javacard

I have an applet (you can take a look at it there JavaCard applet is not working with RSA encryption ). Applet generates RSA public and private keys in constructor and with APDU command encrypt some byte array. Applet generates public and private keys with KeyBuilder.LENGTH_RSA_2048 in docs provided with cards sad that JavaCard supports 2048 bits key length only in DDA. So question is what is DDA and SDA. Differences between them? And main question is: how to install (or run?) applet in this mode? What I found out: Update 1 : SDA -- Static Data Authentication DDA -- Dynamic Data Authentication

I have 4 different types of JavaCards. For a weird purpose, I wrote the following applet to return whole the APDU buffer on reception of each APDU command: package bufferReturner; import javacard.framework.APDU; import javacard.framework.Applet; import javacard.framework.ISOException; public class BufferReturner extends Applet { private BufferReturner() { } public static void install(byte bArray[], short bOffset, byte bLength) throws ISOException { new BufferReturner().register(); } public void process(APDU arg0) throws ISOException { arg0.setOutgoingAndSend((short)0, (short)256); } } When I

I am writing an applet that stores 3 files of different sizes 5 Kb, 7 Kb and 11 Kb. I have got no problems with storing the files inside the applet. But when I try to read them back, I can only read the first two (smaller files). The third file throws an exception: javax.smartcardio.CardException: Could not obtain response at sun.security.smartcardio.ChannelImpl.doTransmit(Unknown Source) at sun.security.smartcardio.ChannelImpl.transmit(Unknown Source) I have tried to figure out the problem and I have found out it has to do with the size of the file. So I created a test file of size 7 Kb and

I'm searching for a way to find a unique number for every smart card I work with. I have heard there are IC Fabrication date, IC Serial Number and IC Batch Identifier that are unique for every card. how can I get these information from my card? guidot Surely every hardware supplier integrates information like the mentioned into the chip. This unfortunately leaves the following problems: The information may or may not be made available by the operating system There is little in common between several hardware suppliers beneath the one byte manufacturer ID, which is maintained globally (see e.g.

Is there a way to generate PrivateKey from byte array? I got this byte array using getEncoded() method, but now I have to convert it back to PrivateKey. Thanks, Vuk I was looking for this answer too and finally found it. keyBytes is a byte array originally created with getEncoded(). //add BouncyCastle as a provider if you want Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider()); //create a keyfactory - use whichever algorithm and provider KeyFactory kf = KeyFactory.getInstance("DSA", "BC"); //for private keys use PKCS8EncodedKeySpec; for public keys use

Hello I'm working on a project on Java Card which implies a lot of modulo-multiplication. I managed to implement an modulo-multiplication on this platform using RSA cryptosystem but it seems to work for certain numbers. public byte[] modMultiply(byte[] x, short xOffset, short xLength, byte[] y, short yOffset, short yLength, short tempOutoffset) { //copy x value to temporary rambuffer Util.arrayCopy(x, xOffset, tempBuffer, tempOutoffset, xLength); // copy the y value to match th size of rsa_object Util.arrayFillNonAtomic(eempromTempBuffer, (short)0, (byte) (Configuration.LENGTH_RSAOBJECT