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{-# LANGUAGE CApiFFI #-}
{-# OPTIONS_GHC -Wno-missing-methods #-}
module Data.Digest.Sha1
( sha1
) where
import Data.ByteString.Lazy (ByteString)
import Foreign (Ptr, Storable(alignment, sizeOf))
import Foreign.C.Types
import Data.Digest.Internal
#include <openssl/sha.h>
data ShaCtx
instance Storable ShaCtx where
sizeOf _ = #size SHA_CTX
alignment _ = #alignment SHA_CTX
foreign import capi "openssl/sha.h value SHA_DIGEST_LENGTH"
shaDigestLength :: CSize
foreign import ccall "openssl/sha.h SHA1_Init"
sha1Init :: Ptr ShaCtx -> IO CInt
foreign import ccall "openssl/sha.h SHA1_Update"
sha1Update :: Ptr ShaCtx -> Ptr a -> CSize -> IO CInt
foreign import ccall "openssl/sha.h SHA1_Final"
sha1Final :: Ptr CUChar -> Ptr ShaCtx -> IO CInt
sha1Algo :: Algo
sha1Algo = Algo shaDigestLength sha1Init sha1Update sha1Final
sha1 :: ByteString -> Digest
sha1 = hash sha1Algo
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