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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 #-}
{-# OPTIONS_GHC -Wno-orphans #-}
module Internal.Hmac
( mallocHmacCtx
, hmacInitEx
, hmacUpdate
, hmacFinal
) where
import Foreign
(FinalizerPtr, ForeignPtr, Ptr, Storable(alignment, sizeOf),
addForeignPtrFinalizer, mallocForeignPtr, withForeignPtr)
import Foreign.C.Types
import Foreign.Ptr.Cast (asVoidPtr)
{#import Internal.Base#}
import Result
#include <openssl/hmac.h>
-- | Memory-safe allocator for 'HmacCtx'.
mallocHmacCtx :: IO (ForeignPtr HmacCtx)
mallocHmacCtx = do
fp <- mallocForeignPtr
withForeignPtr fp {#call HMAC_CTX_init as ^#}
addForeignPtrFinalizer hmacCtxCleanup fp
return fp
foreign import ccall "&HMAC_CTX_cleanup"
hmacCtxCleanup :: FinalizerPtr HmacCtx
hmacInitEx :: Ptr HmacCtx -> Ptr a -> CULong -> Ptr EvpMd -> Ptr Engine -> IO ()
hmacInitEx ctx bytes size md engine =
requireSuccess $
{#call HMAC_Init_ex as ^#} ctx (asVoidPtr bytes) size md engine
hmacUpdate :: Ptr HmacCtx -> Ptr CUChar -> CULong -> IO ()
hmacUpdate ctx bytes size =
alwaysSucceeds $ {#call HMAC_Update as ^#} ctx bytes size
hmacFinal :: Ptr HmacCtx -> Ptr CUChar -> Ptr CUInt -> IO ()
hmacFinal ctx out outSize =
requireSuccess $ {#call HMAC_Final as ^#} ctx out outSize
instance Storable HmacCtx where
sizeOf _ = {#sizeof HMAC_CTX#}
alignment _ = {#alignof HMAC_CTX#}
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