Problems with Java cryptographic extension?

The line:





Cipher c = Cipher.getInstance("DES");





throws a NoSuchAlgorithmException. This line is taken right out of the Java documentation, can anyone tell me what I'm doing wrong?


These are the imports I'm using:





import java.security.*;


import javax.crypto.*;


import javax.crypto.spec.*;


import javax.crypto.interfaces.*;





Would appreciate any help you could offer.


I'm just trying to encrypt a sting.





Thanks!

Problems with Java cryptographic extension?
I used it b4 as below ....just have an idea





import java.io.*;


import javax.crypto.*;


import javax.crypto.spec.*;


import java.security.*;


import java.security.spec.*;


import java.util.*;





public class EncryptTest {





public static void main(String args[]) {





File desFile = new File("out.des");





// Create data to encrypt


Map map = new TreeMap(System.getProperties());


int number = map.size();





try {





// Create Key


KeyGenerator kg = KeyGenerator.getInstance("DES");


SecretKey secretKey = kg.generateKey();





// Create Cipher


Cipher desCipher =


Cipher.getInstance("DES/ECB/PKCS5Padding...


desCipher.init(Cipher.ENCRYPT_MODE, secretKey);





// Create stream


FileOutputStream fos = new FileOutputStream(desFile);


BufferedOutputStream bos = new BufferedOutputStream(fos);


CipherOutputStream cos = new CipherOutputStream(bos,


desCipher);


ObjectOutputStream oos = new ObjectOutputStream(cos);





// Write objects


oos.writeObject(map);


oos.writeInt(number);


oos.flush();


oos.close();





// Change cipher mode


desCipher.init(Cipher.DECRYPT_MODE, secretKey);





// Create stream


FileInputStream fis = new FileInputStream(desFile);


BufferedInputStream bis = new BufferedInputStream(fis);


CipherInputStream cis = new CipherInputStream(bis,


desCipher);


ObjectInputStream ois = new ObjectInputStream(cis);





// Read objects


Map map2 = (Map)ois.readObject();


int number2 = ois.readInt();


ois.close();





// Compare original with what was read back


if (map.equals(map2) %26amp;%26amp; (map.size() == number2)) {


System.out.println("Everything read back out okay.");


} else {


System.out.println("Problems during


encryption/decryption process.");


}


} catch (NoSuchPaddingException e) {


System.err.println("Padding problem: " + e);


} catch (NoSuchAlgorithmException e) {


System.err.println("Invalid algorithm: " + e);


} catch (InvalidKeyException e) {


System.err.println("Invalid key: " + e);


} catch (IOException e) {


System.err.println("I/O Problem: " + e);


} catch (ClassNotFoundException e) {


System.err.println("Class loading Problem: " + e);


} finally {


if (desFile.exists()) {


desFile.delete();


}


}


}


}








Hope this will solve your issues
Reply:Since this little program does not throw an exception:





import javax.crypto.*;





public class myprog {





public static void main(String args[]){





try


{


Cipher c = Cipher.getInstance("DES");


}catch (Exception e){


e.printStackTrace();


}





}


}





you are not wrapping the line in a try-catch.





It will throw an exception if I change DES to ES for example, so DES is valid as I'm sure you're aware.





The 2 exceptions you should be catching are





NoSuchAlgorithmException,


NoSuchPaddingException





http://java.sun.com/j2se/1.4.2/docs/api/...