文件加密/解密Java

Question

我正在尝试使用 AES 和 Java 加密库加密文件。但这是我在解密文件时发生的错误：“解密时出错：javax.crypto.BadPaddingException：给定的最终块未正确填充。如果在解密过程中使用了错误的密钥，则可能会出现此类问题。”

到目前为止，这是我的代码：

  public static void encrypt(File input, String key, File output) {
        try 
        {
            byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
            IvParameterSpec ivspec = new IvParameterSpec(iv);

            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
            KeySpec spec = new PBEKeySpec(key.toCharArray(), key.getBytes(), 65536, 256);
            SecretKey tmp = factory.generateSecret(spec);
            SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivspec);
            
            FileInputStream inputStream = new FileInputStream(input);
            byte[] inputBytes = new byte[(int) input.length()];
            int count;
             
            byte[] outputBytes = cipher.doFinal(inputBytes);
             
            FileOutputStream outputStream = new FileOutputStream(output);

            while ((count = inputStream.read(inputBytes, 0, inputBytes.length)) > 0)
            {
              outputStream.write(inputBytes, 0, count);
            }
             
            inputStream.close();
            outputStream.close();
        }
        catch (Exception e)
        {
            System.out.println("Error while encrypting: " + e.toString());
        }
        }

    public static void decrypt(File input, String key, File output)
    {
        try
        {
            
            byte[] iv = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
            IvParameterSpec ivspec = new IvParameterSpec(iv);

            SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
            KeySpec spec = new PBEKeySpec(key.toCharArray(), key.getBytes(), 65536, 256);
            SecretKey tmp = factory.generateSecret(spec);
            SecretKeySpec secretKey = new SecretKeySpec(tmp.getEncoded(), "AES");

            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.DECRYPT_MODE, secretKey);
             
            FileInputStream inputStream = new FileInputStream(input);
            byte[] inputBytes = new byte[(int) input.length()];
            
            int count;
             
            byte[] outputBytes = cipher.doFinal(inputBytes);
             
            FileOutputStream outputStream = new FileOutputStream(output);

            while ((count = inputStream.read(inputBytes, 0, inputBytes.length)) > 0)
            {
              outputStream.write(inputBytes, 0, count);
            }
             
            inputStream.close();
            outputStream.close();
        }
        catch (Exception e)
        {
            System.out.println("Error while decrypting: " + e.toString());
        }
    }

可能是什么问题？ 提前致谢！