e-shop and the cards didn't have any problem with RSA.

I guessed that the problem has been fixed.
by wousim
Sat Jul 16, 2016 5:08 am
Forum: Questions & Answers
Topic: the length of cipher
Replies: 2
Views: 6666

Re: the length of cipher

That is just due to the cipher padding method. You should be able to safely ignore the last 8 bytes though as CBC mode does not cause the first block to be different even though there is additional padding.
by wousim
Tue Jul 12, 2016 1:55 am
Forum: Questions & Answers
Topic: RSA encryption algorithm
Replies: 3
Views: 8777

Re: RSA encryption algorithm

For T=0 protocol, you can not receive the data in the same APDU response. You should send GET RESPONSE command to get the data.
It's the limitation of T=0 protocol.
by wousim
Fri Jul 01, 2016 9:34 pm
Forum: Questions & Answers
Topic: the max size of atomic transaction buffer
Replies: 3
Views: 7560

Re: the max size of atomic transaction buffer

You'd better not do this! You may either receive 0x6F00 or have your transaction rolled back.
by wousim
Thu Jun 30, 2016 1:59 am
Forum: Questions & Answers
Topic: the max size of atomic transaction buffer
Replies: 3
Views: 7560

Re: the max size of atomic transaction buffer

It‘s set by the card manufacturer.

There are several methods in the JCSystem class that can do this - getMaxCommitCapacity and getUnusedCommitCapacity.
by wousim
Wed May 04, 2016 4:18 am
Forum: Questions & Answers
Topic: Question about PUT KEY command
Replies: 4
Views: 9504

Re: Question about PUT KEY command

Dear mabel,

I got it!

But could you please explain what is Key Check value field?

Thanks!
by wousim
Wed May 04, 2016 2:28 am
Forum: Questions & Answers
Topic: Question about PUT KEY command
Replies: 4
Views: 9504

Question about PUT KEY command

I have read the section "PUT KEY command" in GlobalPlatform Card Specification 2.1.1 It defines the structure of this APDU command PUT KEY COMMAND.png Data field structure Data structure.png But now I have a PUT KEY command: 80 D8 01 00 16 CD E5 F1 B9 49 F1 1F A7 6B BF 0E 91 32 23 C2 E6 00...
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