Ihave written the below pieces of code, but i am not able to solve the compilation error here as it shows the error as ArrayOutOfBoundsException error. so please tell me hw to remove the error and please bring the necessary changes.
import java.util.*;
public class Cipher
{
private int n;
private int p;
private int q;
private int d;
private int phi;
private int e;
public void generatePQ()
{
int pickedNumber1 = 0;
int pickedNumber2 = 0;
boolean b = false;
Random rand = new Random();
while(true)
{
pickedNumber1 = rand.nextInt(40)+2;
b = isPrime(pickedNumber1);
if(b == true)
{
break;
}
}
setP(pickedNumber1);
while(true)
{
pickedNumber2 = rand.nextInt(40)+2;
b = isPrime(pickedNumber2);
if(b == true)
{
break;
}
}
setQ(pickedNumber2);
}
public static boolean isPrime(int n)
{
for(int i=2;i<n;i++)
{
if(n%i==0)
return false;
}
return true;
}
public void setP(int a)
{
p = a;
}
public void setQ(int b)
{
q = b;
}
public int getP()
{
return p;
}
public int getQ()
{
return q;
}
public void generateNandPhi()
{
int p = getP();
int q = getQ();
n = p * q;
phi = (p-1) * (q-1);
setN(n);
setPhi(phi);
}
public void setN(int a)
{
n = a;
}
public void setPhi(int b)
{
phi = b;
}
public int getN()
{
return n;
}
public int getPhi()
{
return phi;
}
public int generateEandD()
{
int e1 = 0;
int p_numbers[] = {2,5,7,11,13,17,19,23,29,31,37,41};
int phi = getPhi();
int n = getN();
for(int i = 0; i < 12;i++)
{
if(((phi%p_numbers[i] ) != 0) && (p_numbers[i] < phi))
{
e1 = p_numbers[i];
setE(e1);
break;
}
}
int vals[] = gcd(phi, e1);
try
{
int temp = phi + vals[0];
int d1 = temp / e1;
setD(d1);
}
catch(ArithmeticException ex)
{
System.out.println("Arithmetic Exception occurs");
}
return e1;
}
public void setE(int a)
{
e = a;
}
public int getE()
{
return e;
}
public void setD(int a)
{
d = a;
}
public int getD()
{
return d;
}
public int[] StringToInt(String pt)
{
int j =0;
int k[] = new int[pt.length()];
for(int i=0;i<pt.length();++i)
{
char c = pt.charAt( i );
j = (int) c;
k[i] = j;
}
return k;
}
public int getCipherText(int[] c, int e)
{
int cipher = 0;
try
{
cipher = (int)((Math.pow(c[c.length-1],e)) % n);
}
catch(ArrayIndexOutOfBoundsException ex)
{
System.out.println("Array out of Bounds Exception occured");
}
return cipher;
}
public int[] gcd(int m, int n)
{
if (n == 0)
return new int[] { m, 1, 0 };
int[] vals = gcd(n, m % n);
int d = vals[0];
int a = vals[2];
int b = vals[1] - (m / n) * vals[2];
return new int[] { d, a, b };
}
public String IntToString(int cipherInt)
{
String cipherString = Integer.toString(cipherInt);
return cipherString;
}
}import javax.swing.*;
public class CipherInterface extends JFrame
{
public CipherInterface()
{
setTitle("Cipher");
setBounds(200,200,300,200);
setResizable(false);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new CipherPanel();
this.add(panel);
}
}import javax.swing.*;
public class CipherInterfaceTest
{
public static void main(String ar[])
{
JFrame f = new CipherInterface();
f.setVisible(true);
Cipher r = new Cipher();
r.generatePQ();
r.generateNandPhi();
int er = r.generateEandD();
CipherPanel p = new CipherPanel();
String plaintext = p.getS();
int m[] = r.StringToInt(plaintext);
int l = m.length;
//System.out.print("length = " +l);
int ct = r.getCipherText(m,er);
String sct = r.IntToString(ct);
p.setCipher(sct);
}
}import javax.swing.*;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class CipherPanel extends JPanel
{
private JTextField enterdata, ciphertext;
private JLabel datalabel, ciphertextlabel;
private JButton sendbutton, cancelbutton;
private String s = new String();
public CipherPanel()
{
// displa panel
JPanel displaypanel = new JPanel();
displaypanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
// data label
datalabel = new JLabel("Enter the message: ");
displaypanel.add(datalabel);
// enter data text field
enterdata = new JTextField(10);
enterdata.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
setS(enterdata.getText());
System.out.print("String value =: "+s);
}
});
displaypanel.add(enterdata);
// cipher text label
ciphertextlabel = new JLabel("Cipher Text generated: ");
displaypanel.add(ciphertextlabel);
// ciphertext text field
ciphertext = new JTextField(10);
ciphertext.setEditable(false);
ciphertext.setFocusable(false);
displaypanel.add(ciphertext);
//button panel
JPanel buttonpanel = new JPanel();
buttonpanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
// send button
sendbutton = new JButton("Send");
buttonpanel.add(sendbutton);
// cancel button
cancelbutton = new JButton("Cancel");
buttonpanel.add(cancelbutton);
// add panels to the main panel
this.setLayout(new BorderLayout());
this.add(displaypanel,BorderLayout.CENTER);
this.add(buttonpanel,BorderLayout.SOUTH);
}
public void setS(String txt)
{
s = txt;
}
public String getS()
{
System.out.println(s);
return s;
}
public void setCipher(String panelCipher)
{
ciphertext.setText(panelCipher);
}
}please help me out?
