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Man Pages
RNDTEST(4) FreeBSD Kernel Interfaces Manual RNDTEST(4)

rndtest
FIPS 140-2 random number generator test monitor

device rndtest

The rndtest driver “hooks up” to hardware crypto devices to monitor the entropy data passed to the random(4) subsystem. This data is periodically tested for FIPS 140-2 compliance and statistics are collected. If the harvested entropy fails any of the FIPS test suite, then it is discarded and testing is continuously applied until “good data” is received from the device. Failures are optionally reported on the console.

crypto(4), hifn(4), random(4), safe(4), crypto(9)

The idea for this and the original code came from Jason L. Wright. The rndtest device driver first appeared in FreeBSD 5.0.

Crypto device drivers must be compiled specially to make use of this driver; this should not be necessary. This feature might better be integrated into the random(4) subsystem where it can be applied to devices that claim to supply “pure entropy”.
May 11, 2020 FreeBSD 13.1-RELEASE

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