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Red Hat Bugzilla – Attachment 871096 Details for
Bug 982660
audio-entropyd doesn't work with or without pulseaudio
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Configuration file for 2.0.3 that works with latest patch.
audio-entropyd (text/plain), 11.33 KB, created by
stan
on 2014-03-05 18:47:45 UTC
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Description:
Configuration file for 2.0.3 that works with latest patch.
Filename:
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Creator:
stan
Created:
2014-03-05 18:47:45 UTC
Size:
11.33 KB
patch
obsolete
># This is the configuration file for audio-entropyd's initscript. ># Each option must be entered on a line by itself as if it was ># being entered on the command line. The dash must be in the ># first column. ># Anything after a hash (#) mark and blank lines are ignored. ># Command line options override options in this file. ># And this has nothing to do with the options, but you should test the statistical quality of ># audio-entropyd on your setup with cat /dev/random | rngtest -c10000 or another practical number ># The test above takes about 6 hours on my system at 44100 frame rate with entropy-filter=0. ># RG Brown has a good explanation of the relationship of statistics with randomness in his man pages for dieharder. ># I get from 3 to 11 errors on runs. Statistically, this is expected, but really for good ># cryptographic numbers we don't actually want random numbers, because they include the tails that ># aren't crpytographically secure. Think patterns like 20 zeros or ones in a row, etc. So, you'll have to decide ># what seems reasonable. I think the best way to use this randomness is to make the /dev/urandom device ># more unpredictable. When audio-entropyd is running, I increase /proc/sys/kernel/random/write_wakeup_threshold ># to 3840 and I lower /proc/sys/kernel/random/urandom_min_reseed_secs to 5, ># providing more entropy and allowing /dev/urandom to take entropy from the pool more often. > ># Valid options are the following, also see with audio-entropyd -h or --help ># >#--device=plughw:0 #default, you can use hw:0, but your device has to support 32 bit signed output natively >#--device plughw 0 # you can also leave a space in long options like this does, and short options do >--device=plughw:0 >#-d plughw:0 ># ># I haven't actually compared the filters to see if they extract the *same* entropy. It seems unlikely. ># All of the filters have zero errors in rngtest out to at least 10, 200,000 bits. The faster ones have been tested out ># to about 10000 samples, and have an error rate about .1%. That's the same as /dev/urandom, and is probably the ># statistical error rate of the generator on the tests being used. ># rngtest isn't actually testing audio-entropyd, ># just it's rate of contribution to the kernel entropy pool which is used to generate the bits that rngtest gets from ># /dev/random. I test with no X, user idle, no network, overnight. Nearly all the entropy in the pool will be ># from audio-entropyd. ># I recommend 30, 23, and 8. 21 and 0 also are OK. But whichever test you use, you should tune for *your* device. > > # This test uses the distance that the channels are apart in absolute normalized terms to determine if an event should generate a bit of entropy. > # I consider this test to be very good once it is tuned to your device. Random variations in the distance between > # the channels triggers the generation of a random bit based on the time. >--entropy-filter=30 # determines how different channels are in absolute normalized terms. If over threshold, sets bit using ># program run time mod 2. > # approximately 1 bit / 44 frames with threshold of .7 > # approximately 1 bit / 18 frames with threshold of .5 >--upper-threshold=.5 # this determines the absolute normalized distance the channels have to be apart, [0. - 2.], before a bit is generated. > > # These tests use the order between channels to determine events which generate entropy >#--entropy-filter=10 # original test, doesn't work well on my device > # about 1 bit of entropy / 100 frames > >#--entropy-filter=11 # original test, using dc offset to remove bias instead of a previous value ># approximately 1 bit / 14 frames > >#--entropy-filter=12 # original test, uses time mod 2 to set bit rather than order conditions and alternator. ># approximately 1 bit / 100 frames > > # These tests use absolute normalized distance change between channels to determine events which generate entropy >#--entropy-filter=0 # first difference of difference between channels, less more or more less > # about 1 bit / 8 frames with lower-threshold == .0 and upper-threshold == .0 >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=1 # second difference == 0, ~ 1 bit / 17 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=2 # second difference != 0, ~ 1 bit / 13 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=3 # use 5 sample differences, pattern less more less more or more less more less, ~ 1 bit / 34 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=4 # use 5 sample differences, pattern less more more less or more less less more, ~ 1 bit / 55 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=5 # use 5 sample differences, pattern less more same less or more less same more, ~ 1 bit / 44 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=6 # use 5 sample differences, pattern same same more same or same same less same, ~ 1 bit / 100 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=7 # use 5 sample differences, pattern same same more or same same less, ~ 1 bit / 30 frames >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > >#--entropy-filter=8 # first difference of difference between channels, less more or more less > # this version uses time mod 2 to set the bit rather than the condition. > # about 1 bit / 10 frames with lower-threshold == -.05 and upper-threshold == .05 > # about 1 bit / 10 frames with lower-threshold == -.10 and upper-threshold == .10 > # about 1 bit / 13 frames with lower-threshold == -.20 and upper-threshold == .20 >#--lower-threshold=-.20 # if the absolute normalized difference between channels isn't less than this, doesn't qualify as change >#--upper-threshold=.20 # if the absolute normalized difference between channels isn't greater than this, doesn't qualify as change > > # These tests use changes in individual channels normalized values to determine events which generate entropy >#--entropy-filter=20 # individual channel, each changes one less, one more > # about 1 bit / 26 frames with lower-threshold == -.1 and upper-threshold == .1 >#--lower-threshold=-.1 # if the actual change in normalized value is less than this, is considered a change for purposes of test >#--upper-threshold=.1 # if the actual change in normalized value is more than this, is considered a change for purposes of test > >#--entropy-filter=21 # individual channel, one relatively constant, one changes > # about 1 bit / 25 frames with lower-threshold == .2 and upper-threshold == .5 >#--lower-threshold=.15 # if the change in absolute normalized value is less than this, considered constant for purposes of test >#--upper-threshold=.40 # if the change in normalized value is more than this, is considered a change for purposes of test > >#--entropy-filter=22 # individual channel, each changes one less, one more, uses time mod 2 to set bit if either occurs > # about 1 bit / 30 frames with lower-threshold == -.1 and upper-threshold == .1 >#--lower-threshold=-.1 # if the change in normalized value is less than this, considered a change for purposes of test >#--upper-threshold=.1 # if the change in normalized value is more than this, is considered a change for purposes of test > >#--entropy-filter=23 # individual channel, one relatively constant, one changes, uses time mod 2 to set bit if either occurs > # about 1 bit / 26 frames with lower-threshold == .2 and upper-threshold == .5 > # about 1 bit / 13 frames with lower-threshold == .15 and upper-threshold == .4 >#--lower-threshold=.15 # if the change in absolute normalized value is less than this, considered constant for purposes of test >#--upper-threshold=.4 # if the change in normalized value is more than this, is considered a change for purposes of test > >#-e 0 ># ># This sets the threshold for any entropy filter tests that use normalized distance between the channels ># Unfortunately, they have different requirements to be meaningful for different entropy filters. If you ># are going to use them, it is best to look at the code, though I've set reasonable defaults above under ># each filter that requires them. >#--lower-threshold=.0 # default >#--lower-threshold=.25 >#-l .05 ># This sets the threshold for any entropy filter tests that use normalized distance between the channels >#--upper-threshold=.5 # default >#--upper-threshold=.7 >#-u .5 ># ># ># pausing and resuming is the default if the device supports it. This option causes audio-entropyd ># to open and close the device for each sample it captures, and throws away skip-size samples each time ># before capturing the sample. This is very inefficient, but ensures that the data gathered is always ># from regular operation. >#--always_close >#-a ># >#--do-not-fork # fork is default >#-n ># >#--sample-rate=22050 # default >--sample-rate=44100 >#-r 44100 ># >#--sample-size=11072 # default >#--sample-size=22144 >#-z 11072 ># >#--skip-size=11025 # default >--skip-size=5555 >#-s 11025 ># >#--internal-test # default is not to do internal testing. >#The kernel pool conditions the entropy data it is passed by audio-entropyd regardless. >#--internal-test >#-i ># >#--store-in-file="/tmp/audio_entropyd_output" # default is to not store in a file, but to fill the entropy pool >#-f "/tmp/audio_entropyd_output" ># >#--verbose # default is no messages, more repeats, more messages, max 3 has an effect >#--verbose >#--verbose >#-v >#-vv >#-vvv ># >#--help >#-h
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