Search found 30 matches

by choimillen
Tue Dec 04, 2018 11:38 pm
Forum: Shopping FAQ
Topic: Stickers format for JC30M48CR
Replies: 2
Views: 9282

Stickers format for JC30M48CR

Hi JavaCardOS official, I have test JC30M48CR cards and up to now we have good experience with your cards.But there is a new requirement in our project. We need the this card to be stickers format. Can you provide this customization service for this card? If YES, please let me know. Thanks& regards,...
by choimillen
Fri Oct 13, 2017 3:53 am
Forum: Questions & Answers
Topic: Doubt about JavaCard Memory
Replies: 3
Views: 3085

Re: Doubt about JavaCard Memory

When you create a byte array, all values are initialized to 0. Looking at your loops, it seems you're adding 0's only. Smart card operating systems normally do a read before write, to make sure not the same value is written. It saves time, and in case of EEPROM also to prolong the lifetime. I think ...
by choimillen
Mon Oct 02, 2017 12:44 am
Forum: Questions & Answers
Topic: Cryptographic operations with the Card Manager
Replies: 3
Views: 3294

Re: Cryptographic operations with the Card Manager

Due to security reasons reading the key back is prohibited. You can only get information what type of key is stored.
by choimillen
Sun Oct 01, 2017 5:25 pm
Forum: Questions & Answers
Topic: Cryptographic operations with the Card Manager
Replies: 3
Views: 3294

Re: Cryptographic operations with the Card Manager

You cannot do cryptographic operations with ISD. You must write an applet and use KeyPair and Signature class.
by choimillen
Fri Sep 15, 2017 5:14 am
Forum: Questions & Answers
Topic: Error 6E00 when receiving the response data under T0
Replies: 2
Views: 2789

Re: Error 6E00 when receiving the response data under T0

For T=0, JCRE needs to send 61xx , where xx is the number of expected bytes. The CAD then sends a GET RESPONSE, with the same CLA byte as before and Le == xx. Finally the JCRE send the response.
by choimillen
Fri Sep 15, 2017 4:15 am
Forum: Questions & Answers
Topic: command usage of GET-DATA and STORE-DATA
Replies: 1
Views: 3017

Re: command usage of GET-DATA and STORE-DATA

You cannot use all the Data Grouping Index, 2 byte TLV . Some are already populated and can only be read, others cannot be written. Use the 0070 Data Grouping Index to put your data into the Security Domain's data store.
by choimillen
Fri Aug 11, 2017 3:40 am
Forum: Questions & Answers
Topic: TCP of Java Card 3.0
Replies: 1
Views: 2303

Re: TCP of Java Card 3.0

TCP is mandatory, and APDU is mandatory as well, as you need to be compatible to the Classic Edition. You need to run a server on the card and your communication layer has to process the TCP over IP/UDP/USB packets beforehand.
by choimillen
Sat May 27, 2017 5:26 am
Forum: Questions & Answers
Topic: Find the data back in Buffer
Replies: 3
Views: 3014

Re: Find the data back in Buffer

Please add this command:

Code: Select all

apdu.setIncomingAndReceive();
by choimillen
Tue Jan 24, 2017 4:07 am
Forum: Questions & Answers
Topic: How to use keyBuilder class
Replies: 3
Views: 3453

Re: How to use keyBuilder class

Build a key using keybuilder methods and cast: RSAPublicKey k1 = (RSAPublicKey)KeyBuilder.buildKey(KeyBuilder.TYPE_RSA_PUBLIC, KeyBuilder.LENGTH_RSA_1024); Then, use: k1.setExponent(bytearray, offsettoexponent); k1.setModulus(bytearray, offsettomodulus); k1.getExponent(destination, wheretostore); .....
by choimillen
Mon Jan 16, 2017 5:38 am
Forum: Questions & Answers
Topic: supplementary security domain
Replies: 1
Views: 2422

Re: supplementary security domain

A SSD does not have the same functionality as an ISD. ISD is open in GP terms. Cards may have a load file pre-loaded that can instantiate an SSD.
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