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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 <service/crypto/provider/mbedcrypto/entropy_adapter/entropy_adapter.h>
#include <errno.h>
#include <sys/syscall.h>
#include <unistd.h>
/*
* An mbed tls compatibile hardware entropy source that adapts the mbed tls hardware poll
* function to the Linux getrandom system call.
*/
int entropy_adapter_init(void *config)
{
(void)config;
return 0;
}
void entropy_adapter_deinit(void)
{
}
int mbedtls_hardware_poll(void *data, unsigned char *output, size_t len, size_t *olen)
{
int status = MBEDTLS_ERR_ENTROPY_SOURCE_FAILED;
*olen = 0;
int num_output = syscall(SYS_getrandom, output, len, 0);
if (num_output >= 0) {
*olen = num_output;
status = 0;
}
return status;
}
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