DES.rar_des

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package SS; import javax.swing.JOptionPane; /** * * @author David */ public class DES { public static void main(String args[]) { int i; DesKey key; key= new DesKey(); String s; s=JOptionPane.showInputDialog(null,"Enter the number '0' for Default assumtion or '1' for if u want to enter the values for KEY"); //Do u want to enter the key or u want program to allot its own key ...If yes press YES or NO"); if(Integer.parseInt(s)==1) { key.enterkey(); } else { key.getkey(); } key.pc1(); key.subkeys(); key.putkey(); DesKey ptext; ptext=new DesKey(); s=JOptionPane.showInputDialog(null,"Enter the number '0' for Default assumtion or '1' for if u want to enter the values for PLAIN TEXT"); //Do u want to enter the key or u want program to allot its own key ...If yes press YES or NO"); if(Integer.parseInt(s)==1) { ptext.entertext(); } else { ptext.gettext(); } System.out.println("\n\tAfter calcutating the Initial permutation of Encrypted message we get :\n"); ptext.ip(); for(i=1;i<17;i++) { ptext.Ebit(); ptext.xorwk(i,key); ptext.sbox(); ptext.xorswap(); ptext.finl(); System.out.println("Here goes the round no : "+i+" using key no " +i); } ptext.swap(); System.out.println("\nThis is the enctrypted message : \n"); ptext.ipin(); System.out.println("\n\n\n\t\tNow Starts the decryption part\n"); System.out.println("\n\tAfter calculating the Initial permutation of Decrypted message we get :\n"); ptext.ip(); int r=1; for(i=16;i>0;i--) { ptext.Ebit(); ptext.xorwk(i,key); ptext.sbox(); ptext.xorswap(); ptext.finl(); System.out.println("\nHere goes the round no : "+r+" using key no " +i); r++; } ptext.swap(); System.out.println("\nThis is the decrypted message\n"); ptext.ipin(); } }