Add wrappers function for libc random()

On windows, it's called something different.

1 files changed, 24 insertions, 0 deletions

diff --git a/src/common/compat.c b/src/common/compat.c
index 20394b4c5d..4d556a85e6 100644
--- a/src/common/compat.c
+++ b/src/common/compat.c
@@ -1679,6 +1679,30 @@ tor_lookup_hostname(const char *name, uint32_t *addr)
   return -1;
 }
 
+/** Initialize the insecure libc RNG. */
+void
+tor_init_weak_random(unsigned seed)
+{
+#ifdef MS_WINDOWS
+  srand(seed);
+#else
+  srandom(seed);
+#endif
+}
+
+/** Return a randomly chosen value in the range 0..TOR_RAND_MAX.  This
+ * entropy will not be cryptographically strong; do not rely on it
+ * for anything an adversary should not be able to predict. */
+long
+tor_weak_random(void)
+{
+#ifdef MS_WINDOWS
+  return rand();
+#else
+  return random();
+#endif
+}
+
 /** Hold the result of our call to <b>uname</b>. */
 static char uname_result[256];
 /** True iff uname_result is set. */