su_uniqueid.c: using /dev/urandom when possible.

darcs-hash:20060925212918-65a35-1951e7bab6d060b47d28e1cee6080e59a5451a0e.gz

libsofia-sip-ua/su/su_uniqueid.c

@@ -286,10 +286,14 @@ isize_t su_guid_sprintf(char* buf, size_t len, su_guid_t const *v)
 int su_randint(int lb, int ub)
 {
   unsigned rnd = 0;
-
+  
   if (!initialized) init(); 
 
-  rnd = random();
+  if (urandom) {
+    fread(&rnd, 1, sizeof rnd, urandom);
+  }
+  else
+    rnd = random();
 
   if (ub - lb + 1 != 0)
     rnd %= (ub - lb + 1);
@@ -303,7 +307,10 @@ void *su_randmem(void *mem, size_t siz)
 
   if (!initialized) init(); 
 
-  for (i = 0; i < siz; i++) {
+  if (urandom) {
+    fread(mem, 1, siz, urandom);
+  }
+  else for (i = 0; i < siz; i++) {
     unsigned r = random();
     ((char *)mem)[i] = (r >> 24) ^ (r >> 16) ^ (r >> 8) ^ r;
   }
@@ -318,7 +325,14 @@ void *su_randmem(void *mem, size_t siz)
  */
 uint32_t su_random(void)
 {
+  uint32_t rnd;
+
   if (!initialized) init(); 
 
-  return (uint32_t)random();
+  if (urandom)
+    fread(&rnd, 1, sizeof rnd, urandom);
+  else
+    rnd = (uint32_t)random();
+
+  return rnd;
 }