Do note that "exhausting the system's entropy pool" is a myth - entropy can't run out. In the bad old days, Linux kernel developers believed the myth and /dev/random would block if the kernel thought that entropy was low, but most applications (including crypto/rand) read from the non-blocking /dev/urandom instead. See https://www.2uo.de/myths-about-urandom/ for details. So don't let that stop you from using crypto/rand.Read!
