License	BSD3
Safe Haskell	None
Language	Haskell2010

Data.CryptoID.Poly

Description

Given a value of an arbitrary serializable type (like Int) we perform serialization and compute a cryptographic hash of the associated namespace (carried as a phantom type of kind Symbol). The serializedpayload is then encrypted using the symmetric cipher in CBC mode using the hashed namespace as an initialization vector (IV).

Since the serialized payload is padded such that its length is an integer multiple of the block size we can detect namespace mismatches by checking that all bytes expected to have been inserted during padding are nil.

The probability of detecting a namespace mismatch is thus (1 - 2^{l text{mod} 64}) where \(l\) is the length of the serialized payload in bits.

Synopsis

Documentation

newtype CryptoID namespace a :: Symbol -> * -> * #

Constructors

CryptoID
Fields ciphertext :: a

Instances

Eq a => Eq (CryptoID namespace a)
Methods (==) :: CryptoID namespace a -> CryptoID namespace a -> Bool # (/=) :: CryptoID namespace a -> CryptoID namespace a -> Bool #
(Data a, KnownSymbol namespace) => Data (CryptoID namespace a)
Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> CryptoID namespace a -> c (CryptoID namespace a) # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (CryptoID namespace a) # toConstr :: CryptoID namespace a -> Constr # dataTypeOf :: CryptoID namespace a -> DataType # dataCast1 :: Typeable (* -> ) t => (forall d. Data d => c (t d)) -> Maybe (c (CryptoID namespace a)) # dataCast2 :: Typeable ( -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (CryptoID namespace a)) # gmapT :: (forall b. Data b => b -> b) -> CryptoID namespace a -> CryptoID namespace a # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> CryptoID namespace a -> r # gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> CryptoID namespace a -> r # gmapQ :: (forall d. Data d => d -> u) -> CryptoID namespace a -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> CryptoID namespace a -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> CryptoID namespace a -> m (CryptoID namespace a) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> CryptoID namespace a -> m (CryptoID namespace a) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> CryptoID namespace a -> m (CryptoID namespace a) #
Ord a => Ord (CryptoID namespace a)
Methods compare :: CryptoID namespace a -> CryptoID namespace a -> Ordering # (<) :: CryptoID namespace a -> CryptoID namespace a -> Bool # (<=) :: CryptoID namespace a -> CryptoID namespace a -> Bool # (>) :: CryptoID namespace a -> CryptoID namespace a -> Bool # (>=) :: CryptoID namespace a -> CryptoID namespace a -> Bool # max :: CryptoID namespace a -> CryptoID namespace a -> CryptoID namespace a # min :: CryptoID namespace a -> CryptoID namespace a -> CryptoID namespace a #
Read a => Read (CryptoID namespace a)
Methods readsPrec :: Int -> ReadS (CryptoID namespace a) # readList :: ReadS [CryptoID namespace a] # readPrec :: ReadPrec (CryptoID namespace a) # readListPrec :: ReadPrec [CryptoID namespace a] #
Show a => Show (CryptoID namespace a)
Methods showsPrec :: Int -> CryptoID namespace a -> ShowS # show :: CryptoID namespace a -> String # showList :: [CryptoID namespace a] -> ShowS #
Generic (CryptoID namespace a)
Associated Types type Rep (CryptoID namespace a) :: * -> * # Methods from :: CryptoID namespace a -> Rep (CryptoID namespace a) x # to :: Rep (CryptoID namespace a) x -> CryptoID namespace a #
Storable a => Storable (CryptoID namespace a)
Methods sizeOf :: CryptoID namespace a -> Int # alignment :: CryptoID namespace a -> Int # peekElemOff :: Ptr (CryptoID namespace a) -> Int -> IO (CryptoID namespace a) # pokeElemOff :: Ptr (CryptoID namespace a) -> Int -> CryptoID namespace a -> IO () # peekByteOff :: Ptr b -> Int -> IO (CryptoID namespace a) # pokeByteOff :: Ptr b -> Int -> CryptoID namespace a -> IO () # peek :: Ptr (CryptoID namespace a) -> IO (CryptoID namespace a) # poke :: Ptr (CryptoID namespace a) -> CryptoID namespace a -> IO () #
Binary a => Binary (CryptoID namespace a)
Methods put :: CryptoID namespace a -> Put # get :: Get (CryptoID namespace a) # putList :: [CryptoID namespace a] -> Put #
ToHttpApiData a => ToHttpApiData (CryptoID namespace a)
Methods toUrlPiece :: CryptoID namespace a -> Text # toEncodedUrlPiece :: CryptoID namespace a -> Builder # toHeader :: CryptoID namespace a -> ByteString # toQueryParam :: CryptoID namespace a -> Text #
FromHttpApiData a => FromHttpApiData (CryptoID namespace a)
Methods parseUrlPiece :: Text -> Either Text (CryptoID namespace a) # parseHeader :: ByteString -> Either Text (CryptoID namespace a) # parseQueryParam :: Text -> Either Text (CryptoID namespace a) #
PathPiece a => PathPiece (CryptoID namespace a)
Methods fromPathPiece :: Text -> Maybe (CryptoID namespace a) # toPathPiece :: CryptoID namespace a -> Text #
type Rep (CryptoID namespace a)
type Rep (CryptoID namespace a) = D1 (MetaData "CryptoID" "Data.CryptoID" "cryptoids-types-0.0.0-LE8g4K8uXWZ2rFXomw7gsy" True) (C1 (MetaCons "CryptoID" PrefixI True) (S1 (MetaSel (Just Symbol "ciphertext") NoSourceUnpackedness NoSourceStrictness DecidedLazy) (Rec0 a)))

data CryptoIDKey Source #

This newtype ensures only keys of the correct length can be created

Use genKey to securely generate keys.

Use the Binary instance to save and restore values of CryptoIDKey across executions.

Instances

Show CryptoIDKey Source #	Does not actually show any key material
Methods showsPrec :: Int -> CryptoIDKey -> ShowS # show :: CryptoIDKey -> String # showList :: [CryptoIDKey] -> ShowS #
Binary CryptoIDKey Source #
Methods put :: CryptoIDKey -> Put # get :: Get CryptoIDKey # putList :: [CryptoIDKey] -> Put #
ByteArrayAccess CryptoIDKey Source #
Methods length :: CryptoIDKey -> Int # withByteArray :: CryptoIDKey -> (Ptr p -> IO a) -> IO a #

genKey :: MonadIO m => m CryptoIDKey Source #

Securely generate a new key using system entropy

When CryptoCipher accepts keys of varying lengths this function generates a key of the largest accepted size.

readKeyFile :: MonadIO m => FilePath -> m CryptoIDKey Source #

Try to read a CryptoIDKey from a file. If the file does not exist, securely generate a key (using genKey) and save it to the file.

encrypt :: forall a m c namespace. (KnownSymbol namespace, MonadThrow m, Binary a) => (ByteString -> m c) -> CryptoIDKey -> a -> m (CryptoID namespace c) Source #

Encrypt a serialized value

decrypt :: forall a m c namespace. (KnownSymbol namespace, MonadThrow m, Binary a) => (c -> m ByteString) -> CryptoIDKey -> CryptoID namespace c -> m a Source #

Decrypt a serialized value

data CryptoIDError Source #

Error cases that can be encountered during encrypt and decrypt

Constructors

AlgorithmError CryptoError	One of the underlying cryptographic algorithms (`CryptoHash` or `CryptoCipher`) failed.
NamespaceHashIsWrongLength ByteString	The length of the digest produced by `CryptoHash` does not match the block size of `CryptoCipher`. The offending digest is included. This error should not occur and is included primarily for sake of totality.
CiphertextConversionFailed	The produced `ByteString` is the wrong length for conversion into a ciphertext.
DeserializationError (ByteString, ByteOffset, String)	The plaintext obtained by decrypting a ciphertext with the given `CryptoIDKey` in the context of the `namespace` could not be deserialized into a value of the expected `payload`-type. This is expected behaviour if the `namespace` or `payload`-type does not match the ones used during `encrypt`ion or if the `ciphertext` was tempered with.
InvalidNamespaceDetected	We have determined that, allthough deserializion succeded, the ciphertext was likely modified during transit or created using a different namespace.

Instances

Eq CryptoIDError Source #
Methods (==) :: CryptoIDError -> CryptoIDError -> Bool # (/=) :: CryptoIDError -> CryptoIDError -> Bool #
Show CryptoIDError Source #
Methods showsPrec :: Int -> CryptoIDError -> ShowS # show :: CryptoIDError -> String # showList :: [CryptoIDError] -> ShowS #
Exception CryptoIDError Source #
Methods toException :: CryptoIDError -> SomeException # fromException :: SomeException -> Maybe CryptoIDError # displayException :: CryptoIDError -> String #

type CryptoCipher = Blowfish Source #

The symmetric cipher BlockCipher this module uses

type CryptoHash = SHAKE128 64 Source #

The cryptographic HashAlgorithm this module uses

We expect the block size of CryptoCipher to be exactly the size of the Digest generated by CryptoHash (since a Digest is used as an IV).

Violation of this expectation causes runtime errors.