add entropy steps for VxWorks

IDE/WORKBENCH/README.md

@@ -38,6 +38,18 @@ click "Edit". Enter the above define to the end of the line.
 6. Copy the certs folder in ```<path_to_wolfssl>/``` to the Wind River Workbench
 workspace folder. This is where the simulator looks for the filesystem.
 
+7. Include Entropy:
+
+    - Create a new project, similar to step 1 but choose VxWorks Source Build
+    Project as the type of project instead of VxWorks Image Project.
+    - In the project directory, double click "Source Build Configuration" and
+    under os > core > CORE\_KERNEL Menu > VxWorks Kernel Component
+    Configuration find "Inject entropy in interrupts". Double click this.
+    - Go back to your VIP project. Right click the project and select "Properties".
+    - In "Properties", select "Project References". Check the box next to the
+    new project you created. Click "Ok".
+    - Rebuild the project.
+
 ####2 Testing wolfSSL with VxWorks:
 #####2.1 wolfCrypt Test and Benchmark Applications
 The wolfCrypt test application will test each of the cryptographic algorithms

wolfcrypt/src/random.c

@@ -1265,26 +1265,22 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
         return 0;
     }
 
-#elif defined(WOLFSSL_VXWORKS) && defined(VXWORKS_SIM)
+#elif defined(WOLFSSL_VXWORKS)
 
     #include <randomNumGen.h>
 
     int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) {
         STATUS        status;
-        unsigned char seed[1024];
+
+        #ifdef VXWORKS_SIM
+            /* cannot generate true entropy with VxWorks simulator */
+            #warning "not enough entropy, simulator for testing only"
             int i = 0;
 
-        /* cannot generate true entropy with VxWorks simulator */
+            for (i = 0; i < 1000; i++) {
-        #warning "VxWorks simulator for testing purposes only!"
+                randomAddTimeStamp();
-
-        for (i = 0; i < sizeof(seed); i++) {
-            seed[i] = i * 3 % 256;
-        }
-        /* build entropy */
-        (void) randAdd(seed, 0, 0);
-        for (i = 4; i <= sizeof(seed); i*=2) {
-            (void) randAdd (seed, i - 1, i);
             }
+        #endif
 
         status = randBytes (output, sz);
         if (status == ERROR) {