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    copied!<p>I wrote a identification web page a while back that looked for a client certificate and if found would display the certificate information. I believe that is what you are looking for... Here is the page:</p> <pre><code>&lt;%@ Page Language="C#" Trace="false" %&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;%@ Import Namespace="System.Security.Cryptography.X509Certificates" %&gt; &lt;%@ Import Namespace="System.Security.Cryptography" %&gt; &lt;script runat="server"&gt; //protected void Page_Load(object sender, EventArgs e) //{ } void LoadCertInfo() { string para = "&lt;div style='margin: 10px 0 0 0; font-weight: bold'&gt;{0}&lt;/div&gt;"; string subpara = "&lt;div style='margin-left: 15px; font-size: 90%'&gt;{0}&lt;/div&gt;"; if (Page.Request.ClientCertificate.IsPresent) { Response.Write("&lt;hr /&gt;&lt;div style='width: 500px; margin: 20px auto'&gt;"); Response.Write("&lt;h3 style='width: 500px; margin: 20px auto'&gt;Client Certificate Information&lt;/h3&gt;"); try { X509Certificate2 x509Cert2 = new X509Certificate2(Page.Request.ClientCertificate.Certificate); Response.Write(string.Format(para, "Issued To:")); Response.Write(string.Format(subpara, x509Cert2.Subject)); Response.Write(string.Format(para, "Issued By:")); Response.Write(string.Format(subpara, x509Cert2.Issuer)); Response.Write(string.Format(para, "Friendly Name:")); Response.Write(string.Format(subpara, string.IsNullOrEmpty(x509Cert2.FriendlyName) ? "(None Specified)" : x509Cert2.FriendlyName)); Response.Write(string.Format(para, "Valid Dates:")); Response.Write(string.Format(subpara, "From: " + x509Cert2.GetEffectiveDateString())); Response.Write(string.Format(subpara, "To: " + x509Cert2.GetExpirationDateString())); Response.Write(string.Format(para, "Thumbprint:")); Response.Write(string.Format(subpara, x509Cert2.Thumbprint)); //Response.Write(string.Format(para, "Public Key:")); //Response.Write(string.Format(subpara, x509Cert2.GetPublicKeyString())); #region EKU Section - Retrieve EKU info and write out each OID X509EnhancedKeyUsageExtension ekuExtension = (X509EnhancedKeyUsageExtension)x509Cert2.Extensions["Enhanced Key Usage"]; if (ekuExtension != null) { Response.Write(string.Format(para, "Enhanced Key Usages (" + ekuExtension.EnhancedKeyUsages.Count.ToString() + " found)")); OidCollection ekuOids = ekuExtension.EnhancedKeyUsages; foreach (Oid ekuOid in ekuOids) Response.Write(string.Format(subpara, ekuOid.FriendlyName + " (OID: " + ekuOid.Value + ")")); } else { Response.Write(string.Format(para, "No EKU Section Data")); } #endregion // EKU Section #region Subject Alternative Name Section X509Extension sanExtension = (X509Extension)x509Cert2.Extensions["Subject Alternative Name"]; if (sanExtension != null) { Response.Write(string.Format(para, "Subject Alternative Name:")); Response.Write(string.Format(subpara, sanExtension.Format(true))); } else { Response.Write(string.Format(para, "No Subject Alternative Name Data")); } #endregion // Subject Alternative Name Section #region Certificate Policies Section X509Extension policyExtension = (X509Extension)x509Cert2.Extensions["Certificate Policies"]; if (policyExtension != null) { Response.Write(string.Format(para, "Certificate Policies:")); Response.Write(string.Format(subpara, policyExtension.Format(true))); } else { Response.Write(string.Format(para, "No Certificate Policies Data")); } #endregion //Certificate Policies Section // Example on how to enumerate all extensions //foreach (X509Extension extension in x509Cert2.Extensions) // Response.Write(string.Format(para, extension.Oid.FriendlyName + "(" + extension.Oid.Value + ")")); } catch (Exception ex) { Response.Write(string.Format(para, "An error occured:")); Response.Write(string.Format(subpara, ex.Message)); Response.Write(string.Format(subpara, ex.StackTrace)); } finally { Response.Write("&lt;/div&gt;"); } } } &lt;/script&gt; &lt;html&gt; &lt;head runat="server"&gt; &lt;title&gt;&lt;% Page.Response.Write(System.Environment.MachineName); %&gt;&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;% LoadCertInfo(); %&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
 

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