System.Net.SSPIAuthType.DecryptMessage C# (CSharp) Method

        public unsafe int DecryptMessage(SafeDeleteContext context, ref Interop.SspiCli.SecBufferDesc inputOutput, uint sequenceNumber)
        {
            int status = (int)Interop.SECURITY_STATUS.InvalidHandle;
            uint qop = 0;

            try
            {
                bool ignore = false;
                context.DangerousAddRef(ref ignore);
                status = Interop.SspiCli.DecryptMessage(ref context._handle, ref inputOutput, sequenceNumber, &qop);
            }
            finally
            {
                context.DangerousRelease();
            }

            if (status == 0 && qop == Interop.SspiCli.SECQOP_WRAP_NO_ENCRYPT)
            {
                NetEventSource.Fail(this, $"Expected qop = 0, returned value = {qop}");
                throw new InvalidOperationException(SR.net_auth_message_not_encrypted);
            }

            return status;
        }