On Di, 2019-10-29 at 09:29 -0700, Andrey Smirnov wrote: > Everyone: > > This series is a continuation of original [discussion]. I don't know > if what's in the series is enough to use CAAMs HWRNG system wide, but > I am hoping that with enough iterations and feedback it will be. > > Feedback is welcome! I'm not sure if we can ever use the job based RNG interface to hook it up to the Linux HWRNG interface. After all the job based RNG interface is always a DRNG, which only gets seeded by the TRNG. The reseed interval is given in number of clock cycles, so there is no clear correlation between really true random input bits and the number of DRNG output bits. I've hacked up some proof of concept code which uses the TRNG access in the control interface to get the raw TRNG random bits. This seems to yield about 6400 bit/s of true entropy. It may be better to use this interface to hook up to the Linux HWRNG framework. Regards, Lucas
