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soc: arm: nxp_imx: rt: Configure settings for TRNG IP

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RT platforms that support TRNG IP (rt10xx and rt6xx) need to set
RNG and CSRNG to Xoroshiro and CTR_DRBG respectively instead of
using TRNG as random source.

Fixes: #37307

Signed-off-by: David Leach <david.leach@nxp.com>
This commit is contained in:
David Leach 2021-08-02 17:21:16 -05:00 • committed by Christopher Friedt
commit 569a1a0a5d
3 changed files with 52 additions and 0 deletions
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16
drivers/entropy/Kconfig.mcux
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@ -26,3 +26,19 @@ config ENTROPY_MCUX_RNG
help
This option enables the true random number generator (TRNG)
driver based on the MCUX RNG driver on LPC Family.
#
# Don't use use the MCUX TRNG as a random source as it is not designed
# to supply a continuous random stream. Instead, it is used to provide
# a seed to RNG generator.
#
# Use the software implemented xoroshiro RNG.
# Use CSPRNG for cryptographically secure RNG source.
#
choice RNG_GENERATOR_CHOICE
default XOSHIRO_RANDOM_GENERATOR if ENTROPY_MCUX_TRNG
endchoice
choice CSPRNG_GENERATOR_CHOICE
default CTR_DRBG_CSPRNG_GENERATOR if ENTROPY_MCUX_TRNG
endchoice