From f5673c7cc06db7f252ff3e787c987fa5fae627e9 Mon Sep 17 00:00:00 2001
From: Frank Denis <github@pureftpd.org>
Date: Mon, 20 Feb 2017 21:12:33 +0100
Subject: [PATCH] Avoid negating unsigned values

---
 src/libsodium/randombytes/randombytes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libsodium/randombytes/randombytes.c b/src/libsodium/randombytes/randombytes.c
index 20c063ec..a40b78e1 100644
--- a/src/libsodium/randombytes/randombytes.c
+++ b/src/libsodium/randombytes/randombytes.c
@@ -140,7 +140,7 @@ randombytes_uniform(const uint32_t upper_bound)
     if (upper_bound < 2) {
         return 0;
     }
-    min = (uint32_t) (-upper_bound % upper_bound);
+    min = (1U + ~upper_bound) % upper_bound;
     do {
         r = randombytes_random();
     } while (r < min);