76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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/*
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* Copyright (c) 2024 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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#include <zephyr/random/random.h>
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#include <mbedtls/entropy.h>
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#include <psa/crypto.h>
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#if defined(CONFIG_MBEDTLS_ENTROPY_POLL_ZEPHYR) || defined(CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
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static int get_random_data(uint8_t *output, size_t output_size, bool allow_non_cs)
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{
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int ret = MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED;
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#if defined(CONFIG_CSPRNG_ENABLED)
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ret = sys_csrand_get(output, output_size);
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if (ret == 0) {
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return 0;
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}
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#endif /* CONFIG_CSPRNG_ENABLED */
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if (allow_non_cs) {
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sys_rand_get(output, output_size);
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ret = 0;
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}
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return ret;
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}
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#endif /* CONFIG_MBEDTLS_ENTROPY_POLL_ZEPHYR || CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
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#if defined(CONFIG_MBEDTLS_ENTROPY_POLL_ZEPHYR)
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int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len,
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size_t *olen)
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{
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int ret;
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uint16_t request_len = len > UINT16_MAX ? UINT16_MAX : len;
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ARG_UNUSED(data);
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if (output == NULL || olen == NULL || len == 0) {
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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ret = get_random_data(output, len, true);
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if (ret < 0) {
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return MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
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}
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*olen = request_len;
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return 0;
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}
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#endif /* CONFIG_MBEDTLS_ENTROPY_POLL_ZEPHYR */
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#if defined(CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
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psa_status_t mbedtls_psa_external_get_random(
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mbedtls_psa_external_random_context_t *context,
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uint8_t *output, size_t output_size, size_t *output_length)
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{
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(void) context;
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int ret;
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ret = get_random_data(output, output_size,
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IS_ENABLED(CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG_ALLOW_NON_CSPRNG));
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if (ret != 0) {
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return PSA_ERROR_GENERIC_ERROR;
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}
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*output_length = output_size;
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return PSA_SUCCESS;
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}
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#endif /* CONFIG_MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
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