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Search found 12 matches

by notuo
Sun Sep 24, 2017 11:10 pm
Forum: Questions & Answers
Topic: How to use jsr177 to access smart card
Replies: 3
Views: 990

How to use jsr177 to access smart card

I would like to use jsr177 to access smart card by sending APDU. But I don't know how APDUs are sent to my smartard? Does jsr177 also use similar pc/sc? Any help is greatly appreciated.
by notuo
Thu May 18, 2017 2:38 am
Forum: Questions & Answers
Topic: How to confirm the integrity of transient array
Replies: 1
Views: 657

How to confirm the integrity of transient array

I am using the transient array to store data. After the signature is computed, the data is encrypted with the 3DES key. After that, the data is transfered into APDU buffer and sent to the terminal. I am using the 2KB keys, so the signature in returned in two APDU responses. How can I confirm the int...
by notuo
Wed May 10, 2017 1:41 am
Forum: Questions & Answers
Topic: How does java card treat the cap file when sending APDU command
Replies: 1
Views: 552

How does java card treat the cap file when sending APDU command

Recently, I am always thinking about one problem: how does a real java card executes APDU based on the cap file?
When we sent APDU command to the card, how does card treats the command and cap file? Anyone knows?
by notuo
Tue Jan 24, 2017 4:04 am
Forum: Shopping FAQ
Topic: JC30M48CR cards chip
Replies: 2
Views: 1555

JC30M48CR cards chip

We are planning to test JC30M48CR card in our application.
Could you please tell us the chip mode that JC30M48CR card uses? Thanks.
by notuo
Mon Oct 17, 2016 11:14 pm
Forum: Algorithm School
Topic: How to get hash of message
Replies: 2
Views: 1125

How to get hash of message

I tried to use MessageDigest to get hash. it always returned 6F 00. I guess MessageDigest.getInstance caused the problem, but I'm not sure. ANY HELP? tHANKS! My sectional code: private void getDigest(byte[] buffer) { if (hashArray == null) hashArray = JCSystem.makeTransientByteArray((short)20, JCSys...
by notuo
Wed Jun 15, 2016 1:30 am
Forum: Questions & Answers
Topic: confused with the API methods
Replies: 2
Views: 1014

Re: confused with the API methods

receiveBytes(short bOff) method retrieves data from the card OS and populates the APDU buffer.

You don't have to copy data to APDU buffer because the JCRE does the copy for you.
by notuo
Mon May 23, 2016 4:42 am
Forum: Card Products
Topic: key lengths supported by AES
Replies: 3
Views: 1345

Re: key lengths supported by AES

JavaCardOS wrote:Hello! AES algorithms supports the following key length:

LENGTH_AES_128
LENGTH_AES_192
LENGTH_AES_256


Thank you for your kind response! But what about ECC algorithms ? Which key lengths are supported for ECC?
Await for your reply!
by notuo
Mon May 23, 2016 2:36 am
Forum: Card Products
Topic: key lengths supported by AES
Replies: 3
Views: 1345

key lengths supported by AES

Hello! For IFD A22CR card, is there anyone tell me which key lengths does AES algorithm support? thx
by notuo
Wed Apr 27, 2016 4:04 am
Forum: Questions & Answers
Topic: Does extended length APDU affect calculation of C-MAC
Replies: 3
Views: 1386

Re: Does extended length APDU affect calculation of C-MAC

Do you have a reference that specifically addresses extended length APDUs for GP? My concern is related to the coding of Lc and the SCP01 length (L) byte for encrypted data. For SCP01, the length of the data field prior to padding is explicitly encoded in one byte and pre-pended to the data field. L...
by notuo
Wed Apr 27, 2016 3:16 am
Forum: Questions & Answers
Topic: Does extended length APDU affect calculation of C-MAC
Replies: 3
Views: 1386

Does extended length APDU affect calculation of C-MAC

Hi! If I want to send an extended length APDU, does it affect calculation of various C-MAC?
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