-- |
-- Module : Crypto.Hash.SHA256
-- License : BSD-style
-- Maintainer : Vincent Hanquez <vincent@snarc.org>
-- Stability : experimental
-- Portability : unknown
--
-- module containing the binding functions to work with the
-- SHA256 cryptographic hash.
--
{-# LANGUAGE ForeignFunctionInterface #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeFamilies #-}
module Crypto.Hash.SHA256 ( SHA256 (..) ) where
import Crypto.Hash.Types
import Foreign.Ptr (Ptr)
import Data.Data
import Data.Typeable
import Data.Word (Word8, Word32)
-- | SHA256 cryptographic hash algorithm
data SHA256 = SHA256
deriving (Show,Data,Typeable)
instance HashAlgorithm SHA256 where
type HashBlockSize SHA256 = 64
type HashDigestSize SHA256 = 32
type HashInternalContextSize SHA256 = 192
hashBlockSize _ = 64
hashDigestSize _ = 32
hashInternalContextSize _ = 192
hashInternalInit = c_sha256_init
hashInternalUpdate = c_sha256_update
hashInternalFinalize = c_sha256_finalize
foreign import ccall unsafe "cryptonite_sha256_init"
c_sha256_init :: Ptr (Context a)-> IO ()
foreign import ccall "cryptonite_sha256_update"
c_sha256_update :: Ptr (Context a) -> Ptr Word8 -> Word32 -> IO ()
foreign import ccall unsafe "cryptonite_sha256_finalize"
c_sha256_finalize :: Ptr (Context a) -> Ptr (Digest a) -> IO ()