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38 lines
1 KiB
Lua
38 lines
1 KiB
Lua
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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local error = error;
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local round_up = math.ceil;
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local urandom, urandom_err = io.open("/dev/urandom", "r+");
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module "uuid"
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local function get_nibbles(n)
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local binary_random = urandom:read(round_up(n/2));
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local hex_random = binary_random:gsub(".",
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function (x) return ("%02x"):format(x:byte()) end);
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return hex_random:sub(1, n);
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end
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local function get_twobits()
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return ("%x"):format(urandom:read(1):byte() % 4 + 8);
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end
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function generate()
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if not urandom then
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error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
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end
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-- generate RFC 4122 complaint UUIDs (version 4 - random)
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return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
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end
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function seed(x)
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urandom:write(x);
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urandom:flush();
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end
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return _M;
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