(C# UWP/WinRT) Sign Italian SPID Metadata XML

Demonstrates how to create an XML digital signature for Italian SPID Metadata.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

bool success = true;

// Load the XML to be signed.
Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder();
success = sbXml.LoadFile("qa_data/xml_dsig/spid_metadata.xml","utf-8");
if (success == false) {
    Debug.WriteLine("Failed to load the input file.");
    return;
}

// The XML to sign contains XML such as this:

// <?xml version="1.0" encoding="utf-8"?>
// <md:EntityDescriptor xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" entityID="https://***.it" ID="_AE17AFFF-A600-49D5-B81D-76EEA55B50FF">
//     <md:SPSSODescriptor protocolSupportEnumeration="urn:oasis:names:tc:SAML:2.0:protocol" AuthnRequestsSigned="true" WantAssertionsSigned="true">
//         <md:KeyDescriptor use="signing">
//             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
//                 <ds:X509Data>
//                     <ds:X509Certificate>MIIF5...</ds:X509Certificate>
//                 </ds:X509Data>
//             </ds:KeyInfo>
//         </md:KeyDescriptor>
//         <md:KeyDescriptor use="encryption">
//             <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
//                 <ds:X509Data>
//                     <ds:X509Certificate>MIIF5...</ds:X509Certificate>
//                 </ds:X509Data>
//             </ds:KeyInfo>
//         </md:KeyDescriptor>
//         <md:SingleLogoutService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://***.it/it-it/spid/logout"/>
//         <md:NameIDFormat>urn:oasis:names:tc:SAML:2.0:nameid-format:transient</md:NameIDFormat>
//         <md:AssertionConsumerService Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://***.it/it-it/spid/loginresp" index="0" isDefault="true"/>
//         <md:AttributeConsumingService index="1">
//             <md:ServiceName xml:lang="it">Servizi Online</md:ServiceName>
//             <md:ServiceDescription xml:lang="it">Accesso ai Servizi Online</md:ServiceDescription>
//             <md:RequestedAttribute Name="spidCode" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
//             <md:RequestedAttribute Name="name" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
//             <md:RequestedAttribute Name="familyName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
//             <md:RequestedAttribute Name="fiscalNumber" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"/>
//         </md:AttributeConsumingService>
//     </md:SPSSODescriptor>
//     <md:Organization>
//         <md:OrganizationName xml:lang="it">SomeCompany s.r.l.</md:OrganizationName>
//         <md:OrganizationDisplayName xml:lang="it">SomeCompany s.r.l.</md:OrganizationDisplayName>
//         <md:OrganizationURL xml:lang="it">https://***.it</md:OrganizationURL>
//     </md:Organization>
// </md:EntityDescriptor>

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

gen.SigLocation = "md:EntityDescriptor|md:SPSSODescriptor";
gen.SigLocationMod = 2;
gen.SignedInfoCanonAlg = "EXCL_C14N";
gen.SignedInfoDigestMethod = "sha256";

// -------- Reference 1 --------
gen.AddSameDocRef("_AE17AFFF-A600-49D5-B81D-76EEA55B50FF","sha256","EXCL_C14N","","");

// 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+KeyValue";
gen.X509Type = "Certificate";

gen.Behaviors = "IndentedSignature,ForceAddEnvelopedSignatureTransform,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("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.");