(Swift 3,4,5...) Determine if a Zip is Encrypted or Password-Protected

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

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

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

    let zip = CkoZip()!

    // 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.

    var success: Bool = zip.open("something.zip")
    if success != true {
        print("\(zip.lastErrorText!)")
        return
    }

    // If the zip is password-protected, meaning that it uses
    // the old (insecure) Zip 2.0 encryption, then the
    // PasswordProtect property will be true
    var bPwdProt: Bool = zip.passwordProtect
    if bPwdProt {
        print("This zip is password-protected.")
    }

    // If the zip is AES encrypted (WinZip compatible) then
    // the Encryption property will be equal to 4.
    var encValue: Int = zip.encryption.intValue
    if encValue == 4 {
        print("This zip is AES encrypted.")
    }

    // 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.close()

}