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puf_sram.h
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1/*
2 * Copyright (C) 2018 HAW Hamburg
3 *
4 * This file is subject to the terms and conditions of the GNU Lesser
5 * General Public License v2.1. See the file LICENSE in the top level
6 * directory for more details.
7 */
8
54#ifndef PUF_SRAM_H
55#define PUF_SRAM_H
56
57#ifdef __cplusplus
58extern "C" {
59#endif
60
61#include <stdbool.h>
62#include <stddef.h>
63#include <stdint.h>
64
68#ifndef SEED_RAM_LEN
69#define SEED_RAM_LEN (2048 / sizeof(uint32_t))
70#endif
71
77#define PUF_SRAM_MARKER (0xad3021ff)
78
82extern uint32_t puf_sram_seed;
83
91extern uint32_t puf_sram_state;
92
98extern uint32_t puf_sram_softreset_cnt;
99
108void puf_sram_init(const uint8_t *ram, size_t len);
109
117void puf_sram_generate(const uint8_t *ram, size_t len);
118
126bool puf_sram_softreset(void);
127
128#ifdef __cplusplus
129}
130#endif
132#endif /* PUF_SRAM_H */
puf_sram_state
uint32_t puf_sram_state
Global seed state, allocated in puf_sram.c 0 means seed was generated from SRAM pattern,...
puf_sram_init
void puf_sram_init(const uint8_t *ram, size_t len)
checks source of reboot by puf_sram_softreset and conditionally calls puf_sram_generate
puf_sram_generate
void puf_sram_generate(const uint8_t *ram, size_t len)
builds hash from SEED_RAM_LEN bytes uninitialized SRAM, writes it to the global variable puf_sram_see...
puf_sram_softreset
bool puf_sram_softreset(void)
checks for a memory marker to determine whether memory contains old data.
puf_sram_softreset_cnt
uint32_t puf_sram_softreset_cnt
Counter variable allocated in puf_sram.c.
puf_sram_seed
uint32_t puf_sram_seed
Global seed variable, allocated in puf_sram.c.