Added support for SHA3 hashed keys (in 8 varieties), when git-annex is built using the cryptonite library.

While cryptohash has SHA3 support, it has not been updated for the final
version of the spec. Note that cryptonite has not been ported to all arches
that cryptohash builds on yet.

Utility/WebApp.hs

@@ -185,7 +185,7 @@ fromAuthToken = TE.decodeLatin1 . toBytes
 fromAuthToken = id
 #endif
 
-{- Generates a random sha512 string, encapsulated in a SecureMem,
+{- Generates a random sha2_512 string, encapsulated in a SecureMem,
  - suitable to be used for an authentication secret. -}
 genAuthToken :: IO AuthToken
 genAuthToken = do
@@ -193,7 +193,7 @@ genAuthToken = do
 	return $
 		case genBytes 512 g of
 			Left e -> error $ "failed to generate auth token: " ++ show e
-			Right (s, _) -> toAuthToken $ T.pack $ show $ sha512 $ L.fromChunks [s]
+			Right (s, _) -> toAuthToken $ T.pack $ show $ sha2_512 $ L.fromChunks [s]
 
 {- A Yesod isAuthorized method, which checks the auth cgi parameter
  - against a token extracted from the Yesod application.