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From: "brian m. carlson" <sandals@crustytoothpaste.net>
To: Duy Nguyen <pclouds@gmail.com>
Cc: Joey Hess <id@joeyh.name>, Git Mailing List <git@vger.kernel.org>
Subject: Re: SHA1 collisions found
Date: Sat, 25 Feb 2017 19:04:10 +0000	[thread overview]
Message-ID: <20170225190410.anvb7ll7tlhwgm3t@genre.crustytoothpaste.net> (raw)
In-Reply-To: <CACsJy8AtQG8YXQ+YfSFifUxqtd==THj5weJK5jooyiRN0yamiQ@mail.gmail.com>

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On Fri, Feb 24, 2017 at 04:42:38PM +0700, Duy Nguyen wrote:
> On Thu, Feb 23, 2017 at 11:43 PM, Joey Hess <id@joeyh.name> wrote:
> > IIRC someone has been working on parameterizing git's SHA1 assumptions
> > so a repository could eventually use a more secure hash. How far has
> > that gotten? There are still many "40" constants in git.git HEAD.
> 
> Michael asked Brian (that "someone") the other day and he replied [1]
> 
> >> I'm curious; what fraction of the overall convert-to-object_id campaign
> >> do you estimate is done so far? Are you getting close to the promised
> >> land yet?
> >
> > So I think that the current scope left is best estimated by the
> > following command:
> >
> >   git grep -P 'unsigned char\s+(\*|.*20)' | grep -v '^Documentation'
> >
> > So there are approximately 1200 call sites left, which is quite a bit of
> > work.  I estimate between the work I've done and other people's
> > refactoring work (such as the refs backend refactor), we're about 40%
> > done.

As a note, I've been working on this pretty much nonstop since the
collision announcement was made.  After another 27 commits, I've got it
down from 1244 to 1119.

I plan to send another series out sometime after the existing series has
hit next.  People who are interested can follow the object-id-part*
branches at https://github.com/bk2204/git.
-- 
brian m. carlson / brian with sandals: Houston, Texas, US
+1 832 623 2791 | https://www.crustytoothpaste.net/~bmc | My opinion only
OpenPGP: https://keybase.io/bk2204

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  reply	other threads:[~2017-02-25 19:12 UTC|newest]

Thread overview: 136+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-23 16:43 SHA1 collisions found Joey Hess
2017-02-23 17:00 ` David Lang
2017-02-23 17:02 ` Junio C Hamano
2017-02-23 17:12   ` David Lang
2017-02-23 20:49     ` Jakub Narębski
2017-02-23 20:57       ` Jeff King
2017-02-23 17:18   ` Junio C Hamano
2017-02-23 17:35   ` Joey Hess
2017-02-23 17:52     ` Linus Torvalds
2017-02-23 18:21       ` Joey Hess
2017-02-23 18:31         ` Joey Hess
2017-02-23 19:13           ` Morten Welinder
2017-02-24 15:52             ` Geert Uytterhoeven
2017-02-23 18:40         ` Linus Torvalds
2017-02-23 18:46           ` Jeff King
2017-02-23 19:09             ` Linus Torvalds
2017-02-23 19:32               ` Jeff King
2017-02-23 19:47                 ` Linus Torvalds
2017-02-23 19:57                   ` Jeff King
     [not found]                     ` <alpine.LFD.2.20.1702231428540.30435@i7.lan>
2017-02-23 22:43                       ` Jeff King
2017-02-23 22:50                         ` Linus Torvalds
2017-02-23 23:05                         ` Jeff King
2017-02-23 23:05                           ` [PATCH 1/3] add collision-detecting sha1 implementation Jeff King
2017-02-23 23:15                             ` Stefan Beller
2017-02-24  0:01                               ` Jeff King
2017-02-24  0:12                                 ` Linus Torvalds
2017-02-24  0:16                                   ` Jeff King
2017-02-23 23:05                           ` [PATCH 2/3] sha1dc: adjust header includes for git Jeff King
2017-02-23 23:06                           ` [PATCH 3/3] Makefile: add USE_SHA1DC knob Jeff King
2017-02-24 18:36                             ` HW42
2017-02-24 18:57                               ` Jeff King
2017-02-23 23:14                           ` SHA1 collisions found Linus Torvalds
2017-02-28 18:41                           ` Junio C Hamano
2017-02-28 19:07                             ` Junio C Hamano
2017-02-28 19:20                               ` Jeff King
2017-03-01  8:57                                 ` Dan Shumow
2017-02-28 19:34                               ` Linus Torvalds
2017-02-28 19:52                                 ` Shawn Pearce
2017-02-28 22:56                                   ` Linus Torvalds
2017-02-28 21:22                                 ` Dan Shumow
2017-02-28 22:50                                   ` Marc Stevens
2017-02-28 23:11                                     ` Linus Torvalds
2017-03-01 19:05                                       ` Jeff King
2017-02-23 20:47               ` Øyvind A. Holm
2017-02-23 20:46             ` Joey Hess
2017-02-23 18:42         ` Jeff King
2017-02-23 17:52     ` David Lang
2017-02-23 19:20   ` David Lang
2017-02-23 17:19 ` Linus Torvalds
2017-02-23 17:29   ` Linus Torvalds
2017-02-23 18:10   ` Joey Hess
2017-02-23 18:29     ` Linus Torvalds
2017-02-23 18:38     ` Junio C Hamano
2017-02-24  9:42 ` Duy Nguyen
2017-02-25 19:04   ` brian m. carlson [this message]
2017-02-27 13:29     ` René Scharfe
2017-02-28 13:25       ` brian m. carlson
2017-02-24 15:13 ` Ian Jackson
2017-02-24 17:04   ` ankostis
2017-02-24 17:23   ` Jason Cooper
2017-02-25 23:22     ` ankostis
2017-02-24 17:32   ` Junio C Hamano
2017-02-24 17:45     ` David Lang
2017-02-24 18:14       ` Junio C Hamano
2017-02-24 18:58         ` Stefan Beller
2017-02-24 19:20           ` Junio C Hamano
2017-02-24 20:05             ` ankostis
2017-02-24 20:32               ` Junio C Hamano
2017-02-25  0:31                 ` ankostis
2017-02-26  0:16                   ` Jason Cooper
2017-02-26 17:38                     ` brian m. carlson
2017-02-26 19:11                       ` Linus Torvalds
2017-02-26 21:38                         ` Ævar Arnfjörð Bjarmason
2017-02-26 21:52                           ` Jeff King
2017-02-27 13:00                             ` Transition plan for git to move to a new hash function Ian Jackson
2017-02-27 14:37                               ` Why BLAKE2? Markus Trippelsdorf
2017-02-27 15:42                                 ` Ian Jackson
2017-02-27 19:26                               ` Transition plan for git to move to a new hash function Tony Finch
2017-02-28 21:47                               ` brian m. carlson
2017-03-02 18:13                                 ` Ian Jackson
2017-03-04 22:49                                   ` brian m. carlson
2017-03-05 13:45                                     ` Ian Jackson
2017-03-05 23:45                                       ` brian m. carlson
2017-02-24 20:05             ` SHA1 collisions found Junio C Hamano
2017-02-24 20:33           ` Philip Oakley
2017-02-24 23:39     ` Jeff King
2017-02-25  0:39       ` Linus Torvalds
2017-02-25  0:54         ` Linus Torvalds
2017-02-25  1:16         ` Jeff King
2017-02-26 18:55           ` Junio C Hamano
2017-02-25  6:10         ` Junio C Hamano
2017-02-26  1:13           ` Jason Cooper
2017-02-26  5:18             ` Jeff King
2017-02-26 18:30               ` brian m. carlson
2017-03-02 21:46               ` Brandon Williams
2017-03-03 11:13                 ` Jeff King
2017-03-03 14:54                   ` Ian Jackson
2017-03-03 22:18                     ` Jeff King
2017-03-02 19:55         ` Linus Torvalds
2017-03-02 20:43           ` Junio C Hamano
2017-03-02 21:21             ` Linus Torvalds
2017-03-02 21:54               ` Joey Hess
2017-03-02 22:27                 ` Linus Torvalds
2017-03-03  1:50                   ` Mike Hommey
2017-03-03  2:19                     ` Linus Torvalds
2017-03-03 11:04           ` Jeff King
2017-03-03 21:47           ` Stefan Beller
2017-02-25  1:00       ` David Lang
2017-02-25  1:15         ` Stefan Beller
2017-02-25  1:21         ` Jeff King
2017-02-25  1:39           ` David Lang
2017-02-25  1:47             ` Jeff King
2017-02-25  1:56               ` David Lang
2017-02-25  2:28             ` Jacob Keller
2017-02-25  2:26           ` Jacob Keller
2017-02-25  5:39             ` grarpamp
2017-02-24 23:43     ` Ian Jackson
2017-02-25  0:06       ` Ian Jackson
2017-02-25 18:50     ` brian m. carlson
2017-02-25 19:26       ` Jeff King
2017-02-25 22:09         ` Mike Hommey
2017-02-26 17:38           ` brian m. carlson
2017-02-24 22:47 ` Jakub Narębski
2017-02-24 22:53   ` Santiago Torres
2017-02-24 23:05     ` Jakub Narębski
2017-02-24 23:24       ` Øyvind A. Holm
2017-02-24 23:06   ` Jeff King
2017-02-24 23:35     ` Jakub Narębski
2017-02-25 22:35     ` Lars Schneider
2017-02-26  0:46       ` Jeff King
2017-02-26 18:22         ` Junio C Hamano
2017-02-26 18:57     ` Thomas Braun
2017-02-26 21:30       ` Jeff King
2017-02-27  9:57         ` Geert Uytterhoeven
2017-02-27 10:43           ` Jeff King
2017-02-27 12:39             ` Morten Welinder

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