(C#) 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.
Chilkat.Xml xmlToSign = new Chilkat.Xml();
bool success = xmlToSign.LoadXmlFile("qa_data/fattura_electronica/docToSign.xml");
if (success != true) {
    Debug.WriteLine(xmlToSign.LastErrorText);
    return;
}

Chilkat.XmlDSigGen gen = new Chilkat.XmlDSigGen();

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.
Chilkat.Xml object1 = new Chilkat.Xml();
object1.Tag = "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:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod",true,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT");
object1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2","TO BE GENERATED BY CHILKAT");

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

// -------- Reference 1 --------
gen.KeyInfoId = "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
Chilkat.Cert cert = new Chilkat.Cert();

//  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.LoadFromSmartcard("");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

gen.SetX509Cert(cert,true);
gen.KeyInfoType = "X509Data";
gen.X509Type = "Certificate";

// Load XML to be signed...
Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder();
xmlToSign.GetXmlSb(sbXml);

gen.Behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform";

// Sign the XML...
success = gen.CreateXmlDSigSb(sbXml);
if (success != true) {
    Debug.WriteLine(gen.LastErrorText);
    return;
}

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

Debug.WriteLine(sbXml.GetAsString());

// ----------------------------------------
// Verify the signature we just produced...
Chilkat.XmlDSig verifier = new Chilkat.XmlDSig();
success = verifier.LoadSignatureSb(sbXml);
if (success != true) {
    Debug.WriteLine(verifier.LastErrorText);
    return;
}

bool verified = verifier.VerifySignature(true);
if (verified != true) {
    Debug.WriteLine(verifier.LastErrorText);
    return;
}

Debug.WriteLine("This signature was successfully verified.");