javacard

As you know, we prove to the card that we are the authentic user, via INITIAL UPDATE and EXTERNAL AUTHENTICATION commands, as follow : < 80 50 00 00 08 | Host Challenge > ... < 84 82 03 00 10 | Host Cryptogram | MAK > ... I want to know, what is the differece between this authentication process and the VERIFYING process with CLA 20 P1 P2 Lc Data Le APDU? All cards support both? or each card use one of this mechanism? Update: As you see, I upload and install my applet on the card successfully , [Without using Verification]! So why I need verificatin : C:\Users\ghasemi\Desktop\gpj-20120310>gpj

I would like to create NFC Payment Application based on Android Kitkat 4.4 which now support the NFC Card Emulation Mode for both not involving secure element and involving secure element. I would like to let My Application involve a secure element. So, I have a question. The Android KitKat can let my application access to the java card applet which is installed into a secure element? No, while the Android HCE documentation lists the possibility to use secure element-based card emulation, there are several problems hindering the use of a secure element in current devices: Nexus devices have a

I have a fresh card with the below code as its ATR. 3B 68 00 00 00 73 C8 40 12 00 90 00 I searched this ATR in google and finally I know this is a "Brazilian e-CPF card". the question is how I can use this card? I mean what APDUs for example it supports? is there any datasheet for it? is it a javacard? [if yes] how I can upload a .cap file in it? is there any default key for it? and a lot of this kind of questions. the mainly question is that : what kind of data I can gain from an ATR? btw I use ACR38 SmartCard reader. and I create a .cap javacard program in Eclipse. Next Question: I use GPJ

I have written an applet and installed it in smart card. But I don't know how to read and write data to smart card? private void readName(APDU apdu) throws ISOException { byte[] apduBuffer = apdu.getBuffer(); for (byte i=0; i<userName.length; i++) { apduBuffer[5+i] = userName[(byte)i] ; } apdu.setOutgoing(); apdu.setOutgoingLength((short)userName.length); apdu.sendBytes((short)5, (short)userName.length); } Is it right code to read data from smart card? please tell me how to write data to smart card using javacard. Your card is either contact or contactless. Since you say you have already

I'm currently working on a JavaCard project (v.2.2.2) and I need to compute values using square roots, logarithms, etc... I know that the Math class isn't available in JavaCard API and wonder if there exists another library which provides such operations ? And also I can't use double values but I need to. Is there a way to represent a double value in the JavaCard API and perform operation (such as log, sqrt, etc..) ? Any help appreciated ! The javacard 2.2.2 only supports boolean, byte, short, and optionally int. If you really need to perform Math, then you need to create your own class with