From 3752347f1489d9e8208a38d073e443a0b5ef4391 Mon Sep 17 00:00:00 2001
From: David Garske <david@wolfssl.com>
Date: Tue, 2 Mar 2021 15:04:01 -0800
Subject: [PATCH] Improve the random logic for the INTIME RTOS RNG.

---
 wolfcrypt/src/random.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/wolfcrypt/src/random.c b/wolfcrypt/src/random.c
index cc1e33dee..bd637173f 100644
--- a/wolfcrypt/src/random.c
+++ b/wolfcrypt/src/random.c
@@ -2237,16 +2237,27 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
     int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
     {
         uint32_t randval;
-        word32 len = sizeof(randval);
+        word32 len;
 
         if (output == NULL) {
             return BUFFER_E;
         }
 
+    #ifdef INTIMEVER
+        /* If INTIMEVER exists then it is INTIME RTOS v6 or later */
+        #define INTIME_RAND_FUNC arc4random
+        len = 4;
+    #else
+        /* v5 and older */
+        #define INTIME_RAND_FUNC rand
+        srand(time(0));
+        len = 2; /* don't use all 31 returned bits */
+    #endif
+
         while (sz > 0) {
             if (sz < len)
                 len = sz;
-            randval = rand(); /* returns 32-bits of random */
+            randval = INTIME_RAND_FUNC();
             XMEMCPY(output, &randval, len);
             output += len;
             sz -= len;