module Codec.Encryption.OpenPGP.Expirations (
isTKTimeValid
, getKeyExpirationTimesFromSignature
) where
import Control.Lens ((&), (^.), _1)
import Data.Time.Clock (UTCTime)
import Data.Time.Clock.POSIX (posixSecondsToUTCTime)
import Codec.Encryption.OpenPGP.Types
import Codec.Encryption.OpenPGP.Ontology (isKET)
isTKTimeValid :: UTCTime -> TK -> Bool
isTKTimeValid ct key = ct >= keyCreationTime && ct < keyExpirationTime
where
keyCreationTime = key^.tkKey._1.timestamp & posixSecondsToUTCTime . realToFrac
keyExpirationTime = posixSecondsToUTCTime . realToFrac . ((key^.tkKey._1.timestamp & unThirtyTwoBitTimeStamp) +) . unThirtyTwoBitDuration . newest . concatMap getKeyExpirationTimesFromSignature $ (concatMap snd (key^.tkUIDs) ++ concatMap snd (key^.tkUAts))
newest [] = maxBound
newest xs = maximum xs
getKeyExpirationTimesFromSignature :: SignaturePayload -> [ThirtyTwoBitDuration]
getKeyExpirationTimesFromSignature (SigV4 _ _ _ xs _ _ _) = map (\(SigSubPacket _ (KeyExpirationTime x)) -> x) $ filter isKET xs