Commit Graph

39 Commits

Author SHA1 Message Date
Michael Niedermayer 7525517593 libavutil/random_seed: Ensure that get_generic_seed() spends at least 1/32 sec gathering entropy
This may fix the failures on windows

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-12-31 17:20:06 +01:00
Michael Niedermayer c4152fc42e avutil/random_seed: Reduce the time needed on systems with very low precission clock()
This should fix issues on BSD
CLOCKS_PER_SEC is 128 on BSD while SUSv2 requires it to be a million

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-12-24 14:46:25 +01:00
Michael Niedermayer da73d95bad avutil/random_seed: Improve get_generic_seed() with higher precission clock()
Tested-by: Thomas Turner <thomastdt@googlemail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-12-22 12:40:48 +01:00
Michael Niedermayer 54931fd0fb avutil/random_seed: Use uint64 instead of uint8 for struct to avoid potential alignment issues
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-12-21 03:37:54 +01:00
Derek Buitenhuis 96d616052b Merge commit 'd12b5b2f135aade4099f4b26b0fe678656158c13'
* commit 'd12b5b2f135aade4099f4b26b0fe678656158c13':
  build: Split test programs off into separate files

Some conversions done by: James Almer <jamrial@gmail.com>
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
2016-05-11 19:13:03 +01:00
Michael Niedermayer 2540d884f3 avutil/random_seed: Add the runtime in cycles of the main loop to the entropy pool
This should theoretically improve the randomness slightly

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2016-03-10 22:56:37 +01:00
Ganesh Ajjanagadde 39f8c7961d lavu/random_seed: use arc4random() when available
arc4random() was designed as a superior interface for system random
number generation, designed for OpenBSD and subsequently incorporated by
other BSD's, Mac OS X, and some non-standard libc's. It is thus an improvement to
use it whenever available.

As a side note, this may or may not get included in glibc, and there is
a proposal to create a posix_random family based on these ideas:
http://austingroupbugs.net/view.php?id=859.

Tested on Mac OS X.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
2015-12-17 08:12:41 -08:00
Matthew Oliver 66627075d9 msvc: fix implicitly declared read/close.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2014-08-02 14:52:17 +02:00
Michael Niedermayer 00f25e0a99 Merge commit '01d245ef4392152dbdc78a6ba4dfa0a6e8b08e6f'
* commit '01d245ef4392152dbdc78a6ba4dfa0a6e8b08e6f':
  random_seed: Rewrite the generic clock() based seed code

Conflicts:
	libavutil/random_seed.c

See: 66531c75d3
Merged-by: Michael Niedermayer <michaelni@gmx.at>
2014-01-06 22:12:29 +01:00
Michael Niedermayer 01d245ef43 random_seed: Rewrite the generic clock() based seed code
The new code is faster and reuses the previous state in case of
multiple calls.

The previous code could easily end up in near-infinite loops,
if the difference between two clock() calls never was larger than
1.

This makes fate-parseutils finish in finite time when run in wine,
if CryptGenRandom isn't available (which e.g. isn't available if
targeting Windows RT/metro).

Patch originally by Michael Niedermayer but with some modifications
by Martin Storsjö.

Signed-off-by: Martin Storsjö <martin@martin.st>
2014-01-06 18:53:58 +02:00
Michael Niedermayer 579a137897 Merge commit '880391ed2d2faf796ca3a16f63cec69767546a21'
* commit '880391ed2d2faf796ca3a16f63cec69767546a21':
  libavutil: use avpriv_open()

Conflicts:
	libavutil/random_seed.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-08 11:18:17 +02:00
Rémi Denis-Courmont 880391ed2d libavutil: use avpriv_open()
Signed-off-by: Anton Khirnov <anton@khirnov.net>
2013-08-07 21:12:28 +02:00
Michael Niedermayer 43cce41267 Merge commit '0a75d1da23b8659ec49391469bb592da12760077'
* commit '0a75d1da23b8659ec49391469bb592da12760077':
  options_table: refs option is not snow-only
  random_seed: Support using CryptGenRandom on windows
  doc: update the faq entry about custom I/O

Conflicts:
	doc/faq.texi
	libavcodec/options_table.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-10-12 14:15:33 +02:00
Michael Niedermayer 26474d1098 random_seed: fix digest size
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-10-11 18:28:21 +02:00
Michael Niedermayer 7fe5548531 random_seed: fix out of array read
Fixes CID733787
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-10-11 18:28:21 +02:00
Martin Storsjö 1093383d6c random_seed: Support using CryptGenRandom on windows
Signed-off-by: Martin Storsjö <martin@martin.st>
2012-10-11 18:49:34 +03:00
Derek Buitenhuis 9ab538e31f random_seed: Replace a VLA with a normal array
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-09-08 17:30:10 +02:00
Ronald S. Bultje a4d71eb5c3 random_seed: Only read /dev/*random if we have unistd.h
unistd.h is used for open/read/close, but if this header does not
exist, there's probably no use in trying to open /dev/*random
at all.

Signed-off-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-09-07 18:41:20 +02:00
Ronald S. Bultje f985113075 random_seed: Only read /dev/*random if we have unistd.h
unistd.h is used for open/read/close, but if this header does not
exist, there's probably no use in trying to open /dev/*random
at all.

Signed-off-by: Martin Storsjö <martin@martin.st>
2012-06-29 15:52:07 +03:00
Michael Niedermayer 66531c75d3 random_seed: rewrite generic code.
The new code is faster and reuses the previous state in case of
multiple calls. For testing the iterations are reduced and several
entropy sources are disabled.
Its based on SHA-1

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-06-11 12:19:11 +02:00
Michael Niedermayer 946de27d25 random_seed: add selftest
Reviewed-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2012-02-23 23:44:38 +01:00
Michael Niedermayer 707138593a Merge remote-tracking branch 'qatar/master'
* qatar/master:
  adpcmenc: cosmetics: pretty-printing
  ac3dec: cosmetics: pretty-printing
  yuv4mpeg: cosmetics: pretty-printing
  shorten: remove dead initialization
  roqvideodec: set AVFrame reference before reget_buffer.
  bmp: fix some 1bit samples.
  latmdec: add fate test for audio config change
  oma: PCM support
  oma: better format detection with small probe buffer
  oma: clearify ambiguous if condition
  wavpack: Properly clip samples during lossy decode
  Code clean-up for crc.c, lfg.c, log.c, random_see.d, rational.c and tree.c.
  Cleaned pixdesc.c file in libavutil
  zmbv.c: coding style clean-up.
  xan.c: coding style clean-up.
  mpegvideo.c: code cleanup - first 500 lines.

Conflicts:
	Changelog
	libavcodec/adpcmenc.c
	libavcodec/bmp.c
	libavcodec/zmbv.c
	libavutil/log.c
	libavutil/pixdesc.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-12-05 00:11:57 +01:00
Yordan Makariev 425b45d4b0 Code clean-up for crc.c, lfg.c, log.c, random_see.d, rational.c and tree.c.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
2011-12-03 15:13:48 -08:00
Michael Niedermayer 3c3daf4d19 Merge remote-tracking branch 'qatar/master'
* qatar/master:
  vf_libopencv: replace opencv/cxtypes.h #include by opencv/cxcore.h
  dsputil: remove disabled code
  tta: remove disabled code
  gxfenc: place variable declarations before statements
  x86: Use LOCAL_ALIGNED in mpegvideo_mmx_template
  random_seed: use proper #includes

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-07-18 16:43:46 +02:00
Mans Rullgard 172ee1da2b random_seed: use proper #includes
Use <> for system headers, add needed math.h, drop unnecessary avutil.h.

Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-07-17 20:47:39 +01:00
Michael Niedermayer 10d2ae8cf7 Merge remote branch 'qatar/master'
* qatar/master:
  Makefile: Include dependencies for test tools, too
  Remove a version check in av_log made unnecessary by the big bump.
  update last major version increase dates in APIchanges
  Reduce picture size for yadif.
  oggdec: use av_freep() instead of av_free()
  avio: Fix sanity checks in ffurl_read*
  libavformat: Free AVFormatContext->streams
  libavformat: Make protocols pass URLContext as log context where available
  asf: remove commented out code in asf_read_seek
not pulled:  libpostproc: Remove crufty code disabled by the big bump.
  Reflect 0.7_beta1 release in the Changelog
not pulled:  sws: remove disabled cruft.
  lavu: remove disabled ff_random_get_seed cruft.
  lavu: remove disabled sha1 cruft.

Conflicts:
	Changelog
	libavutil/sha1.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2011-04-21 03:37:05 +02:00
Anton Khirnov 975c273405 lavu: remove disabled ff_random_get_seed cruft. 2011-04-19 21:50:12 +02:00
Mans Rullgard 2912e87a6c Replace FFmpeg with Libav in licence headers
Signed-off-by: Mans Rullgard <mans@mansr.com>
2011-03-19 13:33:20 +00:00
Michael Niedermayer 6a522c49c2 Fix infinite loop with clock() returning (clock_t)-1.
Originally committed as revision 24116 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-08 18:13:31 +00:00
Michael Niedermayer b65c1ccfe1 Change i to unsigned in get_generic_seed().
This is clearer than comparing against an unsigned number to force an unsigned
comparison that we need.

Originally committed as revision 24114 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-08 17:49:39 +00:00
Michael Niedermayer c84d5aa74f get_generic_seed() for the cases without /dev/random and AV_READ_TIME
Originally committed as revision 24102 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-07 23:47:48 +00:00
Måns Rullgård 16bfbfd078 random_seed: simplify
Originally committed as revision 23932 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-01 11:43:30 +00:00
Måns Rullgård 9958096ea2 Reindent
Originally committed as revision 23931 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-01 11:40:54 +00:00
Måns Rullgård b7fa5c5abb random_seed: allow to block on /dev/random
If both /dev/random and /dev/urandom failed to return data, an
uninitialised value might be returned.  Since most systems have a
non-blocking /dev/urandom or have /dev/random with similar properties,
the chance of blocking is minimal, and the alternative of returning
non-random data is worse.

Originally committed as revision 23930 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-01 11:40:50 +00:00
Måns Rullgård 38e23c88db Make av_get_random_seed() non-blocking
Attempt to read from /dev/urandom and /dev/random with O_NONBLOCK set.
If neither succeeds, proceed with fallbacks.

Originally committed as revision 23903 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-06-30 10:38:04 +00:00
Martin Storsjö 576fb48e6d Make ff_random_get_seed public, rename to av_get_random_seed, export the header
Keep an old ff_ named function for binary compatibility until the
next major bump.

Originally committed as revision 23254 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-05-23 08:53:40 +00:00
Måns Rullgård 5de91783bf indent
Originally committed as revision 22451 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-11 02:32:14 +00:00
Måns Rullgård 49e9287878 random_seed: try other alternatives if reading /dev/random fails
Originally committed as revision 22450 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-11 02:32:11 +00:00
Baptiste Coudurier 48d58e592a add ff_random_get_seed to be used in conjunction with random functions
Originally committed as revision 17868 to svn://svn.ffmpeg.org/ffmpeg/trunk
2009-03-08 01:28:14 +00:00