如何在视频视图中播放加密视频而不解密

Question

In my app i want to play video with encryption, for security purpose that the video could not played by other app.I already encrypt and decrypt video and saved in external storage but I can't play it.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Button encryptButton = (Button) findViewById(R.id.button);

    encryptButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            try {
                encrypt();
                Toast.makeText(getApplicationContext(), " Encryption complete ",
                        Toast.LENGTH_SHORT).show();
            }catch (InvalidKeyException e){
                e.printStackTrace();
            }catch (NoSuchPaddingException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
            }
        }
    });

}

static void encrypt() throws IOException, NoSuchAlgorithmException,
        NoSuchPaddingException, InvalidKeyException{
    FileInputStream fis = new FileInputStream(new File("/storage/emulated/0/DCIM/Camera/VID_20140217_144346.mp4"));
    File outfile = new File("/storage/emulated/0/DCIM/Camera/encrypt.mp4");
    int read;
    if(!outfile.exists())
        outfile.createNewFile();
    File decfile = new File("/storage/emulated/0/DCIM/Camera/decrypt.mp4");
    if(!decfile.exists())
        decfile.createNewFile();
    FileOutputStream fos = new FileOutputStream(outfile);
    FileInputStream encfis = new FileInputStream(outfile);
    FileOutputStream decfos = new FileOutputStream(decfile);
    Cipher encipher = Cipher.getInstance("AES");
    Cipher decipher = Cipher.getInstance("AES");
    KeyGenerator kgen = KeyGenerator.getInstance("AES");
    //byte key[] = {0x00,0x32,0x22,0x11,0x00,0x00,0x00,0x00,0x00,0x23,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
    SecretKey skey = kgen.generateKey();
    //Lgo
    encipher.init(Cipher.ENCRYPT_MODE, skey);
    CipherInputStream cis = new CipherInputStream(fis, encipher);
    decipher.init(Cipher.DECRYPT_MODE, skey);
    CipherOutputStream cos = new CipherOutputStream(decfos,decipher);
    while((read = cis.read())!=-1)
    {
        fos.write((char)read);
        fos.flush();
    }
    fos.close();
    while((read=encfis.read())!=-1)
    {
        cos.write(read);
        cos.flush();
    }
    cos.close();
}

I want when that button clicked that video encrypt and play that video. That video can played only inside the app. I search many thing but can't understand properly. Please help me. Thanks.

Answer 1

Hello Here is a third party library to play encrypted videos on the fly.

http://libeasy.alwaysdata.net/network/#encoding

It make the local server and serve the frames of video in chunks to the Videoview. For now I only found this library that suits your requirement.