Question

我有一个包含一些对象的ArrayList。 Object是登录/传递的容器。
我尝试解码它们，因为我必须在另一次启动后将它们序列化为本地文件以进行娱乐问题是加密过程中我收到了

javax.crypto.IllegalBlockSizeException: Input length not multiple of 16 bytes
    at com.sun.crypto.provider.CipherCore.finalNoPadding(CipherCore.java:1039)
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:983)
    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:845)
    at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:446)

我完全不明白为什么。在我看来，Base64应该处理这个问题。但也许我不能正确理解它的含义我用来加密/解码

public class Move
{
    private static Move instance;

    String key = "pT5IkWNR90gJo5YM";
    String initVector = "RandomInitVector";
    Cipher cipher;


    private Move()
    {
//      try
//      {
//          cipher = Cipher.getInstance("AES/CBC/NoPadding");
//      }
//      catch (NoSuchAlgorithmException | NoSuchPaddingException e)
//      {
//          e.printStackTrace();
//      }
    }


    public void saveData(ArrayList<Account> dataToSave)
    {
        try
        {
            FileOutputStream fileOut = new FileOutputStream(Config.SERIAL_FILE);
            ObjectOutputStream out = new ObjectOutputStream(fileOut);
            out.writeObject(encrypt(dataToSave));
            out.close();
            fileOut.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }


    @SuppressWarnings("unchecked")
    public ArrayList<Account> loadData()
    {
        ArrayList<Account> loadedData = new ArrayList<Account>();
        File f = new File(Config.SERIAL_FILE);
        if (f.exists())
        {
            try
            {
                FileInputStream fileIn = new FileInputStream(Config.SERIAL_FILE);
                ObjectInputStream in = new ObjectInputStream(fileIn);
                loadedData = (ArrayList<Account>) in.readObject();
                in.close();
                fileIn.close();
            }
            catch (IOException | ClassNotFoundException e)
            {
                e.printStackTrace();
            }
            loadedData = decrypt(loadedData);
        }
        else
        {
            loadedData = new ArrayList<Account>();
        }
        return loadedData;
    }


    private ArrayList<Account> encrypt(List<Account> decrypted)
    {
        ArrayList<Account> encrypted = new ArrayList<Account>();

        try
        {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
            cipher = Cipher.getInstance("AES/CBC/NoPadding");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            for (int i = 0; i < decrypted.size(); i++)
            {
                try
                {
                    byte[] login = cipher.doFinal(Base64.getDecoder().decode(decrypted.get(i).getLogin().getBytes()));
                    encrypted.add(new Account(login.toString(), "pass"));
                }
                catch (Exception ex)
                {
                    ex.printStackTrace();
                }
            }
        }
        catch (InvalidKeyException | InvalidAlgorithmParameterException | UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        return encrypted;
    }


    private ArrayList<Account> decrypt(List<Account> encrypted)
    {
        ArrayList<Account> decrypted = new ArrayList<Account>();

        try
        {
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            cipher = Cipher.getInstance("AES/CBC/NoPadding");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);

            for (int i = 0; i < encrypted.size(); i++)
            {
                byte[] login = cipher.doFinal(Base64.getDecoder().decode(encrypted.get(i).getLogin()));
                decrypted.add(new Account(new String(login), "pass"));
            }
        }
        catch (InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException | UnsupportedEncodingException | NoSuchAlgorithmException | NoSuchPaddingException e)
        {
            e.printStackTrace();
        }
        return decrypted;
    }


    public static Move getMove()
    {
        if (instance == null)
        {
            instance = new Move();
        }
        return instance;
    }
}

Answer 1

AES块大小始终为128位，它必须以此数字的倍数接收输入。

必须将较小的输入填充为16个字节，并为算法指定填充类型。

使用“AES / CBC / PKCS5Padding”可以解决问题。

cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");

如果使用NoPadding，则必须实现自己的填充以进行加密，并确保在解密时从结果字符串中删除它。

javax.crypto.IllegalBlockSizeException：输入长度不是16个字节的倍数

1 个答案: