    -- |
    -- Module      : Crypto.Hash.SHA3
    -- License     : BSD-style
    -- Maintainer  : Vincent Hanquez <vincent@snarc.org>
    -- Stability   : experimental
    -- Portability : unknown
    --
    -- module containing the binding functions to work with the
    -- SHA3 cryptographic hash.
    --
    {-# LANGUAGE ForeignFunctionInterface #-}
    {-# LANGUAGE DeriveDataTypeable #-}
    module Crypto.Hash.SHA3
        (  SHA3_224 (..), SHA3_256 (..), SHA3_384 (..), SHA3_512 (..)
        ) where

    import           Crypto.Hash.Types
    import           Foreign.Ptr (Ptr)
    import           Data.Data
    import           Data.Typeable
    import           Data.Word (Word8, Word32)

    -- | SHA3 (224 bits) cryptographic hash algorithm
    data SHA3_224 = SHA3_224
        deriving (Show,Data,Typeable)

    instance HashAlgorithm SHA3_224 where
        hashBlockSize  _          = 144
        hashDigestSize _          = 28
        hashInternalContextSize _ = 352
        hashInternalInit p        = c_sha3_init p 224
        hashInternalUpdate        = c_sha3_update
        hashInternalFinalize p    = c_sha3_finalize p 224

    -- | SHA3 (256 bits) cryptographic hash algorithm
    data SHA3_256 = SHA3_256
        deriving (Show,Data,Typeable)

    instance HashAlgorithm SHA3_256 where
        hashBlockSize  _          = 136
        hashDigestSize _          = 32
        hashInternalContextSize _ = 344
        hashInternalInit p        = c_sha3_init p 256
        hashInternalUpdate        = c_sha3_update
        hashInternalFinalize p    = c_sha3_finalize p 256

    -- | SHA3 (384 bits) cryptographic hash algorithm
    data SHA3_384 = SHA3_384
        deriving (Show,Data,Typeable)

    instance HashAlgorithm SHA3_384 where
        hashBlockSize  _          = 104
        hashDigestSize _          = 48
        hashInternalContextSize _ = 312
        hashInternalInit p        = c_sha3_init p 384
        hashInternalUpdate        = c_sha3_update
        hashInternalFinalize p    = c_sha3_finalize p 384

    -- | SHA3 (512 bits) cryptographic hash algorithm
    data SHA3_512 = SHA3_512
        deriving (Show,Data,Typeable)

    instance HashAlgorithm SHA3_512 where
        hashBlockSize  _          = 72
        hashDigestSize _          = 64
        hashInternalContextSize _ = 280
        hashInternalInit p        = c_sha3_init p 512
        hashInternalUpdate        = c_sha3_update
        hashInternalFinalize p    = c_sha3_finalize p 512

    foreign import ccall unsafe "cryptonite_sha3_init"
        c_sha3_init :: Ptr (Context a) -> Word32 -> IO ()

    foreign import ccall "cryptonite_sha3_update"
        c_sha3_update :: Ptr (Context a) -> Ptr Word8 -> Word32 -> IO ()

    foreign import ccall unsafe "cryptonite_sha3_finalize"
        c_sha3_finalize :: Ptr (Context a) -> Word32 -> Ptr (Digest a) -> IO ()