Question

我使用AES加密了.txt文件，tha文件包含整数，现在我试图将其解密为下面的代码：

   try {
   FileOutputStream outStream;
   CipherOutputStream cos;
   try (FileInputStream file = new FileInputStream(pOld.toString())) {
       outStream = new FileOutputStream(pNew.toString());
       byte k[]= Key.getBytes();
       SecretKeySpec KEYY=new SecretKeySpec(k, EncAlgo);
       Cipher enc = Cipher.getInstance(EncAlgo);
       enc.init(Cipher.DECRYPT_MODE, KEYY);
       cos = new CipherOutputStream(outStream,enc);
       byte [] buffer = new byte[1024];
       int read;
       while((read=file.read(buffer))!=-1)
       {

          cos.write(buffer, 0, read);
       }
   }
        outStream.flush();
        cos.close();
        JOptionPane.showMessageDialog(null, "The Message Was Decrypted Successfully");           
    }
 catch(HeadlessException | IOException | InvalidKeyException |      NoSuchAlgorithmException | NoSuchPaddingException e) {
JOptionPane.showMessageDialog(null, "Decryption Failed");
 }

但解密的.txt结果文件总是空的！任何想法为什么会发生？它告诉我解密成功了，但file.txt是空的！

因此： POld，PNew =＆gt; Paths.txt ///// AncAlgo =＆＃34; AES＆＃34; 我试过解密.txt和.jpg文件，两者都是空的，这里是特定AES的加密代码，两者都具有相同的密钥::

 public static void EncryptFile(Path POld, String key, Path PNew)
{
    try {

        File FileOld = new File(POld.toString());
        FileInputStream file = new FileInputStream(FileOld);
        FileOutputStream outStream = new FileOutputStream(FileOld);
        byte k[]= key.getBytes();
        SecretKeySpec KEYY=new SecretKeySpec(k, "AES");
        Cipher enc = Cipher.getInstance("AES");
        enc.init(Cipher.ENCRYPT_MODE, KEYY);
        CipherOutputStream cos = new CipherOutputStream(outStream,enc);
        byte[] buffer = new byte[1024];
        int read;
        while((read=file.read(buffer))!=-1){
            cos.write(buffer, 0, read);
        }
        file.close();
        outStream.flush();
        cos.close();
       JOptionPane.showMessageDialog(null, "Encrypted!");


    }
    catch(FileNotFoundException e) {
       JOptionPane.showMessageDialog(null, "File Not Found!");
    }
    catch (IOException e){
        JOptionPane.showMessageDialog(null, "IO Exception!");
    }
    catch (NoSuchPaddingException e){
        JOptionPane.showMessageDialog(null, "No such padding!");
    }
    catch (NoSuchAlgorithmException e){
        JOptionPane.showMessageDialog(null, "No Such Algorithm!");
    }
    catch (InvalidKeyException e){
        JOptionPane.showMessageDialog(null, "Invalid Key!");
    }
}

Answer 1

您在加密代码中使用新的输出文件覆盖输入文件。您正在生成零长度文件。您需要生成一个新文件。

AES，DES解密后清空文件

1 个答案: