added entropy, wc_GenerateSeed() for VxWorks

wolfcrypt/src/random.c

@@ -1265,6 +1265,32 @@ int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
         return 0;
     }
 
+#elif defined(WOLFSSL_VXWORKS)
+
+    #include <randomNumGen.h>
+
+    int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) {
+        STATUS        status;
+        unsigned char seed[1024];
+        int           i = 0;
+
+        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);
+        }
+
+        status = randBytes (output, sz);
+        if (status == ERROR) {
+            return status;
+        }
+
+        return 0;
+    }
+
 #elif defined(CUSTOM_RAND_GENERATE)
 
    /* Implement your own random generation function