From e7ea31b16f0a751329ecfa92d2a29f959f083cb7 Mon Sep 17 00:00:00 2001
From: Kamil Sroka <kamil.sroka@nordicsemi.no>
Date: Wed, 4 Sep 2019 21:06:27 +0200
Subject: [PATCH] [crypto] seed PRNG from DRBG when possible (#4141)

---
 src/core/common/random_manager.cpp | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/core/common/random_manager.cpp b/src/core/common/random_manager.cpp
index d5962cddd..c9602bded 100644
--- a/src/core/common/random_manager.cpp
+++ b/src/core/common/random_manager.cpp
@@ -65,17 +65,17 @@ RandomManager::RandomManager(void)
 
 #ifndef OPENTHREAD_RADIO
     sEntropy.Init();
-#endif
+    sCtrDrbg.Init();
 
+    error = Random::Crypto::FillBuffer(reinterpret_cast<uint8_t *>(&seed), sizeof(seed));
+    assert(error == OT_ERROR_NONE);
+#else
     error = otPlatEntropyGet(reinterpret_cast<uint8_t *>(&seed), sizeof(seed));
     assert(error == OT_ERROR_NONE);
+#endif
 
     sPrng.Init(seed);
 
-#ifndef OPENTHREAD_RADIO
-    sCtrDrbg.Init();
-#endif
-
 exit:
     sInitCount++;
 }