1 files changed, 0 insertions, 174 deletions
diff --git a/src/Channel.hs b/src/Channel.hs
deleted file mode 100644
index 167c1ba..0000000
--- a/src/Channel.hs
+++ /dev/null
@@ -1,174 +0,0 @@
-module Channel (
-    Channel,
-    ChannelRequest, ChannelRequestData(..),
-    ChannelAccept, ChannelAcceptData(..),
-
-    createChannelRequest,
-    acceptChannelRequest,
-    acceptedChannel,
-
-    channelEncrypt,
-    channelDecrypt,
-) where
-
-import Control.Concurrent.MVar
-import Control.Monad
-import Control.Monad.Except
-
-import Crypto.Cipher.ChaChaPoly1305
-import Crypto.Error
-
-import Data.Binary
-import Data.ByteArray (ByteArray, Bytes, ScrubbedBytes, convert)
-import Data.ByteArray qualified as BA
-import Data.ByteString.Lazy qualified as BL
-import Data.List
-
-import Identity
-import PubKey
-import Storage
-
-data Channel = Channel
-    { chPeers :: [Stored (Signed IdentityData)]
-    , chKey :: ScrubbedBytes
-    , chNonceFixedOur :: Bytes
-    , chNonceFixedPeer :: Bytes
-    , chCounterNextOut :: MVar Word64
-    , chCounterNextIn :: MVar Word64
-    }
-
-type ChannelRequest = Signed ChannelRequestData
-
-data ChannelRequestData = ChannelRequest
-    { crPeers :: [Stored (Signed IdentityData)]
-    , crKey :: Stored PublicKexKey
-    }
-    deriving (Show)
-
-type ChannelAccept = Signed ChannelAcceptData
-
-data ChannelAcceptData = ChannelAccept
-    { caRequest :: Stored ChannelRequest
-    , caKey :: Stored PublicKexKey
-    }
-
-
-instance Storable ChannelRequestData where
-    store' cr = storeRec $ do
-        mapM_ (storeRef "peer") $ crPeers cr
-        storeRef "key" $ crKey cr
-
-    load' = loadRec $ do
-        ChannelRequest
-            <$> loadRefs "peer"
-            <*> loadRef "key"
-
-instance Storable ChannelAcceptData where
-    store' ca = storeRec $ do
-        storeRef "req" $ caRequest ca
-        storeRef "key" $ caKey ca
-
-    load' = loadRec $ do
-        ChannelAccept
-            <$> loadRef "req"
-            <*> loadRef "key"
-
-
-keySize :: Int
-keySize = 32
-
-createChannelRequest :: (MonadStorage m, MonadIO m, MonadError String m) => UnifiedIdentity -> UnifiedIdentity -> m (Stored ChannelRequest)
-createChannelRequest self peer = do
-    (_, xpublic) <- liftIO . generateKeys =<< getStorage
-    skey <- loadKey $ idKeyMessage self
-    mstore =<< sign skey =<< mstore ChannelRequest { crPeers = sort [idData self, idData peer], crKey = xpublic }
-
-acceptChannelRequest :: (MonadStorage m, MonadIO m, MonadError String m) => UnifiedIdentity -> UnifiedIdentity -> Stored ChannelRequest -> m (Stored ChannelAccept, Channel)
-acceptChannelRequest self peer req = do
-    case sequence $ map validateIdentity $ crPeers $ fromStored $ signedData $ fromStored req of
-        Nothing -> throwError $ "invalid peers in channel request"
-        Just peers -> do
-            when (not $ any (self `sameIdentity`) peers) $
-                throwError $ "self identity missing in channel request peers"
-            when (not $ any (peer `sameIdentity`) peers) $
-                throwError $ "peer identity missing in channel request peers"
-    when (idKeyMessage peer `notElem` (map (sigKey . fromStored) $ signedSignature $ fromStored req)) $
-        throwError $ "channel requent not signed by peer"
-
-    (xsecret, xpublic) <- liftIO . generateKeys =<< getStorage
-    skey <- loadKey $ idKeyMessage self
-    acc <- mstore =<< sign skey =<< mstore ChannelAccept { caRequest = req, caKey = xpublic }
-    liftIO $ do
-        let chPeers = crPeers $ fromStored $ signedData $ fromStored req
-            chKey = BA.take keySize $ dhSecret xsecret $
-                fromStored $ crKey $ fromStored $ signedData $ fromStored req
-            chNonceFixedOur  = BA.pack [ 2, 0, 0, 0 ]
-            chNonceFixedPeer = BA.pack [ 1, 0, 0, 0 ]
-        chCounterNextOut <- newMVar 0
-        chCounterNextIn <- newMVar 0
-
-        return (acc, Channel {..})
-
-acceptedChannel :: (MonadIO m, MonadError String m) => UnifiedIdentity -> UnifiedIdentity -> Stored ChannelAccept -> m Channel
-acceptedChannel self peer acc = do
-    let req = caRequest $ fromStored $ signedData $ fromStored acc
-    case sequence $ map validateIdentity $ crPeers $ fromStored $ signedData $ fromStored req of
-        Nothing -> throwError $ "invalid peers in channel accept"
-        Just peers -> do
-            when (not $ any (self `sameIdentity`) peers) $
-                throwError $ "self identity missing in channel accept peers"
-            when (not $ any (peer `sameIdentity`) peers) $
-                throwError $ "peer identity missing in channel accept peers"
-    when (idKeyMessage peer `notElem` (map (sigKey . fromStored) $ signedSignature $ fromStored acc)) $
-        throwError $ "channel accept not signed by peer"
-    when (idKeyMessage self `notElem` (map (sigKey . fromStored) $ signedSignature $ fromStored req)) $
-        throwError $ "original channel request not signed by us"
-
-    xsecret <- loadKey $ crKey $ fromStored $ signedData $ fromStored req
-    let chPeers = crPeers $ fromStored $ signedData $ fromStored req
-        chKey = BA.take keySize $ dhSecret xsecret $
-            fromStored $ caKey $ fromStored $ signedData $ fromStored acc
-        chNonceFixedOur  = BA.pack [ 1, 0, 0, 0 ]
-        chNonceFixedPeer = BA.pack [ 2, 0, 0, 0 ]
-    chCounterNextOut <- liftIO $ newMVar 0
-    chCounterNextIn <- liftIO $ newMVar 0
-
-    return Channel {..}
-
-
-channelEncrypt :: (ByteArray ba, MonadIO m, MonadError String m) => Channel -> ba -> m (ba, Word64)
-channelEncrypt Channel {..} plain = do
-    count <- liftIO $ modifyMVar chCounterNextOut $ \c -> return (c + 1, c)
-    let cbytes = convert $ BL.toStrict $ encode count
-        nonce = nonce8 chNonceFixedOur cbytes
-    state <- case initialize chKey =<< nonce of
-        CryptoPassed state -> return state
-        CryptoFailed err -> throwError $ "failed to init chacha-poly1305 cipher: " <> show err
-
-    let (ctext, state') = encrypt plain state
-        tag = finalize state'
-    return (BA.concat [ convert $ BA.drop 7 cbytes, ctext, convert tag ], count)
-
-channelDecrypt :: (ByteArray ba, MonadIO m, MonadError String m) => Channel -> ba -> m (ba, Word64)
-channelDecrypt Channel {..} body = do
-    when (BA.length body < 17) $ do
-        throwError $ "invalid encrypted data length"
-
-    expectedCount <- liftIO $ readMVar chCounterNextIn
-    let countByte = body `BA.index` 0
-        body' = BA.dropView body 1
-        guessedCount = expectedCount - 128 + fromIntegral (countByte - fromIntegral expectedCount + 128 :: Word8)
-        nonce = nonce8 chNonceFixedPeer $ convert $ BL.toStrict $ encode guessedCount
-        blen = BA.length body' - 16
-        ctext = BA.takeView body' blen
-        tag = BA.dropView body' blen
-    state <- case initialize chKey =<< nonce of
-        CryptoPassed state -> return state
-        CryptoFailed err -> throwError $ "failed to init chacha-poly1305 cipher: " <> show err
-
-    let (plain, state') = decrypt (convert ctext) state
-    when (not $ tag `BA.constEq` finalize state') $ do
-        throwError $ "tag validation falied"
-
-    liftIO $ modifyMVar_ chCounterNextIn $ return . max (guessedCount + 1)
-    return (plain, guessedCount)