Xojo Plugin

Determine if a Zip is Encrypted or Password-Protected

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

Dim success As Boolean
success = False

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Dim zip As New Chilkat.Zip

// 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 = zip.OpenZip("something.zip")
If (success <> True) Then
    System.DebugLog(zip.LastErrorText)
    Return
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
bPwdProt = zip.PasswordProtect
If (bPwdProt) Then
    System.DebugLog("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 Int32
encValue = zip.Encryption
If (encValue = 4) Then
    System.DebugLog("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