(ctor) RDRand32()
      void _GetBytes( byte[] b )
      void _GetBytes( byte[] b, int offset, int count )
      void CheckSwap( int c )
      void Fill( object o )
      virtual bool IsSupported()
      virtual int Next( int c )
      virtual bool NextBool()
      byte NextByte()
      virtual void NextBytes( byte[] b )
      virtual double NextDouble()