prosody
16b47c3b44f3
util/random.lua

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util/random.lua @ 13011:16b47c3b44f3

mod_invites_register: Allow roles to be an ordered list, first being primary Part of an update to mod_invites and friends to the new authz and roles. Invites with roles in the old way will need to be migrated, but with invites often being short lived it is probably not a long-lived problem.
author Kim Alvefur <zash@zash.se>
date Thu, 30 Mar 2023 11:05:40 +0200
parent 12975:d10957394a3c
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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, "prosody.util.crand");
if ok and pcall(crand.bytes, 1) 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";
};