1 files changed, 31 insertions, 0 deletions
diff --git a/src/lib/intmath/weakrng.h b/src/lib/intmath/weakrng.h
new file mode 100644
index 0000000000..e26bf58cbb
--- /dev/null
+++ b/src/lib/intmath/weakrng.h
@@ -0,0 +1,31 @@
+/* Copyright (c) 2003, Roger Dingledine
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2019, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * \file weakrng.h
+ *
+ * \brief Header for weakrng.c
+ **/
+
+#ifndef TOR_WEAKRNG_H
+#define TOR_WEAKRNG_H
+
+#include "lib/cc/torint.h"
+
+/* ===== Insecure rng */
+typedef struct tor_weak_rng_t {
+  uint32_t state;
+} tor_weak_rng_t;
+
+#define TOR_WEAK_RNG_INIT {383745623}
+#define TOR_WEAK_RANDOM_MAX (INT_MAX)
+void tor_init_weak_random(tor_weak_rng_t *weak_rng, unsigned seed);
+int32_t tor_weak_random(tor_weak_rng_t *weak_rng);
+int32_t tor_weak_random_range(tor_weak_rng_t *rng, int32_t top);
+/** Randomly return true according to <b>rng</b> with probability 1 in
+ * <b>n</b> */
+#define tor_weak_random_one_in_n(rng, n) (0==tor_weak_random_range((rng),(n)))
+
+#endif