mirror of https://github.com/bjc/prosody
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
1.0 KiB
38 lines
1.0 KiB
-- Prosody IM
|
|
-- Copyright (C) 2008-2010 Matthew Wild
|
|
-- Copyright (C) 2008-2010 Waqas Hussain
|
|
--
|
|
-- This project is MIT/X11 licensed. Please see the
|
|
-- COPYING file in the source package for more information.
|
|
--
|
|
|
|
local error = error;
|
|
local round_up = math.ceil;
|
|
local urandom, urandom_err = io.open("/dev/urandom", "r+");
|
|
|
|
module "uuid"
|
|
|
|
local function get_nibbles(n)
|
|
local binary_random = urandom:read(round_up(n/2));
|
|
local hex_random = binary_random:gsub(".",
|
|
function (x) return ("%02x"):format(x:byte()) end);
|
|
return hex_random:sub(1, n);
|
|
end
|
|
local function get_twobits()
|
|
return ("%x"):format(urandom:read(1):byte() % 4 + 8);
|
|
end
|
|
|
|
function generate()
|
|
if not urandom then
|
|
error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
|
|
end
|
|
-- generate RFC 4122 complaint UUIDs (version 4 - random)
|
|
return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
|
|
end
|
|
|
|
function seed(x)
|
|
urandom:write(x);
|
|
urandom:flush();
|
|
end
|
|
|
|
return _M;
|
|
|