System.Net.Security.NegotiateStreamPal.EstablishSecurityContext C# (CSharp) Метод

        private static SecurityStatusPal EstablishSecurityContext(
          SafeFreeNegoCredentials credential,
          ref SafeDeleteContext context,
          string targetName,
          ContextFlagsPal inFlags,
          SecurityBuffer inputBuffer,
          SecurityBuffer outputBuffer,
          ref ContextFlagsPal outFlags)
        {
            bool isNtlmOnly = credential.IsNtlmOnly;

            if (context == null)
            {
                // Empty target name causes the failure on Linux, hence passing a non-empty string  
                context = isNtlmOnly ? new SafeDeleteNegoContext(credential, credential.UserName) : new SafeDeleteNegoContext(credential, targetName);
            }

            SafeDeleteNegoContext negoContext = (SafeDeleteNegoContext)context;
            try
            {
                Interop.NetSecurityNative.GssFlags inputFlags = ContextFlagsAdapterPal.GetInteropFromContextFlagsPal(inFlags, isServer: false);
                uint outputFlags;
                int isNtlmUsed;
                SafeGssContextHandle contextHandle = negoContext.GssContext;
                bool done = GssInitSecurityContext(
                   ref contextHandle,
                   credential.GssCredential,
                   isNtlmOnly,
                   negoContext.TargetName,
                   inputFlags,
                   inputBuffer?.token,
                   out outputBuffer.token,
                   out outputFlags,
                   out isNtlmUsed);

                Debug.Assert(outputBuffer.token != null, "Unexpected null buffer returned by GssApi");
                outputBuffer.size = outputBuffer.token.Length;
                outputBuffer.offset = 0;
                outFlags = ContextFlagsAdapterPal.GetContextFlagsPalFromInterop((Interop.NetSecurityNative.GssFlags)outputFlags, isServer: false);
                Debug.Assert(negoContext.GssContext == null || contextHandle == negoContext.GssContext);

                // Save the inner context handle for further calls to NetSecurity
                Debug.Assert(negoContext.GssContext == null || contextHandle == negoContext.GssContext);
                if (null == negoContext.GssContext)
                {
                    negoContext.SetGssContext(contextHandle);
                }

                // Populate protocol used for authentication
                if (done)
                {
                    negoContext.SetAuthenticationPackage(Convert.ToBoolean(isNtlmUsed));
                }

                SecurityStatusPalErrorCode errorCode = done ?
                    (negoContext.IsNtlmUsed && outputBuffer.size > 0 ? SecurityStatusPalErrorCode.OK : SecurityStatusPalErrorCode.CompleteNeeded) :
                    SecurityStatusPalErrorCode.ContinueNeeded;
                return new SecurityStatusPal(errorCode);
            }
            catch (Exception ex)
            {
                if (NetEventSource.IsEnabled) NetEventSource.Error(null, ex);
                return new SecurityStatusPal(SecurityStatusPalErrorCode.InternalError, ex);
            }
        }