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/*
* Copyright (c) 2021, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <mbedtls/entropy.h>
#include <platform/interface/trng.h>
#include <service/crypto/provider/mbedcrypto/trng_adapter/trng_adapter.h>
#include <config/interface/platform_config.h>
#include <stddef.h>
/*
* An mbed tls compatibile hardware entropy source that adapts the mbed tls hardware poll
* function to a platform trng driver. The actual realization of the driver
* will depend on the platform selected at build-time.
*/
static struct platform_trng_driver driver = {0};
int trng_adapter_init(int instance)
{
int status;
struct device_region *device_region;
device_region = platform_config_device_query("trng", instance);
status = platform_trng_create(&driver, device_region);
platform_config_device_query_free(device_region);
return status;
}
void trng_adapter_deinit()
{
platform_trng_destroy(&driver);
driver.iface = NULL;
driver.context = NULL;
}
int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen)
{
int status = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
*olen = 0;
if (driver.iface) {
status = driver.iface->poll(driver.context, output, len, olen);
}
return status;
}
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