I am trying to encrypt image by doing this :

Uint8List generateRandomKey() {
    final random = Random.secure();
    final key = List<int>.generate(32, (_) => random.nextInt(256));
    return Uint8List.fromList(key);
  }

void encryptFileOk(File inputFile) {
    Uint8List enkripppKey = generateRandomKey();

    final cipher = pc.BlockCipher('AES')
      ..init(true, pc.KeyParameter(enkripppKey));
    final inputBytes = inputFile.readAsBytesSync();
    print("halo1 data awal $inputBytes");
    final encryptedBytes = cipher.process(Uint8List.fromList(inputBytes));
    // outputFile.writeAsBytesSync(encryptedBytes);
    print("halo1 encryptedBytes $encryptedBytes");
    decryptFile(encryptedBytes, enkripppKey);
  }

and for decrypt :

void decryptFile(Uint8List dummm, Uint8List enkripppKey) {
    final cipher = pc.BlockCipher('AES')
      ..init(false, pc.KeyParameter(enkripppKey));
    final encryptedBytes = dummm; //encryptedFile.readAsBytesSync();
    final decryptedBytes = cipher.process(Uint8List.fromList(encryptedBytes));
    print("halo1 decryptedBytes $decryptedBytes");
    // decryptedFile.writeAsBytesSync(decryptedBytes);
  }

I follow the step from this https://medium.com/@buddi/how-to-encrypt-a-file-in-flutter-4605e2fb8aec

but when I compare between print(“halo1 data awal $inputBytes”); and print(“halo1 decryptedBytes $decryptedBytes”);, the result is always different. I think it should be the same for inputBytes and decryptedBytes. And also the data in inputBytes has a long list of Uint8list but after doing encrypt, the list of Uint8list become shorter. Is there any documentation or information that I can read for doing encrypt and decrypt in flutter