Dart

Open a Zip Archive

See more Zip Examples

Demonstrates how to open a zip, or an encrypted .zip, or a legacy password-protected .zip. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final zip = CkZip();

  // Open a non-encrypted .zip
  try {
    zip.openZip('qa_data/zips/sample.zip');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Num entries = ${zip.numEntries}');

  // ...
  // ...

  zip.closeZip();

  // ----------------------------------------------------------------------------
  // Open an encrypted zip...

  // The two main types of encryption used in ZIP archives are Password-Protected and AES.
  // 

  // ---------------------------------------
  // 1. Legacy Password-Protected Zip
  // 
  // This is the older and less secure method of encrypting ZIP archives. 
  // It provides a basic level of security, but is considered weak by modern standards. 
  // It is vulnerable to various attacks, including known-plaintext attacks and brute force attacks.
  // Although Chilkat allows it, you shouldn't create new zip archives using legacy password-protection.

  // ---------------------------------------
  // 2. AES Encrypted Zip
  // 
  // AES encryption is a more modern and secure method for encrypting ZIP archives. 
  // It provides strong encryption based on the AES algorithm, which is widely regarded as secure. 
  // AES supports different key lengths, typically 128-bit, 192-bit, and 256-bit.

  // When opening an encrypted zip, your application only needs to provide the correct password.
  // The information about the type of encryption and the key length (if AES) is already embedded within the encrypted .zip.

  // Provide the decrypt password because we are opening an existing .zip (decrypting)
  zip.decryptPassword = 'thePassword';

  try {
    zip.openZip('qa_data/zips/encryptedSamples/ziptest_256.zip');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Num entries = ${zip.numEntries}');

  // ...
  // ...

  zip.closeZip();
}