(.NET Core C#) Get Certificates within XML Signature

Demonstrates how to get the certificates contained within an XML signature.

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

Chilkat.StringBuilder sbXml = new Chilkat.StringBuilder();

// Load XML containing one or more signatures.
bool success = sbXml.LoadFile("qa_data/xml_dsig_valid_samples/multipleSigners/sp.pdf.XAdES.xml","utf-8");
if (success == false) {
    Debug.WriteLine("Failed to load the XML file..");
    return;
}

Chilkat.XmlDSig dsig = new Chilkat.XmlDSig();

// First load the XML containing the signatures to be verified.
// Note that this particular Signature already contains the RSA public key that will be used
// for verification.
success = dsig.LoadSignatureSb(sbXml);
if (success != true) {
    Debug.WriteLine(dsig.LastErrorText);
    return;
}

// For each signature, verify and also get the certificate(s) contained within each Signature.
int i = 0;
Chilkat.StringArray saCerts = new Chilkat.StringArray();
Chilkat.Cert cert = new Chilkat.Cert();

Debug.WriteLine("numSignatures = " + Convert.ToString(dsig.NumSignatures));

while (i < dsig.NumSignatures) {
    // Select the Nth signature by setting the Selector property.
    dsig.Selector = i;

    bool bVerifyReferenceDigests = true;
    bool bVerified = dsig.VerifySignature(bVerifyReferenceDigests);
    Debug.WriteLine("Signature " + Convert.ToString(i + 1) + " verified = " + Convert.ToString(bVerified));

    // Get the certificates embedded in this signature.
    saCerts.Clear();
    success = dsig.GetCerts(saCerts);
    if (success == true) {
        int j = 0;
        while (j < saCerts.Count) {
            success = cert.LoadFromBase64(saCerts.GetString(j));
            if (success == true) {
                Debug.WriteLine("    " + cert.SubjectDN);
            }

            j = j + 1;
        }

    }

    i = i + 1;
}