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63 lines
1.1 KiB
C
63 lines
1.1 KiB
C
/*
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* Copyright (C) 2017 Freie Universität Berlin
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys_luid
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* @{
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*
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* @file
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* @brief LUID module implementation
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*
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* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
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*
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* @}
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*/
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#include <stdint.h>
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#include <string.h>
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#include "assert.h"
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#include "periph/cpuid.h"
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#include "luid.h"
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static uint8_t lastused = 1;
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void luid_get(void *buf, size_t len)
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{
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luid_base(buf, len);
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((uint8_t *)buf)[0] ^= lastused++;
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}
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void luid_custom(void *buf, size_t len, int gen)
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{
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luid_base(buf, len);
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for (size_t i = 0; i < sizeof(gen); i++) {
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((uint8_t *)buf)[i % len] ^= ((gen >> (i * 8)) & 0xff);
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}
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}
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void luid_base(void *buf, size_t len)
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{
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assert(buf && (len > 0));
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memset(buf, LUID_BACKUP_SEED, len);
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#if CPUID_LEN
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uint8_t *out = (uint8_t *)buf;
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uint8_t cid[CPUID_LEN];
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cpuid_get(cid);
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for (size_t i = 0; i < CPUID_LEN; i++) {
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out[i % len] ^= cid[i];
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}
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#endif
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}
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