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drivers: entropy: Add the PSA Crypto Random entropy driver

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This adds an entropy driver calling the PSA Crypto psa_generate_random()
API to get random bytes.

Currently this only uses the TFM provided psa_generate_random().

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Valerio Setti <vsetti@baylibre.com>
This commit is contained in:
Neil Armstrong 2022-07-01 16:09:44 +02:00 • committed by Carles Cufí
commit 3b407a1987
4 changed files with 70 additions and 0 deletions
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7
drivers/entropy/CMakeLists.txt
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@ -20,3 +20,10 @@ zephyr_library_sources_ifdef(CONFIG_ENTROPY_GECKO_TRNG entropy_gecko_trn
zephyr_library_sources_ifdef(CONFIG_ENTROPY_NEORV32_TRNG entropy_neorv32_trng.c) zephyr_library_sources_ifdef(CONFIG_ENTROPY_NEORV32_TRNG entropy_neorv32_trng.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_BT_HCI entropy_bt_hci.c) zephyr_library_sources_ifdef(CONFIG_ENTROPY_BT_HCI entropy_bt_hci.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_GECKO_SE entropy_gecko_se.c) zephyr_library_sources_ifdef(CONFIG_ENTROPY_GECKO_SE entropy_gecko_se.c)
zephyr_library_sources_ifdef(CONFIG_ENTROPY_PSA_CRYPTO_RNG entropy_psa_crypto.c)
if (CONFIG_BUILD_WITH_TFM)
target_include_directories(${ZEPHYR_CURRENT_LIBRARY} PRIVATE
$<TARGET_PROPERTY:tfm,TFM_BINARY_DIR>/install/interface/include
)
endif()

1
drivers/entropy/Kconfig
View file

@ -33,6 +33,7 @@ source "drivers/entropy/Kconfig.litex"
source "drivers/entropy/Kconfig.gecko" source "drivers/entropy/Kconfig.gecko"
source "drivers/entropy/Kconfig.neorv32" source "drivers/entropy/Kconfig.neorv32"
source "drivers/entropy/Kconfig.bt_hci" source "drivers/entropy/Kconfig.bt_hci"
source "drivers/entropy/Kconfig.psa_crypto"
config ENTROPY_HAS_DRIVER config ENTROPY_HAS_DRIVER
bool bool

11
drivers/entropy/Kconfig.psa_crypto Normal file
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@ -0,0 +1,11 @@
# Copyright (c) 2022 Nordic Semiconductor ASA
# SPDX-License-Identifier: Apache-2.0
# PSA Crypto Random source configuration options
config ENTROPY_PSA_CRYPTO_RNG
bool "PSA Crypto Random source Entropy driver"
depends on BUILD_WITH_TFM
select ENTROPY_HAS_DRIVER
help
Enable the PSA Crypto source Entropy driver.

51
drivers/entropy/entropy_psa_crypto.c Normal file
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@ -0,0 +1,51 @@
/*
* Copyright (c) 2022 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT zephyr_psa_crypto_rng
#include <zephyr/drivers/entropy.h>
#include <psa/crypto.h>
/* API implementation: PSA Crypto initialization */
static int entropy_psa_crypto_rng_init(const struct device *dev)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
ARG_UNUSED(dev);
status = psa_crypto_init();
if (status != PSA_SUCCESS) {
return -EIO;
}
return 0;
}
/* API implementation: get_entropy */
static int entropy_psa_crypto_rng_get_entropy(const struct device *dev,
uint8_t *buffer, uint16_t length)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
ARG_UNUSED(dev);
status = psa_generate_random(buffer, length);
if (status != PSA_SUCCESS) {
return -EIO;
}
return 0;
}
/* Entropy driver APIs structure */
static const struct entropy_driver_api entropy_psa_crypto_rng_api = {
.get_entropy = entropy_psa_crypto_rng_get_entropy,
};
/* Entropy driver registration */
DEVICE_DT_INST_DEFINE(0, entropy_psa_crypto_rng_init, NULL, NULL, NULL,
PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
&entropy_psa_crypto_rng_api);