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|
-- |
-- Module : Data.Memory.Hash.SipHash
-- License : BSD-style
-- Maintainer : Vincent Hanquez <vincent@snarc.org>
-- Stability : experimental
-- Portability : good
--
-- provide the SipHash algorithm.
-- reference: <http://131002.net/siphash/siphash.pdf>
--
{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE DeriveDataTypeable #-}
module Data.Memory.Hash.SipHash
( SipKey(..)
, SipHash(..)
, hash
, hashWith
) where
import Data.Memory.Endian
import Data.Memory.Internal.Compat
import Data.Word
import Data.Bits
import Data.Typeable (Typeable)
import Control.Monad
import Foreign.Ptr
import Foreign.Storable
-- | SigHash Key
data SipKey = SipKey {-# UNPACK #-} !Word64 {-# UNPACK #-} !Word64
-- | Siphash tag value
newtype SipHash = SipHash Word64
deriving (Show,Eq,Ord,Typeable)
data InternalState = InternalState {-# UNPACK #-} !Word64 {-# UNPACK #-} !Word64 {-# UNPACK #-} !Word64 {-# UNPACK #-} !Word64
-- | produce a siphash with a key and a memory pointer + length.
hash :: SipKey -> Ptr Word8 -> Int -> IO SipHash
hash = hashWith 2 4
-- | same as 'hash', except also specifies the number of sipround iterations for compression and digest.
hashWith :: Int -- ^ siphash C
-> Int -- ^ siphash D
-> SipKey -- ^ key for the hash
-> Ptr Word8 -- ^ memory pointer
-> Int -- ^ length of the data
-> IO SipHash
hashWith c d key startPtr totalLen = runHash (initSip key) startPtr totalLen
where runHash !st !ptr l
| l > 7 = peek (castPtr ptr) >>= \v -> runHash (process st (fromLE v)) (ptr `plusPtr` 8) (l-8)
| otherwise = do
let !lengthBlock = (fromIntegral totalLen `mod` 256) `unsafeShiftL` 56
(finish . process st) `fmap` case l of
0 -> do return lengthBlock
1 -> do v0 <- peekByteOff ptr 0
return (lengthBlock .|. to64 v0)
2 -> do (v0,v1) <- liftM2 (,) (peekByteOff ptr 0) (peekByteOff ptr 1)
return (lengthBlock
.|. (to64 v1 `unsafeShiftL` 8)
.|. to64 v0)
3 -> do (v0,v1,v2) <- liftM3 (,,) (peekByteOff ptr 0) (peekByteOff ptr 1) (peekByteOff ptr 2)
return ( lengthBlock
.|. (to64 v2 `unsafeShiftL` 16)
.|. (to64 v1 `unsafeShiftL` 8)
.|. to64 v0)
4 -> do (v0,v1,v2,v3) <- liftM4 (,,,) (peekByteOff ptr 0) (peekByteOff ptr 1) (peekByteOff ptr 2)
(peekByteOff ptr 3)
return ( lengthBlock
.|. (to64 v3 `unsafeShiftL` 24)
.|. (to64 v2 `unsafeShiftL` 16)
.|. (to64 v1 `unsafeShiftL` 8)
.|. to64 v0)
5 -> do (v0,v1,v2,v3,v4) <- liftM5 (,,,,) (peekByteOff ptr 0) (peekByteOff ptr 1) (peekByteOff ptr 2)
(peekByteOff ptr 3) (peekByteOff ptr 4)
return ( lengthBlock
.|. (to64 v4 `unsafeShiftL` 32)
.|. (to64 v3 `unsafeShiftL` 24)
.|. (to64 v2 `unsafeShiftL` 16)
.|. (to64 v1 `unsafeShiftL` 8)
.|. to64 v0)
6 -> do v0 <- peekByteOff ptr 0
v1 <- peekByteOff ptr 1
v2 <- peekByteOff ptr 2
v3 <- peekByteOff ptr 3
v4 <- peekByteOff ptr 4
v5 <- peekByteOff ptr 5
return ( lengthBlock
.|. (to64 v5 `unsafeShiftL` 40)
.|. (to64 v4 `unsafeShiftL` 32)
.|. (to64 v3 `unsafeShiftL` 24)
.|. (to64 v2 `unsafeShiftL` 16)
.|. (to64 v1 `unsafeShiftL` 8)
.|. to64 v0)
7 -> do v0 <- peekByteOff ptr 0
v1 <- peekByteOff ptr 1
v2 <- peekByteOff ptr 2
v3 <- peekByteOff ptr 3
v4 <- peekByteOff ptr 4
v5 <- peekByteOff ptr 5
v6 <- peekByteOff ptr 6
return ( lengthBlock
.|. (to64 v6 `unsafeShiftL` 48)
.|. (to64 v5 `unsafeShiftL` 40)
.|. (to64 v4 `unsafeShiftL` 32)
.|. (to64 v3 `unsafeShiftL` 24)
.|. (to64 v2 `unsafeShiftL` 16)
.|. (to64 v1 `unsafeShiftL` 8)
.|. to64 v0)
_ -> error "siphash: internal error: cannot happens"
{-# INLINE to64 #-}
to64 :: Word8 -> Word64
to64 = fromIntegral
{-# INLINE process #-}
process istate m = newState
where newState = postInject $! runRoundsCompression $! preInject istate
preInject (InternalState v0 v1 v2 v3) = InternalState v0 v1 v2 (v3 `xor` m)
postInject (InternalState v0 v1 v2 v3) = InternalState (v0 `xor` m) v1 v2 v3
{-# INLINE finish #-}
finish istate = getDigest $! runRoundsDigest $! preInject istate
where getDigest (InternalState v0 v1 v2 v3) = SipHash (v0 `xor` v1 `xor` v2 `xor` v3)
preInject (InternalState v0 v1 v2 v3) = InternalState v0 v1 (v2 `xor` 0xff) v3
{-# INLINE doRound #-}
doRound (InternalState v0 v1 v2 v3) =
let !v0' = v0 + v1
!v2' = v2 + v3
!v1' = v1 `rotateL` 13
!v3' = v3 `rotateL` 16
!v1'' = v1' `xor` v0'
!v3'' = v3' `xor` v2'
!v0'' = v0' `rotateL` 32
!v2'' = v2' + v1''
!v0''' = v0'' + v3''
!v1''' = v1'' `rotateL` 17
!v3''' = v3'' `rotateL` 21
!v1'''' = v1''' `xor` v2''
!v3'''' = v3''' `xor` v0'''
!v2''' = v2'' `rotateL` 32
in InternalState v0''' v1'''' v2''' v3''''
{-# INLINE runRoundsCompression #-}
runRoundsCompression st
| c == 2 = doRound $! doRound st
| otherwise = loopRounds c st
{-# INLINE runRoundsDigest #-}
runRoundsDigest st
| d == 4 = doRound $! doRound $! doRound $! doRound st
| otherwise = loopRounds d st
{-# INLINE loopRounds #-}
loopRounds 1 !v = doRound v
loopRounds n !v = loopRounds (n-1) (doRound v)
{-# INLINE initSip #-}
initSip (SipKey k0 k1) = InternalState (k0 `xor` 0x736f6d6570736575)
(k1 `xor` 0x646f72616e646f6d)
(k0 `xor` 0x6c7967656e657261)
(k1 `xor` 0x7465646279746573)
|
