-- |
-- 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.Word (Word8, Word32)

-- | SHA256 cryptographic hash algorithm
data SHA256 = SHA256
    deriving (Int -> SHA256 -> ShowS
[SHA256] -> ShowS
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instance HashAlgorithm SHA256 where
    type HashBlockSize           SHA256 = 64
    type HashDigestSize          SHA256 = 32
    type HashInternalContextSize SHA256 = 192
    hashBlockSize :: SHA256 -> Int
hashBlockSize  SHA256
_          = Int
64
    hashDigestSize :: SHA256 -> Int
hashDigestSize SHA256
_          = Int
32
    hashInternalContextSize :: SHA256 -> Int
hashInternalContextSize SHA256
_ = Int
192
    hashInternalInit :: Ptr (Context SHA256) -> IO ()
hashInternalInit          = forall a. Ptr (Context a) -> IO ()
c_sha256_init
    hashInternalUpdate :: Ptr (Context SHA256) -> Ptr Word8 -> Word32 -> IO ()
hashInternalUpdate        = forall a. Ptr (Context a) -> Ptr Word8 -> Word32 -> IO ()
c_sha256_update
    hashInternalFinalize :: Ptr (Context SHA256) -> Ptr (Digest SHA256) -> IO ()
hashInternalFinalize      = forall a. Ptr (Context a) -> Ptr (Digest a) -> IO ()
c_sha256_finalize

instance HashAlgorithmPrefix SHA256 where
    hashInternalFinalizePrefix :: Ptr (Context SHA256)
-> Ptr Word8 -> Word32 -> Word32 -> Ptr (Digest SHA256) -> IO ()
hashInternalFinalizePrefix = forall a.
Ptr (Context a)
-> Ptr Word8 -> Word32 -> Word32 -> Ptr (Digest a) -> IO ()
c_sha256_finalize_prefix

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 ()

foreign import ccall "cryptonite_sha256_finalize_prefix"
    c_sha256_finalize_prefix :: Ptr (Context a) -> Ptr Word8 -> Word32 -> Word32 -> Ptr (Digest a) -> IO ()