Microsoft.Protocols.TestTools.StackSdk.RemoteDesktop.Rdpbcgr.RdpbcgrDecoder.ParseTsUdScSec1 C# (CSharp) Method

        private TS_UD_SC_SEC1 ParseTsUdScSec1(byte[] data, ref int currentIndex)
        {
            TS_UD_SC_SEC1 secData = new TS_UD_SC_SEC1();

            // reserve the start index
            int startIndex = currentIndex;

            // TS_UD_SC_SEC1: header
            secData.header.type = (TS_UD_HEADER_type_Values)ParseUInt16(data, ref currentIndex, false);
            secData.header.length = ParseUInt16(data, ref currentIndex, false);

            // caculate the end index
            int dataEndIndex = secData.header.length + startIndex;

            // TS_UD_SC_SEC1: encryptionMethod
            secData.encryptionMethod = (EncryptionMethods)ParseUInt32(data, ref currentIndex, false);

            // TS_UD_SC_SEC1: encryptionLevel
            secData.encryptionLevel = (EncryptionLevel)ParseUInt32(data, ref currentIndex, false);

            // TS_UD_SC_SEC1: optional data fields (which can be present/absent)
            if (currentIndex < dataEndIndex)
            {
                // TS_UD_SC_SEC1: serverRandomLen (present)
                secData.serverRandomLen = new UInt32Class(ParseUInt32(data, ref currentIndex, false));

                // TS_UD_SC_SEC1: serverCertLen (present)
                secData.serverCertLen = new UInt32Class(ParseUInt32(data, ref currentIndex, false));

                // TS_UD_SC_SEC1: serverRandom (present)
                secData.serverRandom = GetBytes(data, ref currentIndex, (int)secData.serverRandomLen.actualData);

                // TS_UD_SC_SEC1: serverCertificate (present)
                secData.serverCertificate = new SERVER_CERTIFICATE();

                // TS_UD_SC_SEC1: serverCertificate: dwVersion
                secData.serverCertificate.dwVersion =
                    (SERVER_CERTIFICATE_dwVersion_Values)ParseUInt32(data, ref currentIndex, false);

                // TS_UD_SC_SEC1: serverCertificate: certData
                if (SERVER_CERTIFICATE_dwVersion_Values.CERT_CHAIN_VERSION_1 == secData.serverCertificate.dwVersion)
                {
                    // proprietary server certificate
                    secData.serverCertificate.certData = ParseProprietaryServerCertificate(data, ref currentIndex);
                }
                else
                {
                    // X509 certificate chain
                    secData.serverCertificate.certData =
                        ParseX509CertificateChain(data, ref currentIndex, (dataEndIndex - currentIndex));
                }
            }
            else
            {
                // TS_UD_SC_SEC1: serverRandomLen (absent)
                secData.serverRandomLen = null;

                // TS_UD_SC_SEC1: serverCertLen (absent)
                secData.serverCertLen = null;

                // TS_UD_SC_SEC1: serverRandom (absent)
                secData.serverRandom = null;

                // TS_UD_SC_SEC1: serverCertificate (absent)
                secData.serverCertificate = null;
            }
            return secData;
        }