    {-# LANGUAGE ForeignFunctionInterface   #-}
    -- | The portable C-implementation of SHA512
    module Raaz.Hash.Sha512.Implementation.CPortable
           ( implementation, cPortable
           ) where

    import Foreign.Ptr                ( Ptr )
    import Raaz.Core
    import Raaz.Hash.Internal
    import Raaz.Hash.Sha.Util
    import Raaz.Hash.Sha512.Internal

    -- | The portable C implementation of SHA512.
    implementation :: Implementation SHA512
    implementation :: Implementation SHA512
    implementation =  HashI SHA512 (HashMemory SHA512) -> SomeHashI SHA512
    forall h m. HashM h m => HashI h m -> SomeHashI h
    SomeHashI HashI SHA512 (HashMemory SHA512)
    cPortable

    -- | The Hash implementation, i.e. `HashI` associated with the
    -- portable C implementation for the hash SHA512. This can be used
    -- to implement truncated implementation like SHA384.
    cPortable :: HashI SHA512 (HashMemory SHA512)
    cPortable :: HashI SHA512 (HashMemory SHA512)
    cPortable = String
    -> String
    -> Compressor SHA512
    -> LengthWrite SHA512
    -> HashI SHA512 (HashMemory SHA512)
    forall h.
    IsSha h =>
    String
    -> String
    -> Compressor h
    -> LengthWrite h
    -> HashI h (HashMemory h)
    shaImplementation
                "sha512-cportable"
                "Sha512 Implementation using portable C and Haskell FFI"
                Compressor SHA512
    c_sha512_compress LengthWrite SHA512
    forall h. LengthWrite h
    length128Write

    foreign import ccall unsafe
      "raaz/hash/sha512/portable.h raazHashSha512PortableCompress"
      c_sha512_compress  :: Pointer -> Int -> Ptr SHA512 -> IO ()