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util.uuid: Use /dev/urandom

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This commit is contained in:
Kim Alvefur 2016-01-06 02:46:47 +01:00
parent 58885565fe
commit 8a8f379272
1 changed files with 16 additions and 27 deletions
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43
util/uuid.lua
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@ -6,44 +6,33 @@
-- COPYING file in the source package for more information.
--
local tostring = tostring;
local os_time = os.time;
local os_clock = os.clock;
local sha1 = require "util.hashes".sha1;
local error = error;
local round_up = math.ceil;
local urandom, urandom_err = io.open("/dev/urandom", "r+");
module "uuid"
local last_uniq_time = 0;
local function uniq_time()
local new_uniq_time = os_time();
if last_uniq_time >= new_uniq_time then new_uniq_time = last_uniq_time + 1; end
last_uniq_time = new_uniq_time;
return new_uniq_time;
end
local function new_random(x)
return sha1(x..os_clock()..tostring({}), true);
end
local buffer = new_random(uniq_time());
local function _seed(x)
buffer = new_random(buffer..x);
end
local function get_nibbles(n)
if #buffer < n then _seed(uniq_time()); end
local r = buffer:sub(0, n);
buffer = buffer:sub(n+1);
return r;
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(get_nibbles(1):byte() % 4 + 8);
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
seed = _seed;
function seed(x)
urandom:write(x);
urandom:flush();
end
return _M;