將密鑰轉換爲字符串並返回密鑰Java

Question

所以我試圖將密鑰轉換爲字符串，所以我可以用System.out顯示它，然後我想將它轉換回密鑰。我能夠使用BASE64Encoder將其轉換爲字符串，但是我有問題將其轉換回來。下面是我的源代碼：

public class Encryption extends Applet { 
    Key keyOrig; 
    BASE64Decoder decoder = new BASE64Decoder(); 
    BASE64Encoder encoder = new BASE64Encoder(); 

    public void init() { 
     try { 
      keyOrig = generateKey(); 

      String keyString = encoder.encode(keyOrig.getEncoded()); 
      System.out.println("Key: "+keyString); 

      Key key = new SecretKeySpec(keyString.getBytes(),0,keyString.getBytes().length, "DES");  

      String message = "This is hacker proof!"; 
      System.out.println("Message is: "+message); 

      String encryptedMessage = encrypt(message,key); 
      System.out.println("Message encrypted: "+ encryptedMessage); 

      String decryptedMessage = decrypt(encryptedMessage,key); 
      System.out.println("Message decrypted: "+ decryptedMessage); 



     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    public Key generateKey() throws NoSuchAlgorithmException { 
     KeyGenerator generator; 
     generator = KeyGenerator.getInstance("DES"); 
     generator.init(new SecureRandom()); 
     return keyOrig = generator.generateKey(); 
    } 

    @SuppressWarnings("unused") 
    public String encrypt(String message, Key key) 
      throws IllegalBlockSizeException, BadPaddingException, 
      NoSuchAlgorithmException, NoSuchPaddingException, 
      InvalidKeyException, UnsupportedEncodingException { 
     // Get a cipher object. 
     Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); 
     cipher.init(Cipher.ENCRYPT_MODE, key); 

     // Gets the raw bytes to encrypt, UTF8 is needed for 
     // having a standard character set 
     byte[] stringBytes = message.getBytes("UTF8"); 

     // encrypt using the cypher 
     byte[] raw = cipher.doFinal(stringBytes); 

     // converts to base64 for easier display. 
     @SuppressWarnings("restriction") 
     BASE64Encoder encoder = new BASE64Encoder(); 
     String base64 = encoder.encode(raw); 

     return base64; 
    } 

    public String decrypt(String encrypted, Key key) throws InvalidKeyException, 
      NoSuchAlgorithmException, NoSuchPaddingException, 
      IllegalBlockSizeException, BadPaddingException, IOException { 

     // Get a cipher object. 
     Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); 
     cipher.init(Cipher.DECRYPT_MODE, key); 

     // decode the BASE64 coded message 
     BASE64Decoder decoder = new BASE64Decoder(); 
     byte[] raw = decoder.decodeBuffer(encrypted); 

     // decode the message 
     byte[] stringBytes = cipher.doFinal(raw); 

     // converts the decoded message to a String 
     String clear = new String(stringBytes, "UTF8"); 
     return clear; 
    } 
} 

Answer 1

你永遠不可能用你BASE64Decoder聯合國基-64的字符串。

替換此：

 Key key = new SecretKeySpec(keyString.getBytes(),0,keyString.getBytes().length, "DES");  

與

 byte[] encodedKey = decoder.decodeBuffer(keyString); 
     Key key = new SecretKeySpec(encodedKey,0,encodedKey.length, "DES");