1 files changed, 45 insertions, 0 deletions
diff --git a/src/couch/src/couch_hash.erl b/src/couch/src/couch_hash.erl
new file mode 100644
index 000000000..842b37423
--- /dev/null
+++ b/src/couch/src/couch_hash.erl
@@ -0,0 +1,45 @@
+% 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
+%
+%   http://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(couch_hash).
+
+-export([md5_hash/1, md5_hash_final/1, md5_hash_init/0, md5_hash_update/2]).
+
+-ifdef(ERLANG_MD5).
+
+md5_hash(Data) ->
+    erlang:md5(Data).
+
+md5_hash_final(Context) ->
+    erlang:md5_final(Context).
+
+md5_hash_init() ->
+    erlang:md5_init().
+
+md5_hash_update(Context, Data) ->
+    erlang:md5_update(Context, Data).
+
+-else.
+
+md5_hash(Data) ->
+    crypto:hash(md5, Data).
+
+md5_hash_final(Context) ->
+    crypto:hash_final(Context).
+
+md5_hash_init() ->
+    crypto:hash_init(md5).
+
+md5_hash_update(Context, Data) ->
+    crypto:hash_update(Context, Data).
+
+-endif.