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(.NET Core C#) Create XAdES-T Signed XML

See more XAdES Examples

This example signs XML using the XAdES-T profile. XAdES-T is a profile within the XAdES standard that adds support for secure timestamping of signatures.

Secure timestamping involves adding a timestamp to the signature, indicating the exact time when the signature was applied.

Timestamping enhances the long-term validity of signatures by providing evidence that the signature existed at a specific point in time, even if the signer's certificate has expired or been revoked.

XAdES-T signatures include elements for embedding timestamp data within the XML signature, along with information about the timestamp authority and the timestamp verification process.

XAdES-T signatures are suitable for scenarios where long-term validity and integrity of signatures are essential, such as in legal and regulatory contexts where archived documents may need to be validated years or decades later.

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

bool success = true;
// Create the XML to be signed...

// Use this online tool to generate code from sample XML: 
// Generate Code to Create XML

// <?xml version="1.0" encoding="UTF-8"?>
// <es:Dossier xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns="http://uri.etsi.org/01903/v1.3.2#" xmlns:es="https://www.microsec.hu/ds/e-szigno30#" xsi:schemaLocation="https://www.microsec.hu/ds/e-szigno30# https://www.microsec.hu/ds/e-szigno30.xsd">
// 	<es:DossierProfile Id="PObject0" OBJREF="Object0">
// 	<es:Title>e-akta.es3</es:Title>
// 	<es:E-category>electronic dossier</es:E-category>
// 	<es:CreationDate>2022-12-02T07:55:16Z</es:CreationDate>
// 	</es:DossierProfile>
// 	<es:Documents Id="Object0"/>
// </es:Dossier>

Chilkat.Xml xmlToSign = new Chilkat.Xml();
xmlToSign.Tag = "es:Dossier";
xmlToSign.AddAttribute("xmlns:xsi","http://www.w3.org/2001/XMLSchema-instance");
xmlToSign.AddAttribute("xmlns:ds","http://www.w3.org/2000/09/xmldsig#");
xmlToSign.AddAttribute("xmlns","http://uri.etsi.org/01903/v1.3.2#");
xmlToSign.AddAttribute("xmlns:es","https://www.microsec.hu/ds/e-szigno30#");
xmlToSign.AddAttribute("xsi:schemaLocation","https://www.microsec.hu/ds/e-szigno30# https://www.microsec.hu/ds/e-szigno30.xsd");
xmlToSign.UpdateAttrAt("es:DossierProfile",true,"Id","PObject0");
xmlToSign.UpdateAttrAt("es:DossierProfile",true,"OBJREF","Object0");
xmlToSign.UpdateChildContent("es:DossierProfile|es:Title","e-akta.es3");
xmlToSign.UpdateChildContent("es:DossierProfile|es:E-category","electronic dossier");
xmlToSign.UpdateChildContent("es:DossierProfile|es:CreationDate","2022-12-02T07:55:16Z");
xmlToSign.UpdateAttrAt("es:Documents",true,"Id","Object0");

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

gen.SigLocation = "es:Dossier";
gen.SigLocationMod = 0;
gen.SigId = "S9fe8096e-2cac-415d-9222-f6cf2ecb314b";
gen.SigValueId = "VS9fe8096e-2cac-415d-9222-f6cf2ecb314b";
gen.SignedInfoId = "SIS9fe8096e-2cac-415d-9222-f6cf2ecb314b";
gen.SignedInfoCanonAlg = "EXCL_C14N";
gen.SignedInfoDigestMethod = "sha256";

// Set the KeyInfoId before adding references..
gen.KeyInfoId = "KS9fe8096e-2cac-415d-9222-f6cf2ecb314b";

// Create an Object to be added to the Signature.
Chilkat.Xml object1 = new Chilkat.Xml();
object1.Tag = "es:SignatureProfile";
object1.AddAttribute("Id","PS9fe8096e-2cac-415d-9222-f6cf2ecb314b");
object1.AddAttribute("OBJREF","Object0");
object1.AddAttribute("SIGREF","S9fe8096e-2cac-415d-9222-f6cf2ecb314b");
object1.AddAttribute("SIGREFLIST","#Object0 #PS9fe8096e-2cac-415d-9222-f6cf2ecb314b #PObject0 #XS9fe8096e-2cac-415d-9222-f6cf2ecb314b");
object1.UpdateChildContent("es:SignerName","EC MinsĂ­tett-Tesztel PĂ©terke");
object1.UpdateChildContent("es:SDPresented","false");
object1.UpdateChildContent("es:Type","signature");
object1.UpdateAttrAt("es:Generator|es:Program",true,"name","e-Szigno");
object1.UpdateAttrAt("es:Generator|es:Program",true,"version","3.3.6.8");
object1.UpdateAttrAt("es:Generator|es:Device",true,"name","OpenSSL 1.1.1n  15 Mar 2022");
object1.UpdateAttrAt("es:Generator|es:Device",true,"type","");

gen.AddObject("O1S9fe8096e-2cac-415d-9222-f6cf2ecb314b",object1.GetXml(),"","");

// Create an Object to be added to the Signature.
Chilkat.Xml object2 = new Chilkat.Xml();
object2.Tag = "QualifyingProperties";
object2.AddAttribute("Target","#S9fe8096e-2cac-415d-9222-f6cf2ecb314b");
object2.AddAttribute("Id","QPS9fe8096e-2cac-415d-9222-f6cf2ecb314b");
object2.UpdateAttrAt("SignedProperties",true,"Id","XS9fe8096e-2cac-415d-9222-f6cf2ecb314b");
object2.UpdateChildContent("SignedProperties|SignedSignatureProperties|SigningTime","TO BE GENERATED BY CHILKAT");
object2.UpdateAttrAt("SignedProperties|SignedSignatureProperties|SigningCertificateV2|Cert|CertDigest|ds:DigestMethod",true,"Algorithm","http://www.w3.org/2001/04/xmlenc#sha256");
object2.UpdateChildContent("SignedProperties|SignedSignatureProperties|SigningCertificateV2|Cert|CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT");
object2.UpdateChildContent("SignedProperties|SignedSignatureProperties|SigningCertificateV2|Cert|IssuerSerialV2","TO BE GENERATED BY CHILKAT");
object2.UpdateChildContent("SignedProperties|SignedSignatureProperties|SignaturePolicyIdentifier|SignaturePolicyImplied","");
object2.UpdateChildContent("SignedProperties|SignedSignatureProperties|SignerRoleV2|ClaimedRoles|ClaimedRole","tesztel");

// Here we have the EncapsulatedTimestamp found in the unsigned signature properties.
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|SignatureTimeStamp",true,"Id","T72cb4961-4326-4319-857a-7cf55e7ef899");
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|SignatureTimeStamp|ds:CanonicalizationMethod",true,"Algorithm","http://www.w3.org/2001/10/xml-exc-c14n#");
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|SignatureTimeStamp|EncapsulatedTimeStamp",true,"Id","ET72cb4961-4326-4319-857a-7cf55e7ef899");
object2.UpdateChildContent("UnsignedProperties|UnsignedSignatureProperties|SignatureTimeStamp|EncapsulatedTimeStamp","TO BE GENERATED BY CHILKAT");
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|TimeStampValidationData",true,"xmlns","http://uri.etsi.org/01903/v1.4.1#");
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|CertificateValues",true,"Id","CV18c7702d-d45b-44bc-853a-a720f41053cd");
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|CertificateValues|EncapsulatedX509Certificate",true,"Id","EC42db04c8-1422-407b-8c42-189353a55268");
object2.UpdateChildContent("UnsignedProperties|UnsignedSignatureProperties|CertificateValues|EncapsulatedX509Certificate","BASE64_CONTENT");
object2.UpdateAttrAt("UnsignedProperties|UnsignedSignatureProperties|CertificateValues|EncapsulatedX509Certificate[1]",true,"Id","EC04728b44-a32c-46c1-b9bb-85b1f6b3c7d3");
object2.UpdateChildContent("UnsignedProperties|UnsignedSignatureProperties|CertificateValues|EncapsulatedX509Certificate[1]","BASE64_CONTENT");

gen.AddObject("O2S9fe8096e-2cac-415d-9222-f6cf2ecb314b",object2.GetXml(),"","");

// -------- Reference 1 --------
gen.AddSameDocRef("Object0","sha256","EXCL_C14N","","");
gen.SetRefIdAttr("Object0","Re1f816c4-7898-4544-9b41-f4156dc0c528");

// -------- Reference 2 --------
gen.AddObjectRef("PS9fe8096e-2cac-415d-9222-f6cf2ecb314b","sha256","EXCL_C14N","","");
gen.SetRefIdAttr("PS9fe8096e-2cac-415d-9222-f6cf2ecb314b","Ra873b616-e568-4c38-ae94-27fbff67cc43");

// -------- Reference 3 --------
gen.AddSameDocRef("PObject0","sha256","EXCL_C14N","","");
gen.SetRefIdAttr("PObject0","Ra5d85948-5d6a-4914-8c32-242f5d6d9e81");

// -------- Reference 4 --------
gen.AddObjectRef("XS9fe8096e-2cac-415d-9222-f6cf2ecb314b","sha256","EXCL_C14N","","http://uri.etsi.org/01903#SignedProperties");
gen.SetRefIdAttr("XS9fe8096e-2cac-415d-9222-f6cf2ecb314b","Ra7412a43-dc05-4e0a-ac84-e9a070214757");

// Provide a certificate + private key. (PFX password is test123)
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

gen.SetX509Cert(cert,true);

gen.KeyInfoType = "X509Data";
gen.X509Type = "Certificate";

// -------------------------------------------------------------------------------------------
// To have the EncapsulatedTimeStamp automatically added, we only need to do 2 things.
// 1) Add the <xades:EncapsulatedTimeStamp Encoding="http://uri.etsi.org/01903/v1.2.2#DER">TO BE GENERATED BY CHILKAT</xades:EncapsulatedTimeStamp>
//    to the unsigned properties.
// 2) Specify the TSA URL (Timestamping Authority URL).
//    Here we specify the TSA URL:
// -------------------------------------------------------------------------------------------

Chilkat.JsonObject jsonTsa = new Chilkat.JsonObject();
jsonTsa.UpdateString("timestampToken.tsaUrl","http://timestamp.digicert.com");
jsonTsa.UpdateBool("timestampToken.requestTsaCert",true);
gen.SetTsa(jsonTsa);

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

gen.Behaviors = "IndentedSignature,OmitAlreadyDefinedSigNamespace";

// 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("c:/temp/qa_output/signedXml.xml","utf-8",false);

Debug.WriteLine(sbXml.GetAsString());

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

int numSigs = verifier.NumSignatures;
int verifyIdx = 0;
while (verifyIdx < numSigs) {
    verifier.Selector = verifyIdx;
    bool verified = verifier.VerifySignature(true);
    if (verified != true) {
        Debug.WriteLine(verifier.LastErrorText);
        return;
    }

    verifyIdx = verifyIdx + 1;
}

Debug.WriteLine("All signatures were successfully verified.");

 

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