On Mon, Nov 24, 2014 at 11:15:34AM +0100, Michael J Gruber wrote:
> > I wonder if we can have an option to sign all blob content of the tree
> > associated to a commit, and the content of parent commit(s). It's more
> > expensive than signing just commit/tag content. But it's also safer
> > without completely ditching SHA-1.
> >
>> This amounts to hashing the blob content with whatever hash you told
> your gpg to use (hopefully not sha1 ;) ) and signing that.
Right. You could also create a graph of SHA-256 (or whatever) object
hashes and sign that. I.e., create a parallel to git's trees using
SHA-256 and include a single:
object-256 ....
line in the tag header. That still involves re-hashing all of the data,
but it would at least be possible to cache (i.e., a mapping of SHA-1 to
SHA-256 hashes). Of course one way to keep that caching layer up to date
would be to just calculate the SHA-256 along with the SHA-1 whenever we
create an object. And then you can sprinkle SHA-256 links in other
places, too, like commit objects.
And now you are halfway down the road to a combined SHA-1/SHA-256 git.
:)
The tricky thing is fitting the extra hash into the tree objects. And of
course the rules for actually generating and/or sending extra objects.
-Peff
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