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Search found 28 matches

by btwtiger
Sat Nov 14, 2015 5:31 am
Forum: Other Tools
Topic: Is there a tools for parsing ATR?
Replies: 7
Views: 3487

Is there a tools for parsing ATR?

To parse the ATR(Answer to reset), every time is very difficult. It need to parse byte by byte, is there a tools for parsing ATR?
by btwtiger
Fri Sep 18, 2015 11:22 pm
Forum: Shopping FAQ
Topic: How long will it take for my goods to arrive Estonia?
Replies: 3
Views: 1541

How long will it take for my goods to arrive Estonia?

I want to buy a certain amount of IFD A40CR cards and bR301 readers.
Would you please tell me when you will make delivery after I place my order and complete payment ?
How long will it take for my goods to arrive the delivery address - Estonia ?
Thanks very much.
by btwtiger
Sat Sep 12, 2015 3:02 am
Forum: Algorithm School
Topic: Javacard CRC32 calculation results are different
Replies: 1
Views: 1522

Javacard CRC32 calculation results are different

I am trying to implement CRC32 algorithm in my java card applet, and I used two methods, but I got two different results. 1. The first way is to use " javacard.security.Checksum" class. package CRC_Test; import javacard.framework.*; import javacard.security.Checksum; import javacard.securi...
by btwtiger
Mon Aug 31, 2015 1:15 am
Forum: Questions & Answers
Topic: Get 6F00 but applet works well
Replies: 4
Views: 2209

Re: Get 6F00 but applet works well

javacardbr wrote:Hello btwtiger, how are you?

What kind of cards you're using?

Best,


Hello my friend.
All the cards that I use are "white cards" . I don't know any details about these cards.
by btwtiger
Fri Aug 28, 2015 10:05 pm
Forum: Questions & Answers
Topic: Get 6F00 but applet works well
Replies: 4
Views: 2209

Get 6F00 but applet works well

I come across something rather strange. I completed an applet compatible with GP 2.1.1 and Java Card 2.2.1. I also have two kinds of cards to test my applet. * When I do the test on the first kind of card, everything goes well. ** For the second kind of card,the cap file can be uploaded successfully...
by btwtiger
Wed Jun 10, 2015 10:13 pm
Forum: Algorithm School
Topic: How to compute values using ' log' and 'sqrt' on javacard ?
Replies: 5
Views: 1880

Re: How to compute values using ' log' on javacard ?

Larson wrote:I've not came across such a class yet. The only way to meet your request is to use some limited tricks with the crypto API.


Would you please give me a example ?
by btwtiger
Wed Jun 10, 2015 9:46 pm
Forum: Algorithm School
Topic: How to compute values using ' log' and 'sqrt' on javacard ?
Replies: 5
Views: 1880

Re: How to compute values using ' log'?

Javacard doesn't support Math class and also only supports boolean, byte, short, and optionally int. Maybe you can create your own class with tricky ways and of course the result is not precise. If you let server/terminal side do complex calculation/encryption, the card only stores data,maybe you c...
by btwtiger
Wed Jun 10, 2015 7:30 am
Forum: Algorithm School
Topic: How to compute values using ' log' and 'sqrt' on javacard ?
Replies: 5
Views: 1880

How to compute values using ' log' and 'sqrt' on javacard ?

Recently,I need to compute values using log and sqrt on a JavaCard. Is there any class for javacard to solve this issue ?
Many thanks.
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