How can I encrypt video file using Dart?

Here is the solution that I found. Hope it helps. Remember to add the package encryption package to pubspec.yaml

import 'dart:convert';import 'dart:io';import 'package:encrypt/encrypt.dart';main() {  perfomEncryptionTasks();}perfomEncryptionTasks() async {  await encryptFile();  await decryptFile();}encryptFile() async {  File inFile = new File("video.mp4");  File outFile = new File("videoenc.aes");  bool outFileExists = await outFile.exists();  if(!outFileExists){    await outFile.create();  }  final videoFileContents = await inFile.readAsStringSync(encoding: latin1);  final key = Key.fromUtf8('my 32 length key................');  final iv = IV.fromLength(16);  final encrypter = Encrypter(AES(key));  final encrypted = encrypter.encrypt(videoFileContents, iv: iv);  await outFile.writeAsBytes(encrypted.bytes);}decryptFile() async {  File inFile = new File("videoenc.aes");  File outFile = new File("videodec.mp4");  bool outFileExists = await outFile.exists();  if(!outFileExists){    await outFile.create();  }  final videoFileContents = await inFile.readAsBytesSync();  final key = Key.fromUtf8('my 32 length key................');  final iv = IV.fromLength(16);  final encrypter = Encrypter(AES(key));  final encryptedFile = Encrypted(videoFileContents);  final decrypted = encrypter.decrypt(encryptedFile, iv: iv);  final decryptedBytes = latin1.encode(decrypted);  await outFile.writeAsBytes(decryptedBytes);}