From 8fc0b121543b742f56f83c9eb74885e04d104778 Mon Sep 17 00:00:00 2001
From: Benjamin Barenblat <bbaren@google.com>
Date: Sat, 28 Apr 2018 14:49:07 -0700
Subject: Split low-level HMAC bindings into their own module

---
 src/Internal/Hmac.chs | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/Internal/Hmac.chs

(limited to 'src/Internal/Hmac.chs')

diff --git a/src/Internal/Hmac.chs b/src/Internal/Hmac.chs
new file mode 100644
index 0000000..69c474e
--- /dev/null
+++ b/src/Internal/Hmac.chs
@@ -0,0 +1,62 @@
+-- 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.Hmac
+  ( mallocHmacCtx
+  , hmacInitEx
+  , hmacUpdate
+  , hmacFinal
+  ) where
+
+import Foreign
+  (FinalizerPtr, ForeignPtr, Ptr, Storable(alignment, sizeOf),
+   addForeignPtrFinalizer, mallocForeignPtr, withForeignPtr)
+import Foreign.C.Types
+
+import Foreign.Ptr.Cast (asVoidPtr)
+{#import Internal.Base#}
+import Result
+
+#include <openssl/hmac.h>
+
+-- | Memory-safe allocator for 'HmacCtx'.
+mallocHmacCtx :: IO (ForeignPtr HmacCtx)
+mallocHmacCtx = do
+  fp <- mallocForeignPtr
+  withForeignPtr fp {#call HMAC_CTX_init as ^#}
+  addForeignPtrFinalizer hmacCtxCleanup fp
+  return fp
+
+foreign import ccall "&HMAC_CTX_cleanup"
+  hmacCtxCleanup :: FinalizerPtr HmacCtx
+
+hmacInitEx :: Ptr HmacCtx -> Ptr a -> CULong -> Ptr EvpMd -> Ptr Engine -> IO ()
+hmacInitEx ctx bytes size md engine =
+  requireSuccess $
+    {#call HMAC_Init_ex as ^#} ctx (asVoidPtr bytes) size md engine
+
+hmacUpdate :: Ptr HmacCtx -> Ptr CUChar -> CULong -> IO ()
+hmacUpdate ctx bytes size =
+  alwaysSucceeds $ {#call HMAC_Update as ^#} ctx bytes size
+
+hmacFinal :: Ptr HmacCtx -> Ptr CUChar -> Ptr CUInt -> IO ()
+hmacFinal ctx out outSize =
+  requireSuccess $ {#call HMAC_Final as ^#} ctx out outSize
+
+instance Storable HmacCtx where
+  sizeOf _ = {#sizeof HMAC_CTX#}
+  alignment _ = {#alignof HMAC_CTX#}
-- 
cgit v1.2.3