(Swift 3,4,5...) Create XAdES using Smart Card or USB Token

Demonstrates how to create an XAdES signed XML document using a certificate located on a smartcard or USB token.

Note: This example requires Chilkat v9.5.0.75 or greater. Also, at the time of this writing this example is restricted to the Windows operating system.

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func chilkatTest() {
    // ----------------------------------------------------------------------
    // IMPORTANT: This generated example requires Chilkat v9.5.0.75 or later.
    // Contact support@chilkatsoft.com for a pre-release.
    // ----------------------------------------------------------------------

    // Load the XML to be signed.
    let xmlToSign = CkoXml()!
    var success: Bool = xmlToSign.loadFile("qa_data/fattura_electronica/docToSign.xml")
    if success != true {
        print("\(xmlToSign.lastErrorText!)")
        return
    }

    let gen = CkoXmlDSigGen()!

    gen.sigLocation = "p:FatturaElettronica"
    gen.sigId = "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504"
    gen.sigNamespacePrefix = "ds"
    gen.sigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
    gen.sigValueId = "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-sigvalue"
    gen.signedInfoCanonAlg = "C14N"
    gen.signedInfoDigestMethod = "sha256"

    // Create an Object to be added to the Signature.
    // Note: Chilkat will automatically populate the strings indicated by "TO BE GENERATED BY CHILKAT" with actual/correct values
    // when the XML is signed.
    let object1 = CkoXml()!
    object1.tag = "xades:QualifyingProperties"
    object1.addAttribute("xmlns:xades", value: "http://uri.etsi.org/01903/v1.3.2#")
    object1.addAttribute("xmlns:xades141", value: "http://uri.etsi.org/01903/v1.4.1#")
    object1.addAttribute("Target", value: "#xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504")
    object1.updateAttr(at: "xades:SignedProperties", autoCreate: true, attrName: "Id", attrValue: "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops")
    object1.updateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime", value: "TO BE GENERATED BY CHILKAT")
    object1.updateAttr(at: "xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod", autoCreate: true, attrName: "Algorithm", attrValue: "http://www.w3.org/2001/04/xmlenc#sha256")
    object1.updateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue", value: "TO BE GENERATED BY CHILKAT")
    object1.updateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2", value: "TO BE GENERATED BY CHILKAT")

    gen.addObject("", content: object1.getXml(), mimeType: "", encoding: "")

    // -------- Reference 1 --------
    gen.keyInfoId = "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo"
    gen.addSameDocRef("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo", digestMethod: "sha256", canonMethod: "", prefixList: "", refType: "")

    // -------- Reference 2 --------
    gen.addSameDocRef("", digestMethod: "sha256", canonMethod: "", prefixList: "", refType: "")
    gen.setRefIdAttr("", value: "xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-ref0")

    // -------- Reference 3 --------
    gen.addObjectRef("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops", digestMethod: "sha256", canonMethod: "", prefixList: "", refType: "http://uri.etsi.org/01903#SignedProperties")

    // ----------------------------------------------------------------
    //  Load a certificate that has been pre-installed on the Windows system
    //  This includes certificates on smartcards and USB tokens
    let cert = CkoCert()!

    //  You may provide the PIN here..
    cert.smartCardPin = "000000"

    // Load the certificate on the smartcard currently in the reader (or on the USB token).
    // Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
    // See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
    success = cert.load(fromSmartcard: "")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    gen.setX509Cert(cert, usePrivateKey: true)
    gen.keyInfoType = "X509Data"
    gen.x509Type = "Certificate"

    // Load XML to be signed...
    let sbXml = CkoStringBuilder()!
    xmlToSign.getSb(sbXml)

    gen.behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform"

    // Sign the XML...
    success = gen.createXmlDSigSb(sbXml)
    if success != true {
        print("\(gen.lastErrorText!)")
        return
    }

    // Save the signed XMl to a file.
    success = sbXml.writeFile("qa_output/signedXml.xml", charset: "utf-8", emitBom: false)

    print("\(sbXml.getAsString()!)")

    // ----------------------------------------
    // Verify the signature we just produced...
    let verifier = CkoXmlDSig()!
    success = verifier.loadSignatureSb(sbXml)
    if success != true {
        print("\(verifier.lastErrorText!)")
        return
    }

    var verified: Bool = verifier.verifySignature(true)
    if verified != true {
        print("\(verifier.lastErrorText!)")
        return
    }

    print("This signature was successfully verified.")

}