Java实现DES加密解密代码详解编程语言

import java.io.IOException; 
import java.io.Serializable; 
import java.security.InvalidKeyException; 
import java.security.NoSuchAlgorithmException; 
 
import javax.crypto.BadPaddingException; 
import javax.crypto.Cipher; 
import javax.crypto.IllegalBlockSizeException; 
import javax.crypto.KeyGenerator; 
import javax.crypto.NoSuchPaddingException; 
import javax.crypto.SealedObject; 
import javax.crypto.SecretKey; 
 
public class EncryptDecryptObjectWithDES { 
 
    private static Cipher ecipher; 
    private static Cipher dcipher; 
 
    private static SecretKey key; 
 
    public static void main(String[] args) { 
 
        try { 
 
            // generate secret key using DES algorithm 
            key = KeyGenerator.getInstance("DES").generateKey(); 
 
            ecipher = Cipher.getInstance("DES"); 
            dcipher = Cipher.getInstance("DES"); 
 
            // initialize the ciphers with the given key 
            ecipher.init(Cipher.ENCRYPT_MODE, key); 
            dcipher.init(Cipher.DECRYPT_MODE, key); 
 
            // create a sealed object 
            SealedObject sealed = new SealedObject(new SecretObject("My secret message"), ecipher); 
 
            // get the algorithm with the object has been sealed 
            String algorithm = sealed.getAlgorithm(); 
            System.out.println("Algorithm " + algorithm); 
 
            // unseal (decrypt) the object 
            SecretObject o = (SecretObject) sealed.getObject(dcipher); 
 
            System.out.println("Original Object: " + o); 
 
        } 
        catch (NoSuchAlgorithmException e) { 
            System.out.println("No Such Algorithm:" + e.getMessage()); 
            return; 
        } 
        catch (NoSuchPaddingException e) { 
            System.out.println("No Such Padding:" + e.getMessage()); 
            return; 
        } 
        catch (BadPaddingException e) { 
            System.out.println("Bad Padding:" + e.getMessage()); 
            return; 
        } 
        catch (InvalidKeyException e) { 
            System.out.println("Invalid Key:" + e.getMessage()); 
            return; 
        } 
        catch (IllegalBlockSizeException e) { 
            System.out.println("Illegal Block:" + e.getMessage()); 
            return; 
        } 
        catch (ClassNotFoundException e) { 
            System.out.println("Class Not Found:" + e.getMessage()); 
            return; 
        } 
        catch (IOException e) { 
            System.out.println("I/O Error:" + e.getMessage()); 
            return; 
        } 
 
    } 
 
    public static class SecretObject implements Serializable { 
 
        private static final long serialVersionUID = -1335351770906357695L; 
 
        private final String message; 
 
        public SecretObject(String message) { 
            this.message = message; 
        } 
 
        @Override 
        public String toString() { 
            return "SecretObject [message=" + message + "]"; 
        } 
 
    } 
 
} 

输出：

Algorithm DES 
Original Object: SecretObject [message=My secret message]