//returns a uniformly random ulong between ulong.Min inclusive and ulong.Max inclusive
public static ulong NextULong(this Random Rng)
{
byte[] buf = new byte[8];
Rng.NextBytes(buf);
return(BitConverter.ToUInt64(buf, 0));
}
public static byte[] GetRandomByteArray(Random random, int size)
{
byte[] value = new byte[size];
random.NextBytes(value);
return(value);
}