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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.
module Data.HMAC
( SecretKey(SecretKey)
, HMAC
, hmac
) where
import Data.ByteString (ByteString)
import qualified Data.ByteString.Lazy as ByteString.Lazy
import qualified Data.ByteString.Unsafe as ByteString
import Foreign.Marshal.Unsafe (unsafeLocalState)
import BTLS.BoringSSL.Base
import BTLS.BoringSSL.HMAC
import BTLS.BoringSSL.Mem (cryptoMemcmp)
import BTLS.BoringSSLPatterns (initUpdateFinalize)
import BTLS.Buffer (unsafeUseAsCUStringLen)
import BTLS.Types (Algorithm(Algorithm), Digest(Digest), SecretKey(SecretKey))
type LazyByteString = ByteString.Lazy.ByteString
-- | A hash-based message authentication code. Equality comparisons on this type
-- are constant-time.
newtype HMAC = HMAC ByteString
instance Eq HMAC where
(HMAC a) == (HMAC b) =
unsafeLocalState $
ByteString.unsafeUseAsCStringLen a $ \(a', size) ->
ByteString.unsafeUseAsCStringLen b $ \(b', _) ->
cryptoMemcmp a' b' size
instance Show HMAC where
show (HMAC m) = show (Digest m)
-- | Creates an HMAC according to the given 'Algorithm'.
hmac :: Algorithm -> SecretKey -> LazyByteString -> HMAC
hmac (Algorithm md) (SecretKey key) =
HMAC
. unsafeLocalState
. initUpdateFinalize mallocHMACCtx initialize hmacUpdate hmacFinal
where
initialize ctx =
unsafeUseAsCUStringLen key $ \(keyBytes, keySize) ->
hmacInitEx ctx keyBytes keySize md noEngine
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