File

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−-- 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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−
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−local random = require "util.random";
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−local random_bytes = random.bytes;
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−local hex = require "util.hex".to;
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−local m_ceil = math.ceil;
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−
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−local function get_nibbles(n)
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−	return hex(random_bytes(m_ceil(n/2))):sub(1, n);
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−end
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−
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−local function get_twobits()
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−	return ("%x"):format(random_bytes(1):byte() % 4 + 8);
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−end
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−
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−local function generate()
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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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−
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−return {
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−	get_nibbles=get_nibbles;
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−	generate = generate ;
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−	-- COMPAT
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−	seed = random.seed;
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−};