C#

Open a Zip Archive

See more Zip Examples

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

bool success = false;

Chilkat.Zip zip = new Chilkat.Zip();

//  Open a non-encrypted .zip
success = zip.OpenZip("qa_data/zips/sample.zip");
if (success != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("Num entries = " + Convert.ToString(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";

success = zip.OpenZip("qa_data/zips/encryptedSamples/ziptest_256.zip");
if (success != true) {
    Debug.WriteLine(zip.LastErrorText);
    return;
}

Debug.WriteLine("Num entries = " + Convert.ToString(zip.NumEntries));

//  ...
//  ...

zip.CloseZip();