(Go) 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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    // ----------------------------------------------------------------------
    // 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.
    xmlToSign := chilkat.NewXml()
    success := xmlToSign.LoadXmlFile("qa_data/fattura_electronica/docToSign.xml")
    if success != true {
        fmt.Println(xmlToSign.LastErrorText())
        xmlToSign.DisposeXml()
        return
    }

    gen := chilkat.NewXmlDSigGen()

    gen.SetSigLocation("p:FatturaElettronica")
    gen.SetSigId("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504")
    gen.SetSigNamespacePrefix("ds")
    gen.SetSigNamespaceUri("http://www.w3.org/2000/09/xmldsig#")
    gen.SetSigValueId("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-sigvalue")
    gen.SetSignedInfoCanonAlg("C14N")
    gen.SetSignedInfoDigestMethod("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.
    object1 := chilkat.NewXml()
    object1.SetTag("xades:QualifyingProperties")
    object1.AddAttribute("xmlns:xades","http://uri.etsi.org/01903/v1.3.2#")
    object1.AddAttribute("xmlns:xades141","http://uri.etsi.org/01903/v1.4.1#")
    object1.AddAttribute("Target","#xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504")
    object1.UpdateAttrAt("xades:SignedProperties",true,"Id","xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops")
    object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime","TO BE GENERATED BY CHILKAT")
    object1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestMethod",true,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256")
    object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT")
    object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509IssuerName","TO BE GENERATED BY CHILKAT")
    object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificate|xades:Cert|xades:IssuerSerial|ds:X509SerialNumber","TO BE GENERATED BY CHILKAT")

    gen.AddObject("",*object1.GetXml(),"","")

    // -------- Reference 1 --------
    gen.SetKeyInfoId("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo")
    gen.AddSameDocRef("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-keyinfo","sha256","","","")

    // -------- Reference 2 --------
    gen.AddSameDocRef("","sha256","","","")
    gen.SetRefIdAttr("","xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-ref0")

    // -------- Reference 3 --------
    gen.AddObjectRef("xmldsig-6f4b994a-7191-4bb1-ab3c-17549515b504-signedprops","sha256","","","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
    cert := chilkat.NewCert()

    //  You may provide the PIN here..
    cert.SetSmartCardPin("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.LoadFromSmartcard("")
    if success != true {
        fmt.Println(cert.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        object1.DisposeXml()
        cert.DisposeCert()
        return
    }

    gen.SetX509Cert(cert,true)
    gen.SetKeyInfoType("X509Data")
    gen.SetX509Type("Certificate")

    // Load XML to be signed...
    sbXml := chilkat.NewStringBuilder()
    xmlToSign.GetXmlSb(sbXml)

    gen.SetBehaviors("IndentedSignature,ForceAddEnvelopedSignatureTransform")

    // Sign the XML...
    success = gen.CreateXmlDSigSb(sbXml)
    if success != true {
        fmt.Println(gen.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        object1.DisposeXml()
        cert.DisposeCert()
        sbXml.DisposeStringBuilder()
        return
    }

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

    fmt.Println(*sbXml.GetAsString())

    // ----------------------------------------
    // Verify the signature we just produced...
    verifier := chilkat.NewXmlDSig()
    success = verifier.LoadSignatureSb(sbXml)
    if success != true {
        fmt.Println(verifier.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        object1.DisposeXml()
        cert.DisposeCert()
        sbXml.DisposeStringBuilder()
        verifier.DisposeXmlDSig()
        return
    }

    verified := verifier.VerifySignature(true)
    if verified != true {
        fmt.Println(verifier.LastErrorText())
        xmlToSign.DisposeXml()
        gen.DisposeXmlDSigGen()
        object1.DisposeXml()
        cert.DisposeCert()
        sbXml.DisposeStringBuilder()
        verifier.DisposeXmlDSig()
        return
    }

    fmt.Println("This signature was successfully verified.")

    xmlToSign.DisposeXml()
    gen.DisposeXmlDSigGen()
    object1.DisposeXml()
    cert.DisposeCert()
    sbXml.DisposeStringBuilder()
    verifier.DisposeXmlDSig()