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-- Copyright 2018 Google LLC
--
-- Licensed under the Apache License, Version 2.0 (the "License"); you may not
-- use this file except in compliance with the License. You may obtain a copy of
-- the License at
--
-- https://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-- License for the specific language governing permissions and limitations under
-- the License.
{-# OPTIONS_GHC -Wno-missing-methods #-}
module BTLS.BoringSSL.Cipher
( evpRC4
, mallocEVPCipherCtx
, evpCipherInitEx, evpCipherUpdate, evpCipherFinalEx
, evpCipherCtxSetKeyLength
, evpCipherNID, evpCipherBlockSize, evpCipherKeyLength, evpCipherIVLength
, CipherDirection(ReuseDirection, Decrypt, Encrypt)
) where
import Data.ByteString (ByteString)
import Foreign (FinalizerPtr, ForeignPtr, Ptr, Storable(alignment, sizeOf), withForeignPtr)
import Foreign.C.Types
{#import BTLS.BoringSSL.Base#}
import BTLS.Buffer (unsafeUseAsCBuffer)
import BTLS.CreateWithFinalizer (createWithFinalizer)
#include <openssl/cipher.h>
data CipherDirection = ReuseDirection | Decrypt | Encrypt
deriving (Eq, Show)
instance Enum CipherDirection where
fromEnum ReuseDirection = -1
fromEnum Decrypt = 0
fromEnum Encrypt = 1
{#fun pure EVP_rc4 as evpRC4 {} -> `Ptr EVPCipher'#}
-- | Memory-safe allocator for 'EVPCipherCtx'.
mallocEVPCipherCtx :: IO (ForeignPtr EVPCipherCtx)
mallocEVPCipherCtx =
createWithFinalizer {#call EVP_CIPHER_CTX_init as ^#} btlsFinalizeEVPCipherCtxPtr
foreign import ccall "&btlsFinalizeEVPCipherCtx"
btlsFinalizeEVPCipherCtxPtr :: FinalizerPtr EVPCipherCtx
{#fun EVP_CipherInit_ex as evpCipherInitEx
{ withForeignPtr* `ForeignPtr EVPCipherCtx'
, `Ptr EVPCipher'
, `Ptr Engine'
, id `Ptr CUChar'
, id `Ptr CUChar'
, 'fromIntegral . fromEnum' `CipherDirection'
} -> `Int'#}
{#fun EVP_CipherUpdate as evpCipherUpdate
{ withForeignPtr* `ForeignPtr EVPCipherCtx'
, id `Ptr CUChar'
, id `Ptr CInt'
, unsafeUseAsCBuffer* `ByteString'&
} -> `Int'#}
{#fun EVP_CipherFinal_ex as evpCipherFinalEx
{ withForeignPtr* `ForeignPtr EVPCipherCtx'
, id `Ptr CUChar'
, id `Ptr CInt'
} -> `Int'#}
{#fun EVP_CIPHER_CTX_set_key_length as evpCipherCtxSetKeyLength
{withForeignPtr* `ForeignPtr EVPCipherCtx', `Int'} -> `Int'#}
{#fun pure EVP_CIPHER_nid as evpCipherNID {`Ptr EVPCipher'} -> `Int'#}
{#fun pure EVP_CIPHER_block_size as evpCipherBlockSize
{`Ptr EVPCipher'} -> `Int'#}
{#fun pure EVP_CIPHER_key_length as evpCipherKeyLength
{`Ptr EVPCipher'} -> `Int'#}
{#fun pure EVP_CIPHER_iv_length as evpCipherIVLength
{`Ptr EVPCipher'} -> `Int'#}
instance Storable EVPCipherCtx where
sizeOf _ = {#sizeof EVP_CIPHER_CTX#}
alignment _ = {#alignof EVP_CIPHER_CTX#}
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