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# NPCX DRBG driver configuration options
# Copyright (c) 2024 Nuvoton Technology Corporation.
# SPDX-License-Identifier: Apache-2.0
menuconfig ENTROPY_NPCX_DRBG
bool "NPCX DRBG driver"
default y
depends on DT_HAS_NUVOTON_NPCX_DRBG_ENABLED && SOC_NPCX9MFP
select ENTROPY_HAS_DRIVER
help
This option enables the deterministic random bit generator (DRBG)
driver for NPCX family of processors.
if ENTROPY_NPCX_DRBG
choice
prompt "DRBG Security Strength Selection"
default ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_128B
help
The chosen security strength defines the amount of entropy bits
generated internally and passed to the conditioning component.
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_112B
bool "DRBG security strength 112 bits"
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_128B
bool "DRBG security strength 128 bits"
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_192B
bool "DRBG security strength 192 bits"
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_256B
bool "DRBG security strength 256 bits"
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_128B_TEST
bool "DRBG security strength 12b bits test"
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_256B_TEST
bool "DRBG security strength 256 bits test"
endchoice
config ENTROPY_NPCX_DRBG_SECURITY_STRENGTH
int
default 0 if ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_112B
default 1 if ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_128B
default 2 if ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_192B
default 3 if ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_256B
default 4 if ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_128B_TEST
default 5 if ENTROPY_NPCX_DRBG_SECURITY_STRENGTH_256B_TEST
config ENTROPY_NPCX_DRBG_RESEED_INTERVAL
int "DRBG Reseed Interval"
default 100
help
Number of gererations allowed until next reseeding.
endif