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authorJames Crayne <jim.crayne@gmail.com>2019-09-28 13:43:29 -0400
committerJoe Crayne <joe@jerkface.net>2020-01-01 19:27:53 -0500
commit11987749fc6e6d3e53ea737d46d5ab13a16faeb8 (patch)
tree5716463275c2d3e902889db619908ded2a73971c /cryptonite-backport/Crypto/Cipher/XSalsa.hs
parentadd2c76bced51fde5e9917e7449ef52be70faf87 (diff)
Factor out some new libraries
word64-map: Data.Word64Map network-addr: Network.Address tox-crypto: Crypto.Tox lifted-concurrent: Control.Concurrent.Lifted.Instrument Control.Concurrent.Async.Lifted.Instrument psq-wrap: Data.Wrapper.PSQInt Data.Wrapper.PSQ minmax-psq: Data.MinMaxPSQ tasks: Control.Concurrent.Tasks kad: Network.Kademlia Network.Kademlia.Bootstrap Network.Kademlia.Routing Network.Kademlia.CommonAPI Network.Kademlia.Persistence Network.Kademlia.Search
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diff --git a/cryptonite-backport/Crypto/Cipher/XSalsa.hs b/cryptonite-backport/Crypto/Cipher/XSalsa.hs
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1-- |
2-- Module : Crypto.Cipher.XSalsa
3-- License : BSD-style
4-- Maintainer : Brandon Hamilton <brandon.hamilton@gmail.com>
5-- Stability : stable
6-- Portability : good
7--
8-- Implementation of XSalsa20 algorithm
9-- <https://cr.yp.to/snuffle/xsalsa-20081128.pdf>
10-- Based on the Salsa20 algorithm with 256 bit key extended with 192 bit nonce
11
12{-# LANGUAGE ForeignFunctionInterface #-}
13module Crypto.Cipher.XSalsa
14 ( initialize
15 , combine
16 , generate
17 , State
18 ) where
19
20import Crypto.Internal.ByteArray (ByteArrayAccess, ByteArray, ScrubbedBytes)
21import qualified Crypto.Internal.ByteArray as B
22import Crypto.Internal.Compat
23import Crypto.Internal.Imports
24import Foreign.Ptr
25import Foreign.Storable
26import Foreign.C.Types
27import Crypto.Cipher.Salsa hiding (initialize)
28
29-- | Initialize a new XSalsa context with the number of rounds,
30-- the key and the nonce associated.
31initialize :: (ByteArrayAccess key, ByteArrayAccess nonce)
32 => Int -- ^ number of rounds (8,12,20)
33 -> key -- ^ the key (256 bits)
34 -> nonce -- ^ the nonce (192 bits)
35 -> State -- ^ the initial XSalsa state
36initialize nbRounds key nonce
37 | kLen /= 32 = error "XSalsa: key length should be 256 bits"
38 | nonceLen /= 24 = error "XSalsa: nonce length should be 192 bits"
39 | not (nbRounds `elem` [8,12,20]) = error "XSalsa: rounds should be 8, 12 or 20"
40 | otherwise = unsafeDoIO $ do
41 stPtr <- B.alloc 132 $ \stPtr ->
42 B.withByteArray nonce $ \noncePtr ->
43 B.withByteArray key $ \keyPtr ->
44 ccryptonite_xsalsa_init stPtr (fromIntegral nbRounds) kLen keyPtr nonceLen noncePtr
45 return $ State stPtr
46 where kLen = B.length key
47 nonceLen = B.length nonce
48
49foreign import ccall "cryptonite_xsalsa_init"
50 ccryptonite_xsalsa_init :: Ptr State -> Int -> Int -> Ptr Word8 -> Int -> Ptr Word8 -> IO ()