{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, DeriveGeneric, ForeignFunctionInterface #-}
-- |
-- Module      : Crypto.Saltine.Internal.Auth
-- Copyright   : (c) Max Amanshauser 2021
-- License     : MIT
--
-- Maintainer  : max@lambdalifting.org
-- Stability   : experimental
-- Portability : non-portable
--
module Crypto.Saltine.Internal.Auth (
    auth_bytes
  , auth_keybytes
  , c_auth
  , c_auth_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 GHC.Generics                 (Generic)
import Foreign.C
import Foreign.Ptr

import qualified Data.ByteString as S

-- | An opaque 'auth' cryptographic key.
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-- | An opaque 'auth' authenticator.
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show Authenticator
k = String
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v = if ByteString -> Int
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auth_bytes
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  encode :: Authenticator -> ByteString
encode (Au ByteString
v) = ByteString
v
  {-# INLINE encode #-}


auth_bytes, auth_keybytes :: Int

-- Authentication
-- | Size of a @crypto_auth@ authenticator.
auth_bytes :: Int
auth_bytes    = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_auth_bytes
-- | Size of a @crypto_auth@ authenticator key.
auth_keybytes :: Int
auth_keybytes = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_auth_keybytes

-- src/libsodium/crypto_auth/crypto_auth.c
foreign import ccall "crypto_auth_bytes"
  c_crypto_auth_bytes :: CSize
foreign import ccall "crypto_auth_keybytes"
  c_crypto_auth_keybytes :: CSize

foreign import ccall "crypto_auth"
  c_auth :: 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_auth_verify"
  c_auth_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