prosody
641e3b7a6a39
util/random.lua

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util/random.lua @ 10519:641e3b7a6a39 0.11

util.pubsub: Pass subscribers trough a filter callback
author Kim Alvefur <zash@zash.se>
date Thu, 06 Jun 2019 18:13:46 +0200
parent 10016:af8c514e5cf7
child 12446:e54b8a5e35ad
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bd812a7713ad util.random: Generic util lib for generating strings of random bytes
Matthew Wild <mwild1@gmail.com>
parents:
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1 -- Prosody IM
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
Matthew Wild <mwild1@gmail.com>
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2 -- Copyright (C) 2008-2014 Matthew Wild
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
Matthew Wild <mwild1@gmail.com>
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3 -- Copyright (C) 2008-2014 Waqas Hussain
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
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4 --
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
Matthew Wild <mwild1@gmail.com>
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5 -- This project is MIT/X11 licensed. Please see the
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
Matthew Wild <mwild1@gmail.com>
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6 -- COPYING file in the source package for more information.
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
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7 --
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
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8
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3d2c2f0809ee util.crand: C binding to one of OpenSSL, Linux getrandom() or OpenBSD arc4random() CSPRNG
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9 local ok, crand = pcall(require, "util.crand");
3d2c2f0809ee util.crand: C binding to one of OpenSSL, Linux getrandom() or OpenBSD arc4random() CSPRNG
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10 if ok then return crand; end
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11
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12 local urandom, urandom_err = io.open("/dev/urandom", "r");
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13
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14 local function bytes(n)
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15 local data, err = urandom:read(n);
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16 if not data then
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17 if err then
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18 error("Unable to retrieve data from secure random number generator (/dev/urandom): "..tostring(err));
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19 else
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20 error("Secure random number generator (/dev/urandom) returned an end-of-file condition");
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21 end
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22 end
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23 return data;
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24 end
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25
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26 if not urandom then
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27 function bytes()
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28 error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
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29 end
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30 end
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31
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32 return {
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
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33 bytes = bytes;
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34 _source = "/dev/urandom";
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35 };