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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.HMAC
( mallocHMACCtx
, hmacInitEx, hmacUpdate, hmacFinal
) where
import Data.ByteString (ByteString)
import Foreign (FinalizerPtr, ForeignPtr, Ptr, Storable(alignment, sizeOf))
import Foreign.C.Types
{#import BTLS.BoringSSL.Base#}
import BTLS.Buffer (unsafeUseAsCBuffer)
import BTLS.CreateWithFinalizer (createWithFinalizer)
import BTLS.Result
#include <openssl/hmac.h>
-- | Memory-safe allocator for 'HMACCtx'.
mallocHMACCtx :: IO (ForeignPtr HMACCtx)
mallocHMACCtx = createWithFinalizer {#call HMAC_CTX_init as ^#} hmacCtxCleanup
foreign import ccall "&HMAC_CTX_cleanup"
hmacCtxCleanup :: FinalizerPtr HMACCtx
{#fun HMAC_Init_ex as hmacInitEx
{`Ptr HMACCtx', unsafeUseAsCBuffer* `ByteString'&, `Ptr EVPMD', `Ptr Engine'}
-> `Int'#}
{#fun HMAC_Update as hmacUpdate
{`Ptr HMACCtx', unsafeUseAsCBuffer* `ByteString'&} -> `()' alwaysSucceeds*-#}
{#fun HMAC_Final as hmacFinal
{`Ptr HMACCtx', id `Ptr CUChar', id `Ptr CUInt'} -> `()' requireSuccess*-#}
instance Storable HMACCtx where
sizeOf _ = {#sizeof HMAC_CTX#}
alignment _ = {#alignof HMAC_CTX#}
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