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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-04-23 GuEe-GUI first version
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "optee.examples"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
/*
* Build the OP-TEE for your platform with the hwrng TA:
* https://optee.readthedocs.io/en/latest/building/devices/qemu.html#qemu-v8
*/
static void optee_uuid_copy(rt_uint8_t *d, struct rt_tee_uuid *s)
{
d[0] = s->time_low >> 24;
d[1] = s->time_low >> 16;
d[2] = s->time_low >> 8;
d[3] = s->time_low;
d[4] = s->time_mid >> 8;
d[5] = s->time_mid;
d[6] = s->time_hi_and_version >> 8;
d[7] = s->time_hi_and_version;
rt_memcpy(d + 8, s->clock_seq_and_node, sizeof(s->clock_seq_and_node));
}
static struct rt_tee_open_session_arg *open_session_arg_alloc(rt_uint32_t params_nr)
{
return rt_calloc(1, sizeof(struct rt_tee_open_session_arg) +
sizeof(struct rt_tee_param) * params_nr);
}
static void open_session_arg_free(struct rt_tee_open_session_arg *arg)
{
rt_free(arg);
}
static struct rt_tee_invoke_arg *invoke_arg_alloc(rt_uint32_t params_nr)
{
return rt_calloc(1, sizeof(struct rt_tee_invoke_arg) +
sizeof(struct rt_tee_param) * params_nr);
}
static void invoke_arg_free(struct rt_tee_invoke_arg *arg)
{
rt_free(arg);
}
static struct rt_tee_device *open_tee_device(char *name)
{
struct rt_device *dev = rt_device_find(name ? : "tee0");
if (dev && !rt_device_open(dev, 0))
{
return rt_container_of(dev, struct rt_tee_device, parent);
}
return RT_NULL;
}
static void close_tee_device(struct rt_tee_device *tdev)
{
rt_device_close(&tdev->parent);
}
/*
* This UUID is generated with uuidgen
* the ITU-T UUID generator at http://www.itu.int/ITU-T/asn1/uuid.html
*/
static int optee_example_rng(int argc, char**argv)
{
rt_err_t err;
struct rt_tee_shm shm;
struct rt_tee_device *tdev;
struct rt_tee_invoke_arg *invoke;
struct rt_tee_open_session_arg *open;
struct rt_tee_uuid uuid =
{
0xab7a617c, 0xb8e7, 0x4d8f,
{ 0x83, 0x01, 0xd0, 0x9b, 0x61, 0x03, 0x6b, 0x64 }
};
if (!(tdev = open_tee_device(RT_NULL)))
{
return -RT_EIO;
}
if (!(open = open_session_arg_alloc(0)))
{
err = -RT_ENOMEM;
goto _close_tee;
}
optee_uuid_copy(open->uuid, &uuid);
if ((err = rt_tee_open_session(tdev, open)) ||
open->ret != RT_TEE_SUCCESS)
{
if (!err)
{
err = -RT_ERROR;
}
goto _free_args;
}
shm.size = 32;
shm.align = RT_MM_PAGE_SIZE;
shm.flags = TEE_SHM_SYS;
if ((err = rt_tee_shm_register(tdev, &shm)))
{
goto _close_session;
}
rt_memset(shm.vaddr, 0, shm.size);
if (!(invoke = invoke_arg_alloc(1)))
{
err = -RT_ENOMEM;
goto _free_shm;
}
/* TA_CMD_GET_ENTROPY */
invoke->func = 0x0;
invoke->session = open->session;
invoke->cancel_id = 0;
invoke->params_nr = 1;
invoke->params[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_OUT;
invoke->params[0].memref.size = shm.size;
invoke->params[0].memref.shm = &shm;
invoke->params[0].memref.shm_offs = 0;
err = rt_tee_invoke(tdev, invoke);
if (!err && invoke->ret == RT_TEE_SUCCESS)
{
rt_uint8_t *rng = shm.vaddr;
for (int i = 0; i < shm.size; ++i)
{
rt_kprintf("RNG[%02d]: %02x\n", i, rng[i]);
}
}
else
{
rt_kprintf("Failed to read RNG: err=%x origin=%x\n", invoke->ret, invoke->ret_origin);
}
invoke_arg_free(invoke);
_free_shm:
rt_tee_shm_unregister(tdev, &shm);
rt_tee_shm_free_helper(&shm);
_close_session:
rt_tee_close_session(tdev, open->session);
_free_args:
open_session_arg_free(open);
_close_tee:
close_tee_device(tdev);
return (int)err;
}
MSH_CMD_EXPORT(optee_example_rng, optee example rng);
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