diff options
Diffstat (limited to 'PrevActivity.hs')
| -rw-r--r-- | PrevActivity.hs | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/PrevActivity.hs b/PrevActivity.hs index 32e647d..7c5e808 100644 --- a/PrevActivity.hs +++ b/PrevActivity.hs @@ -5,11 +5,11 @@ import Crypto import Control.Concurrent.STM --- | Remove the prevActivity from a message. Doing this before sending +-- | Remove the hashes from a message. Doing this before sending -- it over the wire saves transmitting that data, without weakening -- security at all. -removePrevActivityHash :: AnyMessage -> AnyMessage -removePrevActivityHash msg = case msg of +removeHashes :: AnyMessage -> MissingHashes AnyMessage +removeHashes msg = MissingHashes $ case msg of User (ActivityMessage a) -> User (go a) Developer (ActivityMessage a) -> Developer (go a) _ -> msg @@ -18,15 +18,12 @@ removePrevActivityHash msg = case msg of type RecentActivity = STM (SigVerifier, [Hash]) -noRecentActivity :: RecentActivity -noRecentActivity = return (mempty, []) - --- | Restore the prevActivity to a message received without one. +-- | Restore the hashes to a message received. -- This needs a RecentActivity cache, and it tries hashes from that cache --- as the prevActivity until it finds one that makes the message's --- signature verify. -restorePrevActivityHash :: RecentActivity -> AnyMessage -> STM AnyMessage -restorePrevActivityHash ra msg = case msg of +-- to find the one that was used when the message was sent, at which +-- point the message's signature will verify. +restoreHashes :: RecentActivity -> MissingHashes AnyMessage -> STM AnyMessage +restoreHashes ra (MissingHashes msg) = case msg of User (ActivityMessage act) -> User . ActivityMessage <$> (go act =<< ra) Developer (ActivityMessage act) -> |