protected virtual bool AllowUnexpectedServerExtension(int extensionType, byte[] extensionData) { switch (extensionType) { case ExtensionType.supported_groups: /* * Exception added based on field reports that some servers do send this, although the * Supported Elliptic Curves Extension is clearly intended to be client-only. If * present, we still require that it is a valid EllipticCurveList. */ TlsEccUtilities.ReadSupportedEllipticCurvesExtension(extensionData); return(true); case ExtensionType.ec_point_formats: /* * Exception added based on field reports that some servers send this even when they * didn't negotiate an ECC cipher suite. If present, we still require that it is a valid * ECPointFormatList. */ TlsEccUtilities.ReadSupportedPointFormatsExtension(extensionData); return(true); default: return(false); } }