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RE: Check SHA vs Content (was: RE: svn commit: r1759233 - /subversion/trunk/subversion/libsvn_wc/questions.c)

From: Markus Schaber <m.schaber_at_codesys.com>
Date: Tue, 4 Apr 2017 13:17:28 +0000


> -----Original Message-----
> From: Stefan Sperling [mailto:stsp_at_elego.de]
> Sent: Tuesday, April 04, 2017 12:19 PM
> To: Daniel Shahaf
> Cc: dev_at_subversion.apache.org
> Subject: Re: Check SHA vs Content (was: RE: svn commit: r1759233 -
> /subversion/trunk/subversion/libsvn_wc/questions.c)
> On Tue, Apr 04, 2017 at 10:00:31AM +0000, Daniel Shahaf wrote:
> > Note that we can still do what rep-cache now does: treat equality of
> > checksums as a sensitive but not specific test for bit-for-bit
> > equality; that is: checksum the file, and if the resulting value is
> > equal to the stored value, do a full-text comparison too.
> Yeah, that sounds OK.

INHO, it's also still sensible to use SHA1 (or even MD5) as a "technical" checksum to protect against problems like transmission errors, storage failure, random bit flips or accidental changing of pristine copies.

It's just that we must not use SHA1 as a sole means of identifying content or content identity.

Best regards

Markus Schaber

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Received on 2017-04-04 15:17:43 CEST

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