Re: [RFC] crypto: exynos - Icrease the priority of the driver

[Stephan Mueller]

Am Dienstag, 5. Dezember 2017, 13:42:14 CET schrieb Åukasz Stelmach:

Hi Åukasz,

> exynos-rng is one of many implementations of stdrng. With priority as
> low as 100 it isn't selected, if software implementations (DRBG) are
> available.

What about using 300? The reason is the following: in the normal case, the 
software PRNGs have 100 (X9.31) and 200 (SP800-90A DRBG). Thus, in normal 
case, the hardware takes precedence.

In FIPS mode, the DRBG prio is increased by 200. As in FIPS mode you must have 
a DRBG and assuming that the hardware does not implement a DRBG, the software 
DRBG should be used as otherwise you have a FIPS-problem.

Ciao
Stephan