{-# LANGUAGE DeriveDataTypeable, GeneralizedNewtypeDeriving, DeriveGeneric, ForeignFunctionInterface #-}
-- |
-- Module      : Crypto.Saltine.Internal.AEAD.AES256GCM
-- Copyright   : (c) Max Amanshauser 2021
-- License     : MIT
--
-- Maintainer  : max@lambdalifting.org
-- Stability   : experimental
-- Portability : non-portable
--
module Crypto.Saltine.Internal.AEAD.AES256GCM (
    aead_aes256gcm_keybytes
  , aead_aes256gcm_npubbytes
  , aead_aes256gcm_abytes
  , c_aead_aes256gcm_is_available
  , c_aead
  , c_aead_open
  , c_aead_detached
  , c_aead_open_detached
  , Key(..)
  , Nonce(..)
) 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 'AES256GCM' cryptographic key.
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  {-# INLINE encode #-}

-- | An opaque 'AES256GCM' nonce.
newtype Nonce = Nonce { Nonce -> ByteString
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instance Show Nonce where
    show :: Nonce -> String
show Nonce
k = String
"AEAD.AES256GCM.Nonce " String -> ShowS
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<> ByteString -> String
bin2hex (Nonce -> ByteString
forall a. IsEncoding a => a -> ByteString
encode Nonce
k)

instance IsEncoding Nonce where
  decode :: ByteString -> Maybe Nonce
decode ByteString
v = if ByteString -> Int
S.length ByteString
v Int -> Int -> Bool
forall a. Eq a => a -> a -> Bool
== Int
aead_aes256gcm_npubbytes
           then Nonce -> Maybe Nonce
forall a. a -> Maybe a
Just (ByteString -> Nonce
Nonce ByteString
v)
           else Maybe Nonce
forall a. Maybe a
Nothing
  {-# INLINE decode #-}
  encode :: Nonce -> ByteString
encode (Nonce ByteString
v) = ByteString
v
  {-# INLINE encode #-}

instance IsNonce Nonce where
  zero :: Nonce
zero            = ByteString -> Nonce
Nonce (Int -> Word8 -> ByteString
S.replicate Int
aead_aes256gcm_npubbytes Word8
0)
  nudge :: Nonce -> Nonce
nudge (Nonce ByteString
n) = ByteString -> Nonce
Nonce (ByteString -> ByteString
nudgeBS ByteString
n)


aead_aes256gcm_keybytes, aead_aes256gcm_abytes, aead_aes256gcm_npubbytes :: Int

-- | Size of an AES256 key
aead_aes256gcm_keybytes :: Int
aead_aes256gcm_keybytes  = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_aead_aes256gcm_keybytes
-- | Size of an AES256 nonce
aead_aes256gcm_npubbytes :: Int
aead_aes256gcm_npubbytes = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_aead_aes256gcm_npubbytes
-- | Size of an AES256 authentication tag
aead_aes256gcm_abytes :: Int
aead_aes256gcm_abytes    = CSize -> Int
forall a b. (Integral a, Num b) => a -> b
fromIntegral CSize
c_crypto_aead_aes256gcm_abytes


-- src/libsodium/crypto_aead/aes256gcm/sodium/aead_aes256gcm.c
-- src/libsodium/include/sodium/crypto_aead_aes256gcm.h
foreign import ccall "crypto_aead_aes256gcm_keybytes"
    c_crypto_aead_aes256gcm_keybytes :: CSize
foreign import ccall "crypto_aead_aes256gcm_npubbytes"
    c_crypto_aead_aes256gcm_npubbytes:: CSize
foreign import ccall "crypto_aead_aes256gcm_abytes"
    c_crypto_aead_aes256gcm_abytes :: CSize


foreign import ccall "crypto_aead_aes256gcm_is_available"
  c_aead_aes256gcm_is_available
    :: IO CInt

-- | The aead C API uses C strings. Always returns 0.
foreign import ccall "crypto_aead_aes256gcm_encrypt"
  c_aead
    :: Ptr CChar
    -- ^ Cipher output buffer
    -> Ptr CULLong
    -- ^ Cipher output bytes used
    -> Ptr CChar
    -- ^ Constant message input buffer
    -> CULLong
    -- ^ Length of message input buffer
    -> Ptr CChar
    -- ^ Constant aad input buffer
    -> CULLong
    -- ^ Length of aad input buffer
    -> Ptr CChar
    -- ^ Unused 'nsec' value (must be NULL)
    -> Ptr CChar
    -- ^ Constant nonce buffer
    -> Ptr CChar
    -- ^ Constant key buffer
    -> IO CInt

-- | The aead open C API uses C strings. Returns 0 if successful.
foreign import ccall "crypto_aead_aes256gcm_decrypt"
  c_aead_open
    :: Ptr CChar
    -- ^ Message output buffer
    -> Ptr CULLong
    -- ^ Message output bytes used
    -> Ptr CChar
    -- ^ Unused 'nsec' value (must be NULL)
    -> Ptr CChar
    -- ^ Constant ciphertext input buffer
    -> CULLong
    -- ^ Length of ciphertext input buffer
    -> Ptr CChar
    -- ^ Constant aad input buffer
    -> CULLong
    -- ^ Length of aad input buffer
    -> Ptr CChar
    -- ^ Constant nonce buffer
    -> Ptr CChar
    -- ^ Constant key buffer
    -> IO CInt

-- | The aead C API uses C strings. Always returns 0.
foreign import ccall "crypto_aead_aes256gcm_encrypt_detached"
  c_aead_detached
    :: Ptr CChar
    -- ^ Cipher output buffer
    -> Ptr CChar
    -- ^ Tag output buffer
    -> Ptr CULLong
    -- ^ Tag bytes used
    -> Ptr CChar
    -- ^ Constant message input buffer
    -> CULLong
    -- ^ Length of message input buffer
    -> Ptr CChar
    -- ^ Constant aad input buffer
    -> CULLong
    -- ^ Length of aad input buffer
    -> Ptr CChar
    -- ^ Unused 'nsec' value (must be NULL)
    -> Ptr CChar
    -- ^ Constant nonce buffer
    -> Ptr CChar
    -- ^ Constant key buffer
    -> IO CInt

-- | The aead open C API uses C strings. Returns 0 if successful.
foreign import ccall "crypto_aead_aes256gcm_decrypt_detached"
  c_aead_open_detached
    :: Ptr CChar
    -- ^ Message output buffer
    -> Ptr CChar
    -- ^ Unused 'nsec' value (must be NULL)
    -> Ptr CChar
    -- ^ Constant ciphertext input buffer
    -> CULLong
    -- ^ Length of ciphertext input buffer
    -> Ptr CChar
    -- ^ Constant tag input buffer
    -> Ptr CChar
    -- ^ Constant aad input buffer
    -> CULLong
    -- ^ Length of aad input buffer
    -> Ptr CChar
    -- ^ Constant nonce buffer
    -> Ptr CChar
    -- ^ Constant key buffer
    -> IO CInt