Re: Gitorious should use CRC128 / 256 / 512 instead of SHA-1

From: Hans Petter Selasky <hps@selasky.org>
Date: Jan 13, 2023, 16:35 UTC
Message-ID: <038b4ea4-2a10-9b5a-14e4-e987a68e93b0@selasky.org>
In-Reply-To: <20230113162721.qwl2asjo542cxe3c@meerkat.local>

On 1/13/23 17:27, Konstantin Ryabitsev wrote:

Show 6 quoted lines

> Not to discourage you, but you seem to be making statements without a good
> understanding of how git works. If there is a history rewrite (even one that
> for some reason goes back millions of commits) all hash calculations will
> happen exactly once -- on the system of the person who's rewriting the
> history. After they push it, it's just a bunch of objects that everyone else
> merely downloads.

If you used CRC, you would not need that, because CRC calculations are "concatenatable", while SHA-1's are not. CRC would just need the first and the last hash, and then you would apply the "difference".

--HPS