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util/random.lua @ 11189:0ff148362a3d 0.11
util.dbuffer: Optimize :sub() and :byte()
author | Matthew Wild <mwild1@gmail.com> |
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date | Wed, 28 Oct 2020 14:21:09 +0000 |
parent | 10016:af8c514e5cf7 |
child | 12446:e54b8a5e35ad |
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-- Prosody IM -- Copyright (C) 2008-2014 Matthew Wild -- Copyright (C) 2008-2014 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local ok, crand = pcall(require, "util.crand"); if ok then return crand; end local urandom, urandom_err = io.open("/dev/urandom", "r"); local function bytes(n) local data, err = urandom:read(n); if not data then if err then error("Unable to retrieve data from secure random number generator (/dev/urandom): "..tostring(err)); else error("Secure random number generator (/dev/urandom) returned an end-of-file condition"); end end return data; end if not urandom then function bytes() error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")"); end end return { bytes = bytes; _source = "/dev/urandom"; };