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diff --git a/src/BTLS/BoringSSL/Digest.chs b/src/BTLS/BoringSSL/Digest.chs
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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.Digest
+  ( evpMD5, evpSHA1, evpSHA224, evpSHA256, evpSHA384, evpSHA512
+  , mallocEVPMDCtx
+  , evpDigestInitEx, evpDigestUpdate, evpDigestFinalEx
+  , evpMaxMDSize
+  ) where
+
+import Foreign (FinalizerPtr, ForeignPtr, Ptr, Storable(alignment, sizeOf))
+import Foreign.C.Types
+
+{#import BTLS.BoringSSL.Base#}
+import BTLS.Cast (asVoidPtr)
+import BTLS.CreateWithFinalizer (createWithFinalizer)
+import BTLS.Result
+
+#include <openssl/digest.h>
+
+evpMD5, evpSHA1, evpSHA224, evpSHA256, evpSHA384, evpSHA512 :: Ptr EVPMD
+evpMD5    = {#call pure EVP_md5 as ^#}
+evpSHA1   = {#call pure EVP_sha1 as ^#}
+evpSHA224 = {#call pure EVP_sha224 as ^#}
+evpSHA256 = {#call pure EVP_sha256 as ^#}
+evpSHA384 = {#call pure EVP_sha384 as ^#}
+evpSHA512 = {#call pure EVP_sha512 as ^#}
+
+-- | Memory-safe allocator for 'EVPMDCtx'.
+mallocEVPMDCtx :: IO (ForeignPtr EVPMDCtx)
+mallocEVPMDCtx =
+  createWithFinalizer {#call EVP_MD_CTX_init as ^#} btlsFinalizeEVPMDCtxPtr
+
+foreign import ccall "&btlsFinalizeEVPMDCtx"
+  btlsFinalizeEVPMDCtxPtr :: FinalizerPtr EVPMDCtx
+
+evpDigestInitEx :: Ptr EVPMDCtx -> Ptr EVPMD -> Ptr Engine -> IO ()
+evpDigestInitEx ctx md engine =
+  requireSuccess $ {#call EVP_DigestInit_ex as ^#} ctx md engine
+
+evpDigestUpdate :: Ptr EVPMDCtx -> Ptr a -> CULong -> IO ()
+evpDigestUpdate ctx md bytes =
+  alwaysSucceeds $ {#call EVP_DigestUpdate as ^#} ctx (asVoidPtr md) bytes
+
+evpDigestFinalEx :: Ptr EVPMDCtx -> Ptr CUChar -> Ptr CUInt -> IO ()
+evpDigestFinalEx ctx mdOut outSize =
+  alwaysSucceeds $ {#call EVP_DigestFinal_ex as ^#} ctx mdOut outSize
+
+evpMaxMDSize :: Int
+evpMaxMDSize = {#const EVP_MAX_MD_SIZE#}
+
+instance Storable EVPMDCtx where
+  sizeOf _ = {#sizeof EVP_MD_CTX#}
+  alignment _ = {#alignof EVP_MD_CTX#}