[Hash] change Digest to use a foundation UArray that have configurable pinnable memory setting

Crypto/Hash/Types.hs

@@ -18,6 +18,8 @@ import           Crypto.Internal.Imports
 import           Crypto.Internal.ByteArray (ByteArrayAccess, Bytes)
 import qualified Crypto.Internal.ByteArray as B
 import           Foreign.Ptr (Ptr)
+import qualified Foundation.Array as F
+import qualified Foundation       as F
 
 -- | Class representing hashing algorithms.
 --
@@ -50,8 +52,11 @@ newtype Context a = Context Bytes
     deriving (ByteArrayAccess,NFData)
 
 -- | Represent a digest for a given hash algorithm.
-newtype Digest a = Digest Bytes
+newtype Digest a = Digest (F.UArray Word8)
-    deriving (Eq,Ord,ByteArrayAccess,NFData)
+    deriving (Eq,Ord,ByteArrayAccess)
+
+instance NFData (Digest a) where
+    rnf (Digest u) = u `F.deepseq` ()
 
 instance Show (Digest a) where
     show (Digest bs) = map (toEnum . fromIntegral)

cryptonite.cabal

@@ -220,7 +220,8 @@ Library
                      Crypto.Internal.Nat
   Build-depends:     base >= 4.3 && < 5
                    , bytestring
-                   , memory >= 0.12
+                   , memory >= 0.14.4
+                   , foundation >= 0.0.8
                    , ghc-prim
   ghc-options:       -Wall -fwarn-tabs -optc-O3 -fno-warn-unused-imports
   default-language:  Haskell2010