Am Mittwoch, 20. Mai 2020, 14:00:01 CEST schrieb Krzysztof Kozlowski: Hi Krzysztof, > On Wed, 20 May 2020 at 13:53, Stephan Mueller <smueller@xxxxxxxxxx> wrote: > > > > That said, the illustrated example is typical for hardware RNGs. Yet > > > > it is never guaranteed to work that way. Thus, if you can point to > > > > architecture documentation of your specific hardware RNGs showing that > > > > the data read from the hardware is pure unconditioned noise data, then > > > > I have no objections to the patch. > > > > > > I can tell for sure that this is the case for exynos-trng[1]. > > > > So you are saying that the output for the exynos-trng is straight from a > > ring oscillator without any post-processing of any kind? > > Hi, > > I think we will never be able to state this because the manual is > quite limited in sharing internals. What the driver does and probably > Lukasz wanted to say is that there is "post processing" block and > feature which can be disabled. The manual is saying the TRNG block > generates random data from thermal noise but not how much in a direct > way. There could be some simple post-processing or not (except the one > able to on/off). Also manual says this post processing block is there > to remove statistical weakness from the TRNG block. To me it does not > prove enough that raw data is really raw... Unterstood, but can't that statement be added to the commit message? > > Best regards, > Krzysztof Ciao Stephan
