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diff --git a/src/Internal/Digest.chs b/src/Internal/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 #-}
+{-# OPTIONS_GHC -Wno-orphans #-}
+
+module Internal.Digest where
+
+import Foreign (Storable(alignment, sizeOf))
+
+{#import Internal.Base#}
+
+#include <openssl/digest.h>
+
+instance Storable EvpMdCtx where
+  sizeOf _ = {#sizeof EVP_MD_CTX#}
+  alignment _ = {#alignof EVP_MD_CTX#}