92 lines
2.9 KiB
Haskell
92 lines
2.9 KiB
Haskell
-- |
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-- Module : Crypto.Hash.Internal.SHA3
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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 SHA3 bindings
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--
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{-# LANGUAGE ForeignFunctionInterface #-}
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module Crypto.Hash.Internal.SHA3
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( Ctx(..)
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-- * Internal values
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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 Foreign.Storable (peek)
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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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{- return the number of bytes of output for the digest -}
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peekHashlen :: Ptr Ctx -> IO Int
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peekHashlen ptr = peek iptr >>= \v -> return $! fromIntegral v
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where iptr :: Ptr Word32
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iptr = castPtr ptr
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{-# INLINE sizeCtx #-}
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sizeCtx :: Int
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sizeCtx = 360
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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 360 f
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foreign import ccall unsafe "cryptonite_sha3.h cryptonite_sha3_init"
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c_sha3_init :: Ptr Ctx -> Word32 -> IO ()
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foreign import ccall "cryptonite_sha3.h cryptonite_sha3_update"
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c_sha3_update :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_sha3.h cryptonite_sha3_update"
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c_sha3_update_unsafe :: Ptr Ctx -> Ptr Word8 -> Word32 -> IO ()
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foreign import ccall unsafe "cryptonite_sha3.h cryptonite_sha3_finalize"
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c_sha3_finalize :: Ptr Ctx -> Ptr Word8 -> IO ()
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internalInitAt :: Int -> Ptr Ctx -> IO ()
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internalInitAt hashlen ptr = c_sha3_init ptr (fromIntegral hashlen)
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-- | init a context
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internalInit :: Int -> IO Ctx
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internalInit hashlen = Ctx `fmap` bytesAlloc 360 (internalInitAt hashlen)
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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_sha3_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_sha3_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 =
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peekHashlen ptr >>= \digestSize -> create digestSize (c_sha3_finalize ptr)
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