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{-# LANGUAGE OverloadedStrings, RankNTypes #-}
module Crypto where
import Val
import Hash
import Types
import qualified Crypto.PubKey.Ed25519 as Ed25519
import Crypto.Error
import Crypto.Random.Entropy
import Data.ByteArray (convert)
import Data.ByteString
dummySignature :: Signature
dummySignature = OtherSignature (Val mempty)
class Signed t where
getSignature :: t -> Signature
hashExceptSignature :: t -> Hash
mkSigned :: MySessionKey -> (Signature -> t) -> t
mkSigned sk mk =
let tmp = mk dummySignature
in mk (sign sk tmp)
instance Hashable a => Signed (Activity a) where
getSignature = activitySignature
hashExceptSignature (Activity a mp _s) = hash $
Tagged "Activity" [hash a, hash mp]
instance Signed Control where
getSignature = controlSignature
hashExceptSignature (Control a _s) = hash $
Tagged "Control" a
instance Hashable t => Signed (Message t) where
getSignature (ActivityMessage a) = getSignature a
getSignature (ControlMessage c) = getSignature c
hashExceptSignature (ActivityMessage a) = hashExceptSignature a
hashExceptSignature (ControlMessage c) = hashExceptSignature c
sign :: Signed v => MySessionKey -> v -> Signature
sign (MySessionKey sk pk) v = Ed25519Signature $ Val $ convert $
Ed25519.sign sk pk (toSign v)
toSign :: Signed v => v -> ByteString
toSign = val . hashValue . hashExceptSignature
-- | Verifiy the signature of a Signed value.
verifySigned :: Signed v => SigVerifier -> v -> Bool
verifySigned (SigVerifier verifier) v =
case getSignature v of
Ed25519Signature (Val s) ->
case Ed25519.signature s of
CryptoPassed sig -> verifier (toSign v) sig
CryptoFailed _ -> False
OtherSignature _ -> False
data SigVerifier = SigVerifier (ByteString -> Ed25519.Signature -> Bool)
mkSigVerifier :: PublicKey -> SigVerifier
mkSigVerifier (PublicKey (Val pk) _) =
case Ed25519.publicKey pk of
CryptoPassed pk' -> SigVerifier (Ed25519.verify pk')
CryptoFailed _ -> mempty
instance Monoid SigVerifier where
mempty = SigVerifier $ \_b _s -> False
mappend (SigVerifier a) (SigVerifier b) =
SigVerifier $ \d s -> b d s || a d s
data MySessionKey = MySessionKey Ed25519.SecretKey Ed25519.PublicKey
-- TODO add gpg signature when available
myPublicKey :: MySessionKey -> IO PublicKey
myPublicKey (MySessionKey _ pk) = do
let gpgsig = Nothing
return $ PublicKey (Val (convert pk)) gpgsig
genMySessionKey :: IO MySessionKey
genMySessionKey = do
-- Crypto.Random.Entropy may use rdrand, or /dev/random.
-- Even if you don't trust rdrand to be free of backdoors,
-- it seems safe enough to use it for a session key that
-- is only used for signing, not encryption.
rand32 <- getEntropy 32 :: IO ByteString
sk <- throwCryptoErrorIO $ Ed25519.secretKey rand32
return $ MySessionKey sk (Ed25519.toPublic sk)
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