core: pta: Use common crypto_rng_read() over hw_get_random_byte()

This PTA is one of the only direct users of hw_get_random_byte(),
the common path is through crypto_rng_read().

This does mean in s

core: pta: Use common crypto_rng_read() over hw_get_random_byte()

This PTA is one of the only direct users of hw_get_random_byte(),
the common path is through crypto_rng_read().

This does mean in systems without a HW RNG this may go through
the software PRNG, but this path is locked out by build-time
checks on platforms that enable this PTA already.

Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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pta: rng: rename rng_pta_client.h to pta_rng.h

Renames RNG PTA exported header file from rng_pta_client.h to pta_rng.h
as the later follows PTAs header file name convention in optee_os
that is pta_x

pta: rng: rename rng_pta_client.h to pta_rng.h

Renames RNG PTA exported header file from rng_pta_client.h to pta_rng.h
as the later follows PTAs header file name convention in optee_os
that is pta_xxx.h.

Preserve rng_pta_client.h for backward compatibility. That header file
only includes pta_rng.h.

Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: pta: add generic RNG pseudo TA

Platforms that include hardware-based RNGs and implement
hw_get_random_byte() may benefit from already implemented bus framework
and rng driver [1].
For this rea

core: pta: add generic RNG pseudo TA

Platforms that include hardware-based RNGs and implement
hw_get_random_byte() may benefit from already implemented bus framework
and rng driver [1].
For this reason the interface of rng.pta implemented for Developerbox
platform is re-used. Interface is generic and corresponds to in-kernel
optee-rng driver.

Pseudo TA interface is specifically used so that credible entropy is
available to REE early at boot, even before user-space is fully up.

[1] https://lwn.net/Articles/777260/

Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@epam.com>
Reviewed-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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