From 64489e8b444efde859e9f048b17707e5da88a983 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Fri, 8 Feb 2019 14:41:57 +0100
Subject: [PATCH] sys/random: add hwrng as seed source (if available)
---
Makefile.dep | 4 ++++
sys/random/random.c | 7 +++++++
2 files changed, 11 insertions(+)
diff --git a/Makefile.dep b/Makefile.dep
index fac5838696..f89090bbb5 100644
--- a/Makefile.dep
+++ b/Makefile.dep
@@ -661,6 +661,10 @@ ifneq (,$(filter random,$(USEMODULE)))
USEMODULE += hashes
endif
+ ifeq (,$(filter puf_sram,$(USEMODULE)))
+ FEATURES_OPTIONAL += periph_hwrng
+ endif
+
USEMODULE += luid
endif
diff --git a/sys/random/random.c b/sys/random/random.c
index 3d356c8dca..ffd23fcfff 100644
--- a/sys/random/random.c
+++ b/sys/random/random.c
@@ -1,5 +1,6 @@
/**
* Copyright (C) 2017 Kaspar Schleiser <kaspar@schleiser.de>
+ * 2019 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
@@ -14,6 +15,7 @@
* @brief PRNG seeding
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
+ * @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @}
*/
@@ -25,6 +27,9 @@
#ifdef MODULE_PUF_SRAM
#include "puf_sram.h"
#endif
+#ifdef MODULE_PERIPH_HWRNG
+#include "periph/hwrng.h"
+#endif
#ifdef MODULE_PERIPH_CPUID
#include "periph/cpuid.h"
#endif
@@ -41,6 +46,8 @@ void auto_init_random(void)
LOG_WARNING("random: PUF SEED not fresh\n");
}
seed = puf_sram_seed;
+#elif defined (MODULE_PERIPH_HWRNG)
+ hwrng_read(&seed, 4);
#elif defined (MODULE_PERIPH_CPUID)
luid_get(&seed, 4);
#else
--
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