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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2019 Pengutronix, Bastian Krause <kernel@pengutronix.de>
*/
#include <common.h>
#include <init.h>
#include <digest.h>
#include <globalvar.h>
#include <magicvar.h>
#include <crypto/sha.h>
#include <machine_id.h>
#define MACHINE_ID_LENGTH 32
static void *__machine_id_hashable;
static size_t __machine_id_hashable_length;
void machine_id_set_hashable(const void *hashable, size_t len)
{
__machine_id_hashable = xmemdup(hashable, len);
__machine_id_hashable_length = len;
}
static int machine_id_set_bootarg(void)
{
struct digest *digest = NULL;
unsigned char machine_id[SHA1_DIGEST_SIZE];
char hex_machine_id[MACHINE_ID_LENGTH];
char *env_machine_id;
int ret = 0;
/* nothing to do if no hashable information provided */
if (!__machine_id_hashable)
goto out;
digest = digest_alloc_by_algo(HASH_ALGO_SHA1);
ret = digest_init(digest);
if (ret)
goto out;
ret = digest_update(digest, __machine_id_hashable,
__machine_id_hashable_length);
if (ret)
goto out;
ret = digest_final(digest, machine_id);
if (ret)
goto out;
/* use the first 16 bytes of the sha1 hash as the machine id */
bin2hex(hex_machine_id, machine_id, MACHINE_ID_LENGTH/2);
env_machine_id = basprintf("%.*s", MACHINE_ID_LENGTH, hex_machine_id);
globalvar_add_simple("machine_id", env_machine_id);
free(env_machine_id);
out:
globalvar_add_simple("machine_id", NULL);
digest_free(digest);
return ret;
}
late_initcall(machine_id_set_bootarg);
BAREBOX_MAGICVAR_NAMED(global_machine_id, global.machine_id, "Persistent device-specific, hexadecimal, 32-character id");
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