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(VB.NET UWP/WinRT) Determine if a Zip is Encrypted or Password-Protected

Determines whether or not a zip archive is AES encrypted or password-protected.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

Dim zip As New Chilkat.Zip

Dim success As Boolean

'  Any string unlocks the component for the 1st 30-days.
success = zip.UnlockComponent("Anything for 30-day trial")
If (success <> True) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


'  An encrypted or password-protected zip can be opened
'  without specifying the password.  However, the contents
'  of the files cannot be unzipped without providing the correct
'  password.

success = Await zip.OpenZipAsync("something.zip")
If (success <> True) Then
    Debug.WriteLine(zip.LastErrorText)
    Exit Sub
End If


'  If the zip is password-protected, meaning that it uses
'  the old (insecure) Zip 2.0 encryption, then the
'  PasswordProtect property will be True
Dim bPwdProt As Boolean = zip.PasswordProtect
If (bPwdProt) Then
    Debug.WriteLine("This zip is password-protected.")
End If


'  If the zip is AES encrypted (WinZip compatible) then
'  the Encryption property will be equal to 4.
Dim encValue As Integer = zip.Encryption
If (encValue = 4) Then
    Debug.WriteLine("This zip is AES encrypted.")
End If


'  If the Encryption property = 0, then the zip is NOT
'  strong encrypted, and is either password-protected or
'  entirely unencrypted, depending on the value of the
'  PasswordProtect property.


zip.CloseZip()

 

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