util/random.lua
author Kim Alvefur <zash@zash.se>
Mon, 22 Feb 2016 18:44:43 +0100
changeset 7190 3d2c2f0809ee
parent 7117 51cf09bb74eb
child 8244 e7496cff1215
child 8245 177873dc9cf3
permissions -rw-r--r--
util.crand: C binding to one of OpenSSL, Linux getrandom() or OpenBSD arc4random() CSPRNG

-- 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 seed()
end

local function bytes(n)
	return urandom:read(n);
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 {
	seed = seed;
	bytes = bytes;
};