prosody
4e060ae8520b
util/random.lua

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util/random.lua @ 11207:4e060ae8520b

util.error: Remove a stray word from a comment Earlier in the process the namespace could be given in the registry table, the comment would have read > registry can be given as second argument if namespace is either not > used or is given in the registry table The word seems to have been left when this method was scrapped for being complicated and redundant.
author Kim Alvefur <zash@zash.se>
date Sat, 14 Nov 2020 22:22:46 +0100
parent 10016:af8c514e5cf7
child 12446:e54b8a5e35ad
line wrap: on
line source

-- 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";
};