HOW TO I USE THIS RSA http://xtrace.blogspot.com/2012/03/rsa-demo-example.html?showComment=1349091173502#c199333123405145467 TUTOTIAL CODE IN MY LOGIN CODE BELOW I found code but dnt know how to implement

public class LoginScreen extends Activity implements OnClickListener{

  public void onCreate(Bundle icicle)
 {
super.onCreate(icicle);
setContentView(R.layout.login.xml);

TextView lblMobileNo = (TextView)findViewById(R.id.lblMobileNo);
lblMobileNo.setTextColor(getResources().getColor(R.color.text_color_red));

mobile = (EditText)findViewById(R.id.txtMobileNo);

TextView lblPinNo = (TextView)findViewById(R.id.lblPinNo);
lblPinNo.setTextColor(getResources().getColor(R.color.text_color_red));

pin = (EditText)findViewById(R.id.txtPinNo);

btnLogin = (Button)findViewById(R.id.btnLogin);
btnClear = (Button)findViewById(R.id.btnClear);

btnLogin.setOnClickListener(new OnClickListener() {
     public void onClick(View view) {                
         postLoginData();
     }
     });        


btnClear.setOnClickListener(new OnClickListener()
{
public void onClick(View v)

{
    cleartext();
}

  });

/*  

   btnClear.setOnClickListener(new OnClickListener() {
         public void onClick(View arg0) {

         }
         }); 
         */

  }   

  public void postLoginData() 


 {

         Intent i = new Intent(this.getApplicationContext(),NEWCLASS.class);
         Bundle bundle = new Bundle();
         bundle.putString("mno", mobile.getText().toString());
         bundle.putString("pinno", pin.getText().toString());
         i.putExtras(bundle);
         startActivity(i);          }
    }

    @Override
    public void onClick(View v) {

    }  


     public void cleartext() {


 {
    pin.setText("") ;
    mobile.setText("");
 }


  }


 }