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Search found 141 matches

by tay00000
Tue May 07, 2019 7:23 am
Forum: Algorithm School
Topic: ECDSA (secp256k1) Signature Verification Fails
Replies: 1
Views: 1198

Re: ECDSA (secp256k1) Signature Verification Fails

Firstly, what is this ? SecP256K1.newKeyPair() and how did you derive that ? This is not a default JavaCard API and it seems like some class you made or you imported. We will need more information on that if you can comfortably provide it. This seems to be crucial as it determines how the SECP-256K1...
by tay00000
Tue Apr 30, 2019 2:54 am
Forum: Questions & Answers
Topic: How to get object working over Shareable Interface
Replies: 1
Views: 610

Re: How to get object working over Shareable Interface

Solved by passing the output byte array using the APDU buffer. Why does the APDU buffer work ? Because it is the default global byte array buffer that is allowed to cross between the applet firewall by the JCRE and thus is a natural candidate. APDU buffer also has the advantage of the JCRE automatic...
by tay00000
Mon Apr 29, 2019 4:51 am
Forum: Questions & Answers
Topic: How to get object working over Shareable Interface
Replies: 1
Views: 610

How to get object working over Shareable Interface

We have the classical setup of two applets and a Shareable Interface used by both of them. Shareable Inteface: package API; import javacard.framework.Shareable; public interface API extends Shareable { public void getArray(byte[] output, short off, short len); } Server Applet: package ShareableSampl...
by tay00000
Fri Mar 15, 2019 7:48 am
Forum: Card Products
Topic: C++ programmable smartcard
Replies: 1
Views: 1913

Re: C++ programmable smartcard

C based programmable smart cards are highly limited as 95% of the cards available in the industry is made up of JavaCard. You are better off using JavaCard as JavaCard is the industry standard for smart cards and almost every specification for card systems these days seems to revolve around JavaCard...
by tay00000
Tue Mar 12, 2019 11:20 pm
Forum: Questions & Answers
Topic: JC 3.1
Replies: 3
Views: 1199

Re: JC 3.1

Table - New Features in Java Card API Specification New Feature...........|.....Description ------------------------------------------------------------------- AES ciphering modes.....................Added support for AES-CFB mode for stream ciphering and AES-XTS mode for secure storage. -----------...
by tay00000
Tue Mar 12, 2019 11:06 pm
Forum: Questions & Answers
Topic: JC 3.1
Replies: 3
Views: 1199

JC 3.1

Oracle has recently released JavaCard version 3.1.

JC 3.1 Main Website: https://docs.oracle.com/en/java/javacard/3.1/index.html

JC 3.1 API: https://docs.oracle.com/en/java/javacar ... index.html

Enjoy :D !!!
by tay00000
Thu Feb 07, 2019 11:14 am
Forum: Questions & Answers
Topic: SAM Card Decompile
Replies: 1
Views: 632

Re: SAM Card Decompile

If the SAM card already contains an applet, you will NOT be able to extract the applet codes and data from the SAM card. It is very insecure to allow extraction of code from a SAM/SIM/Smart card so this option is definitely not available at all. The SAM card's purpose is to prevent cloning so the an...
by tay00000
Tue Jan 29, 2019 6:31 am
Forum: Algorithm School
Topic: Is there a good way to implement an AES-CMAC encryption on Java Cards?
Replies: 4
Views: 1136

Re: Is there a good way to implement an AES-CMAC encryption on Java Cards?

Signature.ALG_AES_CMAC_128 is only available from JC 3.0.5 and up.

If you want to implement it yourself, please look at this old forum thread which contains one of our member's source code (https://javacardos.com/javacardforum/vi ... php?t=1114).
by tay00000
Tue Jan 29, 2019 6:16 am
Forum: Applets Development Guide
Topic: Combine two byte array and encrypt them togethor
Replies: 2
Views: 1946

Re: Combine two byte array and encrypt them togethor

Just adding additional points which @owlstead has done a good job in pointing. Here's a couple of extra problems I noticed in the OP's source code. byte [] buffer = new byte [32]; buffer = apdu.getBuffer(); Do you know that by doing that, you will create a persistent memory object with a 32 byte byt...
by tay00000
Tue Jan 22, 2019 7:52 am
Forum: Shopping FAQ
Topic: Feitian JuBiter Blade
Replies: 3
Views: 1303

Re: Feitian JuBiter Blade

Is there any programming API to create applets for the JuBiter card ?
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