java - 解密加密的 .ser 文件并抛出 StreamCorruptedException

Question

我正在创建一个 .ser 文件，其中包含加密字符串及其解密 key 的映射。(我意识到这不是最好的方法，但我需要显示项目的不同加密方法)然后我对序列化的序列进行加密使用:

private void encryptKeysFile() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, IOException{
    SecretKey key64 = new SecretKeySpec( new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }, "Blowfish" );
    Cipher cipher = Cipher.getInstance( "Blowfish" );
    cipher.init( Cipher.ENCRYPT_MODE, key64 );
    File keysFile = new File(System.getProperty("src"),fileName);
    SealedObject sealedObject = new SealedObject(keysFile, cipher);
    CipherOutputStream cipherOutputStream = new CipherOutputStream( new BufferedOutputStream( new FileOutputStream(fileName) ), cipher );
    ObjectOutputStream outputStream = new ObjectOutputStream( cipherOutputStream );
    outputStream.writeObject(sealedObject);
    outputStream.close();
}

然后该对象被写回驱动器上的文件。 我用另一种方法读取文件并解密它:

private File dencryptKeysFile() throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, IOException, ClassNotFoundException, BadPaddingException{
    SecretKey key64 = new SecretKeySpec( new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07 }, "Blowfish" );
    Cipher cipher = Cipher.getInstance( "Blowfish" );
    cipher.init( Cipher.DECRYPT_MODE, key64 );
    CipherInputStream cipherInputStream = new CipherInputStream(new BufferedInputStream(new FileInputStream(fileName)),cipher);
    ObjectInputStream inputStream = new ObjectInputStream(cipherInputStream);
    SealedObject sealedObject = (SealedObject)inputStream.readObject();
    inputStream.close();

    File keysFile =(File)sealedObject.getObject(cipher);
    this.keysFile = keysFile;
    return keysFile;
}

运行这些方法时出现错误:

java.io.StreamCorruptedException: invalid stream header: E0F0DDB8
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.<init>(Unknown Source)
at mainClasses.Encrypter.dencryptKeysFile(Encrypter.java:180)
at mainClasses.Encrypter.main(Encrypter.java:214)

在文件未被读取时抛出。 加密器.java:180 = ObjectInputStream inputStream = new ObjectInputStream(cipherInputStream);

Answer 1

您正在使用相同的Cipher进行密封然后加密，这意味着加密是在密封后状态下使用Cipher进行的，然后您正在解密和解封与另一个Cipher，但是这次Cipher当然处于初始状态，而不是解封后状态，它只能在解封后才能达到，这永远不会发生。

您在这里使用腰带和背带。您不需要同时进行密封和密码流加密。使用其中之一。