X509Certificate2 Subject Alternative Names Extension Method

SubjectAlternativeNames

public static List<string> GetSubjectAlternativeNames(this X509Certificate2 certificate)
        {
            foreach (X509Extension extension in certificate.Extensions)
            {
                // Create an AsnEncodedData object using the extensions information.
                AsnEncodedData asndata = new AsnEncodedData(extension.Oid, extension.RawData);
                if (string.Equals(extension.Oid.FriendlyName, "Subject Alternative Name"))
                {
                    //Console.WriteLine("Extension type: {0}", extension.Oid.FriendlyName);
                    //Console.WriteLine("Oid value: {0}", asndata.Oid.Value);
                    //Console.WriteLine("Raw data length: {0} {1}", asndata.RawData.Length, Environment.NewLine);
                    //Console.WriteLine(asndata.Format(true));

                    return new List<string>(
                        asndata.Format(true).Split(new string[] { "\r\n", "DNS Name=" },
                             StringSplitOptions.RemoveEmptyEntries));
                }

            }
            return new List<string>();
        }