Mercurial > xmpp-mass-pep-downloader / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util/random.lua	Thu Dec 03 17:05:27 2020 +0000
@@ -0,0 +1,35 @@
+-- Prosody IM
+-- Copyright (C) 2008-2014 Matthew Wild
+-- Copyright (C) 2008-2014 Waqas Hussain
+--
+-- This project is MIT/X11 licensed. Please see the
+-- COPYING file in the source package for more information.
+--
+
+local ok, crand = pcall(require, "util.crand");
+if ok then return crand; end
+
+local urandom, urandom_err = io.open("/dev/urandom", "r");
+
+local function bytes(n)
+	local data, err = urandom:read(n);
+	if not data then
+		if err then
+			error("Unable to retrieve data from secure random number generator (/dev/urandom): "..tostring(err));
+		else
+			error("Secure random number generator (/dev/urandom) returned an end-of-file condition");
+		end
+	end
+	return data;
+end
+
+if not urandom then
+	function bytes()
+		error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
+	end
+end
+
+return {
+	bytes = bytes;
+	_source = "/dev/urandom";
+};