• file
• latest
• revisions
• annotate
• diff
• comparison
• raw

util/random.lua@550f506de75a (annotated)

util/random.lua

Thu, 03 Dec 2020 17:05:27 +0000

author

Matthew Wild <mwild1@gmail.com>

date

Thu, 03 Dec 2020 17:05:27 +0000

changeset 0

550f506de75a

permissions

-rw-r--r--

Initial commit

0 550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	1	-- Prosody IM
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	2	-- Copyright (C) 2008-2014 Matthew Wild
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	3	-- Copyright (C) 2008-2014 Waqas Hussain
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	4	--
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	5	-- This project is MIT/X11 licensed. Please see the
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	6	-- COPYING file in the source package for more information.
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	7	--
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	8
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	9	local ok, crand = pcall(require, "util.crand");
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	10	if ok then return crand; end
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	11
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	12	local urandom, urandom_err = io.open("/dev/urandom", "r");
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	13
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	14	local function bytes(n)
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	15	local data, err = urandom:read(n);
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	16	if not data then
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	17	if err then
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	18	error("Unable to retrieve data from secure random number generator (/dev/urandom): "..tostring(err));
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	19	else
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	20	error("Secure random number generator (/dev/urandom) returned an end-of-file condition");
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	21	end
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	22	end
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	23	return data;
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	24	end
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	25
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	26	if not urandom then
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	27	function bytes()
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	28	error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	29	end
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	30	end
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	31
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	32	return {
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	33	bytes = bytes;
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	34	_source = "/dev/urandom";
550f506de75a Initial commit Matthew Wild <mwild1@gmail.com> parents: diff changeset	35	};