From d76092bbefdf79aa22e18af0bbae4a6bc4b5a169 Mon Sep 17 00:00:00 2001
From: "Alfred E. Heggestad" <aeh@db.org>
Date: Fri, 15 Apr 2016 07:09:59 +0000
Subject: [PATCH] sys: add support for arc4random

thanks to Dmitrij D. Czarkoff for the original patch
---
 mk/re.mk       | 5 +++++
 src/sys/rand.c | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/mk/re.mk b/mk/re.mk
index d92bf26..9dd0297 100644
--- a/mk/re.mk
+++ b/mk/re.mk
@@ -290,6 +290,7 @@ ifeq ($(OS),openbsd)
 	AR		:= ar
 	AFLAGS		:= cru
 	HAVE_KQUEUE	:= 1
+	HAVE_ARC4RANDOM	:= 1
 endif
 ifeq ($(OS),win32)
 	CFLAGS		+= -DWIN32 -D_WIN32_WINNT=0x0501 -D__ssize_t_defined
@@ -578,6 +579,10 @@ CFLAGS  += -DHAVE_GAI_STRERROR
 endif
 endif
 
+ifneq ($(HAVE_ARC4RANDOM),)
+CFLAGS  += -DHAVE_ARC4RANDOM
+endif
+
 
 ##############################################################################
 #
diff --git a/src/sys/rand.c b/src/sys/rand.c
index f6aa17f..4da7076 100644
--- a/src/sys/rand.c
+++ b/src/sys/rand.c
@@ -85,6 +85,8 @@ uint32_t rand_u32(void)
 			      ERR_GET_REASON(ERR_get_error()));
 		ERR_clear_error();
 	}
+#elif defined(HAVE_ARC4RANDOM)
+	v = arc4random();
 #elif defined(WIN32)
 	v = (rand() << 16) + rand(); /* note: 16-bit rand */
 #else
@@ -161,6 +163,8 @@ void rand_bytes(uint8_t *p, size_t size)
 			      ERR_GET_REASON(ERR_get_error()));
 		ERR_clear_error();
 	}
+#elif defined (HAVE_ARC4RANDOM)
+	arc4random_buf(p, size);
 #else
 	while (size--) {
 		p[size] = rand_u32();