(Swift 3,4,5...) Use a Custom Set of Trusted Root Certificates

Demonstrates how to build a set of trusted root certificates to be used globally by all Chilkat classes.

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

    let trustedRoots = CkoTrustedRoots()!

    //  Indicate that we will NOT trust any pre-installed certificates on the system.
    trustedRoots.trustSystemCaRoots = false

    // Thawte is a certificate authority that provides a .zip download of their
    // root CA certificates:  https://www.thawte.com/roots/index.html
    // The direct download link is: https://www.verisign.com/support/thawte-roots.zip
    // Note: The above URLs are valid at the time of writing this example (29-May-2015).

    // Assuming the .zip has already been downloaded, open it and load each .pem file into
    // our trusted roots object.
    let zip = CkoZip()!

    // Open a .zip containing PEM files, among other things..
    var success: Bool = zip.open("qa_data/certs/thawte-roots.zip")
    if success != true {
        print("\(zip.lastErrorText!)")
        return
    }

    var entry: CkoZipEntry? = zip.first(matchingEntry: "*.pem")
    if zip.lastMethodSuccess != true {
        print("No entries matched.")
        return
    }

    var nextEntry: CkoZipEntry?
    var pemStr: String?

    let cert = CkoCert()!

    var bHasMoreEntries: Bool = true
    while (bHasMoreEntries == true) {

        print("Entry: \(entry!.fileName!)")

        // Get the PEM of the CA cert:
        pemStr = entry!.unzip(toString: 0, srcCharset: "utf-8")

        // Load it into a certificate object:
        success = cert.loadPem(pemStr)
        if success != true {
            print("\(cert.lastErrorText!)")
        }

        // Add it to the trusted roots.
        trustedRoots.add(cert)

        // The NextMatchingEntry method was added in v9.5.0.50
        nextEntry = entry!.next(matchingEntry: "*.pem")
        bHasMoreEntries = entry!.lastMethodSuccess

        entry = nil
        entry = nextEntry
    }

    //  Activate the trusted roots globally for all Chilkat objects.
    //  This call really shouldn't fail, so we're not checking the return value.
    success = trustedRoots.activate()

}