Java加密/解密

Question

幫幫我我不能讓解密工作？ 這個程序已經得到加密，但不解密如何解決這個問題？

import javax.crypto.*; 
import java.util.Scanner; 
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.SecretKey; 

public class CIBAw 
{  
    public static void main(String[] argv) 
    { 
     Scanner input = new Scanner(System.in); 
     Scanner File = new Scanner(System.in); 
     try 
     { 
      KeyGenerator keygenerator = KeyGenerator.getInstance("DES"); 
      SecretKey myDesKey = keygenerator.generateKey(); 
      Cipher desCipher; 
      desCipher = Cipher.getInstance("DES"); 
      desCipher.init(Cipher.ENCRYPT_MODE, myDesKey); 
      System.out.println("Encrypt a File"); 
      System.out.print("Enter a sentence:"); 
      //String file = File.nextLine(); 
      byte[] text = "".getBytes(); 
      System.out.println("" + new String(text)); 
      // Encrypt the text 
      byte[] textEncrypted = desCipher.doFinal(text); 
      System.out.println("File Encryted : " + textEncrypted); 
      // Initialize the same cipher for decryption 
      desCipher.init(Cipher.DECRYPT_MODE, myDesKey); 
      // Decrypt the text 
      byte[] textDecrypted = desCipher.doFinal(textEncrypted); 
      System.out.println("File Decryted : " + new String(textDecrypted)); 

     }catch(NoSuchAlgorithmException e) 
     { 
      e.printStackTrace(); 
     }catch(NoSuchPaddingException e) 
     { 
      e.printStackTrace(); 
     }catch(InvalidKeyException e) 
     { 
      e.printStackTrace(); 
     }catch(IllegalBlockSizeException e) 
     { 
      e.printStackTrace(); 
     }catch(BadPaddingException e) 
     { 
      e.printStackTrace(); 
     } 

    } 
} 

Answer 1

好看着這之後，我改變了代碼周圍，使其更具可讀性，並給你一個更好的技術到如何處理這個問題：

1. 讀輸入。
2. 創建密鑰（公共/私人）的實例。
3. 將輸入轉換爲字節。
4. 加密輸入並將其打印出來。

5. 解密輸入並打印出來。

   public static void main(String[] args) { 
       Scanner input = new Scanner(System.in); 
       try 
       { 
   
        //Prompt for String 
        System.out.print("Enter a sentence:"); 
        String in = input.next(); 
   
        //Generate Key for encryption/decryption 
        KeyGenerator keygenerator = KeyGenerator.getInstance("DES"); 
        SecretKey myDesKey = keygenerator.generateKey(); 
        Cipher desCipher; 
        desCipher = Cipher.getInstance("DES"); 
        desCipher.init(Cipher.ENCRYPT_MODE, myDesKey); 
   
        //Cast the input into bytes 
        byte[] text = in.getBytes(); 
        System.out.println("" + new String(text)); 
        // Encrypt the text 
        byte[] textEncrypted = desCipher.doFinal(text); 
        System.out.println("File Encryted : " + textEncrypted); 
        // Initialize the same cipher for decryption 
        desCipher.init(Cipher.DECRYPT_MODE, myDesKey); 
        // Decrypt the text 
        byte[] textDecrypted = desCipher.doFinal(textEncrypted); 
        System.out.println("File Decryted : " + new String(textDecrypted)); 
   
       }catch(NoSuchAlgorithmException e) 
       { 
        e.printStackTrace(); 
       }catch(NoSuchPaddingException e) 
       { 
        e.printStackTrace(); 
       }catch(InvalidKeyException e) 
       { 
        e.printStackTrace(); 
       }catch(IllegalBlockSizeException e) 
       { 
        e.printStackTrace(); 
       }catch(BadPaddingException e) 
       { 
        e.printStackTrace(); 
       } 
   
   }