3b407a1987
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>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
/*
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* Copyright (c) 2022 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT zephyr_psa_crypto_rng
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#include <zephyr/drivers/entropy.h>
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#include <psa/crypto.h>
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/* API implementation: PSA Crypto initialization */
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static int entropy_psa_crypto_rng_init(const struct device *dev)
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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ARG_UNUSED(dev);
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status = psa_crypto_init();
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if (status != PSA_SUCCESS) {
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return -EIO;
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}
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return 0;
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}
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/* API implementation: get_entropy */
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static int entropy_psa_crypto_rng_get_entropy(const struct device *dev,
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uint8_t *buffer, uint16_t length)
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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ARG_UNUSED(dev);
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status = psa_generate_random(buffer, length);
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if (status != PSA_SUCCESS) {
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return -EIO;
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}
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return 0;
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}
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/* Entropy driver APIs structure */
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static const struct entropy_driver_api entropy_psa_crypto_rng_api = {
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.get_entropy = entropy_psa_crypto_rng_get_entropy,
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};
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/* Entropy driver registration */
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DEVICE_DT_INST_DEFINE(0, entropy_psa_crypto_rng_init, NULL, NULL, NULL,
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PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
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&entropy_psa_crypto_rng_api);
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