RNDCTL(8) NetBSD System Manager's Manual RNDCTL(8)
rndctl -- kernel entropy pool management tool
rndctl [-CcEe] [-d devname | -t devtype] rndctl [-lsv] [-d devname | -t devtype] rndctl [-i] -L save-file rndctl -S save-file
The rndctl program displays statistics on the current state of the rnd(4) device, and controls which sources are allowed to contribute to the entropy pool maintained by rnd(4). The following options are available: -C Disable collection of timing information for the given device name or device type. -c Enable collection of timing information for the given device name or device type. -d Only the device named devname is altered or displayed. This is mutually exclusive with -t. -E Disable entropy estimation from the collected timing information for the given device name or device type. If collection is still enabled, timing information is still collected and mixed into the internal entropy pool, but no entropy is assumed to be present. -e Enable entropy estimation using the collected timing information for the given device name or device type. -i With the -L option to load a seed from a file, ignore any esti- mate in the file of the entropy of the seed. This still loads the data into the kernel, but won't unblock /dev/random even if the file claims to have adequate entropy. This is useful if the file is on a medium, such as an NFS share, that the operator does not know to be secret. -L Load saved entropy from file save-file and overwrite it with a seed derived by hashing it together with output from /dev/urandom so that the new seed has at least as much entropy as either the old seed had or the system already has. If interrupted, either the old seed or the new seed will be in place. -l List all sources, or, if the -t or -d flags are specified, only those specified by the devtype or devname specified. -S Save entropy pool to file save-file. The file format is specific to rndctl and includes an estimate of the amount of saved entropy and a checksum. -s Display statistics on the current state of the entropy pool. -t All devices of type devtype are altered or displayed. This is mutually exclusive with -d. The available types are: disk Physical hard drives. net Network interfaces. tape Tape devices. tty Terminal, mouse, or other user input devices. rng Hardware random number generators. -v Verbose output.
The rndctl program was first made available in NetBSD 1.3.
The rndctl program was written by Michael Graff <email@example.com>. NetBSD 9.0 August 10, 2014 NetBSD 9.0
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