System.Collections.HashHelpers.GetEntropy C# (CSharp) Method

        internal static long GetEntropy()
        {
            lock (lockObj)
            {
                long ret;

                if (currentIndex == bufferSize)
                {
                    if (null == rng)
                    {
                        rng = RandomNumberGenerator.Create();
                        data = new byte[bufferSize];
                        Debug.Assert(bufferSize % 8 == 0, "We increment our current index by 8, so our buffer size must be a multiple of 8");
                    }

                    rng.GetBytes(data);
                    currentIndex = 0;
                }

                ret = BitConverter.ToInt64(data, currentIndex);
                currentIndex += 8;

                return ret;
            }
        }
#endif // FEATURE_RANDOMIZED_STRING_HASHING