{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, DeriveGeneric, ForeignFunctionInterface #-}
-- |
-- Module      : Crypto.Saltine.Internal.OneTimeAuth
-- Copyright   : (c) Max Amanshauser 2021
-- License     : MIT
--
-- Maintainer  : max@lambdalifting.org
-- Stability   : experimental
-- Portability : non-portable
--
module Crypto.Saltine.Internal.OneTimeAuth (
    onetimeauth_bytes
  , onetimeauth_keybytes
  , c_onetimeauth
  , c_onetimeauth_verify
  , Key(..)
  , Authenticator(..)
) where


import Control.DeepSeq
import Crypto.Saltine.Class
import Crypto.Saltine.Core.Hash     (shorthash)
import Crypto.Saltine.Internal.Hash (nullShKey)
import Crypto.Saltine.Internal.Util as U
import Data.ByteString              (ByteString)
import Data.Data                    (Data, Typeable)
import Data.Hashable                (Hashable)
import Data.Monoid
import Foreign.C
import Foreign.Ptr
import GHC.Generics                 (Generic)

import qualified Data.ByteString as S

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  {-# INLINE encode #-}

-- | An opaque 'auth' authenticator.
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instance Show Authenticator where
    show :: Authenticator -> String
show Authenticator
k = String
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encode Authenticator
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  decode :: ByteString -> Maybe Authenticator
decode ByteString
v = if ByteString -> Int
S.length ByteString
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onetimeauth_bytes
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Au ByteString
v)
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forall a. Maybe a
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  encode :: Authenticator -> ByteString
encode (Au ByteString
v) = ByteString
v
  {-# INLINE encode #-}


onetimeauth_bytes, onetimeauth_keybytes :: Int

-- OneTimeAuth
-- | Size of a @crypto_onetimeauth@ authenticator.
onetimeauth_bytes :: Int
onetimeauth_bytes    = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_onetimeauth_bytes
-- | Size of a @crypto_onetimeauth@ authenticator key.
onetimeauth_keybytes :: Int
onetimeauth_keybytes = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_onetimeauth_keybytes

-- src/libsodium/crypto_onetimeauth/crypto_onetimeauth.c
foreign import ccall "crypto_onetimeauth_bytes"
  c_crypto_onetimeauth_bytes :: CSize
foreign import ccall "crypto_onetimeauth_keybytes"
  c_crypto_onetimeauth_keybytes :: CSize


foreign import ccall "crypto_onetimeauth"
  c_onetimeauth :: Ptr CChar
                -- ^ Authenticator output buffer
                -> Ptr CChar
                -- ^ Constant message buffer
                -> CULLong
                -- ^ Length of message buffer
                -> Ptr CChar
                -- ^ Constant key buffer
                -> IO CInt
                -- ^ Always 0

-- | We don't even include this in the IO monad since all of the
-- buffers are constant.
foreign import ccall "crypto_onetimeauth_verify"
  c_onetimeauth_verify :: Ptr CChar
                       -- ^ Constant authenticator buffer
                       -> Ptr CChar
                       -- ^ Constant message buffer
                       -> CULLong
                       -- ^ Length of message buffer
                       -> Ptr CChar
                       -- ^ Constant key buffer
                       -> CInt
                       -- ^ Success if 0, failure if -1