import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;
import java.io.*;
import java.util.*;

public class Simetric
{
	     
   public SecretKey generaClau() throws Exception
     {
	return null;
     }
   
   public void guardaClau(String fname) throws Exception
     {
     }
   
   public void guardaClauPBE(String fname, String password) throws Exception
     {	     
	
     }
   
   public SecretKey llegeixClau(String fname) throws Exception
     {	     
	return null;
     }
   
   public SecretKey llegeixClauPBE(String fname, String password) throws Exception
     {	     
	return null;
     }

   private SecretKey _sk;
}