prosody
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util/random.lua

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util/random.lua @ 10014:5d2f7144fa12 0.11

util.random: Handle unlikely read errors from /dev/urandom (see #1313)
author Kim Alvefur <zash@zash.se>
date Sat, 18 May 2019 17:28:21 +0200
parent 8243:292f61d9d30a
child 10015:8297408db58b
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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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parents: 7114
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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
3d2c2f0809ee util.crand: C binding to one of OpenSSL, Linux getrandom() or OpenBSD arc4random() CSPRNG
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11
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51cf09bb74eb util.random: Restore friendlier error from 0.9/util.uuid
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12 local urandom, urandom_err = io.open("/dev/urandom", "r");
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13
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
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14 local function bytes(n)
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5d2f7144fa12 util.random: Handle unlikely read errors from /dev/urandom (see #1313)
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15 local data, err = urandom:read(n);
5d2f7144fa12 util.random: Handle unlikely read errors from /dev/urandom (see #1313)
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16 if not data then
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17 error("Unable to retrieve data from secure random number generator (/dev/urandom): "..err);
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18 end
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19 return data;
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20 end
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21
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51cf09bb74eb util.random: Restore friendlier error from 0.9/util.uuid
Kim Alvefur <zash@zash.se>
parents: 7083
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22 if not urandom then
51cf09bb74eb util.random: Restore friendlier error from 0.9/util.uuid
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23 function bytes()
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24 error("Unable to obtain a secure random number generator, please see https://prosody.im/doc/random ("..urandom_err..")");
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25 end
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26 end
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27
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28 return {
bd812a7713ad util.random: Generic util lib for generating strings of random bytes
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29 bytes = bytes;
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177873dc9cf3 util.random: Add a _source field to match util.crand
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30 _source = "/dev/urandom";
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31 };