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Bluetooth: Controller: Rework FAKE_ENTROPY_NATIVE_POSIX text

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Rework comment text for FAKE_ENTROPY_NATIVE_POSIX used as
entropy driver for the Controller on BOARD_NRF54L15BSIM.

Relates to commit 34b6b3d9eb ("Bluetooth: Controller:
Support FAKE_ENTROPY_NATIVE_POSIX").

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
This commit is contained in:
Vinayak Kariappa Chettimada 2024-09-10 08:08:10 +02:00 committed by Carles Cufí
parent 7fadfeec7c
commit 9eb35c4e24
2 changed files with 13 additions and 10 deletions
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20
subsys/bluetooth/controller/Kconfig
View file

@ -157,18 +157,18 @@ config BT_CTLR_ENTROPY
select ENTROPY_GENERATOR select ENTROPY_GENERATOR
default y default y
help help
Use random number generation provided by the Controller. Use random number generation selected by the Controller.
Bluetooth Core Specification mandates a use of random number generator Bluetooth Core Specification mandates a use of random number generator
compliant with FIPS PUB 140-2. compliant with FIPS PUB 140-2.
This option allows for Controller implementation that do not use true Deselecting this option allows for Controllers to use other entropy
random number generation and hence making the implementation as generators which may not be true random number generators, and hence
experimental. would make the implementation experimental.
Controller implementations can provide custom bare-metal random number A Controller implementation could also provide custom bare-metal
implementation without any support in Zephyr driver, i.e. there is no random number generator implementation without any support in Zephyr
ENTROPY_HAS_DRIVER enabled. driver, i.e. there is no ENTROPY_HAS_DRIVER enabled.
config BT_CTLR_CRYPTO config BT_CTLR_CRYPTO
bool "Crypto functions in Controller" bool "Crypto functions in Controller"
@ -178,11 +178,11 @@ config BT_CTLR_CRYPTO
Use random number generation and AES encryption support functions Use random number generation and AES encryption support functions
provided by the controller. provided by the controller.
Support for HCI LE Rand and HCI LE Encrypt commands are mandatory Support for HCI LE Rand and HCI LE Encrypt commands is mandatory by
by Bluetooth Core Specification. Bluetooth Core Specification.
In an Application/Host and Controller split (using a HCI transport) or In an Application/Host and Controller split (using a HCI transport) or
combined builds for single CPU SoCs, applications can use its own combined builds for single CPU SoCs, applications can use their own
FIPS-197 compliant cryptographic implementations. In this case the FIPS-197 compliant cryptographic implementations. In this case the
Controller cryptographic implementations can be disabled to save flash Controller cryptographic implementations can be disabled to save flash
and RAM usage. and RAM usage.

3
subsys/bluetooth/controller/ll_sw/nordic/lll/lll.c
View file

@ -59,6 +59,9 @@ static struct {
/* Entropy device */ /* Entropy device */
#if defined(CONFIG_ENTROPY_HAS_DRIVER) #if defined(CONFIG_ENTROPY_HAS_DRIVER)
/* FIXME: This could probably use a chosen entropy device instead on relying on
* the nodelabel being the same as for the old nrf rng.
*/
static const struct device *const dev_entropy = DEVICE_DT_GET(DT_NODELABEL(rng)); static const struct device *const dev_entropy = DEVICE_DT_GET(DT_NODELABEL(rng));
#endif /* CONFIG_ENTROPY_HAS_DRIVER */ #endif /* CONFIG_ENTROPY_HAS_DRIVER */