Java Card SDK problem

Hello,
I have downloaded :
*>java_card_kit-2_1_1-unix.tar.Z
I am using Linux Mandrake 8.1 and j2sdk1.4.0_01.
After installing and setting env vars I tried
to run "jcwde" but it returned with:
*>Error: native VM not supported
I didn't find a linux specific download but I guess the unix download should work?!
If the error comes because of wrong download, does anybody knows if there is one
for Linux?
thank you,
John

I find it hard to beleive that the kit didn't come with a README since I'm reading it right now !
This is taken directly from it.
Java Card 2.2
" Supported Platforms
* Windows� NT 4.0 with Service Pack 6
* Solaris� 8 (SunOS 5.8) Operating Environment (SPARCTM platforms)
Java Development Kit: Java2 SDK, Standard Edition (version 1.3) "
Java Card 2.1
Supported Platforms
o Windows NT 4.0 with Service Pack 4
o Solaris(TM) 2.6 (SunOS 5.6) Operating Environment (SPARC(TM) platforms)
o Solaris 7 (SunOS 5.7) Operating Environment (SPARC(TM) platforms)
o Solaris 8 (SunOS 5.8) Operating Environment (SPARC(TM) platforms)
Java Development Kit: Java2 SDK, Standard Edition (version 1.2.2 or 1.3)

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hi
i'm fairly new to the java programming language. i'm trying to write an RSA java card applet to run on a java card simulator.
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thanx
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import java.math.*;
import java.util.*;
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BigInteger n,e;
String owner;//variable for holding owners name
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make a public key from a private key.*/
publickey(String iowner,BigInteger in,BigInteger ie){
owner=iowner;
n=in;
e=ie;
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byte[] buffer = apdu.getBuffer();
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owner=st.nextToken();
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number from 1 to n (n not included).
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BigInteger encrypt(BigInteger m){
return m.modPow(e,n);
/*make a string from this key.*/
public String toString(){
return owner+" "+printBI(n)+" "+printBI(e);
/*help methods for reading and writing:*/
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static String printBI(BigInteger b){
return b.toString(radix);
static BigInteger readBI(String s){
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suitable for encryption. To do this random bits
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BigInteger makemessage(byte[] input){
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(in the standard java help). */
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byte[] paddedinput=new byte[n.bitLength()/8-1];
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paddedinput[i+1]=input;
paddedinput[0]=(byte)input.length;
for(int i=input.length+1;i<paddedinput.length;i++)
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static byte[] getmessage(BigInteger b){
byte[] paddedoutput=b.toByteArray();
byte[] output=new byte[paddedoutput[0]];
for(int i=0;i<output.length;i++)
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class privatekey{
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BigInteger n,e,d;
String owner;
int bits;
Random ran;
/*unimportant things, needed for calculations:*/
static int certainty=32;
static BigInteger one=new BigInteger("1"),
three=new BigInteger("3"),
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k65=new BigInteger("65537");
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key, and the number of bits.
owner: all spaces will be replaced with underscores.
bits: the more bits the better the security. Every
value above 500 is 'safe'. If you are a really paranoid
person, you should use 2000.*/
privatekey(String iowner,int ibits){
BigInteger p,q;
bits=ibits;
owner=iowner.replace(' ','_');//remove spaces from owner name.
ran=new Random();
p=new BigInteger(bits/2,certainty,ran);
q=new BigInteger((bits+1)/2,certainty,ran);
n=p.multiply(q);
BigInteger fi_n=fi(p,q);
e=chooseprimeto(fi_n);
d=e.modInverse(fi_n);
/*read the key back from a string*/
privatekey(String from){
StringTokenizer st=new StringTokenizer(from," ");
st.nextToken();
n=readBI(st.nextToken());
e=readBI(st.nextToken());
d=readBI(st.nextToken());
/*some help methods:*/
static BigInteger fi(BigInteger prime1,BigInteger prime2){
return prime1.subtract(one).multiply(prime2.subtract(one));
static BigInteger BI(String s)
{return new BigInteger(s);}
BigInteger chooseprimeto(BigInteger f){
/*returns a number relatively prime to f.
this number is not chosen at random, it first
tries a few primes with few 1's in it. This
doesn't matter for security, but speeds up computations.*/
if(f.gcd(three).equals(one))
return three;
if(f.gcd(seventeen).equals(one))
return seventeen;
if(f.gcd(k65).equals(one))
return k65;
BigInteger num;
do{
num=new BigInteger(16,ran);
}while(!f.gcd(num).equals(one));
return num;
final static int radix=36;
static String printBI(BigInteger b){
return b.toString(radix);
static BigInteger readBI(String s){
return new BigInteger(s,radix);
/*returns the public key of this private key.*/
publickey getpublickey(){
return new publickey(owner,n,e);
/*the same encryption that the public key does.*/
BigInteger encrypt(BigInteger m){
return m.modPow(e,n);
/*decryption is the opposite of encryption: it
brings the original message back.*/
BigInteger decrypt(BigInteger m){
return m.modPow(d,n);
public String toString(){
return owner+" "+printBI(n)+" "+printBI(e)+" "+printBI(d);
/*this main demonstrates the use of this program.*/
public static void main(String[] ps){
say("************ make key:");
privatekey priv=new privatekey("sieuwert",92);
publickey pub=priv.getpublickey();
say("the public key:"+priv);
say("************ encrypt message:");
byte[] P="RUOK?".getBytes();
BigInteger Pc=pub.makemessage(P);
say("converted:\t"+printBI(Pc));
BigInteger C=pub.encrypt(Pc);
say("coded message: "+printBI(C));
say("************ decrypt message:");
BigInteger Pc2=priv.decrypt(C);
say("decoded:\t"+printBI(Pc2));
byte[] P2=publickey.getmessage(Pc2);
say("deconverted: "+new String(P2));
static void say(String s){
System.out.println(s);

Command APDU is not written in your source code, rather it is sent from PC or programmed Card Acceptance Device/ Card Reader/ Terminal.
The code installed in the Java Card should be able to handle the Command APDU received and process it accordingly, and finally your code should be able to send out response APDU.
You may think your code as a decoder, to retrieve each byte (CLA, INS, P1, P2, DATA, LC) using the Java Card API, you should be able to do it.
Also, I notice in your code that you want to work out with strings, but Java Card does not support strings, chars, long, float, double ...
to send out reponse APDU, there are certain steps that you can use, not just simply print like ordinary J2SE may use.
hope this will help u

Java Card SDK problem

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