Classic ASP
Open a Zip Archive

Demonstrates how to open a zip, or an encrypted .zip, or a legacy password-protected .zip.
Chilkat Classic ASP Downloads

Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

set zip = Server.CreateObject("Chilkat.Zip")

' Open a non-encrypted .zip
success = zip.OpenZip("qa_data/zips/sample.zip")
If (success <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Num entries = " & zip.NumEntries) & "</pre>"

' ...
' ...

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 <> 1) Then
    Response.Write "<pre>" & Server.HTMLEncode( zip.LastErrorText) & "</pre>"
    Response.End
End If

Response.Write "<pre>" & Server.HTMLEncode( "Num entries = " & zip.NumEntries) & "</pre>"

' ...
' ...

zip.CloseZip 

%>
</body>
</html>