puf_sram.h
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1 /*
2  * SPDX-FileCopyrightText: 2018 HAW Hamburg
3  * SPDX-License-Identifier: LGPL-2.1-only
4  */
5 
6 #pragma once
7 
54 #ifdef __cplusplus
55 extern "C" {
56 #endif
57 
58 #include <stdbool.h>
59 #include <stddef.h>
60 #include <stdint.h>
61 
65 #ifndef SEED_RAM_LEN
66 #define SEED_RAM_LEN (2048 / sizeof(uint32_t))
67 #endif
68 
74 #define PUF_SRAM_MARKER (0xad3021ff)
75 
79 extern uint32_t puf_sram_seed;
80 
88 extern uint32_t puf_sram_state;
89 
95 extern uint32_t puf_sram_softreset_cnt;
96 
105 void puf_sram_init(const uint8_t *ram, size_t len);
106 
114 void puf_sram_generate(const uint8_t *ram, size_t len);
115 
123 bool puf_sram_softreset(void);
124 
125 #ifdef __cplusplus
126 }
127 #endif
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.