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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/sio.h>
#include <sys/device.h>
#include <sys/driver.h>
#include <dev/random/chacha20.h>
#include <dev/random/siphash.h>
#include <dev/random/entropy.h>
#include <fs/devfs.h>
#include <string.h>
static struct cdevsw random_cdevsw;
static struct entropy_pool entropy;
uint8_t key[32] = {0};
uint8_t nonce[12] = {0};
uint32_t state[16];
uint32_t tsc;
static inline uint64_t
read_tsc(void)
{
uint32_t lo, hi;
__asm__ volatile ("rdtsc" : "=a"(lo), "=d"(hi));
return ((uint64_t)hi << 32) | lo;
}
static int
random_read(dev_t dev, struct sio_txn *sio, int flags)
{
tsc = read_tsc();
mix_entropy(&entropy, (uint8_t *)&tsc, sizeof(tsc), 1);
chacha20_init(state, entropy.pool, nonce, 0);
chacha20_encrypt(state, NULL, sio->buf, sio->len);
return sio->len;
}
static int
random_init(void)
{
char devname[] = "random";
devmajor_t major;
dev_t dev;
/* Register the device here */
major = dev_alloc_major();
dev = dev_alloc(major);
dev_register(major, dev, &random_cdevsw);
devfs_create_entry(devname, major, dev, 0444);
return 0;
}
static struct cdevsw random_cdevsw = {
.read = random_read,
.write = nowrite
};
DRIVER_EXPORT(random_init, "random");
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