I got the solution :)
i have download video from url using Download Manager and store file on public path. This is the code
public void downloadVideo(String url) {
Uri Download_Uri = Uri.parse(url);
DownloadManager.Request request = new DownloadManager.Request(Download_Uri);
//Restrict the types of networks over which this download may proceed.
request.setAllowedNetworkTypes(DownloadManager.Request.NETWORK_WIFI | DownloadManager.Request.NETWORK_MOBILE);
//Set whether this download may proceed over a roaming connection.
request.setAllowedOverRoaming(false);
// Visibility of the download Notification
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
//Set the title of this download, to be displayed in notifications (if enabled).
request.setTitle("Downloading");
//Set a description of this download, to be displayed in notifications (if enabled)
request.setDescription("Downloading File");
//Set the local destination for the downloaded file to a path within the application's external files directory
/*request.setDestinationInExternalFilesDir(MainActivity.this, Environment.DIRECTORY_MOVIES, "Shivam196.mp4");*/ //For private destination
//Set the local destination for the downloaded file to a path within the application's external files directory
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_MOVIES, "Shivam196.mp4"); // for public destination
DownloadManager downloadManager= (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
downloadID = downloadManager.enqueue(request);// enqueue puts the download request in the queue.
}
After successfully downloaded file, I have encrypt that file by passing file path on below method:
private void encryptFile(String filePath) throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException {
int read;
FileInputStream fis = new FileInputStream(new File(filePath));
File outfile = new File(Environment.getExternalStorageDirectory() + "/" + FOLDER_NAME + "/" + "test2_enc.mp4");
if(!outfile.exists())
outfile.createNewFile();
FileOutputStream fos = new FileOutputStream(outfile);
Cipher encipher = 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();
encipher.init(Cipher.ENCRYPT_MODE, skey);
CipherInputStream cis = new CipherInputStream(fis, encipher);
byte[] buffer = new byte[1024]; // buffer can read file line by line to increase speed
while((read = cis.read(buffer)) >= 0)
{
fos.write(buffer, 0, read);
fos.flush();
}
fos.close();
Toast.makeText(this, "File encrypted", Toast.LENGTH_SHORT).show();
//call method for decrypt file.
decryptFile(Environment.getExternalStorageDirectory() + "/" + FOLDER_NAME + "/" + "test_enc.mp4", skey);
}
And then decrypt the file by passing encrypted file path and secret key to below method:
private void decryptFile(String encryptFilePath, SecretKey secretKey) throws IOException, NoSuchPaddingException, NoSuchAlgorithmException, InvalidKeyException {
int read;
File outfile = new File(encryptFilePath);
File decfile = new File(Environment.getExternalStorageDirectory() + "/" + FOLDER_NAME + "/" + "test_dec.mp4");
if(!decfile.exists())
decfile.createNewFile();
FileOutputStream decfos = new FileOutputStream(decfile);
FileInputStream encfis = new FileInputStream(outfile);
Cipher decipher = Cipher.getInstance("AES");
decipher.init(Cipher.DECRYPT_MODE, secretKey);
CipherOutputStream cos = new CipherOutputStream(decfos,decipher);
byte[] buffer = new byte[1024]; // buffer can read file line by line to increase speed
while((read=encfis.read(buffer)) >= 0)
{
cos.write(buffer, 0, read);
cos.flush();
}
cos.close();
Toast.makeText(this, "File decrypted", Toast.LENGTH_SHORT).show();
}
Note: Perform encryption and description operation on background service.
