89 lines
2.8 KiB
Haskell
89 lines
2.8 KiB
Haskell
-- |
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-- Module : Crypto.Hash.Internal.%%MODULENAME%%
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-- License : BSD-style
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-- Maintainer : Vincent Hanquez <vincent@snarc.org>
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-- Stability : experimental
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-- Portability : unknown
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--
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-- A module containing %%MODULENAME%% bindings
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--
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{-# LANGUAGE ForeignFunctionInterface #-}
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module Crypto.Hash.Internal.%%MODULENAME%%
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( Ctx(..)
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-- * Internal values
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, digestSize
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, sizeCtx
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-- * Internal IO hash functions
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, internalInit
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, internalInitAt
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, internalUpdate
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, internalUpdateUnsafe
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, internalFinalize
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-- * Context copy and creation
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, withCtxCopy
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, withCtxNewThrow
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, withCtxThrow
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) where
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import Foreign.Ptr
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import Data.ByteString (ByteString)
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import Data.ByteString.Unsafe (unsafeUseAsCStringLen)
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import Data.ByteString.Internal (create)
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import Data.Word
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import Crypto.Internal.Memory
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newtype Ctx = Ctx Bytes
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{-# INLINE digestSize #-}
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digestSize :: Int
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digestSize = %%DIGESTSIZE%%
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{-# INLINE sizeCtx #-}
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sizeCtx :: Int
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sizeCtx = %%SIZECTX%%
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withCtxCopy :: Ctx -> (Ptr Ctx -> IO ()) -> IO Ctx
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withCtxCopy (Ctx b) f = Ctx `fmap` bytesCopyAndModify b f
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withCtxThrow :: Ctx -> (Ptr Ctx -> IO a) -> IO a
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withCtxThrow (Ctx b) f = bytesCopyTemporary b f
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withCtxNewThrow :: (Ptr Ctx -> IO a) -> IO a
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withCtxNewThrow f = bytesTemporary %%SIZECTX%% f
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foreign import ccall unsafe "cryptonite_%%HEADER_FILE%% cryptonite_%%HASHNAME%%_init"
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c_%%HASHNAME%%_init :: Ptr Ctx -> IO ()
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foreign import ccall "cryptonite_%%HEADER_FILE%% cryptonite_%%HASHNAME%%_update"
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c_%%HASHNAME%%_update :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_%%HEADER_FILE%% cryptonite_%%HASHNAME%%_update"
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c_%%HASHNAME%%_update_unsafe :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_%%HEADER_FILE%% cryptonite_%%HASHNAME%%_finalize"
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c_%%HASHNAME%%_finalize :: Ptr Ctx -> Ptr Word8 -> IO ()
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internalInitAt :: Ptr Ctx -> IO ()
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internalInitAt = c_%%HASHNAME%%_init
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-- | init a context
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internalInit :: IO Ctx
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internalInit = Ctx `fmap` bytesAlloc %%SIZECTX%% internalInitAt
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-- | Update a context in place
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internalUpdate :: Ptr Ctx -> ByteString -> IO ()
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internalUpdate ptr d =
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unsafeUseAsCStringLen d (\(cs, len) -> c_%%HASHNAME%%_update ptr (castPtr cs) (fromIntegral len))
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-- | Update a context in place using an unsafe foreign function call.
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--
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-- It is faster than `internalUpdate`, but will block the haskell runtime.
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-- This shouldn't be used if the input data is large.
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internalUpdateUnsafe :: Ptr Ctx -> ByteString -> IO ()
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internalUpdateUnsafe ptr d =
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unsafeUseAsCStringLen d (\(cs, len) -> c_%%HASHNAME%%_update_unsafe ptr (castPtr cs) (fromIntegral len))
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-- | Finalize a context in place
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internalFinalize :: Ptr Ctx -> IO ByteString
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internalFinalize ptr = create digestSize (c_%%HASHNAME%%_finalize ptr)
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