System.Net.Security.SslStreamPal.HandshakeInternal C# (CSharp) Method

        private static SecurityStatusPal HandshakeInternal(SafeFreeCredentials credential, ref SafeDeleteContext context,
            SecurityBuffer inputBuffer, SecurityBuffer outputBuffer, bool isServer, bool remoteCertRequired)
        {
            Debug.Assert(!credential.IsInvalid);

            try
            {
                if ((null == context) || context.IsInvalid)
                {
                    context = new SafeDeleteSslContext(credential as SafeFreeSslCredentials, isServer, remoteCertRequired);
                }

                byte[] output = null;
                int outputSize;
                bool done;

                if (null == inputBuffer)
                {
                    done = Interop.OpenSsl.DoSslHandshake(((SafeDeleteSslContext)context).SslContext, null, 0, 0, out output, out outputSize);
                }
                else
                {
                    done = Interop.OpenSsl.DoSslHandshake(((SafeDeleteSslContext)context).SslContext, inputBuffer.token, inputBuffer.offset, inputBuffer.size, out output, out outputSize);
                }

                outputBuffer.size = outputSize;
                outputBuffer.offset = 0;
                outputBuffer.token = outputSize > 0 ? output : null;

                return new SecurityStatusPal(done ? SecurityStatusPalErrorCode.OK : SecurityStatusPalErrorCode.ContinueNeeded);
            }
            catch (Exception exc)
            {
                return new SecurityStatusPal(SecurityStatusPalErrorCode.InternalError, exc);     
            }
        }