1 /*
2 * Copyright (c) 2022 Nordic Semiconductor ASA
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #define DT_DRV_COMPAT zephyr_psa_crypto_rng
8
9 #include <zephyr/drivers/entropy.h>
10 #include <psa/crypto.h>
11
12 /* API implementation: PSA Crypto initialization */
entropy_psa_crypto_rng_init(const struct device * dev)13 static int entropy_psa_crypto_rng_init(const struct device *dev)
14 {
15 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
16
17 ARG_UNUSED(dev);
18
19 status = psa_crypto_init();
20 if (status != PSA_SUCCESS) {
21 return -EIO;
22 }
23
24 return 0;
25 }
26
27 /* API implementation: get_entropy */
entropy_psa_crypto_rng_get_entropy(const struct device * dev,uint8_t * buffer,uint16_t length)28 static int entropy_psa_crypto_rng_get_entropy(const struct device *dev,
29 uint8_t *buffer, uint16_t length)
30 {
31 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
32
33 ARG_UNUSED(dev);
34
35 status = psa_generate_random(buffer, length);
36 if (status != PSA_SUCCESS) {
37 return -EIO;
38 }
39
40 return 0;
41 }
42
43 /* Entropy driver APIs structure */
44 static DEVICE_API(entropy, entropy_psa_crypto_rng_api) = {
45 .get_entropy = entropy_psa_crypto_rng_get_entropy,
46 };
47
48 /* Entropy driver registration */
49 DEVICE_DT_INST_DEFINE(0, entropy_psa_crypto_rng_init, NULL, NULL, NULL,
50 PRE_KERNEL_1, CONFIG_ENTROPY_INIT_PRIORITY,
51 &entropy_psa_crypto_rng_api);
52
