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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 <mbedtls/entropy_poll.h>
#include <platform/interface/entropy.h>
#include <service/crypto/provider/mbedcrypto/entropy_adapter/entropy_adapter.h>
#include <stddef.h>
/*
* An mbed tls compatibile hardware entropy source that adapts the mbed tls hardware poll
* function to a platform entropy driver. The actual realization of the driver
* will depend on the platform selected at build-time.
*/
static struct ts_plat_entropy_driver driver = {0};
int entropy_adapter_init(void *config)
{
return ts_plat_entropy_create(&driver, config);
}
void entropy_adapter_deinit(void)
{
ts_plat_entropy_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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