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module PubKey (
PublicKey, SecretKey,
Signature(sigKey), Signed, signedData, signedSignature,
generateKeys,
sign, signAdd,
) where
import Control.Monad
import Control.Monad.Except
import Crypto.Error
import qualified Crypto.PubKey.Ed25519 as ED
import Data.ByteString (ByteString)
import qualified Data.Text as T
import Storage
data PublicKey = PublicKey ED.PublicKey
deriving (Show)
data SecretKey = SecretKey ED.SecretKey (Stored PublicKey)
data Signature = Signature
{ sigKey :: Stored PublicKey
, sigSignature :: ED.Signature
}
deriving (Show)
data Signed a = Signed
{ signedData_ :: Stored a
, signedSignature_ :: [Stored Signature]
}
deriving (Show)
signedData :: Signed a -> Stored a
signedData = signedData_
signedSignature :: Signed a -> [Stored Signature]
signedSignature = signedSignature_
instance Storable PublicKey where
store' (PublicKey pk) = storeRec $ do
storeText "type" $ T.pack "ed25519"
storeBinary "pubkey" pk
load' = loadRec $ do
ktype <- loadText "type"
guard $ ktype == "ed25519"
maybe (throwError "Public key decoding failed") (return . PublicKey) .
maybeCryptoError . (ED.publicKey :: ByteString -> CryptoFailable ED.PublicKey) =<<
loadBinary "pubkey"
instance Storable Signature where
store' sig = storeRec $ do
storeRef "key" $ sigKey sig
storeBinary "sig" $ sigSignature sig
load' = loadRec $ Signature
<$> loadRef "key"
<*> loadSignature "sig"
where loadSignature = maybe (throwError "Signature decoding failed") return .
maybeCryptoError . (ED.signature :: ByteString -> CryptoFailable ED.Signature) <=< loadBinary
instance Storable a => Storable (Signed a) where
store' sig = storeRec $ do
storeRef "data" $ signedData sig
mapM_ (storeRef "sig") $ signedSignature sig
load' = loadRec $ do
sdata <- loadRef "data"
sigs <- loadRefs "sig"
forM_ sigs $ \sig -> do
let PublicKey pubkey = fromStored $ sigKey $ fromStored sig
when (not $ ED.verify pubkey (storedRef sdata) $ sigSignature $ fromStored sig) $
throwError "signature verification failed"
return $ Signed sdata sigs
generateKeys :: Storage -> IO (SecretKey, Stored PublicKey)
generateKeys st = do
secret <- ED.generateSecretKey
public <- wrappedStore st $ PublicKey $ ED.toPublic secret
return (SecretKey secret public, public)
sign :: SecretKey -> Stored a -> IO (Signed a)
sign secret val = signAdd secret $ Signed val []
signAdd :: SecretKey -> Signed a -> IO (Signed a)
signAdd (SecretKey secret spublic) (Signed val sigs) = do
let PublicKey public = fromStored spublic
sig = ED.sign secret public $ storedRef val
ssig <- wrappedStore (storedStorage val) $ Signature spublic sig
return $ Signed val (ssig : sigs)
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