Swift

Convert ASN.1 to/from Binary DER, XML, and Base64

Demonstrates how to convert ASN.1 from and to any of the following formats: binary DER, Base64, and XML. Swift

func chilkatTest() {
    var success: Bool = false

    let asn = CkoAsn()!

    // Begin with loading ASN.1 from a binary DER/BER format file.
    success = asn.loadBinaryFile(path: "/Users/chilkat/testData/p7b/test.p7b")
    if success != true {
        print("\(asn.lastErrorText!)")
        return
    }

    // Convert ASN.1 to XML:
    var strXml: String? = asn.asnToXml()
    if asn.lastMethodSuccess != true {
        print("\(asn.lastErrorText!)")
        return
    }

    // The XML returned by AsnToXml will be compact and not pretty-formatted.
    // Use Chilkat XML to format the XML better:
    let xml = CkoXml()!
    success = xml.load(xmlData: strXml)
    // Assuming success for this example..
    // This is formatted better for human viewing:
    print("\(xml.getXml()!)")

    // Now get the ASN.1 in base64 format.  Any encoding supported
    // by Chilkat can be passed, such as "hex", "uu", "quoted-printable", "base32", "modbase64", etc.
    var strBase64: String? = asn.getEncodedDer(encoding: "base64")

    // Load the ASN.1 from XML:
    let asn2 = CkoAsn()!
    success = asn2.loadXml(xmlStr: xml.getXml())
    if success != true {
        print("\(asn2.lastErrorText!)")
        return
    }

    // Load the ASN.1 from an encoded string, such as base64:
    let asn3 = CkoAsn()!
    success = asn3.loadEncoded(asnContent: strBase64, encoding: "base64")
    if success != true {
        print("\(asn3.lastErrorText!)")
        return
    }


}