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-- Copyright 2017 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.Digest
( Algorithm
, Digest
, hash
, md5
, sha1
, sha224, sha256, sha384, sha512
) where
import qualified Data.ByteString.Lazy as ByteString.Lazy
import Foreign (withForeignPtr)
import Foreign.Marshal.Unsafe (unsafeLocalState)
import BTLS.BoringSSL.Base
import BTLS.BoringSSL.Digest
import BTLS.Buffer (onBufferOfMaxSize)
import BTLS.Types (Algorithm(Algorithm), Digest(Digest))
type LazyByteString = ByteString.Lazy.ByteString
md5, sha1, sha224, sha256, sha384, sha512 :: Algorithm
md5 = Algorithm evpMD5
sha1 = Algorithm evpSHA1
sha224 = Algorithm evpSHA224
sha256 = Algorithm evpSHA256
sha384 = Algorithm evpSHA384
sha512 = Algorithm evpSHA512
-- | Hashes according to the given 'Algorithm'.
hash :: Algorithm -> LazyByteString -> Digest
hash (Algorithm md) bytes =
unsafeLocalState $ do
ctxFP <- mallocEVPMDCtx
withForeignPtr ctxFP $ \ctx -> do
evpDigestInitEx ctx md noEngine
mapM_ (evpDigestUpdate ctx) (ByteString.Lazy.toChunks bytes)
Digest <$> onBufferOfMaxSize evpMaxMDSize (evpDigestFinalEx ctx)
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