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Added SKEIN256 and SKEIN512 backends

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SHA3 is still waiting for final standardization.
Although this is looking less likely given
https://www.cdt.org/blogs/joseph-lorenzo-hall/2409-nist-sha-3

In the meantime, cryptohash implements skein, and it's used by some of the
haskell ecosystem (for yesod sessions, IIRC), so this implementation is
likely to continue working. Also, I've talked with the cryprohash author
and he's a reasonable guy.

It makes sense to have an alternate high security hash, in case some
horrible attack is found against SHA2 tomorrow, or in case SHA3 comes out
and worst fears are realized.

I'd also like to support using skein for HMAC. But no hurry there and
a new version of cryptohash has much nicer HMAC code, so I will probably
wait until I can use that version.
This commit is contained in:
Joey Hess 2013-10-01 20:34:06 -04:00
parent d9355d8064
commit a05b763b01
5 changed files with 89 additions and 68 deletions
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doc/backends.mdwn
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@ -21,6 +21,8 @@ can use different ones for different files.
but are not concerned about security.
* `SHA384`, `SHA384E`, `SHA224`, `SHA224E` -- Hashes for people who like
unusual sizes.
* `SKEIN512`, `SKEIN256` -- [Skein hash](http://en.wikipedia.org/wiki/Skein_hash),
a well-regarded SHA3 hash competition finalist.
The `annex.backends` git-config setting can be used to list the backends
git-annex should use. The first one listed will be used by default when