From a58e4f7b1f9df569085cc7c7175bf5c5f06dd1f9 Mon Sep 17 00:00:00 2001
From: Yossi Levy <Yossi.Levy@arm.com>
Date: Thu, 31 Jan 2019 17:26:26 +0200
Subject: [PATCH] Adding MBEDTLS_ENTROPY_NV_SEED macro check in device key to
 allow key derivation when there is no TRNG but there is DRBG

---
 features/device_key/source/DeviceKey.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/features/device_key/source/DeviceKey.cpp b/features/device_key/source/DeviceKey.cpp
index 3d9b8dac07..7491add70a 100644
--- a/features/device_key/source/DeviceKey.cpp
+++ b/features/device_key/source/DeviceKey.cpp
@@ -260,7 +260,7 @@ int DeviceKey::generate_key_by_random(uint32_t *output, size_t size)
         return DEVICEKEY_INVALID_PARAM;
     }
 
-#if DEVICE_TRNG
+#if defined(DEVICE_TRNG) || defined(MBEDTLS_ENTROPY_NV_SEED)
     uint32_t test_buff[DEVICE_KEY_32BYTE / sizeof(int)];
     mbedtls_entropy_context *entropy = new mbedtls_entropy_context;
     mbedtls_entropy_init(entropy);
@@ -276,6 +276,7 @@ int DeviceKey::generate_key_by_random(uint32_t *output, size_t size)
 
     mbedtls_entropy_free(entropy);
     delete entropy;
+
 #endif
 
     return ret;