Java实现DES加密原理详解

//写的不怎么样。。。悲伤中

package 密码学;
public class DES {
 private static void input1(byte mingwen[])//用随机数模拟对明文的输入（以最简单的二进制的形式），后面会改进
 {
  int i=0;
  for( i=0;i<=31;i++)   
     mingwen[i]=(byte)((Math.random()+0.5));
  for( i=32;i<=63;i++) 
     mingwen[i]=(byte)((Math.random()+0.5));   
  System.out.println("明文：");
  for(i=0;i<=63;i++)
   {
   if(i>0&&(i)%8==0)
    System.out.println(); 
   System.out.print(mingwen[i]+" ");
   }
 }
 private static void input2(byte miyue[])//用随机数模拟对密钥的输入（以最简单的二进制的形式），后面会改进
 {
  int i;
   for(i=0;i<=31;i++)    
      miyue[i]=(byte)((Math.random()+0.5));
   for(i=32;i<=63;i++) 
    miyue[i]=(byte)((Math.random()+0.5)); 
   System.out.println();
   System.out.println("密钥：");
   for(i=0;i<=63;i++)
   {

   if(i>0&&(i)%8==0)
    System.out.println(); 
   System.out.print(miyue[i]+" ");
   }  
 }
 private static void chushiip(int chushiip[])//初始化Ip                                  OK
 {
   int ip[]={58,50,42,34,26,18,10,
     2,60,52,44,36,28,20,12,
     4,62,54,46,38,30,22,14,
     6,64,56,48,40,32,24,16,
     8,57,49,41,33,25,17,9,
     1,59,51,43,35,27,19,11,
     3,61,53,45,37,29,21,13,
     5,63,55,47,39,31,23,15,7};  
   for(int i=0;i<=63;i++)
    chushiip[i]=ip[i]-1; 
 }
 private static void chushiip_1(int chushiip_1[])//初始化Ip_1                                   OK
 {
  int ip_1[]={40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,26,33,1,41,9,49,17,57,25};//用于存放处事置换和逆初始置换的信息
   for(int i=0;i<=63;i++)
    chushiip_1[i]=ip_1[i]-1;  
 }
 private static byte[] 初始置换(byte mingwen[],int ip[])        //OK
 { 
  byte zhuanzhi[]=new byte[64];
  //System.out.print(ip.length+" "+mingwen.length );
  for(int i=0;i<=63;i++)
  {