From c52fde668bda08c4d86bc398db84bb89fe35b44c Mon Sep 17 00:00:00 2001
From: Martine Lenders <m.lenders@fu-berlin.de>
Date: Thu, 26 Oct 2017 15:56:16 +0200
Subject: [PATCH] sys: random: make fallback seed configurable at compile time

---
 sys/include/random.h | 8 ++++++++
 sys/random/seed.c    | 2 +-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/sys/include/random.h b/sys/include/random.h
index 85eb4bb13c..7a04081dc2 100644
--- a/sys/include/random.h
+++ b/sys/include/random.h
@@ -32,6 +32,14 @@
 extern "C" {
 #endif
 
+#ifndef RANDOM_DEFAULT_SEED
+/**
+ * @brief   Seed selected when all tries to collect seeds from a random source
+ *          failed
+ */
+#define RANDOM_DEFAULT_SEED (1)
+#endif
+
 /**
  * @brief Enables support for floating point random number generation
  */
diff --git a/sys/random/seed.c b/sys/random/seed.c
index b60f1285c7..b53d4ff814 100644
--- a/sys/random/seed.c
+++ b/sys/random/seed.c
@@ -34,7 +34,7 @@ void auto_init_random(void)
     luid_get(&seed, 4);
 #else
     LOG_WARNING("random: NO SEED AVAILABLE!\n");
-    seed = 1;
+    seed = RANDOM_SEED_DEFAULT;
 #endif
     DEBUG("random: using seed value %u\n", (unsigned)seed);
     random_init(seed);