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 53 matches

by DaHuFa
Mon Sep 17, 2018 1:22 am
Forum: Questions & Answers
Topic: A question of PKCS5
Replies: 2
Views: 6298

A question of PKCS5

Hi, everyone. Anyone know how to calculate PKCS5 padding algorithm? I knew that the PKCS5 padding algorithm fills bytes at the end of data until the length of total data is multiple block size. For example, AES block size is 32 bytes. And the data is 30 bytes. The padding bytes is "0202". If the dat...
by DaHuFa
Sat Sep 15, 2018 11:03 pm
Forum: Questions & Answers
Topic: I have a question about API getAvailableMemory
Replies: 1
Views: 4973

Re: I have a question about API getAvailableMemory

First, in Java, there is no unsigned number. So it must be a signed number.
Second, array indicates a big number. conjecture according to general carry, it should be total memory = array[0]*32767 + array[1].
by DaHuFa
Sat Sep 15, 2018 10:58 pm
Forum: Questions & Answers
Topic: I have a question about generateSecret
Replies: 3
Views: 6777

Re: I have a question about generateSecret

I don't think so.
The "inconsistent" may mean "the public point " not on the curve of the private key. If the result is point-at-infinity, the return value may be 0. After all, the return is "byte length of secret".
All these are my conjectures. I hope it will help you.
by DaHuFa
Tue Sep 11, 2018 5:13 am
Forum: Questions & Answers
Topic: How to establish Secure Channel
Replies: 1
Views: 5629

Re: How to establish Secure Channel

The Secure Channel provides a secure communication channel between a card and an off-card entity during an Application Session. Do you know the Secure Channel key set of the application or the security domain keys ? Only you know the key, you can establish the secure channel. The 10 chapter of Globa...
by DaHuFa
Tue Sep 11, 2018 4:57 am
Forum: Questions & Answers
Topic: Why my ccid cannot send the message which the length is equal to package length
Replies: 1
Views: 4792

Re: Why my ccid cannot send the message which the length is equal to package length

I got the answer from <Device Class: Smart Card>. The CCID is required to send a Zero Length Packet (ZLP) following any Bulk-In message that is a multiple of MaxPacketSize. This ZLP allows the CCID device driver to be more efficient, and is generally considered “good-practice” for USB bulk-in pipes....
by DaHuFa
Fri Aug 31, 2018 2:54 am
Forum: Questions & Answers
Topic: Why my ccid cannot send the message which the length is equal to package length
Replies: 1
Views: 4792

Why my ccid cannot send the message which the length is equal to package length

Hello, everybody~
lately, I implement the CCID protocol. Then I test it. The first problem appeared. If the length of message is package length, the communication would become silent. Other circumstances, the communication is ok. You could help me?
by DaHuFa
Thu Aug 30, 2018 2:23 am
Forum: Questions & Answers
Topic: How to get the verify value 'v' in ECDSA
Replies: 1
Views: 4660

Re: How to get the verify value 'v' in ECDSA

I think you should re-implement your ECDSA api.
by DaHuFa
Tue Aug 14, 2018 4:16 am
Forum: Questions & Answers
Topic: T0 Parsing
Replies: 9
Views: 17316

Re: T0 Parsing

I expect learn more~
For example, T1 and contactless and so on. :lol:
by DaHuFa
Tue Aug 14, 2018 4:11 am
Forum: Questions & Answers
Topic: Dose there have windows standalone logon selotion
Replies: 2
Views: 5839

Re: Dose there have windows standalone logon selotion

It looks like a fido device.
Do you mean that when you connect the smartcard, the windows exchange data with smartcard, then you needn't input password ?
by DaHuFa
Sun Jul 15, 2018 11:49 pm
Forum: Questions & Answers
Topic: How to set EC parameters of Keypair
Replies: 5
Views: 9420

Re: How to set EC parameters of Keypair

It works! Thank you very much~
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