Working with the PRNG device driver

Red Hat Enterprise Linux 9.2 LPAR mode z/VM guest KVM guest

Read random numbers and control the settings of the PRNG device driver.

Reading pseudo-random numbers
The pseudo-random number device is read-only. Use the read function, cat program, or dd program to obtain random numbers.
Displaying PRNG information
Read the attributes of the prandom device in sysfs.
Setting the reseed limit
The PRNG reseeds after chunksize × reseed_limit bytes are read. By default, 100000 × 256 ≈ 25.6 MB can be read before an automatic reseed occurs.
Reseeding the PRNG
You can force a reseed by writing to the reseed attribute.

Parent topic: Pseudorandom number generator device driver