运行下面代码，把main()方法的字符串替换成上一步复制的字符串

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;
import java.util.Random;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

public class FinalShellDecodePass {
 public static void main(String[] args)throws Exception {
     System.out.println(decodePass("替换成上面复制的字符串"));
 }
 public static byte[] desDecode(byte[] data, byte[] head) throws Exception {
     SecureRandom sr = new SecureRandom();
     DESKeySpec dks = new DESKeySpec(head);
     SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
     SecretKey securekey = keyFactory.generateSecret(dks);
     Cipher cipher = Cipher.getInstance("DES");
     cipher.init(2, securekey, sr);
     return cipher.doFinal(data);
 }
 public static String decodePass(String data) throws Exception {
     if (data == null) {
         return null;
     } else {
         String rs = "";
         byte[] buf = Base64.getDecoder().decode(data);
         byte[] head = new byte[8];
         System.arraycopy(buf, 0, head, 0, head.length);
         byte[] d = new byte[buf.length - head.length];
         System.arraycopy(buf, head.length, d, 0, d.length);
         byte[] bt = desDecode(d, ranDomKey(head));
         rs = new String(bt);

         return rs;
     }
 }
 static byte[] ranDomKey(byte[] head) {
     long ks = 3680984568597093857L / (long)(new Random((long)head[5])).nextInt(127);
     Random random = new Random(ks);
     int t = head[0];

     for(int i = 0; i < t; ++i) {
         random.nextLong();
     }

     long n = random.nextLong();
     Random r2 = new Random(n);
     long[] ld = new long[]{(long)head[4], r2.nextLong(), (long)head[7], (long)head[3], r2.nextLong(), (long)head[1], random.nextLong(), (long)head[2]};
     ByteArrayOutputStream bos = new ByteArrayOutputStream();
     DataOutputStream dos = new DataOutputStream(bos);
     long[] var15 = ld;
     int var14 = ld.length;

     for(int var13 = 0; var13 < var14; ++var13) {
         long l = var15[var13];

         try {
             dos.writeLong(l);
         } catch (IOException var18) {
             var18.printStackTrace();
         }
     }

     try {
         dos.close();
     } catch (IOException var17) {
         var17.printStackTrace();
     }

     byte[] keyData = bos.toByteArray();
     keyData = md5(keyData);
     return keyData;
 }
 public static byte[] md5(byte[] data) {
     String ret = null;
     byte[] res=null;

     try {
         MessageDigest m;
         m = MessageDigest.getInstance("MD5");
         m.update(data, 0, data.length);
         res=m.digest();
         ret = new BigInteger(1, res).toString(16);
     } catch (NoSuchAlgorithmException e) {
         e.printStackTrace();
     }
     return res;
 }
}