Create a 256-bit AES Encrypted Zip

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 1.0 / 1.1 Framework

Example program showing how to create a 256-bit AES Encrypted Zip using the Chilkat Zip .NET library.

        Dim zip As New Chilkat.Zip()

        ' Anything begins the 30-day trial
        Dim unlocked As Boolean
        unlocked = zip.UnlockComponent("30-day trial")
        If (Not unlocked) Then
            MsgBox("Failed to unlock Zip library")
            Exit Sub
        End If

        zip.NewZip("test.zip")

        ' Create the Zip with 256-bit AES encryption
        ' Set Encryption = 4 for WinZip compatible AES encryption
        ' Set Encryption = 3 for Chilkat-AES.  0 = no encryption, 1 - Chilkat-blowfish, 2 = Chilkat-twofish
        ' (Chilkat implemented strong-encrypted .zip files prior to WinZip, therefore
        ' the original Zip file format "extensions" for encryption values 1,2, and 3
        ' are specific to Chilkat Zip.  When AES encryption was introduced in WinZip,
        ' Chilkat followed by adding another setting (Encryption=4) to produces .zip
        ' archives that are compatible.)
        zip.Encryption = 4
        ' Key length can be 128-bit, 192-bit, or 256-bit
        zip.EncryptKeyLength = 256
        zip.SetPassword("myPassword")

        ' Append files to the AES Encrypted Zip.
        Dim success As Boolean
        zip.AppendFromDir = "c:/temp/something"
        ' Add the entire directory tree.
        success = zip.AppendFiles("*", True)
        If (Not success) Then
            MsgBox(zip.LastErrorText)
            Exit Sub
        End If

        ' Write the AES Encrypted Zip file.
        success = zip.WriteZipAndClose()
        If (Not success) Then
            MsgBox(zip.LastErrorText)
        Else
            MsgBox("Created AES Encrypted Zip!")
        End If

Important: The download for this example does not contain the ChilkatDotNet.dll which
must be downloaded and installed separately at http://www.chilkatsoft.com/downloads.asp.
Once installed, add a reference to the DLL in the project by following the instructions at
http://www.example-code.com/vbdotnet/step2.asp