C#

public bool VerifySignature()
       {
           X509Certificate2 certificate = null;

           XmlDocument doc = new XmlDocument();
           XmlElement xmlAssertionElement = this.GetXml(doc);
           doc.AppendChild(xmlAssertionElement);

           // Create a new SignedXml object and pass it
           // the XML document class.
           SamlSignedXml signedXml = new SamlSignedXml(xmlAssertionElement);

           // Get signature
           XmlElement xmlSignature = this.Signature;
           if (xmlSignature == null)
           {
               return false;
           }

           // Load the signature node.
           signedXml.LoadXml(xmlSignature);

           // Get the certificate used to sign the assertion if information about this
           // certificate is available in the signature of the assertion.
           foreach (KeyInfoClause clause in signedXml.KeyInfo)
           {
               if (clause is KeyInfoX509Data)
               {
                   if (((KeyInfoX509Data)clause).Certificates.Count > 0)
                   {
                       certificate = (X509Certificate2)((KeyInfoX509Data)clause).Certificates[0];
                   }

               }
           }

           if (certificate == null)
           {
               return false;
           }

           return signedXml.CheckSignature(certificate, true);

       }

Harvey Saayman wrote:

Basically the server object creates a TcpListener in its own thread to listen for client connections

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