From 84f0d2f774eb5de986e11fe5bb313ec4c07d0027 Mon Sep 17 00:00:00 2001
From: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
Date: Wed, 16 Oct 2013 12:50:40 +0300
Subject: [PATCH] If libgcrypt is available but /dev/urandom is not, use
 libgcrypt for RNG

---
 src/core/misc.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/core/misc.cpp b/src/core/misc.cpp
index c606347f..ce0ea9af 100644
--- a/src/core/misc.cpp
+++ b/src/core/misc.cpp
@@ -23,6 +23,10 @@
 #include <cstring>
 #include <boost/filesystem.hpp>
 
+#ifdef USE_LIBGCRYPT_SHA256
+#include <gcrypt.h>
+#endif
+
 namespace
 {
 	std::string rseed;
@@ -119,6 +123,16 @@ void set_random_seed() throw(std::bad_alloc)
 			return;
 		}
 	}
+	//If libgcrypt is available, use that.
+#ifdef USE_LIBGCRYPT_SHA256
+	{
+		char buf[64];
+		gcry_randomize((unsigned char*)buf, sizeof(buf), GCRY_STRONG_RANDOM);
+		std::string s(buf, sizeof(buf));
+		set_random_seed(s);
+		return;
+	}
+#endif
 	//Fall back to time.
 	std::ostringstream str;
 	str << collect_identifying_information() << " " << time(NULL);